PAC对膜产水量和MBR净化效能的影响研究

Study on effect of adding PAC on membrane flux and treatment performance in MBR

以MBR处理啤酒废水为例,考察了PAC投加量对膜产水量的影响,在PAC投量为0、0 5、1 0、2 0g/L时,所对应的稳定膜产水量分别为22、28、33和35mL/min,即PAC投量的增加有助于提高膜的稳定产水量,同时发现,随着PAC投量的增加,膜稳定产水量的增加量逐渐减少,因而应该合理地确定PAC的投加量.在PAC投量为1.0g/L的条件下,考察了MBR对COD和TN去除效果的影响,发现在PAC投加初期,反应器对COD和TN的去除率都有明显提高,但运行大约10d以后,PAC的作用不再明显.

As a case of using MBR treating brewery wastewater, the effect of amounts of adding PAC on membrane flow was tested. The stable membrane flow was 22,28,33 and 35 mL/min respectively as the amounts of adding PAC were 0,0.5 ,1.0 and 2.0 g/L, so raising PAC adding amounts was helpful to improve membrane flow. However, it was also found that the improving amounts of membrane flow decreased gradually with the increasing of PAC adding amounts, so the amounts of adding PAC should be determined properly. Under the condition of adding PAC 1.0 mg/L, the removal efficiencies of COD and TN were studied. During the initial period of adding PAC, COD removal efficiency and TN removal efficiency by bioreactor were both improved. But after 10 day's operation, the effect of improving the removal efficiencies of COD and TN by PAC was not obvious.