A/O-MBR工艺不同污泥停留时间下脱氮效能的分析  

Nitrogen Removal in an Anoxic/Oxic-Membrane Bioreactor at Different Sludge Residence Time

作　　者：高秀红[1] 高大文[1] 

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2011年第11期97-101,共5页Journal of Northeast Forestry University

基　　金：全国优秀博士学位论文专项基金(200544);黑龙江省杰出青年基金(JC200909)项目资助

摘　　要：采用缺氧/好氧膜生物反应器(A/O-MBR)工艺处理模拟生活污水,考察了不同污泥停留时间tsr(10、30、60 d)下反应器的脱氮效能。在A/O-MBR工艺中,tsr对化学需氧量和NH4+-N的去除效果无显著影响,化学需氧量平均去除率在95.4%以上,NH4+-N去除率在98.0%以上,出水化学需氧量与NH4+-N质量浓度均在15 mg/L和1 mg/L以下;缺氧段出现了明显不同的NO 2--N积累,积累量随tsr的延长而减弱,即顺序为tsr10 d>tsr30 d>tsr60 d;好氧段上清液中NO 3--N的质量浓度在tsr为10 d和60 d时较低,有利于系统获得较高的总氮去除率;总氮的平均去除率在tsr为10、30、60 d时分别为66.2%、57.2%和67.7%,出水口总氮均在20 mg/L以下。试验结果表明:A/O-MBR在tsr为10、60 d时对污染物的去除均取得了较好的效果,但较长的tsr可以减少剩余污泥的产生及排放。从经济角度来讲,tsr为60 d可为最佳污泥龄。A study was conducted to investigate the removal efficiency of nitrogen in an Anoxic/Oxie-Membrane Bioreaetor （ A/ O-MBR） at different sludge residence time （ 10, 30, 60 days） using synthetic wastewater. Result showed that sludge residence time （SRT） had no obvious influences on the removal of chemical oxygen demand and NH4^＋-N. The average removal rates of chemical oxygen demand and NH4^＋-N were 95.4% and 98.0% , and the concentrations of chemical oxygen demand and NH^4＋-N in the effluent were under 15 mg/L and 1 mg/L, respectively. There were significantly different accu- mulations of NO2^--N in the anaerobic reactor, and the concentration reduced with the extended SRT. The accumulation of NO2^--N at SRT of 10-day was the highest, followed by SRT of 30-day and 60-day. The NO3^--N concentration of the supernatant liquor in the aerobic bank was lower at SRT of 10-day and 60-day, which would be in favor of the removal of total nitrogen, The average removal rates of total nitrogen were 66.2%, 57.2% and 67.7% for SRT of 10-day, 30-day and 60- day, respectively. The total nitrogen concentrations in the effluent were under 20 mg/L. Results suggested that the pollutant removal efficiency in wastewater was higher at SRT of 10-day and 60-day, but longer SRT could reduce the production and discharge of excess activated sludge. From an economic point of view, 60d is an appropriate SRT.

关 键 词：亚硝酸盐积累 反硝化 污泥停留时间 

分 类 号：X505[环境科学与工程—环境工程]