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Effect of MnO2 on biotic and abiotic pathways of humic-like substance formation during composting of different raw materials

文献类型： 外文期刊

作者： Qi, Haishi 1 ; Wei, Zimin 1 ; Zhang, Jinming 1 ; Zhao, Yue 1 ; Wu, Junqiu 1 ; Gao, Xintong 1 ; Liu, Zhenyong 2 ; Li, Yanj 1 ;

作者机构： 1.Northeast Agr Univ, Coll Life Sci, Harbin 150030, Heilongjiang, Peoples R China

2.Agr Technol Master Stn Promot, Heihe 164300, Heilongjiang, Peoples R China

3.Heilongjiang Acad Agr Sci, Heihe Branch, Heihe 164300, Heilongjiang, Peoples R China

关键词： Composting; Humic-like substance; MnO2; Hetero-two-dimensional correlation spectra; Components transformation; Organic waste

期刊名称：WASTE MANAGEMENT （ 影响因子：7.145； 五年影响因子：7.907 ）

ISSN： 0956-053X

年卷期： 2019 年 87 卷

页码：

收录情况： SCI

摘要： The humic-like substances (HLS) are proposed to be formed by biotic and abiotic pathways. The abiotic pathways were neglected in existed composting studies. The present study aims to accelerate the abiotic pathways, and to investigate how MnO2 drives the HLS transformation via changing the contribution of abiotic and biotic pathways during composting with different materials. Parallel factor analysis model (PARAFAC), hetero two-dimensional correlation spectra (hetero-2DCOS) and variance partitioning were used to identify the effects of MnO2 on the formation of humic acid (HA) and fluvic acid (FA) during composting of chicken manure (CM) and corn straw (CS). The addition of MnO2 could change the structures of HLS during CS and CM composting, mainly promoting the formation of complex components in HA and FA during CS composting, as well as the complex components of FA during CM composting. Meanwhile, the addition of MnO2 could reshape the microbial ecology, which enhanced the correlation between microbes and complex components formation during composting, especially in CM composting. Variance partitioning showed that both abiotic and biotic pathways were stimulated in conversion of HLS components after adding MnO2 during CS composting, especially for the abiotic pathways. During CM composting, the MnO2 promoted biotic effects on the conversion of HLS components. Above all, the addition of MnO2 could stimulate pathways of biotic, abiotic or both of them to improve the humification degree of HLS by changing microbial ecology, which could be a promising way for promoting the application value of composting products. (C) 2019 Elsevier Ltd. All rights reserved.

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