الفهرس 
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Abstract
The aim of the present work is to develop a multi rotating disc electrochemical reactor and catalytic reactor of high space time yield suitable for conducting catalytic and electrochemicalliquid-solid diffusion controlled reactions.
The performance of multi rotating disc electrochemical reactor in removing copper IOns from a synthetic waste water solution was examined under different operating conditions.
Before testing the performance of the multi rotating disc electrochemical reactor in copper deposition, the effect of surface roughness on the rate of mass transfer was first studied using a single rough rotating disc by measuring the limiting current of the cathodic reduction of K3Fe(CN)6 in a large excess ofNaOH.
Variables studied were:
1- Disc rotation speed.
2- Degree of surface roughness.
3- Distance between rotating discs within the multi disc cathode.
4- Physical properties of the solution (p, J.l and D).
The present study revealed the following results:
1. The mass transfer coefficient was found to increase with disc rotation speed.
2. The mass transfer coefficient was found to increase by increasing the degree of
roughness.
3. Mass transfer data were correlated using the method of dimensional analysis; for
the conditions 1253<Sc< 2778, 13584.7< Re < 108682 and
0.007142«e/d)<0.02857, the following overall mass transfer correlation was obtained:
Sh = 2.695 Scl/3 Reo 54 (e/d) 0.276
With an average deviation of ± 7.4%