摘要
以水洗废啤酒酵母为吸附剂,采用自制试验装置,对电镀废水中重金属镉进行吸附-沉降工艺试验研究.结果表明,在废水处理量1L,废水中镉质量浓度为26mg/L,pH=7,吸附剂用量40g/L(湿重),室温约25℃,搅拌速度1000r/min,吸附时间30min,沉降240min的条件下,废水中镉的吸附率及吸附—沉降后镉的去除率分别达96.59%和94.25%.三级处理后废水中镉达到排放标准(<0.1mg/L).连续处理效果比间歇处理效果略差.采用扫描电子显微镜及表面能谱,分析了水洗废啤酒酵母对镉的吸附机理.结果表明,水洗废啤酒酵母对镉的吸附过程中细胞结构受到破坏,吸附过程有化学络合和静电吸附作用存在.
The biosorption-sedimentation process for removing the heavy metal cadmium from electroplating wastewater was experimentally investigated taking the waste Saccharomyces cerevisiae as biosorbent on a self-making experimental setup. The results showed that biosorption rate and removed rate of Cd are 96.59% and 94.25% respectively on conditions that wastewater processed is 1 L,Cd concentration in the wastewater about 26 mg/L,pH value 7.0,the dose of the waste Saccharomyces cerevisiae 40 g/L(in wet weight),at room temperature about 25 ℃,stiring speed 1 000 rpm,adsorbing time 30 min and time for natural sedimentation 240 min. The Cd concentration in wastewater after three-step biosorption comes up to china's national standard on effluents(0.1 mg/L). With respect to the processing effect,the continuous process is relatively poorer than the intermittant one. The biosorption mechanism of the water-washing process with waste Saccharomyces cerevisiae for Cd removal was analyzed by SEM and EDS. The results showed that the cell structure of the bacteria used is destroyed in such a water-washing process,and the effects of chemical complexing and electrostatic adsorption are found in the biosorption process.
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2010年第1期127-131,共5页
Journal of Northeastern University(Natural Science)
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)
辽宁省科技计划项目(2006223002)
关键词
工艺试验
电镀废水
水洗废啤酒酵母
连续试验
生物吸附
technological experiment electroplating wastewater water-washing waste Saccharomyces cerevisiae continuous experiment biosorption