文献类型：期刊文献

英文题名：Mechanism of toxicity formation and spatial distribution in activated sludge treating synthetic effluent containing bisphenol A (BPA)

作者：Zhao, Jianguo[1];Chen, Xiurong[1];Lin, Fengkai[1];Yang, Na[1];Huang, Hua[1];Zhao, Jun[1]

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

年份：2014

卷号：250

起止页码：91

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20141917695705);WOS:【SCI-EXPANDED(收录号:WOS:000337863700012)】；

基金：This study was financially supported by the Natural Science Foundation of China (Nos. 51008124 and 51378207), the Natural 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：Bisphenol A (BPA) synthetic effluent; Sludge toxicity; Spatial distribution; Adsorption; Biodegradation; Bacterial community

摘要：Organic sludge toxicity is a critical issue for sludge land applications. To investigate sludge organic toxicity formation and spatial distribution properties, sludge was acclimated using synthetic effluent containing various bisphenol A (BPA) concentrations in sequential aerobic activated sludge reactors (SBRs). Acute sludge toxicity, which was characterized by the inhibition rate of the luminescent bacterium Photobacterium phosphoreum, was the focus of this study. The original influent COD of the SBR was approximately 300 mg/L; the sludge retention time (SRT) and hydraulic retention time (HRT) were controlled at 20 d and 12 h, respectively. The results indicated that a positive correlation existed between sludge toxicity and the influent BPA concentration. Furthermore, the toxicity was centralized in the intracellular and inner sections of extracellular polymeric substance (EPS) in sludge flocs. BPA concentrations were controlled at 2.5 mg/L, 5.0 mg/L, 7.5 mg/L and 20 mg/L; the sludge toxicities, measured by comparing the control SBR with the blank, were 2.99%, 4.05%, 6.99% and 10.64%, respectively, at the end of 28-day operation. In the 12-h SBR treatment process, aqueous and sludge phase BPA was completely removed within 2 h. However, the maximum sludge toxicity appeared in the 8th hour. The DGGE analysis suggested that the existence of BPA in wastewater increased bacterial diversity in activated sludge. However, the bacterial similarity between sludge in SBRs decreased with increasing BPA concentration. Lastly, the bacterial similarity between blank sludge and control sludge of 20 mg/L BPA was 0.47. (C) 2014 Elsevier B.V. All rights reserved.