Abstract
The present work studies the possibility of using two solid industrial wastes TERMOPAIPA'S fly ash and ECOPETROUS FCC catalyzer waste in removing and recovering chrome from tanneries’ liquid effluent. Fly ash was subjected to two alkaline hydrothermal treatments for obtaining zeolytic structures having better properties; waste catalyser was calcined for eliminating surface coke. Solids were characterized following treatment including DRX, BET area and CEC. A colorimetric method was standardized for determining chrome in solution; a response surface experimental design was implemented for finding optimum removal conditions. The most efficient adsorbent was fly ash treated with increased NaOH concentration; optimum conditions for removing chrome were: 58 minutes at 36°C, 5.9 pH and 31% w/v solid removal. When reused, it was found that the two batches of treated fly ash became saturated following 6 cycles of use, whilst original ash and FCC catalyzer became saturated the second time they were used. Four de-absorbent agents were used for recovering chrome from adsorbent product, H2SO4 0.6 M being the best. Field trials showed that removal efficiency became reduced by the effect of other contaminants, depending on the solution’s initial concentration.
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