This report presents cost and performance data for the application of on-site incineration at the Old Midland Products Superfund site in Ola, Arkansas. A rotary kiln incinerator was operated from June 1992 through May 1993 as part of a remedial action. Contaminants of concern at the site included pentachlorophenol (PCP) and polynuclear aromatic hydrocarbons (PAHs).
The Old Midland Products site was a former creosote and pentachlorophenol wood preserving plant and sawmill that operated from 1969 to 1979. During this time, effluent from wood preserving processes was discharged to on-site lagoons. Soil and sediment in the area of the lagoons were found to be contaminated with PCP and PAHs in concentrations as high as 5,900 mg/kg and 38,000 mg/kg, respectively.
In March 1988, a Record of Decision (ROD) was signed for the site, specifying incineration of surface soils, lagoon sludge, and sediments. The remedial action was conducted by the state of Arkansas, but was financed under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). The material specified for excavation and incineration included approximately 2,770 cubic yards of sludges, 850 cubic yards of sediment, and up to 21,000 cubic yards of soil. The ROD specified incinerator requirements that included a destruction and removal efficiencies (DRE) of 99.99% or 99.9999%, depending on the constituent. The ROD also specified that approximately 450,000 gallons of contaminated groundwater were to be pumped and treated on site. The remainder of this report will address only the incineration as required by the ROD, unless otherwise stated.
The selected incineration system consisted of a feed system; a rotary kiln; a secondary combustion chamber (SCC); and an air pollution control system (APCS). Excavated material was taken to a feed preparation building where it was screened and mixed with cement kiln dust prior to being fed to the kiln.
The resulting ash was discharged from the kiln and conveyed to an ash storage area while exhaust gases were channeled to the SCC. The SCC provided for further combustion of organics in the off-gases, which were then quenched with water.
The APCS consisted of a baghouse, a venturi quencher, and a scrubber. Particulate removal occurred in the baghouse. The venturi quencher cooled the gas, then the scrubber removed acid gases.
During the 9 months of operation, the incinerator processed approximately 102,000 tons of soil, sludge, and sediment. Treatment performance and air monitoring data collected during this application indicated that all performance standards and monitoring requirements were met.
The total cost for remediation using the incineration system was approximately $27,000,000.
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