The process starts by treating extracted groundwater in a series of tank vessels. Once the metals are removed, the treated water is reinjected via wells back into the aquifer. This innovative technology is the first of its kind in the nation to be used at coal ash basins and reduces metal concentration by up to 99%.
The system is designed to capture groundwater at the basin perimeter and removes arsenic, molybdenum, boron and other metals to meet the permit issued by the Missouri Department of Natural Resources (MDNR). The permit also requires that the treated water meets federal Safe Drinking Water Standards (SDWS). Once returned, the treated water has lower metal values than naturally occurring levels in the area. The below results show how effective the treatment is in removing metals.
Ameren Missouri and its consultants worked for several years on treatability studies to determine the most effective method to meet CCR compliance at Rush Island. Lab studies using soil and water from the site allowed Lourerio to formulate site specific methods that removed contaminants to meet regulatory requirements. Groundwater treatment systems are in place at the Sioux Energy Center and the former Rush Island facility and are being evaluated for the Labadie Energy Center.
Monthly reports are submitted to MDNR, ensuring the system meets and maintains the permit standards.
