Formation of macroscopic surface layers on Fe(0) electrocoagulation electrodes during an extended field trial of arsenic treatment

Genuchten, Case M. van; Bandaru, Siva; Surorova, Elena; Amrose, Susan; Gadgil, Ashok; Peña, J. Theodore

doi:10.1016/j.chemosphere.2016.03.027

Cited by 53 publications

(28 citation statements)

References 43 publications

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“…S1 and S2), our results support the hypothesis that field treatment performance decreases over time because EC generated Fe(II) is trapped at the anode by macroscopic Fe (oxyhydr)oxide surface layers (e.g. magnetite, goethite) formed on the electrode after extended operation [45].…”

Section: Insights Into Field Treatment Performance Over Timesupporting

confidence: 77%

“…periods of operation (wet) and storage (dry) [45,59]. One previously proposed explanation for this decreased field performance is a drop in Faradaic efficiency resulting from O 2 evolution after many cycles of operation.…”

Section: Insights Into Field Treatment Performance Over Timementioning

confidence: 99%

“…The electrochemical cell consisted of an Ag/ AgCl reference electrode and Fe(0) working and counter electrodes (spaced 2 cm apart). The trace metal composition of the Fe(0) electrodes used in our study was reported previously [45]. Before each experiment, the Fe(0) electrodes were cleaned and polished with fine grained sandpaper.…”

Section: Electrochemical Experimentsmentioning

confidence: 99%

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Factors affecting the Faradaic efficiency of Fe(0) electrocoagulation

Genuchten

Dalby

Ceccato

et al. 2017

Journal of Environmental Chemical Engineering

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(0) (0) (0) oxidation and O 2 evolution in the EC system. These molar ratios were supported by experiments in synthetic groundwater solutions. We also found that the E A vs i curves for solutions with poor Faradaic efficiency overlapped but were situated 2-4 V vs Ag/AgCl higher than those of solutions with high Faradaic efficiency. Therefore, the position of the E A vs i curve, rather than the E A alone, can be used to determine unambiguously the reaction occurring on the Fe(0) anode during EC treatment.

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Section: Insights Into Field Treatment Performance Over Timesupporting

confidence: 77%

Section: Insights Into Field Treatment Performance Over Timementioning

confidence: 99%

Section: Electrochemical Experimentsmentioning

confidence: 99%

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Factors affecting the Faradaic efficiency of Fe(0) electrocoagulation

Genuchten

Dalby

Ceccato

et al. 2017

Journal of Environmental Chemical Engineering

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“…According to the difference of reaction rate for various ferric hydrolysates with Ferron reagent, Fea represents ferric ions, monomeric hydroxy complex and ferric oligomer (e.g., Fe 3+ , [Fe(OH)] 2+ , [Fe(OH)2] + ), and Feb is a transition state between Fea and Fec, which is composed of polymeric hydroxy complex with low polymerization degree (e.g., [Fe2(OH)2] 4+ , [Fe13(OH)34] 5+ ). Fec corresponds to the ferric species with high polymerization degree and even ferric precipitation (e.g., Fe(OH)3 (am)) [12]. During the EC process of WFGD wastewater on Fe anode, the species of ferric hydrolysates dominate in form of low or medium polymerization state.…”

Section: Floc Speciation Change On Al Anodementioning

confidence: 99%

Speciation Change of Flocs During Electrocoagulation for Wet Flue Gas Desulfurization Wastewater

Zhou¹,

Yunbo²,

Liu³

et al. 2020

Rev. Chim.

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Wastewater produced from wet flue gas desulfurization (WFGD) process contains large amounts of suspended solids (SS), heavy metals and salinity. Compared to traditional chemical coagulation, electrocoagulation (EC) technology is a novel technology to remove these pollutants with lower O&M costs and simplified facilities. In order to achieve better EC effects, the speciation change of flocs generated from two kinds of sacrificed electrodes (e.g., Al and Fe) is investigated in various operation parameters. The results show that iron anode performed better compared to aluminium anode. At 20V of voltage and 6cm of electrode gap, the percentage of polymeric species of iron flocs can reach more than 50%. The significant domination of polymeric species under the optimal conditions during electrocoagution is responsible for the turbidity removal.

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“…The ancient use of Fe 0 for safe drinking water provision both at household (Bischof 1877(Bischof , 1878Baker 1934) and large scale (Devonshire 1890;Baker 1934; Van Craenenbroeck 1998) levels has been widely overseen . The redox complex geochemistry of iron (Table 1) (Liu and Millero 1999;Nesic 2007;Antia 2010;Noubactep 2010a, b, c;Luo et al 2013;Noubactep 2016b, c, d, e;van Genuchten et al 2016). The difference in the crystal structure of Fe 0 and generated corrosion products (Table 2) implies that the oxide scale is not primarily a protective one (Lazzari 2008;Noubactep 2010c).…”

Section: Introductionmentioning

confidence: 99%