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A review of water quality and pollution studies in Tanzania OceanDocs
Mohammed, S.M..
Institute of Marine Sciences Zanzibar
Tipo: Journal Contribution Palavras-chave: Water quality; Water pollution.
Ano: 2002 URL: http://hdl.handle.net/1834/741
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Acute toxicity tests of a textile mill wastewater effluent and a "detergent wash" with a Hermit crab (Climbinarius Africanus) (Aurivillius) OceanDocs
Ajao, E.A..
Bioassay tests were conducted with wastewater effluents from a textile mili and a detergent packing plant using the hermit crab. Clibinarius africanus. (Aurivillus) as experimental animal. LC50 values were evaluated using static testing procedures for 24, 48 and 96 hour. For the textile effluent, means of 79.0, 50.24 and 51.81 percentage effluent by volume were obtained in respect of crabs in the “medium” weight range (0.3 – 0.7grams) for the test periods. For the “detergent wash”, 95.16, 85.00 and 82.33 percentage effluent by volume represented means of values obtained for “small” size crabs (weight range 0.08–0.24 grams) and 96.0, and 81.50 percentage effluent by volume for ‘medium’ size crabs for 24, 48 and 96 hour respectively. Spearman’s Rank...
Tipo: Report Palavras-chave: Pollutants; Water pollution; Pollutants; Water pollution; Http://aims.fao.org/aos/agrovoc/c_6076; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1985 URL: http://hdl.handle.net/1834/2440
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Agricultura e qualidade da agua: contaminacao da agua por nitrato. Infoteca-e
RESENDE, A. V. de.
bitstream/CPAC-2009/24718/1/doc_57.pdf
Tipo: Documentos (INFOTECA-E) Palavras-chave: Contamination; Health.; Contaminação; Fósforo; Impacto Ambiental; Nitrogênio; Poluição da Água; Saúde.; Recurso Hídrico; Qualidade da Água; Environmental impact; Eutrophication; Nitrates; Nitrogen; Phosphorus; Water resources.; Water quality; Water pollution.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546464
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Assessment of the water quality in a large reservoir in semiarid region of Brazil AGRIAMBI
Lopes,Fernando B.; Andrade,Eunice M. de; Meireles,Ana C. M.; Becker,Helena; Batista,Adriana A..
The aim of this study was to identify spatial and temporal variations in water quality of Orós reservoir, Ceará, Brazil, as well as the sources of contamination. To get this information the Principal Component Analysis (PCA) and Cluster Analysis (CA) was used. Water samples were collected at seven (geo-referenced) points, from April 2008 to March 2011, totalling 4,032 samples. The following attributes of the waters were analysed: temperature, pH, CE, Ca2+, Mg2+, Na+, K+, Cl-, HCO3-, SO4--, turbidity, colour, Sechi transparency, TS, TVS, TFS, TSS, VSS, FSS, TDS, DO, BO5D, total phosphorus, soluble orthophosphate, EC, TTC, total ammonia, TKN, nitrate, SAR and chlorophyll-a. The PCA promoted the reduction from the 32 initial variables to 14, accounting for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water quality; Water pollution; Multivariate statistics.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000400012
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Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation BABT
Gonzalez,Alessandra M.; Paranhos,Rodolfo; Andrade,Luciana; Valentin,Jean L..
The aim of this work was to evaluate the necessary ³H-leucine concentration to estimate bacterial production in Guanabara Bay through saturation curves. A second aim was to collect preliminary data of bacterial production in two distinct sites corresponding to different water qualities: Urca inlet and Governador Island. Saturation curves were made with water samples taken at the main circulation channel of the bay, Paquetá Island, and the two sites mentioned before. The ³H-leucine curves showed similar pattern for all studied areas, indicating the ideal isotope concentration to be 10 nM. Bacterial biomass production ranged from 0.40 to 4.53 µgC L-1 h-1 in Urca and from 3.86 to 73.72 µgC L-1 h-1 in Governador Island indicating the relationship between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Activity measurement; Heterothrophic production; Estuary; Water pollution; Eutrophication.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500008
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Colombia's Discharge Fee Program: Incentives for Polluters of Regulators? AgEcon
Blackman, Allen.
