Treatment of Wastewater from a Toilet for Reclamation with A Airlift External Recirculated Membrane Bioreactor
气升循环分体式膜生物反应器再生回用厕所污水的研究

A new type membrane bioreactor(MBR) coupled with a separated immersed membrane unit was studied for treatment of wastewater from a toilet and for reclamation of the treated water. The results showed that the effluent of the MBR was stable with COD < 47 mg/L, BOD5 < 8.5 mg/L, NH3-N < 20 mg/L, when the influent concentration was COD 440-970 mg/L, BOD5 307-612 mg/L, NH3-N 59-111 mg/L. The treated water could meet the standard of reused water for toilet washing issued by the Ministry of Construction P.R. China. The sludge loading, volume loading, HRT and their impaction to COD of effluent were studied. Appropriate sludge loading, volume loading were respectively 0.1 kg/(kg.d), 1 kg/(m3.d) and HRT 7-8 hour. The effect of mixed liquid suspendend solid(MLSS), temperature and permeating time of the MBR to the membrane fluxes were discussed in this paper.