APPLICATION OF IN-SITU REMEDIATION TECHNOLOGIES BY SUBSURFACE INJECTION

摘要

There are many emerging remedial technologies which require the introduction of various materials to the saturated zone of a contaminated site in an effort to remediate groundwater in-situ. These remedial materials include both chemical compounds as well as proprietary products such as hydrogen release and oxygen release compounds. A common requirement to implement an effective application of many of these materials includes not only the accurate delineation of the contaminated plume and lithology of the geologic formations in which the plume resides, but also a well thought out delivery process which considers the physical properties of the remedial material to be injected and the formation characteristics of the injection site. Injection under pressure will provide greater distribution of materials into the formation providing a more effective remediation. Delivery processes may be developed for unconsolidated overburden formations in sands, silts, clays as well as tills. Alternate delivery processes may be developed for weathered rock and fractured rock formations. These delivery processes may include direct injection as well as re-injectable point methods. Injection pressures can vary from 90 to 700 psi. This paper describes the delivery processes in several formation types, using schematic drawings and discussion.