Abstract
This chapter discusses the application of natural zeolites to purify polluted river water. The ability of zeolites to purify wastewater is compared with that of regular river gravel, which has no ion exchange ability. The results show that calcium (Ca)-rich mordenite is superior to normal river gravel to purify waste river water polluted by ammonium ions. The decrease of ammonium ions in polluted water is a result not only of ion exchange with calcium ions in zeolite, but also of microbiological oxidation on the surface of zeolite. The ability of natural zeolites to oxidize ammonium ions into nitrate ions is a function of the zeolite contents of minerals and the type of zeolite species.
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