DO对膜曝气生物反应器同步除碳脱氮的影响

为获得膜曝气生物反应器(membrane aerated bioreactor,MABR)处理污水同步除碳脱氮的最佳DO质量浓度,构建以亲水性聚丙烯中空纤维膜为曝气膜组件的MABR,在80 d连续运行的时间内,考察DO质量浓度对MABR处理模拟生活污水同步除碳脱氮效果的影响.结果表明:在水力停留时间8 h、膜表面COD...

Effect of DO on simultaneous removal of carbon and nitrogen by a membrane aerated bioreactor

In order to achieve an optimum DO for simultaneous carbon and nitrogen removal by the Membrane Aerated Bioreactor(MABR)treating wastewater,a MABR in which the hydrophilic polypropylene hollow-fiber membrane module was used was constructed,and the effect of DO on simultaneous removal of carbon and nitrogen by MABR treating synthetic wastewater was investigated during the 80 days’ continuous operation.The results show that under the relative stable condition that hydraulic retention time(HRT)was 8 h,and the membrane surface loading rate was 3.7 g·m-2·h-1(COD)or 0.36 g·m-2·h-1(TN),MABR realized preferable simultaneous removal of carbon and nitrogen when DO was 0.5 mg/L around.The removal rate of COD,NH4+-N and TN was 80%,86.4% and 66.5%,respectively.When DO was 4 mg/L or 2 mg/L around,both COD and NH4+-N removal rate rose to more than 88%,but denitrification was limited,which resulted in a poor TN removal,with the former TN removal rate being 10% and the latter 24%.When DO dropped to 0.1 mg/L around,COD and NH4+-N removal rate decreased to 60% and 57.4%,respectively,and TN removal rate also decreased to 46.8%.It was suggested that DO in the mixed liquor of MABR should be controlled at 0.5 mg/L around for an effective simultaneous carbon and nitrogen removal.