厌氧反应器与好氧MBR组合工艺处理毛纺印染废水试验研究

采用厌氧反应器与膜生物反应器(MBR)组合工艺处理毛纺印染废水,结果表明,当进水COD、BOD₅和色度分别为128～321 mg/L、36～95 mg/L和40～70倍时,出水COD、BOD₅、色度、浊度的平均值分别为36.9 mg/L、3.7 mg/L、21倍、0.24 NTU,平均去除率分别达到80.3%%、95%、59%、99.3%,达到生活杂用水水质标准.在本研究中,开发了一种新型的利用生物反应器内液位水头重力驱动连续出水的重力出流式膜生物反应器.在保留MBR处理效率高等优点的同时,省去传统的一体式MBR出水抽吸泵及复杂的反冲洗设备.整个系统结构紧凑,投资少,操作简便.选择合适的曝气量有助于提高膜通量,且可降低膜阻力的上升速率,有利于膜污染的控制.

Printing and Dyeing Wastewater Treatment Using Combined Process of Anaerobic Bioreactor and MBR

This paper describes a labor-scale experiment for printing and dyeing wastewater treatment of woolen mill using a combined process of an anaerobic reactor and a membrane bioreactor (MBR). The experimental results showed that when the concentration of COD, BOD5 and color in the influent were 128-321 mg/L, 36-95 mg/L and 40-70 dilution times (DT), the average concentrations of COD, BOD5, color and turbidity in the effluent were 36.9 mg/L, 3.7 mg/L, 21 DT and 0.24 NTU, respectively, and the corresponding removal rates were 80.3%, 95%, 59% and 99.3%, respectively. A new integrated membrane bioreactor by gravity drain of liquid level in the bioreactor was developed in this study. It not only lessens suction pump for effluent and controlling unit comparing to the traditional integrated membrane bioreactor, but also has the characters of high and continuous flux, concise configuration and simple operation and maintenance. According to the experimental results, the air flow rate through the membrane module is a significant factor to affect the flux rate and cake layer deposited on the membrane. With application of optimal air flow rate, it is effective to reduce membrane fouling and maintain high flux rate.