Merchant Sludge Facility Optimization Using Vertical Shaftless Screw Conveyors
Abstract:Vertical shaftless screw technology is being installed at the Naugatuck, Connecticut incineration facility as an alternative to pumping dewatered sludge. While shaftless screw conveyors are frequently used in horizontal applications, there are relatively few U.S. installations of vertical sludge conveyance with shaftless screws at distances greater than thirty feet. Many municipal wastewater treatment plants in southern New England dispose of sludge through contract hauling to a regional incineration facility. These facilities are receiving increased volumes of dewatered sludge due to rising transportation costs. The Naugatuck incineration facility is contract operated by Veolia Water and accepts thickened and dewatered sludge from wastewater plants throughout Connecticut. The dewatered sludge receiving bin is emptied by two progressing cavity pumps, which transfer the sludge to the storage silo, a vertical distance of over eighty feet. Because these pumps have been prone to mechanical failures a review of the available alternative conveying technologies was performed. An innovative vertical shaftless screw system was selected to replace the pumps. The new conveyance system will be installed in August 2007 and includes twenty-five shaftless screw conveyors with a capacity of 100 cubic yards per hour. This paper will includes past experience with this technology, details of the retrofit design, a review of the accelerated construction process, required to minimize facility down time and revenue loss, and a report on the functionality of the equipment. A brief review of the sludge management trends in southern New England will also be provided, focusing on the move towards contract hauling and the impacts on local municipalities.
Document Type: Research Article
Publication date: January 1, 2008
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