Optimization of reverse osmosis flowback water treatment using halotolerant microbes naturally enriched in fractured shales
DOI :
https://doi.org/10.18192/osurj.v1i1.3720Résumé
L’eau de reflux récupérée après les opérations de fracturation hydraulique pose un sérieux problème environnemental en raison de la quantité produite et de sa composition chimique toxique. Les méthodes traditionnelles de traitement des eaux usées ne peuvent pas être utilisées pour le traitement de l’eau de reflux en raison de sa forte concentration de solides dissous non biodégradables. Par conséquent, une technologie alternative a été développée pour résoudre ce problème. Le traitement par osmose inverse (OI) en est un exemple. Cependant, les agents gélifiants de guar trouvés dans l’eau de reflux entravent la perméabilité de la membrane et le débit de flux d’eau de l’OI, diminuant par conséquent l’efficacité et l’aspect pratique de cette technologie écologique. Auparavant, une solution biologique utilisant des boues activées pour dégrader la gomme de guar avant le traitement d’OI a été tentée avec un succès limité en raison des effets inhibiteurs de l’hypersalinité (caractérisée par une teneur élevée en solides dissous) sur l’activité microbienne. Pour résoudre ce problème, plusieurs souches de bactéries et d’archées récemment découvertes et naturellement enrichies en schistes fracturés peuvent être utilisées par modification génétique pour dégrader la gomme de guar dans des conditions hypersalines. Ces microbes sont naturellement halotolérants et prospèrent dans des conditions hypersalines, ce qui en fait des cibles
privilégiées pour la modification génétique ciblant divers additifs chimiques dans l’eau de reflux. Ici, nous fournissons un modèle de preuve de concept utilisant ces microbes pour cibler sélectivement la dégradation de la gomme de guar pour améliorer l’efficacité du traitement d’OI.
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