Consulta: subjectFacets:"Wastewater"
Registros recuperados: 47
Data/hora: 07/06/2024 01:49:31

Variaciones iónicas en las aguas residuales del Valle del Mezquital.
Provedor de dados: 32
Autores: Cuéllar Carrasco, Edwin.
En México, se riegan con aguas residuales aproximadamente 200,000 ha en diferentes valles intermontanos en la zona del Mezquital. Las aguas residuales utilizadas en el Valle del Mezquital no han recibido ningún tratamiento. Debido al tamaño del área de cultivo de 80,000 ha con antigüedad de 97 años en operación continua, la región es un ejemplo de uso de aguas residuales para riego, que derivan de la zona metropolitana del Valle de México. El Valle del Mezquital se localiza dentro del límite suroeste del estado de Hidalgo (latitud norte 20° 02 ́ y longitud oeste 99° 15 ́). Está situado en lo alto de la meseta mexicana, a 60 km de la ciudad de México con una altitud entre 1,640 m y 2,400 msnm. Está conformado por 27 municipios de los 84 que conforman el...
Palavras-chave: Aguas residuales; Salinidad; Sodicidad; Conductividad eléctrica; RAS; Wastewater; Salinity; Sodicity; Electrical conductivity; Sodium adsorbed; Relationship; Hidrociencias; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2180

Manejo y uso de biosólidos en suelos agrícolas
Provedor de dados: 32
Autores: Robledo Santoyo, Edmundo.
Como subproducto del tratamiento de las aguas residuales de la ciudad de Aguascalientes, Ags., en la Planta de Tratamiento “El Niágara”, se generan diariamente de 150 a 170 m3 de biosólidos. Estos materiales son aplicados a suelos agrícolas de áreas cercanas a la planta, sin regulación alguna, por lo que se han obtenido buenos resultados o causado quemaduras en plántulas o endurecimiento de suelos. El objetivo de este proyecto fue generar estrategias para la disposición y aprovechamiento de los biosólidos para mejorar suelos agrícolas y la calidad y rendimiento de los cultivos, sin perjuicio para el ambiente. Para determinar el efecto de los biosólidos sobre suelos y plantas, se colectaron muestras de los biosólidos y se tomaron muestras de tres tipos de...
Palavras-chave: Aguas residuales; Metales pesados; Contaminación; Mejoradores del suelo; Wastewater; Heavy metals; Contamination; Soil amendments; Edafología; Doctorado.
Ano: 2012
URL: http://hdl.handle.net/10521/1733

Factibilidad económica para el aprovechamiento de aguas tratadas de PTAR Atapaneo en módulos II al IV del DR020 Morelia-Queréndaro utilizando SIG.
Provedor de dados: 32
Autores: Gaona Quesada, Rafael.
Existe una planta de tratamiento de aguas residuales (PTAR) en el río Grande de Morelia que tiene una capacidad para 2.19 m3s-1, cuya agua tratada se mezcla con el agua del río proveniente de la presa y luego se conduce para irrigar las superficies de los módulos II, III y IV del Distrito de Riego 020 Morelia-Queréndaro, Michoacán. Los usuarios de estos módulos, tienen concesión para usar tanto el agua del río proveniente de la presa así como para usar el agua residual de la ciudad de Morelia. En este trabajo se evalúa la factibilidad económica de entubar el agua proveniente de la PTAR y llevarla hasta el punto de control de cada uno de los módulos. Con el proyecto se podrá evitar la mezcla de aguas residuales con agua proveniente de la presa y de tener...
Palavras-chave: Aguas residuales; Diseño hidráulico; Indicadores económicos; Wastewater; Hydraulic design; Economic indicators; Hidrociencias; Maestría Tecnológica.
Ano: 2013
URL: http://hdl.handle.net/10521/2067

The notion of sewage as waste: a study of infrastructure change and institutional inertia in Buenos Aires, Argentina and Vancouver, Canada
Provedor de dados: 7
Autores: Merlinsky, Maria G.; University of Buenos Aires; merlinsk@retina.ar; LaValle, Alicia; University of British Columbia; av_lavalle@yahoo.com; Morales, Margaret; University of British Columbia; margaret.c.morales@gmail.com; Tobias, Melina M.; University of Buenos Aires; melina.tobias@gmail.com.
The need for a radical shift to more iterative and adaptive solutions in sewage management is increasingly recognized, but our ability to achieve such a shift is constrained by inertia to change. Here, we describe planning in two metropolitan areas that are upgrading their sewage systems, based on interviews with central actors and official documents. Using new institutionalism and concentrating on changes in normative, regulative, and cognitive patterns, we analyze if obstacles to the uptake of innovations can be understood in light of how these patterns counteract institutional change. Our aim is to understand obstacles to reformers implementing a wider vision of sewage management. Our study suggests that even though both Buenos Aires and Vancouver...
Tipo: Peer-Reviewed article
Palavras-chave: Inertia to change; Sewage management; Waste vs. resource; Wastewater; Water management.
Ano: 2014

Cultivation of Scenedesmus dimorphus for C/N/P removal and lipid production
Provedor de dados: 69
Autores: Xu,Xinmiao; Shen,Ying; Chen,Jiacheng.
Background CO2 emission, water pollution and petroleum shortage are the issues coming with the development of industry. A cost effective system was constructed to fix the CO2 in flue gas (15% CO2), remove nitrogen and phosphorus from manure wastewater and produce biofuels at the same time. The significant cultivation conditions were selected by Plackett-Burman design, and then optimized with central composite design. Results Optimum culture condition was predicted at light intensity of 238 µmol·m- 2·s- 1, TN of 152 mg·L- 1, inoculum density of 0.3 g·L- 1, under which the measured CO2 fixation rate, total nitrogen and phosphorus removing rate, and lipid content were 638.13 mg·L- 1·d- 1, 88.16%, 73.98% and 11.9%, respectively. The lipid content was then...
Tipo: Journal article
Palavras-chave: CO2 fixation rate; Flue gas; Lipid content; Scenedesmus dimorphus; Wastewater.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000100009

