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Environmental Science and Pollution Research

, Volume 25, Issue 36, pp 36680–36692 | Cite as

Insights into the role of extracellular polymeric substances in Zn2+ adsorption in different biological sludge systems

  • Yu-Xia Song
  • Cheng-Hai Lu
  • Peng Liu
  • Xi-Lin Chai
  • Xi Chen
  • Xiao-Bo Min
  • Chong-Jian Tang
  • Li-Yuan Chai
Research Article
  • 32 Downloads

Abstract

The adsorption behavior of Zn2+ in four different biological sludge systems, i.e. activated sludge, denitrification sludge, short-cut nitrification sludge, and anammox granules, was investigated. The results indicated that all sludge samples possessed considerable potential for Zn2+ adsorption. Short-cut nitrification sludge possessed the highest Zn2+ maximum adsorption capacity (qm) of 36.4 mg g SS−1, which was much higher than other sludges applied (12.8–14.7 mg g SS−1). Besides, the adsorption rate for short-cut nitrification sludge was fastest among the four types of sludge after fitting with a pseudo-second-order rate equation. Comparing with the physicochemical properties of the four sludges, the soluble extracellular polymeric substances (EPS), especially soluble polysaccharide (PS), played a prior role in binding metal cations (i.e., Zn). The present study also showed that with less than 30% of Zn2+ trapped by EPS, 61.6–71.9% of Zn2+could be harvested directly by cells, indicating that the protecting capability by EPS was limited. Therefore, it is important to remove metal ions as early as possible if the activated sludge processes encountered high stress of heavy metal.

Graphical abstract

Keywords

Activated sludge Zinc Adsorption EPS Anammox Nitrification 

Notes

Funding information

This work is partially supported by the National Natural Science Foundation of China (51878662, 51674305), the key projects of the Science and Technology of Hunan Province (2017SK2420), the Innovation-Driven Project (2017CX010) of Central South University, and the Opening Fund of Jiangsu Key Laboratory of Anaerobic Biotechnology (Jiangnan University) (JKLAB201706). Dr. Tang C.-J. is supported by the 2017 Huxiang Provincial Scholar Program (2017RS3005).

Supplementary material

11356_2018_3451_MOESM1_ESM.docx (6.9 mb)
ESM 1 (DOCX 7032 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Environmental Engineering, School of Metallurgy and EnvironmentCentral South UniversityChangshaChina
  2. 2.Chinese National Engineering Research Center for Control & Treatment of Heavy Metal PollutionChangshaChina
  3. 3.The Jiangxi Provincial Collaborative Research Institute for Environmental Protection IndustryWannianChina

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