TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Amount: The butane substrates contains 10 weight% of butane, 50 weight% of butane, 90 weight% of butane or 99 weight% of n-butane.    TECHNOLOGY FOCUS - BIOLOGY - Preferred Bacteria: The butane-utilizing-bacteria in the degradation of PCB pollutant belonging to the genus of Pseudomonas, Variovorax, Nocardia, Chryseobacterium, Comamonas, Aeromonas, Sternotrophomonas, Sphingobacterium, Shewanella, Phyllobacterium, Clavibacter, Alcaligenes, Gordona, Carynebacterium and/or Cytophaga. The butane-utilizing-bacteria belongs to the species putida, rubrisubalbicans, aeruginosa, paradoxus, aestriodes, brasilinesis, restricta, globerula, indologenes, meningosepticum, acidovorans, delafieldii, rhodochrous, erythropolis, fascians, barkeri, esteroaromaticum, saperdae, varians, kristinae, caviae, maltophilia, thalpophilum, spiritivorum, putrefaciens B, myrsinacearum, michiganense, xylosoxydans, terrae, aquaticum B and/or johnsonae.    TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Pollutant: The PCB pollutant is present within a soil, gas preferably air or liquid preferably water is either treated in-situ at a contaminated site or ex-situ in a bioreactor. The soil contains greater than 10 ppm of PCB pollutant and less than 2 ppm preferably less than 1 ppm of PCB pollutant after treatment with the bacteria. The liquid contains 0.5 ppb of PCB pollutant after the treatment with the butane-utilizing-bacteria. Preferred Method: Degradation of PCB pollutant involves treating the PCB pollutant with butane-utilizing-bacteria in the presence of butane which is provided during a portion of the treatment time or for substantially constant rate during the entire treatment time in pulses along with oxygen. Alternatively PCB pollutant is degraded by supplying the butane substrate comprising butane (at least 10 weight%) as most prevalent compound to the contaminated site and supplying oxygen containing gas to the contaminated site. SPECIFIC COMPOUNDS - Specific microorganism: The butane-utilizing-bacteria is selected from Pseudomonas rubrisubalbicans, Variovorax paradoxus, Nocardia restricta, Chryseobacterium indologenes, Comamonas acidovorans, Acidovorax delafieldii, Rhodococcus rhodochrous, Rhodococcus erythropolis, Aureobacterium esteroaromaticum, Aureobacterium saperdae, Micrococus varians, Micrococcus kristinae, Aeromonas caviae, Sternotrophomonas maltophilia, Sphingobacterium thalpophilum, Clavibacter michiganense, Alcaligenes xylosoxydans, Carynebacterium aquaticum B and/or Cytophaga johnsonae.    EXAMPLE - Soil samples were collected from hazardous waste site which contains soil contaminated with the released Aroclor 1248 (a PCB congener). 10g of the soil was placed in 120 ml serum bottles after blending. Each sample was handled aseptically, sterilized and the butane was replaced in the head space of the serum bottle. Butane was added at a concentration of 6% v/v concentration each week for 19 weeks. After 12 weeks the samples were blended in sterile bowls and analyzed using a gas chromatography. The result showed that the initial concentration of the PCB congener was 9.50 ppm while the final concentration after 19 weeks was 3.00 ppm comparatively a control showed an initial concentration of 9.97 ppm and final concentration of 8.46 ppm.