Arsenic removal from water by iron-sulphide minerals

被引:11
作者
Han, JT [1 ]
Fyfe, WS
机构
[1] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
[2] Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada
来源
CHINESE SCIENCE BULLETIN | 2000年 / 45卷 / 15期
关键词
arsenic contamination; arsenic removal; iron-sulphide minerals;
D O I
10.1007/BF02886253
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In bench-scaled experiments, iron-sulphide minerals, pyrite and pyrrhotite are used as adsorbents for arsenic removal from As-spiked water of As5+ and As3+ species. The adsorption rate, efficiency, As-adsorption stability and the associated pH conditions have been examined. Observations indicate that these iron-sulphide minerals are very efficient to adsorb arsenic from water for both As5+ and As3+ species. Similar to other studies, As3+-adsorption shows a slower rate than As3+. The stability of the adsorbed arsenic seems closely related to the pH values of the solution. A lower pH level commonly less than 4.0 is required to protect the adsorbed arsenic from serious oxidation and backward release. Fining of the mineral powders and shaking of the solution during adsorption enhance the adsorption efficiency and adsorption rate. For practical use of the method presented in this study, the waste produced should be managed with great care to keep it from redistribution over water system. A further study of the protection for the waste from oxidation on real water systems will greatly enhance the application of the strong ability of arsenic adsorption by these minerals, which is observed from this study.
引用
收藏
页码:1430 / 1434
页数:5
相关论文
共 24 条
[1]   ARSENIC SPECIATION IN THE ENVIRONMENT [J].
CULLEN, WR ;
REIMER, KJ .
CHEMICAL REVIEWS, 1989, 89 (04) :713-764
[2]  
Darnley A.G., 1995, GLOBAL GEOCHEMICAL D
[3]  
Gebel TW, 1999, SCIENCE, V283, P1458
[4]  
Gorby Michael S., 1994, V27, P1
[5]   Arsenic removal from drinking water during coagulation [J].
Hering, JG ;
Chen, PY ;
Wilkie, JA ;
Elimelech, M .
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 1997, 123 (08) :800-807
[6]  
Hering JG, 1996, J AM WATER WORKS ASS, V88, P155
[7]  
JACOBSON G, 1998, COGEOENVIRONMENT NEW, V3, P9
[8]  
Jekel Martin R., 1994, V26, P119
[9]  
JONES CJ, 1978, J HAZARD MATER, V2, P333
[10]   Meeting briefs - Toxicologists shed new light on old poisons [J].
Kaiser, J .
SCIENCE, 1998, 279 (5358) :1850-1851