Samples Oil contents (mgL-1) Phenol (ppm)
Untreated Treated Untreated Treated
January 140 90 1.20 0.30
February 480 148 2.67 0.42
March 580 267 3.71 0.78
April 260 114 1.73 0.33
May 344 194 2.15 0.32
June 378 186 2.39 0.49
Table 2: Determination of oil and phenol in waste water before and after treatment of refinery waste water via bacterial consortium.