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Kim, Jaai
School of Urban and Environmental Engineering
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Anaerobic co-digestion of high-strength organic wastes pretreated by thermal hydrolysis

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Title
Anaerobic co-digestion of high-strength organic wastes pretreated by thermal hydrolysis
Author
Choi, GyucheolKim, JaaiLee, SeungyongLee, Changsoo
Keywords
Anaerobic digestion; Hydrogen sulfide; Microbial community structure; Pretreatment; Thermal hydrolysis
Issue Date
201806
Publisher
ELSEVIER SCI LTD
Citation
BIORESOURCE TECHNOLOGY, v.257, no., pp.238 - 248
Abstract
Thermal hydrolysis (TH) pretreatment was investigated for the anaerobic digestion (AD) of a mixture of high-strength organic wastes (i.e., dewatered human feces, dewatered sewage sludge, and food wastewater) at laboratory scale to simulate a full-scale plant and evaluate its feasibility. The reactors maintained efficient and stable performance at a hydraulic retention time of 20 days, which may be not sufficient for the mesophilic AD of high-suspended-solid wastes, despite the temporal variations in organic load. The addition of FeCl3 was effective in controlling H2S and resulted in significant changes in the microbial community structure, particularly the methanogens. The temporary interruption in feeding or temperature control led to immediate performance deterioration, but it recovered rapidly when normal operations were resumed. The overall results suggest that the AD process coupled with TH pretreatment can provide an efficient, robust, and resilient system to manage high-suspended-solid wastes, supporting the feasibility of its full-scale implementation.
URI
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DOI
http://dx.doi.org/10.1016/j.biortech.2018.02.090
ISSN
0960-8524
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