Influence of Temperature and Dissolved Oxygen on Nitrogen and Phosphorus Removal of Integrated Bioreactor

摘要

An integrated biological membrane sewage treatment device has been designedbased on the mechanism of microorganism nitrogen and phosphorus removal and theinfluence of temperature and dissolved oxygen on nitrogen and phosphorus removal ofintegrated bioreactor with adoption of this sewage treatment device. The research resultsshows that the optimal temperature range of microorganism nitrogen and phosphorusremoval is 20-30 °C, and the effluent COD removal rate within this range maintains at over90%; NH4 -N ? removal rate is between 95% and 97%. TN removal rate is approximately81%. In practical production, the internal temperature environment of the sewage reactorshould be maintained at above 15 °C, to decrease the inhibition of low-temperatureenvironment on growth and reaction speed of nitrobacteria. In various concentrations of DOin the reactor, there is little change in the effluent COD concentration and effluent CODconcentration is influenced by temperature. With the increasing of DO concentration, botheffluent TN and TP concentrations present changing features of initially decreasing thenincreasing. The analysis of the influence of comprehensive dissolved oxygen onmicroorganism nitrogen and phosphorus removal reveals that when the concentration of DOmaintains within the range of 1.0-1.5 mg/L, the sewage purification system can attain ahigher nitrogen and phosphorus removal effect.