Combining nanoscale zero-valent iron with electrokinetic treatment for remediation of chlorinated ethenes and promoting biodegradation: A long-term field study

Czinnerová, Marie; Vološčuková, Ondřejka; Marková, Kristýna; Ševců, Alena; Černík, Miroslav; Nosek, J.

doi:10.1016/j.watres.2020.115692

Cited by 37 publications

(32 citation statements)

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“…Furthermore, detection of the ethenotroph functional gene etnE indicated the potential for ethenotroph-mediated aerobic biodegradation of CE metabolites. Co-occurrence of OHRB and VC assimilating bacteria has also been found in groundwater[17,52,53] and discrete aquifer soil samples[25] at other sites.…”

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confidence: 66%

“…Although nZVI toxicity to microorganisms has been demonstrated in laboratory studies [12][13][14], field studies show only mild or short-term impacts on indigenous bacterial populations [15][16][17]. OHRB include a range of bacterial genera, including Desulfitobacterium, Dehalobacter, Geobacter and Sulfurospirillum, all of which utilize different reductases that can dechlorinate PCE to TCE and cis-1,2-dichloroethene (cDCE) [18].…”

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confidence: 99%

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In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities

et al. 2020

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Background Nanoscale zero-valent iron (nZVI) is commonly used for remediation of groundwater contaminated by chlorinated ethenes (CEs); however, its long-term reactivity and subsurface transport are limited. A novel nZVI–AC material, consisting of colloidal activated carbon (AC) with embedded nZVI clusters, was developed with the aim of overcoming the limitations of nZVI alone. Results Application of a limited amount of nZVI–AC to an oxic, nitrate-rich, highly permeable quaternary aquifer triggered time-limited transformation of CEs, with noticeable involvement of reductive dechlorination. Reductive dechlorination of CEs was dominantly abiotic, as an increase in the concentration of vinyl chloride (VC) and ethene did not coincide with an increase in the abundance of reductive biomarkers for complete dechlorination of CEs (Dehalococcoides, Dehalogenimonas, VC reductase genes vcrA and bvcA). Application of nZVI–AC under unfavourable hydrochemical conditions resulted in no dramatic change in the microbial community, the reducing effect resulting in temporal proliferation of nitrate and iron reducers only. At a later stage, generation of reduced iron induced an increase in iron-oxidizing bacteria. High concentrations and a continuous mass influx of competing electron acceptors (nitrate and dissolved oxygen) created unfavourable conditions for sulphate-reducers and organohalide-respiring bacteria, though it allowed the survival of aerobic microorganisms of the genera Pseudomonas, Polaromonas and Rhodoferax, known for their ability to assimilate VC or cis-1,2-dichloroethene. A potential for aerobic oxidative degradation of CE metabolites was also indicated by detection of the ethenotroph functional gene etnE. Conclusions This pilot study, based on the application of nZVI–AC, failed to provide a sustainable effect on CE contamination; however, it provided valuable insights into induced hydrogeochemical and microbial processes that could help in designing full-scale applications.

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confidence: 66%

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confidence: 99%

In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities

et al. 2020

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“…In the in situ remediation of Cr(VI)contaminated groundwater with nZVI, no inhibition of the density of cultured psychrophilic bacteria was observed nor of the specific phospholipid fatty acid concentrations of the bacteria present (Němeček et al, 2014). Another long-term field study, which combined nZVI with electrokinetic treatment for the remediation of chlorinated ethenes (Czinnerová et al, 2020), reported a temporary negative impact on total biomass of indigenous bacteria in the well near the cathode but not in the well near the anode. This finding was attributed to a dilution/displacement effect of the nZVI suspension or the high doses of nZVI, although the microbial population was restored within 15 days.…”

