TWO STAGE PUMPING SYSTEM SOLVES WASTEWATER DILEMMA
Abstract:The Town of Ridgefield, Connecticut was facing a wastewater dilemma. A new wastewater disposal system was needed to allow construction of a new middle school and an expansion of the existing high school. To expand or replace the existing on-site disposal system was prohibitively costly due to the site conditions of high groundwater, wetlands, and rock. To resolve the dilemma, the Town investigated an alternative approach to connect to the existing wastewater collection system, located approximately four miles away, using a two-stage pumping system.
The two-stage system has been constructed and is in operation. The successful construction and continued operation of the pump station indicate that two-stage pumping is an effective option for conveyance of wastewater from a remote location. In this case, the implementation of this approach yielded a savings to the town of approximately $3 million in capital cost over the proposed on-site treatment solution. This paper examines the major planning considerations involved in the initial and final design of the pump station and force main, describes some of the hydraulic design challenges and the selected solutions, and reviews several of the construction considerations that addressed unique aspects of this project. With the current trend in population growth and school construction projects in the suburban areas, where the only available sites for new school facilities are often remote from the existing municipal wastewater collection and treatment systems, other communities may be facing challenges similar to those encountered in this project.
Document Type: Research Article
Publication date: 2005-01-01
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