Colombia's discharge fee system for water effluents is often held up as a model of a well-functioning, economic-incentive pollution control program in a developing country. Yet few objective, up-to-date evaluations of the program have appeared. Based on a variety of primary and secondary evaluative data, this paper finds that that the program has been beset by a number of serious problems including limited implementation in many regions, widespread noncompliance by municipal sewage authorities, and a confused relationship between discharge fees and discharge standards. Nevertheless, in several watersheds, pollution loads dropped significantly after the program was introduced. While proponents claim the incentives that discharge fees created for polluters...
Tipo: Working or Discussion Paper Palavras-chave: Environment; Economic incentive; Market based instrument; Discharge fees; Water pollution; Latin America; Colombia; Environmental Economics and Policy; Q53; Q56; Q58; O13; O54.
Ano: 2005 URL: http://purl.umn.edu/10869
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Comparison between four and seven-day Ceriodaphnia dubia survival and reproduction test protocols using oil refinery effluent samples BABT
Oliveira-Filho,Eduardo Cyrino; Da-Matta,Anndressa Camillo; Cabral,Lucianna Lopes; Veiga,Letícia Falcão; Paumgartten,Francisco José Roma.
The aim of this study was to compare the 7-day Ceriodaphnia dubia survival and reproduction test with a 4 day test to evaluate the toxicity of oil refinery effluents. Both shown identical NOECs with three of 6 tested samples. With one of the tested samples, the 4-day NOEC was one tested-concentration lower, and with the remaining two samples, it was one tested-concentration higher than those obtained using the 7-day protocol. Then results suggested that 4 and 7-day protocols were comparable to detect toxic effects.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic toxicology; Water pollution; Ecotoxicology; Oil refinery effluents; Reproduction; Aquatic chronic tests.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100017
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Contaminación del agua con nitratos y nitritos y su impacto en la salud pública en la zona de influencia del módulo de riego (I-1) La Antigua, Ver. México. Colegio de Postgraduados
Galaviz Villa, Itzel.
La contaminación de las aguas emerge como una consecuencia de los asentamientos humanos y de las actividades rurales, agrícolas, silvícolas e industriales en una región. Se ha encontrado que al incrementarse el uso de fertilizantes nitrogenados también se produce un mayor impacto contaminante en las aguas. Los nitratos y nitritos disueltos en agua subterránea, destinada al consumo humano, ocasionan efectos negativos en la salud, tales como; la producción de nitrosaminas (causa del cáncer) y la disminución de la capacidad de transporte de oxígeno por la sangre, conocida como síndrome del bebe azul. El objetivo del presente estudio fue determinar la relación entre la concentración de nitratos y nitritos disueltos en el agua de consumo humano, y la incidencia...
Palavras-chave: Agroecosistemas; Fertilizantes nitrogenados; Contaminación del agua; Cáncer; Agroecosystems; Nitrogen fertilizers; Water pollution; Cancer; Doctorado; Agroecosistemas Tropicales.
Ano: 2010 URL: http://hdl.handle.net/10521/429
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Contamination de l'estuaire et de la baie de Seine par le PCB-Bilan des etudes ArchiMer
Abarnou, Alain; Simon, S.
This report is a synthesis of data concerning PCB concentrations in water, sediments and organisms (Bivalvia, Malacostraca, Pisces). Water analysis shows that Seine River is the primordial factor affecting PCB dispersion in the bay. Sediment contamination is higher near estuary along Calvados coast. PCB levels in Mytilidae and in Pectinidae set the problem of polluant origin, dispersion and effects on estuarine organisms.
Tipo: Text Palavras-chave: Bioaccumulation; Sediment pollution; Water pollution; PCB; Environmental impact.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1319.pdf
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Contiguous urban rivers should not be necessarily submitted to the same management plan: the case of Tietê and Pinheiros Rivers (São Paulo-Brazil) Anais da ABC (AABC)
Cunha,Davi G. F.; Grull,Doron; Damato,Murilo; Blum,José R. C.; Eiger,Sergio; Lutti,José E.I.; Mancuso,Pedro C. S..
