College of Life Science, Northeast Agricultural University, Harbin 150030, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Bioresour Technol. 2020 Mar;299:122575. doi: 10.1016/j.biortech.2019.122575. Epub 2019 Dec 9.
Transformation of DOM fractions with different molecular weights during composting of chicken manure (CM), garden waste (GW) and municipal solid waste (MSW) was evaluated in this study. The results revealed that DOM concentrations decreased by 49.8%, 53.9% and 86.4% during CM, GW and MSW composting, respectively. Meanwhile, low molecular weight (<650 Da) DOM was visibly transformed into high molecular weight (>10 kDa) DOM for enhancing their stability during composting. Core microorganisms promoting DOM stabilization were identified by network analysis, such as Prosthecobacter, Paenalcaligenes and Solibacillus. In addition, DOM composition was also related to the relative abundance of microbial metabolic function, such as chemoheterotrophy and aerobic chemoheterotrophy. Moreover, temperature, moisture and pH were identified as the key physicochemical factors affecting the DOM stabilization mediated by core microorganisms during composting. These above findings are helpful to regulate the DOM stabilization during composting and improve the quality of final composts.
本研究评估了鸡粪（CM）、园林废物（GW）和城市固体废物（MSW）堆肥过程中不同分子量的 DOM 分数的转化。结果表明，CM、GW 和 MSW 堆肥过程中 DOM 浓度分别降低了 49.8%、53.9%和 86.4%。同时，低分子量（<650 Da）DOM 明显转化为高分子量（>10 kDa）DOM，以提高其在堆肥过程中的稳定性。通过网络分析鉴定出促进 DOM 稳定的核心微生物，如 Prosthecobacter、Paenalcaligenes 和 Solibacillus。此外，DOM 组成还与微生物代谢功能的相对丰度有关，如化能异养和需氧化能异养。此外，温度、水分和 pH 被确定为影响堆肥过程中核心微生物介导的 DOM 稳定的关键物理化学因素。这些发现有助于调节堆肥过程中 DOM 的稳定性，提高最终堆肥的质量。
