Klebsiella pneumoniae sp. LZU10 degrades oil in food waste and enhances methane production from co-digestion of food waste and straw
2017
Liu, Pu | Ji, Jing | Wu, Qi | Ren, Jun | Wu, Gaofeng | Yu, Zhengsheng | Xiong, Jian | Tian, Fake | Zafar, Yusuf | Li, Xiangkai
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.
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