In Situ Reduction Articles & Analysis
21 articles found
Due to the strength of the chlorine – fluorine bond within the molecules, traditional in-situ remediation technologies such as chemical reduction, chemical oxidation, and bioremediation have shown limited success in the treatment of PFAS. ...
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In Situ Bioremediation Eliminated Pump and Treat and Ion-Exhange Treatment Cost Site closure reached in less than half the time and at less than half the cost CL-Out bioremediation was implemented at a confidential manufacturing site to remediate nitrate and perchlorate concentrations in soil and ground water. ...
Multiparameter sonde used in combined remedy approach at former dry cleaning site In-Situ® Inc. multiparameter water quality sonde helps resolve treatment challenges and saves $200,000 in drilling, reagents, and consulting at site contaminated with PCE. ...
The Morses Pond Culvert Site is located in Wellesley, Massachusetts. As shown in Figure 1, the site includes a residential property and portions of properties owned by the Town of Wellesley and the Massachusetts Bay Transportation Authority. Morses Pond drains into a 200-ft long culvert which discharges under the railroad tracks into a pond (Paintshop Pond) downstream of the site. The southern ...
The NRAP site is a state-lead site in its 7th year of groundwater treatment operations by in-situ enhanced reductive dechlorination. The site’s lead agency, the New Mexico Environment Department (NMED), recently completed a response action report to document ongoing progress in their remediation efforts. ...
Problem A US Government site had elevated TCE. Low aquifer pH stalled in situ bioremediation. Project Goal Inject organic substrate in the aquifer to enable naturally-occuring bacteria to effect in situ anaerobic reductive dechlorination Control pH to sustain long-term performance Achieve regulatory remediation levels of 5 µg/L TCE ...
In-Situ® Inc. TROLL® 9500 Multiparameter Sonde helps resolve treatment challenges and saves $200,000 in drilling, reagents, and consulting. ...
In situ chemical reduction (ISCR) and enhanced reductive dehalogenation (ERD) have demonstrated success in the remediation of numerous recalcitrant and toxic compounds, including chlorinated ethenes and hexavalent chromium. ISCR describes the combined effect of stimulated biological oxygen consumption (via fermentation of an organic carbon ...
Microsensor techniques were used to investigate in situ the simultaneous occurrence of sulfate reduction and nitrogen removal in a membrane aerated biofilm reactor. ...
Moreover, and as an illustrative example, environmental, social, and economic aspects of remedial operations have been addressed on a specific case using the US Air Force Sustainable Remediation Tool (SRT).Keywords: SRAM, CLIOS, complex systems, large–scale systems, integrated systems, open systems, socio–technical systems, US Air Force, sustainable remediation tool, SRT™, , sustainable ...
ABSTRACT: In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon. Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride. In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate ...
Elevated levels of trichloroethene (TCE) were found in groundwater at a Department of De-fense (DoD) facility in Charleston, SC. Under an ESTCP-funded in situ technology demonstra-tion project , the Navy had been effectively remediating contamination until a drop in aquifer pH caused dechlorination rates to decline. ...
Average Cr (VI) concentration of 100 mg/kg was assumed in the design of the in‐situ chemical reduction (ISCR) treatment ...
Limited work space, heavy traffic, noise restrictions, and a dense network of utilities are just some of the factors that conspire to make the installation of any in situ plume control or plume reduction system a seemingly unsolvable logistical puzzle. ...
Gold/polyvinyl alcohol nano-composites with two different concentrations of gold (~1.0 wt% and ~2.0 wt% respectively) were prepared via in-situ reduction of gold salt by employing hydrazine hydrate as a reducing agent. ...
The non-ionic surfactant formulations can selectively desorb and liberate contaminants making them more Hydraulically-Available for In-situ pump and treatment (P&T) type processes, more Bio-Available for bioremediation process (In-situ and Ex-situ), and more Chemically-Available for chemical oxidation or reduction type ...
These factors greatly limit the ‘Availability’ of the subject contamination for extraction or treatment during In-situ and Ex-situ remediation treatment. This condition is further exasperated when the contamination is present in fine-grain soil media (i.e., silty sand, to silty clays) with greatly reduced permeability, i.e., K=1x10 to 1x10 cm/sec, and a ...
The paper investigates the main features of NOx emission in a laminar double-jet counter-flow diffusion flame for later use as a possible physical model for NOx reduction through turbine in situ reheat. The oxidizer stream consists of exhaust gas resulted from a conventional combustor and the fuel stream is represented by an ...
In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon. Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride. In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source ...
Because edible oils are relatively immobile and slowly biodegrade in most aquifers, a single, low-cost injection could provide sufficient carbon to drive reductive dechlorination for several years resulting in significantly lower operation and maintenance costs compared to aqueous-phase injection of soluble substrates (Harkness, 2000). While edible oils appear to have many ...