Preliminary and primary treatment . Plant influent flows are metered by parshall flume and sent to aerated degritting, followed by comminution and primary clarification for removal of scum and primary sludge. Grit and scum are disposed to secure landfill. Secondary treatment, solids removal, disinfection, and effluent discharge . Primary effluent is pumped to the trickling filters where it flows over plastic cross-flow media.
Secondary clarification removes additional scum and sludge.
Primary and secondary sludges are collected and stored in two aerated sludge holding tanks. Solids handling . Stored sludge is treated with polymer and sodium hypochlorite to promote improved handling and odor control. Polymer dosing averages 11 pounds per ton of dry solids. The co-thickened sludge averages 3.5 percent solids.