3.4. Identification and biodegradation of microbial species
Gram stain and microscopic examination were conducted on 6 isolates.
The results showed that strain 1 fromcontaminated soil and strain
13 fromused lubricating oil presented similar microscopicmorphology.
Also, lubricant removal rate and cell density were similar in Fig. 1. They
were regarded as the same and strain 13 was chosen for identification.
Similar phenomenon also occurred to strains 6 and 11 isolated from
soil and lubricating oil, respectively,while strain 6 retained greater ability
to stably degrade lubricating oil (Fig. 1). In order to compare their
biodegradation, further tests were conducted.