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《Journal of Safety and Environment》 2004-02
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Research on removing ammonia-nitrogen from water by activated zeolite

JIANG Zhe, NING Ping, PU Hong-ping, DENG Chun-ling, HUANG Xiao-feng (Department of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China)  
The present paper aims to introduce the authors' new ways on how to activate the natural zeolite and treat inorganic acid, inorganic salt, rare earth and the similar inorganic elements. First of all, the authors of the paper have given an account of the principles of the various activating methods. Then, comparing the testing results of ammonia nitrogen removal efficiency (or adsorption capacity), the paper presents the optimal method and the effect on the carrier caused by the chemical treatment, should be examined by means of X-ray diffraction. And finally, the kinetics of NH_4~+ adsorption by activated zeolites and the refreshing experiments were investigated. The results of the present research show that all the above methods help to enhance the capacity of removing Ammonia-nitrogen from wastewater to a great extent. However, among these methods, the best one is the treatment with inorganic salt. The optimal process for manufacturing it should be based on the following conditions: the zeolite carrier should be soaked for 2 h in the 0.8 mol/L Na~+ solution under 70~75 ℃. The total solid/liquor ratio is equal to 1∶50. Then, the carrier can be dried at 100 ℃ for 1h. In addition, it is also proved that the NH_4~+ adsorption process is well described by modified Freundlich. As compared with the chemical coagulation and biological method, the absorption method is simpler, more efficient and profitable. Hence, it can be used as a new approach to further treatment of urban sewage waste.
【Fund】: 云南省自然科学基金项目 (编号 :2 0 0 0 B0 0 2 3M)
【CateGory Index】: X703
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