Technology for Removing Ammonia Nitrogen by Modified Natural Clinoptilolite
The significant impact of ammonia nitrogen pollution on the environment and ecosystem has al-ways made the removal of ammonia nitrogen pollution a focus of attention in the field of water treatment. In order to effectively remove ammonia nitrogen pollution from sewage,acid,alkali,salt,and heat treatment methods are used to modify Hailin clinoptilolite,and the morphology analysis and adsorption capacity of the clinoptilolite are determined.The experimental results show that all four modification treatments would affect the exchage performance of clinoptilolite,among which salt modification has the best effect and is easier to operate in practice.The modified clinoptilolite still conforms to the Lagmuir type equilibri-um relationship.According to the ion exchange isotherms of the three salts of sodium,potassium,and calci-um,it can be seen that the NH4+exchange isotherms of all three d-type curves,and the selective exchange ability of the three is sodium zeolite>calcium zeolite>potassium zeolite.Clinoptilolite can be effectively regenerated,and the modified clinoptilolite after salt treatment can more effectively adsorb ammonia nitro-gen in sewage.
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