Biodegradation of Naphthalene, Phenanthrene and Anthracene by Micrococcus sp., Rhodococcus sp. and Pseudomonas putida were studied. The effects of pH, glucose concentration and inoculum concentration were investigated. Maximum degradation and high microbial growth were observed at pH (7), glucose concentration (500 ppm) and inoculum concentration (3%). To investigate the maximum tolerance potential for the selected bacteria, naphthalene (500-5000 ppm), Phenanthrene and Anthracene (50-500 ppm) were used in the presence of non-ionic surfactants. The examined surfactants (Triton X-100 and...