The influence of silica and calcium on arsenate sorption to oxide surfaces

被引:38
作者
Smith, SD [1 ]
Edwards, M [1 ]
机构
[1] Virginia Tech, Dept Civil Engn, Blacksburg, VA 24061 USA
来源
JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA | 2005年 / 54卷 / 04期
关键词
adsorption; arsenic; kinetics; silica;
D O I
10.2166/aqua.2005.0019
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Arsenic can be effectively removed from water by sorption to amorphous or granular iron or aluminum oxides. however, silica is known to interfere with arsenic sorption at pH > 7.5. The goal of this work was to examine arsenic sorption to amorphous and granular media oxides at various levels of silica, calcium and pH, and to closely monitor the progress of sorption in these systems. At pH 8.5, calcium dramatically increased arsenic sorption to amorphous iron hydroxide in the presence of silica over relatively short reaction times, but the effects gradually disappeared over longer reaction times. Additionally, batch tests indicated that activated alumina granular media was more sensitive to silica interference than granular ferric hydroxide. However, relatively low levels of calcium could reduce silica interference to arsenic sorption onto activated alumina. While future confirmation research is needed, severe silica interference can occur in practice due to exclusion of arsenate from interstitial granular media pores.
引用
收藏
页码:201 / 211
页数:11
相关论文
共 27 条
[1]   EFFECTS OF SILICON ON THE CRYSTALLIZATION AND ADSORPTION PROPERTIES OF FERRIC OXIDES [J].
ANDERSON, PR ;
BENJAMIN, MM .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1985, 19 (11) :1048-1053
[2]  
[Anonymous], EPA600S283107
[3]  
APHA/AWWA/WEF , 1998, STAND METH EX WAT WA
[4]   Intraparticle diffusion and adsorption of arsenate onto granular ferric hydroxide (GFH) [J].
Badruzzaman, M ;
Westerhoff, P ;
Knappe, DRU .
WATER RESEARCH, 2004, 38 (18) :4002-4012
[5]  
Chen HW, 1999, J AM WATER WORKS ASS, V91, P74
[6]   Modeling silica sorption to iron hydroxide [J].
Davis, CC ;
Chen, HW ;
Edwards, M .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2002, 36 (04) :582-587
[7]   Implications of aqueous silica sorption to iron hydroxide: Mobilization of iron colloids and interference with sorption of arsenate and humic substances [J].
Davis, CC ;
Knocke, WR ;
Edwards, M .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2001, 35 (15) :3158-3162
[8]  
EDWARDS M, 1994, J AM WATER WORKS ASS, V86, P64
[9]  
EMETT MT, 1994, EPD CONGRESS 1994, P153
[10]  
Frey MM, 1997, J AM WATER WORKS ASS, V89, P105