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.
Issue Section:
Research Papers
1.
Hincapié
, M.
, Maldonado
, M. I.
, Oller
, I.
, Gernjak
, W.
, Sánchez-Pérez
, J. A.
, Ballesteros
, M. M.
, and Malato
, S.
, 2005, “Solar Photocatalytic Degradation and Detoxification of EU Priority Substances
,” Catal. Today
0920-5861, 101
, pp. 203
–210
.2.
Malato
, S.
, Blanco
, J.
, Vidal
, A.
, Alarcón
, D.
, Maldonado
, M. I.
, Cáceres
, J.
, and Gerniak
, W.
, 2003, “Applied Studies in Solar Photocatalytic Detoxification: An Overview
,” Sol. Energy
0038-092X, 75
, pp. 329
–336
.3.
Blanco
, J.
, and Malato
, S.
, 2003, “Solar Detoxification
,” UNESCO, Paris.4.
Fujishima
, A.
, Hashimoto
, K.
, and Watanabe
, T.
, 1999, TiO2 Photocatalysis. Fundamentals and Applications
, BKC, Inc.
, Tokyo
.5.
Peng
, M.
, Vane
, L. M.
, and Liu
, S. X.
, 2003, “Recent Advances in VOCs Removal From Water by Pervaporation
,” J. Hazard. Mater.
0304-3894, 98
, pp. 69
–90
.6.
Urkiaga
, A.
, Bolaño
, N.
, and De Las Fuentes
, L.
, 2002, “Removal of Micropollutants in Aqueous Streams by Organophilic Pervaporation
,“ Desalination
0011-9164, 149
, pp. 55
–60
.7.
Liu
, Q. L.
, and Xiao
, J.
, 2004, “Silicalite-Filled Poly(Siloxane Imide) Membranes for Removal of VOCs From Water by Pervaporation
,” J. Membr. Sci.
0376-7388, 230
, pp. 121
–129
.8.
Lipnizki
, F.
, Field
, R. W.
, and Ten
, P. K.
, 1999, “Pervaporation-Based Hybrid Process: A Review of Process Design, Applications and Economics
,” J. Membr. Sci.
0376-7388, 153
, pp. 183
–210
.9.
Sanchez Marcano
, J. G.
, and Tsotsis
, T. T.
, 2002, Catalytic Membranes and Membrane Reactors
, Wiley-VCH
, New York
.10.
Paiva
, A. L.
, and Malcata
, F. X.
, 1997, “Does Thermodynamics Improve Processing When a Chemical Reaction is Integrated With Physical Separation in Binary Ideal Mixtures?
,” Chem. Eng. Sci.
0009-2509, 52
, pp. 449
–452
.11.
Paiva
, A. L.
, van Rossum
, D.
, and Malcata
, F. X.
, 1999, “Integrated Vs. Sequential Reaction and Separation: Contribution for a Global Analysis
,” Chem. Eng. Sci.
0009-2509, 54
, pp. 1825
–1836
.12.
Paiva
, A. L.
, and Malcata
, F. X.
, 2000, “Comparison of the Performance of Integrated and Sequential Reaction and Separation Units in Terms of Recovery of a Desired Product
,” Chem. Eng. Sci.
0009-2509, 55
, pp. 589
–599
.13.
Ollis
, D. F.
, 2003, “Integrating Photocatalysis and Membrane Technologies for Water Treatment
,” Ann. N.Y. Acad. Sci.
0077-8923, 984
, pp. 65
–84
.14.
Molinari
, R.
, Mungari
, M.
, Drioli
, E.
, Di Paola
, A.
, Loddo
, V.
, Palmisano
, L.
, and Schiavello
, M.
, 2000, “Study on a Photocatalytic Membrane Reactor for Water Purification
,” Catal. Today
0920-5861, 55
, pp. 71
–78
.15.
Molinari
, R.
, Grande
, C.
, Drioli
, E.
, Palmisano
, L.
, and Schiavello
, M.
, 2001, “Photocatalytic Membrane Reactors for Degradation of Organic Pollutants in Water
,” Catal. Today
0920-5861, 67
, pp. 273
–279
.16.
Molinari
, R.
, Borgese
, M.
, Drioli
, E.
, Palmisano
, L.
, and Schiavello
, M.
, 2002, “Hybrid Processes Coupling Photocatalysis and Membranes for Degradation of Organic Pollutants in Water
,” Catal. Today
0920-5861, 75
, pp. 77
–85
.17.
Molinari
, R.
, Palmisano
, L.
, Drioli
, E.
, and Schiavello
, M.
, 2002, “Studies on Various Reactor Configurations for Coupling Photocatalysis and Membrane Processes in Water Purification
,” J. Membr. Sci.
0376-7388, 206
, pp. 399
–415
.18.
Theurich
, J.
, Linder
, M.
, and Bahnemann
, D. W.
, 1996, “Photocatalytic Degradation of 4-Chlorophenol in Aerated Aqueous Titanium Dioxide Suspensions: A Kinetic and Mechanistic Study
,” Langmuir
0743-7463, 12
, pp. 6368
–6376
.19.
Stankiewicz
, A. I.
, and Moulin
, J. A.
, 2000, “Process Intensification: Transforming Chemical Engineering
,” Chem. Eng. Prog.
0360-7275, 96
, pp. 22
–34
.20.
Kobus
, A.
, Kuppinger
, F. F.
, Meier
, R.
, Düssel
, R.
, Tuchlenski
, A.
, and Nordhoff
, S.
, “Improvement of Conventional Unit Operations by Hybrid Separation Technologies—A Review of Industrial Applications
,” Proceeding of ECCE3
, 3rd European Congress of Chemical Engineering
, Nuremberg
, 26–28 June 2001.21.
Stankiewicz
, A.
, 2003, “Reactive Separations for Process Intensification: An Industrial Perspective
,” Chem. Eng. Process.
0255-2701, 42
, pp. 137
–144
.22.
Stafford
, U.
, Gray
, K. A.
, and Kamat
, P. V.
, 1997, “Photocatalytic Degradation of 4-Chlorophenol: The Effects of Varying TiO2 Concentration and Light Wavelength
,” J. Catal.
0021-9517, 167
, pp. 25
–32
.23.
Guillard
, C.
, Disdier
, J.
, Herrmann
, J. M.
, Lehaut
, C.
, Chopin
, T.
, Malato
, S.
, and Blanco
, J.
, 1999, “Comparison of Various Titania Samples of Industrial Origin in the Solar Photocatalytic Detoxification of Water Containing 4-Chlorophenol
,” Catal. Today
0920-5861, 54
, pp. 217
–228
.24.
Cabrera
, M. I.
, Alfano
, O. M.
, and Cassano
, A. E.
, 1996, “Absorption and Scattering Coefficients of Titanium Dioxide Particulate Suspensions in Water
,” J. Phys. Chem.
0022-3654, 100
, pp. 20043
–20050
.25.
Camera-Roda
, G.
, Santarelli
, F.
, and Martin
, C. A.
, 2005, “Design of Photocatalytic Reactors Made Easy by Considering the Photons as Immaterial Reactants
,” Sol. Energy
0038-092X, 79
, pp. 343
–352
.26.
Böddeker
, K. W.
, 1990, “Terminology in Pervaporation
,” J. Membr. Sci.
0376-7388, 51
, pp. 259
–272
.Copyright © 2007
by American Society of Mechanical Engineers
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