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The massive production and improper disposal of organohalides resulted in worldwide contamination in soil and water. However, their environmental survey based on chromatographic methods was hindered by challenges in testing the extremely wide variety of organohalides.  Dehalococcoides  as obligate organohalide-respiring bacteria exclusively use organohalides as electron acceptors to support their growth, of which the presence could be coupled with organohalides and, therefore, could be employed as a biomarker of the organohalide pollution. In this study,  Dehalococcoides  was screened in various samples of bioreactors and subsurface environments, showing the wide distribution of  Dehalococcoides  in sludge and sediment. Further laboratory cultivation confirmed the dechlorination activities of those  Dehalococcoides . Among those samples,  Dehalococcoides  accounting for 1.8% of the total microbial community was found in an anaerobic granular sludge sample collected from a full-scale bioreactor treating petroleum wastewater. Experimental evidence suggested that the influent wastewater in the bioreactor contained bromomethane which support the growth of  Dehalococcoides . This study demonstrated that  Dehalococcoides  could be employed as a promising biomarker to test the present of organohalides in wastestreams or other environmental samples.

Dehalococcoides as a Potential Biomarker Evidence for Uncharacterized Organohalides in Environmental Samples