Use of submerged anaerobic-anoxic-oxic membrane bioreactor to treat highly toxic coke wastewater with complete sludge retention
Journal
Journal of Membrane Science
Journal Volume
330
Journal Issue
1-2
Pages
57-64
Date Issued
2009
Author(s)
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. © 2009 Elsevier B.V. All rights reserved.
Subjects
Coke wastewater; Complete sludge retention; Membrane bioreactor; Membrane filterability; Microbial characteristics
SDGs
Other Subjects
Biological activities; Chemical oxygens; Colloidal fractions; Complete sludge retention; Industrial effluents; Membrane bioreactor; Membrane filterability; Microbial characteristics; Microbial diversities; Pollutant removal efficiencies; Sludge productions; Suspended solids; Biochemical oxygen demand; Bioconversion; Bioreactors; Chemical cleaning; Coke; Effluent treatment; Effluents; Industrial chemicals; Industrial water treatment; Membrane fouling; Membranes; Oxygen; Removal; Sewage; Suspensions (fluids); Toxic materials; Turbidity; Wastewater; Wastewater reclamation; Water recycling; Wastewater treatment; coke; anaerobic reactor; article; biological activity; chemical oxygen demand; controlled study; membrane reactor; microbial community; microbial diversity; microbial growth; microbial viability; priority journal; sludge; sludge treatment; supernatant; turbidity; waste water management; water pollution
Type
journal article