Factors Influencing the Efficiency of Radiation-induced Degradation of Sodium Cyanide by High Energy Electron Beam
Cyanide waste water contains high concentration cyanide and is highly toxic to human beings. Conventional treatment methods of cyanide waste water have many kinds of disadvantages. The purpose of this study was to evaluate the potential of EB (electron beam) to decompose CN- in an aqueous solution under different conditions. The decomposition rate of CN- by EB was pseudo-first-order kinetic over the applied initial concentrations. The dose destruction constant was strongly dependent on the initial concentration of CN-. Increasing the concentration of dissolved oxygen was more effective on the decomposition of CN- as well as its detoxification. The required irradiation dose to remove 90％ of CN- was 6kGy, 9kGy and 15kGy at the dissolved oxygen concentration of 0.648 mmol/L, 0.28 mmol/L and 0.035 mmol/L, respectively. The decomposition rate of CN- increased with the decreasing of the pH. The decomposition rate at the irradiation dose of 9kGy was 28％, 17％ and 8％ at pH 1, 7 and 13. In addition, CN- was removed more rapidly at lower irradiation dose rate. The decomposition rate of CN- at irradiation dose rate of 50 Gy/s,100 Gy/s and 1500Gy/s was 96％, 90％ and 82％ at an irradiation dose of 6kGy.
electron beam sodium cyanide irradiation degradatio
WANG Jiaoyun YANG Mingde HU Husheng DANG Jie WU Yulong
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）