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Zongo I.,Institute Of Recherche En Science Appliquees Et Technologies Irsat Cnrst | Wethe J.,Laboratoire Of Recherche Eau | Merzouk B.,University of Abderrahmane Mira de Bejaia | Maiga A.H.,Laboratoire Of Recherche Eau | And 2 more authors.
European Journal of Scientific Research | Year: 2011

COD, turbidity and absorbance evolutions have been analyzed depending on current density, time of water treatment, metal concentration, and charge loaded. It's found that the treatment performance is dependent on these parameters until a maximum after that, no improvement of the treatment appears. Electrocoagulation process allows the treatment of 72-82% of COD for "station" effluent and 45-75% for "plant" effluent. It has been shown that charge loaded and dissolved metal concentrations are much more pertinent to represent the evolution of pollution parameters that the times scale. Turbidity is eliminated by this technique independent of the current density and the types of electrode. Color treatment yields abatement of 93-99% for all effluents and all current density. Iron electrodes allow hexavalent chromium elimination and about 70% of abatement is obtained with aluminum electrodes. A minimum value of 1 kWh m-3, energy consumption is obtained by estimation with the small current density. By increasing effluent conductivity and reducing electrode gap, energy consumption could be more reduced. © EuroJournals Publishing, Inc. 2011.

Igo S.W.,Institute Of Recherche En Science Appliquees Et Technologies Irsat Cnrst | Bathiebo D.J.,University of Ouagadougou | Palm K.,Institute Of Recherche En Science Appliquees Et Technologies Irsat Cnrst | N'Wuitcha K.,University of Lome | And 2 more authors.
Frontiers in Heat and Mass Transfer | Year: 2011

A combined heat and mass transfer in laminar forced convection flow in a rectangular venturi tube have been numerically simulated. A transformation has been used to transform the irregular profile of the venturi walls into a straight line. Transfers equations are solved using finite volume method, Gauss and Thomas algorithms. The influences of venturi effect, inlet Reynolds number and venturi diameter ratio on the heat and mass transfer are discussed in detail. Results presented as pressure gradient, Nusselt and Sherwood numbers profiles, velocity patterns and isotherms show that the throat play an important role on the heat an mass transfer in the venturi channel.

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