The management of urban water resources plays an important role for developing countries. The Tietê and Pinheiros Rivers (São Paulo, Brazil) are affected by domestic and industrial effluents and by the diffuse pollution. This research aimed to quantify 134 variables in the water of Tietê and Pinheiros Rivers (approximately 7,200 and 6,600 analyses, respectively) from August 2007 to December 2008. The idea was to verify if the fact that both rivers are located in the same basin is enough to consider the application of a single management plan for both. Data showed that the rivers presented significant anthropogenic interference. The results suggested that such rivers must be subjected to individual management plans since there were exclusive occurrences...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental monitoring; Metropolitan region of São Paulo (MRSP); Urban rivers; Water pollution; Water quality; Watershed management.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400032
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Copper toxicity for Scinax ruber and Rhinella granulosa (Amphibia: Anura) of the Amazon: Potential of Biotic Ligand Model to predict toxicity in urban streams Acta Amazonica
Franco-de-Sá,Jorge Felipe Oliveira; Val,Adalberto Luis.
In the last years many populations of anurans have declined and extinctions have been recorded. They were related to environmental pollution, changes of land use and emerging diseases. The main objective of this study was to determine copper sensitivity of the anuran of the Amazon Rhinella granulosa and Scinax ruber tadpoles at stage 25 and Scinax ruber eggs exposed for 96 h to copper concentrations ranging from 15 µg Cu L-1 to 94 µg Cu L-1. LC50 at 96 h of Rhinella granulosa Gosner 25, Scinax ruber Gosner 25 and Scinax ruber eggs in black water of the Amazon were 23.48, 36.37 and 50.02 µg Cu L-1, respectively. The Biotic Ligand Model was used to predict the LC50 values for these species and it can be considered a promising tool for these tropical species...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amphibian; LC50-96h; Copper; BLM; Water pollution.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400010
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Degradation of the riparian wetlands in the Lake Victoria basin - Yala swamp case study OceanDocs
Thenya, Thuita; Wassmann, Reiner; Verchot, Louis; Mungai, David.
Land degradation is as a result of broad range of scales and factors, which include biophysical, climatic, demographic and socio-economic. The aim of this paper was to provide an analysis of wetland utilisation, ecosystem degradation and their effect on the Lake Victoria (Kenya) ecosystem. This involved analysis of socioeconomic and remote sensed data. The main sources of wetland degradation in the Lake Victoria basin were identified as (1) farming activities, (2) grazing and macrophyte harvesting and (3) coupled with catchment degradation-deforestation. These factors were closely related to the demographic dynamics and unsustainable land utilisation practices. Socio-economic data provided valuable insight on the pattern of wetland utilisation and possible...
Tipo: Proceedings Paper Palavras-chave: Riparian environments; Degradation; Wetlands; Inland waters; Catchment area; Remote sensing; Environmental effects; Socioeconomic aspects; Resource development; Sediment transport; Silting; Water pollution; Wetlands; Deforestation; Natural resources; Utilization; Land use; Pollutants.
Ano: 2006 URL: http://hdl.handle.net/1834/5313
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Determination of selenium toxicity to Oreochromis niloticus based on hematological parameters - doi: 10.4025/actascibiolsci.v34i2.8755 Biological Sciences
Seriani, Robson; Instituto de Pesca-SP - IP/SAA.; Ranzani-Paiva, Maria José Tavares; Instituto de Pesca-SP - IP/SAA.; Gonçalves, Adriano; Centro de Aquicultura, Universidade Estadual Paulista “Júlio de Mesquita Filho"; Siqueira, Silmara Regina; Instituto de Pesca-SP - IP/SAA.; Lombardi, Julio Vicente; Instituto de Pesca-SP - IP/SAA..
