膜面积负荷对气水交替MBR处理污水的影响

Effect of membrane surface loading on wastewater treatment by a gas-water alternate membrane bioreactor

摘要:

为提高气水交替膜生物反应器的处理效率,充分利用膜组件,通过小试试验,考察膜面积负荷对该工艺处理模拟生活污水的影响．结果表明,在膜腔供氧压力不超过200 kPa、原水碳氮比为10左右的条件下,AMBR对COD、NH₄+-N和TN的最大膜面积去除负荷分别为84.9、6.75和6.5 g／(m²·d)．对于AMBR去除COD,供氧速率是限制其去除效果的关键因素;供氧速率和硝化速率两者对NH₄+-N的去除均有影响;而硝化速率是限制TN去除的关键因素．

Abstract:

To improve the treatment efficiency of a gas-water alternate membrane bioreactor (AMBR) and make full use of the membrane module, the efficiency of membrane surface loading on synthetic municipal wastewater treatment by the AMBR was investigated through a lab-scale experiment. The results showed that: the maximum COD, NH₄+-N and TN removal load by AMBR were 84.9,6.75 and 6.5 g／(m²·d) under the condition of intra-membrane oxygen pressure lower than 200 kPa and the C／N ratio of raw water was 10. The oxygen supply rate and nitrification rate were the main factors for COD and TN removal by AMBR separately, but both of the oxygen supply rate and nitrification rate influenced the NH₄+-N removal.