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DOI : ,    Vol.10, No.3, 47 ~ 56, 2002
Title
Relationship between coagulation and filtration and filter operating
김상구Sang Goo Kim,최근주Keun Joo Choi,오형석Hyeong Seok Oh,노재순Jai Soon Noh,황영도Young Do Hwang,박은주Eun Ju Park,손희종Hee Jong Son,신판세Pan Se Shin
Abstract
Coagulation and filtration are basic treatment processes in rapid filtration system. Good performance of coagulation process can produce high quality of filtered water which is lower turbidity and particles water. Many factors which effect to coagulation are introduced by many studies but these results of studies are almost impossible to adjust to constructed water treatment processes. Therefore optimum design is very important for producing required water quality. We have researched variations of filtered water quality by coagulation conditions after back wash with filtration time. The most effective factor for a good coagulation is coagulant dose however inject point of coagulant had no effect to producing good filtered water and the lower mixing energy produced good filtered water than higher mixing energy. The period of direct filter`s maturing after coagulant dose is within ten minutes, it will be good indicator for a good coagulant dose. Long time of only air scour did not need to detach floc from filter media because floc detaching occurred not air scour alone but high rate of up flow water by air pressure, after the water in the underdrain moved to the surface of filter by air pressure, the turburance of filter media is stopped. Longer air scour did not effected to media disturbing, so for more achieve effectiveness of air scour, reair scour should be carried out after refill the back wash water in the space of underdrain.
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