摘要
以小球藻作为生物吸附剂,对废水中Pb2+的吸附进行了研究。研究表明,小球藻对Pb2+的吸附经历了快速的表面吸附和缓慢的吸收2个步骤;吸附液适宜的pH为7左右;且小球藻死体比新鲜藻液对Pb2+的吸附作用要强;吸附液离子强度的增强会降低小球藻对Pb2+的吸附作用;适当强度的光照有利于小球藻对Pb2+的吸附;吸附符合Freundlich等温方程。
Biosorption of heavy metal is an effective technology for the trea tm ent of industrial wastewater. The sorption and biosorption mechanism of Pb2+by Chlorella vulgaris were studied to examine the possibility of metal bioaccumulat ion. The sorption profiles at various conditions including the effects of time, initial pH of solution, the state of Chlorella vulgaris, ionic strength and temp eratures were obtained. The results showed that the kinetics of sorption was rel atively fast, the sorption of Pb2+by Chlorella vulgaris involved two steps: rap id surface sorption and slow sorption. The initial pH of solution was the import ant factor affecting biosorption and the suitable pH was around 7. Dead cells co uld accumulate more Pb2 than fresh cells. The study also proved that ionic stren gth had inhibition effect on the sorption of Pb2+by Chlorella vulgaris, Pb2+bi oaccumulation benefited from the increasing of light intensity. It was found tha t the metal concentration sorbed by alga in solution at equilibrium obeyed the F reundlich equation very well, suggesting involvement of a multiplicity of mechan isms and sorption sites. This study implied the feasibility of large-scale appl ication for the treatment of Pb2+bearing industrial wastewater by the absorbent from Chlorella vulgaris.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2004年第4期696-699,共4页
Journal of Agro-Environment Science
基金
辽宁省博士启动基金资助项目的部分内容(001059)
