@article{fdi:010075271,
  title = {{A} field-pilot for passive bioremediation of {A}s-rich acid mine drainage},
  author = {{F}ernandez-{R}ojo, {L}. and {C}asiot, {C}. and {L}aroche, {E}. and {T}ardy, {V}. and {B}runeel, {O}dile and {D}elpoux, {S}. and {D}esoeuvre, {A}. and {G}rapin, {G}. and {S}avignac, {J}. and {B}oisson, {J}. and {M}orin, {G}. and {B}attaglia-{B}runet, {F}. and {J}oulian, {C}. and {H}ery, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} field-pilot bioreactor exploiting microbial iron ({F}e) oxidation and subsequent arsenic ({A}s) and {F}e co-precipitation was monitored during 6 months for the passive treatment of {A}s-rich acid mine drainage ({AMD}). {I}t was implemented at the {C}arnoules mining site (southern {F}rance) where {AMD} contained 790-1315 mg {L}-1 {F}e({II}) and 84-152 mg {L}-1 {A}s, mainly as {A}s({I}ll) (78-83%). {T}he bioreactor consisted in five shallow trays of 1.5 m(2) in series, continuously fed with {AMD} by natural flow. {W}e monitored the flow rate and the water physico-chemistry including redox {F}e and {A}s speciation. {H}ydraulic retention time ({HRT}) was calculated and the precipitates formed inside the bioreactor were characterized (mineralogy, {F}e and {A}s content, {A}s redox state). {S}ince {A}s({III}) oxidation improves {A}s retention onto {F}e minerals, bacteria with the capacity to oxidize {A}s({III}) were quantified through their marker gene aio{A}. {A}rsenic removal yields in the pilot ranged between 3% and 97% (average rate (1.8 +/- 0.8) {X} 10(-8) mol {L}-1 s(-1)), and were positively correlated to {HRT} and inlet water dissolved oxygen concentration. {F}e removal yields did not exceed 11% (average rate (7 +/- 5) {X} 10(-8) mol {L}-1 s(-1)). {I}n the first 32 days the precipitate contained tooeleite, a rare arsenite ferric sulfate mineral. {T}hen, it evolved toward an amorphous ferric arsenate phase. {T}he {A}s/{F}e molar ratio and {A}s({V}) to total {A}s proportion increased from 0.29 to 0.86 and from similar to 20% to 99%, respectively. {T}he number of bacterial aio{A} gene copies increased ten-fold during the first 48 days and stabilized thereafter. {T}hese results and the monitoring of arsenic speciation in the inlet and the outlet water, provide evidences that {A}s({III}) oxidized in the pilot. {T}he biotreatment system we designed proved to be suitable for high {A}s {DMA}. {T}he formation of sludge highly enriched into {A}s({V}) rather than {A}s({III}) is advantageous in the perspective of long term storage.},
  keywords = {{F}ield bioreactor ; {P}assive treatment ; {A}s({III}) oxidation ; {A}morphous ferric arsenate ; {T}ooeleite ; {A}rsenic removal rate ; {FRANCE} ; {CARNOULES}},
  booktitle = {},
  journal = {{J}ournal of {E}nvironmental {M}anagement},
  volume = {232},
  numero = {},
  pages = {910--918},
  ISSN = {0301-4797},
  year = {2019},
  DOI = {10.1016/j.jenvman.2018.11.116},
  URL = {https://www.documentation.ird.fr/hor/fdi:010075271},
}