Effect of micro-oxygen pretreatment on gas production characteristics of anaerobic digestion of kitchen waste
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ORIGINAL ARTICLE
Effect of micro‑oxygen pretreatment on gas production characteristics of anaerobic digestion of kitchen waste Xiaofei Zhen1 · Xiaoyan Zhang1 · Shuaibing Li1 · Mingche Li1 · Jian Kang2 Received: 9 January 2020 / Accepted: 3 June 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract Micro-oxygen pretreatment of kitchen waste was done to improve the gas production efficiency of anaerobic fermentation and shorten the fermentation cycle of kitchen waste. The results demonstrated that with an oxygen supply of 20 mL, the peak gas production increased from 498 to 601 mL, and the theoretical gas production increased by 4.5 mL/g VS (volatiles solid) compared with those of the control group R1–R4. The anaerobic fermentation entered the late stage on day 25, which was 13 days earlier than that of the control group. The chemical oxygen demand and ammonia nitrogen contents in the treatment groups of R1–R4 were relatively stable. An oxygen supply of 20 mL was conducive to stimulating the facultative anaerobes, promoting the decomposition of nitrogenous compounds and organic matter, and improving the anaerobic fermentation efficiency. A lesser amount of oxygen (≤ 15 mL) was unable to effectively improve the gas production efficiency of anaerobic fermentation, although it exerted a certain inhibitory effect on anaerobic fermentation. Keywords Micro-oxygen pretreatment · Kitchen waste · Gas production characteristics · Anaerobic digestion
Introduction With the continuous improvement in people’s living standards in China, the output of kitchen waste has also gradually increased. Kitchen waste has brought serious environmental pollution issues and a huge waste of resources. As a utilizable resource with rich organic matter (OM), kitchen waste Xiaofei Zhen, Xiaoyan Zhang, Shuaibing Li, Mingche Li and Jian Kang have equally contributed to this article. * Xiaoyan Zhang [email protected] Xiaofei Zhen [email protected] Shuaibing Li [email protected] Mingche Li [email protected] Jian Kang [email protected] 1
School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2
is gaining more and more attention [1, 2]. Anaerobic fermentation is an approach to achieve reuse, reduce and recycle. The reaction is mainly divided into three stages, namely the hydrolytic acidification stage, the hydrogen production acetic acid stage, and the methanogenesis stage. In the hydrolytic acidification stage OM is converted into small molecule organic matter by microorganisms. The small molecule organic matter is then converted into volatile fatty acids by the hydrogen-producing and acetic acid-producing groups of bacteria, and finally C H4 is produced by the methanogens using the volatile fatty acids. Anaerobic fermentation of kitchen waste, can not only reduce the OM content in kitchen waste, but also produce methane as a clean energy source. In addition,
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