Clarifiers Maximize Geotextile Tube Efficiency

摘要

Dewatering in dredged material management is on the rise. Driving the trend are issues such as high contaminated sediment transportation costs and low space availability at many confined disposal facilities. Clarifiers, or what the industry terms as "thickeners," are often the chosen dewatering treatment tools prior to final dewatering. Custom-built clarifiers, manufactured by Milwaukee-based Clearwater Industries, were installed by dredging contractor J.F. Brennan Co., Inc., on the major PCB-contaminated sediment cleanup project at the head of the Lower Fox River in Northeast Wisconsin - a remediation operation that began in June 2004 and is still underway. The clarifiers, working in conjunction with a trommel screen, were put into operation in 2006 to achieve an optimum solids capture ratio, improve geotextile tube efficiency, and to attain the throughput required to meet a capacity goal of up to 150,000 cubic yards.