内置转盘式膜-生物反应器处理污水的工艺条件研究

对内置转盘式膜-生物反应器(SRMBR)处理污水工艺进行了研究.进水COD 160～368 mg/L时,出水COD在运行1d后降低到20 mg/L以下,去除率大于90%;转盘式膜组件的转速在0～25 r/min范围内,平衡膜通量随转速增大而快速增加,继续增大转速则平衡膜通量的增加变得不显著;在一定范围(0～1min)内延长停抽时间有助于缓解膜污染;SRMBR在较低的气水比(15∶1)下运行,也可达到较高的平衡膜通量.研究表明,SRMBR在最佳组合操作条件(转速为25r/min,抽/停为9min/1min,气水比为15∶1,抽吸压力为25kPa)下运行,其平衡膜通量高达53.75L/(m²·h).

Study on the Process for wastewater treatment in Submerged Rotating Membrane Bioreactor

The process for wastewater treatment in submerged rotating membrane bioreactor (SRMBR) was studied. It was found that the effluent COD reduced to 20 mg/L after one day running when the influent COD varied from 160 mg/L to 368 mg/L. The equilibrium membrane flux increased rapidly with increasing rotation speed of membrane in the range of 0 to 25r/min. Within one minute, the increase of suspended suction time could alleviate the membrane fouling. Moreover, higher membrane flux could be reached even at lower aeration/water ratio (15:1) in SRMBR process. The optimum processing condition was suggested as follows: the rotation speed was 25r/min, suction time/suspended time was 9 min/1 min, aeration/water ratio was 15/1, and operation pressure was 25kPa. Under this condition, the equilibrium membrane flux could reach 53.75 L/(m2 x h).