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| Characterization of dissolved organic matter changes during electrolysis of biochemical effluent in printing and dyeing |
| ZHENG Rui-hao1,2, HUANG Yan3, LIU Zi-feng1,2, WANG Jia-de1,2 |
1. College of Environment, Zhejiang University of Technoloy, Hangzhou 310014, China;
2. Zhejiang Provincial Key Laboratory of Industrial Pollution Microbial Control Technology, Hangzhou 310014, China;
3. Deqing Ecological Environment Monitoring Station, Deqing 313200, China |
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Abstract Fluorescence excitation emission matrix (EEM), combined with ultraviolet-visible absorption spectroscopy (UV-vis), infrared spectroscopy (IR) and gas chromatography-mass spectrometry (GC-MS), were employed to identify the structure and composition of dissolved organic matter (DOM) from the electrolysis process of printing and dyeing biochemical effluent, to reveal the changes in macroscopic water quality indicators COD and BOD. The three-dimensional fluorescence spectroscopy PARAFAC analysis showed that there were three significant fluorescence peaks of tyrosine (C1), tryptophan (C2) and humic acid (YC3) in printing and dyeing biochemical effluent. At a current density of 15mA/cm2, after a certain period of electrolysis (e.g. 30min), the original fluorescence intensity began to gradually weaken, the maximum fluorescence intensity (Fmax) of C1 and C2 fractions remained the same, and DC3 tryptophan component appeared and reduced Fmax. The B/C ratio of the wastewater increased from 0.27 to 0.42, and the C=C, C=O, C-N and C-O-C structures of the printing and dyeing biochemical tailwater DOM were degraded and the corresponding organic compounds such as olefins, ketones, amines, alcohols, benzenes, halogenated hydrocarbons and esters in the raw water were gradually degraded into small molecule organic acids, alkyl esters, alkanes and other by-products, which is the essential reason for the transformation of fluorophores and the improvement of biochemical properties. The three-dimensional fluorescence visualizes the characteristic spectra of the DOM composition of the electrolysis process, which supports the scientific evaluation of the electrolysis technology and the subsequent traceability of the printing and dyeing biochemical effluent.
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Received: 05 May 2022
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