Shingo TAKAWA
Influence of flocculant dosage on permeate flux and nutrients removal in carrier-added MBR system
Toshiya KOMATSUˇ¤Shuji HIMENO
One drawback of sewage treatment by membrane bioreactor (MBR) is that it requires high running cost. It is mainly caused by the high strength aeration to remove cake layer on the membrane surface for maintaining a permeate flux. Our previous study demonstrated that the addition of carriers into MBR is effective in both reducing aeration strength and improving nitrogen removal. However, removal of phosphorus was insufficient in the system.
The effects of coagulant (PAC) dosage on phosphorus removal and permeate flux in carrier-added MBR were investigated by long-term treatment of raw sewage in the present study. Three reactors were simultaneously operated for about 250 days; Run 1: MLSS 12000 mg/L without PAC; Run 2: MLSS 12000 mg/L with PAC; Run 3: MLSS 8000 mg/L with PAC. The PAC concentration was set at 2 mg-Al/L. As the results, PAC dosage was effective for removing phosphorus stably. On the other hand, PAC dosage caused a slight adverse effect on the permeatability. It was found that the dosage of PAC also led to better removal of organic matter (BOD and TOC), nitrogen, and the color degree.
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