High-rate anaerobic hydrolysis and acidogenesis of sewage sludge in a modified upflow reactor

Continuous experiments were conducted to study the hydrolysis and acidogenesis of sewage sludge in an upflow reactor with an agitator and a gas-liquid-solid separator. Results of this study showed that 34-78% of volatile suspended solids (VSS) in sewage sludge was hydrolyzed at pH in the range 4.0-6...

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Veröffentlicht in:Water science and technology 2003-01, Vol.48 (4), p.69-75
Hauptverfasser: YU, H.-Q, ZHENG, X.-J, HU, Z.-H, GU, G.-W
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HU, Z.-H
GU, G.-W
description Continuous experiments were conducted to study the hydrolysis and acidogenesis of sewage sludge in an upflow reactor with an agitator and a gas-liquid-solid separator. Results of this study showed that 34-78% of volatile suspended solids (VSS) in sewage sludge was hydrolyzed at pH in the range 4.0-6.5, 35 degrees C and 4-24 hours of hydraulic retention time (HRT). About 31-65% of carbohydrate in sewage sludge, 20-45% of protein and 14-24% of lipid were acidified in this reactor. Hydrogen production was favored in lower pH and HRT, whereas methane production was encouraged at higher pH and HRT. Acetate, propionate, butyrate, and i-butyrate were the main aqueous acidogenic products. The distribution of these compounds in the effluent was more sensitive to pH, but was less sensitive to HRT. The maximu specific COD solubilization rate and specific volatile fatty acids production rate were 126 mg-COD/g-VSS x d and 102 mg-VFAIg-VSS x d, respectively. Compared with a CSTR, this modified upflow reactor was shown to be a more promising biosystem for the hydrolysis and acidogenesis of sewage sludge.
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Results of this study showed that 34-78% of volatile suspended solids (VSS) in sewage sludge was hydrolyzed at pH in the range 4.0-6.5, 35 degrees C and 4-24 hours of hydraulic retention time (HRT). About 31-65% of carbohydrate in sewage sludge, 20-45% of protein and 14-24% of lipid were acidified in this reactor. Hydrogen production was favored in lower pH and HRT, whereas methane production was encouraged at higher pH and HRT. Acetate, propionate, butyrate, and i-butyrate were the main aqueous acidogenic products. The distribution of these compounds in the effluent was more sensitive to pH, but was less sensitive to HRT. The maximu specific COD solubilization rate and specific volatile fatty acids production rate were 126 mg-COD/g-VSS x d and 102 mg-VFAIg-VSS x d, respectively. Compared with a CSTR, this modified upflow reactor was shown to be a more promising biosystem for the hydrolysis and acidogenesis of sewage sludge.</description><subject>Acetates</subject><subject>Acetic acid</subject><subject>Acid production</subject><subject>Acidification</subject><subject>Applied sciences</subject><subject>Bacteria, Anaerobic - physiology</subject><subject>Biological and medical sciences</subject><subject>Biological treatment of sewage sludges and wastes</subject><subject>Bioreactors</subject><subject>Biotechnology</subject><subject>Carbohydrates</subject><subject>Environment and pollution</subject><subject>Exact sciences and technology</subject><subject>Fatty acids</subject><subject>Fatty Acids, Volatile - analysis</subject><subject>Fatty Acids, Volatile - chemistry</subject><subject>Fundamental and applied biological sciences. 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Results of this study showed that 34-78% of volatile suspended solids (VSS) in sewage sludge was hydrolyzed at pH in the range 4.0-6.5, 35 degrees C and 4-24 hours of hydraulic retention time (HRT). About 31-65% of carbohydrate in sewage sludge, 20-45% of protein and 14-24% of lipid were acidified in this reactor. Hydrogen production was favored in lower pH and HRT, whereas methane production was encouraged at higher pH and HRT. Acetate, propionate, butyrate, and i-butyrate were the main aqueous acidogenic products. The distribution of these compounds in the effluent was more sensitive to pH, but was less sensitive to HRT. The maximu specific COD solubilization rate and specific volatile fatty acids production rate were 126 mg-COD/g-VSS x d and 102 mg-VFAIg-VSS x d, respectively. Compared with a CSTR, this modified upflow reactor was shown to be a more promising biosystem for the hydrolysis and acidogenesis of sewage sludge.</abstract><cop>London</cop><pub>IWA</pub><pmid>14531424</pmid><doi>10.2166/wst.2003.0224</doi><tpages>7</tpages></addata></record>
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subjects Acetates
Acetic acid
Acid production
Acidification
Applied sciences
Bacteria, Anaerobic - physiology
Biological and medical sciences
Biological treatment of sewage sludges and wastes
Bioreactors
Biotechnology
Carbohydrates
Environment and pollution
Exact sciences and technology
Fatty acids
Fatty Acids, Volatile - analysis
Fatty Acids, Volatile - chemistry
Fundamental and applied biological sciences. Psychology
Hydraulic retention time
Hydrogen production
Hydrogen-Ion Concentration
Hydrolysis
Industrial applications and implications. Economical aspects
Lipids
Other industrial wastes. Sewage sludge
Oxygen - analysis
Oxygen - chemistry
pH effects
Pollution
Propionic acid
Proteins
Reactors
Retention time
Sewage
Sewage - chemistry
Sewage disposal
Sewage sludge
Sludge
Solubilization
Suspended particulate matter
Suspended solids
Volatile fatty acids
Waste Disposal, Fluid - methods
Wastes
title High-rate anaerobic hydrolysis and acidogenesis of sewage sludge in a modified upflow reactor
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