APPLICATION OF NANOSCALE ZERO-VALENT IRON FOR GROUNDWATER REMEDIATION: LABORATORY AND PILOT EXPERIMENTS

NANO ◽  
2008 ◽  
Vol 03 (04) ◽  
pp. 287-289 ◽  
Author(s):  
STEPANKA KLIMKOVA ◽  
MIROSLAV CERNIK ◽  
LENKA LACINOVA ◽  
JAROSLAV NOSEK
Keyword(s):  
Heavy Metals ◽  
Groundwater Remediation ◽  
Laboratory Experiments ◽  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Chlorinated Ethenes ◽  
Soluble Form ◽  
Chemical Decontamination ◽  
Nanoscale Zero Valent Iron

It is known that the reductive effects of zero-valent iron ( Fe 0) and the sorptive capability of iron and its oxides can be used for both the dehalogenation of chlorinated hydrocarbons (CHC), especially of chlorinated ethenes (PCE → TCE → DCE → VC → ethene, ethane), and the removing of heavy metals from groundwater by turning them into a less-soluble form through changes of their oxidation state, or by adsorption. These consequences are being exploited in the construction of iron filling permeable reactive barriers for a longer time.1 The advantages of nanoscale zero-valent iron ( nanoFe 0) over the macroscopic one consist not only in the better reactivity implicit in their greater specific surface area but also in their mobility in rock environment.2,3 Numerous laboratory experiments, especially the batch-agitated experiments, with samples from seven various contaminated localities in Europe have been carried out with the aim to discover the measurement of the reductive effect of the nanoFe 0 on selected contaminants. It was found that the nanoFe 0 can be reliably usable as a reductive reactant for in-situ chemical decontamination of sites polluted by chlorinated ethenes (CEs), or hexa-valent chromium ( Cr VI ). The rate of reductive reaction and the optimal concentrations for the real remediation action were determined. On the basis of these laboratory experiments, the methods for pilot application of nanoFe 0 have been specified. Subsequently the pilot experiments were accomplished in surveyed localities.

Transport characteristics of surface-modified nanoscale zero-valent iron in porous media

2007 ◽  
Vol 55 (1-2) ◽  
pp. 157-162 ◽  
Author(s):  
S.R. Kanel ◽  
H. Choi
Keyword(s):  
Porous Media ◽  
Optimum Concentration ◽  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Anionic Polymer ◽  
Reactive Material ◽  
Nanoscale Zero Valent Iron ◽  
Groundwater Systems ◽  
Surface Modified

Highly efficient, versatile, adsorbent, nanoscale zero-valent iron (NZVI) was synthesised and encapsulated by an anionic polymer to make it a mobile delivery vehicle (DV-NZVI) for in-situ groundwater and soil remediation. NZVI was found to be highly dispersed with surfactant within a size of 1–100 nm. Laboratory column experiments were conducted by employing glass beads as a porous medium to delineate the characteristics of DV-NZVI transport as a reactive material in saturated zones under a number of conditions. It was observed that there was an optimum concentration of polymer, i.e. 6 g/L, for maximum transport of DV-NZVI, at which point, as the flow rate increases, the transport of DV-NZVI increases. Similarly, at the optimum concentration we observed that as the depth of porous media increased, the breakthrough of DV-NZVI was retarded. These results confirmed that DV-NZVI has significant potential for use as a colloidal reactive barrier material in deep groundwater systems in lieu of pump and treat approaches and conventional permeable reactive barriers (PRB).

Preliminary Study on Effects of Nanoscale Amendments on Hyperaccumulator Indian Marigold Grown on Co-Contaminated Soils

2014 ◽  
Vol 955-959 ◽  
pp. 243-247 ◽  
Author(s):  
Jun Jie Du ◽  
Qi Xing Zhou
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Contaminated Soils ◽  
Zero Valent Iron ◽  
Reduced Graphene ◽  
Nanoscale Zero Valent Iron ◽  
Pot Trials ◽  
Preliminary Study

In this study, nanoscale zero-valent iron (nZVI) and nZVI/reduced graphene oxide (RGO-nZVI) nanocomposites were prepared, and the effect of nZVI, RGO-nZVI and graphene oxide (GO) on Indian marigold were examined by pot trials with contaminated soils amended with nanomaterials. The observed results show that 0.05% nZVI and 0.05% RGO-nZVI can wilt the Indian marigold, and they exhibit significant in situ mobility in fluvo-aquic soils. In this paper, the feasibility of improving the phytoremediation efficiency of contaminated soils by amending with nanomaterials is also discussed.

Effects of oxidants on in situ treatment of a DNAPL source by nanoscale zero-valent iron: A field study

2016 ◽  
Vol 107 ◽  
pp. 57-65 ◽  
Author(s):  
Jun-Young Ahn ◽  
Cheolyong Kim ◽  
Hong-Seok Kim ◽  
Kyung-Yup Hwang ◽  
Inseong Hwang
Keyword(s):  
Field Study ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals A porous biochar supported nanoscale zero-valent iron highly efficient for the remediation of cadmium and lead contaminated soil

2021 ◽  
Author(s):  
Wei Qian ◽  
Zeng-Hui Diao
Keyword(s):  
Heavy Metals ◽  
Clayey Soil ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron ◽  
Cadmium And Lead ◽  
Concentration Levels ◽  
Pb Immobilization ◽  
Better Than ◽  
Cd Species ◽  
Simultaneous Immobilization

Abstract Risk associated with heavy metals in soil has been received widespread attention. In this study, a porous biochar supported nanoscale zero-valent iron (BC-nZVI) was applied to immobilize cadmium (Cd) and/or lead (Pb) in clayey soil. Experiment results indicated that the immobilization of Cd or Pb by BC-nZVI process was better than that of BC or nZVI process, and about 80 % of heavy metals immobilization was obtained in BC-nZVI process. Addition of BC-nZVI could increase soil pH and organic matter (SOM). Cd or Pb immobilization was inhibited with coexisting organic compound 2,4-dichlorophenol (2,4-DCP), but 2,4-DCP could be removed in a simultaneous manner with Cd or Pb immobilization at low concentration levels. Simultaneous immobilization of Cd and Pb was achieved in BC-nZVI process, and both Cd and Pb availability significantly decreased. Stable Cd species inculding Cd(OH)2, CdCO3 and CdO were formed, whereas stable Pb species such as PbCO3, PbO and Pb(OH)2 were produced with BC-nZVI treatment. Simultaneous immobilization mechanism of Cd and Pb in soil by BC-nZVI was thereby proposed. This study well demonstrates that BC-nZVI has been emerged as a potential technology for the remediation of multiple metals in soil.

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