IN-PILE THERMAL DESORPTION OF DIOXIN CONTAMINATED SOIL AND SEDIMENT
Polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs, or more simply, dioxins) are known human carcinogens. Dioxins are formed as by-products in the manufacture of organochlorides, in the incineration of chlorine-containing substances such as PVC (polyvinyl chloride), in the bleaching of paper, and from natural sources such as forest fires. There have been many incidents of dioxin pollution resulting from industrial emissions and accidents; the earliest known incidents having occurred in the mid-18th century. Releases of dioxins related to industrial activity are known to have occurred in many countries. Environmental restoration of dioxin-impacted sites has typically involved removal of impacted soils ands sediments, with either containment in a chemical disposal facility or incineration. Dioxins decompose at temperature ranges as low as 300 to 400℃ in oxygen-deficient conditions. The authors are in the process of evaluating a number of sites for the application of TerraTherms In-Pile Thermal Desorption (IPTD) process as a means of performing thorough onsite thermal desorption and decomposition of dioxins. The benefits of on site treatment are no off-site transport costs, elimination of potential vehicular accidents associated with offsite transport and disposal, no long term liability, and unlimited onsite use of the impacted soils and/or sediment after treatment. TerraTherms design options include the use of a series of treatment piles or treatment cells, the latter of which each have a capacity of approximately 600 m3, with a treatment time of 40 - 45 days. For treatment of PCDD/Fcontaminated soil or sediment, the treatment piles or cells are heated under negative pressure to a minimum target temperature of 325℃. Multiple treatment piles or cells allow for the sequencing of treatment such that some are in operation while others are being constructed and yet others are in a cool-down mode / being sampled to confirm cleanup. Thus equipment and labor resources can be shared, allowing costs to be optimized.
Baker R.S. Smith G.J. Braatz H
TerraTherm,Inc.,10 Stevens Rd.,Fitchburg,MA 01420 USA DPRA,Inc.,3841 Vardon Court,Woodridge,IL 60517 USA SheGoTec Japan,Inc.,Delice-Mita Bldg. 1st Floor,7-23 Mita 2-chome,Minato-ku,Tokyo 108,Japan
国际会议
北京
英文
1-6
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）