Effect of electric field on structure of fulvic acid during sludge composting
TAN Zhi-han1,2, SUN Xiao-jie1,2, Xi Bei-dou1,3, LU Xue-shuang1,2, LI Qiu-hong1,2, MO Jing-jing1,2, Zhang Jun1,2
1. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China; 2. Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base, Guilin 541004, China; 3. State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract:Fulvic acid (FA) is an important component of compost-derived humic substances, and its structure and electron transfer capacity are vital factors causing environmental effects. In order to investigate the influence of electric field on structural characteristics and electron transfer capacity (ETC) of FA that was formed during sludge composting, municipal sludge and rice bran were applied as raw materials, and two composting experiments, i.e.,one with a 5V direct current electric field and the other with no electric field (CK),were set up. Excitation-emission matrix florescence spectra coupled with parallel factor analysis, ultraviolet and visible spectroscopy, and Fourier transform infrared spectroscopy combined with two-dimensional correlation analysis were employed to investigate the evolution of the structure and composition of FA during composting. In addition, electrochemical methods was applied to determine the electron accepting capacities (EAC) and electron donating capacities (EDC) of the compost-derived FA. The results revealed that the major components of compost-derived FA were tryptophane-like, fulvic-like, and humic-like substances. Tryptophane-like substances in FA decreased during composting, whereas fulvic-like and humic-like substances increased during the process. Notably, the electric field promoted the degradation of tryptophan-like substances and the formation of humic-like substances, which inceased the aromatic degree, molecular weight, and humification of the FA. Results obtained from electrochemical analysis showed that the ETC of compost-derided FA increased initially and then decreased, Compared to the CK treatment, electric field application enhanced the EAC of compost-derided FA, though it reduced the EDC of FA, resulting the ETC of the FA from the later stage of composing was the highest. These results facilitated to elucidate the formation process of the FA and its redox properties during sludge composting.
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TAN Zhi-han, SUN Xiao-jie, Xi Bei-dou, LU Xue-shuang, LI Qiu-hong, MO Jing-jing, Zhang Jun. Effect of electric field on structure of fulvic acid during sludge composting. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 244-254.
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