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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/94589

    Title: 電混凝處理含螯合劑銅之工業廢水機制研究
    Other Titles: Mechanism study for the treatment of wastewater with chelated copper by electrochemical coagulation
    Authors: 洪宇澈;Hung, Yu-Che
    Contributors: 淡江大學水資源及環境工程學系碩士班
    陳俊成;Chen, Luke
    Keywords: 電化學混凝;化學混凝;螯合劑;Cu-EDTA;電鍍工業;Electrochemical coagulation;Chemical Coagulation;Chelating agents;Plating wastewater
    Date: 2013
    Issue Date: 2014-01-23 14:47:55 (UTC+8)
    Abstract: 在電鍍、印刷電路板、金屬表面加工處理等工業中,擁有嚴重的重金屬及有機化合物等污染。製程作業中常使用螯合劑(EDTA)來當作金屬螯合劑,可提高整體的製程效率。由於此類廢此類廢水含有螯合劑,且與金屬離子有很強的螯合性,投入廢水中易形成金屬錯合物,導致以一般傳統化學混凝法無法有效的處理重金屬廢水。
    Plating wastewater containing metal ions with chelating agents to form chelated heavy metal complexes causes ineffectiveness in its treatment by conventional chemical coagulation. This study compares the treatment of wastewater with Cu-EDTA by chemical sedimentation, chemical coagulation and electrochemical coagulation. The mechanisms of the treatment of wastewater with Cu-EDTA by electrochemical coagulation are also studied. In the electrochemical coagulation comparison, different electrolytes, anode materials, operating voltage and chelating metal ratio are tester and compared. This study concludes the following findings:
    1.The organic chelating agent EDTA is destructed by oxidation from both anode oxidation and NaCl electrolyte derived oxidants; hence the chelated copper ions are released into the wastewater solution for further coagulation and removal.
    2.The removal efficiency of the EDTA chelated Cu2+ is decreased with the increased Cu2+ concentration and EDTA/Cu ratio.
    3.Since the chelating constant between the EDTA and Fe is larger than that of EDTA and Cu, it is believed that some Cu2+ are replaced by Fe3+ to chelated with the EDTA in the electrochemical coagulation process.
    4.Precipitation and/or co-precipitation occurred is one of the Cu removal mechanisms where the coagulant produced by electrolysis of metal anode absorbs the Cu2+ released from the chelating Cu-EDTA complexes and precipitated.
    5.The reduction of Cu2+ on the cathode or by the Fe2+ also contribute to the Cu2+ removal.
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Thesis

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