Decatur’s Water Treatment Revolution

Traditionally used in smaller facilities, ClariCone technology integrates primary and secondary treatment within a single unit. Its application in Decatur’s larger-capacity plant marks a notable advancement in water treatment design, optimizing both space and performance. 

Built in 1988, Decatur’s lime softening water treatment plant had a capacity of 36 MGD and relied on a two-stage clarification process using 100-foot square primary clarifiers and 120-foot square secondary clarifiers. Over time, the plant’s two parallel 18 MGD treatment trains had aged to the point of needing extensive rehabilitation, including upgrades to scraper mechanisms, drives, motors, and painting. 

In 2015, CMT conducted a feasibility study to evaluate options for rehabilitating the existing clarifiers or transitioning to SCCs. The study identified SCC conversion as the most efficient and cost-effective solution. As part of the project, two 71-foot, 6-inch diameter single-stage SCCs replaced the outdated clarifiers

This conversion delivered measurable benefits, increasing the plant’s total capacity from 36 to 38 MGD while reducing maintenance demands by approximately 600 man-hours annually. The new system also improved energy efficiency and sustainability by consolidating treatment processes and reducing reliance on electrical components. 

The Decatur Clarifier Conversion project exemplifies how thoughtful design and modern technology can extend the lifespan and functionality of critical infrastructure in high-capacity water treatment facilities.