Heavy metal uptake by agro based waste materials
Provedor de dados: 69
Autores: Qaiser,Suleman; Saleemi,Anwar R; Mahmood Ahmad,Muhammad.
Presence of heavy metals in the aquatic systems has become a serious problem. As a result, there has been a great deal of attention given to new technologies for removal of heavy metal ions from contaminated waters. Biosorption is one such emerging technology which utilized naturally occurring waste materials to sequester heavy metals from industrial wastewater. The aim of the present study was to utilize the locally available agricultural waste materials for heavy metal removal from industrial wastewater. The wastewater containing lead and hexavalent chromium was treated with biomass prepared from ficus religiosa leaves. It was fund that a time of one hr was sufficient for sorption to attain equilibrium. The equilibrium sorption capacity after one hr was...
Tipo: Journal article
Palavras-chave: Biosorption; Ficus religiosa leaves; Hexavalent chromium; Kinetics; Lead; Wastewater.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300008

PERCOLATE QUALITY IN SOIL CULTIVATED WITH APPLICATION OF WASTEWATER FROM SWINE SLAUGHTERHOUSE AND DAIRY PRODUCTS
Provedor de dados: 70
Autores: Oliveira,Jacineumo F. de; Rodrigues,Fernando N.; Fia,Ronaldo; Mafra,Dayana C. B.; Landim,Daniela V.
ABSTRACT The objective of this study was to evaluate the quality of the percolate in soil columns cultivated with Tiffon-grass 85 under different wastewater rates from swine slaughterhouse and dairy. The experiment was conducted at the Department of Engineering at the Federal University of Lavras, in PVC columns with 0.30 m of diameter and 1.2 m deep, filled with Dark Red Latosol cultivated with Tifton-grass 85. The treatments consisted of a (AQT0) control with recommended chemical fertilization for Tifton-grass 85 (300 kg ha-1 year-1 of N), and four doses of SSW and DPW (100, 200, 300 and 400% of the recommendation) in a CRD with 3 replications. The samples of percolated were collected and characterized weekly. The treatments of highest dosage have...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water reuse; Wastewater; Leaching; Soil disposal; Agroindustry wastewaters.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601222

Wet bulbs from the subsurface drip irrigation with water supply and treated sewage effluent
Provedor de dados: 70
Autores: ELAIUY,MARCELO L. C.; SANTOS,LEONARDO N. S. DOS; SOUSA,ALLAN C. M. DE; SOUZA,CLAUDINEI F.; MATSURA​,EDSON E.
The use of treated sewage effluent (TSE) combined with the subsurface drip irrigation (SDI) method in agriculture can decrease the costs of agricultural production, in attempts to fertigate crops more efficiently. In this study it was compared the dimensions of the wet bulb formed by the application of TSE and municipal water supply (MWS) in an Oxisoil. We have evaluated the effect of water quality and discharge between drippers used in sugarcane crop. Three trenches were opened and 21 three-rod TDR probes were setup in a mesh and a dripper was buried at 0.30 m, for each constant discharge of 1.0 L h-1and 1.6 L h-1. Comparing results from different wetted soil profiles it was observed that the vertical and horizontal dimensions of the wet bulb are similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisoil; Wastewater; TDR; Water content; Electrical conductivity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000200242

EFFECT OF AERATION AND RECIRCULATION IN THE REMOVAL OF NITROGEN AND CHEMICAL OXYGEN DEMAND FROM SANITARY SEWAGE IN A STRUCTURED BED REACTOR
Provedor de dados: 70
Autores: Leick,Sheilla A.; Oliveira,João G B. De; Tavares,Karoline A.; Lopes,Deize D.; Barana,Ana C.
ABSTRACT This study aimed to evaluate a structured bed reactor with intermittent aeration in the simultaneous removal of Chemical Oxygen Demand (COD) and Total Nitrogen (TN) from sanitary sewage. The reactor was operated for 339 days with a Hydraulic Retention Time (HRT) of 12 hours, temperature of 30 ± 1°C and continuous feeding. Nine trials were carried out in which three different effluent recirculation flow (Qr), 3, 2 and 1 time the incoming flow, were evaluated in three different aeration times, of 1h, 2h, and 3h, in 3 hour cycles. The results showed that different recirculation flows and aeration times did not influence the removal of COD, which reached 89%±12. It was observed that the efficiency of TN removal was higher in the tests with higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioreactor; Wastewater; Denitrification; Nitrification; SND (Simultaneous Nitrification and Denitrification).
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601236

HYDROPHOBIC MEMBRANE TECHNOLOGY FOR AMMONIA EXTRACTION FROM WASTEWATERS
Provedor de dados: 70
Autores: KUNZ,AIRTON; MUKHTAR,SAQIB.
ABSTRACT Total Ammoniacal Nitrogen - TAN (NH3 + NH4+) in wastewaters cause environmental degradation concerns due to their negative impacts on air, soil and water. Several technologies are available for TAN removal from the wastewaters. One emerging technology is the use of hydrophobic membrane as non-destructive NH3 extraction. In this paper the authors discuss the uses of gas permeable membrane (GPM) and its physicochemical characteristics that influence gas mass transfer rate, diffusion and recovery mechanisms of NH3 from liquid sources (e.g. animal wastewater). Several aspects of NH3 extraction from liquid manure and other TAN generation sources using GPM technology as well as its applicability for NH3 mitigation from liquid effluents and possible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Separation; Wastewater; Nutrient recovery.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000200377

INFLUENCE OF SUBSTRATE AND SPECIES ARRANGEMENT OF CULTIVATED GRASSES ON THE EFFICIENCY OF HORIZONTAL SUBSURFACE FLOW CONSTRUCTED WETLANDS
Provedor de dados: 70
Autores: Saraiva,Claudety B.; Matos,Antonio T.; Matos,Mateus P.; Miranda,Suymara T.
ABSTRACT We aimed to evaluate the efficiency of six different horizontal subsurface flow constructed wetlands (HSSF-CWs), with different substrates (gravel and crushed PET bottles), which also varied in relation to the presence and arrangement of plant species (elephant grass and Tifton 85 bermudagrass) in the removal of pollutants from a bulk milk cooling tank (MTWW). Each bed was fed at a flow rate of 0.18 m3 d-1 and average organic load rate (OLR) of 318 kg ha-1 d-1 of BOD5, with hydraulic detention time (HRT) of 1.84 days in the gravel-filled HSSF-CWs (CWS-G) and 2.97 days in the PET-filled HSSF-CWs (CWs-P). The CWs-P were as efficient as the CWs-G in the removal of BOD5, COD, Total-P, and K-Total, being in some cases even more effective (turbidity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Elephant grass; Tifton 85 bermudagrass; Plants; Porosity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300417

