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8262605 
Journal Article 
Analysis of difficulties in meeting discharge standard and DOM specific during treating centralized wastewater in the printing and dyeing industrial park 
Zhou, Y; Li, H; Zheng, K; Lyu, J; Li, J 
2020 
Huanjing Gongcheng Xuebao / Chinese Journal of Environmental Engineering
ISSN: 1673-9108 
14 
8 
2193-2202 
Chinese 
In this study, the change properties of organic matter, nitrogen and phosphorous were analyzed in centralized wastewater treatment plant in the dyeing industrial park of Taihu Lake basin. The average concentrations of TP, TN, NH3-N and COD in the effluent were 0.20, 5.39, 0.60 and 55 mg•L-1, respectively. However, only COD failed to reach the requirement in the new standard DB 32-2018. In order to solve the issues in COD meeting standards, 3D EEM, FT-IR and GC-MS tests were carried out to elucidate the removal, migration and transformation rules of dissolved organic matter in dyeing wastewater along the treatment process. The results showed that the fluorescence intensity of wastewater was significantly reduced after biochemical treatment. Tryptophans were significantly removed by advanced treatment, and the fluorescence characteristic peaks in effluent were markedly weakened with the removal of most proteins and humic acids. Further analysis showed that unsaturated double bonds compounds and aromatic compounds existed in the effluent of each treatment unit, and the dominant typical functional groups contained -OH, unsaturated aromatic ring C=C and C≡N. The main components in final effluent were 2,4'-difluorobenzophenone and 4-hydroxy-4-methyl-2-pentanone, which were identified as characteristic organic pollutants in the printing and dyeing wastewater. In this study, the difficulties and characteristics of dissolved organic matter during the centralized wastewater treatment in printing and dyeing park were clarified, and could provide data and technical support for similar wastewater treatment. © 2020, Science Press. All right reserved. 
Discharge standard; Dissolved organic matter; Excitation emission matrix spectra; Fourier transform infrared spectroscopy; Printing and dyeing wastewater