Enhanced Reductive Dechlorination of TCE in a Basalt Aquifer

Conference · Thu Apr 01 00:00:00 EST 1999

OSTI ID:911369

Sorenson, Kent Soren; Peterson, Lance Nutting; Ely, R L

A field evaluation of enhanced reductive dechlorination of trichloroethene (TCE) in ground water has been in progress since November 1998 to determine whether in situ biodegradation can be significantly enhanced through the addition of an electron donor (lactate). An in situ treatment cell was established in the residual source area of a large TCE plume in a fractured basalt aquifer utilizing continuous ground water extraction approximately 150 meters downgradient of the injection location. After a 1-month tracer test and baseline sampling period, the pulsed injection of lactate was begun. Ground water samples were collected from 11 sampling points on a biweekly basis and in situ water quality parameters were recorded every 4 hours at two locations. Within 2 weeks after the initial lactate injection, dissolved oxygen and redox potential were observed to decrease substantially at all sampling locations within 40 m of the injection well. Decreases in nitrate and sulfate concentrations were also observed. Both quantitative in situ rate estimation methods and qualitative measures such as changes in redox conditions, decreases in chlorine number, and changes in biomass indicator parameters are being used throughout the test to evaluate the extent to which biodegradation of TCE is enhanced.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC07-99ID-13727
• OSTI ID: 911369
• Report Number(s): INEEL/CON-99-00244; TRN: US200724%%733
• Resource Relation: Conference: In Situ and On-Site Bioremediation,San Diego, CA,04/19/1999,04/22/1999
• Country of Publication: United States
• Language: English

Related Subjects

54 - ENVIRONMENTAL SCIENCES
AQUIFERS
BASALT
BINDING ENERGY
BIODEGRADATION
BIOMASS
BIOREMEDIATION
CHLORINE
DECHLORINATION
DISSOLVED GASES
ELECTRONS
GROUND WATER
INJECTION WELLS
LACTATES
NITRATES
OXYGEN
PLUMES
REDOX POTENTIAL
SAMPLING
SULFATES
VALENCE
WATER QUALITY
dechlorination
in situ biodegradation
nitrate
oxygen
redox
sulfate
trichloroethene