Bio-treatment of Industrial Oil Wastewater by Individual or Consortium Bacterial Species.

Abstract

Discharge of wastewaters without treatment into aquatic and land habitats represents a global environmental problem. This study was aimed to biologically treat oil wastewater by using bacterial isolates individually or in consortium. Twenty bacterial species were isolated from industrial oil wastewater, only four of which were found to have the ability to degrade oil and grease. These isolates were identified according to morphological and biochemical profiles as, Bacillus cereus ATCC 14579, Bacillus cereus, Aeromonas sobria and Klebsiella pneumonia. The ability of Bacillus cereus ATCC 14579, Bacillus cereus, Aeromonas sobria and Klebsiella pneumoniae to treat oil wastewater after 2, 4, 6 days was investigated in single and consortium cultures. The ability of Bacillus cereus ATCC 14579 for treatment oil wastewater was higher than others bacterial isolates. The treatment efficiency of Bacillus cereus ATCC 14579 was 53.1% for EC, 52% for TDS, 92.2% for TSS, 91.2% for COD, and 93.2% for O&G. The treatment efficiency of oil wastewater by bacterial consortium was better than single bacterial culture.