Abstract
The removal of Cr(VI) from aqueous solution by batch adsorption experiments using fly ash (FA) and composite filter material made of fly ash (FACFM) as adsorbents were investigated. The influence of pH, contact time on the selectivity and sensitivity of the removal process were investigated. The effect factors such as adsorbent dosage level, initial Cr(VI) concentration and temperature were studied throughorthogonal experiment to investigate their degree of influence on the Cr(VI) adsorption process. Results show that FA and FACFM can be considered as efficient sorbents for the removal of Cr(VI) from aqueous solutions. It was also shown that increase in the adsorbent dosage level led to increase in Cr(VI) adsorption due to the increased number of adsorption sites, the adsorption process was highly pH dependent and the optimum pH was less than 3. Both adsorption rate and the removal ratio of FA were larger than that of FACFM because of its larger contact area and its powdery form, but concerning the intensity and ease of separation from aqueous solution, FACFM was more practical and can be used for wastewater treatment. Key words: Cr (VI), fly ash (FA), fly ash composite filter material (FACFM), adsorption, orthogonal experiment.
Highlights
Disposal of effluents, containing heavy metals produced by processing industries, is a challenging task for environmental engineers due to their persistent and nondegradable nature
Results show that fly ash (FA) and fly ash composite filter material (FACFM) can be considered as efficient sorbents for the removal of Cr(VI) from aqueous solutions
The results showed that the removal ratio of FA was better than that of FACFM
Summary
Disposal of effluents, containing heavy metals produced by processing industries, is a challenging task for environmental engineers due to their persistent and nondegradable nature. Chromium is of great concern due to the tendency of it been accumulated on vital organs of humans and animals, causing several health problems (Nriagu and Nieboer, 1988; Department of Health and Human Services, 2000). It is used in a variety of industrial applications; Sources of chromium waste leading to water pollution includes chrome plating, stainless steel fabrication, the manufacture of dyes and pigments, leather tanning, etc. The two-oxidation states of chromium have different chemical, biological and environmental characteristics (WHO, 1988). The tolerance limit of Cr(VI) for discharge into inland surface waters is 0.5 mg/l and 0.05 mg/l in potable water in China
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