| Title | Impact of magnetite nanoparticles on the syntrophic dechlorination of 1,2-dichlorIoethane |
| Abstract | In anaerobic environments microorganisms exchange electrons with community members and with soil and groundwater compounds. Interspecies electron transfer (IET) occurs by several mechanisms: diffusion of redox compounds or direct contact between cells. This latter mechanism may be facilitated by the presence of conductive nanoparticles (NP), possibly serving as electron conduits among microorganisms. Our study examined the effect of magnetite (Fe3O4) NP on the dechlorination of 1,2-dichloroethane (1,2-DCA) by a mixed-culture. The addition of NP (170 mg L- 1 total Fe) enhanced the acetate-driven reductive dechlorination of 1,2-DCA to harmless ethene (via reductive dihaloelimination) up to 3.3-times (2.3 ?eq L- 1 d- 1 vs. 0.7 ?eq L- 1 d- 1), while decreasing the lag time by 0.8 times (23 days) when compared to unamended (magnetite-free) microcosms. Dechlorination activity was correlated with the abundance of Dehalococcoides mccartyi, which accounted up to 50% of total bacteria as quantified by CARD-FISH analysis, pointing to a key role of this microorganism in the process. Given the widespread abundance of conductive minerals in the environment, the results of this study may provide new insights into the fate of 1,2-DCA and suggest new tools for its remediation by linking biogeochemical mechanisms. |
| Source | Science of the total environment 624, pp. 17–23 |
| Keywords | 1,2-DichloroethaneDechlorinationDehalococcoides mccartyiMagnetite |
| Journal | Science of the total environment |
| Editor | Elsevier, Lausanne ;, Paesi Bassi |
| Year | 2018 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.scitotenv.2017.12.110 |
| Authors | Leitão, Patrícia; Leitão, Patrícia; Leitão, Patrícia; Aulenta, Federico; Rossetti, Simona; Nouws, Henri P.A.; Danko, Anthony S. |
| Text | 384898 2018 10.1016/j.scitotenv.2017.12.110 Scopus 2 s2.0 85037696435 1,2 Dichloroethane Dechlorination Dehalococcoides mccartyi Magnetite Impact of magnetite nanoparticles on the syntrophic dechlorination of 1,2 dichlorIoethane Leitão, Patricia; Leitão, Patricia; Leitão, Patricia; Aulenta, Federico; Rossetti, Simona; Nouws, Henri P.A.; Danko, Anthony S. Istituto di Ricerca sulle Acque, Italy; Universidade do Porto; Instituto Superior de Engenharia do Porto In anaerobic environments microorganisms exchange electrons with community members and with soil and groundwater compounds. Interspecies electron transfer IET occurs by several mechanisms diffusion of redox compounds or direct contact between cells. This latter mechanism may be facilitated by the presence of conductive nanoparticles NP , possibly serving as electron conduits among microorganisms. Our study examined the effect of magnetite Fe3O4 NP on the dechlorination of 1,2 dichloroethane 1,2 DCA by a mixed culture. The addition of NP 170 mg L 1 total Fe enhanced the acetate driven reductive dechlorination of 1,2 DCA to harmless ethene via reductive dihaloelimination up to 3.3 times 2.3 eq L 1 d 1 vs. 0.7 eq L 1 d 1 , while decreasing the lag time by 0.8 times 23 days when compared to unamended magnetite free microcosms. Dechlorination activity was correlated with the abundance of Dehalococcoides mccartyi, which accounted up to 50% of total bacteria as quantified by CARD FISH analysis, pointing to a key role of this microorganism in the process. Given the widespread abundance of conductive minerals in the environment, the results of this study may provide new insights into the fate of 1,2 DCA and suggest new tools for its remediation by linking biogeochemical mechanisms. 624 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85037696435 origin=inward Articolo in rivista Elsevier 0048 9697 Science of the total environment Science of the total environment Sci. total environ. simona.rossetti ROSSETTI SIMONA federico.aulenta AULENTA FEDERICO |
