Relevant design parameters for a reactor used in P removal with ZVI-based materials

Lanet, Pauline; Deluchat, Véronique; Baudu, Michel

doi:10.1016/j.jiec.2021.08.005

Cited by 19 publications

(6 citation statements)

References 138 publications

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“…Since the adsorption isotherms are capable of characterizing the interactions and adsorption mechanisms, 61 we employed the adsorption isothermal model to comprehensively investigate the adsorption process of Cr(VI) by SAZVIs. As illustrated in Figure S8a−c, the Langmuir model demonstrated a superior fit to the adsorption of Cr(VI) by SAZVI when compared to that of the Freundlich model.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Lin

Zhu

et al. 2023

Langmuir

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Amorphous zerovalent iron (AZVI) has gained considerable attention due to its remarkable reactivity, but there is limited research on sulfidated amorphous zerovalent iron (SAZVI) and the influence of different sulfur precursors on its reactivity remains unclear. In this study, SAZVI materials with an amorphous structure were synthesized using various sulfur precursors, resulting in significantly increased specific surface area and hydrophobicity compared to AZVI. The Cr(VI) removal efficiency of SAZVI-Na2S, which exhibited the most negative free corrosion potential (−0.82 V) and strongest electron transfer ability, was up to 8.5 times higher than that of AZVI. Correlation analysis revealed that the water contact angle (r = 0.87), free corrosion potential (r = −0.92), and surface Fe(II) proportion (r = 0.98) of the SAZVI samples played crucial roles in Cr(VI) removal. Furthermore, the enhanced elimination ability of SAZVI-Na2S was analyzed, primarily attributed to the adsorption of Cr(VI) by the FeS x shell, followed by the rapid release of internal electrons to reduce Cr(VI) to Cr(III). This process ultimately led to the precipitation of FeCr2O4 and Cr2S3 on the surface of SAZVI-Na2S, resulting in their removal from the water. This study provides insights into the influence of sulfur precursors on the reactivity of SAZVI and offers a new strategy for designing highly active AZVI for efficient Cr(VI) removal.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Lin

Zhu

et al. 2023

Langmuir

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“…Low COD content may cause nutrient removal failure as the removal of N and P requires a high amount of COD to incorporate them in the metabolisms [50]. The improvement that occurred in the presence of ZVI can cause the optimization of the removal by the presence of the ZVI-P binding process [72] and upregulation of the related genes in the related microbial in the system that enhanced the nutrient removal and metabolism activity for stabilization of the removal of nutrients [73,74]. Apart from that, the TS and TVS removals that increased in the combination of ZVI with alkaline and heat pretreatment were in line with the N and P removals (Figure 3c).…”

Section: Nutrient Removalsmentioning

confidence: 99%

Combination of Alkaline and Heat Pretreatments with Zero-Valent Iron Application in Cassava Pulp and Wastewater for Methane Generation: Development from Batch to Continuous Systems

et al. 2023

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Pretreatment with the addition of metals to anaerobic digestion in biogas production is crucial to address improper degradation of organic compounds with low methane production. Biogas production from a combination of cassava pulp and cassava wastewater in the batch system under the variation of alkaline and heat conditions as a pretreatment was investigated with the zero-valent iron (ZVI) addition after the pretreatment. It was found that alkaline pretreatment at pH 10 with the heat at 100 °C for 30 min combined with 50 g of ZVI kg of TVS−1 showed the highest methane production up to 4.18 m3 CH4 kg TVS−1. Nevertheless, chemical oxygen demand (COD) and volatile fatty acid (VFA) removals were slightly reduced when ZVI was added to the system. Furthermore, application in the continuous system showed increased COD and VFA removals after applying alkaline and heat pretreatments. On the other hand, additional ZVI in the substrate after the pretreatments in the continuous system increased the methane production from 0.58 to 0.90 and 0.19 to 0.24 of CH4 m3 kg TVS−1 in 20 and 60 days of hydraulic retention times (HRTs), respectively. Thus, a suitable combination of alkaline and heat pretreatments with ZVI is essential for increasing methane production in batch and continuous systems.

