期刊
CHEMOSPHERE
卷 274, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.129787
关键词
Digestate recirculation; Microbial community; Rice straw; Swine manure; Thermophilic-mesophilic anaerobic co-digestion
资金
- China Hunan Provincial Science & Technology Department [2020JJ4602, 2017SK2361, S2019JJQNJJ1006]
- Major Scientific and Technological Innovation Project of Shandong Province [2019JZZY020301]
- Changsha Bureau of Science and Technology [kq2004073]
The study found that digestate recirculation improved the performance and methane production of the swine manure and rice straw co-digestion system, enhancing energy recovery and altering the microbial community structure.
The anaerobic co-digestion (coAD) of swine manure (SM) and rice straw (RS) is appealing for renewable energy recovery and waste treatment worldwidely. Improving its performance is very important for its application. In this study, long-term semi-continuous experiments were conducted to evaluate the improving effects of digestate recirculation on the performance, energy recovery, and microbial community of two-stage thermophilic-mesophilic coAD of swine manure (SM) and rice straw (RS). The experimental results indicated that the coAD systems of SM and RS (mixing ratio of 3:1) with or without digestate recirculation could not realize phase separation. The reactors of both coAD systems were characterized by pH values ranging from 7.74 to 7.85, methane production as 0.41 +/- 0.02 and 0.44 +/- 0.03 L/L/d, and stable operation. Notably, digestate recirculation increased total methane production, organic matter removal, and reaction rate of the coAD system by 9.92 +/- 5.08, 5.22 +/- 1.94, and 9.73-12.60%, respectively. Digestate recirculation improved the performance of the coAD by significantly increasing the abundance of Methanosarcina (from 4.1% to 7.5%-10.7% and 35.7%) and decreasing that of Methanothermobacter (from 94.2% to 87.3%-83.6% and 56.8%). Thus, the main methanogenesis pathway of the coAD system was changed by digestate recirculation and the methane production was effectively improved. Although the energy input of the coAD system increased by 30.26%, digestate recirculation improved the energy balance of the total system by 6.83%. (C) 2021 Elsevier Ltd. All rights reserved.
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