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In-Situ Chemical Oxidation (ISCO)

MECX's In-Situ Chemical Oxidation (ISCO) processes are recognized as some of the most rapid and cost-effective family of innovative treatment technologies to remediate organic contaminants in groundwater and saturated soils.

MECX's In-Situ Chemical Oxidation processes uses innovative application procedures and proprietary formulations of reagents, which are applied directly into the area of concern through direct-push, jet-mixing application and temporary application wells using a carefully controlled low-temperature and low-pressure approach. The reagents then oxidize sorbed and dissolved contaminants in-situ, without producing waste streams that require permitting, treatment, disposal or long-term operation and maintenance.

The principal advantage of the Chemical Oxidation Process over other in-situ chemical remediation treatments is the rapid and complete destruction of organic contaminants. More conventional remediation technologies, such as soil vapor extraction (traditional; non-enhanced), sparging and bioventing, require years to produce concentration reductions of 50 to 90 percent, depending strongly on soil type and the volatility or biodegradability of the contaminant. The Chemical Oxidation Process is primarily directed toward remediation of dissolved-phase contamination and has also been applied to address non-aqueous phase liquid (NAPL), both dense and light.

The basis of the Chemical Oxidation Process is the generation of free radicals and superoxides, which are extremely powerful oxidizers that progressively react with organic contaminants through a series of oxidation reactions. During the process, the organic constituents are converted to progressively less complex and shorter chemical chains, ultimately yielding carbon dioxide and water.

MECX uses a proprietary, empirically derived computer modeling program that we developed from laboratory and field applications over the past 20 years. We use our Oxidation Estimating Tool (OET©) to model and design each Chemical Oxidation Process application. Using information generated from the bench test and relevant site data (e.g., hydrogeology, water chemistry, and contaminant type and concentrations), a customized, site-specific treatment design and dosage application is developed for each field-scale remediation project.

Application of the Chemical Oxidation Process has demonstrated significant contaminant reductions for a variety of organic compounds in groundwater within a short time period following treatment. Based on bench, pilot, and full-scale applications, the Chemical Oxidation Process has been determined to be applicable for the treatment of petroleum-based fuels, chlorinated and non-chlorinated solvents, organic pesticides, and other organic contaminants in groundwater and saturated soil.

One of the advantages of the Chemical Oxidation Process is that it can be bench- and pilot-tested to determine the applicability of the technology for treatment of a specific contaminant at the site in question. The treatment program can be customized to address "hot spots" or portions of the contamination that have not been adequately addressed by selectively adding new application wells and/or providing additional rounds of treatment. During the bench test, groundwater and saturated soil sample(s) from an affected portion of the site are tested to observe the reactivity of the media with reagents and to estimate the appropriate dosage rate for reducing contaminant concentrations. These bench test results, in combination with site geologic and hydrogeologic characteristics, provide the basis for estimating the Chemical Oxidation reagent dosage rate used during the pilot test. The pilot test, usually performed in a contaminated portion of the site, provides data regarding the effectiveness of the technology at the site. Then, application rates and well design parameters (i.e., spacing) appropriate for the full-scale treatment of the site are generated.



Site Candidate Sheet


Solvent Enhanced ISCO Process


Case Study: Chlorinated Solvent and Petroleum Hydrocarbon Contamination at a Former Newspaper Publisher in Framingham, Massachusetts


Case Study: Chlorinated Hydrocarbon Contamination at a Manufacturing Facility in Arkansas


Measuring Effectiveness of In-Situ Chemical Oxidation Followed by Bioremediation


Innovative Heavy Oil Contaminant Remediation at Typical MGP Remediation Sites


Measuring CHEMOX Application Success


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