The City of Salina Kansas owns and operates the Salina Wastewater Treatment Plant (WWTP) located at 596 N. Marymount Road. The WWTP has a permitted design flow of 7.25 Million Gallons per Day (MGD) with a current average daily flow of 3.55 MGD. The treated effluent is discharged to the Smoky Hill River. The WWTP was originally construction in 1926 to provide liquid and solids treatment of influent flows. The WWTP has gone through several upgrades to improve operations and meet effluent requirements. An overview of these improvements is as follows:
|1993||The treatment plant consisted of 2 primary clarifies, 2 high-rate tickling filters, 2 intermediate clarifiers, and 1 anaerobic digester, which is now used as the Second Anaerobic Digester|
|1993||Liquid process improvements consisted of adding 2 primary clarifiers, 2 high rate tickling filter, and 2 intermediate clarifies. Solids process improvements consisted of adding 3 new primary anaerobic digesters.|
|1993||Liquid process improvements consisted of adding a new headworks building with 2 fine screens and 2 aerated grit basins, 3 new aeration basins, 3 final clarifiers, UV Disinfection, and post aeration. Solids process improvements consisted of adding 1 new primary anaerobic digester.|
|1994||Solids process improvements consisted of adding a belt filter press dewatering building.|
|2013||The high rate trickling filters and intermediate clarifiers were taken out of service and are no longer in use|
Many plant components have reached the end of their useful life and require rehabilitation or replacement. The City is also facing forthcoming requirements for nutrient removal to meet effluent limits for total nitrogen (TN) and total phosphorus (TP) per the current National Pollutant Discharge Elimination System (NPDES) permit effective January 1, 2020 through December 31, 2024.
A Capital Improvements Plan (CIP) to meet the above objectives was prepared as follows:
- Phase I of the CIP consists of a project to rehabilitate or replace critical infrastructure at the WWTP to keep the plant operational generally intended to be for facilities utilized in the current and future treatment schemes.
- Phase II of the CIP will address the implementation of upcoming TN and TP effluent limits and will address only a portion of the plant capacity (6.4 MGD).
- Future Phase III of the CIP will address the remaining capacity of the plant.
Estimated Project Costs
|Pre-construction Engineering Services|
Complete Engineering and Construction Costs
HDR Owner's Representative Services
|$41,663,672||Estimated Total Project Cost for WWTP Improvements|
Source of funding
KDHE Kansas Water Pollution Control Revolving Fund in the amount of $41,500,000 at an interest rate of 1.30%.
Estimated Project Schedule
|February 16, 2023||Notice to Proceed with Construction|
|July 11, 2024||Construction complete for Phosphorus Removal|
|June 11, 2025||Construction complete for Nitrogen Removal|
|December 1, 2025||Substantial Completion of Construction|
|February 4, 2026||Final Completion of Construction|