Removal of arsenic from arsenic-containing solution in a three-dimensional electrode reactor

Abstract

Deep treatment, a method for further reducing the content of a target substance, for toxic arsenic (As) from water is vital to reduce environmental pollution and ensure human health. Here, we employed electrosorption of As(V) from water in a self-made three-dimensional reactor with granular activated carbon (GAC). The As(V) concentration can be decreased from 0.5 to 0.032 mg/L under optimal conditions, and all of the As practically presented as H₂AsO₄⁻ without As(III), indicating that there was no redox reaction. After kinetic studies and comparisons of pseudo-second-order kinetic, intra-particle diffusion and Boyd models, the electrosorption could be divided into three steps: internal diffusion from the surface of materials to internal pores, liquid film diffusion from the solution to the surface of materials, and the closure of the entire adsorption process to the equilibrium state. In order to verify the cyclic performance of this process, electrosorption-electrodesorption process research was carried out, and it was found that after 8 cycles, the concentration in the effluent was still only 0.098 mg/L, which was lower than the limitation. Above all, both removal efficiency and disposal of adsorption materials should be ameliorated even though As(V) could be removed in depth and recycled.

Keywords

electrosorption / arsenic / granular activated carbon / three-dimensional electrode reactor / arsenic removal

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