SECTION THREE
Construction Activities
Contaminated soil traveled through the kiln via gravity. The kiln was operated at a minimum
exit gas temperature of 1599F.
The kiln discharge chamber was sized to reduce the flue gas velocity and remove large
particulate matter in the exit gas stream. The hot gas cyclone subsequently removed
additional particulate matter in the flue gas prior to entering the SCC. The SCC was operated
at a minimum temperature of 1801F and a minimum gas retention time of 2 seconds.
Exhaust gases from the SCC were cooled to 400F using air-atomized, water spray nozzles in
an evaporative cooler. The cooled flue gases then passed through a baghouse for removal of
particulate matter. The baghouse was designed with a 3-to-1 air-to-cloth ratio.
The baghouse gas discharged to an induced draft (ID) fan, which drew gases through the
entire system and discharged them through the wet scrubber system to the discharge stack.
The fan produced negative pressure throughout the incineration system to eliminate fugitive
emissions.
Exhaust gases from the baghouse were cooled from approximately 350F to 185F with
water sprays in the Venturi quench unit. A mildly caustic scrubber water solution neutralized
dissolved acid gases in one of two countercurrent, packed-bed absorbers, which were
operated in parallel. The pH of the scrubber water was maintained between 6.5 and 9 by
addition of a sodium hydroxide solution. The cleaned gas passed through a high-efficiency,
multi-pass mist eliminator for removal of entrained water droplets.
Cleaned flue gas was exhausted through a 150-foot tall stack equipped with continuous
emission monitors (CEMs) that analyzed the gas for oxygen (O2), carbon monoxide (CO),
Bottom ash and fly ash were segregated prior to disposal. Bottom ash consisted of treated
soil from the kiln and ash collected by the cyclone and SCC. Fly ash consisted of ash from
the evaporative cooler and baghouse. Each ash stream was cooled and wetted by spraying
with excess scrubber system water, after which it was conveyed to the ash storage area. A
10,000 cubic feet per minute (cfm) scrubber and Lamella clarifier system captured steam
issuing from the wet ash drag conveyor to prevent off-site migration of particulate matter.
Fly was were tested for TCLP metals as each storage bin was filled. Each day's production of
bottom ash was separated for testing of TCLP metals, Fenac, SVOCs (including
b-naphthylamine), and VOCs. Ash failing the cleanup criteria was retreated. Ash meeting
the cleanup criteria was backfilled on-site. Ash with TCLP concentrations greater than 25
times any of the drinking water standards was stabilized prior to backfill.
In addition to the incineration system, a 100-gallon per minute (gpm) wastewater treatment plant
(WWTP) was installed and operated at the site to remove metals and organic compounds from
various water streams generated during the project. Treated wastewater was discharged to Wet
Creek. Wastewater treated at the WWTP included: incineration system pad cleaning water; ash
handling pad cleaning water; wash water from equipment and personnel decontamination
3-2
Slippery Chemical OU 3 Final RA Report
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