Multivariate insights into enhanced biogas production in thermophilic dry anaerobic co-digestion of food waste with kitchen waste or garden waste: Process properties, microbial communities and metagenomic analyses
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作者
Zhang, Siying; Xiao, Mengyao; Liang, Chengyu; Chui, Chunmeng; Wang, Na; Shi, Jiping; Liu, Li
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刊物名称
BIORESOURCE TECHNOLOGY
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年、卷、文献号
2022, 361, 0960-8524
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关键词
Zhang, Siying; Xiao, Mengyao; Liang, Chengyu; Chui, Chunmeng; Wang, Na; Shi, Jiping; Liu, Li
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摘要
Multisubstrate synergetic anaerobic co-digestion can effectively overcome low efficiency of food waste (FW) mono-digestion. This study investigated the effect of supplementing FW with kitchen waste (KW) or garden waste (GW) on thermophilic dry anaerobic co-digestion. FW-KW and FW-GW co-digestion enhanced biogas production by 24.69 % and 44.96 % at organic loading rate (OLR) of 3 g VS L-1 d(-1), and increased OLR tolerance from 3 to 4 g VS L-1 d(-1) through mitigating ammonia nitrogen inhibition and volatile fatty acids accumulation. Co-digestion enriched the dominant hydrolytic bacteria Defluviitoga, resulting in an acceleration of substrate hydrolysis. FW-KW co-digestion improved biogas production by increasing gene abundance related to key enzymes in methanogenesis pathways and promoting the conversion of intermediate products into methane. FW-GW co-digestion enhanced biogas production by enriching ABC transporters-associated genes, leading to efficient substrate utilization. This study provides a promising approach for FW treatment with multivariate insights into thermophilic dry anaerobic co-digestion.
