| dc.description.abstract | Polyethylene is a low-density polymer, widely distributed worldwide and resistant to biodegradation. Therefore, it is important to find microorganisms that carry out the process of biodegradation of polyethylene and to find chemicals that help these organisms in their work with biodegradation. Six bacterial strains were isolated from a piece of plastic waste. The ability of bacteria growth was studied in three different mediums. CO2 was measured for these strains after a 10-week incubation period. Strain ZZ-2 was able to grow better in the presence of PE than in culture without PE in two different media. CuSO4+FeCl2 supplement stimulated the growth of strains ZZ-1, ZZ-7, and ZZ-12,2 in culture containing PE, CuSO4+FeCl2 supplement stimulated the growth of strain ZZ-12,1 in culture containing PE slightly, but CuSO4+FeCl2 supplement inhibited bacterial growth of strain ZZ-6 in this study, this led to the conclusion that CuSO4+FeCl2 supplement is a stimulator or inhibitor of bacterial strains. By using Welch Two sample t-test, the two cultures (Test and Control) were compared for many tests. The CO2 measurement results were significant for strains ZZ-1 and ZZ-2 in the M9++ medium with PE as the only carbon source. | |
