Internal enhancement mechanism of biochar with graphene structure in anaerobic digestion: The bioavailability of trace elements and potential direct interspecies electron transfer

被引:97
作者
Qi, Qiuxian [1 ]
Sun, Chen [4 ]
Zhang, Jingxin [1 ]
He, Yiliang [1 ,5 ]
Tong, Yen Wah [2 ,3 ]
机构
[1] Shanghai Jiao Tong Univ, China UK Low Carbon Coll, Shanghai 201306, Peoples R China
[2] Natl Univ Singapore, Environm Res Inst, Singapore, Singapore
[3] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore, Singapore
[4] Jiaxing Univ, Coll Biol Chem Sci & Engn, Jiaxing 314001, Zhejiang, Peoples R China
[5] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai, Peoples R China
基金
中国国家自然科学基金; 新加坡国家研究基金会;
关键词
Anaerobic Digestion; Biochar; Enzyme; Ethanol; DIET; FOOD WASTE; PYROLYSIS; ENZYME; SLUDGE; BACTERIA; BIOMASS; YIELD; IRON;
D O I
10.1016/j.cej.2020.126833
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The main aim of the work is to understand the internal mechanism of biochar improving anaerobic digestion (AD) performance. This study evaluated the impact of biochar produced at 400 degrees C and 900 degrees C pyrolysis on the AD performance. The results indicated that the methane content increased from an inhibited value of around 60% in the control group to the theoretical value of 75% in the reactor with biochar produced at 900 degrees C pyrolysis, and the specific methane production increased to 725 mL/g VS/d. The bioavailability of trace elements (TEs) including Fe, Co and Ni was enhanced with the addition of biochar. Correspondingly, enzymatic activity test and metagenomic analysis signified the abundance of the enzyme gene as well as enzyme activity increased with the enhancement of the bioavailability of TEs by biochar. According to the metagenomic analysis of the microbial community and the metabolism pathway, Pseudomonas could participate in direct interspecies electron transfer (DIET) with Methanosaeta via biochar with graphene structure as an electron contact through carbon dioxide reduction so as to heighten methane metabolism. The obtained findings may provide new insight into the internal enhancement mechanism between enzymes as well as the bioavailability of TEs by biochar.
引用
收藏
页数:11
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