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천연 제올라이트를 이용한 고농도의 칼슘이온 제거 : 공존양이온 및 재생의 영향 Effects of Coexisting Cations and Regeneration
안봉규,오재일 대한상하수도학회 2003 상하수도학회지 Vol.17 No.3
Calcium exchange by natural zeolite was investigated in relation to the coexistence of other cation (Na^+ and/or K^+). Although some zeolite (e.g., clinoptilolite) have a good affinity and selectivity for calcium ions, other cations in the solution have a negative impact on the calcium exchange. The exchange capacity decreased significantly according to the increase of Na^+ and/or K^+ concentrations, however the decreasing extent was not similar between two different ion species. It was estimated that K^+ possessed more affinity for the zeolites, resulting to obtain more exchange sites of zeolite in the competition. Also, sodium chloride was tested as the regeneration brine, and found that 3.8% of NaCl showed the optimal concentration for desorbing calcium ions.