Abstract
The columnar denitrification process has emerged as a proved and accepted method for removing nitrates from wastewaters. This paper discusses operating experiences while removing nitrogen in effluent polishing filters at an activated sludge plant in Western Pennsylvania. The effect of temperature on removal efficiency and the interrelationship of the denitrification filters to other treatment units is discussed. Operating procedures have been developed to accommodate nitrogen gas buildup in the Denite filters and operating data is included to illustrate simultaneous removal of nitrates and suspended solids. Ample time will be provided to discuss the operation of this type of plant.
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