Controlled Discharge Lagoon Conversion
This CDBG funded project consisted of converting one set of lagoons into flow equalization basins and installing a lift station for pumping sewage to the second facility. The City of Colesburg had two separate wastewater treatment facilities of which each had controlled discharge lagoons. The second facility was converted into a continuous discharge lagoon followed by a Submerged Attached Growth Reactor (SAGR) and UV disinfection. Through the coordination of flow meters and system controls, this system was designed with the capability of storing peak flows within the flow equalization basin, which helped minimize wastewater treatment plant improvements. Expansion of the wastewater treatment facilities was limited to the existing property boundaries, so a compact solution was paramount. Contractor delays forced start-up of the SAGR process in the fall, the least ideal time of the year for establishing nitrifiers. However, coordinated efforts with the city and contractor resulted in a start-up with zero permit violations with zero permit violations to date.