生物粉末活性炭微过滤法对废水回收的利用

Study on waste water reclaim with biological powder activated carbon using microfiltration

基于对生物粉末活性炭(BPAC)微过滤(MF)系统在废水回收和回用中作为非传统工艺的研究作了评估.系统在活性炭质量浓度为20g/L,水温25℃,跨膜压力为55kPa的条件下运行.发现有机去除主要在膜组件发生,这是由粉末活性炭在膜组件发生的累积引起.平均有机去除率为83%,致使出水TOC质量浓度在1～2mg/L.在水温为15℃下该工艺的运行效果没有变差,此时有机去出率为89 6%.认为较低水温时的高有机去除率主要是因为通过提升跨膜压力至82kPa使膜的渗流速度保持在同一大小,微生物的自身分解减少.BPAC-MF系统对细菌的去除明显.从研究状况下的物料平衡来看,99 9997%的进水大肠杆菌Qβ从系统中去除.

Evaluation was given on the nontraditional techniques-biological powder activated carbon and micro filtration (BPAC-MF) system in wastewater reclaim. The system is run at the conditions of the density of activated carbon is 20 g/L, the temperature of water is 25 ℃ and the pressure is 55 kPa. It is found that the organics were mainly removed on membrane equipment. The average organic removal efficiency is 83%, and the TOC of effluent is 1～2 mg/L. Under the temperature of 15 ℃,the running effect doesn't change and the efficiency is 89.6%. The reason of average organic removal efficiency increase at a lower temperature was that the transmembrane pressure was increased to 82 kPa to keep the membrane pressure penetrate velocity balance and the degradation of bacteria was decreased. The average removal efficiency of bacteria is evident in BPAC-MF. From the equilibrium of materials, 99.999 7% colifilm was removed. Especially, colifilm can be removed effectively by activated carbon adsorption. Even if the density of activated carbon is 0.55 g/L, after one hour contacted time, the removal efficiency is (99.999%. It) is obvious that the removing of bacteria is nonactivated.