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Waste Water Treatment Plant Treatment Processes Wastewater Treatment Process Raw wastewater entering the plant is screened to remove large objects and rags. Flow to the influent control structure diverts flow in excess of 25 MGD to the North Grit Facility and into the Flow Equalization Basin for temporary storage and or primary treatment. Flow to the South Grit Facility continues on to the Pre Air Tanks. It then flows to the Primary Settling Tanks where solids and scum are removed. It continues on to the Aeration Tanks for secondary treatment. This is where finely suspended and soluble organic pollutants are biologically converted into an insoluble matter called mixed liquor. From aeration, it then flows to the Final Settling Tanks and the suspended matter is separated from the remaining wastewater. The treated wastewater from final settling flows to the Chlorination Facility where it is disinfected and then dechlorinated before being discharged into the Rocky Fork of the Mohican River. Sludge Treatment Process All contaminants removed from the wastewater are in the form of primary or secondary sludge. The flows are then combined and pumped to Rotary Screens to remove rags and debris. Once screened, the sludge is sent to the Thickener Tanks to allow solids to settle out to a higher concentration. At this point the sludge is pumped to the Anaerobic Digesters where the organic portion of the sludge is biologically broken down into carbon dioxide, water and methane gas. The methane gas is used as fuel for the plants gas driven air blowers which also provide heat for the plants building’s. The digested sludge is withdrawn and dewatered to a semi-solid cake using the two Sludge Filter Presses. The filtered cake is then disposed of on site in a seven-acre sludge landfill area. All drainage from area is collected and recycled back through the plant. The Pretreatment Program The
National Pretreatment Program is a cooperative effort of federal,
state, and local regulatory environmental agencies established to
protect water quality. The program is designed to reduce the level of
pollutants discharged by industry and other non-domestic wastewater
sources into municipal sewer systems.
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