Corrective action application

Corrective Action Application An acidic groundwater at a Florida site (pH 2.5-3) required treatment. The groundwater was collected by extraction wells, pumped to an above-ground reactor, and neutralized with lime. In the course of neutralizing the waste stream, precipitates were formed which were removed by clarification and filtration prior to discharge. Sludges produced from the clarification and filtration steps were dewatered by a filter press. 

Corrective Action Application At a hazardous waste treatment storage and disposal facility in Washington State, a cyanide-bearing waste required treatment. The influent waste stream contained 15 percent cyanide. Electrolytic oxidation was used to reduce the cyanide concentration to less than 5 percent. Alkaline chlorination was used to further reduce the cyanide concentration to 50 mg/1 (the cleanup objective). The electrolytic process was used as a first stage treatment because the heat of reaction, using alkaline chlorination to treat the concentrated cyanide waste, would be so great that it would melt the reactor tank. 

Corrective Action Application At a RCRA site in the southwest, a waste stream containing hexavalent chromium was reduced to the trivalent form. The trivalent chromium was then removed using ion exchange. The influent hexavalent chromium... 

Corrective Action Application At a Navy facility in Guam, approximately 25 tons of PCB contaminated soil was treated using the KPEG (potassium polyethylene glycol) process. PCB concentrations were reduced from 3000 ppm to less than 5 ppm. Upon completion of treatment using the KPEG process, the soil was neutralized from a pH of 14 to 7. A full-scale system for this process is currently under development. 

Corrective Action Application Hydrolysis was favorably applied to a site in which the wastewater contained very soluble, refractory organics. In addition, tars were being produced in high quantities on this site. Both of these problems were solved using a hydrolyzer. Figure 17 illustrates a flow diagram of this process. As a result, the wastewater treatment goals were achieved, and the production of tar was reduced. 

Corrective Action Application At a dry cleaning facility in a desert area of California, an underground solvent storage tank was found to have leaked for many years. The soil from the 100-ft x 160-ft by 20-ft... 

Corrective Action Application Case 1 - Groundwater at the MEMOREX Computer Tape Plant (Santa Clara, California) was contaminated by a leaking underground solvent storage tank (Skladany et al., 1987). Chemical analysis of the groundwater identified the presence of methyl ethyl ketone (MEK) up to 500 ppm xylenes together with ethyl benzene up to 40 ppm cyclohexanone up to 30 ppm cyclohexanol up to 10 ppm acetone up to 10 ppm and toluene, tetrahydrofuran, 2-butanol, and methyl propyl ketone each less than 1 ppm. A biological... 

Corrective Action Application Case 1 - A spill occurred at the Houston Chemical Company (located in Texas County, Missouri) in June 1979 (U.S. EPA, 1984). An estimated 15,000 gallons of a 5 percent solution of pentachlorophenol (PCP) in diesel oil was released as shown in Figure 27. The emergency physical cleanup operations performed at the site were ... 

Corrective Action Applications Case 1 - The U.S. Army Toxic and Hazardous Materials Agency... 

Corrective Action Application Fluidized bed incineration has been used to incinerate municipal wastewater treatment plant sludge, oil refinery waste, some pharmaceutical wastes, and some chemical wastes including phenolic waste, and methyl methacrylate. Heat recovery is piossible. 

Corrective Action Application Circulating fluidized bed incinerators are ready for full-scale testing under the EPA SITE Program. A unit is now in the RCRA permitting process. 

Corrective Action Application This technology is currently being evaluated under the Superfund Innovative Technology Evaluation (SITE) Program. 

Corrective Action Application In Massachusetts, a municipal wastewater treatment plant receives a number of wastestreams containing heavy metals from local industries. When tested, the dewatered sludge failed the EP toxicity test. In order to permit landfill disposal of the sludge, solidification processes were examined. A soluble, silicate-based system, developed by Chemfix, was ultimately selected which produced a product whose leachate passed the EP toxicity test (Sullivan, 1984). 

Corrective Action Application Documentation on the application of this technology is limited for RCRA sites. 

Corrective Action Application TRW Corporation has developed one type of encapsulation system (U.S.EPA 1980). The TRW surface encapsulation requires that the waste material be thoroughly dried. The dried waste is stirred into an acetone solution of modified... 

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