Removing cadmium from electroplating wastewater by waste saccharomyces cerevisiae

The appropriate condition and scheme of removing cadmium from electroplating wastewater were investigated by adsorption-precipitation method using waste saccharomyces cerevisiae(WSC) as sorbent. Effect factors on biosorption of cadmium in cadmium-containing electroplating wastewater by waste saccharomyces cerevisiae and precipitation process of waste saccharomyces cerevisiae after adsorbing cadmium were studied. The results show that removal rate of cadmium is over 88% after 30 min adsorbing under the condition of cadmium concentration 26 mg/L, the dosage of waste saccharomyces cerevisiae 16.25 g/L, temperature 18 ℃, pH 6.0 and precipitation time 4 h. Biosorption-precipitation method is effective to remove cadmium in cadmium-containing electroplating wastewater by waste saccharomyces cerevisiae. The SEM, infrared spectroscopy and Zeta-potential of the cells show that chemical chelating is the main adsorption form; electrostatic attraction, hydrogen bonding and van der Waals force all function in adsorption process; and ―NH2―,―C=O―,―C=O―NH―,―CH3, ―OH are the main adsorption groups.

生物吸附-沉降法去除电镀废水中镉

以水洗废啤酒酵母为吸附剂,采用吸附-沉降法,研究水洗废啤酒酵母对电镀废水中镉的吸附规律及沉降效果。结果表明,在废水中镉含量为26mg/L、pH7、水洗废啤酒酵母用量40g/L(含水约72%)、室温(约18℃)、搅拌速度800r/min、吸附时间30min、沉降3.5h的条件下,废水中镉的吸附率及吸附-沉降后镉的去除率均达96%以上。并采用透射电子显微镜、电动电位及红外光谱分析手段,分析水洗废啤酒酵母对镉的吸附机理。水洗废啤酒酵母对镉的吸附不仅发生菌体表面,也发生在菌体内部。吸附过程存在化学络合、静电吸引、氢键等作用。

啤酒酵母吸附镉离子的试验研究

研究了啤酒酵母对镉的生物吸附过程 ,结果表明 ,啤酒酵母吸附镉的速度是非常快的 ;p H对镉的吸附影响较大 ,吸附较佳的 p H范围为 4～ 8,并且啤酒酵母有调节 p H的作用 ,p H为 4～ 8的溶液在吸附反应后 ,其 p H接近于 5 .8;温度、酵母用量、Cd2 +的初始浓度对吸附均有一定的影响。实际含镉废水处理结果表明 ,啤酒酵母处理含镉废水是有效的。

啤酒酵母对镉离子的吸附及镉离子的解吸

研究了啤酒酵母对镉的生物吸附过程及吸附后镉的解析过程。吸附试验表明:啤酒酵母吸附镉的速度非常快;初始pH值对镉的吸附影响较大,吸附过程最佳初始pH范围为4～8之间;啤酒酵母有调节pH值的作用,初始pH值为4～8的溶液在吸附反应后,最终pH值均为5.8左右;酵母用量对吸附有一定影响,但用量不宜过大;Cd2+的初始浓度对吸附影响较小,因而啤酒酵母可处理高浓度含镉废水。解吸试验表明:用稀盐酸可将吸附于啤酒酵母的镉快速解吸,盐酸浓度对解吸率影响不大。