Section: Isolation Identification and Characterization Of Cultured Bacteriamentioning

confidence: 99%

“…This uncertainty extends to the prediction of the effects of in situ remediation using nZVI relative to those observed in lab experiments since there is only limited information. However, available in situ remediation results point to an attenuated or non-existent toxic effect of nZVI treatments (Němeček et al, 2014;Kocur et al, 2016;Czinnerová et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effects of in situ Remediation With Nanoscale Zero Valence Iron on the Physicochemical Conditions and Bacterial Communities of Groundwater Contaminated With Arsenic

et al. 2021

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Nanoscale Zero-Valent Iron (nZVI) is a cost-effective nanomaterial that is widely used to remove a broad range of metal(loid)s and organic contaminants from soil and groundwater. In some cases, this material alters the taxonomic and functional composition of the bacterial communities present in these matrices; however, there is no conclusive data that can be generalized to all scenarios. Here we studied the effect of nZVI application in situ on groundwater from the site of an abandoned fertilizer factory in Asturias, Spain, mainly polluted with arsenic (As). The geochemical characteristics of the water correspond to a microaerophilic and oligotrophic environment. Physico-chemical and microbiological (cultured and total bacterial diversity) parameters were monitored before and after nZVI application over six months. nZVI treatment led to a marked increase in Fe(II) concentration and a notable fall in the oxidation-reduction potential during the first month of treatment. A substantial decrease in the concentration of As during the first days of treatment was observed, although strong fluctuations were subsequently detected in most of the wells throughout the six-month experiment. The possible toxic effects of nZVI on groundwater bacteria could not be clearly determined from direct observation of those bacteria after staining with viability dyes. The number of cultured bacteria increased during the first two weeks of the treatment, although this was followed by a continuous decrease for the following two weeks, reaching levels moderately below the initial number at the end of sampling, and by changes in their taxonomic composition. Most bacteria were tolerant to high As(V) concentrations and showed the presence of diverse As resistance genes. A more complete study of the structure and diversity of the bacterial community in the groundwater using automated ribosomal intergenic spacer analysis (ARISA) and sequencing of the 16S rRNA amplicons by Illumina confirmed significant alterations in its composition, with a reduction in richness and diversity (the latter evidenced by Illumina data) after treatment with nZVI. The anaerobic conditions stimulated by treatment favored the development of sulfate-reducing bacteria, thereby opening up the possibility to achieve more efficient removal of As.

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“…The results suggest that the investigated methodology opens the door for NPs' use in soilwashing remediation [115]. Recently, Czinnerova et al [114] conducted a long-term field study that investigated the degradation of chlorinated ethenes (CEs) by using nZVI supported by electrokinetic (EK) treatment (nZVI-EK) [114]. EK may enhance the nZVI impact on soil bacteria and increased the migration and longevity of nZVI.…”

Section: Combined Nanoremediation With Other Remediation Technologymentioning

confidence: 99%

Recent Advances of Nanoremediation Technologies for Soil and Groundwater Remediation: A Review

Alazaiza

Albahnasawi

Ali

et al. 2021

Water

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Nanotechnology has been widely used in many fields including in soil and groundwater remediation. Nanoremediation has emerged as an effective, rapid, and efficient technology for soil and groundwater contaminated with petroleum pollutants and heavy metals. This review provides an overview of the application of nanomaterials for environmental cleanup, such as soil and groundwater remediation. Four types of nanomaterials, namely nanoscale zero-valent iron (nZVI), carbon nanotubes (CNTs), and metallic and magnetic nanoparticles (MNPs), are presented and discussed. In addition, the potential environmental risks of the nanomaterial application in soil remediation are highlighted. Moreover, this review provides insight into the combination of nanoremediation with other remediation technologies. The study demonstrates that nZVI had been widely studied for high-efficiency environmental remediation due to its high reactivity and excellent contaminant immobilization capability. CNTs have received more attention for remediation of organic and inorganic contaminants because of their unique adsorption characteristics. Environmental remediations using metal and MNPs are also favorable due to their facile magnetic separation and unique metal-ion adsorption. The modified nZVI showed less toxicity towards soil bacteria than bare nZVI; thus, modifying or coating nZVI could reduce its ecotoxicity. The combination of nanoremediation with other remediation technology is shown to be a valuable soil remediation technique as the synergetic effects may increase the sustainability of the applied process towards green technology for soil remediation.

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Combining nanoscale zero-valent iron with electrokinetic treatment for remediation of chlorinated ethenes and promoting biodegradation: A long-term field study

Cited by 37 publications

References 62 publications

In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities

In situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities

Effects of in situ Remediation With Nanoscale Zero Valence Iron on the Physicochemical Conditions and Bacterial Communities of Groundwater Contaminated With Arsenic

Recent Advances of Nanoremediation Technologies for Soil and Groundwater Remediation: A Review

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