Abstract
Trichloroethylene (TCE) was a widely used industrial solvent but is now regarded as a notorious groundwater contaminant. Both physicochemical and biological methods have been applied to remediate groundwater contaminated by TCE. For medium to low level of TCE contamination, bioremediation could be more cost-effective. However, bioremediation approaches suffer from slow degradation rates and accumulation of vinyl chloride (VC). In addition, bioaugmentation is often highly encouraged but may introduce foreign genes and increase the pace of microbial evolution. In this study, a microbiome reengineering strategy by heat selection is applied to solve these problems. Out of eight heat-treated mixed cultures, two showed a much-improved TCE degradation rate, more than 70 times higher than the untreated. The biodegradation half-life (t1/2) of TCE was 0.0627 d or shorter. No VC was detected by a gas chromatography equipped with flame ionization detector (GC-FID) and only a minimal amount by a GC-mass spectrometer (GC-MS). Ethene achieved a fairly good mass balance. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and next-generation sequencing (NGS) results showed that the heating process did not kill most bacteria, but Dehalococcoides were either not present or very scarce. Acetoanaerobium and Methanosarcina could be the most important species in this reductive dechlorination process. Kinetic study results showed that the maximum specific TCE degradation rate was approximately 1,271 nmole/min/mg cell protein, which are two orders of magnitude higher than that of the mixed cultures reported in literature. These results suggest that apart from biostimulation and bioaugmentation, microbiome reengineering could be a promising approach for rapid bioremediation of TCE-contaminated aquifers.
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Funding
This study was partially funded by a research grant (MOST 106-2622-E-005-006-CC3) by the Ministry of Science and Technology in Taiwan (Taiwan MOST). The views or opinions expressed in this article are those of the writers and should not be construed as opinions of Taiwan MOST. Mention of trade names, vendor names, or commercial products does not constitute endorsement or recommendation by Taiwan MOST.
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Research Highlights
• The selected culture degraded TCE with a half-life as short as 0.063 d or 1.5 h.
• The maximum specific TCE degradation rate is approximately 1271 nmole/min/mg cell protein.
• The predominant microbes are either archaea or endospore-forming Clostridia.
• Heat treatment did not kill most microorganisms but reengineered the microbiome.
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Chan, AL., Tseng, CY., Chen, TW. et al. Microbiome Reengineering by Heat Selection for Rapid Biodegradation of Trichloroethylene with Minimal Vinyl Chloride Formation. Water Air Soil Pollut 232, 121 (2021). https://doi.org/10.1007/s11270-021-05028-z
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DOI: https://doi.org/10.1007/s11270-021-05028-z