Effect of low solids retention time and focused pulsed pre-treatment on anaerobic digestion of waste activated sludge

Il Su Lee; Bruce Rittmann

doi:10.1016/j.biortech.2010.11.082

Effect of low solids retention time and focused pulsed pre-treatment on anaerobic digestion of waste activated sludge

Il Su Lee, Bruce Rittmann

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

The interacting effects of Focused Pulsed (FP) treatment and solids retention time (SRT) were evaluated in laboratory-scale digesters operated at SRTs of 2-20days. Anaerobic digestion and methanogenesis of waste activated sludge (WAS) were stable for SRT≥5days, but the effluent soluble organic compounds increased significantly for SRT=2days due to a combination of faster hydrolysis kinetics and washout of methanogens. FP treatment increased the CH₄ production rate and TCOD removal efficiency by up to 33% and 18%, respectively, at a SRT of 20days. These effects were the result of an increase in the hydrolysis rate, since the concentrations of soluble components remained low for SRT≥5days. Alternately, FP pre-treatment of WAS allowed the same conversion of TCOD to CH₄ with a smaller SRT and digester size: e.g., 40% size savings with a CH₄ conversion of 0.23g CH₄-COD/g COD_in.

Original language	English (US)
Pages (from-to)	2542-2548
Number of pages	7
Journal	Bioresource Technology
Volume	102
Issue number	3
DOIs	https://doi.org/10.1016/j.biortech.2010.11.082
State	Published - Feb 1 2011

Keywords

Focused Pulsed (FP)
Hydrolysis
Methanogenesis
Pre-treatment
SRT

ASJC Scopus subject areas

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

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10.1016/j.biortech.2010.11.082

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title = "Effect of low solids retention time and focused pulsed pre-treatment on anaerobic digestion of waste activated sludge",

abstract = "The interacting effects of Focused Pulsed (FP) treatment and solids retention time (SRT) were evaluated in laboratory-scale digesters operated at SRTs of 2-20days. Anaerobic digestion and methanogenesis of waste activated sludge (WAS) were stable for SRT≥5days, but the effluent soluble organic compounds increased significantly for SRT=2days due to a combination of faster hydrolysis kinetics and washout of methanogens. FP treatment increased the CH4 production rate and TCOD removal efficiency by up to 33% and 18%, respectively, at a SRT of 20days. These effects were the result of an increase in the hydrolysis rate, since the concentrations of soluble components remained low for SRT≥5days. Alternately, FP pre-treatment of WAS allowed the same conversion of TCOD to CH4 with a smaller SRT and digester size: e.g., 40% size savings with a CH4 conversion of 0.23g CH4-COD/g CODin.",

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AU - Rittmann, Bruce

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N2 - The interacting effects of Focused Pulsed (FP) treatment and solids retention time (SRT) were evaluated in laboratory-scale digesters operated at SRTs of 2-20days. Anaerobic digestion and methanogenesis of waste activated sludge (WAS) were stable for SRT≥5days, but the effluent soluble organic compounds increased significantly for SRT=2days due to a combination of faster hydrolysis kinetics and washout of methanogens. FP treatment increased the CH4 production rate and TCOD removal efficiency by up to 33% and 18%, respectively, at a SRT of 20days. These effects were the result of an increase in the hydrolysis rate, since the concentrations of soluble components remained low for SRT≥5days. Alternately, FP pre-treatment of WAS allowed the same conversion of TCOD to CH4 with a smaller SRT and digester size: e.g., 40% size savings with a CH4 conversion of 0.23g CH4-COD/g CODin.

AB - The interacting effects of Focused Pulsed (FP) treatment and solids retention time (SRT) were evaluated in laboratory-scale digesters operated at SRTs of 2-20days. Anaerobic digestion and methanogenesis of waste activated sludge (WAS) were stable for SRT≥5days, but the effluent soluble organic compounds increased significantly for SRT=2days due to a combination of faster hydrolysis kinetics and washout of methanogens. FP treatment increased the CH4 production rate and TCOD removal efficiency by up to 33% and 18%, respectively, at a SRT of 20days. These effects were the result of an increase in the hydrolysis rate, since the concentrations of soluble components remained low for SRT≥5days. Alternately, FP pre-treatment of WAS allowed the same conversion of TCOD to CH4 with a smaller SRT and digester size: e.g., 40% size savings with a CH4 conversion of 0.23g CH4-COD/g CODin.

KW - Focused Pulsed (FP)

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KW - Methanogenesis

KW - Pre-treatment

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Effect of low solids retention time and focused pulsed pre-treatment on anaerobic digestion of waste activated sludge

Abstract

Keywords

ASJC Scopus subject areas

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