物料对堆肥DOM的Fe<sup>3+</sup>生物还原强化效应的影响

练尚旺; 莫锦韬; 李诗瑶; 孙晓杰; 张军

Effects of materials on the Fe³⁺ bio-reduction enhancement of DOM in compost

Received:December 22, 2024

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KeyWord:materiel;aerobic composting;dissolved organic matter;electron transfer capacity;Fe³⁺ bio-reduction

Author Name	Affiliation	E-mail
LIAN Shangwang	Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006 China University Engineering Research Center of Watershed Protection and Green Development, Guilin 541006, China Modern Industry College of Ecology and Environmental Protection, Guilin University of Technology, Guilin 541006, China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
MO Jintao	Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006 China University Engineering Research Center of Watershed Protection and Green Development, Guilin 541006, China Modern Industry College of Ecology and Environmental Protection, Guilin University of Technology, Guilin 541006, China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
LI Shiyao	Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006 China University Engineering Research Center of Watershed Protection and Green Development, Guilin 541006, China Modern Industry College of Ecology and Environmental Protection, Guilin University of Technology, Guilin 541006, China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
SUN Xiaojie	Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006 China University Engineering Research Center of Watershed Protection and Green Development, Guilin 541006, China Modern Industry College of Ecology and Environmental Protection, Guilin University of Technology, Guilin 541006, China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
ZHANG Jun	Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006 China University Engineering Research Center of Watershed Protection and Green Development, Guilin 541006, China Modern Industry College of Ecology and Environmental Protection, Guilin University of Technology, Guilin 541006, China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China	zjun@glut.edu.cn

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Abstract:

In this study, the aim is to explore how initial raw materials affect the promotion effect of compost DOM for Fe³⁺ bio-reduction. DOM samples were obtained by extracting six types of manured compost（pig manure, PM, chicken manure, CM, silkworm excrement, SE, cassava residue, CR, kitchen waste, KW, and sewage sludge, SS）and peat soil（PS）, and then these samples were analyzed on spectrum characteristics（FTIR, UV-vis, EEM）, electron transfer capability（ETC）, and their effects after adding Fe³⁺ bio-reduction reaction with Shewanella MR-1. The results showed that：the DOM from manure composts（pig manure, chicken manure, and silkworm excrement）and sludge compost contained more aromatic structures, quinone groups, and less lignin-like content, The compost-derived DOM from cassava residue contains more microbial humic-like components, while those from chicken manure and sewage sludge each contain abundant tryptophan-like components. The ETC of compost-derived DOM from six materials was generally slightly lower than that of PS（EAC+EDC, 628.42-720.57 μmol·g^-1 vs. 710.37 μmol·g^-1）, with the order of SE>PM>CR>KW>CM>SS. The compost-derived DOM from SS, CM, and SE significantly enhanced the Fe³⁺ reduction rate within 0-2 days, showing 31.57, 25.39, and 22.60-fold increases compared to the blank control group, respectively. Correlation analysis indicated that the structural characteristics（SUVA₂₅₄ × C4, SUVA₄₃₆ × C4）of compostderived DOM had a significant positive relationship with their enhancement of Fe³⁺ bio-reduction, while the content of lignin-like substances had a significant negative correlation with it. The mature composts of SS, CM, and SE materials contain a greater amount of quinone-like tryptophan-like components, which endow them with higher electron transfer capability in Fe³⁺/Fe²⁺ and Shewanella MR-1, thereby enhancing the Fe³⁺ bio-reduction effect.