Repair of chromium and fluorine contaminated groundwater by nanoparticles ZrO2-SRB
ZHANG Ying1,, ZHANG Lei1,,, LI Xilin2 1.School of Civil Engineering and Architectural, Chuzhou University, Chuzhou 239000, China 2.College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China
Abstract:In order to effectively treat the excessive pollutants in groundwater, such as F?, Cr(Ⅵ), Cr(Ⅲ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ in a certain area of Beijing, based on microbial immobilization technology, the nano-ZrO2-SRB particles were prepared through immobilization of sulfate reducing bacteria (SRB) with the embedding agent of a type of nano-ZrO2-polyacrylamide hybrid material made in laboratory. The optimum reaction conditions of nano-ZrO2-SRB particles reparing polluted groundwater were determined through single factor test. The experimental results showed that at SRB dosage of 35%, the hybrid material dosage of 300 mL, and the reaction temperature of 35 ℃, the removal rate of F?, Cr(Ⅵ), Cr(Ⅲ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ in groundwater reached 92.4%, 99.8%, 99.7% and 70.4%, respectively. The fitting results of reduction and adsorption kinetics showed that the reduction process of Cr(Ⅵ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ by SRB was in accordance with the first-order reduction kinetics, and the adsorption process of F?, Cr(Ⅵ), Cr(Ⅲ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ by hybrid materials was in accordance with the second-order adsorption kinetics. It provides an important reference for the treatment of groundwater polluted by chromium and fluorine. Key words:Cr/ F?/ hybrid materials/ sulfate-reducing bacteria/ nano-ZrO2-SRB particles.
图1SRB投加量对各污染物去除的影响 Figure1.Effect of SRB dosage on the pollutants removal
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1.School of Civil Engineering and Architectural, Chuzhou University, Chuzhou 239000, China 2.College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China Received Date: 2019-07-31 Accepted Date: 2019-10-13 Available Online: 2020-05-12 Keywords:Cr/ F?/ hybrid materials/ sulfate-reducing bacteria/ nano-ZrO2-SRB particles Abstract:In order to effectively treat the excessive pollutants in groundwater, such as F?, Cr(Ⅵ), Cr(Ⅲ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ in a certain area of Beijing, based on microbial immobilization technology, the nano-ZrO2-SRB particles were prepared through immobilization of sulfate reducing bacteria (SRB) with the embedding agent of a type of nano-ZrO2-polyacrylamide hybrid material made in laboratory. The optimum reaction conditions of nano-ZrO2-SRB particles reparing polluted groundwater were determined through single factor test. The experimental results showed that at SRB dosage of 35%, the hybrid material dosage of 300 mL, and the reaction temperature of 35 ℃, the removal rate of F?, Cr(Ⅵ), Cr(Ⅲ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ in groundwater reached 92.4%, 99.8%, 99.7% and 70.4%, respectively. The fitting results of reduction and adsorption kinetics showed that the reduction process of Cr(Ⅵ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ by SRB was in accordance with the first-order reduction kinetics, and the adsorption process of F?, Cr(Ⅵ), Cr(Ⅲ), $ {\rm{SO}}_{\rm{4}}^{{\rm{2 - }}}$ by hybrid materials was in accordance with the second-order adsorption kinetics. It provides an important reference for the treatment of groundwater polluted by chromium and fluorine.
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