Abstract
Coagulation direct membrane filtration was studied for eutrophic lake water containing algae. The effects of three levels of coagulant injection (0, 5, and 30 mg/L as iron chloride (FeCl3)) on membrane filtration were studied. Laboratory–scale constant–pressure filtration experiments showed that 30 mg/L FeCl3 was the preferred filtration condition with a higher injection volume of coagulant, similar to previous studies. Conversely, the results of the pilotscale constant flow filtration experiments showed that 5 mg/L FeCl3 was the preferred filtration condition, while 30 mg/L FeCl3 resulted in reversible foulant accumulation due to poor discharge of reversible foulants from the membrane module. Consequently, a pilot–scale of coagulation direct membrane filtration was conducted, and stable operation for 37 days was achieved with 5 mg/L FeCl3. This study demonstrated that coagulation direct membrane filtration is feasible for algae–rich water on a pilot–scale.
