TY - JOUR
T1 - Use of submerged anaerobic-anoxic-oxic membrane bioreactor to treat highly toxic coke wastewater with complete sludge retention
AU - Zhao, Wen Tao
AU - Huang, Xia
AU - Lee, Duu Jong
AU - Wang, Xiao Hui
AU - Shen, Yue Xiao
N1 - Funding Information:
This work was supported by the National Science Fund for Distinguished Young Scholars (no. 50725827).
PY - 2009/3/2
Y1 - 2009/3/2
N2 - 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.
AB - 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.
KW - Coke wastewater
KW - Complete sludge retention
KW - Membrane bioreactor
KW - Membrane filterability
KW - Microbial characteristics
UR - http://www.scopus.com/inward/record.url?scp=60549088073&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2008.12.072
DO - 10.1016/j.memsci.2008.12.072
M3 - Article
AN - SCOPUS:60549088073
SN - 0376-7388
VL - 330
SP - 57
EP - 64
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1-2
ER -