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The paper presents the possibilities of using synthetic zeolites in environmental protection and engineering. As a result of the synthesis reaction of fly ash, the following types of zeolites were obtained: Na-X, Na-P1, sodalite, and two mixtures of zeolites composed of Na-P1/Na-X/Linde-A and Na-P1/Linde-A. Obtained zeolites were tested on the removal of ammonium ions from water, radionuclides (226Ra and 228Ra) from mine water, zinc ions from washing baths, CO2 from exhaust gases, and oil refining. In the case of ammonium ion removal, the uptake of these ions from aqueous solutions increases with the increase in the initial concentration of NH4+ in the tested artificial solution. The tests of radionuclides removal have shown high efficiency that reached 98%. The analysis of purification washing baths results indicate Zn2+ high removal efficiency of the tested zeolite. Zeolites are a bit less effective at removing CO2. However, they were very good materials in oil refining where the obtained results are slightly better than for the adsorbents used commercially for this purpose. The results showed that, in most cases, the zeolites tested remove the aforementioned contaminants very effectively, and are a competing material for various kinds of commercially available adsorbents used for the described