Abstract
Improvement of cadmium ion electrochemical removal from dilute aqueous solutions in a spouted bed reactor was investigated. Enlargement of cathode surface area from 1,000 to 1,500 cm2 resulted in a decrease of nearly 30 % in both of the process time and the specific energy consumption. Application of a three-stage electrolysis process for a solution containing initial concentration of 270 ppm cadmium ion, resulted in the removal of 99.9 % cadmium ion in 135 min with the specific energy consumption of 2.29 kWh/kg, 23 % less than the value of a single-stage process. For a solution with cadmium ion initial concentration of 180 ppm, 99.9 % of cadmium ion was removed in 135.5 min by application of a two-stage electrolysis process, while the specific energy consumption was 2.82 kWh/kg, 30 % less than that of a single-stage process. For a solution with cadmium ion initial concentration of 90 ppm, 99.5 % of cadmium ion was removed in 100.2 min with the specific energy consumption of 3.78 kWh/kg in a single-stage electrolysis process.
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The authors are thankful to the Esfahan Regional Electric Company (EREC) for the financial assistance of 5,000$.
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List of symbols
- A
-
Area of electrode (m2)
- C
-
Reactant concentration in the bulk solution (mol/m3)
- C s
-
Reactant concentration on electrode surface (mol/m3)
- C cr
-
Critical reactant concentration (mol/m3)
- CE
-
Current efficiency or current yield (%)
- E cell
-
Cell voltage (V)
- F
-
Faraday constant (C/g equiv)
- i
-
Electrical current (A)
- i lim
-
Limiting current (A)
- ICE
-
Instantaneous current efficiency (%)
- k c
-
Correction factor (–)
- k m
-
Mass transfer coefficient (m/min)
- \( k_{\text{m}}^{{\prime }} \)
-
Corrected mass transfer coefficient (m/min)
- k r
-
Reaction rate constant (m/min)
- m
-
Moles of deposited metals (moles)
- M
-
Molecular mass (kg/moles)
- n
-
Number of electrons (–)
- q
-
Total amount of charges passed (C)
- SEC
-
Specific energy consumption (kWh/kg)
- t
-
Time (min)
- t cr
-
Critical time (min)
- t t
-
Transient time (min)
- T
-
Total time (min)
- V
-
Electrolyte volume (m3)
- X
-
Conversion percent (%)
- X cr
-
Critical conversion percent (%)
- α
-
The ratio of applied to initial limiting current (–)
- ν
-
Stoichiometric coefficient (–)
- τ
-
The time of specified conversion (min)
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Baghban, E., Mehrabani-Zeinabad, A. & Moheb, A. Improvement of cadmium ion electrochemical removal from dilute aqueous solutions by application of multi-stage electrolysis. Int. J. Environ. Sci. Technol. 11, 1591–1600 (2014). https://doi.org/10.1007/s13762-014-0579-y
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DOI: https://doi.org/10.1007/s13762-014-0579-y