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Removal of Chromate in Trace Concentration Using Ion Exchange From Tannery Wastewater

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The removal of chromate ions in trace concentration fromtannery wastewatereffluent using Ionexchange techniquewascarried out byvaryingparameterssuch as Chromate concentration and contact time. A maximum of99% removal efficiency in the batch Ion exchange process was achievedoveran equilibriumcontacttime of20min. The equilibriumuptakeof chromate wasconstant at average9.8mglL forinitial chromateconcentrationof! Omg/L irrespective ofthe high concentration of chloride and sulphate ions in the wastewater. This inferred that the interference of these co-ions have no significant effect on the chromate uptake by the ions exchange resins used in this study. While, in the column experiments high effectiveness in the removal of chromate ions in trace concentration was observed.A removal efficiencyof98% of chromate removal was achieved even in the presence ofhigh concentration of competing Ions. Obviously, this has shown the selectively of the resin towards the chromate uptake. The ion-exchange technique was found to be appealing forthe removaloftrace concentrationofchromatewhen in the backgroundthere is high concentration of chloride and sulphate co-ions present in the tannery wastewater.

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