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Open AccessArticle

Layered Extraction and Adsorption Performance of Extracellular Polymeric Substances from Activated Sludge in the Enhanced Biological Phosphorus Removal Process

by Daxue Li 1,2 and Hailing Xi 1,*
1
State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China
2
Department of Military Installations, Army Logistic University of PLA, Chongqing 401331, China
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(18), 3358; https://doi.org/10.3390/molecules24183358
Received: 1 September 2019 / Revised: 11 September 2019 / Accepted: 12 September 2019 / Published: 16 September 2019
A large amount of phosphorus was found in the extracellular polymeric substances (EPS) of activated sludge used in enhanced biological phosphorus removal (EBPR), so the role of EPS and extracellular phosphorus in EBPR should not be neglected. The composition and properties of tightly bound EPS (TB-EPS) and loosely bound EPS (LB-EPS) were significantly different, and it was necessary to study the adsorption performance of EPS through the fractionating of activated sludge into LB-EPS, TB-EPS and microbial cells. In this study, the adsorption performance of LB-EPS and TB-EPS for phosphate was explored by extracting LB-EPS and TB-EPS via sonication and cation exchange resin (CER), respectively. The results indicated that the sonication-CER method was an efficient and reliable extraction method for EPS with a synergistic effect. The performance of EPS in the adsorption/complexing of phosphate was excellent because of its abundant functional groups. Specifically, the type and content of metal elements and functional groups in TB-EPS were much greater than those in LB-EPS, which led to the key role of TB-EPS in the adsorption/complexing of phosphate. Finally, a metabolic model for EBPR with consideration of the adsorption performance of LB-EPS and TB-EPS was proposed. View Full-Text
Keywords: enhanced biological phosphorus removal (EBPR); tightly bound extracellular polymeric substances (TB-EPS); loosely bound extracellular polymeric substances (LB-EPS); phosphate; adsorption performance enhanced biological phosphorus removal (EBPR); tightly bound extracellular polymeric substances (TB-EPS); loosely bound extracellular polymeric substances (LB-EPS); phosphate; adsorption performance
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MDPI and ACS Style

Li, D.; Xi, H. Layered Extraction and Adsorption Performance of Extracellular Polymeric Substances from Activated Sludge in the Enhanced Biological Phosphorus Removal Process. Molecules 2019, 24, 3358.

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