%0 Journal Article %T Do natural biofilm impact nZVI mobility and interactions with porous media? A column study %+ Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) %+ Universität Stuttgart [Stuttgart] %A Crampon, Marc %A Hellal, Jennifer %A Mouvet, Christophe %A Wille, Guillaume %A Michel, Caroline %A Wiener, Anke %A Braun, Juergen %A Ollivier, Patrick %< avec comité de lecture %@ 0048-9697 %J Science of the Total Environment %I Elsevier %V 610-611 %P 709 - 719 %8 2018-01 %D 2018 %R 10.1016/j.scitotenv.2017.08.106 %Z Environmental SciencesJournal articles %X present, altering NP mobility and/or reactivity and thereby NP effectiveness. The influence of the presence of amulti species biofilm on the mobility of two types of zero-valent iron NP (nZVI; NANOFER 25S and optimizedNANOFER STAR, NanoIron s.r.o. (Czech Republic))was tested in laboratory experiments with columns mimickingaquifer conditions. Biofilmswere grown in columns filledwith sand in nitrate reducing conditions using groundwaterfrom an industrial site as inoculum. After two months growth, they were composed of several bacterialspecies, dominated by Pseudomonas stutzeri. Biofilm strongly affected the physical characteristics of the sand, decreasingtotal porosity from~30% to ~15%, and creating preferential pathwayswith high flowvelocities. nZVI suspensionswere injected into the columns at a seepage velocity of 10m day−1. Presence of biofilm did not impactthe concentrations of Fe at the column outlet nor the amount of total Fe retained in the sand, as attested by themeasurement of magnetic susceptibility. However, it had a significant impact on NP size sorting as well as ontotal Fe distribution along the column. This suggests nZVI-biofilm interactions that were confirmed by microscopicobservations using SEM/STEM coupled with energy-dispersive X-ray spectroscopy. Our study showsthat biofilm modifies the water flow velocity in the porous media, favoring the transport of large aggregatesand decreased NP mobility due to physical and chemical interactions. %G English %L hal-01652867 %U https://brgm.hal.science/hal-01652867 %~ SDE %~ BRGM %~ GIP-BE %~ HAL-PIVOTS %~ BRGM-DO