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| Registros recuperados: 11 | |
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| Kispergher,Eduardo M.; D'Aquino,Camila A.; Costa Junior,Luis C. da; Mello,Thiago C. de; Weinschutz,Regina; Mathias,Alvaro L.. |
| ABSTRACT: This study aimed to evaluate the effect of variations in organic load (hydraulic retention times - HRTs: from 2 to 0.5 day) and in alkalinity (NaHCO3 from 4,000 to 1,000 mg.L−1) on methane production. Biomass of sewage sludge was inoculated and stabilized on 1" polypropylene rings. The rings were immersed in the liquid phase (8.41 L) of an upflow anaerobic filter reactor (12.22 L). A solution of 5 g of whole milk powder per liter was used to simulate effluent from the dairy industry. Process effectiveness was measured by chemical oxygen demand reduction, biogas production, and biogas methane content. Biogas production started at a 2-day HRT and synthetic effluent alkalinization with 4,000 mg.L−1 NaHCO3. The best operation condition was at 1-day... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy industry; Biofilter; Hydraulic retention time; Alkalinity; Biogas. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400820 |
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| Lefèvre, Nathalie; Mejia, Carlos; Khvorostyanov, Dmitry; Beaumont, Laurence; Koffi, Urbain. |
| The carbon system in the eastern tropical Atlantic remains poorly known. The variability and drivers of the carbon system are assessed using surface dissolved inorganic carbon (DIC), alkalinity (TA) and fugacity of CO2 (fCO2) measured in the 12° N–12° S, 12° W–12° E region from 2005 to 2019. A relationship linking DIC to temperature, salinity and year has been determined, with salinity being the strongest predictor. The seasonal variations of DIC, ranging from 80 to 120 mol kg−1, are more important than the year-to-year variability that is less than 50 mol kg−1 over the 2010–2019 period. DIC and TA concentrations are lower in the northern part of the basin where surface waters are fresher and warmer. Carbon supply dominates over biological carbon uptake... |
| Tipo: Text |
Palavras-chave: Carbon cycle; Tropical Atlantic; Dissolved inorganic carbon; Alkalinity. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00678/79046/81494.pdf |
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| Fry, Claudia H.; Tyrrell, Toby; Hain, Mathis P.; Bates, Nicholas R.; Achterberg, Eric P.. |
| The export of calcium carbonate (CaCO3) from the surface ocean is poorly constrained. A better understanding of the magnitude and spatial distribution of this flux would improve our knowledge of the ocean carbon cycle and marine biogeochemistry. Here, we investigate controls over the spatial distribution of total alkalinity in the surface global ocean and produce a tracer for CaCO3 cycling. We took surface ocean bottle data for total alkalinity from global databases (GLODAP, CARINA, PACIFICA) and subtracted the effects of several processes: evaporation and precipitation, river discharge, and nutrient uptake and remineralization. The remaining variation in alkalinity exhibits a robust and coherent pattern including features of large amplitude and spatial... |
| Tipo: Text |
Palavras-chave: Alkalinity; Calcium carbonate; Biogeochemical cycles; Tracers. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00292/40367/83011.pdf |
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| Burge, Colleen A.; Reecez, Kimberly S.; Dhar, Arun K.; Kirkland, Peter; Morga, Benjamin; Degremont, Lionel; Faury, Nicole; Wippel, Bryanda J. T.; Macintyre, Alanna; Friedman, Carolyn S.. |
| Economically devastating mortality events of farmed and wild shellfish due to infectious disease have been reported globally. Currently, one of the most significant disease threats to Pacific oyster Crassostrea gigas culture is the ostreid herpesvirus 1 (OsHV-1), in particular the emerging OsHV-1 microvariant genotypes. OsHV-1 microvariants (OsHV-1 mu vars) are spreading globally, and concern is high among growers in areas unaffected by OsHV-1. No study to date has compared the relative virulence among variants. We provide the first challenge study comparing survival of naive juvenile Pacific oysters exposed to OsHV-1 mu vars from Australia (AUS mu var) and France (FRA mu var). Oysters challenged with OsHV-1 mu vars had low survival (2.5%a exposed to AUS... |
| Tipo: Text |
Palavras-chave: Ostreid herpesvirus 1; Microvariant; OsHV-1 mu vars; POMS; Pacific oyster; Crassostrea gigas; Viral disease; QPCR; Alkalinity; Emerging infectious diseases. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00631/74277/73889.pdf |
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| Souza,Carine de F.; Pereira Junior,Waterloo; Garcia,Luciano de O.; Santos,Felipe C. dos; Baldisserotto,Bernardo. |
| ABSTRACT This study analyzed the relationship between several water quality parameters (pH, hardness, alkalinity, turbidity, iron and manganese) levels measured over a 16 year period with fish distribution and aquaculture in the state of Rio Grande do Sul, Southern Brazil. The mean pH values were within a neutral range (6.5-7.5), but the maximum and minimum values reached inappropriate levels for fish farming in some cities. Alkalinity levels were very low (except in the southwest region of the state), which may have contributed to pH variation. Hardness, turbidity, iron (except the region near Caçapava do Sul City) and manganese were within safe ranges for fish farming; however, turbidity levels occasionally increased to levels outside the safe range. In... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alkalinity; Hardness; Iron; PH; Turbidity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300205 |
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| Elageed, Salma. |
| Based on data obtained during the Geochemical Ocean Section Study (GEOSECS)1977, Mer Rouge (MEROU) 1982, and US Joint Global Ocean Flux (JGOFS)1995 studies we have analyzed the processes controlling the total alkalinity (TA) of the whole water column in the Arabian Sea and the Red Sea. The main processes important for the TA variability in area of study are salinity variations, soft tissue production, calcium carbonate formation and dissolution, and sedimentation. For the subsurface waters different processes dominate in the different basins. Regarding spatial variations in surface TA, maximum values occur in the Red Sea and minimum in the upwelling region along the Omani coast in the Arabian Sea. These variations are mainly associated with physical... |
| Tipo: Theses and Dissertations |
Palavras-chave: Alkalinity; Salinity; Sedimentation. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4549 |
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| Montalvo, J. F.; García, I.; Esponda, S.C.,; Cesar, M.E.; Alburquerque, O.. |
| Se realizaron cinco muestreos entre enero de 2007 y junio de 2008 a la zona costera del municipio Playa, con el fin de evaluar los contenidos de los compuestos del ciclo del carbono. Los parámetros estudiados en la matriz agua fueron carbón orgánico, pH, alcalinidad total, alcalinidad al carbonato, dióxido de carbono total, dióxido de carbono libre, presión parcial de CO2, y contenidos de bicarbonato y carbonato. Los compuestos de carbono orgánico e inorgánico tuvieron una distribución muy heterogénea, los valores de pH (8,24±0,22) y alcalinidad total (2523±119 μmol/kg) indican que el área tiene un comportamiento alcalino, estos montos fueron similares a los encontrados en aguas de la plataforma marina cubanos y superiores a los consignados para el... |
| Tipo: Journal Contribution |
Palavras-chave: Carbon dioxide; Alkalinity; Carbon cycle; Carbon dioxide; Alkalinity; Carbon cycle; Http://aims.fao.org/aos/agrovoc/c_1302; Http://aims.fao.org/aos/agrovoc/c_8721; Http://aims.fao.org/aos/agrovoc/c_17299. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3390 |
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| Registros recuperados: 11 | |
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