Removal efficiency of ibuprofen and fenoprofen in aerobic/anoxic sequential batch reactor
Ibuprofen(IBU)and fenoprofen(FENO)pose potential ecotoxic and biocumulative risks to aquatic ecosystems and human health due to their difficult degradation and bioenrichment.To investigate the removal of chemical oxygen demand(COD),total nitrogen(TN)and new pollutants ibuprofen(IBU)and Fenoprofen(FENO)from pharmaceutical wastewater by aerobic/anoxic suspension sequencing batch reactor(O/ASSBR).The hydraulic retention time(HRT)of O/ASSBR is 24 h,the dissolved oxygen is 2.0 and 0.4 mg/L in aerobic stage and anoxic stage,respectively.The removal efficiency of COD,NH4+-N,TN,IBU,and FENO was 87.74%～89.36%,76.52%～96.75%,69.92%～93.94%,90.01%and 91.57%,with hydraulic retention time(HRT)of 24 h,the dissolved oxygen concentration of 2.0 mg/L and 0.4 mg/L for aerobic and anoxic stage,various loadings of COD(1.2～10 kg/(m3·d)),ammonia(NH4+-N,4.3～6.3 g/(m3·d)),IBU(1.71～5.1 mg/(m3·d)),and FENO(0.39～2.1 mg/(m3·d)).The microbial analysis of active sludge showed that microorganisms were mainly Gram-positive bacteria,where some effective microbes including Bacillus pseudomycoides,Rhodococcus rubber,and Vibrio mediterranei had a high toxicity resistance towards IBU and FENO.Effective microbes in O/ASSBR system could efficiently degrade IBU and FENO in pharmaceutical wastewater,thus O/ASSBR system has good application potential in the treatment of pharmaceutical wastewater.
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