Abatement of hydrated silica, arsenic, and coexisting ions from groundwater by electrocoagulation using iron electrodes

High-efficiency removal of As(iii) from groundwater using siderite as the iron source in the electrocoagulation process

“…These ndings demonstrate the effectiveness of the system in removing excessive arsenic from groundwater. Compared to the removal rate of 99.3% under laboratory conditions, there was a slight decrease in the removal efficiency in the eld application, which could be attributed to the lower initial concentration of arsenic in the actual groundwater and the inuence of other ions present in the groundwater, 57 such as phosphate and silicate ions. 42 Nevertheless, the system maintained a high level of arsenic removal from groundwater, demonstrating its ability to effectively remove arsenic from actual groundwater sources.…”

Formation of Arsenic Minerals in Aqueous Media During Electrocoagulation using Iron Electrodes

“…We also performed XRD analysis to characterize the solid phases of the residues for Sample 1 and Sample 2 after electrocoagulation with an iron electrode (Figure 6). As shown in Figure 6A, for the solid residue of Sample 1, diffraction lines associated with spinelloid, Mg 2 SiO 4 (31.02°, 34.75°, 35.18°, 37.83°, 37.92°, 38.58°, 41.23°, 42.73° 2θ), magnetite (41.38°, 43.31°, 50.44°, 57.44° 2θ), iron sodium oxide, FeNaO 2 (39.27°, 40.58°, 42.21° 2θ), scorodite, FeAsO 4 ⋅ 2H 2 O (19.78°, 25.58°, 26.85°, 32.54°, 35.34° 2θ), ferrihydrite, Fe 2 O 3 ⋅ 0.5H 2 O (19.62°, 30.41°, 35.13, 40.79° 2θ), [39,40] fayalite, Fe 2 SiO 4 (29.16°, 36.90°, 39.75°, 40.84°, 41.96°, 43.59° 2θ) [40] calcite, CaCO 3 (34.27°, 46.10°, 50.56° 2θ) and brownmillerite, Ca 2 Fe 2 O 5 (26.55°, 28.01°, 34.06°, 37.35°, 39.27°, 38.58° 2θ) were detected. For Sample 2, in addition to the minerals mentioned above, including spinelloid, magnetite, ferrihydrite, fayalite, and scorodite (15.3°, 27.99°, 33.05° 2θ), the goethite, FeOOH (34.8°, 42.73°, 50.56° 2θ) was identified as well (Figure 6B).…”

“…We also performed XRD analysis to characterize the solid phases of the residues for Sample 1 and Sample 2 after electrocoagulation with an iron electrode (Figure 6). As shown in Figure 6A, for the solid residue of Sample [39,40] fayalite, Fe 2 SiO 4 (29.16°, 36.90°, 39.75°, 40.84°, 41.96°, 43.59°2θ) [40] calcite, CaCO 3 (34.27°, 46.10°, 50.56°2θ) and brownmillerite, Ca 2 Fe 2 O 5 (26.55°, 28.01°, 34.06°, 37.35°, 39.27°, 38.58°2θ) were detected. For Sample 2, in addition to the minerals mentioned above, including spinelloid, magnetite, ferrihydrite, fayalite, and scorodite (15.3°, 27.99°, 33.05°2θ), the goethite, FeOOH (34.8°, 42.73°, 50.56°2 θ) was identified as well (Figure 6B).…”

Removal of arsenic in groundwater from western Anatolia, Turkey using an electrocoagulation reactor with different types of iron anodes

“…The operational cost of the Fe ball, scrap, and plate anodes was mostly lower than that for the literature studies with Al and Fe anodes. For instance, Valentín-Reyes et al. (2022) investigated the treatment of As from groundwater using a continuous flow EC process with iron plate anodes.…”