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 injection 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 groundwater contamination and saturated soil in-situ, producing no 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 very rapid and complete destruction of organic groundwater contamination and contaminants in saturated soil. More conventional remediation technologies, such as soil vapor extraction, 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 free-phase product. With respect to soil contamination, the technology addresses organic contamination within the saturated matrix and the capillary fringe.
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. Laboratory analysis of post-treatment groundwater samples has not indicated the generation of harmful degradation by-products from the Chemical Oxidation Process.
Chemical Oxidation utilizes a proprietary, empirically derived computer modeling program that has been developed from laboratory and field applications over the last decade. This Oxidation Evaluation Modeling Software (OEMS) is used 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.