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The Bismarck WWTP was designed to treat a flow of 7.5 MGD containing up to 16,300 lb BOD/day and 12,500 lb TSS/day.
The treatment system consists of fine screens, vortex grit removal, primary and final clarifiers, trickling filters, chlorination/dechlorination and anaerobic sludge digestion. A flow equalization tank is also available. Sludge is land applied.
SEH completed a “Master Plan Study” that included five technical memoranda that reviewed specific aspects of the operation in detail. Needed improvements were prioritized into six phases that will be undertaken over the next several years.
Building consensus with plant staff was accomplished through several planning meetings with the entire group, and through an exercise that allowed staff teams to select and rank improvements.
SEH completed the design of three 1.2 million gallon sludge storage tanks (Phase 1) on a fast-track basis so the City could have one on-line by the end of 2003 to meet a regulatory schedule. These were facilities recommended in the Master Plan Study.
SEH also completed the design for an expansion and upgrade of various components at the plant. The $18 million project consists of a new 18,000 SF pretreatment building with drum screens, high performance grit removal system and septage receiving station. The upgrade also includes a new primary clarifier and gallery and refurbishing five existing clarifiers and their related sludge pumping and piping facilities. Digester gas and sludge piping renovations are included as is a new plant-wide SCADA system and auxiliary power generator.