Alleviating acid inhibition via bentonite supplementation during acidulated swine manure anaerobic digestion: Performance enhancement and microbial mechanism analysis

被引：10
作者：
Hu, Fengping [1 ]
Zhang, Shihao [1 ]
Liu, Susu [1 ]
Wan, Liping [2 ]
Gong, Guijin [2 ]
Hu, Tengfang [1 ]
Wang, Xin [1 ]
Xu, Li [3 ]
Xu, Gaoping [3 ]
Hu, Yuying [1 ]
机构：
[1] East China Jiao Tong Univ, Sch Civil Engn & Architecture, Nanchang 330013, Peoples R China
[2] Zhenghe Environm Protect Grp, Nanchang 330013, Peoples R China
[3] JiangXi Water Sci Detecting & Researching Co Ltd, Jingdezhen 333000, Peoples R China
来源：
CHEMOSPHERE | 2023年 / 313卷
基金：
中国国家自然科学基金;
关键词：
Acidulated swine manure; Anaerobic digestion; Bentonite; Performance; Stability; COMMUNITY STRUCTURE; FOOD WASTE; THERMAL-TREATMENT; BIOENERGETICS; BIOGAS; SLUDGE; RATIO;
D O I：
10.1016/j.chemosphere.2022.137577
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Swine manure is usually transmitted by the "collection-storage-transport" mode of the biogas project. However, this particular application pattern results in high volatile fatty acids (VFAs) concentration due to the long transition time in the "collection-storage-transport" process. In this work, acidulated swine manure anaerobic digestion (AD) with bentonite supplementation was firstly investigated with an expectation of acid alleviation, performance enhancement and microbial mechanism. Results indicated that the methane production rate in the 20 g/L bentonite-added digester was 2.87 fold higher than that of the control digester. Chemical oxygen demand (COD) removal rate was elevated by 140.1% via bentonite supplementation. Besides, the rapid decrease of VFAs and ammonia indicated that bentonite supplementation could offer buffering capacity and alleviate acid inhi-bition. Microbial community analysis revealed that acetoclastic methanogenesis (Methanosaeta and Meth-anosarcina) was the predominant methanogenesis pathway in this AD system. Syntrophic acetate oxidation (SAO) bacteria were discovered in the bentonite-added digester, and they converted acetate into H2/CO2 to support hydrogenotrophic methanogenesis. This study could offer guidance for acidulated swine manure AD in the practical biogas project.
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页数：8
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