In-Situ Chemical Oxidation followed by Enhanced Reductive Dechlorination
| Location: |
Elizabeth, New Jersey |
|
|
| |
|
| Value: |
$
250,000.00 |
| |
|
Panther’s team developed an approach to remediate a concentrated area of groundwater contaminated with chlorinated solvents where dual phase extraction (DPE) was originally planned. Due to much stricter requirements for treated effluent (DSW), the originally designed and constructed DPE treatment system could not be used. The site was an active facility with heavy truck traffic in the area requiring remediation. After evaluating several alternatives, in-situ chemical oxidation was selected as the most viable alternative. This decision was based on site logistical issues, as well as the specific site contaminants and geology. Initially, bench testing was completed to determine the most appropriate chemical oxidant and dosing. Based on these studies, sodium permanganate was selected for injection into the contaminated area.
Implementation was conducted in 2001 and a tight grid (4 foot centers) was established over the affected area (2500 sf). Approximately 1,250 gallons of sodium permanganate was injected into the affected aquifer to chemically oxidize the chlorinated solvents. Three months following treatment, groundwater samples were collected to determine the effectiveness of the injections. Analytical data from groundwater samples indicated a reduction in TCE concentrations over 80%. In early 2002, a second limited injection was conducted in the core area of the plume to further reduce TCE concentrations. Subsequent groundwater sampling indicated that a further reduction in TCE concentrations was achieved, but NJDEP groundwater quality criteria (GWQC) had not been met.
Since the majority of the mass was removed, ERD was used to bring the remaining concentrations of contaminants down to the GWQC. Naturally occurring anaerobic microbes were still present in sufficient quantities to support reductive de-halogenation of the remaining low levels of chlorinated compounds. An additional carbon source was used to maintain the level of microbial respiration required to complete degradation of contaminants. A sodium lactate solution was used to drive the aquifer into a reductive condition and provide a carbon source for the microbes. It is anticipated that final site closure will be obtained within 18 months of the sodium lactate injections. |
Additional Views |
|
|
|
| Back to Project Listings |
©
Panther Technologies, Inc. All rights reserved.
Sitemap