Selenium (Se) is described as an essential micronutrient and participates in different biological functions, as the antioxidant defense systems maintenance and regulation. However, when in high concentrations, Se may cause toxic effects as well as hematological changes in fish. The aim of the present study was to determine the toxicity of selenium in the form of sodium selenate (Na2Se6+O4) in Oreochromis niloticus based on hematological parameters, after exposure to different concentrations (0.01, 0.14 and 1.4 mg Se6+ L-1). The erythrocytic and leukocytic series were examined over 14 days at intervals of 0, 3, 5, 7,10 and 14 days. The erythrocytic series showed significant alterations in the first 7 days, including the control group. Neutrophils and...
Palavras-chave: 2.07.01.00-4 haematological; Water pollution; Selenium; Toxicity Fisiologia.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8755
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Enterococcus spp. Resistant to Multiple Antimicrobial Drugs and Determination of Fecal Contamination Levels in Mangrove Oysters (Crassostrea rhizophorae) BABT
Rubião,Cynthia Annes; Franco,Robson Maia; Mesquita,Eliana de Fátima Marques de; Miguel,Marco Antonio Lemos; Cabral,Claudius Couto; Fonseca,Ana Beatriz Monteiro.
ABSTRACT The aim of this study was to determine and compare the Most Probable Number (MPN) of Total Coliforms (TC), Escherichia coli and Enterococcus spp. and to characterize the antimicrobial resistance profiles of Enterococcus spp. isolated from oysters collected in the Barra de Guaratiba Mangrove, Rio de Janeiro, Brazil. The enumeration of E. coli has been used to indicate fecal contamination and hygienic-sanitary conditions of bivalve molluscs. Enterococci are capable to transfer several antimicrobial resistance genes to pathogenic bacteria, including those from Gram-negative group. The oysters were bought from local fishermen and a total of 123 individuals were analyzed. The TC, E. coli and Enterococcus spp. MPN mean were 26,300/100 g, 3,260/100 g and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water pollution; Escherichia coli; Enterococcus spp.; Antimicrobial resistance; Bivalve molluscs.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100308
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Estimation des niveaux de pollution organique et bactérienne des eaux à proximité des berges de la ville d'Abidjan (lagune Ebrié-Côte d'Ivoire) OceanDocs
Guiral, D.; Kouassi, A.M.; Arfi, R..
Trois campagnes sur l'ensemble de la zone urbaine de la lagune Ebrié (Abidjan, Côte d'Ivoire)ont été réalisées à trois saisons caractéristiques de l'hydroclimat lagunaire (grande saison sèche, grande saison des pluies, petite saison des pluies et crue fluviale)pour estimer les niveaux de pollution organique (seston, ions, ammonium et orthophosphates) et bactérienne ( E.coli et C.perfringens) des eaux à proximité des berges.Celles-ci présentent une forte eutrophisation caractérisée par des concentrations en permanence très élevées pour N-NH4 et lors de la grande saison sèche pour P-PO4. Les charges minérales solides s'accroissent en période de forte dessalure et plus particulièrement lors de la grande saison des pluies.A l'opposé, les charges organiques...
Tipo: Journal Contribution Palavras-chave: Water pollution; Microbial contamination; Embankments.
Ano: 1993 URL: http://hdl.handle.net/1834/5735
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Estudio de la calidad de las aguas del Estero del Muerto en base a la concentración de oxígeno disuelto.- Estación fija OceanDocs
Valencia, M.; Burgos, L.; de Espinoza, M..
Se presenta un análisis de la influencia de la marea y profundidad sobre la concentración de oxígeno disuelto en aguas del Estero del Muerto, Provincia del Guayas. Se establece que existe una relación directa de estos dos factores sobre la msima. Se encuentra mayor concentración de oxígeno disuelto en superficie, la cual disminuye conforme aumenta la profundidad, siendo mayor durante el flujo que durante el reflujo; existe un leve incremento durante la noche como producto de la agitación de las aguas por acción del viento. En forma general se concluye que existen condiciones de oxígeno en el área, lo que indica problemas de contaminación del estero.
