Pulsed electrokinetic removal of Cd and Zn from fine-grained soil
- Pulsed electrokinetic removal of Cd and Zn from fine-grained soil
- Byung-Gon Ryu; 양중석; Do-Hyung Kim; Kitae Baek
- pluse frequency; pulse ratio; electrical energy consumption; heavy metal removal
- Issue Date
- Journal of applied electrochemistry
- VOL 40, NO 6, 1039-1047
- Pulsed electrokinetics studies were carried out
to optimize the removal of Zn and Cd from fine-grained
soils and to observe the effects of varying the pulse frequency,
pulse time ratio (on/off), and DC voltage gradient.
Existing forms of heavy metals in the soil matrix were
determined using a sequential extraction method. The
strongly bound fraction (bound to organic matter and
residuals) that is difficult to remove from the soil matrix
comprised 74 and 62% of the total Zn and Cd, respectively.
In the electrokinetic remediation experiments, MgSO4 was
employed to increase the ionic strength of the soil for
2 weeks. Transportation of heavy metals was influenced by
the frequency, pulse ratio, and the voltage gradient of the
pulsed electric field. Extraction efficiency of Zn and Cd
near the anode was correlated positively with the voltage
gradient at a given pulse and ratio. A high pulse frequency
(1,800 cycles/h) enhanced the removal efficiency of the
heavy metals compared to a low pulse frequency
(1,200 cycles/h) at a supplied voltage gradient of 1 V/cm.
Although pulsed electrokinetics was more effective in
extracting and desorbing ions near the anode than conventional
electrokinetics, its ability to transport heavy
metals from the anode to the cathode was relatively small.
Total removals with pulsed electrokinetics were 21–31%
for Zn and 18–24% for Cd. In summary, pulsed electrokinetics
can enhance removal efficiency of heavy metals
and is beneficial with regard to electrical energy
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