Updated: July 2002

1. General

Upper counter-current flow type with the use of floating filter media SUPER WAKI-SHIMIZU, is one kind of rapid filters. SUPER WAKI-SHIMIZU uses plastic floating filter media instead of sand used in the conventional sand filters. Floated filter media are washed mechanically by the sludge itself in the filter tank, and the filter media and suspended solids caught are securely separated in a short time. After agitating, filter media are immediately floated and separated from sludge, and then the sludge is drained out. Simple construction without using back-wash water pump, blower and tanks, etc. enables easy maintenance.

2. Construction

A filter tank is an enclosed pressure vessel. Screens which hold floating filter media are assembled in the top, and an agitator which stirs floating filter media is assembled in the bottom of the tank. Necessary equipment for filtration such as piping and valves are assembled beneath the tank.

3. Features

1) No Mudball Phenomena
Floating filter media are washed by forced water current in the tank and even a cohesive suspension can be washed away from filter media. This allows to continue a stable operation.
2) No Backwash Water
Floating filter media can be washed by the slurry itself in the tank, and no backwash water is required. Volume of washed water drainage is 1/6 - 1/3 of conventional sand filter.
3) Highly Concentrated Slurry Can Be Treated
Long filtration is available on highly concentrated slurry with high collection efficiency of floating filter media.
4) No Filter Media flow out by the use of siphon braker.
5) Optimum filter media can be selected based on slurry characteristics and/or treated water quality requirements.

4. Application

1) Further filtration of 2nd treated water in sewage work
2) Further filtration of 2nd treated water from industrial wastewater
3) Filtration of water recycle use of industrial wastewater
4) Further filtration of industrial plant water
5) Filtration of garden pond water
6) Filtration of cooling tower water