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The City of Niagara Falls, New York wastewater treatment facility has been using granular activated carbon adsorption/filtration to achieve secondary treatment for over fifteen years. While the system functions principally as planned, modifications to backwashing procedures, onsite carbon regeneration and odor control/corrosion control systems have improved operability and decreased expenses. The current odor control strategy was developed after trial applications of various chemical oxidizers and agents at various locations in the treatment process. The filters are now allowed to operate in an anaerobic state, while byproducts and chemically reduced compounds in the effluent are oxidized prior to disinfection. Scheduled media regeneration and backwash water chlorination helps keep anaerobic activity under reasonable control.

One recent experiment examined the effect of operating filters with reduced carbon inventory and increased carbon quality upon pollutant removal and odor production. After a period of acclimation, odor production from the experimental filters became equivalent to the control filter, while specific pollutant removals were the same or poorer than that of the control filter. Reduced odor generation, reduced costs, and better system control would result from greater consistency in maintaining a strong chlorine residual in the backwash water, thereby controlling anaerobic growths in the filter underdrain system, rather than by reducing or replacing the carbon media.
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Document Type: Research Article

Publication date: 2002-01-01

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