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It is important to construct microbiological treatment systems for organic solvent-contaminated water. We developed a continuous culture supplemented with a biostimulation agent named BD-C, which is formulated from canola oil, and Xanthobacter autotrophicus strain GJ10 for an aerobic dichloromethane (DCM)-dechlorinating microorganism. The continuous culture was a chemostat constructed using a 1 L screw-capped bottle containing artificial wastewater medium with 2.0 mM DCM and 1.0% (v/v) BD-C. The expression of genes for DCM metabolism in the dechlorinating aerobe was monitored and analyzed by reverse transcription-quantitative PCR. Strain GJ10 was able to dechlorinate approximately 74% of the DCM in medium supplemented with BD-C during 12 days of incubation. The DCM dechlorination rate was calculated to be 0.11 mM/day. The ΔΔ C T method showed that expression of haloalkane dehalogenase increased 5.4 times in the presence of BD-C. Based on batch culture growth tests conducted with mineral salt medium containing three DCM concentrations (0.07, 0.20, 0.43 and 0.65 mM) with BD-C, the apparent maximum specific consumption rate (ν max ) and the saturation constant (K s ) determined for DCM degradation in this test were 19.0 nmol/h/CFU and 0.44 mM, respectively. In conclusion, BD-C enhanced the aerobic degradation of DCM by strain GJ10.

journal of oleo science

Aerobic Dechlorination of Dichloromethane Using Biostimulation Agent BD-C in Continuous and Batch Cultures of &lt;i&gt;Xanthobacter autotrophicus&lt;/i&gt; GJ10