Schreiber uses air to agitate the waste stream so that grit will separate from the organics well. The long rectangular channel design assures that the detention time and rolling effect created by the air allows for the best removal of grit. Grit then settles to the bottom of the grit channel and is removed via a grit pump to the grit classifier. The flow into the grease channel is quiescent so that the grease can rise to the surface of the channel. Air lances are positioned above the water surface and air is directed towards the surface to move the grease down the channel to the auger extraction point. The new Schreiber Grit and Grease parallel channel design was selected and is performing well.

The engineer and owner decided to move away from chlorination/de-chlorination disinfection that was currently being used at the existing facility. UV disinfection was determined to be the best solution for the new fecal disinfection standard of less than or equal to 23 fecal coliform/100 ml based on a 30 day geometric mean.

Civil Engineering Consultants researched the various UV systems on the market and invited Trojan Technologies to provide a proposal for Cumming. Trojan’s approach to the solution not only included an efficient UV disinfection system design, but also included local service and parts availability in Georgia, as provided by the local factory trained equipment representative, Templeton & Associates Engineering Sales and TEMSCO. Trojan’s proposal was selected as the best approach and included in the plant expansion.