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Journal of Applied Electrochemistry

, Volume 12, Issue 1, pp 59–67 | Cite as

Application of the trickle tower to problems of pollution control. I. The scavenging of metal ions

  • S. Ehdaie
  • M. Fleischmann
  • R. E. W. Jansson
Papers

Abstract

The theory of metal deposition in a bipolar trickle tower is reviewed briefly and applied to the scavenging of copper, silver, lead and calcium from dilute streams. Measurements of reference potential and mass-transfer coefficients for the copper system in one tower allow estimates ofθL, the fractional active length, to be made and subsequently allow data from different towers to be collapsed into a universal plot, thus substantiating the theory at least to a first approximation. In the co-deposition of copper, lead and cadmium, the data for copper and lead can be collapsed, but for cadmium cannot, probably because cadmium's reference potential is very negative under the conditions of the experiments. A scaling law is proposed which can be used in the design of practical systems.

Keywords

Calcium Copper Physical Chemistry Cadmium Metal Deposition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

a

length of one bipolar element (cm)

c

concentration (mol cm−3)

c0

initial concentration (mol cm−3)

Ci

inlet concentration (mol cm−3)

co

outlet concentration (mol cm−3)

ct

concentration in reservoir (mol cm−3)

F

the Faraday (C mol−1)

h

thickness of falling electrolyte film (cm)

K

mass transfer coefficient (cm s−1)

L

wetted perimeter per layer of elements (cm)

m

=Fρkc/h (V cm−2)

p

numbers of elements in tower

t

time (s)

u

velocity of film (cm s−1)

vo

volumetric flow rate (cm3 s−1)

V

inventory (cm3)

x

distance along length of element (cm)

φ

potential

ρ

resistivity of solution (Ω cm)

θL

fractional active length

Subscripts

M

solid phase

s

solution phase

i

inlet

o

outlet

Superscripts

o

initial

R

reversible

T

total (across one element)

( )°

reference state

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References

  1. [1]
    T. K. L. Tennekoon, PhD thesis, Southampton University (1972).Google Scholar
  2. [2]
    A. V. Bousoulengas, PhD thesis, Southampton University (1977).Google Scholar
  3. [3]
    S. Ehdaie, PhD thesis, Southampton University (1978).Google Scholar
  4. [4]
    M. Fleischmann and R. E. W. Jansson,71st Annual Meeting of the AIChE, Miami Beach, 12–16 November 1978. paper 696.Google Scholar
  5. [5]
    M. Fleischmann and Z. Ibrisagic,J. Appl. Electrochem. 10 (1980) 157.Google Scholar
  6. [6]
    E. A. El-Ghaoui, PhD thesis, Southampton University (1980).Google Scholar
  7. [7]
    M. Fleischmann and R. E. W. Jansson,Chem. Ingnr. Techn. 49(4) (1977) 283.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1982

Authors and Affiliations

  • S. Ehdaie
    • 1
  • M. Fleischmann
    • 1
  • R. E. W. Jansson
    • 1
  1. 1.Chemistry DepartmentSouthampton UniversitySouthamptonUK

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