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“…These applications have been discussed in earlier papers (Naseri et al, 2017;Antia, 2020, Huang et al, 2021a, thus, a detailed review is beyond the scope of the present paper. In summary, typical applications of Fe0-based remediation systems documented in literature include: i) decentralized safe drinking water provision in low-income settings (Huang et al, 2021b;Mueller et al, 2021), ii) industrial wastewater treatment systems (Li et al, 2019;Kulkarni et al, 2020), iii) recovery of heavy metals from industrial effluents (Vollprecht et al, 2018;Calabrò et al, 2021;Noubactep, 2021), iv) urban stormwater treatment (Rahman et al, 2013;Tian et al, 2019), v) treatment of drainage water from agroecosystems (Das et al, 2017;Lanet et al, 2021), vi) subsurface permeable reactive barriers (PRBs) for remediation of contaminated groundwater (Thakur et al, 2020;Njaramba et al, 2021, Wang et al, 2022, and vii) treatment of domestic wastewater (Wakatsuki et al, 1993;Latrach et al, 2018).…”

Section: The Chemistry Of the Fe0/h2o Systemmentioning

confidence: 99%

“…Fe 0 for Wastewater Treatment Fe 0 has been used for wastewater treatment for many decades (Obiri-Nyarko et al, 2014;Antia, 2020;Lanet et al, 2021). Applications encompass the recovery of important elements (Vollprecht et al, 2018;Vollprecht et al, 2020), and the treatment of wastewaters from domestic (Wakatsuki et al, 1993), industrial (Oldright et al, 1928;Gould, 1982;Vollprecht et al, 2020), and agricultural sources (Anderson, 1989;James et al, 1992;Erickson et al, 2007).…”

Section: Fe 0 For Drinking Water Provisionmentioning

confidence: 99%

“…In all these applications, FeCPs serve as contaminant scavengers and the systems are designed to produce enough scavengers. Again, no reaction stoichiometry is needed, and the major reason is that the long-term kinetics of iron corrosion in each individual case is not known (Lufingo et al, 2019;Ndé -Tchoup é et al, 2020;Lanet et al, 2021;Noubactep, 2022).…”

Section: Fe 0 For Drinking Water Provisionmentioning

confidence: 99%

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Metallic Iron for Environmental Remediation: The Fallacy of the Electron Efficiency Concept

Ndé-Tchoupé

Cao

et al. 2021

Front. Environ. Chem.

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The suitability of remediation systems using metallic iron (Fe0) has been extensively discussed during the past 3 decades. It has been established that aqueous Fe0 oxidative dissolution is not caused by the presence of any contaminant. Instead, the reductive transformation of contaminants is a consequence of Fe0 oxidation. Yet researchers are still maintaining that electrons from the metal body are involved in the process of contaminant reduction. According to the electron efficiency concept, electrons from Fe0 should be redistributed to: i) contaminants of concern (COCs), ii) natural reducing agents (e.g., H2O, O2), and/or iii) reducible co-contaminants (e.g. NO3-). The electron efficiency is defined as the fraction of electrons from Fe0 oxidation which is utilized for the reductive transformations of COCs. This concept is in frontal contradiction with the view that Fe0 is not directly involved in the process of contaminant reduction. This communication recalls the universality of the concept that reductive processes observed in remediation Fe0/H2O systems are mediated by primary (e.g., FeII, H/H2) and secondary (e.g., Fe3O4, green rusts) products of aqueous iron corrosion. The critical evaluation of the electron efficiency concept suggests that it should be abandoned. Instead, research efforts should be directed towards tackling the real challenges for the design of sustainable Fe0-based water treatment systems based on fundamental mechanisms of iron corrosion.

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Relevant design parameters for a reactor used in P removal with ZVI-based materials

Cited by 19 publications

References 138 publications

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Combination of Alkaline and Heat Pretreatments with Zero-Valent Iron Application in Cassava Pulp and Wastewater for Methane Generation: Development from Batch to Continuous Systems

Metallic Iron for Environmental Remediation: The Fallacy of the Electron Efficiency Concept

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