Anoxic/aerobic membrane bioreactor for high-loading ammonia nitrogen wastewater treatment

Anoxic/aerobic membrane bioreactor was used to treat high-loading ammonia nitrogen wastewater.The nitrification and denitrification performance and the sludge characteristic property were studied.The experimental results showed that the removal rate of NH4+-N was over 99% and the average effluent NH4+-N was 1 mg/L when pH,DO and T were maintained appropriately and the NH4+-N volumetric loading rate were maintained under 1.5 kg NH4+-N/(m3·d).When volumetric loading rate,C/N,return flow ratio was 1.0 kg NH4+-N/(m3·d),3.2 and 3,the removal rate of NH4+-N and total nitrogen were 99%,83.34% respectively.The MLSS in the anoxic and oxic reactor stabilized at 6.5～7.0 g/L and 9.5～10.0 g/L respectively.The VSS/SS of both stabilized at 89%,it proved that there is no inorganic component accumulation in MLSS.