Unused-Used: Alar Auto-Vac Rotary Vacuum Drum Filter System. Model 6120. The dewatering system consists of a precoat slurry tank, a screw conveyor for charging filter aid to the precoat tank, a rota...

Unused-Used: Alar Auto-Vac Rotary Vacuum Drum Filter System. Model 6120. The dewatering system consists of a precoat slurry tank, a screw conveyor for charging filter aid to the precoat tank, a rotary vacuum filter, a vacuum pump, single stage liquid ring, driven by 50 HP motor. Filtrate is removed from the system by a self-priming LaBour Centrifugal Pump driven by a 10 HP motor. Bags of filter aid are dumped into a hopper that feeds a screw conveyor and elevates the material into a polyethylene pre-coat slurry tank. The dumping hopper has an electrically driven bridge breaker and an electrically operated bin vibrator. The screw conveyor is driven by an electric motor mounted at the discharge end of the conveyor. The pre-coat tank is made of polyethylene and has a capacity of about 1,250 gallons. It is equipped with a top mounted agitator. Waste sludge in a digester basin normally has a solids content of 2-3%.