Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, 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.
Sci Total Environ. 2022 Nov 1;845:157174. doi: 10.1016/j.scitotenv.2022.157174. Epub 2022 Jul 7.
Electrolytic oxygen aerobic composting (EOAC) effectively treats organic solid waste by using in-situ electrolytic oxygen for aeration. However, the fundamental mechanism of compost maturity is still unclear. Therefore, we comprehensively characterized dissolved organic matter (DOM) transformation closely related to compost maturity during EOAC. Excitation-emission matrix-parallel factor (EEM-PARAFAC) and Fourier transform infrared (FTIR) analysis confirmed that EOAC quickly decreased organic matter and increased humus substances, accelerating the compost humification process compared with conventional aerobic composting. Electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis reveals that the double bound equivalent and aromaticity index during EOAC are higher than in conventional aerobic composting (CAC), suggesting more aromatic compounds in EOAC. DOM's detailed transformation investigation suggested that low O/C and high H/C compounds were preferentially decomposed during EOAC. Our investigation firstly extends the in-depth molecular mechanisms of humification during EOAC, and reveals its practical engineering applications.
电氧好氧堆肥（EOAC）通过原位电氧曝气有效地处理有机固体废物。然而，堆肥成熟的基本机制仍不清楚。因此，我们全面表征了与 EOAC 中堆肥成熟度密切相关的溶解有机物（DOM）转化。激发发射矩阵-平行因子（EEM-PARAFAC）和傅里叶变换红外（FTIR）分析证实，与传统好氧堆肥相比，EOAC 可快速降解有机物并增加腐殖质物质，从而加速堆肥腐殖化过程。电喷雾电离（ESI）傅里叶变换离子回旋共振质谱（FT-ICR MS）分析表明，EOAC 过程中的双键当量和芳香指数高于传统好氧堆肥（CAC），表明 EOAC 中存在更多的芳香化合物。DOM 的详细转化研究表明，在 EOAC 过程中，低 O/C 和高 H/C 化合物优先分解。我们的研究首次扩展了 EOAC 过程中腐殖化的深入分子机制，并揭示了其实际工程应用。
