الفهرس 
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Abstract
the present work is concemed with the enhancement of Cu++ions removal from synthetic wastewater
by cementation on a finned rotating zinc cylinder. The kinetics of the diffusion controlled Cu ++ mentation on a finned rotating cylinder were studied under different conditions such as:
i. Zinc cylinder rotational speed,
ii. Initial copper sulphate concentration,
ii. The effect of ratio offin height to cylinder diameter (e/d) and
v. The effect of the presence of drag reducing polymer.
le rate of Cu ++ cementation was expressed in tenns of mass transfer coefficient.
he study revealed the following results:
1) Effect of rotational speed: The mass transfer coefficient increases with increasing rotational speed.
2) Initial copper sulphate concentration: As the initial concentration of Cu+2 ions increases, the mass transfer coefficient increases.
3) Effect of (e/d) ratio: Mass transfer coefficient increases as (e/d) increases.
4) Correlation of the mass transfer yielded the following correlations:
• For smooth cylinder:
;. Sh = 0.95 ReO,65 Sc 0,33
In the range of: 1646 < Sc < 2262, 3126 < Re < 18176.
• For finned rotating cylinder:
}> Sh = 0.19 ReO,96 SCO,33(e/d)o27
In the range of: 1646 < Sc < 2262, 0.025 < (e/d) < 0.1, 3126 < Re< 18176.
These dimentionless mass transfer equations can be used for the design and operation of finned and smooth rotating cylinders reactors used to remove Cu++ from wastewater by cementation.
5) The effect offins is not velY effective at very low concentration.
6) The fins lead to enhancement the rate of mass transfer by 14.72 % to 89.9 % depending on e/d and rpm.
7) The maximum % Cu++ recovery was 97.7.
8) The presence of fins not only enhance the mass transfer rate but also control both nucleation and growth rate of copper deposit during cementation and resulted in a uniform size