How It Works
WeirWasher ACS model WWR uses the in plant service water of nominally 65 psig at 15 to 45 gpm depending upon surface area covered. Water is supplied to piping that runs under the walkway out to the center column. The piping then enters the center of the column running through the center of the drive unit. The piping proceeds down the middle of the center column and out the square holes in piping for the mixed liquor effluent. The piping proceeds down the outside of the column to the location of the WeirWasher, ACS center unit. The pipe is then connected to the center stationary unit, which allows the water to enter the center unit. The water flows between the stationary and rotating components of the center unit. The piping is then connected to the rotating component of the center unit. The clarifier drive unit drives the center unit with the rest of the rotating structure. The piping is then routed along the scum arm or along the bottom structure of the rotating structure of the tank or clarifier. The piping then is connected to the spray apparatus, which sprays the areas needing cleaning. The areas that can be cleaned are as follows:
- Scum Ring (Inside and outside)
- Weir (Inside and Outside)
- Launder (overflow, sidewall, bottom)
- Outer wall (center mounted launder designs)
The center unit during operation is designed to have a small amount of leakage. This leakage allows the center unit to ride on a small water film between the stationary and rotating components of the center unit minimizing the horsepower necessary to rotate the rotating component of the center unit.