By DEQ Grants and Loans Program

Upgrades to the city of Nampa wastewater treatment plant include a biological system for phosphorus removal, saving an equivalent of $7 million over a 20-year period as compared to any other alternative evaluated. The process so efficiently reduces the need for chemical addition and so effectively minimizes the amount of chemical sludge to be disposed, that these reductions alone result in a simple payback period of 2.5 years for the upgrades. In addition, new energy efficient pumps result in energy savings equal to the annual lighting needs of 550 residences.

The project was made possible with a low-interest loan from the Idaho Department of Environmental Quality State Revolving Fund (SRF). The SRF loan process emphasizes reductions to operations and maintenance costs.

Investigation required by the SRF Green Project Reserve Program revealed cost-effective 'green' opportunities to upgrade the system. Substantial cost savings will rapidly offset the initial cost difference of the 'green' components.

The biological process that has been implemented significantly reduces the need for chemical addition for phosphorus removal and greatly decreases the amount of chemical sludge to be disposed.

City consultants also recommended installing new premium energy efficient turbine pumps equipped with Variable Frequency Drives, resulting in annual savings to the city of $33,160 and 663,200kW-hr.

To learn more about grants and loans available to wastewater and drinking water systems, visit our Grants and Loans webpage.