Enhancing the design of in situ chemical barriers with multicomponent reactive transport modeling

Conference · Tue Nov 01 04:00:00 EST 1994

OSTI ID:10120043

Sevougian, S D; Steefel, C I; Yabusaki, S B

This paper addresses the need for systematic control of field-scale performance in the emplacement and operation of in situ chemical treatment barriers; in particular, it addresses the issue of how the local coupling of reaction kinetics and material heterogeneities at the laboratory or bench scale can be accurately upscaled to the field. The authors have recently developed modeling analysis tools that can explicitly account for all relevant chemical reactions that accompany the transport of reagents and contaminants through a chemically and physically heterogeneous subsurface rock or soil matrix. These tools are incorporated into an enhanced design methodology for in situ chemical treatment technologies, and the new methodology is demonstrated in the ongoing design of a field experiment for the In Situ Redox Manipulation (ISRM) project at the U.S. Department of Energy (DOE) Hanford Site. The ISRM design approach, which systematically integrates bench-scale and site characterization information, provides an ideal test for the new reactive transport techniques. The need for the enhanced chemistry capability is demonstrated by an example that shows how intra-aqueous redox kinetics can affect the transport of reactive solutes. Simulations are carried out on massively parallel computer architectures to resolve the influence of multiscale heterogeneities on multicomponent, multidimensional reactive transport. The technology will soon be available to design larger-scale remediation schemes.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 10120043
• Report Number(s): PNL-SA--24087; CONF-941124--13; ON: DE95007267
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220
99 GENERAL AND MISCELLANEOUS
990200
CHEMICAL REACTION KINETICS
CHEMICAL WASTES
CHEMICALS MONITORING AND TRANSPORT
CONTAMINATION
ENVIRONMENTAL TRANSPORT
FLOW MODELS
GROUND WATER
MATHEMATICS AND COMPUTERS
REMEDIAL ACTION
ROCK-FLUID INTERACTIONS
SITE CHARACTERIZATION
WASTE-ROCK INTERACTIONS