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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (5): 116-121.doi: 10.11872/j.issn.1005-2518.2017.05.116

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Study on the Treatment of Cyanide Wastewater by Three-dimensional Electrode

SONG Yonghui，YAO Di，ZHANG Shan，TIAN Yuhong，LAN Xinzhe   

  1. Key Laboratory of Gold and Resources of Shaanxi Province，Xi’an University of Architecture and Technology，Xi’an   710055，Shaanxi，China
  • Received:2017-06-29 Revised:2017-08-07 Online:2017-10-30 Published:2018-02-12

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Abstract:

Compared with two-dimensional electrode，three-dimensional electrode system is a very effective wastewater treatment method.It has high efficiency mass transfer，low energy consumption，easily operate equipment and good treatment effect.Activated carbon as the particle electrode，cyanide wastewater was treated by three-dimensional electrode and the effects of applied voltage，treatment time，dosage of the particles and the particle size on ion removal rate were mainly studied in this paper.The results show that the treatment process is mainly electro-deposition and the removal rates of CNT，Cu2+，Zn2+，CN- and SCN- were 93.94%，95.22%，97.23%，99.38% and 94.93% respectively，at a applied voltage of 4 V，pole distance of 10 mm，time of 4 h，particle dosage of 2 g and particle size of 1 mm.The changes in applied voltage lead to the changes in ions removal mode.When the voltage is 2 V，the reaction mechanism of three-dimensional electrodes mainly involves electro-adsorption.Electrolytic deposition plays an important role when the voltage is increased to 3 V or more.Cu2+ and Zn2+ are reduced on the cathode and particle electrode surface，while CN- and SCN- are oxidized and decomposed on the anode.

Key words: cyanide wastewater, three dimensional electrode, wastewater treatment method, applied voltage, treatment time, dosage of the particles, particle size

CLC Number: 

  • TF831

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