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This study aims to compare the biodegradability efficiency of spent coolant waste by wild-type microalga versus mutagenised  Scenedesmus vacuolatus . The biodegradation efficiency of both groups microalgae was evaluated using dehydrogenase activity (DHA) and total petroleum hydrocarbon (TPH) degradation using gas chromatography and mass spectrometry (GCMS). The DHA of both microalgae was conducted in relation to the triphenyl formazan production (TPF). The TPH of extracellular hydrocarbon degradation and intracellular hydrocarbons were analysed using GCMS. The data obtained from DHA and GCMS were analysed using analysis of variance at a 5% level of significance (0 &lt; 0.05). The wild-type and mutagenised  S. vacuolatus  showed biodegradation of spent coolant waste after five weeks. The highest TPF produced by wild-type microalgae after five weeks was 1.139 mg/mL ± 0.009. The highest TPF produced by mutagenised  S. vacuolatus  after five weeks was 1.771 mg/mL ± 0.006 which was 1.55-fold higher than the TPF produced by the wild-type microalgae in the treatment weeks. The highest TPH degraded by wild-type after five weeks was 85.87% ± 0.20, while the highest TPH degradation of 100% was observed for the mutagenised  S. vacuolatus  after five weeks of spent coolant waste treatment. These results suggest that the mutagenised  S. vacuolatus  was better in utilising and degrading spent coolant waste and, therefore, can be used to mitigate spent oil pollution.

international journal of environmental analytical chemistry

Comparison of biodegradative efficiency of wildtype versus mutagenised  Scenedesmus vacuolatus  of spent coolant waste: dehydrogenase activity and total petroleum degradation studies