Technology:
On-Site Incineration
- Solids pretreated by shredding, screening, and mixing with lime
- Incineration system consisting of rotary kiln and secondary combustion chamber (SCC)
- Enclosed conveyor transported contaminated soil and debris to the unit
- Soil residence time of 1 hour, kiln temperature of 1,250°F, SCC temperature of 1,750°F
- Treated soil and debris (incinerator ash) discharged into cooler, where it was sprayed with water
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Cleanup Authority:
CERCLA and State: Missouri
- ROD Date: 9/29/88
- PRP-lead
SIC Code:
2834 (Pharmaceutical Preparations) | Point of Contact:
Robert W. Feild
Remedial Project Manager
U.S. EPA Region 7
726 Minnesota Avenue
Kansas City, KS 66101
(913) 551-7697 |
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Contaminants:
Dioxins
- 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in soil and debris
- TCDD concentrations up to 1,800 µg/kg |
Waste Source:
Road Oiling - Application of TCDD-containing waste oils to roadways for dust control |
Type/Quantity of Media Treated:
Soil and Debris
- 265,000 tons of soil and debris
- Moisture content: soil - geometric mean value of 7.8% |
Purpose/Significance of Application:
Incinerator acts as the sole treatment unit in the State of Missouri for TCDD-contaminated soil and debris; system treated soil and debris from 27 sites |
Regulatory Requirements/Cleanup Goals:
- On-site Soil - Background concentrations of 20 µg/kg or less
- Destruction and Removal Efficiency (DRE) of 99.9999% for TCDD as required by Resource Conservation and Recovery Act (RCRA) incinerator regulations in 40 CFR part 264, subpart O |
Results:
- Emissions and trial burn data indicate that all DRE and emission standards have been met
- 1,900 tons of incinerator ash required re-incineration because it did not meet landfilling criteria
- Analytical data of residuals (including re-incinerated ash) indicate that cleanup goals have been met thus far |
Description:
Between 1970 and 1972, a pharmaceutical and chemical company produced wastes that contained TCDD from the production of hexachlorophene. A waste oil company mixed this waste with waste oil and used the mixture to spray roads in Times Beach and the surrounding areas to control dust. A remedial investigation determined that soil was contaminated at 27 sites in the State of Missouri; Times Beach served as a central treatment facility for these sites. A Record of Decision (ROD), signed in September 1988, specified on-site incineration as the remediation technology for the excavated soil and debris. Site cleanup goals and DRE standards were specified for TCDD.
On-site incineration using the IT Corporation Hybrid Thermal Treatment System® began in March 1996 and was completed in June 1997. The treatment system consisted of a rotary kiln and an SCC. An enclosed conveyor moved the soil and debris to the kiln for treatment. Treated ash from the incinerator was discharged to a cooler where it was quenched with water. During its operation, the incinerator at Time Beach processed 265,000 tons of soil and debris. Incineration achieved the soil cleanup goals specified in the ROD, including 1,900 tons of incinerator ash that met soil cleanup goals only after re-incineration.
The total cost of the Remedial Action was approximately $110,000,000. |
