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Metabolic Characteristic Analysis of an Oil Field Wastewater Degrading Strain Chelatococcus G5

An oil field wastewater-degrading strain was isolated from the waste activated sludge of an oil field wastewater treatment plant. The degrading capabilities for oil field wastewater, culture conditions in a liquid enrichment medium, and metabolic characteristics for carbon sources in a Biolog-ECO microplate of this strain were investigated. The 16S rRNA gene sequences of the strain were very similar to each other (>99% similarity) and exhibited a similarity of 98% with other Chelatococcus sp. The COD removal efficiency of the oil field wastewater-degrading strain is 64.3%, based on a batch experiment after strain inoculation for 60 h. Chelatococcus G5 is a mesophilic and NaCl-tolerant strain that can be grown well at pH 7.0, 37 °C, and under shaking conditions. Its NaCl tolerance is up to 5.0%. Based on the metabolic characteristic analysis, up to 54.8% of the carbon sources in the Biolog-ECO microplate could be utilized and only 29.03% of these sources could be easily degraded by Chelatococcus G5.