An enviromental friendly carrier material comprising a bacterial mixture capable of accelerated biological degradation of petroleum hydrocarbons in a sea ice-covered polar region, the bacterial mixture comprising a plurality of isolated different cold-adapted autochthonous bacterial strains each having petroleum hydrocarbons degrading activity at an ambient temperature of −3° C. and each having a different temperature tolerance range, a different salinity tolerance range, a different petroleum hydrocarbons degradation spectrum, and a different capacity to emulsify oil, wherein the bacterial mixture is immobilized on the carrier material, and wherein bacterial the bacterial mixture comprises at least one isolated bacterial strain selected from the group consisting of Rhodococcus GH-t deposited with the German Collection of Microorganisms and Cell Cultures Depository in Braunschweig, Germany (DSMZ) and assigned accession number DSM 18943;
- Dietzia GH-2 deposited with the DSMZ and assigned accession number DSM 18944;
- Shewanella GH-4 deposited with the DSMZ and assigned accession number DSM 18946;
- Marinobacter GH-9 deposited with the DSMZ and assigned accession number DSM 18951;
- Pseudomonas GH-10 deposited with the DSMZ and assigned accession number DSM 18952;
- Oleispira GH-11 deposited with the DSMZ and assigned accession number DSM 18953.