Improved integrated anaerobic–anoxic–oxic system for landfill leachate treatment using domestic wastewater as carbon source: Performance study and optimization

Yanwu ZHOU, Juan ZHOU, Jianheng YU, Xia HUANG, Xiaojun NIU, Yiu Fai TSANG

Research output: Contribution to journalArticlespeer-review

3 Citations (Scopus)

Abstract

Landfill leachate has been treated by using an anaerobic–anoxic–oxic (A²/O) system at Datansha Wastewater Treatment Plant in Guangzhou, South China for nearly five years. Through the pilot-scale testing and engineering experiments, the impulse loads of the wastewater treatment systems were successfully reduced. The results showed that the highest removal efficiencies of chemical oxygen demand (COD), ammonium-nitrogen (NH₄⁺-N), and total nitrogen (TN) for the combined treatment of domestic wastewater and landfill leachate were achieved under the operating conditions of hydraulic retention time = 11 h, dissolved oxygen = 3 mg/L, mixed liquid return ratio = 200%, and sludge return ratio = 80%. Compared with the data obtained from the previous operating A²/O system, the removal efficiencies of COD, NH₄⁺-N, and TN increased by 5.6%, 9.8%, and 5.3%, respectively, under the optimal operating conditions for one year. The average effluent concentrations of BOD₅, COD, NH₄⁺-N, TN, and total phosphorus were 12.4, 29.9, 2.5, 18.0, and 0.5 mg/L, respectively, and these values could be kept below standard discharge limits in China. Copyright © 2023 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)997-1002
JournalProcess Safety and Environmental Protection
Volume174
Early online dateMay 2023
DOIs
Publication statusPublished - Jun 2023

Citation

Zhou, Y., Zhou, J., Yu, J., Huang, X., Niu, X., & Tsang, Y. F. (2023). Improved integrated anaerobic–anoxic–oxic system for landfill leachate treatment using domestic wastewater as carbon source: Performance study and optimization. Process Safety and Environmental Protection, 174, 997-1002. doi: 10.1016/j.psep.2023.05.012

Keywords

  • A²/O system
  • Landfill leachate
  • Simultaneous nitrification and denitrification
  • Wastewater treatment

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