Wang Shi-Peng, Gao Yang, Sun Zhao-Yong, Peng Xiang-Yu, Xie Cai-Yun, Tang Yue-Qin
College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
Bioresour Technol. 2022 Nov;363:127952. doi: 10.1016/j.biortech.2022.127952. Epub 2022 Sep 12.
This study evaluated the feasibility, system stability, and microbial community succession of thermophilic semi-continuous composting of kitchen waste (KW). The results revealed that treatment performance was stable at a 10 % feeding ratio, with an organic matter (OM) degradation efficiency of 81.5 % and seed germination index (GI) of 50.0 %. Moreover, the OM degradation efficiency and GI were improved to 83.4 % and 70.0 %, respectively, by maintaining an optimal compost moisture content (50-60 %). However, feeding ratios of ≥ 20 % caused deterioration of the composter system owing to OM overloading. Microbial community analysis revealed that Firmicutes, Actinobacteria, Chloroflexi, Proteobacteria, and Gemmatimonadetes were dominant. Additionally, moisture regulation significantly increased the Proteobacteria abundance by 57.1 % and reduced the Actinobacteria abundance by 57.8 %. Moreover, network analysis indicated that the bacterial community stability and positive interactions between genera were enhanced by moisture regulation. This information provides a useful reference for practical KW composting treatment in the semi-continuous mode.
本研究评估了厨余垃圾（KW）嗜热半连续堆肥的可行性、系统稳定性和微生物群落演替。结果表明，在10%的进料比下处理性能稳定，有机质（OM）降解效率为81.5%，种子发芽指数（GI）为50.0%。此外，通过保持最佳堆肥含水量（50 - 60%），OM降解效率和GI分别提高到83.4%和70.0%。然而，进料比≥20%会因OM过载导致堆肥系统恶化。微生物群落分析表明，厚壁菌门、放线菌门、绿弯菌门、变形菌门和芽单胞菌门占主导地位。此外，水分调节使变形菌门丰度显著增加57.1%，放线菌门丰度降低57.8%。而且，网络分析表明，水分调节增强了细菌群落稳定性以及属间的正相互作用。该信息为半连续模式下实际的KW堆肥处理提供了有用的参考。
