Removal of Cu and Ni by Free and Immobilized Microalgae

查看全文 作　　者：[1]M.H.WONG;[1]D.C.H.PAK 机构地区：[1]Department of Biology, Hong Kong Baptist College, 224 Waterloo Road, Kowloon,Department of Biology, Hong Kong Baptist College, 224 Waterloo Road, Kowloon Hong Kong,Hong Kong 出　　处：《Biomedical and Environmental Sciences》索引1992年第5卷第2期,共10页 摘　　要：The present investigation evaluated the effectiveness of Chlorella cells in concentrating Cu and Ni in their cells and thereby removing the two metals from solution.The removal efficiency of the two metals by free and immobilized algal cells were further studied.(1)Four types of CHlorella cells,namely Chlorella pyrenoidosa(26)(from Carolina Biological Supplies Company),Chlorella HKBC-1 and-2(isolated from a polluted stream receiving wastewater from several electorlatin factories)and Chlorella HKBC-3(from a clean water pond) were subjected to different concentrations of Cu and Ni accordingly.It was revealed that Chlorella HKBC-1 was the most tolerant species to.Cu and Ni as reflected by their highest values of 48h and 96h“Highest no effect concentrations”(The highest concentration of the tested substance that does not inhibit the growth rate of the alga:Cu 2 and Ni 10mg/l at 48h,Cu2 and Ni 5 at 96h).This was followed by C.pyrenoidosa(26)and then C.HKBE-2 while C. HKBC-3 had the lowest tolerance to the two metals(Cu 0.5 and Ni 2 at 48h;C 0.5and Ni 1mg/l at 96h).(2)It was further revealed that C.HKBC-1 had higher concentration factors and removal efficiencies of Ni(734-963mg/l,16.3-18.7%)and C.HKBC-2 had higher concentration factors and removal efficienceies of Cu(2316-2839mg/l,53.7-66%)when exposed to lower concentrations of Cu(0.5,1and 2mg/l)and Ni(5,10and 13mg/l).(3)By treating the free and immobilized algal cells(algal cells entraped in alginate beads)with different concentrations of Cu and Ni,it was observed that free cell had higher concentration factors and removal efficiencies when compared with immobilized cells(free cells:Cu 1577-3056mg/l,24.2-71.4%;Ni 355-849mg/l,4.8-18.7%;immobilized cells:Cu 453-935mg/l,13.9-53.2%;Ni244-486mg/l,3.2-11.9%). 关 键 词：游离微藻 固定化微藻类 重金属废水 离子浓度 除铜 除镍 CU NI