EXTRACTION CAPACITY OF GRASSES GROWN IN CONSTRUCTED WETLAND SYSTEMS USING DIFFERENT ARRANGEMENTS AND SUBSTRATES
Provedor de dados: 70
Autores: Saraiva,Claudety B.; Matos,Antonio T.; Matos,Mateus P. de.
ABSTRACT Constructed wetland systems have been used to treat different wastewater; among their essential components are the cultivated plant species and type of substrate used to fill them. The choice of plant species and type of substrate are important for the good system performance in wastewater treatment. This study aimed to evaluate the extraction capacity of Napier and Tifton 85 grasses when cultivated at different positions in horizontal subsurface flow constructed wetlands (HSSF-CWs) filled with different substrates in wastewater treatment from a bulk milk-cooling tank (MTWW). The experimental unit consisted of four HSSF-CWs, in which an average surface organic loading rate of 318 kg ha−1 d−1 of BOD5,20 was imposed and a hydraulic holding time of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Forage; Nutrients; Built wetlands.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500668

CHLOROPHYLL FLUORESCENCE OF BASIL PLANTS CULTIVATED IN A HYDROPONIC SYSTEM USING TREATED DOMESTIC WASTEWATER
Provedor de dados: 70
Autores: Gonçalves,Karoline S.; Alves,Lucylia S.; Paz,Vital P. da S.; Bandeira,Samir de S.
ABSTRACT Different techniques have been used to evaluate the energetic characteristics and damage to the photosynthetic apparatus of plants exposed to different stresses, including the measurement of chlorophyll fluorescence. The objective of this study is to evaluate the photosynthetic response by assessing the fluorescence parameters of chlorophyll a in basil (Ocimum basilicum L.) cv. Alfavaca Basilicão cultivated in a hydroponic deep-flow technique system using treated domestic wastewater. The study used a completely randomized block design with a 2 × 2 factorial scheme, in which the factors were the water source used for preparing the nutrient solution (tap water or treated domestic wastewater) and the height (upper and lower) of the platform of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Ocimum basilicum L.; Photosynthetic response.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000300288

Abundance and species composition of planktonic Ciliophora from the wastewater discharge zone in the Bahía Blanca Estuary, Argentina
Provedor de dados: 76
Autores: Barría de Cao,María Sonia; Pettigrosso,Rosa; Parodi,Elisa; Freije,Rubén.
The specific composition and abundance variation of the ciliate community from a wastewater discharge zone in the Bahía Blanca estuary, Argentina, were studied all throughout a year, from June 1995 to May 1996. The polluted area exhibited high values of particulate organic matter and nutrients, particularly phosphates. Aloricate ciliates were represented by 15 species belonging to the genera Strombidium Claparède &amp;amp; Lachmann, 1859; Strombidinopsis Kent, 1881; Cyrtostrombidium Lynn &amp;amp; Gilron, 1993; Strobilidium Schewiakoff, 1983; Lohmmanniella Leegaard, 1915 and Tontonia Fauré-Fremiet, 1914. Tintinnids were represented by nine species belonging to the genera Tintinnidium Kent, 1881, Tintinnopsis Stein, 1867 and Codonellopsis Jörgensen, 1924....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tintinnina; Ciliophora; Wastewater; Estuaries.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000300001

Risco de contaminação do solo e das plantas com metais pesados devido à irrigação com água produzida na extração de petróleo.
Provedor de dados: 14
Autores: CRISOSTOMO, L. A.; WEBER, O. B.; MIRANDA, F. R. de; SOUSA, A. F.; ARAGAO, F. A. S. de.
O reuso da água produzida em campo petrolífero pode ser alternativa para irrigação de culturas não alimentares quando não há riscos de contaminação ambiental. Este trabalho teve por objetivo avaliar o aporte de metais pesados na produção das oleíferas girassol (Helianthus annuusL) e mamona (Ricinus communis L.) e do abacaxizeiro ornamental (Ananas comosus var. erectifolius) irrigados com dois tipos de água produzida: filtrada (APF) e tratada por osmose reversa (APO) em comparação à água do subsolo, captada do aquífero Açu (ACA). As concentrações dos metais Ba, Cd, Co, Cr, Ni, Pb e Zn foram avaliadas no solo e nas plantas antes e após a irrigação por três ciclos de girassol, dois ciclos de mamona e um ciclo do abacaxizeiro. Portanto, recomenda-se o...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Salinização; Wastewater; Heavy metals.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1102058

Impact of urban effluents on summer hypoxia in the highly turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment transport and biogeochemical processes
Provedor de dados: 5
Autores: Lajaunie-salla, Katixa; Wild-allen, Karen; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Estuaries are increasingly degraded due to coastal urban development and are prone to hypoxia problems. The macro-tidal Gironde Estuary is characterized by a highly concentrated turbidity maximum zone (TMZ). Field observations show that hypoxia occurs in summer in the TMZ at low river flow and a few days after the spring tide peak. In situ data highlight lower dissolved oxygen (DO) concentrations around the city of Bordeaux, located in the upper estuary. Interactions between multiple factors limit the understanding of the processes controlling the dynamics of hypoxia. A 3D biogeochemical model was developed, coupled with hydrodynamics and a sediment transport model, to assess the contribution of the TMZ and the impact of urban effluents through wastewater...
Tipo: Text
Palavras-chave: Hypoxia; TMZ; Gironde Estuary; Wastewater; Oxygen; Modeling.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00388/49903/50475.pdf

