Page 17 - Simplified Wastewater Treatment Fundementals\Package Plants

Package Plants

Package Plant Operation

Simple package plants do not include grit removal. As a result, compartmental tanks

need to be drained and cleaned with frequency, or grit accumulation will in time cover

air diffusors, reduce volume capacity and hydraulically short circuit treatment tanks.

Pumping sludge is achieved by either submersible pumps, or by an air lift system. Air

lift systems as operated with compressed air, allowing sludge to be lifted and moved

in or out of a treatment tank. Air lift systems are dependent on clean airways, a

reliable air compressor and clear sludge piping.

Sludge Wasting is achieved by pumping, or air lifting mixed liquor from the aeration

tank to the aerobic digester tank. Wasting should never be intuitive or a guess, but

instead should be calculated based on an established sludge residence time SRT.