Arsenic removal by using colloidal adsorption flotation utilizing Fe(OH)3 floc in a dissolved air flotation system
DOI:
https://doi.org/10.3989/revmetalm.0724Keywords:
Arsenic, Removal, Dissolved air flotation, Fe/As ratioAbstract
In the present work, the influence of Fe/As ratio on the As removal, from aqueous solutions, applying flotation by colloidal adsorption was studied. Ferric chloride was used as coagulant and dodecil sulfate as collector, and arsenic trioxide was utilized to preparing the solutions. The obtained results show that the highest arsenic removal was accomplished in the range of pH between 4 and 5,5, and the increasing of the initial concentration of Fe(III), increases the removal of arsenic from the solution. However, with the decreasing of the initial concentration of arsenic in the solution, it is required a larger Fe/As ratio for its removal. For solutions containing: 13,73, 1,71 and 0,105 mg/L of arsenic, it was shown that to remove around 95% of the dissolved arsenic, a Fe/As ratios of approximately 6/1, 18/1 and 800/1, respectively, are required.
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