Tipo: Journal Contribution Palavras-chave: Water quality; Swamps; Oxygen; Water pollution; Water quality; Swamps; Oxygen; Water pollution; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_5477; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1987 URL: http://hdl.handle.net/1834/2155
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Examining the Effects of Ecological and Political Boundaries on the Potential for Water Quality Trading: Lessons from a Southeastern Trading Framework AgEcon
Keiser, David A.; Mullen, Jeffrey D.; Bergstrom, John C.; Smith, Nathan B.; Radcliffe, David E.; Risse, Mark L.; Fowler, Laurie A..
Water quality trading (trading) as a means to improve water quality has become an increasingly popular instrument considered by environmental policy makers. Although the U.S. Environmental Protection Agency lists more than forty current trading programs in the U.S., only a few active markets exist. The literature identifies several hurdles to trading, overcoming which requires a deeper understanding of the interaction between local environmental, legal, and economic conditions. Particular challenges include thin markets, uncertainty related to the course and fate of nutrient flows, varying degrees of political support, and high transaction costs related to market infrastructure, monitoring, and enforcement. These hindrances often arise from and...
Tipo: Conference Paper or Presentation Palavras-chave: Water quality trading; Phosphorus trading; Nutrient trading; Water pollution; Pollution markets; Environmental Economics and Policy; Land Economics/Use; Public Economics.
Ano: 2009 URL: http://purl.umn.edu/49323
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Frequency of transferable multiple antibiotic resistance amongst coliform bacteria isolated from a treated sewage effluent in Antofagasta, Chile Electron. J. Biotechnol.
Silva,Juan; Castillo,Gabriela; Callejas,Lorena; López,Héctor; Olmos,Janet.
Antibiotic-resistant coliform bacteria from raw and treated water from activated sludge of a sewage treatment plant were isolated on eosin methylene blue agar (EMB) plates in the separate presence of ampicillin, tetracycline, chloramphenicol and streptomycin. Antibiotic resistant coliforms obtained from inflow and effluent waters were studied to determine influences of treatment on the species composition, resistance patterns and transferable resistance in these bacteria. The bacterial counts obtained showed a high proportion of antibiotic resistant coliforms in the treated effluent. The resistant coliform species were eliminated at different rates by the treatment. Escherichia coli decreased, whereas the proportion of Klebsiella sp increased. The...
Tipo: Journal article Palavras-chave: Antibiotic resistance; Coliforms; Plasmid; Sewage treatment; Water pollution.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500008
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Groundwater pollution and emerging environmental challenges of industrial effluent irrigation in Mettupalayam Taluk, Tamil Nadu AgEcon
Mukherjee, Sacchidananda; Nelliyat, Prakash.
Industrial disposal of effluents on land and the subsequent pollution of groundwater and soil of surrounding farmlands – is a relatively new area of research. The environmental and socioeconomic aspects of industrial effluent irrigation have not been studied as extensively as domestic sewage based irrigation practices, at least for a developing country like India. The disposal of effluents on land has become a regular practice for some industries. Industries located in Mettupalayam Taluk, Tamil Nadu, dispose their effluents on land, and the farmers of the adjacent farmlands have complained that their shallow open wells get polluted and also the salt content of the soil has started building up slowly. This study attempts to capture the environmental and...
Tipo: Working or Discussion Paper Palavras-chave: Groundwater; Water pollution; Income; Water quality; Irrigation water; Effluents; Wells; Drinking water; Domestic water; Households; Soil salinity; Crop management; Agricultural and Food Policy; Crop Production/Industries; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/91902
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Grow-out mariculture techniques in tropical waters: A case study of problems and solutions in Hong Kong. ArchiMer
Wu, R; Lee, J.
Raft culture is practised and trash fish is being used as feed in Hong Kong. Culture space is limited and most of the culture sites are over-crowded. Food conversion ratio is poor (about 10-15), grow-out mortality is high (30-50%) and fish kills caused by oxygen depletions, algal blooms and red tides occur frequently. Disease and water pollution are also problems.
Tipo: Text Palavras-chave: Sparidae; Pisces; Indicator species; Diseases; Water pollution; Cage culture; Artificial feeding; Food fish; Oxygen depletion; Mortality; Growth; Stocking density; Fish culture.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-1427.pdf
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