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Characterization of the dissolved organic matter in sewage effluent of sequence batch reactor: the impact of carbon source |
Jin GUO1( ), Feng SHENG1, Jianhua GUO2, Xiong YANG1, Mintao MA1, Yongzhen PENG1() |
| 1. School of Environment and Energy Engineering, Beijing University of Technology, Beijing 100124, China; 2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China |
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Abstract Dissolved organic matter (DOM) transformation in sequence batch reactor (SBR) fed with carbon sources of different biodegradability was investigated. During the biologic degradation process, the low molecular weight (MW) fraction (<1 kDa) gradually decreased, while the refractory compounds with higher aromaticity were aggregated. Size exclusion chromatography (SEC) and fluorescence of excitation emission matrices (EEM) demonstrated that more biopolymers (polysaccharides or proteins) and humic-like substances were presented in the extracellular polymeric substance (EPS) extracted from the SBR fed with sodium acetate or glucose, while the EPS from SBR fed with slowly biodegradable dissolved organic carbon (DOC) substrate-starch had relatively less biopolymers. Comparing the EfOM in sewage effluent of three SBRs, the effluent from SBR fed with starch is more aromatic. Organic carbon with MW>1 kDa as well as the hydrophobic fraction in DOM gradually increased with the carbon sources changing from sodium acetate to glucose and starch. The DOC fractionation and the EEM all demonstrated that EfOM from the effluent of the SBR fed with starch contained more fulvic acid-like substances comparing with the SBR fed with sodium acetate and glucose.
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| Keywords
effluent organic matter (EfOM)
extracellular polymeric substance (EPS)
molecular weight distribution (MWD)
hydrophobic
hydrophilic
excitation emission matrices (EEM)
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Corresponding Author(s):
GUO Jin,Email:guojin1979@gmail.com; PENG Yongzhen,Email:pyz@bjut.edu.cn
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Issue Date: 01 April 2012
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