Operations, Maintenance & Cost Comparisons of Three Dewatering Devicesby Nadim A. Shamat, Metropolitan Waste Control, Commission, St. Paul, MN, USA,
George B. Vania, Metropolitan Waste Control, Commission, St. Paul, MN, USA,
Abstract: The Metropolitan Waste Control Commission's Wastewater Treatment Plant in Minneapolis/St. Paul has demonstrated that two new innovative sludge dewatering pocesses, namely, vari-nip twin roll presses and plate and frame diaphragm presses, can successfully and reliably, dewater primary, secondary and secondary/primary heat treated sludges. The dewatered cake is autogenously incinerated. Substantial heat recovery is being achieved through utilization of waste heat recovery boilers. The objective of this paper is to describe the major startup problems encountered with these two devices, to illustrate the capabilities and limitations of these two processes, and to compare their cost of operation relative to vacuum filters.
Subject Headings: Sludge | Wastewater treatment plants | Dewatering | Plates | Frames | Diaphragms (structural) | Heat treatment | Energy recovery
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