Influence of aquifer heterogeneity on Cr(VI) diffusion and removal from groundwater

Zhang, Weidong; Huang, Xinxiang; Gong, Jianshi; Ma, Lei; Qian, Jiazhong

doi:10.1007/s11356-021-15803-4

Cited by 5 publications

(2 citation statements)

References 77 publications

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“…The Cr content has dramatically increased in recent years, for example, 6–12 ppb in the Godavari River in 2014 [ 4 ] and 10.5–113 ppb in the Yangtze River in 2009 [ 5 ] have been reported. The consistent diffusion of Cr(VI) into groundwater was also detected [ 6 ]. Undoubtedly, Cr species would have a great influence on the drinking-water quality and public health.…”

Section: Introductionmentioning

confidence: 97%

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

et al. 2023

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Emerging chromium (Cr) species have attracted increasing concern. A majority of Cr species, especially hexavalent chromium (Cr(VI)), could lead to lethal effects on human beings, animals, and aquatic lives even at low concentrations. One of the conventional water-treatment methodologies, adsorption, could remove these toxic Cr species efficiently. Additionally, adsorption possesses many advantages, such as being cost-saving, easy to implement, highly efficient and facile to design. Previous research has shown that the application of different adsorbents, such as carbon nanotubes (carbon nanotubes (CNTs) and graphene oxide (GO) and its derivatives), activated carbons (ACs), biochars (BCs), metal-based composites, polymers and others, is being used for Cr species removal from contaminated water and wastewater. The research progress and application of adsorption for Cr removal in recent years are reviewed, the mechanisms of adsorption are also discussed and the development trend of Cr treatment by adsorption is proposed.

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Section: Introductionmentioning

confidence: 97%

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

et al. 2023

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“…Hexavalent chromium [Cr(VI)] is one of the most commonly detected metal contaminants in groundwater. , Approximately 11% of the polluted sites on the U.S. National Priorities List are contaminated by Cr(VI), and persistence of Cr(VI) contamination at concentrations above the maximum contaminant level (MCL) is common, even after decades of remediation. ,, Cost-effective management of long-term contamination of groundwater at low concentrations is particularly challenging. − Most of the remedial technologies designed for fast removal of Cr(VI) (e.g., in situ precipitation or chemical reduction) are less efficient for lasting large plumes of low contaminant concentrations. − Permeable reactive barriers have been used, and yet the loss of permeability due to biofouling or mineral precipitation limits their applicability. , Currently, pump and treat is still the most commonly used approach in dealing with low-level residual Cr(VI) at many contaminated sites, but the generation of large quantities of wastewater and the long-term operating costs hinder its feasibility. , …”

Section: Introductionmentioning

confidence: 99%

Cr(VI) Reduction and Sequestration by FeS Nanoparticles Formed in situ as Aquifer Material Coating to Create a Regenerable Reactive Zone

Liu,

Yang,

Zhu

et al. 2024

Environ. Sci. Technol.

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Remediation of large and dilute plumes of groundwater contaminated by oxidized pollutants such as chromate is a common and difficult challenge. Herein, we show that in situ formation of FeS nanoparticles (using dissolved Fe(II), S(-II), and natural organic matter as a nucleating template) results in uniform coating of aquifer material to create a regenerable reactive zone that mitigates Cr(VI) migration. Flow-through columns packed with quartz sand are amended first with an Fe 2+ solution and then with a HS − solution to form a nano-FeS coating on the sand, which does not hinder permeability. This nano-FeS coating effectively reduces and immobilizes Cr(VI), forming Fe(III)−Cr(III) coprecipitates with negligible detachment from the sand grains. Preconditioning the sand with humic or fulvic acid (used as model natural organic matter (NOM)) further enhances Cr(VI) sequestration, as NOM provides additional binding sites of Fe 2+ and mediates both nucleation and growth of FeS nanoparticles, as verified with spectroscopic and microscopic evidence. Reactivity can be easily replenished by repeating the procedures used to form the reactive coating. These findings demonstrate that such enhancement of attenuation capacity can be an effective option to mitigate Cr(VI) plume migration and exposure, particularly when tackling contaminant rebound post source remediation.

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Enhanced bioremediation of acid mine-influenced groundwater with micro-sized emulsified corn oil droplets (MOD) and sulfate-reducing bacteria (Desulfovibrio vulgaris) in a microcosm assay

Hussain,

Kim,

Kim

et al. 2024

Chemosphere

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Influence of aquifer heterogeneity on Cr(VI) diffusion and removal from groundwater

Cited by 5 publications

References 77 publications

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

Cr(VI) Reduction and Sequestration by FeS Nanoparticles Formed in situ as Aquifer Material Coating to Create a Regenerable Reactive Zone

Enhanced bioremediation of acid mine-influenced groundwater with micro-sized emulsified corn oil droplets (MOD) and sulfate-reducing bacteria (Desulfovibrio vulgaris) in a microcosm assay

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