Projects per year
Hyporheic zones mediate vinyl chloride (VC) biodegradation in groundwater discharging into surface waters. At the oxic/anoxic interface (OAI) of hyporheic zones subjected to redox oscillations, VC is degraded via coexisting aerobic ethenotrophic and anaerobic reductive dechlorination pathways. However, the identity of aerobic VC degradation pathways (cometabolic vs metabolic) and their interactions with reductive dechlorination in relation to riverbed sediment geochemistry remain ill-defined. We addressed this using microcosms containing OAI sediments incubated under fluctuating oxic/anoxic atmosphere. Under oxic atmosphere, aerobic metabolic VC oxidation was absent in sediments with high total organic carbon (TOC) and VC was reductively dechlorinated to ethene. Ethene was oxidized by ethenotrophs that can degrade VC cometabolically. Contrastingly, VC was metabolically oxidized by ethenotrophs in low-TOC sediments with low reductive dechlorination potential. Accordingly, enrichment and isolation of metabolic VC-oxidizing ethenotrophs was successful only from the low-TOC sediment. Sequence analysis of etnE genes from the microcosms as well phylogenetic typing of the isolates showed that ethenotrophs in the sediments were facultative anaerobic Proteobacteria capable of coping with OAI-associated redox fluctuations. Our results suggest that local sediment heterogeneity supports/selects divergent VC degradation processes at the OAI and that high reductive dechlorination potential suppresses development of aerobic metabolic VC oxidation potential.
FingerprintDive into the research topics of 'Geochemical Parameters and Reductive Dechlorination Determine Aerobic Cometabolic vs Aerobic Metabolic Vinyl Chloride Biodegradation at Oxic/Anoxic Interface of Hyporheic Zones'. Together they form a unique fingerprint.
Biodegradation of cis-Dichloroethene and Vinyl Chloride at Oxic/anoxic Interface of Freshwater Sediment Under Redox Fluctuations
Atashgahi, S. (Creator), Lu, Y. (Creator), Ramiro Garcia, J. (Creator), Peng, P. (Creator), Maphosa, F. (Creator), Sipkema, D. (Creator), Dejonghe, W. (Creator), Smidt, H. (Creator) & Springael, D. (Creator), Wageningen University & Research, 30 Mar 2017
Atashgahi, S. (Creator), Lu, Y. (Creator), Ramiro Garcia, J. (Creator), Peng, P. (Creator), Maphosa, F. (Creator), Sipkema, D. (Creator), Dejonghe, W. (Creator), Smidt, H. (Creator) & Springael, D. (Creator), Wageningen University & Research, 23 Jan 2017
- 1 Finished
AQUAREHAB: Development of rehabilitation technologies and approaches for multipressured degraded waters and the integration of their impact on river basin management
1/05/09 → 31/12/13
Project: EU research project