Enhanced Pb(Ii) Removal from Water Using Conductive Carbonaceous Nanomaterials as Bacterial Scaffolds : An Experimental and Modelling Approach
Electrochemically active bacteria (EAB) can use Pb(II) as their terminal electron acceptor to gain energy for growth under anaerobic conditions. This study demonstrated the abilities of EAB as bio-catalysts for Pb(II) bioreduction in an attached growth reactor. Electrically conductive carbon nanofibers (CNF) were used as bacterial scaffolds to facilitate electron transfer between EAB and Pb(II). The CNF attached growth reactor removed >80% and >90% of Pb(II) from solution and maintained Pb(II) levels <0.10 mg/L over repeated Pb(II) dosages dosed at 0.5 mg/L and 5 mg/L, respectively. Experimental measurements provided evidence that Pb(II) was reduced to Pb0, suggesting that Pb(II) was adsorbed onto CNFs, and subsequently bioreduced. Numerical modelling was used to estimate Pb(II) concentrations along the CNFs via capturing Pb(II)’s diffusive transport, and the removal mechanisms governed by EAB and CNF adsorption. The model simulation demonstrated that Pb(II) bioreduction was dominant in the reactor and the significance of Monod kinetics, biofilm thickness and Pb(II) dosage concentration on its removal. This study is the first to prove EAB’s ability to treat Pb(II) from contaminated waters in an attached growth configuration. The findings here demonstrate that conductive substrates can boost biological treatment efficacies which may be required to meet stringent water guidelines
Year of publication: |
[2022]
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Authors: | Chidiac, Cassandra ; Kim, Younggy ; de Lannoy, Charles-François |
Publisher: |
[S.l.] : SSRN |
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freely available
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