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Show INTRODUCTION The objective of this paper is to describe the recent modifications made to the EPA's mobile incineration system (MIS) and to present operating experiences with the modified system. The MIS was originally designed and constructed to demonstrate the high-temperature incineration of toxic and hazardous wastes (1). The system essentially consists of a refractory-lined rotary kiln, a secondary combustion chamber (SCC), and an air pollution control system mounted on three heavy-duty semi-trailers. Monitoring equipment is carried by a fourth trailer. The MIS was rigorously tested in Edison, N.J. during 1982-83 with PCB-contaminated liquids and other chlorinated organic fluids (2). After completing these tests successfully, the system was modified to enable incineration of solid wastes in a field demonstration. The MIS was transported to the Denney Farm site in McDowell, Missouri in December 1984 for a trial burn on dioxin-contaminated solids and liquids and subsequent field demonstration. The details of the dioxin trial burn conducted at the Denney Farm site have been presented in an EPA report available from the National Technical Information Service (3). A variety of dioxin-contaminated materials was incinerated by the MIS between July 1985 and February 1986. By February 1986, over two million pounds of solids and approximately 180,000 lb of liquids had been incinerated during a total of 170 operating days. The operating experience during the 1985-86 period demonstrated the capacity of the MIS to be 2,000 lb/hr for soil with relatively low moisture content and low heating value. Since the MIS was a prototype system, the on-stream factor was modest (45-55%) during this operation. Two primary causes identified for this on-stream factor were: Excessive particulate accumulated in the SCC. carryover from the kiln which Extensive maintenance required on the irrigated fiberglass mat type particulate gas filter. A detailed discussion of the lessons learned and of the problems encountered during the 1985-86 system operation is provided in reference (3). In February 1986, the system was shutdown for approximately one year. During this shutdown period, a design study was undertaken in order to increase the MIS capacity and increase its on-stream factor. A brief summary of this design study is presented herein. Various system modifications implemented on the MIS as a result of the design study are discussed. The |
