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Environmental Letters Volume 4, 1973 - Issue 1
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Original Articles

Enhanced Nitrification by Addition of Clinoptilolite to Tertiary Activated Sludge Units

Ronald C. Sims Department of Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina, 27514, USA
&
Linda W. Little Department of Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina, 27514, USA
Pages 27-34 | Received 19 Jul 1972, Accepted 31 Jul 1972, Published online: 02 Sep 2009
 
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Abstract

A new technique for improving the efficiency of the nitrification process in the treatment of wastewater utilizes the surface sorption property of a natural zeolite, Hector Clinoptilolite. The process utilizes the zeolite as a solid-phase in an activated sludge unit. The zeolite selectively sorbs NH4 + ions from wastewater and therefore provides an ideal surface for the attachment of nitrifying bacteria which oxidize NH4 + to NO3 -. The removal of the adsorbed NH4 + from the zeolite by nitrifying bacteria allows regeneration of the zeolite surface and thus enables the same zeolite to be used repeatedly.

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