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.

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ASTRASAND™ Continuous Backwash Filter