Enhanced electrokinetic (E/K) remediation on copper contaminated soil by CFW (carbonized foods waste)

Han, Jung-Geun; Hong, Ki-Kwon; Kim, Young-Woong; Lee, Jong‐Young

doi:10.1016/j.jhazmat.2009.12.065

Cited by 46 publications

(23 citation statements)

References 22 publications

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“…Because of the strong ionic concentration, the current density peaked within a few hours, and then, because the cations migrated toward the electrode, which caused a decrease in the ion concentration in porous water, the current gradually decreased. Han et al (2010) found similar phenomena. Gaseous oxygen (O 2 ) and hydrogen (H 2 ) bubbles, which are good insulators, covered the electrodes and reduced the electrical conductivity, which subsequently reduced the current (Virkutyte et al, 2002).…”

Section: Resultssupporting

confidence: 54%

Electrokinetic Recovery of Copper, Nickel, and Zinc from Wastewater Sludge: Effects of Electrical Potentials

Lei

Chen

Li³

et al. 2012

Environmental Engineering Science

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One of the main obstacles to the agricultural use of the sludge produced in wastewater treatment plants are heavy metals that have accumulated. Electrokinetic treatment can be used to remove these heavy metals, but the process is time consuming, sometimes lasting several days. In this study, the effects of different potential gradients were investigated. Electrokinetic experiments were conducted under constant potential gradients (1 V/ cm, 3 V/cm, and 5 V/cm) with a treatment time of 16 hours. Results showed that the most efficient removal of metals was achieved at a potential gradient of 5 V/cm. Average removal efficiencies of heavy metals were 30.29% for copper, 43.52% for nickel, and 33.38% for zinc. Accumulation of metals occurred at a distance of 7 cm from the anode at a potential gradient of 1 V/cm. Results of the sequential extraction and sludge pH profiles show that an acidic front generated at the anode reservoir flushed across the sludge chamber and that the higher potential gradient increased the migration velocity, which aided the dissociation and desorption of metals. Furthermore, the use of higher potential gradients made it possible to remove heavy metals from sludge cells in a shorter period of time.

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Section: Resultssupporting

confidence: 54%

Electrokinetic Recovery of Copper, Nickel, and Zinc from Wastewater Sludge: Effects of Electrical Potentials

Lei

Chen

Li³

et al. 2012

Environmental Engineering Science

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“…The substances, which immobilize the HMs, can be used in EKR removal experiment. Addition of these substances could reduce the precipitation and composite anion2324. Moreover it reduces the HMs exchange hindrance, if so, then the purpose of short processing time and increased concentration of HMs removal can be achieved.…”

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confidence: 99%

The application of homemade Neosinocalamus affinis AC in electrokinetic removal technology on heavy metal removal from the MSWI fly ash

Liu

Huang

et al. 2016

Sci Rep

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This present paper was focused on the manufacture of activated carbon (AC) and its application in the electrokinetic remediation (EKR) technology on removal of the heavy metals (HMs) from the municipal solid waste incineration fly ash. AC was produced from Neosinocalamus affinis (NF) by chemical activation with H3PO4 in N2 atmosphere, the effects of activation temperatures, soaking time and impregnation ratios on the adsorption capacity of AC on HMs were examined through equilibrium adsorption experiments. The AC produced under the condition of 450 °C of activation temperature, 10 h of soaking time and 1.5 of impregnation ration was applied in the EKR experiment. The addition of AC in the S3-region of the electrolyzer could effectively improve the removal efficiencies of HMs. The technical parameters of voltage gradient, processing time and proportion were further optimized in the coupled experiments, the maximum removal of Cu, Zn, Cd, and Pb was 84.93%, 69.61%, 79.57%, and 78.55% respectively obtained under the optimal operating conditions of 2 V/cm of voltage gradient, 8 d of processing time and 20% of proportion.

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“…The energy consumption is estimated by (Han et al ):

where P is power (kW h), I is current (A), and vol is the soil volume (m 3 ). The energy expenditure over time was estimated based on the average voltage and current during each model timestep.…”

Section: Methodsmentioning

confidence: 99%

Optimal Field Approaches for Electrokinetic In Situ Oxidation Remediation

Wu¹,

Reynolds²,

Fourie³

et al. 2012

Groundwater Monitoring Rem

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Numerical simulations were used to identify and evaluate optimum electrode configurations and approaches for electrokinetic in situ chemical oxidation (EK‐ISCO) remediation of low‐permeability sediments. A newly developed groundwater and EK flow and reactive transport numerical model was used to conduct two‐dimensional scenario simulations of the coverage of an injected oxidant, permanganate, and the oxidation of a typical organic contaminant (tetrachloroethene, PCE). For linear configurations of vertical electrodes, the spacing of same‐polarity electrodes is recommended to be about one‐third to one‐quarter of the anode–cathode spacing. Greater coverage could also be achieved by locating additional oxidant injection wells at the divergence of the electric field in linear electrode configurations. Horizontal electrodes allowed greater contact between the injected permanganate and PCE and resulted in faster degradation of PCE compared to vertical electrodes. Pulsed oxidant injection, closer electrode spacing, and electric field reversal also resulted in faster EK‐ISCO remediation.

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Enhanced electrokinetic (E/K) remediation on copper contaminated soil by CFW (carbonized foods waste)

Cited by 46 publications

References 22 publications

Electrokinetic Recovery of Copper, Nickel, and Zinc from Wastewater Sludge: Effects of Electrical Potentials

Electrokinetic Recovery of Copper, Nickel, and Zinc from Wastewater Sludge: Effects of Electrical Potentials

The application of homemade Neosinocalamus affinis AC in electrokinetic removal technology on heavy metal removal from the MSWI fly ash

Optimal Field Approaches for Electrokinetic In Situ Oxidation Remediation

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