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Show Page 7. A SFBC installation to thermally oxidize 1000 T/yr of the above sludge would generate approximately 10,000 Ib/hr steam, a saving of 12 MM BTU/hr or $288,OOO/yr. The savings in disposal costs would be $500,000/yr and operating costs $120,OOO/yr for a net savings of $688,000/yr. Typically the complete equipment including heated storage tank pumps, packaged SFBC unit, waste heat boiler, bag filter piping, ductwork and stack would cost $500,000.00, plus $250,000.00 for engineering, foundations, installation, startup and debugging, for a total of $750,000.00 or a payback of just 13 months. By any standards, this would be an excellent return on investment. Applications In addition to chemical organic wastes, other liquids, sludges and solids suitable for thermal oxidation SFBC's include: paint or resin sludges, refinery residues, acid tar, fuel tank bottoms, used rinses, petroleum coke, spent filter cake, contaminated soil, foundry sand, shale oil rock, dried peat, coal tailings, wood wastes, · pelletized paper, sulfite liquor, plastic scrap (needs scrubbing), biomass, dry agricultural or animal waste. Pilot Plant Testing A mobile SFBC pilot plant is available for testing waste materials. It has 0.6 sq. ft. of bed area and a maximum heat release of 300,000 BTU/hr oxidizing, 1.2 MM BTU/hr gasifying. The unit is equipped with a screw feed system for solids and a liquid/sludge feed system using a progressing cavity metering pump. It includes a fluidizing air blower, startup burner, propane cylinder, bed' quench system, cyclone, control panel and full instrumentation. Everything is mounted on a dual axle trailer making it completely mobile. Many tests have been conducted with the pilot plant, nearly all of them very successfully. The only problems encountered have been due to mechanical difficulties in controlling feed or moisture content. Tested materials include: secondary sewerage sludge, toluene diisocyanate waste, polyol filter cake, coal/water slurry, lagoon sludge, pelletized cardboard, sawdust, wood chips, corn husks, rice hulls, feedlot manure, mushroom mulch. |