Citation: YANG Chao, HE Xiao-Song, GAO Ru-Tai, XI Bei-Dou, HUANG Cai-Hong, ZHANG Hui, TAN Wen-Bing, LI Dan. Effect of Compositional and Structural Evolution of Size-fractionated Dissolved Organic Matter on Electron Transfer Capacity during Composting[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(4): 579-586. doi: 10.11895/j.issn.0253-3820.160752 shu

Effect of Compositional and Structural Evolution of Size-fractionated Dissolved Organic Matter on Electron Transfer Capacity during Composting

YANG Chao ^1,2,3, ,
HE Xiao-Song ^2,3 ,
GAO Ru-Tai ^2,3 ,
XI Bei-Dou ^1,2,3 ,
HUANG Cai-Hong ^2,3 ,
ZHANG Hui ^2,3 ,
TAN Wen-Bing ^2,3 ,
LI Dan ^2,3

1.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3.
State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Science, Beijing 100012, China

Received Date: 11 October 2016
Revised Date: 6 December 2016

Fund Project: This work was supported by the China National Funds for Distinguished Young Scientists (No.51325804) and the National Natural Science Foundation of China (No.51508540)

Ultrafiltration technology and spectrum technology were used to study the compositional and structural evolution of size-fractionated dissolved organic matter (DOM) during chicken manure composting. Electrochemical method was used to measure electron transfer capacity. The results showed that most of protein-like components were exist in DOM (MW< 1 kDa) and it was the main components in DOM (MW< 1 kDa) during initial composting. The protein-like components were persistently degraded and the humic-like components were persistently generated during composting process. The protein-like components didn't exist in DOM (MW< 1 kDa) and the fulvic-like components were the main components in the end of composting process. The humic-like substances were the main fluoresence components of DOM (MW=1-3 kDa, MW=3-5 kDa, MW>5 kDa). Though the changes of humic-like components with different molecular weight of DOM were different during composting, the content of humic-like components in the end of composting process was higher than that in the initial composting process. The electron donating capacity was persistently reducing and electron accepting capacity was persistently increasing for DOM with MW< 1 kDa in the process of composting. In contrast, for the DOM with MW>1 kDa, the electron donating capacity was persistently increasing and the electron accepting capacity was irregular in the process of composting process. Meanwhile, the change of electron transfer capacity was irregular for DOM with MW = 1-3 kDa and MW=3-5 kDa. In a word, EAC of compost-derived DOM with size-fractionation was controlled by the aromatic carbon content which was derived from lignin degradation, but not related to spectrum parameter.
- Composting,
- Dissolved organic matter,
- Molecular weight,
- Electron transfer capacity,
- Parallel factor analysis
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