Long-term operation of submerged membrane bioreactor for the treatment of high strength acrylonitrile-butadiene-styrene(ABS)wastewater:effect of hydraulic retention time

摘要

In this study,the feasibility and the treatment efficiency of treating ABS industrial wastewater by an aerated submerged membrane bioreactor(ASMBR)was investigated.Through a long-term experiment,biomass,biological oxygen demand(BOD_5,)chemical oxygen demand(COD),total organic carbon(TOC)and permeate flux were measured to evaluate the MBR performance.The results show that a hydraulic retention time(HRT)of 18 h leads to the highest biomass concentration,a maximum mixed liquor suspended solids(MLSS)value of approximately 35 g/L.Chemical membrane cleaning was employed twice,after 131 and 180 days of operation in the total experimental period of 204 days.The membrane bioreactor led to superior COD and BOD_5 removal in ABS wastewater compared to the conventional biological treatment.