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Reduced pH is the primary factor promoting humic acid formation during hyperthermophilic pretreatment composting

文献类型： 外文期刊

作者： Cao, Yun 1 ; Gu, Junyu 1 ; Zhang, Jing 1 ; Chen, Bao 1 ; Xu, Yueding 1 ; Liu, Dongyang 2 ; Hu, Hangwei 5 ; Huang, Hongying 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

2.Jiangsu Collaborat Innovat Ctr Solid Organ Waste, Nanjing 210095, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Crop & Livestock Integrated Farming, Nanjing 210014, Peoples R China

4.Nanjing Agr Univ, Coll Resources & Environm, Nanjing 210095, Peoples R China

5.Univ Melbourne, Fac Vet & Agr Sci, Melbourne, Vic 3010, Australia

关键词： Hyperthermophilic pretreatment composting; Bacterial community; Fluorescence excitation emission matrix (EEM); Humification; Co-60 radiation

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.91； 五年影响因子：8.549 ）

ISSN： 0301-4797

年卷期： 2022 年 316 卷

页码：

收录情况： SCI

摘要： Hyperthermophilic pretreatment composting (HPC) has the advantages of enhanced composting efficiency and accelerated humic substance (HS) over conventional composting (CC). However, the mechanisms towards the accelerated humification process by HPC are still not clear. By means of sterilization technology, the roles of abiotic and biotic components on the formation of HS can be distinguished. The study investigated the humification degree and the succession of microbial community during HPC of pig manure. The mechanisms underlying the accelerated humification by HPC was identified using gamma sterilization. Results showed that HS content increased significantly by 13.72% in HPC and 29.93% in sterilized HPC inoculated with 1% CC (HPC_I), compared with 8.76% increase in CC and 7.12% increase in sterilized CC inoculated with 1% HPC during composting (CC_I). Compared with CC and CC_I, stronger intensities of HA-like and fulvic acid-like components were observed in HPC and HPC_I. Results showed that physicochemical properties, especially pH, were the key factors in accelerating the humification in HPC, while both physicochemical properties and microbial community contributed to the HA formation in CC. The study contributed to a better understanding of the mechanism towards the accelerated humification degree in HPC.

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