Also, confine the drainage, and build neutralization basins. The particles absorb chemicals and provide surfaces for bacteria. There are substantial opportunities for gaseous emissions to be reduced across the range of industries responsible for the emissions. With CFCs, H has been removed and Cl or F substituted. These compounds are very stable in the troposphere, have few enemies, and reach the stratosphere where they become chemically active and destroy the earth's protective ozone layer.
Principal uses are refrigeration, air conditioning, and metal cleaning.
See Table 15.8 for the phaseout timetable for the halogenated organics. Apply careful facility design to avoid overcapacity in air conditioning and refrigeration. However, aqueous and semiaqueous cleaning processes have potential air and water emissions and may increase energy use. Halons should be phased out for fire protection equipment in buildings. Existing equipment should be well maintainted to avoid leaks.