The National Pollution Discharge Elimination System (NPDES) permit for the Platte Generating Station requires either elimination of the pollutants in the bottom ash transport water, or elimination of the discharge of bottom ash transport water to the settling pond, or any impoundment by December 31, 2023. We are providing engineering services to the City of Grand Island, Nebraska to identify, evaluate and implement options to meet this permit condition and to eliminate the discharge of bottom ash transport water to settling ponds that discharge to the Platte River.
The City determined that converting the bottom ash handling system from the current wet ash transport system to a dry ash handling system is not economically viable. Foth is focusing on alternatives to reduce and allow reuse of the bottom ash transport water, which would require water quality similar to the groundwater. The City wishes to have the system improvements completed and operating by December 2022.
Our tasks are to:
Our team will advance the conceptual design basis based on the alternative selected. The updated conceptual design will include a process flow diagram, heat and mass balances, preliminary equipment schedules and sizing criteria, preliminary equipment layout drawings, budgetary estimates, opinion of probable construction cost, and a preliminary schedule for implementing the proposed improvements.