Abstract
Iron oxide-coated sand filtration is reported as one of the most viable technological options for arsenic removal from drinking water by the United States Environmental Protection Agency. For substantial utilization of the adsorption properties of iron oxide-coated sand for arsenic removal, it is important to understand the factors contributing to its adsorption capabilities. The effects of seven factors i.e., coating pH, temperature, iron concentration, number of coatings, aging, pH of the solution and mass of the adsorbent on arsenic (V) and arsenic (III) removal were investigated. Two sets of 27-4 fractional factorial design were adopted to identify the significant factors in the arsenic adsorption process. The results showed that coating pH, temperature, and solution pH had the most significant influence on As(V) removal and coating pH, temperature, solution pH and mass of adsorbent had the greatest effect on As(III) removal. The effects of other factors were relatively small on arsenic removal.
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