As effluent discharge permit limits become more stringent, utilities are constantly searching for efficient and costeffective methods to meet these tighter restrictions. One effluent parameter that is drawing increased scrutiny is nitrogen, usually measured as either nitrate-nitrogen (NO3-N) or total nitrogen (TN).  Many different technological strategies have been developed that attempt to address this growing concern. This paper illustrates the refinement of an established wastewater process to accomplish biological nitrogen removal, describing the design, pilot testing and start-up of a full scale, continuous backwash denitrifying filter which utilizes an innovative process control system to regulate the sand circulation rate to maintain an optimum biomass concentration within the media.

Download the complete paper (as presented at the NCAWWA/WEA Annual Conference)

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Enhanced Nutrient Removal 

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