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RESEARCH PAPERS

Intensification of Water Detoxification by Integrating Photocatalysis and Pervaporation

[+] Author and Article Information
G. Camera-Roda

Department of Chemical and Mining Engineering and Environmental Technologies, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italygiovanni.camera.roda@mail.ing.unibo.it

F. Santarelli

Department of Chemical and Mining Engineering and Environmental Technologies, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy

J. Sol. Energy Eng 129(1), 68-73 (Nov 16, 2005) (6 pages) doi:10.1115/1.2391204 History: Received July 11, 2005; Revised November 16, 2005

Many studies have been made on the possibility of increasing the efficiency of the photocatalytic detoxification of water streams, since for several practical applications the need for increasing the yield of the process is important. In the present work, the integration of photocatalysis with a membrane separation process is studied in order to analyze the possibility of enhancing the efficiency. It is experimentally shown that for the integrated process, the rate of disappearance of a model pollutant (4-chlorophenol) is highly improved. Then it is demonstrated that this “process intensification” takes place through synergetic mechanisms that are identified, discussed, and optimized.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematics of the experimental apparatus

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Figure 2

(a) Degradation of 4-CP% after 30h versus the photocatalyst concentration in the APR. (b) Kinetic constant versus the photocatalyst concentration in the APR.

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Figure 3

Concentration of 4-CP and of some intermediate compounds versus time

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Figure 4

Dimensionless (normalized) concentration profiles versus time in a pervaporation run

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Figure 5

Percentage of 4-CP removed versus time in an integrated process

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Figure 6

The rate of disappearance of 4-CP by photocatalysis versus the concentration of 4-CP

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Figure 7

Permeation rate in the system versus the total concentration of organic compounds

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Figure 8

A comparison of the behavior of the integrated processes in different cases

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Figure 9

Values of the intensification factor Ei of the integrated process versus R

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