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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/5869


    Title: Combined two-stage xanthate processes for the treatment of copper-containing wastewater
    Authors: Y. K. Chan
    M. H. Leu (呂明和)
    J. E. Chang
    T. F. Lin
    L. C. Chiang
    P. H. Shih
    T. C. Chen
    Keywords: Environmental protection
    Heavy metals
    Wastewater
    Date: 2007
    Issue Date: 2009-11-20 10:49:30 (UTC+8)
    Abstract: Heavy metal removal is mainly conducted by adjusting the wastewater pH to form metal hydroxide precipitates. However, in recent years, the xanthate process with a high metal removal efficiency, attracted attention due to its use of sorption/desorption of heavy metals from aqueous solutions. In this study, two kinds of agricultural xanthates, insoluble peanut-shell xanthate (IPX) and insoluble starch xanthate (ISX), were used as sorbents to treat the copper-containing wastewater(Cu concentration from 50 to 1,000 mg/L). The experimental results showed that the maximum Cu removal efficiency by IPX was 93.5 % in the case of high Cu concentrations, whereby 81.1% of copper could rapidly be removed within one minute. Moreover, copper-containing wastewater could also be treated by ISX over a wide range (50 to 1,000 mg/L) to a level that meets the Taiwan EPA's effluent regulations (3 mg/L) within 20 minutes. Whereas IPX had a maximum binding capacity for copper of 185 mg/g IPX, the capacity for ISX was 120 mg/g ISX. IPX is cheaper than ISX, and has the benefits of a rapid reaction and a high copper binding capacity, however, it exhibits a lower copper removal efficiency. A sequential IPX and ISX treatment (i.e., two-stage xanthate processes) could therefore be an excellent alternative. The results obtained using the two-stage xanthate process revealed an effective copper treatment. The effluent4(Ce) was below 0.6 mg/L, com-pared to the influent (Co) of 1,001 mg/L at pH and a dilution rate of 0.6 h-~.Furthermore, the Cu-ISX complex formed could meet the Taiwan TCLP regulations, and be classified as non-hazardous waste. The xanthatilization of agricultural wastes offers a comprehensive strategy for solving both agricultural waste disposal and metal-containing wastewater treatment problems.
    Relation: Eng. Life Sci. 2007, 7, No. 1, 1-7
    Appears in Collections:[環境工程系所] 期刊論文

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