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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Effect of tubes bundle electrode on removal of cadmium from simulated wastewaters by electrodeposition
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Effect of tubes bundle electrode on removal of cadmium from simulated wastewaters by electrodeposition

机译：管束电极对电沉积去除模拟废水中镉的影响

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BACKGROUND: The performance of a novel pilot scale, fixed bed flow-through cell, consisting of a cathode formed by a bundle of stainless steel tubes having two tube arrangements (920 tubes of 0.6 cm outer diameter and 360 tubes of 1.0 cm outer diameter) was investigated for the removal of cadmium in a batch re-circulation mode. The electrochemical reaction studied was the cathodic reduction of Cd~(+2) using 0.5 mol L~(-1) sodium sulphate as supporting electrolyte. The parameters analyzed were initial Cd~(+2) concentrations and electrolyte flow rates. RESULTS: Experimental results for the two different tube arrangements showed that the mass transfer coefficients were higher for the 0.6 cm diameter tubes than for the 1.0 cm diameter tubes. The former gave a fractional conversion of 80.4% with a current efficiency of 70.75% compared with a fractional conversion of 58.5% with a current efficiency of 45.7%, for the 1.0 cm diameter tubes, for a Cd~(+2) concentration of 200 ppm and flow rate of 250 L h~(-1). These results were correlated to: Sh = 0.411 Re~(0.871) 0.6cm outer diameters tubes Sh = 0.295 Re ~(0.84) 1.0cm outer diameters tub for 5 < Re < 28 and Sc = 649, where Sh is the Sherwood number, Re the Reynolds number and Sc the Schmidt number. CONCLUSION: Experimental results, analysis, correlations and figures of merit showed better performance of the cell for the removal of Cd~(+2) with 0.6 cm diameter tubes than with 1.0 cm diameter tubes.
机译：背景：新型中试规模的固定床流通池的性能包括一个阴极，该阴极由一束由两根不锈钢管（外径为0.6 cm的管和外径为1.0 cm的管）组成的不锈钢管组成。以分批再循环的方式研究了去除镉的方法。电化学反应的研究是使用0.5 mol L〜（-1）硫酸钠作为支持电解质对Cd〜（+2）进行阴极还原。分析的参数为初始Cd〜（+2）浓度和电解液流速。结果：两种不同管布置的实验结果表明，直径为0.6 cm的管的传质系数高于直径为1.0 cm的管。对于直径为1.0 cm的管，当Cd〜（+2）浓度为200时，前者的分数转化率为80.4％，电流效率为70.75％，而分数转化率为58.5％，电流效率为45.7％。 ppm，流速为250 L h〜（-1）。这些结果与以下内容相关：Sh = 0.411 Re〜（0.871）0.6厘米外径的管子Sh = 0.295 Re〜（0.84）1.0厘米外径的管，对于5

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