生物吸附-沉降法去除电镀废水中镉  

Removing cadmium from cadmium-containing electroplating wastewater by biosorption-sedimentation

作　　者：代淑娟[1] 魏德洲[1] 白丽梅[2] 周东琴[1] 王玉娟[1] 刘文刚[1] 

机构地区：[1]东北大学资源与土木工程学院,沈阳110004 [2]河北理工大学资源与环境学院,唐山063009

出　　处：《中国有色金属学报》2008年第10期1945-1950,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50174014);辽宁省自然科学基金资助项目(20042021);辽宁省科技计划资助项目(2006223002)

摘　　要：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。The adsorption regular of water-washing waste saccharomyces cerevisiae on cadmium in the wastewater of electroplating factory and sedimentation effect were studied by adsorption-sedimentation method using water-washing waste saccharomyces cerevisiae as adsorbent. The experimental results show that the adsorption rate and removing rate of cadmium are both above 96% under conditions with cadmium concentration in cadmium-containing electroplating wastewater about 26 mg/L, pH of 7.0, the dosage of water-washing waste saccharomyces cerevisiae of 40 g/L （about 72% water） at 18 ~C, the stiring revolution of 800 r/min, adsorption for 30 min and natural sedimentation for 3.5 h. The adsorption mechanism of water-washing waste saccharomyces cerevisiae to cadmium is analysized by TEM, Zeta potential and infrared spectroscopy of the cells. The results show that adsorbing effect occurs on the surface and inside of water-washing waste saccharomyces cerevisiae. The chemistry chelating, electrostatic force, hydrogen bonding and so on all fountion in the adsorption process.

关 键 词：电镀废水 镉 水洗废啤酒酵母 生物吸附 沉降 

分 类 号：X703[环境科学与工程—环境工程]