电沉积处理含镉废水的性能研究
doi: 10.13205/j.hjgc.201501006
STUDY ON DIALYSIS OF YAM DIOSGENIN HYDROLYTIC WASTEWATER IN HOMOGENEOUS ION EXCHANGE MEMBRANE
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摘要: 电沉积含镉废水考察溶液的不同初始p H、镉的不同初始浓度、电流密度及金属配合物对电沉积效果的影响,利用SEM和XRD对沉积物的表面形貌和物相成分进行分析,研究沉积物金属的存在形式。实验结果表明,p H在1.5~3.5时,溶液中镉的去除效果达到99.3%;一级动力学常数随着初始镉溶液浓度增加而变大;当电流密度为4.46 m A/cm2进行90 min电沉积时反应速率较快且沉积量最大;氨水与镉形成的配合物可以促进电沉积镉的反应速率;对电沉积后的沉积物进行扫描电镜(SEM)和X-射线衍射(XRD)测试。SEM表明,沉积物呈现树枝状的纳米结构。XRD表明,沉积物主要成分为氢氧化镉和镉。Abstract: The relationship of dialysis time with wastewater conductivity,saltness,the concentration of sulfates,Ca,Mg and organic were studied,in order to investigate the dialysis of yam diosgenin hydrolytic wastewater in homogeneous ion exchange membrane. The results showed that the treatment effect reached steady state after 100 h of dialysis and the conductivity of wastewater and dialysate were practically equal. The separation efficiencies for saltness,H + and SO2 - 4 were 71%,62%, 78% respectively. The removal effect of Ca 2 + was better than that of Mg 2 + . Most of the organic substances were membrane- impermeable in the process of dialysis.
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Key words:
- homogeneous ion exchange membrane /
- dialysis /
- yam diosgenin wastewater /
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