College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Key Laboratory of Water and Sediment Sciences (Ministry of Education), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Sci Total Environ. 2022 Dec 1;850:157939. doi: 10.1016/j.scitotenv.2022.157939. Epub 2022 Aug 9.
Electrolytic oxygen aerobic composting (EOAC) is an effective treatment with greater technical superiority and cost advantages for organic solid waste using in situ electrolytic oxygen as a feasible strategy to replace conventional aeration. However, the unclear effects of distribution and variation of in situ electrolytic oxygen on compost maturation in different depth zones of EOAC need further exploration. This study demonstrated that the humification of organic matter was faster at the bottom than in the middle and at the top. The main reason was that the higher oxygen content and lower moisture content in the bottom promoted microbial degradation and heat production, resulting in higher temperatures. The microbial analysis showed that the abundance of typical thermophilic bacteria (such as Cerasibacillus, Lactobacillus, and Pseudogracilibacillus) that could promote compost maturation was higher at the bottom than in the middle and at the top. The finding provided in-depth molecular insights into differentiated humification from bottom to top in EOAC and revealed its further practical engineering applications.
电氧好氧堆肥（EOAC）是一种有效的处理方法，对于利用原位电氧代替传统曝气的有机固体废物具有更大的技术优势和成本优势。然而，原位电氧在 EOAC 不同深度区域分布和变化对堆肥成熟的影响尚不清楚，需要进一步探索。本研究表明，有机物的腐殖化在底部比在中间和顶部更快。主要原因是底部较高的含氧量和较低的含水量促进了微生物的降解和产热，导致更高的温度。微生物分析表明，底部典型嗜热菌（如蜡状芽孢杆菌、乳杆菌和假糖芽孢杆菌）的丰度高于中间和顶部，这些细菌可以促进堆肥成熟。该发现为 EOAC 从底部到顶部的腐殖化差异提供了深入的分子见解，并揭示了其在进一步实际工程应用中的潜力。
