ADSORPTION CHARBON ACTIF THESES EN PDF

Kazraktilar Molecules are adsorbed and immobilized onto sites of different energies They do, however, have some interactions with other adsorbed molecules. The interactions between this solution and the solid were characterized by several methods: Langmuir and Freundlich parameters for the adsorption of the basicred dye on sawdust. The limiting step is the diffusion through a film at the start of the reaction, which is followed by the diffusion-adsorption into the porous structure in a region close to equilibrium. The linearized Clark equation 16 gives a good representation of experimental results fig. This modification depends on the nature and pressure of the gas used.

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Some investigators have attempted to simulate column performance with mathematical models and the aim of this work is to present the principal models and verify how the different models are applied to break-through curves ; parameters which can be evaluated by the different equations will also be compared. As early as BOHART and ADAMS presented differential equations which govern the dynamics of the adsorption of vapours and gases on fixed beds and the final result, applied to the liquid-solid phase, yields the kinetic adsorption rate k and the maximum adsorption capacity No eq.

By transposition to the liquid phase, we have calculated the concentration distribution in the bed eq. The activated carbon efficiency No can be estimated and the adsorption rate constant calculated from the slope and the y-intercept.

The model developed by CLARK is based on the use of e mass-transfer concept in combination with the Freundlich isotherm fig. The general equation is equation Two parameters A and r are determined by regression equations ; we proposed a simple method to calculate A and r by a linearization of the preceding equation eq.

The linear flow rates were 3. The Freundlich isotherm equation fig. The agreement is only for the low values of C in the break-through curves. The coefficients A and B table 1 are determined from the straight lines obtained with the low break-curve concentrations fig.

The kinetic coefficient Sa, and the maximum capacity adsorption No are shown in table 1. The No value is similar to those obtained from the other equations.

The linearized Clark equation 16 gives a good representation of experimental results fig. With the use of the two parameters, the break-through curves have been recalculated fig. Their is good agreement. B value can be determined with the different columns fig. From the difference in the area of the two curves, it is possible to calculate the supplementary biological degradation. The percentage is constant alter 35 cm depth of the activated carton in agreement with the electon microscopy study that showed that the flora was only present in the 10 first centimeters.

In conclusion, nome of the tested models lead to different parameters by using low break-through curve concentrations or others with the whole range of experimental points, but only one CLARK gives a good description of the break-through curves in our actual knowledge.

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Some investigators have attempted to simulate column performance with mathematical models and the aim of this work is to present the principal models and verify how the different models are applied to break-through curves ; parameters which can be evaluated by the different equations will also be compared. As early as BOHART and ADAMS presented differential equations which govern the dynamics of the adsorption of vapours and gases on fixed beds and the final result, applied to the liquid-solid phase, yields the kinetic adsorption rate k and the maximum adsorption capacity No eq. By transposition to the liquid phase, we have calculated the concentration distribution in the bed eq. The activated carbon efficiency No can be estimated and the adsorption rate constant calculated from the slope and the y-intercept.

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