气水交替膜生物反应器处理生活污水效能

Gas-water alternate membrane bioreactor for domestic sewage treatment

摘要:

为更好地将气水交替膜生物反应器应用于实际工程,通过中试试验,考察该反应器对实际生活污水的处理效果.结果表明,在实际污水碳氮比为4的条件下,AMBR对COD和NH4+-N的去除率在90%左右,出水质量浓度分别低于20 mg/L和5 mg/L,但对TN的去除能力有限,出水平均质量浓度为22.4 mg/L,去除率仅为38%.通过在原水中投加葡萄糖使原水碳氮比提高至6时,AMBR对TN的去除率上升至66%左右,出水质量浓度在13 mg/L左右,能达到国家一级A标准;同时,出水中COD和NH4+-N质量浓度仍低于20 mg/L和5 mg/L.长期监测过膜阻力发现,AMBR具有很好的抗膜污染性能,长期运行过程中,TMP始终维持在-20 kPa左右.

Abstract:

The treatment efficiency by the gas-water alternate membrane bioreactor(AMBR) on domestic sewage was investigated through a pilot-scale study in order to get better application effect in the practical engineering.The results showed that: AMBR had good COD and NH4+-N removal effect when the C/N ratio of raw domestic sewage was 4,and the COD and NH4+-N concentration in effluent under 20 mg/L and 5 mg/L.But it’s not good at TN removal because of its low C/N ratio,and the TN concentration in effluent was 22.4 mg/L.When the C/N ratio of raw water increased to 6 according to adding glucose in raw domestic sewage,the TN removal efficiency by AMBR was increased to 66%,and the effluent TN was only 13 mg/L,which met the First A-level requirement of China.Meanwhile,the COD and NH4+-N removal effect by AMBR was unaffected by the change of the raw water’s C/N ration.The trans-membrane pressure was maintained about-20 kPa indicated that AMBR also had good membrane fouling alleviating effect.