Project Highlight

Blue River Wastewater Treatment Plant — Overland Park, Kansas

PROJECT 1060  Grimm Construction, a wholly-owned subsidiary of Garney Holding Company, was selected as the Construction Manager at Risk for a $30 Million upgrade to the Blue River Wastewater Treatment Plant in Overland Park, Kansas. The project was necessary to meet Johnson County Wastewater growth needs, new regulatory requirements, and facility rehabilitation needs.

For the expansion, the design maximum month and wet weather peak flow rates will be 10.5 MGD and 33 MGD, respectively. The design annual average flow of 10.5 MGD is the result of the existing aeration basin being modified and re-rated at 3.5 MGD and the addition of two 3.5 MGD trains. The design flows allow for maximum use of the existing facilities. The upgraded and the new basins will have Biological Nutrient Removal (BNR) capabilities.

A description of the expansion and improvements to the plant are as follows:

• Modifications to the dry weather and wet weather influent pumps in the influent pumping station. This includes the removal and replacement of two dry-weather pumps and all wet-weather pumps with larger capacity units. Electrical modifications including a new electrical room for the pump controls will also be added.
• Addition of a second grit chamber with associated grit removal equipment, classifier, and concentrator.
• Modification of the existing grit chamber flow splitter to provide adequate flow split to the new treatment trains.
• Modification of the existing aeration basin and addition of pre-anoxic, anaerobic, and anoxic zones on the north end to allow BNR treatment.
• Addition of two new BNR basins with pre-anoxic, anaerobic, anoxic, anoxic cells.
• Expansion of the existing blower building.
• Addition of two return activated sludge (RAS) / waste activated sludge (WAS) pumping stations.
• Expansion of the existing DAF building and the addition of a second DAF tank with its associated equipment.
• Conversion of the existing equalization tank to a thickened waste activated sludge (TWAS) storage tank.
• Addition of three 105-foot diameter clarifiers.
• Addition of a 24-mgd ultraviolet (UV) disinfection facility.
• Addition of two cascade-type re-aeration basins.
• Addition of an activated carbon odor control system to treat airflows from the influent pump station, new DAF tank, and the modified equalization tank (TWAS storage tank).
• Modifications to the existing excess flow lagoon and the addition of a second lagoon.
• Modifications to the existing sodium hypochlorite and sodium bisulfate chemical feed systems for the lagoons.
• Addition of a new outdoor ferrous chloride storage tank.
• Modifications to the existing operations building.
• Addition of a maintenance building.
• Replacement of the electrical distribution system to include redundant feeds to critical equipment