OCR Text |
Show 5.9.15 A slanted horizontal design or a vertical orientation are most often used for these types of waste (see Fig. 8) COMBUSTORS High intensity combustors have been utilized for waste liquids with heating values from 4500 Btu/lb. to 18,000 Btu/lb. and higher. Proper atomization and proper mixing of the combustion air with the vaporized droplet have allowed the oxidation reaction to occur instantaneously. Even slower burning chlorinated hydrocarbons are completely hydrolyzed to carbon dioxide and hydrogen chloride in this type of combustor, minimizing the free chlorine generated. Figure 9 indicates the heat capacity of liquid wastes and most often is a means of determining when a waste can be adequately combusted in a burner, and when downstream injection of the waste is required. As the heating value drops, note that with a minimum of 20% excess air, the irunimum flame temperature of 2200°F can be maintained to a certain level of heating value. With a downstream injection design, auxiliary fuel will be needed to maintain satisfactory combustion of the organics at 1800°F. Figures 10 and 11 are typical designs using waste through the combustor or injection into a downstream chamber. SUMMARY In reviewing the methods of disposal of hazardous liquid waste, it has been determined that a properly designed incinerator system will safely meet the 99.99% DRE as regulated by RCRA. Many incineration systems design will fail to meet this if the system does not recognize the problems associated with storage, transport, atomization and combustion. A flaw in the proper design or selection of the components will not provide the continuous 4 - 9 • s destruction required. Many systems do include the features described above and have proven over the years that 99.99-*-% can be achieved on a continuous basis. Owners and operators should strive to include these designs in their consideration for hazardous liquid waste disposal. |