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DOI : 10.17640/KSWST.2014.22.6.23 ,    Vol.22, No.6, 23 ~ 31, 2014
Title
Ammonium and Nitrate Removal Characteristics of Natural Zeolite(Clinoptilolite) in the Artificial Seawater
김이태 I Tae Kim
Abstract
This study is to evaluate the efficiency of simultaneous removal of ammonium and nitrate by the natural zeolite clinoptilolite in seawater. The natural zeolite clinopilolite is a selective exchange for ammonium cation. First, the different of ammonium exchange of natural zeolite in water and seawater was investigated. The result indicated that the ammonium uptake of the zeolite in sea water is less than water obviously, becase of the competitive exchange of Na+, Mg2+, K+, Ca2+ in seawater. When using only pure natural zeolite, the removal rate of ammonium and nitrate were 52.3% and 7.2%. However, the removal rate of the ammonium and nitrate were 71.5 % and 38.9% by using zeolite inoculated with nitrification and denitrification bacteria in marine aquarium reaction vessel inoculated with microorganisms. And the biologically regenerated zeolite was recovered to 87.7% of ammonium zeolite adsorption capacity of the original, even thought the biofilm was fully developed on the zeolite surface, ammonium removal and the biological regeneration of the zeolite occurred constantly. This result could be used as foundational data to design of ammonium and nitrate simultaneous removal systen in seawater.
Key Words
Ammonium and nitrate removal, Seawater treatment, Natural zeolite, Clinoptilolite
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