During a product installation demonstration for the rehabilitation of some aging brick manholes and a concrete lift station, Mack McDonald saw what he thought might be the solution to save a deteriorating clarifier and reduce the cost of maintaining it.
The clarifier was one of two older 70-foot-diameter units at the Lancaster (S.C.) Wastewater Treatment Plant, says McDonald, public utility director. Put into service in the early 1950s, the treatment plant had seen many upgrades and changes. Today the 2.2 mgd (average) plant serves 6,000 customers in the city, 8,000 customers in the surrounding county, and three large industrial facilities.
The clarifiers
