Wang Binghan, Zhang Liangmao, Shi Jianhong, Su Yinglong, Wu Dong, Xie Bing
Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China; Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Science, East China Normal University, Shanghai 200241, PR China.
Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China; Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Science, East China Normal University, Shanghai 200241, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
Bioresour Technol. 2023 May;376:128926. doi: 10.1016/j.biortech.2023.128926. Epub 2023 Mar 20.
High-solids anaerobic co-digestion (HS-AcoD) of food waste (FW) and other organic wastes is an effective option to improve the biogas production and system stability compared to mono-digestion. However, the clean and sustainable HS-AcoD strategy for FW and associated microbial functional traits have not been well explored. Here, HS-AcoD of restaurant food waste (RFW), household food waste (HFW) and rice straw (RS) were performed. Results showed that the maximum synergy index (SI) of 1.28 were achieved when the volatile solids ratio of RFW, HFW and RS was 0.45:0.45:0.1. HS-AcoD alleviated the acidification process by regulating metabolism associated with hydrolysis and volatile fatty acids formation. The synergistic relationship between syntrophic bacteria and Methanothrix sp., and the enhanced metabolic capacity associated with the acetotrophic and hydrogenotrophic pathways dominated by Methanothrix sp., provided a further explanation of the synergistic mechanism. These findings advance the knowledge about microbial mechanisms underlying the synergistic effect of HS-AcoD.
与单一消化相比，食物垃圾（FW）与其他有机废物的高固体厌氧共消化（HS-AcoD）是提高沼气产量和系统稳定性的有效选择。然而，针对食物垃圾的清洁且可持续的HS-AcoD策略以及相关的微生物功能特性尚未得到充分探索。在此，进行了餐厅食物垃圾（RFW）、家庭食物垃圾（HFW）和稻草（RS）的HS-AcoD实验。结果表明，当RFW、HFW和RS的挥发性固体比例为0.45:0.45:0.1时，实现了最大协同指数（SI）为1.28。HS-AcoD通过调节与水解和挥发性脂肪酸形成相关的代谢来缓解酸化过程。互营细菌与甲烷丝状菌之间的协同关系，以及由甲烷丝状菌主导的与乙酸营养型和氢营养型途径相关的代谢能力增强，进一步解释了协同机制。这些发现推进了关于HS-AcoD协同效应背后微生物机制的认识。
