Dewatering Case Study: Rotary Fan Press Versus Screw Press
Authors:
- Kyle C. Novak, P.E., Steven C. Reese, P.E., and William James Gellner, II, P.E. - Hazen and Sawyer
Solids dewatering focuses on liquid reduction while providing safe handling and disposal of residuals at a wastewater treatment facility. Selection of a dewatering technology requires systematic analysis of a wide array of options including treatment processes, residual characteristics, and other site-specific variables. In addition, dewatering systems typically require a relatively large initial capital investment and a substantial share of a municipality’s annual budget for operation and maintenance. Under the constraints of rising energy and disposal costs which increase with residuals management, municipalities are looking at new and different dewatering technologies.
A municipality can better comprehend the value of dewatering technologies when compared on a long-term net present worth and including non-cost factors. These unique tools provide a means to quantify the true cost for a facility in selecting the appropriate technology to dewater their residuals.
This paper focuses on comparison of two dewatering technologies from a single case study; rotary fan press versus screw press. The rotary fan press and screw press technologies were piloted against one another at a municipal wastewater plant. The results of the piloting and comparison of cost and non-cost factors are discussed.
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