Use of submerged anaerobic-anoxic-oxic membrane bioreactor to treat highly toxic coke wastewater with complete sludge retention

Wen Tao Zhao, Xia Huang, Duu Jong Lee, Xiao Hui Wang, Yue Xiao Shen

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Coke wastewater is an extremely toxic industrial effluent that requires treatment before discharge. A bench-scale, anaerobic-anoxic-oxic membrane bioreactor (A1/A2/O-MBR) system was utilized to treat real coke wastewater with complete sludge retention. In a 160-d test, the A1/A2/O-MBR system stably removed 87.9 ± 1.6% of chemical oxygen demand, 99.4 ± 0.3% of turbidity, and 99.7 ± 3.5% of NH4+-N from coke wastewater. The membrane rejected almost all suspended solids; hence, a low food-to-microorganism environment was created to degrade refractory substances and reduce sludge production rates. The microbial diversity in the MBR system declined over time; however, neither pollutant removal efficiency nor total biological activity was adversely affected. Membrane fouling, which occurred during the operation of the MBR system, was principally resulted from the colloidal fraction of supernatant in suspension. Physical cleaning removed initial deposits of particles; however, prolonged operation resulted in severe clogging that can only be removed by chemical cleaning. An A1/A2/O-MBR system with short intermittent physical cleaning was recommended for coke wastewater treatment.

Original languageEnglish
Pages (from-to)57-64
Number of pages8
JournalJournal of Membrane Science
Volume330
Issue number1-2
DOIs
StatePublished - Mar 2 2009

Keywords

  • Coke wastewater
  • Complete sludge retention
  • Membrane bioreactor
  • Membrane filterability
  • Microbial characteristics

Fingerprint Dive into the research topics of 'Use of submerged anaerobic-anoxic-oxic membrane bioreactor to treat highly toxic coke wastewater with complete sludge retention'. Together they form a unique fingerprint.

Cite this