SELECTING THE MOST COST-EFFECTIVE HIGH-RATE CSO TREATMENT TECHNOLOGY
Considering the high cost of off-line storage, the City of St. Catharines and the Regional Municipality of Niagara decided to evaluate high-rate treatment (HRT) technologies to treat some of their mid- to small-volume combined sewer overflows (CSOs). The scope of the project was to evaluate a wide range of HRT technologies for feasibility in treating the City's CSOs. An assessment of the available storage and high-rate treatment technologies was undertaken and certain technologies were selected for conceptual design and costing. Four sites were selected for monitoring and the development of conceptual HRT designs. Conceptual level sizing of the selected technologies was undertaken using a dynamic simulation model, implemented in the GPS-X™ simulator, to meet regulatory treatment requirements. Costing of the conceptual designs was undertaken at each site and recommendations were made as to the most appropriate technology. A staged implementation plan was recommended for the sites studied or other sites in the City. In general, a polymer-aided retention treatment basin (RTB) option was determined to be the most appropriate technology at the four sites considering footprint, costs, and labor requirements.
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Document Type: Research Article
Publication date: 2005-01-01
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