Dynamics and control of a periodically forced microalgae culture
Provedor de dados: 5
Autores: Martínez, Carlos; Mairet, Francis; Martinon, Pierre; Bernard, Olivier.
Microalgae cultivation with wastewater is a promising way of reducing the energetic needs for wastewater treatment and the costs of biofuel production. However, the very turbid medium is not favorable for the development of microalgae. Indeed, light, the key element for photosynthesis, rapidly vanishes along depth due to absorption and scattering. Therefore it is crucial to understand the effects of the depth on turbid cultures. In this work, we study theoretically the long-term behavior of a continuous culture of microalgae exposed to a periodic source of light. By allowing periodic variations of the depth and the hydraulic retention time, we show that the microalgae population is forced to a periodic regime. Finally, we address numerically the problem of...
Tipo: Text
Palavras-chave: Dynamics and control; Industrial biotechnology; Wastewater; Biomass productivity; Microalgae.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00505/61623/65654.pdf

Retrospective non-target analysis to support regulatory water monitoring: from masses of interest to recommendations via in silico workflows
Provedor de dados: 5
Autores: Lai, Adelene; Singh, Randolph; Kovalova, Lubomira; Jaeggi, Oliver; Kondić, Todor; Schymanski, Emma L.
Background Applying non-target analysis (NTA) in regulatory environmental monitoring remains challenging—instead of having exploratory questions, regulators usually already have specific questions related to environmental protection aims. Additionally, data analysis can seem overwhelming because of the large data volumes and many steps required. This work aimed to establish an open in silico workflow to identify environmental chemical unknowns via retrospective NTA within the scope of a pre-existing Swiss environmental monitoring campaign focusing on industrial chemicals. The research question addressed immediate regulatory priorities: identify pollutants with industrial point sources occurring at the highest intensities over two time points. Samples from...
Tipo: Text
Palavras-chave: Non-target analysis; Suspect screening; Retrospective; Wastewater; Micropollutants; Cheminformatics; Identification; Monitoring; Regulation.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00689/80141/83195.pdf

Changes in the sediment trace metal contamination after the commissioning of a municipal wastewater treatment plant in the Souss estuary (South Morocco)
Provedor de dados: 5
Autores: Moukrim, A; Chiffoleau, Jean-francois; Cheggour, M; Burgeot, Thierry.
Monthly samples of sediment were collected from the Souss estuary, to determine the changes which have occurred in the concentrations of ten metals between 2001 when the low estuary was receiving the wastewaters from Agadir city and 2003 after stopping the sewage dumping. The annual contents of Cu, Fe, Zn (in 2001) and those of Cr, Cu, Fe, Mn, Ni, Pb, and Zn (in 2003) showed significant correlations with those of Al, indicating that fluctuations of their concentrations were only due to those of the aluminosilicate fraction of the clayey sediment. After normalization of these metallic concentrations in relation to those of Al, the contents of the different metals showed insignificant correlations between both years, except for Zn which significantly dropped...
Tipo: Text
Palavras-chave: Souss estuary; Wastewater; Sediment; Metal contamination.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-5923.pdf

Wastewater bioremediation by mangrove ecosystems impacts crab ecophysiology: in-situ caging experiment
Provedor de dados: 5
Autores: Theuerkauff, Dimitri; Rivera-ingraham, Georgina A.; Lambert, Sophia; Mercky, Yann; Lejeune, Mathilde; Lignot, Jehan-hervé; Sucré, Elliott.
Mangroves are tidal wetlands that are often under strong anthropogenic pressures, despite the numerous ecosystem services they provide. Pollution from urban runoffs is one such threats, yet some mangroves are used as a bioremediation tool for wastewater (WW) treatment. This practice can impact mangrove crabs, which are key engineer species of the ecosystem. Using an experimental area with controlled WW releases, this study aimed to determine from an ecological and ecotoxicological perspective, the effects of WW on the red mangrove crab Neosarmatium africanum. Burrow density and salinity levels (used as a proxy of WW dispersion) were recorded, and a 3-week caging experiment was performed. Hemolymph osmolality, gill Na+/K+-ATPase (NKA) activity and gill...
Tipo: Text
Palavras-chave: Mangrove; Bioturbation; Wastewater; Ecophysiology; Oxidative stress; Osmoregulation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00592/70449/68559.pdf

Composition and functional groups of epiedaphic ants (Hymenoptera: Formicidae) in irrigated agroecosystem and in nonagricultural areas
Provedor de dados: 86
Autores: Hernández-Ruiz,Patricia; Castaño-Meneses,Gabriela; Cano-Santana,Zenón.
The objective of this work was to evaluate the species composition and functional groups of ants in nonagricultural (NA) and in irrigated areas (S, seasonal irrigation; P, irrigation with well water; W, irrigation with wastewater) in an arid agricultural region in central Mexico, throughout 2005 and 2006. A total of 52,358 ants belonging to 6 subfamilies, 21 genera and 39 species was collected using pitfall traps. The species best represented in all plots were: Forelius pruinosus, Pheidole obtusospinosa, Monomorium minimum and Dorymyrmex spp. NA plots recorded the highest density of ants. The highest values for diversity (H') and equitativity (J') were recorded in NA and P plots, while the lowest were recorded in W plots. Cluster analysis showed two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Irrigated area; Semiarid zone; Wastewater.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800015

Private Sector Participation in the Water and Wastewater Services Industry
Provedor de dados: 31
Autores: Baumert,   Jennifer; Bloodgood,   Laura.
Countries introduce private sector participation into the water and wastewater utilities sector for a number of reasons. The introduction of a profit motive may increase efficiency as compared to public management of the water system, and private firms have been noted for customer service improvements. Financial considerations, including revenues from the sale of assets and reductions in the direct cost of providing water services, may also motivate governments to introduce private sector participation in this industry. However, because water is a basic human necessity, the introduction of private participation in this industry sector may raise social, economic, and national security concerns. Private participation in the global water and wastewater...
Tipo: Working or Discussion Paper
Palavras-chave: Water; Wastewater; Environmental services; Private sector participation; Public Economics.
Ano: 2004
URL: http://purl.umn.edu/15876

The Economic Value of Improved Wastewater Irrigation: A Contingent Valuation Study in Addis Ababa, Ethiopia
Provedor de dados: 31
Autores: Weldesilassie,   Alebel B.; Fror,   Oliver; Boelee,   Eline; Dabbert,   Stephan.
In developing countries the use of wastewater for irrigation can cause considerable harm to public health and the environment. This paper uses contingent valuation to estimate the economic value of safe use of wastewater for crop production on farms within and around Addis Ababa, Ethiopia. We estimate a surprisingly large welfare gain from policies for safe use of wastewater for irrigation. Our study highlights the potential and the possible pitfalls of using nonmarket valuation techniques as an input into public decision making where traditional resource use interacts with public health and environmental concerns in complex ways.
Tipo: Journal Article
Palavras-chave: Contingent valuation; Dichotomous choice; Ethiopia; Irrigation; Wastewater; Willingness to pay; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/57629

