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Secondary Treatment – Aeration Tanks

Bacteria are added to the aeration tanks for the nitrification-denitrification process. The bacteria feed off the organic wastes in the wastewater. Oxygen is added in the nitrification process to speed up the bacteria's rate of decomposition. The nitrification-denitrification process reduces the amount of nitrogen in the plant's effluent. The wastewater, rich in activated sludge, then flows to the secondary clarifiers.