Remediating Ground Water with Zero‐Valent Metals: Chemical Considerations in Barrier Design
- 1 November 1997
- journal article
- Published by Wiley in Ground Water Monitoring & Remediation
- Vol. 17 (4) , 108-114
- https://doi.org/10.1111/j.1745-6592.1997.tb01270.x
Abstract
To gain perspective and insight into the performance of permeable reactive barriers containing granular iron metal, it is useful to compare the degradation kinetics of individual chlorinated solvents over a range of operating conditions. Pseudo first‐order disappearance rate constants normalized to iron surface area concentration (kSA) recently have been reported for this purpose. This paper presents the results of further exploratory data analysis showing the extent to which variation in kSA is due to initial halocarbon concentration, iron type, and other factors. To aid in preliminary design calculations, representative values of kSA and a reactive transport model have been used to calculate the minimum barrier width needed for different ground water flow velocities and degrees of halocarbon conversion. Complete dechlorination of all degradation intermediates requires a wider treatment zone, but the effect is not simply additive because degradation occurs by sequential and parallel reaction pathways.Keywords
This publication has 13 references indexed in Scilit:
- Kinetics of Carbon Tetrachloride Reduction at an Oxide-Free Iron ElectrodeEnvironmental Science & Technology, 1997
- Trichloroethylene and tetrachloroethylene reduction in a metallic iron–water‐vapor batch systemEnvironmental Toxicology and Chemistry, 1997
- Reductive transformation and sorption of cis‐ and trans‐1,2‐dichloroethene in a metallic iron–water systemEnvironmental Toxicology and Chemistry, 1997
- Byproduct Formation During the Reduction of TCE by Zero-Valence Iron and Palladized IronGround Water Monitoring & Remediation, 1997
- Kinetics of Halogenated Organic Compound Degradation by Iron MetalEnvironmental Science & Technology, 1996
- Dechlorination of Trichloroethene in Aqueous Solution Using Fe0Environmental Science & Technology, 1995
- Sorption of Trichloroethylene and Tetrachloroethylene in a Batch Reactive Metallic Iron-Water SystemEnvironmental Science & Technology, 1995
- Reductive Dehalogenation of Chlorinated Methanes by Iron MetalEnvironmental Science & Technology, 1994
- Enhanced Degradation of Halogenated Aliphatics by Zero‐Valent IronGroundwater, 1994
- Analytical solutions for chemical transport with simultaneous adsorption, zero-order production and first-order decayJournal of Hydrology, 1981