Injection of colloidal Fe-0 particles in sand with shear-thinning fluids

被引:42
作者
Cantrell, KJ
Kaplan, DI
Gilmore, TJ
机构
[1] Battelle Memorial Inst., Pacific Northwest Nat Lab., Mailstop K6-81, Richland, WA 99352
[2] Battelle Memorial Inst., Pacific Northwest Nat. Lab., Mailstop K6-81, Richland, WA
来源
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE | 1997年 / 123卷 / 08期
关键词
D O I
10.1061/(ASCE)0733-9372(1997)123:8(786)
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A novel approach to emplacing chemically reactive barriers is the injection of zero-valent iron (Fe-0) colloids into the subsurface. A difficulty encountered in this approach is that the dense Fe-0 colloids (7.6 g/cm(3)) settle out of solution with time, decreasing the distance the colloids can be injected into the subsurface. Studies were conducted to evaluate if several viscous shear-thinning fluids could enhance Fe-0 colloid emplacement in porous media. Aqueous solutions of three nontoxic polymers at different concentrations were investigated: a synthetic high molecular weight polymer [vinyl polymer, (VP)], a biopolymer (gum xanthan, GX), and a cellulose-type polymer (carboxymethyl cellulose, CMC). The use of shear-thinning fluids greatly increases the mobility of the colloidal Fe-0 suspensions in porous media. VP was superior to GX and CMC because the VP suspensions produced the lowest back pressures, resulting in the highest hydraulic conductivities.
引用
收藏
页码:786 / 791
页数:6
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