CHEMICAL WASHING METHOD FOR DYNAMIC FILTRATION BODY AND DYNAMIC FILTRATION DEVICE

摘要

PROBLEM TO BE SOLVED: To maintain a filter flow flux and filtered water quality stable for a long period of time by effectively removing the clogging of sludge, etc., accumulated in the slime layers sticking to a dynamic filtration body and within the fibers of filter cloth and the cake layers fixed by compaction without taking the dynamic filtration body out of an aeration tank and without filling the inside of the aeration tank with washing liquid chemicals. SOLUTION: This chemical washing method for the dynamic filtration body consists in introducing the washing liquid chemicals to the secondary side of the dynamic filtration body. A tank 27 for the washing liquid chemicals and an injection pump 26 are disposed in order to introduce the washing liquid chemicals into the secondary side of the dynamic filtration body 11. This filtration body 11 is formed by mounting the filter cloth 15 to a hollow box-like main body 14 having an opening 12 so as to cover the opening 12. Filtration is executed by a water level difference and the filtered water flows out of a water collecting trough 9 to a treated water tank 10.