Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 3, Pages 2542-2548Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.11.082
Keywords
Focused Pulsed (FP); Pre-treatment; SRT; Methanogenesis; Hydrolysis
Funding
- OpenCELRegistered
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The interacting effects of Focused Pulsed (FP) treatment and solids retention time (SRT) were evaluated in laboratory-scale digesters operated at SRTs of 2-20 days. Anaerobic digestion and methanogenesis of waste activated sludge (WAS) were stable for SRT >= 5 days, but the effluent soluble organic compounds increased significantly for SRT = 2 days 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 20 days. These effects were the result of an increase in the hydrolysis rate, since the concentrations of soluble components remained low for SRT >= 5 days. Alternately. FP pretreatment 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 0.23 g CH4-COD/g CODin. (C) 2010 Elsevier Ltd. All rights reserved.
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