Electrokinetic Separation of Heavy Metals from Wastewater Treatment Sludge
- Electrokinetic Separation of Heavy Metals from Wastewater Treatment Sludge
- Seon-Young Park; Geun-Yong Park; Do-Hyung Kim; 양중석; Kitae Baek
- chelating ability; electrokinetic separation; processing fluid; sludge
- Issue Date
- Separation science and technology
- VOL 45, NO 12-13, 1982-1987
- In the study, a preliminary experiment on the removal of heavy
metals from industrial wastewater sludge was carried out to evaluate
the feasibility of electrokinetic separation. Four different types of
processing fluid—tap water, ethylenediaminetetraacetic acid
(EDTA), citric acid (CA), and 0.1M nitric acid—were tested.
EDTA was found to be the most effective agent within the set of
chemicals tested for removing heavy metals from sludge because
of its strong chelating ability with metals. The removal efficiency
of Pb and Cu was higher than that of Zn and Ni for all fluids. In
tap water, EDTA, and CA, the metals moved toward the anode,
implying that they existed as complexes with EDTA and CA or
organic matter in the processing fluid. In nitric acid, the metals
moved toward the cathode because nitric acid effectively desorbed
the metal from the sludge; however, the removal efficiency was very
low. The results indicated that electrokinetic technology effectively
separated Cu and Pb, but not Zn and Ni.
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