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RETROFITTING CONTROL FACILITIES FOR WET-WEATHER FLOW CONTROL
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 CONTROL. Presented at New York Water Environment Federation 73rd Annual Meeting, New York, NY, 2/4-7/2001.
Description:
Available technologies were evaluated to demonstrate the feasibility and cost effectiveness of retrofitting existing facilities to handle wet-weather flow (WWF). Cost/benefit relationships were compared to construction of new conventional control and treatment facilities. Desktop analyses were performed for 13 separate retrofit examples, including 1) converting or retrofitting primary settling tanks with lamellae and/or microsand-enhanced plate or tube settling units, 2) retrofitting existing WWF storage tanks to provide enhanced settling/treatment and post-storm solids removal, 3) converting dry ponds to wet ponds for enhanced treatment, 4) retrofitting WWF 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control using storage, 6) retrofitting for industrial wastewater control in a combined sewer system, and 7) bringing outdated/abandoned treatment plants back online as WWF treatment facilities. This analysis demonstrated that retrofitting existing WWF facilities can be technically feasible in most cases and may be more cost effective than the 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 better enable communities to meet the US EPA's National Combined Sewer Overflow Policy and stormwater permitting program requirements.