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Effects of Al3+ on pollutant removal and extracellular polymeric substances (EPS) under anaerobic, anoxic and oxic conditions

  • Lanhe Zhang
  • Jing Zheng
  • Jingbo GuoEmail author
  • Xiaohui Guan
  • Suiyi Zhu
  • Yanping Jia
  • Jian Zhang
  • Xiaoyu Zhang
  • Haifeng Zhang
Research Article
  • 7 Downloads
Part of the following topical collections:
  1. Special Issue—China Urban Water Environment and Water Ecology

Abstract

Aluminum ions produced by aluminum mining, electrolytic industry and aluminum-based coagulants can enter wastewater treatment plants and interact with activated sludge. They can subsequently contribute to the removal of suspended solids and affect activated sludge flocculation, as well as nitrogen and phosphorus removal. In this study, the effects of Al3+ on pollutant removal, sludge flocculation and the composition and structure of extracellular polymeric substances (EPS) were investigated under anaerobic, anoxic and oxic conditions. Results demonstrated that the highest chemical oxygen demand (COD) and total nitrogen (TN) removal efficiencies were detected for an Al3+ concentration of 10 mg/L. In addition, the maximal dehydrogenase activity and sludge flocculation were also observed at this level of Al3+. The highest removal efficiency of total phosphorus (TP) was achieved at an Al3+ concentration of 30 mg/L. The flocculability of sludge in the anoxic zone was consistently higher than that in the anaerobic and oxic zones. The addition of Al3+ promoted the secretion of EPS. Tryptophan-like fluorescence peaks were detected in each EPS layer in the absence of Al3+. At the Al3+ concentration of 10 mg/L, fulvic acid and tryptophan fluorescence peaks began to appear, while the majority of protein species and the highest microbial activity were also detected. Low Al3+ concentrations (< 10 mg/L) could promote the removal efficiencies of COD and TN, yet excessive Al3+ levels (>10 mg/L) weakened microbial activity. Higher Al3+ concentrations (>30 mg/L) also inhibited the release of phosphorus in the anaerobic zone by reacting with PO43−.

Keywords

Extracellular polymeric substances Activated sludge Aluminum ion A2Wastewater 

Notes

Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 51678119 and 51808254), the Science and Technology Development Program of Jilin Province (Nos. 20180201016SF and 20180101079JC) and the Scientific Research Foundation from Education Department of Jilin Province (Nos. JJKH20180453KJ and JJKH20180454KJ).

Supplementary material

11783_2019_1169_MOESM1_ESM.pdf (1.6 mb)
Supplementary information

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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Lanhe Zhang
    • 1
    • 2
  • Jing Zheng
    • 1
  • Jingbo Guo
    • 3
    Email author
  • Xiaohui Guan
    • 1
  • Suiyi Zhu
    • 4
  • Yanping Jia
    • 1
  • Jian Zhang
    • 1
  • Xiaoyu Zhang
    • 2
  • Haifeng Zhang
    • 1
  1. 1.School of Chemical EngineeringNortheast Electric Power UniversityJilinChina
  2. 2.Key Laboratory of Songliao Aquatic Environment, Ministry of EducationJilin Jianzhu UniversityChangchunChina
  3. 3.School of Civil and Architecture EngineeringNortheast Electric Power UniversityJilinChina
  4. 4.School of EnvironmentNortheast Normal UniversityChangchunChina

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