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Accueil du site → Doctorat → Australie → 2020 → Effect of natural biofilm on transport and retention behavior of nanoparticles and microorganisms in limestone sediments : implications for managed aquifer recharge.

Flinders University (2020)

Effect of natural biofilm on transport and retention behavior of nanoparticles and microorganisms in limestone sediments : implications for managed aquifer recharge.

Amirhosein Ramazanpour Esfahani

Titre : Effect of natural biofilm on transport and retention behavior of nanoparticles and microorganisms in limestone sediments : implications for managed aquifer recharge.

Auteur : Amirhosein Ramazanpour Esfahani

Université de soutenance  : Flinders University

Grade : Doctor of Philosophy (PhD) 2020

Résumé partiel
Managed aquifer recharge (MAR) is increasingly becoming a component of water resource management in water stressed arid and semi-arid countries. Surface waters e.g. stormwater or treated wastewaters injected into the aquifer for storage may contain pathogenic bacteria and viruses and engineered nanoparticles, which pose a risk to public health upon subsequent surface reuse. Understanding the behavior of enteric pathogens and engineered nanoparticles in aquifers contributes to the management of this human exposure risk.

In this study, MS2 F-RNA bacteriophage, Escherichia coli (E.coli) and graphene oxide nanoparticles were applied as model virus, bacteria and nanoparticles, respectively. Physically simple and chemically clean sand grains, quartz sediments and limestone sediments were also used as collectors in batch and column studies. RO water with desired pH and ionic strength and treated wastewater obtained from Mount Barker, South Australia were used as aqueous media. Additionally, batch experiments of MS2 inactivation by attachment onto the surfaces of pristine and biofilm-conditioned limestone sediments were conducted at different contact times, initial virus concentrations (103-107 PFU/mL), limestone particle size distributions (0.25-0.5, 0.5-1 and >1 mm), temperatures (4 and 22 °C), agitation status (static and dynamic) and aqueous media (RO water and treated wastewater). The column experiments were conducted in saturated water conditions to mimic the real aquifers. The convection-dispersion equation (CDE) model was used to describe the experimental data of tracer (bromide) transport in sand and limestone columns

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Page publiée le 20 mai 2021