Effects of carbonate precipitates on long-term performance of granular iron for reductive dechlorination of TCE

被引：75

作者：

Jeen, Sung-Wook ^{[1
]}

Gillham, Robert W. ^{[1
]}

Blowes, David W. ^{[1
]}

机构：

[1] Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2006年 / 40卷 / 20期

关键词：

D O I：

10.1021/es0608747

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Long-term column experiments were conducted to evaluate the effects of secondary carbonate minerals on permeability and reactivity of commercial granular iron treating trichloroethene (TCE). The results showed that carbonate precipitates caused a decrease in reactivity of the iron, and spatially and temporally varying reactivity loss resulted in migration of mineral precipitation fronts, as well as profiles of TCE, pH, alkalinity, calcium, and dissolved iron. In the columns receiving solutions of dissolved calcium carbonate, porosity gradually decreased in proportion to the source concentrations, as carbonate minerals accumulated. However, the rate of porosity loss slowed over time because of the declining reactivity of the iron. Thus, secondary minerals are not likely to accumulate to the extent that there is a substantial reduction in hydraulic conductivity. The reactivity of the iron was found to decrease as an exponential function of the carbonate mineral volume fraction. This changing reactivity of iron should be incorporated into predictive models for improved designs of iron permeable reactive barriers (PRBs).

引用

页码：6432 / 6437

页数：6

共 23 条

[1] Effects of carbonate species on the kinetics of dechlorination of 1,1,1-trichloroethane by zero-valent iron [J].

Agrawal, A ;

Ferguson, WJ ;

Gardner, BO ;

Christ, JA ;

Bandstra, JZ ;

Tratnyek, PG .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2002, 36 (20) :4326-4333

[2] Pathways and kinetics of chlorinated ethylene and chlorinated acetylene reaction with Fe(O) particles [J].

Arnold, WA ;

Roberts, AL .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (09) :1794-1805

[3] SIMPLE TITRIMETRIC METHOD FOR DETERMINATION OF INORGANIC CARBON IN SOILS [J].

BUNDY, LG ;

BREMNER, JM .

SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS, 1972, 36 (02) :273-&

[4] IRON DISSOLUTION AND PASSIVATION IN K2CO3-KHCO3 SOLUTIONS - ROTATING-RING-DISK ELECTRODE AND XPS STUDIES [J].

CASTRO, EB ;

VILCHE, JR ;

ARVIA, AJ .

CORROSION SCIENCE, 1991, 32 (01) :37-50

[5] On the nonlinear relationship between kobs and reductant mass loading in iron batch systems [J].

Cwiertny, DM ;

Roberts, AL .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2005, 39 (22) :8948-8957

[6] Major anion effects on the kinetics and reactivity of granular iron in glass-encased magnet batch reactor experiments [J].

Devlin, JF ;

Allin, KO .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2005, 39 (06) :1868-1874

[7]

Jeen S.-W, 2005, THESIS U WATERLOO WA

[8] Reduction of hydraulic conductivity and reactivity in zero-valent iron columns by oxygen and TNT [J].

Johnson, RL ;

Tratnyek, PG ;

Miehr, R ;

Thoms, RB ;

Bandstra, JZ .

GROUND WATER MONITORING AND REMEDIATION, 2005, 25 (01) :129-136

[9] Kinetics of halogenated organic compound degradation by iron metal [J].

Johnson, TL ;

Scherer, MM ;

Tratnyek, PG .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1996, 30 (08) :2634-2640

[10] The effect of silica on the degradation of organohalides in granular iron columns [J].

Kohn, T ;

Roberts, AL .

JOURNAL OF CONTAMINANT HYDROLOGY, 2006, 83 (1-2) :70-88

← 1 2 3 →