Abstract
In this paper, a method is determined, removing arsenic from waste acid by adding Fe and CuSO4. Through orthogonal experiment, further analyze the effect of different factors on the removal rate of arsenic in this method. L16(44) orthogonal experiments were employed to optimize the process parameters such as temperature, the reaction time, pH, and the molar ratio of Fe/As. Based on the results of the orthogonal experiment, the optimum experimental conditions were that: pH was 8, temperature was 80 °C, the reaction time was 30 min, and the molar ratio of Fe/As was 8. Through range analysis, it was found that the order of significant factors for the removal rate of arsenic in waste acid is the reaction time > pH > temperature > the molar ratio of Fe/As. The optimized technological parameter was selected for verification experiment. Forming iron oxides and hydroxides via Fe powder corroded, which adopt adsorption coprecipitation mechanism to remove arsenic from waste acid. Besides that, the most important point is that Cu–Fe battery is formed by adding CuSO4 to accelerate the corrosion of Fe powder, which could indirectly increase the efficiency of arsenic removal. From the above, the Cu–Fe battery and the adsorption process are very important to arsenic removal, which have close connection with the reaction time and pH. It is consistent with range analysis of orthogonal experiment.
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