A framework for efficient wastewater treatment and recycling systems
Provedor de dados: 31
Autores: Mekala,   Gayathri Devi; Davidson,   Brian; Samad,   Madar; Boland,   Anne-Maree.
Use of un-treated/partially treated wastewater for irrigation in the dry countries of Asia and Africa and recycling of treated wastewater in the water scarce developed countries has become a common practice due to various reasons. While the lack of wastewater treatment to appropriate levels before use is a major problem in developing countries, the high cost of wastewater recycling is the major problem in developed countries. The current paper is part of a doctoral research and presents the conceptual framework for the research and the methodology that can be used to tackle the problems associated with wastewater recycling.
Tipo: Working or Discussion Paper
Palavras-chave: Water reuse; Wastewater; Recycling; Pricing; Water allocation; Cost benefit analysis; Wastewater irrigation; Developing countries; Developed countries; Case studies; India; Australia; Hyderabad; Melbourne; Agribusiness; Agricultural Finance; Crop Production/Industries; Demand and Price Analysis; Farm Management; Production Economics.
Ano: 2008
URL: http://purl.umn.edu/46387

Economics of Wastewater Treatment and Recycling: An Investigation of Conceptual Issues
Provedor de dados: 31
Autores: Devi,   Mekala Gayathri; Davidson,   Brian; Boland,   Anne-Maree.
In the context of continuous droughts, the search for alternative water sources and increasing environmental restrictions on discharge of treated wastewater into natural water bodies, treated wastewater recycling offers a potential solution. In this paper the methods needed to assess the questions - to what extent treated wastewater can complement the existing water sources in different sectors and at what cost - are discussed? It was concluded that a comparative Benefit Cost Analysis of different combinations of uses and treatment levels would be a critical component in the development of a decision support tool which could be used by urban planners and water authorities. It was also found that community acceptance of recycled water, distribution of costs...
Tipo: Conference Paper or Presentation
Palavras-chave: Wastewater; Recycling; Water quality; Pricing; Allocation; Urban design; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/9461

Effectiveness of Arsenic Co-Precipitation with Fe-Al Hydroxides for Treatment of Contaminated Water
Provedor de dados: 90
Autores: Mello,Jaime Wilson Vargas de; Gasparon,Massimo; Silva,Juscimar.
ABSTRACT Wastewater treatment is a challenging problem faced by the mining industry, especially when mine effluents include acid mine drainage with elevated arsenic levels. Iron (hydr)oxides are known to be effective in removal of As from wastewater, and although the resulting compounds are relatively unstable, the presence of structural Al enhances their stability, particularly under reducing conditions. The purpose of this study was to assess the effectiveness of Al-Fe (hydr)oxide co-precipitates for the removal of As from wastewater and to assess the chemical stability of the products. Different Al-Fe (hydr)oxides were synthesized at room temperature from ferrous and aluminum salts using three different Fe:Al molar ratios (1:0.0, 1:0.3, and 1:0.7) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Decontamination; Sludge stability; Magnetite; Goethite.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100513

Interaction between Thermotolerant Coliforms and Rhizobacteria in Soil Fertilized with Treated Domestic Wastewater
Provedor de dados: 90
Autores: Fortes Neto,Paulo; Fortes,Nara Lúcia Perondi; Silva,Eliana Maria de Araújo Mariano da; Brambatti,Fabiana.
ABSTRACT Studies on the survival of pathogenic microorganisms in the soil after use of wastewater for fertilization of agricultural crops report the effects of moisture, pH, organic matter, and soil temperature on microorganisms. There are few studies that assess the survival of these microorganisms in the rhizosphere of plants fertilized with wastewater. Thus, the aim of this study was to quantify the number of fecal coliforms and rhizobacteria (fluorescent Pseudomonas spp., Bacillus spp,) in the rhizosphere of winter and summer crops fertilized with wastewater. In the experiment, we used 20 plots, and each plot occupied an area of 200 m2. The treatments used in the winter crop consisted of uncultivated plots and single crops of wheat, triticale, black...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizosphere; Reclaimed water; Wastewater.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100414

Performance of pressure-compensating emitters using treated sewage effluent for irrigation
Provedor de dados: 91
Autores: Fischer Filho,João A.; Oliveira,Vinicius M. R. de; Dalri,Alexandre B.; Zanini,José R.
ABSTRACT This study aimed to evaluate the flow variation of pressure-compensating emitters using treated sewage effluent (TSE). A drip irrigation system with four types of pressure-compensating emitters (G1 - Naan Dan Jain Model Top Drip, G2 - Naan Dan Jain Model Naan PC, G3 - Drip-Plan, G4 - Naan Dan Jain Model Naan Amnon) was installed with TSE from the sewage treatment station, filtered through a disc filter (120 mesh). Seven evaluations of flow rate of the drippers were performed (0, 100, 200, 300, 400, 500 and 600 h of operation) operating at 100 kPa. The experimental design was completely randomized in a 4 x 7 factorial arrangement (4 models and 7 times) with four replicates and Tukey test to compare the means. The relative flow rate (Qr), flow rate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Trickle irrigation; Clogging; Water saving.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000869

Biological treatment of drippers clogged by the use of treated domestic wastewater
Provedor de dados: 91
Autores: Costa,Danniely O.; Batista,Rafael O.; Vale,Hudson S. M.; Sousa,Amanda B. de; Dombroski,Solange A. G.; Alves,Sandra M. C.
ABSTRACT This study aimed to recover the flow rate of clogged drippers with different doses and permanence times of the product MaxBio. The experiment was conducted in a completely randomized design in split-split-plot scheme, where the plots corresponded to product doses (80, 160, 240 and 320 mg L-1), subplots to the applied treatments (T1 - without biological treatment, T2 - 1st application of the product, and T3 - 2nd application of the product) and in sub-subplots the types of emitters (Plastro Hydrodrip Super, Netafim Tiran and Netafim PCJ-CNJ), with three replicates. The four irrigation units operated with treated domestic wastewater for 400 h in order to clog the emitters. After applying the product MaxBio, the flow rate of the drippers and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emitters; Wastewater; Unclogging; Bactéria.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000700595

