Combined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using nZVI and whey: A remedial pilot test

Němeček, Jan; Pokorný, Petr; Lacinová, Lenka; Černík, Miroslav; Masopustová, Zuzana; Lhotský, Ondřej; Filipová, Alena; Cajthaml, Tomáš

doi:10.1016/j.jhazmat.2015.07.056

Cited by 55 publications

(13 citation statements)

References 33 publications

(39 reference statements)

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“…By comparing the experimental data, the bacteria isolated in this study demonstrated a higher chromium reduction efficiency, not only in the initial chromium reduction concentration but also in the chromium reduction time. Furthermore, the leaching method has been mostly used as a strategy for the in situ treatment of polluted soils [53][54][55][56], where the chromate in the soil was continuously eluted by the eluent, typically using the bacteria as the eluent. For example, previous reports demonstrated the use of the bacteria Acidithiobacillus ferrooxidans as the eluent to elute chromium from soil; however, this took as long as 5 weeks [57].…”

Section: The Reducing Ability Of the Isolated Strainsmentioning

confidence: 99%

Isolation and Identification of Chromium Reducing Bacillus Cereus Species from Chromium-Contaminated Soil for the Biological Detoxification of Chromium

Gao

et al. 2020

IJERPH

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Chromium contamination has been an increasing threat to the environment and to human health. Cr(VI) and Cr(III) are the most common states of chromium. However, compared with Cr(III), Cr(VI) is more toxic and more easily absorbed, therefore, it is more harmful to human beings. Thus, the conversion of toxic Cr(VI) into Cr(III) is an accepted strategy for chromium detoxification. Here, we isolated two Bacillus cereus strains with a high chromium tolerance and reduction ability, named B. cereus D and 332, respectively. Both strains demonstrated a strong pH and temperature adaptability and survival under 8 mM Cr(VI). B. cereus D achieved 87.8% Cr(VI) removal in 24 h with an initial 2 mM Cr(VI). Cu(II) was found to increase the removal rate of Cr(VI) significantly. With the addition of 0.4 mM Cu(II), 99.9% of Cr(VI) in the culture was removed by B. cereus 332 in 24 h. This is the highest removal efficiency in the literature that we have seen to date. The immobilization experiments found that sodium alginate with diatomite was the better method for immobilization and B. cereus 332 was more efficient in immobilized cells. Our research provided valuable information and new, highly effective strains for the bioremediation of chromium pollution.

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Section: The Reducing Ability Of the Isolated Strainsmentioning

confidence: 99%

Isolation and Identification of Chromium Reducing Bacillus Cereus Species from Chromium-Contaminated Soil for the Biological Detoxification of Chromium

Gao

et al. 2020

IJERPH

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“…The ZVI is placed in a series of discrete loci to allow the water within the aquifer to flow between (and around) the loci (e.g., [160][161][162][163][164][165]). This avoids the flow by-pass situations which are associated with ZVI permeable reactive barriers (e.g., [166][167][168]).…”

Section: E5 Assessment Of the Significance Of Catalyst Selection On mentioning

confidence: 99%

Provision of Desalinated Irrigation Water by the Desalination of Groundwater within a Saline Aquifer

Antia¹

2016

Hydrology

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Irrigated land accounts for 70% of global water usage and 30% of global agricultural production. Forty percent of this water is derived from groundwater. Approximately 20%-30% of the groundwater sources are saline and 20%-50% of global irrigation water is salinized. Salinization reduces crop yields and the number of crop varieties which can be grown on an arable holding. Structured ZVI (zero valent iron, Fe 0 pellets desalinate water by storing the removed ions as halite (NaCl) within their porosity. This allows an "Aquifer Treatment Zone" to be created within an aquifer, (penetrated by a number of wells (containing ZVI pellets)). This zone is used to supply partially desalinated water directly from a saline aquifer. A modeled reconfigured aquifer producing a continuous flow (e.g., 20 m 3 /day, 7300 m 3 /a) of partially desalinated irrigation water is used to illustrate the impact of porosity, permeability, aquifer heterogeneity, abstraction rate, Aquifer Treatment Zone size, aquifer thickness, optional reinjection, leakage and flow bypass on the product water salinity. This desalination approach has no operating costs (other than abstraction costs (and ZVI regeneration)) and may potentially be able to deliver a continuous flow of partially desalinated water (30%-80% NaCl reduction) for $0.05-0.5/m 3 .

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“…6 Also, reactive fluids containing natural polymers such as scleroglucan, guar and carboxymethyl cellulose (CMC), and the reducing agent sodium thiosulfate have been proposed to trap toxic hexavalent chromium [Cr(VI)] in the subsurface, while reducing it to trivalent chromium [Cr(III)], 7,8 which is nontoxic. [10][11][12][13] In situ remediation technologies rely on effective contact between the pollutants and the reactive species. [10][11][12][13] In situ remediation technologies rely on effective contact between the pollutants and the reactive species.…”

Section: Introductionmentioning

confidence: 99%

Effect of rheology and humic acids on the transport of environmental fluids: Potential implications for soil remediation revealed through microfluidics

Siwik

Pensini

Rodriguez

et al. 2019

J of Applied Polymer Sci

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This study investigated the potential effect of shear rheology and humic acids (HA) on the subsurface transport of polymeric fluids used for the remediation of contaminants. Polymeric fluids were prepared with guar, scleroglucan, and carboxymethyl cellulose (CMC). Guar fluids can be used to suspend reactive particles for contaminant degradation. Fluids prepared with 2.5 g/L of guar in water were viscous, and the crosslinker borax (1 g/L) made them viscoelastic. Microfluidics experiments showed that the increase in elasticity blocked the flow of guar in 350 μm channels. Guar, CMC, or scleroglucan fluids containing sodium thiosulfate can be used to trap toxic Cr(VI) in the subsurface and reduce it to harmless Cr(III). Trapping of Cr(VI) is achieved by the gelation of the fluids upon contact with chromium. Before mixing with chromium, HA did not affect the flow of CMC, guar, and scleroglucan in microfluidic channels. Quartz-crystal microbalance with dissipation monitoring experiments indicates that HA reduced sorption of guar onto silica, potentially promoting the transport of guar fluids in sandy aquifers. While HA slightly decreased the rate of gelation of CMC and scleroglucan upon contact with chromium, it did not affect the fast gelation rate of guar.

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Combined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using nZVI and whey: A remedial pilot test

Cited by 55 publications

References 33 publications

Isolation and Identification of Chromium Reducing Bacillus Cereus Species from Chromium-Contaminated Soil for the Biological Detoxification of Chromium

Isolation and Identification of Chromium Reducing Bacillus Cereus Species from Chromium-Contaminated Soil for the Biological Detoxification of Chromium

Provision of Desalinated Irrigation Water by the Desalination of Groundwater within a Saline Aquifer

Effect of rheology and humic acids on the transport of environmental fluids: Potential implications for soil remediation revealed through microfluidics

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