Hydraulic fracturing to improve nutrient and oxygen delivery for in-situ bioreclamation
A serious problem in the implementation of in situ bioreclamation is the delivery of nutrients and oxygen to soil of low permeability. The problem commonly requires contaminated soil to be excavated for bioreclamation, resulting in increased exposure to toxic materials, liability and cost. The authors demonstrated that is feasible to create hydraulic fractures at shallow depths (several m) in silty clay till. Fractures created during a recent field test were flat-lying and roughly equant in plan with a maximum dimension of 8 m. Coarse sand was pumped into the fractures to hold them open. The sand was an average of 1.1 cm in maximum thickness. As many as four fractures were created from the same borehole, stacked at vertical spacing of 15 or 30 cm. The technique will be used to deliver slow-releasing granules of nutrients and encapsulated oxygen compounds in an effort to enhance in situ bioreclamation of contaminated soil.
- Research Organization:
- Cincinnati Univ., OH (United States)
- OSTI ID:
- 5892541
- Report Number(s):
- PB-92-121334/XAB; CNN: EPA-68-C9-0031
- Resource Relation:
- Other Information: In situ Bioreclamation Jnl. p67-82. Prepared in cooperation with National Urban League, Inc., Cincinnati, OH. Center Hill Lab., and Cincinnati Univ. Medical Center, OH. Sponsored by Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
SOILS
DECONTAMINATION
TOXIC MATERIALS
BIODEGRADATION
BOREHOLES
ENCAPSULATION
FIELD TESTS
FLUID INJECTION PROCESSES
HYDRAULIC FRACTURING
IN-SITU PROCESSING
LAND POLLUTION
LAND RECLAMATION
NUTRIENTS
OXYGEN COMPOUNDS
REMEDIAL ACTION
WASTE DISPOSAL
CAVITIES
CHEMICAL REACTIONS
CLEANING
DECOMPOSITION
FRACTURING
MANAGEMENT
MATERIALS
POLLUTION
PROCESSING
TESTING
WASTE MANAGEMENT
540250* - Environment
Terrestrial- Site Resource & Use Studies- (1990-)
560300 - Chemicals Metabolism & Toxicology