文献类型：期刊文献

英文题名：Toxicity formation and distribution in activated sludge during treatment of N,N-dimethylformamide (DMF) wastewater

作者：Yang, Na[1];Chen, Xiurong[1];Lin, Fengkai[1];Ding, Yi[1];Zhao, Jianguo[1];Chen, Shanjia[1]

机构：[1]E China Univ Sci & Technol, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：264

起止页码：278

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20135017080858);WOS:【SCI-EXPANDED(收录号:WOS:000331021200034)】；

基金：This research was supported by the National Natural Science Foundation (No. 51008124), the National Science Foundation for Distinguished Young Scholars of China (No. 51125032) and Shanghai Pujiang Program (No. 13PJD009) in China.

语种：英文

外文关键词：Activated sludge toxicity; N,N-dimethylformamide (DMF); Adsorption and biodegradation; Bacterial community

摘要：The organic toxicity of sludge in land applications is a critical issue; however, minimal attention has been given to the mechanism of toxicity formation during high-strength wastewater treatment. To investigate the relevant factors that contribute to sludge toxicity, synthetic wastewater with N,N-dimethylformamide (DMF) was treated in a sequential aerobic activated sludge reactor. The acute toxicity of sludge, which is characterised by the inhibition rate of luminous bacteria T3, is the focus of this study. Using an operational time of 28 days and a hydraulic retention time of 12 h, the study demonstrated a positive relationship between the acute toxicity of sludge and the influent DMF concentration; the toxicity centralised in the intracellular and inner sections of extracellular polymeric substances (EPS) in sludge flocs. Due to increased concentrations of DMF, which ranged from 40 to 200 mg L-1, the sludge toxicity increased from 25 to 45%. The organic toxicity in sludge flocs was primarily contributed by the biodegradation of DMF rather than adsorption of DMF. Additional investigation revealed a significant correlation between the properties of the bacterial community and sludge toxicity. (C) 2013 Elsevier B.V. All rights reserved.