The next phase of the wet weather treatment process is primary treatment. Wet weather flow leaving the influent relief pump station is routed to vortex type grit separators to remove the grit, rock, and sand from the wastewater. A mechanical bar screen is available for backup in case the fine screen malfunctions. Wet weather flow enters the influent relief pump station through fine screens. When the flow coming to the plant exceeds the capacity of the influent pump station, the wet weather system is activated. Liquid sodium bisulfite is injected in the plant effluent after chlorination to remove the chlorine before it is released to the Tennessee River. Sodium hypochlorite is injected into the water to disinfect the treated plant effluent. The cleaned wastewater leaves the secondary clarifiers and enters a chlorine contact tank. Mighty Microbe Character Cards with Real Pics of Microbes.pdf A portion of the (RAS) flow called waste activated sludge (WAS) is pumped to thickeners to be thickened before dewatering. The (RAS) pumps return a portion of the sludge back to the activated sludge system to keep the food chain going for the microorganisms in the secondary influent wastewater. Sludge collected in the secondary clarifiers flow by gravity to a return sludge pump station. Wastewater called mixed liquor flows from the activated sludge system to secondary clarifiers. High purity oxygen is supplied for the microorganisms in the activated sludge system by an on-site, cryogenic air separation plant. Microorganisms are used to convert suspended and dissolved solids to settleable solids. The secondary treatment process is a biological activated sludge high purity oxygen process. Equalization pumps pump the wastewater from the basins to the activated sludge process. Blowers provide air to the equalization basins to keep the solids suspended and prevent the wastewater from going septic. The equalizations basins are used to store water during high flow conditions and to create a constant flow rate to the secondary treatment system. The treated primary wastewater next enters the equalization basins before secondary treatment. Raw sludge is pumped to the gravity sludge thickeners and floating scum is removed and screened and dewatered through rotating basket type screens. Raw sludge and floating scum is collected in the primary system. 25 inches in size.įlow leaves the grit removal system and enters the primary settling basins. The screens remove cigarette filters and other pieces of debris smaller than. After screening, the wastewater is pumped to the grit removal system and more screening.ĭetritors are used to remove grit, rock, sand and gravel from the raw wastewater before it passes through fine screens The screens remove large pieces of paper, rags, leaves, plastic bottles and tin cans. Raw wastewater enters the Moccasin Bend WasteWater Treatment Plant influent pump station wet well through bar screens. HISTORY of Wastewater Treatment in the U.S. MAP Process Legend Liquid Handling Systems Permit Number TN0024210 Summary Descriptions of Moccasin Bend Wastewater Plant Systems
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