title: The influence of SBR parameters on the sludge toxicity of synthetic wastewater containing bisphenol A.
abstract: Synthetic wastewater with bisphenol A (BPA) concentrations of 7.5, 20, and 40 mg/L was treated with activated sludge sequential batch reactors (SBRs). The sludge acute toxicity indicated by the inhibitory ratio to luminous bacteria T3 was evaluated. The influent COD was controlled at approximately 300 mg/L, and aerobic conditions were maintained in the SBR. It was found that the process of BPA biodegradation, as opposed to BPA adsorption, contributed to the formation of sludge toxicity; there was a positive relationship between sludge toxicity and influent BPA concentration, and the toxicity centralized in intracellular regions and the intersection of extracellular polymeric substances (EPS) in sludge flocs. Since the BPA biodegradation process dedicated to sludge toxicity, the influence of key operational parameters such as sludge retention time (SRT) and hydraulic retention time (HRT) on sludge toxicity were investigated. It was founded that sludge toxicity decreased significantly when SRT and HRT were shortened from 20 to 10 days and 12 to 8 h, respectively. The results of Pearson correlation analysis indicated that the Shannon index H of the bacterial community correlated significantly to sludge toxicity. The results from both similarity analysis and UPGMA indicated that influent quality characteristic contributes much more to bacterial community than operation parameters, and then leads to difference between blank and control sludge toxicity.
authors.affiliation: School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China, xrchen@ecust.edu.cn.
authors.forename: Xiurong
authors.initials: X
authors.lastname: Chen
authors.forename: Jianguo
authors.initials: J
authors.lastname: Zhao
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Na
authors.initials: N
authors.lastname: Yang
authors.forename: Fei
authors.initials: F
authors.lastname: Zhang
authors.forename: Zijian
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D000327:Adsorption; D000332:Aerobiosis; D001559:Benzhydryl Compounds / Q000633:toxicity*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D010636:Phenols / Q000633:toxicity*; D012722:Sewage / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D010636:Phenols; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds
references.citation: Water Res. 2010 Oct;44(18):5499-509
references.pmid: 20655085
references.citation: Reprod Toxicol. 2007 Aug-Sep;24(2):225-39
references.pmid: 17604601
references.citation: Chemosphere. 2007 Jan;66(2):353-61
references.pmid: 16774780
references.citation: Water Res. 2004 Apr;38(8):2103-10
references.pmid: 15087191
references.citation: J Environ Manage. 2012 Mar;95 Suppl:S193-8
references.pmid: 21193264
references.citation: Biomed Environ Sci. 2008 Aug;21(4):345-52
references.pmid: 18837300
references.citation: J Hazard Mater. 2011 Dec 15;197:404-16
references.pmid: 22023905
references.citation: Aquat Toxicol. 2003 Jan 24;62(2):119-34
references.pmid: 12505380
references.citation: Environ Pollut. 2003;126(1):39-49
references.pmid: 12860101
references.citation: Environ Int. 2007 May;33(4):505-13
references.pmid: 17188749
references.citation: Chemosphere. 2010 Feb;78(8):923-41
references.pmid: 20083294
references.citation: Sci Total Environ. 2012 Dec 15;441:125-31
references.pmid: 23137977
references.citation: Bull Environ Contam Toxicol. 2012 Jul;89(1):27-31
references.pmid: 22562268
references.citation: Waste Manag. 2008;28(2):347-58
references.pmid: 17320368
references.citation: Chemosphere. 2008 Jul;72(8):1215-28
references.pmid: 18452969
references.citation: Water Res. 2012 Oct 15;46(16):4973-80
references.pmid: 22796004
references.citation: Ecotoxicol Environ Saf. 2005 Nov;62(3):397-407
references.pmid: 16216634
references.citation: Chemosphere. 2005 Dec;61(9):1358-69
references.pmid: 16291406
references.citation: Environ Pollut. 2012 Jan;160(1):88-94
references.pmid: 22035930
references.citation: Biotechniques. 1997 Feb;22(2):326-30
references.pmid: 9043706
references.citation: Sci Total Environ. 2010 Jan 1;408(3):563-70
references.pmid: 19896162
references.citation: J Biol Chem. 1994 Mar 11;269(10):7323-9
references.pmid: 8125948
references.citation: Chemosphere. 2008 Oct;73(6):980-9
references.pmid: 18682307
references.citation: Biol Pharm Bull. 2005 Feb;28(2):201-7
references.pmid: 15684469
references.citation: Chemosphere. 2011 Oct;85(3):418-23
references.pmid: 21885085
references.citation: Sci Total Environ. 2006 Aug 31;367(2-3):481-97
references.pmid: 16750559
references.citation: J Environ Manage. 2012 Mar;95 Suppl:S149-53
references.pmid: 21652141
references.citation: Water Res. 2001 Apr;35(6):1415-24
references.pmid: 11317888
references.citation: Chemosphere. 2007 Aug;68(9):1751-62
references.pmid: 17509650
references.citation: Bioresour Technol. 2011 Aug;102(16):7415-21
references.pmid: 21652206
references.citation: Ecotoxicol Environ Saf. 2004 Mar;57(3):426-30
references.pmid: 15041265
references.citation: Water Res. 2001 Jan;35(1):91-100
references.pmid: 11257897
references.citation: Chemosphere. 2008 May;71(11):2129-38
references.pmid: 18329688
references.citation: Chemosphere. 2006 Nov;65(7):1153-62
references.pmid: 16725180
references.citation: Mol Hum Reprod. 2005 Jun;11(6):389-96
references.pmid: 15879462
references.citation: Environ Int. 2012 Jul;42:1-9
references.pmid: 21450345
references.citation: Environ Int. 2011 Jan;37(1):226-47
references.pmid: 20797791