Development of seedlings of watermelon cv. Crimson Sweet irrigated with biosaline water
Provedor de dados: 91
Autores: Silva,José E. S. B. da; Matias,Janete R.; Guirra,Keylan S.; Aragão,Carlos A.; Araujo,Gherman G. L. de; Dantas,Bárbara F.
ABSTRACTThe limited access and the scarcity of good quality water for agriculture are some of the major problems faced in agricultural areas, particularly in arid and semiarid regions. The aim of this study was to evaluate the quality of watermelon seedlings (cv. Crimson Sweet), irrigated with different concentrations of biosaline water of fish culture. The experimental design was completely randomized with five treatments, corresponding to biosaline water at different concentrations (0, 33, 50, 67 and 100%), and four replicates of 108 seedlings. Watermelon seeds were sown in plastic trays filled with commercial substrate and irrigated with different solutions of biosaline water. Seedlings were harvested for biometric analysis at 14, 21 and 28 days after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrullus lanatus; Wastewater; Salinity; Germination.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000900835

Performance of drippers in two filtering systems using sewage treatment effluent
Provedor de dados: 91
Autores: Dalri,Alexandre B.; Santos,Gilmar O.; Dantas,Geffson de F.; Faria,Rogério T. de; Zanini,José R.; Palaretti,Luiz F.
ABSTRACT The objective of this study was to evaluate the performance of three models of drippers using treated sewage effluent, pure and diluted, and two types of filters, screen and disc. The treated sewage effluent used in the experiment was collected from the city’s treatment plant. The experiment included 12 lateral lines with three types of emitters to apply pure (100%) and diluted (50%) effluent filtered by screen and disc filters. The combination of those factors set the treatments: T1 (50% effluent diluted in fresh water filtered by a screen filter); T2 (50% effluent diluted in fresh water filtered by a disc filter); T3 (pure effluent filtered by a screen filter); T4 (pure effluent filtered by a disc filter). The results showed that the flat type...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Emitters; Filter; Reuse; Irrigation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600363

Agricultural use of treated sewage effluents: agronomic and environmental implications and perspectives for Brazil
Provedor de dados: 63
Autores: Fonseca,Adriel Ferreira da; Herpin,Uwe; Paula,Alessandra Monteiro de; Victória,Reynaldo Luiz; Melfi,Adolpho José.
In many studies worldwide the use of treated sewage effluents (TSE) as water and nutrient sources in agricultural irrigation have been introduced as a viable alternative for wastewater destination in the environment. Considering agronomic and environmental aspects the objectives of this review were: (i) to present an overview of TSE irrigation on different agro-systems (annual crops, orchards, forests and forages); and (ii) to show the principal changes on chemical, physical and microbiological soil characteristics after TSE application. Various studies have revealed that the nutrient supply only by TSE irrigation was not sufficient to meet plant nutrient requirements resulting in yield decreases. The problem could be solved by an adapted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Water reuse; Nutrient source; Agriculture; Environmental impact.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200014

Comparison of White-rot Fungi and Ozone for Decolorization of Wastewater from Pulp and Paper Industry
Provedor de dados: 106
Autores: Vaithanomsat, P.; Apiwattanapiwat, W.; Siriacha, P.
Palavras-chave: Comparison; Ozone; Decolorization; Wastewater; Pulp; Paper; Industry.
Ano: 2006
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5018

Uso de “wetland” construído para tratamento de resíduos - DOI: 10.4025/actascibiolsci.v30i3.5002
Provedor de dados: 3
Autores: Sipaúba-Tavares, Lúcia Helena; UNESP - Jaboticabal; Braga, Francisco Manoel de Souza; UNEP Rio Claro.
Variáveis físico-químicas da água e do solo foram avaliadas a fim de verificar a eficiência de um “wetland” construído no tratamento de resíduos. Foram escolhidas oito espécies de macrófitas baseadas na capacidade de retenção e disponibilidade no local de estudo. Dentre elas estão: Eichhornia crassipes, Alternanthera philoxerodos, Heteranthera reniformis, Hydrocotyle umbeliferae, Ludwigia elegan, Ludwigia sericea, Myriophyllum aquaticum e Thypha domingensis. Foram amostrados dois pontos um na entrada e outro na saída de água do “wetland”. Diferenças significativas (p &lt; 0,05) foram observadas entre a entrada e saída do “wetland” em relação às variáveis limnológicas. Em geral, foram observadas concentrações de oxigênio dissolvido acima de 4 mg L-1 e de...
Palavras-chave: 2.00.00.00-6    Ciências Biológicas effluent; Wastewater; Physical and chemical parameters; Macrophyte. effluent; Wastewater; Physical and chemical parameters; Macrophyte.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5002

Use of Water Hyacinth (Eichhornia crassipes) to Treat Biogas Effluent of A Tapioca Industry Wastewater Treatment System
Provedor de dados: 111
Autores: Haryanto, Agus; Triyono, Sugeng; Siska, Posmaria Mei.
This research aims to evaluate performance of a water hyacinth (Eichornia crassipes (Mart) Solms) pond used to treat biogas effluent of a tapioca industry wastewater treatment system.  The water hyacinth pond which treats biogas effluent has been monitored for about two months.  Wastewater samples were taken from influent and effluent of the water hyacinth pond.  Parameters to be observed included wastewater quality parameters (pH, temperature, turbidity, BOD5, ammonia, solids, evapotranspiration, discharge, and hydraulic retention time) and water hyacinth parameters (growth, population density, moisture, ash, nutrient contents).  The results showed that water hyacinth improved some parameters of the biogas effluent to some extent.  Within HRT of 53 days,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Biogas; Environmental burden; Organic matter; Indonesia.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5867

