期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 316, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.115264
关键词
Anaerobic co-digestion; Chicken manure; Corn straw; High-throughput qPCR; Bacterial community
资金
- Natural Science Foundation of Hebei [E2020402058]
- National Natural Science Foundation of China [41907206]
- Australian Government Cooperative Research Centres Projects [CRCPSEVEN000149]
- Australia-China Joint Research Centre of Healthy Soils for Sustainable Food Production and Environmental Quality [ACSRF48165]
This study investigated the effect of different TS levels on the relative cumulative methane production during anaerobic co-digestion. The results showed that 15% TS level reduced ammonia nitrogen release, increased the abundance of specific bacteria, and improved methane production.
Total solid content (TS) is an important factor for biogas production during anaerobic digestion. In this study, we explored the influence of different TS (5% wet, 15% semi-solid and 25% solid state) on the relative cumulative methane production (RCMP) during anaerobic co-digestion of chicken manure with corn straw. Results showed that total ammonium nitrogen and free ammonia nitrogen concentration increased with the increase of TS. Ammonium nitrogen in treatments at 15% TS was 2.25-2.76 times as high as that at 5% TS, which was below 3 times. The highest chemical oxygen demand removal and RCMP were obtained in the treatment of 15% TS with a ratio of 2:1 chicken manure: corn straw (based on TS). The RCMP in the treatments of 15% TS were 3.63-4.59 times higher than that of 5% TS based on the volume of substrates. The abundance of Caldicoprobacter improving the degradation of corn straw was significantly positively correlated with the RCMP, and the average abundance of Caldicoprobacter at 15% TS was 8.33 and 7.02 times higher than that at 5% and 25% TS, respectively. Structural equation models analysis suggested that TS significantly impacted the RCMP by indirectly impacting free ammonia nitrogen and microbial abundance. These findings indicated semi-solid state (15% TS) decreased ammonia nitrogen releasing and improved the abundance of Caldicoprobacter, and increased RCMP during anaerobic co-digestion of chicken manure with corn straw.
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