Operation of a slow rate anaerobic digester treating municipal secondary sludge

This study was designed to evaluate the performance of a slow rate anaerobic digester in treating secondary sewage sludge received from one local municipal wastewater treatment plant. The digester was fed by secondary sewage sludge without any previous thickening. A series of three independent batch...

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Autores principales:	Telles Benatti,Cláudia, Granhen Tavares,Célia Regina, Dias Filho,Benedito Prado, Ribeiro Moitinho,Maria da Luz
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso 2002
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300005
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spelling	oai:scielo:S0717-345820020003000052003-08-18Operation of a slow rate anaerobic digester treating municipal secondary sludgeTelles Benatti,CláudiaGranhen Tavares,Célia ReginaDias Filho,Benedito PradoRibeiro Moitinho,Maria da Luz This study was designed to evaluate the performance of a slow rate anaerobic digester in treating secondary sewage sludge received from one local municipal wastewater treatment plant. The digester was fed by secondary sewage sludge without any previous thickening. A series of three independent batch experiments was investigated at an operation time of 60 days. The total solids (TS) in the influent sludge contained a percentage of organic matter of 59, 63 and 54%, a concentration of volatile suspended solids (VSS) of 23.7, 29.2 and 27.8 g L-1 and a chemical oxygen demand (COD) of 51.8, 32.9 and 65.7 g L-1 for the three experiments, respectively. The operation of anaerobic digestion was stable, with no noticeable scum or foaming problems. The COD reduction in each experiment reached 29, 21 and 45% in the sludge and 95, 85 and 82% in the supernatant. The microbial indicators were surveyed by sampling the sludge throughout the digester operation and counting the number of bacteria in the sampled sludge. Counted bacteria included the total culturable, the total and fecal coliform groups, Pseudomonas aeruginosa and fecal streptococci. The percentage removal of the indicator bacteria was higher for fecal streptococci (99.9%) than for coliform bacteria (96.3%), which in turn was higher than for P. aeruginosa (95.6%). Parasitological analysis was also performed on multiple sludge samples by determination of protozoa and helminth eggs. Protozoa (Eimeria and Entamoeba), helminth eggs (Ascaris, Trichuris, Toxocara, Hymenolepis) and mites were detected in the influent sludge, and particularly among the helminth eggs, only Trichuris was detected in the effluent sludge.info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.5 n.3 20022002-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300005en
institution	Scielo Chile
collection	Scielo Chile
language	English
description	This study was designed to evaluate the performance of a slow rate anaerobic digester in treating secondary sewage sludge received from one local municipal wastewater treatment plant. The digester was fed by secondary sewage sludge without any previous thickening. A series of three independent batch experiments was investigated at an operation time of 60 days. The total solids (TS) in the influent sludge contained a percentage of organic matter of 59, 63 and 54%, a concentration of volatile suspended solids (VSS) of 23.7, 29.2 and 27.8 g L-1 and a chemical oxygen demand (COD) of 51.8, 32.9 and 65.7 g L-1 for the three experiments, respectively. The operation of anaerobic digestion was stable, with no noticeable scum or foaming problems. The COD reduction in each experiment reached 29, 21 and 45% in the sludge and 95, 85 and 82% in the supernatant. The microbial indicators were surveyed by sampling the sludge throughout the digester operation and counting the number of bacteria in the sampled sludge. Counted bacteria included the total culturable, the total and fecal coliform groups, Pseudomonas aeruginosa and fecal streptococci. The percentage removal of the indicator bacteria was higher for fecal streptococci (99.9%) than for coliform bacteria (96.3%), which in turn was higher than for P. aeruginosa (95.6%). Parasitological analysis was also performed on multiple sludge samples by determination of protozoa and helminth eggs. Protozoa (Eimeria and Entamoeba), helminth eggs (Ascaris, Trichuris, Toxocara, Hymenolepis) and mites were detected in the influent sludge, and particularly among the helminth eggs, only Trichuris was detected in the effluent sludge.
author	Telles Benatti,Cláudia Granhen Tavares,Célia Regina Dias Filho,Benedito Prado Ribeiro Moitinho,Maria da Luz
spellingShingle	Telles Benatti,Cláudia Granhen Tavares,Célia Regina Dias Filho,Benedito Prado Ribeiro Moitinho,Maria da Luz Operation of a slow rate anaerobic digester treating municipal secondary sludge
author_facet	Telles Benatti,Cláudia Granhen Tavares,Célia Regina Dias Filho,Benedito Prado Ribeiro Moitinho,Maria da Luz
author_sort	Telles Benatti,Cláudia
title	Operation of a slow rate anaerobic digester treating municipal secondary sludge
title_short	Operation of a slow rate anaerobic digester treating municipal secondary sludge
title_full	Operation of a slow rate anaerobic digester treating municipal secondary sludge
title_fullStr	Operation of a slow rate anaerobic digester treating municipal secondary sludge
title_full_unstemmed	Operation of a slow rate anaerobic digester treating municipal secondary sludge
title_sort	operation of a slow rate anaerobic digester treating municipal secondary sludge
publisher	Pontificia Universidad Católica de Valparaíso
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300005
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Operation of a slow rate anaerobic digester treating municipal secondary sludge

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