The dry weather process train processes up to 30 MGD of wastewater. Additional wasterwater flow beyond 30 MGD is diverted to excess flow facilities, where primary treatment and chlorination are provided. The wastewater is first screened through the barscreen facility and flows to the excess flow station.
When the wastewater reaches the excess flow station, it is pumped to the dual use clarifiers via 3 vertical turbine pumps. The wastewater is settled out in the dual use clarifiers and the sludge that is collected on the bottom of the tank is pumped to the head of the plant for treatment. The wastewater exits the dual use clarifiers and flows into the excess flow lagoon for further treatment. As the wastewater passes towards the back of the excess flow lagoon, it is chlorinated for disinfection purposes and exits at the 002 outfall into Flagg Creek.
EXCESS FLOW PUMP STATION
Wet weather flows are pumped to the dual use clarifiers via 3 vertical turbine pumps, which are rated at 21 million gallons each. After the excess flows leave the dual use clarifiers, it then flows into the excess flow lagoon for further treatment and chlorination.
DUAL USE CLARIFIERS
During wet weather events, secondary clarifier effluent is diverted directly to the disk filters and excess flow is pumped to the dual use clarifiers, providing primary sedimentation of all excess wastewater. The solids that are collected at the bottom of the tank are pumped back to the headworks of the plant for treatment.
After the filtered water leaves the disk filter building, it is then chlorinated with 15% sodium hypochlorite solution. The chlorine is controlled by flow pacing off of the raw sewage pump flow signal and chlorine residuals. Plant operators have the ability to chlorinate at several locations within the plant in order to maintain the permitted fecal coliform level.
EXCESS FLOW PLANT EFFLUENT OUTFALL 002
After complete treatment in accord with the applicable Environmental Standards of the State and Federal Agencies, the excess flow effluent is discharged into Flagg Creek through 002 Outfall.