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RETROFITTING CONTROL FACILITIES FOR WET WEATHER FLOW TREATMENT
Citation:
Moffa, P. E., H. M. Goebel, D. P. Davis, J. J. LaGorga, AND T P. O'Connor*. RETROFITTING CONTROL FACILITIES FOR WET WEATHER FLOW TREATMENT. Presented at 2000 Joint Conference on Water Resources Engineering & Water Resources Planning & Management of the American Society of Civil Engineers-Urban Water Resources Research Council sponsored session, Minneapolis, MN, July 30-August 2, 2000.
Description:
Available technologies were evaluated to demonstrate the technical feasibility and cost-effectiveness of retrofitting existing facilities to handle wet-weather flow. Cost/benefit relationships were also compared to construction of new conventional control and treatment facilities. Desktop analyses were performed for 13 separate retrofit examples for: 1) converting or retrofitting primary settling tanks with dissolved air flotation and lamellae and/or microsand-enhanced plate or tube settling units, 2) retrofitting existing wet-weather flow storage tanks to provide enhanced settling/treatment and post-storm solids removal, 3) converting dry ponds for enhanced treatment, 4) retrofitting wet-weather flow storage tanks for dry-weather flow augmentation, 5) sanitary sewer overflow control using storage, 6) retrofitting for industrial wastewater control in a combined sewer system, and 7) bringing outdated/abandoned treatment plants back online as wet-weather flow treatment facilities.
This analysis demonstrated that retrofitting existing wet-weather flow facilities can be technically feasible in most cases and may be more cost-effective than construction of new conventional control and treatment facilities. The feasibility and cost effectiveness of retrofitting was found to be a function of site-specific conditions and treatment requirements. Retrofitting processes will enable communities to meet EPA's National CSO Policy and stormwater permitting program requirements.