Effects of digestate recirculation on a two-stage anaerobic digestion system, particularly focusing on metabolite correlation analysis

被引:70
作者
Wu, Chuanfu [1 ,2 ]
Huang, Qiqi [1 ]
Yu, Miao [1 ]
Ren, Yuanyuan [1 ]
Wang, Qunhui [1 ,2 ]
Sakai, Kenji [3 ]
机构
[1] Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Dept Environm Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Beijing Key Lab Resource Oriented Treatment Ind P, 30 Xueyuan Rd, Beijing 10083, Peoples R China
[3] Kyushu Univ, Fac Agr, Grad Sch, Dept Biosci & Biotechnol,Higashi Ku, 6-10-1 Hakozaki, Fukuoka 8128581, Japan
基金
中国国家自然科学基金;
关键词
Food waste; Anaerobic digestion; Two-stage digestion; Digestate recirculation; Metabolite correlation analysis; BIO-HYTHANE PRODUCTION; MUNICIPAL SOLID-WASTE; CONVERTING FOOD WASTE; TO-SUBSTRATE RATIO; CO-DIGESTION; METHANE PRODUCTION; ORGANIC FRACTION; FERMENTATION SYSTEM; DISTILLERS GRAINS; ENERGY RECOVERY;
D O I
10.1016/j.biortech.2017.12.020
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Single-stage (S-N treatment) and two-stage anaerobic digestion with (T-R treatment) and without digestate recirculation (T-N treatment) for methane production using food waste (FW) were comparatively evaluated to examine the effects of digestate recirculation on anaerobic digestion (AD). Digestate recirculation positively affected the methane yield and organic loading rate (OLR). Metabolite correlation analysis revealed that a systematic hydrolysis degree of greater than 75% is crucial to achieve the complete recoverable yield of methane from FW. Digestate recirculation also markedly increased the system alkalinity, maintaining an optimum pH for methanogens. However, the ammonium accumulated by T-R treatment would destroy the metabolic balance between the hydrolytic bacteria and methanogens, especially at a critical OLR. Therefore, the appropriate control of two-stage AD systems with digestate recirculation is limited not only to OLR regulation but also to the prevention of ammonium accumulation.
引用
收藏
页码:40 / 48
页数:9
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