Amounts of recalcitrant plastics in the environment and the time required for their total mineralization to CO2 have recently been fully understood. There is a growing interest in biodegradability of the plastics in landfills (Lee et al., 1991). A major area of environmental concern is the disposal of the solid wastes. Solid wastes which beside plastics include packaging materials, polyurethane, polystrenes, and other polymeric substances are rapidly fulling up available landfill sites. The existence of organisms able to metabolize xenobiotics is of considerable evolutionary interest in the past 50 years (Madigan et al., 1997).