Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 126, Issue -, Pages 28-36Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2017.09.019
Keywords
Food waste; Anaerobic digestion; Lipid inhibition; Bacterial pretreatment; Waste cooking oil
Funding
- National Natural Science Foundation [31470224, 31400430]
- MOST international cooperation [2014DFA91340]
- Gansu Provincial International Cooperation [1504WKCA089-2]
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High content of lipid in food waste (FW) often causes inhibition on anaerobic digestion (AD) and methane production. To facilitate the transformation of oily FW to biogas, a bacterial strain Klebsiella pneumoniae sp. LZU10 (hereafter LZU10) which could degrade waste cooking oil to soluble chemical oxygen demand (sCOD) was isolated from restaurant FW-contaminated soil. The strain also demonstrated high resistance to heavy metals, whose level were found elevated in FW. Thus LZU10 was used to pretreat FW prior to anaerobic co-digestion (coAD) with straw. Results showed that after pretreatment by LZU10 the lipid content decreased from 59.6% to 39.5%, and sCOD increased by 25.03%. The methane production and methane recovery rate were increased by 41% and 58%, respectively, after pretreatment with LZU10, compared with those of untreated FW. The present study suggests that pretreatment of lipid-rich FW with lipolytic bacteria is a promising solution to reduce lipid inhibition and enhance methane production. (C) 2017 Elsevier Ltd. All rights reserved.
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