- Southwest Wastewater Treatment Plant Improvements
The City of Junction City, Kan., retained Burns & McDonnell for the design of the Southwest Wastewater Treatment Plant (SWTP) improvements previously identified by Burns & McDonnell in a Process and Operational Evaluation Report. The SWTP was designed primarily to treat wastewater from the ConAgra Foods meat processing and packing facility located in Junction City. The 1 million gallon per day (MGD) wastewater flow from ConAgra represented about 70 percent of the flow treated at the SWTP. The current design capacity of the plant is 2.5 MGD. The SWTP improvements were intended to optimize the overall treatment process. In addition, the ultraviolet (UV) disinfection process was not achieving the required compliance limits for fecal coliforms.
The SWTP includes two pretreatment trains — domestic and industrial — and one combined treatment train. The domestic pretreatment train includes a pump station and a climbing screen. The original industrial pretreatment train includes a pump station with neutralization, a neutralization tank, a rotary fine screen and two DAF units. The original combined treatment includes a selector basin, two oxidation ditches, two final clarifiers and UV disinfection. The biosolids handling includes two sludge stabilization tanks (use of lime for stabilization) and one sludge storage tank.
Burns & McDonnell was retained to provide complete design and bidding services for the modifications. In addition, engineering services during construction and on-site resident services were provided.
- High-strength wastewater
- Hydraulic analysis
- Dissolved air flotation (DAF)
- Chemical feed systems
- Sludge handling
The design improvements for the domestic pretreatment train included a new climbing screen. The improvements for the rest of the facility included:
- A primary rotary screen and screenings handling
- A neutralization tank
- A pump station
- A screen building
- A 250,000-gallon equalization tank
- Recirculation system for the DAF units
- Chlorination/dechlorination basins (chlorination with sodium hypochlorite and dechlorination with sodium bisulfite)
- A chemical storage building
- Electrical and automation control upgrades
- An emergency generator
- A storage/maintenance building
- Fencing and road improvements
- Two concrete sludge stabilization tank to replace the existing bolted steel tanks
- One concrete sludge storage tank to replace the existing bolted steel tank