Production of lipolytic enzymes by bacteria isolated from biological effluent treatment systems
Provedor de dados: 42
Autores: FURINI,GRACIANE; BERGER,JUSSARA S.; CAMPOS,JOSÉ A.M.; SAND,SUELI T. VAN DER; GERMANI,JOSÉ C.
Abstract This work aimed to evaluate the production of lipolytic complexes, produced by microorganisms isolated from a biological treatment system of effluents from a hotel. To select the best lipolytic microorganism for use in biotechnological processes, we tested 45 bacterial isolates recovered from the raw effluent of the hotel’s restaurant waste tank. Lipase production was assayed in culture medium supplemented with olive oil and rhodamine B, incubated at 25 °C and 30 °C for 24 h - 48 h. Results showed 22 isolates lipase producers. All isolates were inoculated on medium without yeast extract to select the ones with highest enzyme yields. Out of these, nine isolates showed high lipase activity. The strain with the larger halo was assayed in submerged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipolytic enzymes; Bacteria; Submerged culture; Wastewater.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602955

Photo-fenton remediation of wastewaters containing agrochemicals
Provedor de dados: 52
Autores: Teixeira,Antonio Carlos Silva Costa; Mendes,Lucas; Stollar,Giselle; Guardani,Roberto; Nascimento,Cláudio Augusto Oller do.
The photochemical degradation of agrochemicals in aqueous solution by means of advanced oxidation processes (AOPs) was studied. The photo-Fenton process was evaluated in terms of the time evolution of dissolved organic carbon (COD) and chemical oxygen demand (DOC), their total removals, and increase in biodegradability of treated wastewater. Under the experimental conditions studied, the process showed to be superior to other AOPs, at any Fe(II) and H2O2 concentrations. The results pointed towards the use of solar irradiation and low cost commercial application.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Advanced Oxidation Processes; Photo-Fenton; Agrochemicals; Wastewater.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400026

Microbial succession within an anaerobic sequencing batch biofilm reactor (ASBBR) treating cane vinasse at 55ºC
Provedor de dados: 52
Autores: Ribas,Maria Magdalena Ferreira; Chinalia,Fabio Alexandre; Pozzi,Eloisa; Foresti,Eugenio.
The aim of this work was to investigate the anaerobic biomass formation capable of treating vinasse from the production of sugar cane alcohol, which was evolved within an anaerobic sequencing batch biofilm reactor (ASBBR) as immobilized biomass on cubes of polyurethane foam at the temperature of 55ºC. The reactor was inoculated with mesophilic granular sludge originally treating poultry slaughterhouse wastewater. The evolution of the biofilm in the polyurethane foam matrices was assessed during seven experimental phases which were thus characterized by the changes in the organic matter concentrations as COD (1.0 to 20.0 g/L). Biomass characterization proceeded with the examination of sludge samples under optical and scanning electron microscopy. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobic digestion; Adaptation phase; Wastewater; Sugar cane; Biofilm; Microbiology.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400028

Alterations in proteins and amino acids of the Nile cyanobacteria Pseudanabaena limnetica and Anabaena wisconsinense in response to industrial wastewater pollution
Provedor de dados: 52
Autores: El-Sheekh,Mostafa Mohamed; El-Otify,Ahmed Mohamed; Saber,Hani.
The effect of industrial wastewater on the Nile cyanobacteria Pseudanabaena limnetica and Anabaena wisconsinense was investigated. The data showed that P. limnetica was more sensitive to pollution than A. wisconsinense. The treatments with different levels of wastewater exerted pronounced reductions in protein and amino acids content. SDS-PAGE analysis revealed that the cyanobacteria grown in the industrial wastewater showed induction in the synthesis of certain polypeptides and repression of others. The treatments of P. limnetica with wastewater stimulated the appearance of six protein bands with molecular masses of 28, 30, 31, 32, 58 and 97 kDa. The same treatments caused the disappearance of 20, 38 and 56 kDa. The structural protein pattern of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acids; Anabaena; Electrophoretic patterns; Nile cyanobacteria; Protein; Pseudanabaena; Wastewater.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400022

Gill histopathological alterations in Nile tilapia, Oreochromis niloticus exposed to treated sewage Water
Provedor de dados: 52
Autores: Fontaínhas-Fernandes,António; Luzio,Ana; Garcia-Santos,Sofia; Carrola,João; Monteiro,Sandra.
Adult Nile tilapia, Oreochromis niloticus, of both sexes were exposed in wastewater from a sewage treatment plant for a period of 4 days. Gill samples were collected after 24, 48, 72 and 96 h and histopathological changes were analyzed by light and scanning electronic microscopy. Gill epithelium of control O. niloticus (freshwater group) was similar to that of other teleosts, while histopathological lesions were observed in exposed fishes. The main histopathological changes were edema, lifting of lamellar and filamentar epithelia and lamellar fusion. Cell proliferation with consequent thickening of the filament epithelium was also found in fishes exposed to the treated sewage water. The severity of the lesions increased with the time of exposure, namely...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gill; Tilapia; Histopathology; Wastewater.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500023

Treatment of simulated wastewater containing n-phenyl-n-isopropyl-p-phenylenediamine using electrolysis system with Ti/TiRuO2 electrodes
Provedor de dados: 52
Autores: Inazaki,Thelma Helena; Pião,Antonio Carlos Simões; Bidoia,Ederio Dino.
This study investigated the effects of the electrolytic treatment in the simulated wastewater with aromatic amine n-phenyl-n-isopropyl-p-phenylenediamine (Flexzone 3P®) using Ti/TiRuO2 electrodes under 0.025 A/cm² (DC) for different electrolysis durations (5; 15; 30; 45 and 60 min). Conductivity, pH, UV-visible spectra, gas chromatograms, toxicity and biodegradation tests were carried out. During the electrolytic treatment the pH decreased and conductivity increased slightly. After 60 min of electrolysis, the concentration of Flexzone 3P decreased by 65.1%. UV-vis spectra and chromatograms of simulated wastewater showed changes in the molecular structure of the aromatic amine. After 5 and 15 min of electrolysis, the simulated wastewater containing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrolytic treatment; Wastewater; Ti/TiRuO2 electrodes.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000600018

