Evaluation of hydrophobic adsorbents for DNAPL removal

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:354305

Lindsey, W B ^[1]; Buckley, J E ^[2]

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1. SCS Engineers, Springfield, MO (United States)
2. SCS Engineers, Kansas City, MO (United States)

Remediation of groundwater impacted by dense nonaqueous phase liquids (DNAPLs) has proven to be very difficult. Vertical stringers of DNAPLs migrate downward under the force of gravity, displacing water and filling pore spaces. The residual DNAPLs can act as a source of groundwater contamination for many years. Standard technologies focus only on methods to aggressively remove residual DNAPLs by either modification of hydraulic gradients, reduction of DNAPL interfacial tension, or both but have not been successful in complete restoration of DNAPL contaminated aquifers. Recognizing the difficulties in restoring DNAPL impacted aquifers, this paper will propose a feasibility evaluation of an alternative approach to remediation of DNAPL impacted groundwater. Research to test and develop prototype models of the Passive Adsorption Device (PAD), which uses passive in situ adsorption for DNAPL containment and removal, will be described in this paper. Prior technical and limited bench-scale research confirmed the potential for the PAD technology. Research is proposed to evaluate the feasibility of the PAD technology. Bench-scale studies are proposed to evaluate and quantify prototype adsorbent materials and to evaluate the potential radius of influence of the PAD technology. Additional tasks are proposed to identify and evaluate the logistics of fabrication of the PADs, and to perform field pilot-scale tests for placement and retrieval of the PAD from groundwater monitoring wells and performance evaluations of prototype designs.

• OSTI ID: 354305
• Report Number(s): CONF-970677--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORBENTS
ADSORPTION
AQUIFERS
GROUND WATER
IN-SITU PROCESSING
ORGANIC COMPOUNDS
PERFORMANCE TESTING
REMEDIAL ACTION
VOLATILE MATTER