Removal and recovery of fluoride from wastewater by crystallization: effect of aluminum |
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| Authors: | Ke Jiang Kanggen Zhou |
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| Affiliation: | 1. Department of Environmental Engineering, Changsha Environmental Protection Vocational College, Changsha, China;2. School of Metallurgy and Environment, School of Metallurgy and Environment, Central South University, Changsha, China |
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| Abstract: | The effect of aluminum on the treatment of fluorine-containing synthetic wastewater by crystallization was investigated. The results showed that the optimal conditions for fluoride removal were found at pH 7.2–10.5, and at an aluminum concentration of 80–700 mg/L. During operation of the fluidized bed reactor, the effluent fluoride concentration was 13–25 mg/L at an influent aluminum concentration of 80–150 mg/L. The recovered pellets matched well with the national standard of fluorspar in China (GB19321-88). It was feasible to recover calcium fluoride from fluorine and aluminum-containing wastewater by crystallization. |
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| Keywords: | Equilibrium fluidized bed reactor zeta potential calcium fluoride seed |
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