Production of Propionic Acid by Propionibacterium acidipropionici from Agroindustrial Effluents
Provedor de dados: 52
Autores: Teles,Jéssica Cristine; Stolle,Elaine Macedo; Koloda,Stela Aparecida; Barana,Ana Claudia.
Abstract The purpose of this paper was to evaluate the production of propionic acid from the fermentation of agroindustrial effluents using a Propionibacterium acidipropionici culture. The composition of the substrates was determined by using an experimental design of mixtures, resulting in 10 trials. The substrates were fermented in batch borosilicate glass reactors at a temperature of 35°C, initial pH of 6.5, and 20 mL.L-1 of inoculum suspension. The highest yield of propionic acid production, 0.79 g of product per g of substrate, was obtained with a substrate composed only of corn steep liquor, which showed a productivity of 5.20 mg.L-1h-1 and production of 0.40mL.L-1. These results showed that the corn steep liquor positively influenced performance and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroindustrial by-products; Fermentation; Corn steep liquor; Cheese whey; Wastewater.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100702

Oxidative Stress, Chromium-Resistance and Uptake by Fungi: Isolated from Industrial Wastewater
Provedor de dados: 52
Autores: Elahi,Amina; Rehman,Abdul.
ABSTRACT Trichosporon asahii and Rhodotorula mucilaginosa isolated from wastewater effluents were identified as chromium-resistant yeasts. Cr(VI) concentrations at 8 mM and 6 mM were inhibitory for R. mucilaginosa and T. asahii. Remarkably elevated GSH (69.88 ± 10.01) and GSSG (11.24 ± 0.96) was observed under metal stress in T. asahii as compared to R. mucilaginosa GSH (18.95 ± 3.19) and GSSG (3.7 ± 2.74) mM g-1 8 level. Statistical analysis revealed significantly higher GSH/GSSG ratio in both strains. NPSH (29.84 ± 0.54) level in T. asahii was much higher than in R. mucilaginosa (6.05 ± 0.24). Chromate reductase (ChR) was assayed and its activity was optimum at 50°C (pH 6) in T. asahii while R. mucilaginosa showed higher activity at 30°C (pH 7). Activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichosporon asahii; Rhodotorula mucilaginosa; Wastewater; Resistance; Bioaccumulation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100452

Evaluation and enhancement of heavy metals bioremediation in aqueous solutions by Nocardiopsis sp. MORSY1948, and Nocardia sp. MORSY2014
Provedor de dados: 58
Autores: El-Gendy,Mervat Morsy Abbas Ahmed; El-Bondkly,Ahmed Mohamed Ahmed.
ABSTRACT An analysis of wastewater samples collected from different industrial regions of Egypt demonstrated dangerously high levels of nickel (0.27-31.50 mg L-1), chromium (1.50-7.41 mg L-1) and zinc (1.91-9.74 mg L-1) in the effluents. Alarmingly, these heavy metals are among the most toxic knownones to humans and wildlife. Sixty-nine Actinomycete isolates derived from contaminated sites were evaluated under single, binary, and ternary systems for their biosorption capacity for Ni2+, Cr6+ and Zn2+ from aqueous solutions. The results of the study identified isolates MORSY1948 and MORSY2014 as the most active biosorbents. Phenotypic and chemotypic characterization along with molecular phylogenetic evidence confirmed that the two strains are members of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosorption; Heavy metals; Dead and live biomass; Nocardiopsis; Nocardia; Wastewater.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300571

A DNA pooling based system to detect Escherichia coli virulence factors in fecal and wastewater samples
Provedor de dados: 58
Autores: Luz María Chacón,J; Lizeth Taylor,C; Carmen Valiente,A; Irene Alvarado,P; Ximena Cortés,B.
The availability of a useful tool for simple and timely detection of the most important virulent varieties of Escherichia coli is indispensable. To this end, bacterial DNA pools which had previously been categorized were obtained from isolated colonies as well as selected in terms of utilized phenotype; the pools were assessed by two PCR Multiplex for the detection of virulent E. coli eaeA, bfpA, stx1, stx2, ipaH, ST, LT, and aatA genes, with the 16S gene used as DNA control. The system was validated with 66 fecal samples and 44 wastewater samples. At least one positive isolate was detected by a virulent gene among the 20 that were screened. The analysis of fecal samples from children younger than 6 years of age detected frequencies of 25% LT positive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Virulence genes; Wastewater; Fecal; Screening system; Escherichia coli.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400012

Antimicrobial susceptibility and virulence-associated genes in Campylobacter isolates from milk and wastewater in Hatay, Turkey
Provedor de dados: 65
Autores: Elmalı,Mehmet; Can,Hayriye Yeşim.
ABSTRACT:  Campylobacter is one of the most common causes of bacterial foodborne diseases throughout the world. This study was conducted to determine the prevalence, antimicrobial resistance and virulence of Campylobacter isolates of raw cow’s milk and cattle slaughterhouse wastewater samples in Hatay, Turkey. A total of 114 raw milk and 78 wastewater samples were analyzed for the identification of C. jejuni, C. coli, and C. lari by multiplex PCR. The overall prevalence of Campylobacter was found to be 7.2%, of these isolates, 85.7% were identified as C. jejuni and 14.2% as C. coli, but C. lari was not detected in the study. The cdtA and cadF genes were present in 66.6% and 41.6% of C. jejuni isolates tested, respectively, but wlaN gene was not found in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial resistance; Campylobacter; Milk; Wastewater.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000500450

Non-pressure compensating emitters using treated sewage effluent for irrigation
Provedor de dados: 65
Autores: Fischer Filho,João Alberto; Dalri,Alexandre Barcellos; Santos,Miquéias Gomes dos; Zanini,José Renato; Faria,Rogério Teixeira de.
ABSTRACT: This study aimed to evaluate the obstruction of non-pressure compensating emitters using treated sewage effluent (TSE) for irrigation. A drip irrigation system with six models of emitters (encoded) was installed in level field conditions. TSE coming from a sewage treatment station was used as irrigation water after being filtered through a disc filter (120 mesh). Seven flow rate evaluations of drippers operating at 100kPa were performed (0, 100, 200, 300, 400, 500 and 600h of operation). The experimental design was randomized in a 6×7 factorial arrangement (6 models and 7 times), with four repetitions, and Tukey’s test was used to compare means. Relative flow rate (Qr), the flow rate coefficient of variation (CVQ) and degree of clogging (GE) were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Trickle irrigation; Clogging; Water saving.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700351