Removal of Zinc Ions from Aqueous Solutions by Micro-Electrolysis and Iron Hydroxide Self-Flocculation

Abstract:

This study was performed to determine the feasibility of enhancing removal of zinc ions from aqueous solutions using an iron-carbon internal micro-electrolysis (ICIME) followed by iron hydroxide self-flocculation (IHSF) process. Results shown that the Zn²⁺ removal using ICIME was improved by IHSF significantly. The pH=3, mass ratio of Fe/AC=2: 1, hydraulic reaction time=30min of ICIME and pH=9, both aeration time and static placing time were 60min of IHSF were proposed as the optimum conditions. Under these conditions, the removal efficiency and residual concentration of Zn²⁺ from lead and zinc smelting wastewater were reached 99.10%, 1.32mg/L. Meanwhile, other metal ions and the F^- also were removed effectively. Lead and zinc smelting wastewater could meet the discharging standard (integrated wastewater discharge standard (GB8978-1996)) of China. The Zn²⁺ removal was significantly influenced by other metal ions existing in aqueous solutions. Contrast and breakthrough time experiment indicated the Compare with single Fe and ICIME, ICIME followed by IHSF have a higher efficiency and bearing capacity for Zn²⁺ removal. ICIME removal of Zn²⁺ enhanced by IHSF is a feasible method.

• Periodical: Applied Mechanics and Materials (Volume 700)
• Pages: 230-234
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.700.230
• Online since: December 2014
• Authors: Tian Guo Li, Xiao Jun Xu*, Shu Li Liu, Rui Nie
• Keywords: Micro-Electrolysis, Removal, Self-Flocculation, Smelting Wastewater, Zinc

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