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Registros recuperados: 5
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Biofilm formation for organic matter and sulphate removal in gas-lift reactors Electron. J. Biotechnol.
Pizarro,Carolina; Donoso-Bravo,Andrés; Jeison,David; Ruiz-Filippi,Gonzalo; Chamy,Rolando.
A start-up strategy was presented and evaluated to obtain a well-established biofilm in a gas lift-reactor capable both for the removal of organic matter and sulphate. Pumice stone was used as material support. The influence of shear forces, given by the biogas recirculation, the effect of the COD/SO4-2 ratio and the OLRs increase were evaluated on the reactor performance. From the first stages, cell colonization was observed along with the presence of extracellular polymeric substances. The COD and sulphate removal was over 70%, for all conditions. The increase of gas flow did not have an adverse effect on biofilm development even though there was some detachment. Specific methanogenic activity of the biofilm increased along the experiments. Operational...
Tipo: Journal article Palavras-chave: Anaerobic biofilm; Gas-lift reactors; Sulphate; Start-up.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000400003
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Effect of sulphate concentration and sulphide desorption on the combined removal of organic matter and sulphate from wastewaters using expanded granular sludge bed (EGSB) reactors Electron. J. Biotechnol.
Valdés,Freddy; Muñoz,Edmundo; Chamy,Rolando; Ruiz,Gonzalo; Vergara,Christian; Jeison,David.
During the application of anaerobic processes to high sulphate concentration wastewaters, operational problems are expected due to the occurrence of sulphate reduction. Sulphide production reduces effluent quality and may produce inhibition. The application of Expanded Granular Sludge Bed (EGSB) reactors for the combined removal of organic matter and sulphate was studied at different COD/sulphate and 3 values of pH. During the EGSB reactor operation, most of the sulphide remains in the liquid phase reducing effluent quality. The inclusion of a desorption column in the recirculation of the EGSB reactor promotes mass transfer to the gas phase, reducing the sulphide concentration in the liquid phase, significantly decreasing the chemical oxygen demand of the...
Tipo: Journal article Palavras-chave: Anaerobic digestion; EGSB; Sulphate reduction; Sulphide.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000400004
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Improved sanitary landfill design using recirculation of anaerobically treated leachates: generation of advanced design criteria Electron. J. Biotechnol.
Schiappacasse,María Cristina; Palma,Juan; Poirrier,Paola; Ruiz-Filippi,Gonzalo; Chamy,Rolando.
In Latin Americ a, the most accepted disposal systems for Municipal Solid Waste (MSW) are landfills, which nowadays have low rates of stabilization. The objective of this study was to develop design criteria for sanitary landfills which lead to a reduction in the stabilization times of MSW, based on experiment results obtain from a pre-pilot scale operation of two sanitary landfills (0.5 Ton), one with recirculation of leachates treated in an anaerobic digester and the other with recirculation of untreated leachates. This was complemented by another pilot scale sanitary landfill (1440 Ton) with recirculation of leaches treated in an anaerobic filter, and additionally by a computer simulation of leachate generation through the water balance of a theoretical...
Tipo: Journal article Palavras-chave: Hydrological balance; Landfill; Leachate recycle; Municipal solid waste; Stabilization.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000300009
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Simultaneous effects of pH and substrate concentration on hydrogen production by acidogenic fermentation Electron. J. Biotechnol.
Cubillos,Genoveva; Arrué,Ramon; Jeison,David; Chamy,Rolando; Tapia,Estela; Rodríguez,Jorge; Ruiz-Filippi,Gonzalo.
The present research examined the effects of initial substrate concentration and pH on the yield and productivity of hydrogen production by acidogenic fermentation. Assays were carried out at three different initial pH levels (5.5, 6.5 and 7.5) and three initial substrate concentrations (3, 5 and 10 g COD/L). Glucose was used as carbon source and the experiments were conducted at 37°C in batch tests, after a thermal pretreatment to eliminate methanogenic microorganisms. Conversions of glucose into hydrogen were between 16.75 and 27.25% of theoretical maximum, and high values of hydrogen productivity were obtained. An optimum value for the yield of glucose between initial pH of 6.3 and 3.7 g COD/L and productivity of the 5.95 H2/gVSS h and initial pH of 6.7...
Tipo: Journal article Palavras-chave: Acidogenic; Gompertz modified; Heat treatment; Hydrogen; Surface response.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100011
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Treatment of low strength sewage with high suspended organic matter content in an anaerobic sequencing batch reactor and modeling application Electron. J. Biotechnol.
Donoso-Bravo,Andrés; Carballa,Marta; Ruiz- Filippi,Gonzalo; Chamy,Rolando.
In this work, an anaerobic sequencing batch reactor (ASBR) was operated for 8 months to treat low strength sewage with high suspended organic matter content. Three phases of operation with increasing organic loading rates (OLR) were performed: 0.4 kg COD/m³ x d (phase I), 0 .8 kg COD/m³ x d (phase II) and 1.2 kg COD/m³ x d (phase III). Adequate stability parameters (pH, total alkalinity) were obtained through all three experimental phases. During phases I and II, the removal efficiencies of organic matter (expressed as total chemical oxygen demand (COD) and total suspended solids ranged between 50-60%. However, these values decreased to 15-25% in phase III. In addition, a non-complex model, including hydrolysis, acidogenesis and methanogenesis, was applied...
Tipo: Journal article Palavras-chave: Acidogenesis; Anaerobic treatment; Hydrolysis; Low strength wastewater; Modeling.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300013
Registros recuperados: 5
Primeira ... 1 ... Última
 

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