Response of maturity, humification, and gaseous emissions to initial moisture content in collaborative composting of multiple organic solid wastes

文献类型： 外文期刊

第一作者： Li, Xuyan

作者： Li, Xuyan;Tang, Ruolan;Liu, Yan;Wang, Jiani;Li, Guoxue;Yuan, Jing;Ma, Ruonan;Lin, Jiacong;Lin, Jiacong

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关键词： Moisture content; Maturity; Humification; Gaseous emission; Collaborative composting

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 5 期

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收录情况： SCI

摘要： Balancing high compost maturity and humification with minimized gas emissions remains a key challenge in composting. This study investigated the impact of initial moisture content (MC) on these parameters during cocomposting of pig manure, kitchen waste, and cornstalks. Three treatments with MC levels of 50 % (MC50), 62.5 % (MC62.5), and 75 % (MC75) were evaluated. Results demonstrated that MC62.5 significantly enhanced compost maturity and humification, exhibiting strong positive correlations with germination index (GI, R = 0.95), cumulative accumulated temperature (CAT, R = 0.96), and oxygen levels (R = 0.53). MC62.5 achieved the highest maturity (germination index: 110.54 %), 25.51 % and 2.21 % greater than MC50 and MC75, respectively, due to improved microbial activity via temperature-oxygen synergy. It also exhibited optimal humification (PV/PIII ratio: 9.73), 17.87 % and 23.16 % higher than MC50 and MC75. MC75 significantly reduced NH3 (49.94-71.00 %) and NAO (70.51-81.59 %) emissions compared to MC50 and MC62.5, as higher moisture promoted nitrogen incorporation into humic substances. Conversely, MC50 reduced the emissions of CH4 (32.33-49.07 %) and HAS (58.35-77.31 %) by maintaining a porous, aerobic structure that inhibited methanogens and sulfate-reducing bacteria. For optimal compost maturity and humification, MC62.5 is recommended. To reduce CH4 and H2S emissions, MC50 is advised, while 75 % is preferable for minimizing NH3 and N2O emissions. In summary, maintaining an initial moisture content of 62.5 % is advisable for co-composting, as this moisture level enhances both maturity and humification in the final compost product. This study provides theoretical groundwork for optimizing multi-substrate composting.

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