Abstract: This paper provided an overview on the methodologies for zeolite synthesis from fly ash (FA),and a detailed description of conventional alkaline conversion processes,with special emphasis on the experimental conditions to obtain different zeolite types. Zeolitic products could be obtained from FA by direct conversion and two-step conversion. A review of potential applications of different zeolitic products for waste water was also given. The examination of the data presented by different authors reveals that one of the main potential application of this material is the uptake of heavy metal ions from polluted waste waters. The adsorption capacity was different according to zeolites type. A new direction with zeolite synthesized from FA is gived.

Key words: fly ash%zeolite%absorb%waste water%heavy metal ions