Understanding the Role of Extracellular Polymeric Substances on Ciprofloxacin Adsorption in Aerobic Sludge, Anaerobic Sludge, and Sulfate-Reducing Bacteria Sludge Systems

Environmental Science & Technology
Huiqun ZhangQing Zhao

Abstract

Extracellular polymeric substances (EPS) of microbial sludge play a crucial role in removal of organic micropollutants during biological wastewater treatment. In this study, we examined ciprofloxacin (CIP) removal in three parallel bench-scale reactors using aerobic sludge (AS), anaerobic sludge (AnS), and sulfate-reducing bacteria (SRB) sludge. The results showed that the SRB sludge had the highest specific CIP removal rate via adsorption and biodegradation. CIP removal by EPS accounted up to 35. 6 ± 1.4%, 23.7 ± 0.6%, and 25.5 ± 0.4% of total removal in AS, AnS, and SRB sludge systems, respectively, at influent CIP concentration of 1000 μg/L, which implied that EPS played a critical role in CIP removal. The binding mechanism of EPS on CIP adsorption in three sludge systems were further investigated using a series of batch tests. The results suggested that EPS of SRB sludge possessed stronger hydrophobicity (proteins/polysaccharides (PN/PS) ratio), higher availability of adsorption sites (binding sites ( n)), and higher binding strength (binding constant ( Kb)) between EPS and CIP compared to those of AS and AnS. The findings of this study provide an insight into the role of EPS in biological process for treating CIP-laden was...Continue Reading

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Citations

Feb 12, 2019·Letters in Applied Microbiology·C N H Marques, S M Nelson
Sep 19, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Mian Laiq Ur RehmanMeiting Ju
Sep 10, 2018·The Science of the Total Environment·Harmanpreet SidhuGeorge O'Connor
Jan 27, 2019·Environment International·Mohit KumarPratyoosh Shukla
Jun 2, 2020·Environmental Science & Technology·Han-Qing Yu
Jun 28, 2019·Environmental Science & Technology·Akashdeep Singh OberoiHui Lu
Mar 7, 2020·Ecotoxicology and Environmental Safety·Jerry Collince AcharJinho Jung

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