DEMONSTRATION TESTING OF DENITRIFICATION EFFLUENT FILTERS TO ACHIEVE LIMIT OF TECHNOLOGY FOR TOTAL NITROGEN AND PHOSPHORUS
Many facilities are being required to meet effluent limits noted as “limit of technology” in an attempt to reduce the nutrient discharge to our nation's waterways. While many facilities have achieved these technology limits for one of the major nutrients (phosphorus or nitrogen), achieving these limit of technology limits for nitrogen and phosphorus in effluent denitrification filters has not been widely reported. No vendors of effluent filters could provide information on the application of denitrification filters on waters with very low soluble phosphorus. Demonstration testing was conducted of two different denitrification effluent filter technologies to evaluate the ability to achieve low effluent total phosphorus, total nitrogen and total suspended solids concentrations, and operating strategies to comply with ever more stringent effluent quality. The concern was whether low soluble phosphorus influent concentrations (< 0.1 mg/l) would affect denitrification performance via inhibited growth of denitrifying microorganisms on the filter media. Also, there was a site specific concern with varying nitrate loadings onto the effluent filter due to planned changes in the activated sludge BNR process during wet weather conditions. This paper will present the results of this demonstration testing and subsequent design criteria.
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Document Type: Research Article
Publication date: 2005-01-01
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