The enclosed flow schematic details both the wastewater process flow and solids flow through the plant. Raw wastewater comes into the plant via 3 different pipes, combining into a single 39 inch diameter pipe that flows into the headworks building where preliminary treatment occurs. From there, water flows to primary settling tanks, trickling filters, aeration tanks, secondary settling tanks, through disc filters and ultraviolet disinfection, and then out a 24 inch pipe to the west end of the Sauk River.
The treatment process produces waste solids at several points in the plant. Grit solids are collected at the headworks building and are disposed of in a landfill. Sludge solids are collected from the bottom of the secondary settling tanks and "co-settled" in the primary settling tanks. The co-settled solids are treated in anaerobic environment in the four digesters and then stored in the million gallon sludge storage tank until they can be land applied as a fertilizer on farm land. The unit processes are further described below.
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