Tertiary nitrifying trickling filters (NTFs) at the Littleton/Englewood wastewater treatment plant provide for nitrification to meet seasonally varying effluent requirements for ammonia nitrogen. Operation of the full-scale facilities during the past two years demonstrates highly efficient oxidation of ammonia and the effectiveness of biofilm control strategies. A decline in nitrification performance caused by predators was successfully corrected by the use of a special alkaline backwash feature which controlled the level of larval development within the NTFs.
Maximizing trickling filter nitrification rates through biofilm control: research review and full scale application
Denny S. Parker, Tom Jacobs, Erich Bower, Dennis W. Stowe, Greg Farmer; Maximizing trickling filter nitrification rates through biofilm control: research review and full scale application. Water Sci Technol 1 July 1997; 36 (1): 255–262. doi: https://doi.org/10.2166/wst.1997.0060
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