Long-term high-solids anaerobic digestion of food waste: Effects of ammonia on process performance and microbial community

被引：121

作者：

Peng, Xuya ^{[1
]}

Zhang, ShangYi ^{[1
]}

Li, Lei ^{[1
]}

Zhao, Xiaofei ^{[1
]}

Ma, Yao ^{[1
]}

Shi, Dezhi ^{[1
]}

机构：

[1] Chongqing Univ, Minist Educ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Chongqing 400045, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2018年 / 262卷

基金：

中国国家自然科学基金;

关键词：

Food waste; High-solids anaerobic digestion; Ammonia inhibition; Microbial community; Process performance; CO-DIGESTION; ARCHAEAL COMMUNITIES; VEGETABLE WASTE; CHICKEN MANURE; BIOGAS PLANT; INHIBITION; FERMENTATION; BACTERIAL; SLUDGE; STRESS;

D O I：

10.1016/j.biortech.2018.04.076

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

A long-term high solids anaerobic digestion of food waste was conducted to identify microbial mechanisms of ammonia inhibition during digestion and to clarify correlations between ammonia accumulation, microbial community dynamics (diversity, composition, and interactions), and process stability. Results show that the effects of ammonia on process performance and microbial community were indirectly caused by volatile fatty acid accumulation. Excess free ammonia blocked acetate metabolism, leading to process instability. Accumulated acetate caused feedback inhibition at the acetogenesis stage, which resulted in considerable accumulation of propionate, valerate, and other long-chain fatty acids. This high concentration of volatile fatty acids reduced the abundance of syntrophic acetogenic bacteria and allowed hydrolytic fermentative bacteria to dominate. The normally interactive and orderly metabolic network was broken, which further exacerbated the process instability. These results improve the understanding of microbial mechanisms which contribute to process instability and provide guidance for the microbial management of anaerobic digesters.

引用

页码：148 / 158

页数：11

共 38 条

[1] Elucidating microbial community adaptation to anaerobic co-digestion of fats, oils, and grease and food waste [J].