Study On The Characteristics Of Sequencing Batch Membrane Bioreactor And The Wastewater Treatment By

The sequencing batch membrane bioreactor (SBMBR), which combined sequencing batch reactor (SBR) with membrane separation technology, was developed for the nitrogen and phosphorous removal in one reactor. The characteristics of SBMBR was studied and nitrogen and phosphorous removal were examined in different operation modes with AO and AOA mode at the same time.The removal effect was investigated in the AO mode of SBMBR using simulated domestic wastewater under different carbon-nitrogen ratios (C/N=8.3 18.5). The results indicated that the NH₄⁺-N and TN removal rates could be maintained at 84% and 80%, respectively. The TP removal rates was 75.9% on average. Kinetic models in membrane bioreactor were established to predict the effluent concentrations of CODcr and NH₄⁺-N. In the treatment of actual domestic wastewater, the CODcr and NH₄⁺-N removal efficiencies were 85% and 87.8%, respectively, and the turbidity of effluent is below 1NTU. Experiments were conducted to compare the removal efficiency of nitrogen and phosphorus in simulated domestic wastewater using two SBMBRs operated in AO and AOA mode. Results showed that the removal rates of NH₄⁺-N in AO and AOA system were 94.1% and 96.9%, respectively. AOA MBR showed better removal efficiency of TN, and the average removal rate was 81.9%. The capacity of anaerobic phosphorus release in AOA MBR was higher than AO MBR and phosphorus uptake occurred both in aerobic and anoxic stages. It had better abilities in nitrogen and phosphorus removal comparing with AO MBR.