ELECTRON TRANSFER MECHANISM AND SPECTRAL EVOLUTION CHARACTERISTICS OF HUMIC ACID DURING PIG MANURE COMPOSTING

LI Kemeng; LI Jieyue; YOU Shaohong; SUN Xiaojie; LI Ningjie; HUANG Hongwei; XIAO He

doi:10.13205/j.hjgc.202212011

Volume 40 Issue 12

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(12): 79-88

LI Kemeng, LI Jieyue, YOU Shaohong, SUN Xiaojie, LI Ningjie, HUANG Hongwei, XIAO He. ELECTRON TRANSFER MECHANISM AND SPECTRAL EVOLUTION CHARACTERISTICS OF HUMIC ACID DURING PIG MANURE COMPOSTING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 79-88. doi: 10.13205/j.hjgc.202212011

Citation:

LI Kemeng, LI Jieyue, YOU Shaohong, SUN Xiaojie, LI Ningjie, HUANG Hongwei, XIAO He. ELECTRON TRANSFER MECHANISM AND SPECTRAL EVOLUTION CHARACTERISTICS OF HUMIC ACID DURING PIG MANURE COMPOSTING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 79-88. doi: 10.13205/j.hjgc.202212011

Citation:

LI Kemeng, LI Jieyue, YOU Shaohong, SUN Xiaojie, LI Ningjie, HUANG Hongwei, XIAO He. ELECTRON TRANSFER MECHANISM AND SPECTRAL EVOLUTION CHARACTERISTICS OF HUMIC ACID DURING PIG MANURE COMPOSTING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 79-88. doi: 10.13205/j.hjgc.202212011

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ELECTRON TRANSFER MECHANISM AND SPECTRAL EVOLUTION CHARACTERISTICS OF HUMIC ACID DURING PIG MANURE COMPOSTING

doi: 10.13205/j.hjgc.202212011

1. College of Environment Science and Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China

Received Date: 2022-08-21
Available Online: 2023-03-23

Abstract

Abstract

Humic acid (HA) and Fulvic acid (FA) are organic components produced during the composting process, which have redox ability to act as electron shuttles to mediate the bioreduction of pollutants, due to the presence of active functional groups such as quinone and phenol groups. In this study, the electron transfer capacity (ETC) of HA and FA in different periods of pig manure composting was determined by electrochemical method, and the chemical structure changes of HA and FA and their effects on ETC were investigated by combining UV-Vis, FTIR and 3D-EEM. The results showed that from beginning to the end, the ETC of HA increased from 10.06 μmol e^-/g C to 40.07 μmol e^-/g C, and the ETC of FA increased from 15.36 μmol e^-/g C to 69.73 μmol e^-/g C, both of which showed a fluctuating increasing trend with time, and EDC was dominant in the electron transfer process. Spectral analysis showed that lignin-like substances in the compost would be transformed into humus with a high degree of polymerization after composting. Compared with the initial stage of composting, the degree of humification and aromatization of organic matter at the maturity stage increased, and the molecular weight also raised. Protein-like substances (component C4) gradually decreased in the composting process, which was easy to be used as carbon sources by microorganisms to convert into humic-like substances (component C2), and component C2 was relatively stable in composting. Correlation analysis showed that a decrease in protein-like substances and an increase in humification enhanced the ETC of HA and FA, and the electron transfer capacity of FA was more susceptible to the degree of humification.
- pig manure composting,
- humic acids,
- electron transfer mechanism,
- spectral evolution characteristics

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References(54)

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