Impact of dissolved oxygen and pH on the removal of selenium from water by iron electrocoagulation

Bae, Yeunook; Crompton, Nyssa; Sharma, Neha; Yuan, Yihang; Catalano, Jeffrey G.; Giammar, Daniel E.

doi:10.1016/j.watres.2022.118159

Cited by 22 publications

(4 citation statements)

References 56 publications

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“…Iron electrocoagulation is a suitable technology to treat this laundry greywater as the optimal pH range for iron electrocoagulation is typically between 6.0 and 8.0. Within this range, iron electrodes are most effective at generating iron hydroxide flocs, which facilitates the removal of contaminants 28 . The turbidity of the laundry greywater, measured at 218 NTU, falls within the range of 14 to 400 NTU for domestic laundry greywater as reported by Ref.…”

Section: Resultsmentioning

confidence: 99%

Optimization of iron electrocoagulation parameters for enhanced turbidity and chemical oxygen demand removal from laundry greywater

Tabash,

Elnakar,

Khan

2024

Sci Rep

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This study explores the optimization of iron electrocoagulation for treating laundry greywater, which accounts for up to 38% of domestic greywater. Characterized by high concentrations of surfactants, detergents, and suspended solids, laundry greywater presents complex challenges for treatment processes, posing significant environmental and health risks. Utilizing response surface methodology (RSM), this research developed a second-order polynomial regression model focused on key operational parameters such as the area-to-volume ratio (A/V), current density, electrolysis time, and settling time. Optimal treatment conditions were identified: an A/V ratio of 30 m2/m3, a current density of 10 mA/cm2, an electrolysis duration of 50 min, and a settlement period of 12 h. Under these conditions, exceptional treatment outcomes were achieved, with turbidity removal reaching 94.26% and COD removal at 99.64%. The model exhibited high effectiveness for turbidity removal, with an R2 value of 94.16%, and moderate effectiveness for COD removal, with an R2 value of 75.90%. The interaction between the A/V ratio and electrolysis time particularly underscored their critical role in electrocoagulation system design. Moreover, these results highlight the potential for optimizing electrocoagulation parameters to adapt to daily fluctuations in greywater production and meet specific household reuse needs, such as toilet flushing. This tailored approach aims to maximize contaminant separation and coagulant efficiency, balance energy use and operational costs, and contribute to sustainable water management.

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Section: Resultsmentioning

confidence: 99%

Optimization of iron electrocoagulation parameters for enhanced turbidity and chemical oxygen demand removal from laundry greywater

Tabash,

Elnakar,

Khan

2024

Sci Rep

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“…The solution was sparged with air or a mixture of pure nitrogen and air so that the initial DO concentrations were controlled to 8 mg L −1 , 6 mg L −1 and 4 mg L −1 , 36 respectively (corresponding to the water bodies of class I, class II and class IV, according to the environmental quality standards for surface water in China) ( n = 9). All DO concentrations in this study were determined three times and the average was taken, with CV (coefficient of variation) <15%.…”

Section: Resultsmentioning

confidence: 99%

Effects of dissolved oxygen on water quality and biofilms in the raw water distribution pipeline for a reserved water source

Shen

Ding

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…Green rust (GR) minerals are mixed-valent iron-layered double hydroxides (Fe(II)–Fe(III)-LDH) that are common in natural and engineered reducing geochemical systems such as flooded soils, groundwaters, corroding drinking water lines, permeable reactive barriers, and iron electrocoagulation water treatments. − GR is a layered mineral composed of octahedral brucitic Fe(OH) 2 sheets in which up to 1/3 of Fe(II) has been substituted by Fe(III) to generate a positive layer charge that is balanced by interlayer anions. ,,, Because of its high specific surface area and high content of structural ferrous Fe, GR is an effective reductant of a range of compounds including Cu(II), Hg(II), U(VI), Se(VI), and Cr(VI). ,,− …”

Section: Introductionmentioning

confidence: 99%

Dynamics and Mechanisms of Mn(II), Co(II), Ni(II), Zn(II), and Cd(II) Sorption onto Green Rust Sulfate

Badrealam

Elzinga

2023

Environ. Sci. Technol.

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Batch kinetic experiments are combined with X-ray absorption spectroscopy (XAS) to compare the sorption of Mn(II), Co(II), Ni(II), Zn(II), and Cd(II) with sulfated green rust (GR) in anoxic pre-equilibrated suspensions at pH 8 over a timespan of 1 h to 1 week. The XAS data suggest that all five divalent metals coordinate at Fe(II) sites of the GR sorbent, whereas the batch results show that GR exhibits bimodal sorption behavior, with fast but limited uptake of Mn(II) and Cd(II) and much more extensive sorption of Co(II), Ni(II), and Zn(II) that continues throughout the entire experimental timeframe. We attribute these observations to differences in the affinity and extent of divalent metal substitution in Fe(II) sites of the GR lattice as controlled by ionic size. Divalent metals smaller than Fe(II) [i.e., Co(II), Ni(II), and Zn(II)] are readily accommodated and undergo coprecipitation during GR dissolution−reprecipitation. In contrast, divalent metals larger than Fe(II) [i.e., Mn(II) and Cd(II)] have a low affinity for substitution and remain coordinated at the surface following limited exchange with Fe(II) (s) at GR particle edges. These results imply that GR may strongly affect the solubility of Co(II), Ni(II), and Zn(II) in reducing geochemical systems but will have little impact on the retention of Cd(II) and Mn(II).

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Impact of dissolved oxygen and pH on the removal of selenium from water by iron electrocoagulation

Cited by 22 publications

References 56 publications

Optimization of iron electrocoagulation parameters for enhanced turbidity and chemical oxygen demand removal from laundry greywater

Optimization of iron electrocoagulation parameters for enhanced turbidity and chemical oxygen demand removal from laundry greywater

Effects of dissolved oxygen on water quality and biofilms in the raw water distribution pipeline for a reserved water source

Dynamics and Mechanisms of Mn(II), Co(II), Ni(II), Zn(II), and Cd(II) Sorption onto Green Rust Sulfate

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