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Fate of volatile aromatic hydrocarbons in the wastewater from six textile dyeing wastewater treatment plants

Ning, Xun-An, Wang, Jing-Yu, Li, Rui-Jing, Wen, Wei-Bin, Chen, Chang-Min, Wang, Yu-Jie, Yang, Zuo-Yi, Liu, Jing-Yong
Chemosphere 2015 v.136 pp. 50-55
activated sludge, benzene, biodegradation, dyeing, effluents, ethylbenzene, fabrics, sorption, styrene, toluene, volatilization, wastewater, wastewater treatment, xylene
The occurrence and removal of benzene, toluene, ethylbenzene, xylenes, styrene and isopropylbenzene (BTEXSI) from 6 textile dyeing wastewater treatment plants (TDWTPs) were investigated in this study. The practical capacities of the 6 representative plants, which used the activated sludge process, ranged from 1200 to 26000m3d−1. The results indicated that BTEXSI were ubiquitous in the raw textile dyeing wastewater, except for isopropylbenzene, and that toluene and xylenes were predominant in raw wastewaters (RWs). TDWTP-E was selected to study the residual BTEXSI at different stages. The total BTEXSI reduction on the aerobic process of TDWTP-E accounted for 82.2% of the entire process. The total BTEXSI concentrations from the final effluents (FEs) were observed to be below 1μgL−1, except for TDWTP-F (2.12μgL−1). Volatilization and biodegradation rather than sludge sorption contributed significantly to BTEXSI removal in the treatment system. BTEXSI were not found to be the main contaminants in textile dyeing wastewater.