title: Spectroscopic characterization of dissolved organic matter in coking wastewater during bio-treatment: full-scale plant study.
abstract: This paper taking a full-scale coking wastewater (CWW) treatment plant as a case study aimed to characterize removal behaviors of dissolved organic matter (DOM) by UV spectra and fluorescence excitation-emission matrix-parallel factor analysis (PARAFAC), and investigate the correlations between spectroscopic indices and water quality parameters. Efficient removal rates of chemical oxygen demand (COD), dissolved organic carbon (DOC) and total nitrogen (TN) after the bio-treatment were 91.3%, 87.3% and 69.1%, respectively. UV270 was proven to be a stable UV absorption peak of CWW that could reflect the mixture of phenols, heterocyclics, polynuclear aromatic hydrocarbons and their derivatives. Molecular weight and aromaticity were increased, and also the content of polar functional groups was greatly reduced after bio-treatment. Three fluorescent components were identified by PARAFAC: C1 (tyrosine-like), C2 (tryptophan-like) and C3 (humic-like). The removal rate of protein-like was higher than that of humic-like and C1 was identified as biodegradable substance. Correlation analysis showed UV270 had an excellent correlation with COD (r=0.921, n=60, P<0.01) and DOC (r=0.959, n=60, P<0.01) and significant correlation (r=0.875, n=60, P<0.01) was also found between C2 and TN. Therefore, spectroscopic characterization could provide novel insights into removal behaviors of DOM and potential to monitor water quality real-time during CWW bio-treatment.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: cechwei@scut.edu.cn; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Xu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: cechwei@scut.edu.cn; Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutions, School of Environment, Jinan University, Guangzhou, 510632, China.
authors.forename: Huase
authors.initials: H
authors.lastname: Ou
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: cechwei@scut.edu.cn; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Xubiao
authors.initials: X
authors.lastname: Yu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: cechwei@scut.edu.cn; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Runsheng
authors.initials: R
authors.lastname: He
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: cechwei@scut.edu.cn; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Chong
authors.initials: C
authors.lastname: Lin
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: cechwei@scut.edu.cn; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
authors.forename: Chaohai
authors.initials: C
authors.lastname: Wei
mesh_terms: D057919:Biological Oxygen Demand Analysis; D003077:Coke; D005163:Factor Analysis, Statistical; D007220:Industrial Waste; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis*; D010636:Phenols / Q000032:analysis; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis; D018505:Waste Management; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality
chemical_list: D003077:Coke; D007220:Industrial Waste; D009584:Nitrogen; D009930:Organic Chemicals; D010636:Phenols; D062065:Wastewater; D014874:Water Pollutants, Chemical