期刊
RENEWABLE ENERGY
卷 163, 期 -, 页码 357-367出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.09.006
关键词
Co-digestion; Potato pulp waste; Dairy manure; Biochar; Methane production; Microbial community
资金
- national key research and development plan modern food processing and food storage and transportation technology and equipment [2017YFD0400204]
- National Natural Science Foundation of China [31571963]
This study found that digesters with high feed-to-inoculum ratios without biochar can lead to process failure, but the addition of biochar and/or co-digestion can improve digestion efficiency. Biogas and methane yields were significantly higher in digesters with biochar compared to those without. The maximum biogas and methane yields were achieved with specific feed-to-inoculum and waste to manure ratios, as well as biochar addition.
Potato pulp waste is a potential biomass material and easily acidified substrate for anaerobic digestion. The present study evaluated the methane yield and microbial community resulted from biochar amendment for the co-digestion of potato pulp waste and dairy manure at different feed-to-inoculum ratios (2:1, 1:1, 1:2, and 1:3) and potato pulp waste to dairy manure ratios (4:0, 3:1 and 1:1). The results indicated that the digesters with a high feed-to-inoculum ratio (2:1, 1:1) and without biochar lead to volatile fatty acid accumulation and process failure, whereas the addition of biochar and/or co-digestion can increase the buffer capacity and improve the digestion efficiency. The biogas and methane yields of the digesters with biochar were 1.1-2.8 and 1.4-5.3 times higher, respectively, than those without biochar. The maximum biogas and methane yields of 476 and 200 mL/g TS, respectively, were achieved with a feed-to-inoculum ratio of 1:2, potato pulp waste to dairy manure ratio of 4:0, and biochar addition. Biochar and co-digestion can also enhance the relative abundance of the bacterial community. Methanomicrobiales and Methanosaetaceae were the main methanogens present in the anaerobic digestion of PPW. This paper provides a theoretical basis of easily acidified substrates used for biogas production. (C) 2020 Elsevier Ltd. All rights reserved.
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