| Summary: | 碩士 === 國立臺南大學 === 環境生態研究所碩士班 === 94 === Insoluble starch xanthate (ISX), potassium ethyl xanthate (KEX), and patassium butyl xanthate (KBX) were used to remove heavy metal in wastewater. The operating condition such as concentration, xanthate/metal ion molar ratio, and pH for metal removal were also investigated by batch experiments. The effect of the concentration of sulphate ion and ammonium ion upon heavy metal removal efficiency was also experimented. Finally the optimum operating condition was operated in laboratory Chemical Oxygen Demand (COD) analysis wastewater.
Results from batch metal removal experiments showed that ISX, KEX, and KBX were effective in removing Cr(Ⅲ) and Ag(Ⅰ) in wastewater. The removal of metal ion by KEX and KBX was optimized with xanthate/Cr(Ⅲ) molar ratio at 3. No significant effect on metal removal efficiency was observed with high sulfate ions and ammonium ions concentration, but the removal efficiency was decreased in lower pH condition. Moreover, the xanthate is capable of selective removal of multi heavy metal containments from COD analysis wastewater. The removal capability follows the sequence of mercury ion, silver ion and chromium ion. It was concluded the xanthate process offered a comprehensive strategy for solving multi heavy-metal containing wastewater problems, which could be a worthwhile alternative.
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