This report presents cost and performance data for the application of on-site incineration at the FMC Corporation - Yakima Pit (Yakima) Superfund site in Yakima, Washington. A rotary kiln incinerator was operated from January 1993 through May 1993 as part of a remedial action. Contaminants of concern at the site included pesticides and metals.
The Yakima site was the location of a former pesticide manufacturing plant which operated from 1951 until its closure in 1986. Between 1952 and 1969, wastes contaminated with pesticides were disposed of on the site in an unlined waste disposal pit. It was estimated that 2,000 pounds of material was disposed of on the site in the pit. Soil at Yakima was contaminated with 1,1-dichloro-2,2-bis(p-chlorophenyl)ethane (DDD), 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE), 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT), dieldrin, endosulfan, ethion, malathion, parathion, cadmium, chromium, and zinc. During the remedial investigation, the maximum concentrations of these contaminants in mg/kg detected in the soil were DDD (76), DDE (28), DDT (210), dieldrin (40), endosulfan (7,000), ethion (180), malathion (170,000), parathion (3,300), cadmium (6), chromium (320), and zinc (1,020).
A Record of Decision (ROD) signed in September 1990 established a Destruction and Removal Efficiency (DRE) of 99.99% for constituents of concern. In 1991, a Consent Decree was entered in the Eastern District of Washington in which the Responsible Party (RP) for the site agreed to implement the remedial action proposed in the ROD.
The RP conducted remedial activities including the operation of a rotary kiln incinerator to dispose of the contaminated soil. The incineration system at Yakima was comprised of a solid waste feed system; a co-current rotary kiln; a secondary combustion chamber (SCC); and an air pollution control system (APCS).
The incineration equipment was located on six flat bed trailers and several skids. Contaminated material was fed to the incinerator by a jacketed, twin-screw conveyor.
The incinerator volatilized and partially destroyed organic compounds from the contaminated material. Resulting ash from the incinerator was removed by a submerged drag conveyor while the off-gas was drawn into the SCC. The SCC was a down-fired steel shell that provided further combustion of contaminants in the gas.
Off-gas from the SCC was then drawn into the APCS, which was divided into three stages. The first stage, which consisted of a quench tank and two venturis, trapped and collected particulate matter. The second stage, which consisted of a packed bed adsorber and cooling tower, removed acid gases. The third stage, which consisted of an ionized wet scrubber, provided further removal of particulate matter. Ash collected from the incinerator and APCS was sampled and analyzed to determine if it was in compliance with site-specific land disposal requirements, at which time it was either re-incinerated or landfilled on the site.
During the five months of operation, the incinerator processed approximately 5,600 cubic yards of contaminated material. Treatment performance and emissions data collected during this application indicated that all performance standards and emissions requirements were achieved.
The actual cost for remediation using the incineration system was approximately $6,000,000.
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