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Received July 1, 2012
Accepted January 23, 2013
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Design of reverse osmosis networks for multiple freshwater production
Key Laboratory of Chemical and Biological Transforming Process, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, P. R. China 1College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China
Korean Journal of Chemical Engineering, May 2013, 30(5), 988-996(9), 10.1007/s11814-013-0009-8
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Abstract
Reverse osmosis (RO) desalination, which produces multiple freshwater from seawater, has been studied in this work. An optimization method based on process synthesis has been applied to design the RO system. First, a simplified superstructure that contains all the feasible design for this desalination problem has been presented. In this structural representation, the stream split ratios and the logical expressions of stream mixing were employed, which can make the mathematical model easy to handle. Then, the membrane separation units employing the spiral wound reverse osmosis elements were described by using a pressure vessel model, which takes into account the pressure drop and the concentration changes in the membrane channel. The optimum design problem can be formulated as a mixedinteger non-linear programming (MINLP) problem, which minimizes the total annualized cost of the RO system. The cost equation relating the capital and operating cost to the design variables, as well as the structural variables, has been introduced in the objective function. The problem solution includes the optimal streams distribution, the optimal system structure and the operating conditions. The design method could also be used for the optimal selection of membrane element type in each stage and the optimal number of membrane elements in each pressure vessel. The effectiveness_x000D_
of this design methodology has been demonstrated by solving a desalination case. The comparisons with common industrial approach indicated that the integrative RO system proposed in this work is more economical, which can lead to significant capital cost and energy saving and provide an economically attractive desalination scheme.
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Wade NM, Desalination, 136(1-3), 3 (2001)
Wilf M, Bartels C, Desalination, 173(1), 1 (2005)
Wilf M, Desalination, 113(2-3), 157 (1997)
Marcovecchio MG, Aguirre PA, Scenna NJ, Desalination, 184(1-3), 259 (2005)
Redondo JA, Casanas A, Desalination., 134, 134 (2001)
Busch M, Mickols WE, Desalination, 165(1-3), 299 (2004)
Lu YY, Hu YD, Xu DM, Wu LY, J. Membr. Sci., 282(1-2), 7 (2006)
Lu YY, Hu YD, Zhang XL, Wu LY, Liu QZ, J. Membr. Sci., 287(2), 219 (2007)
El-Azizi IM, Desalination., 153, 273 (2002)
Al-Enezi G, Fawzi N, Desalination., 153, 281 (2002)
El-Halwagi MM, AIChE J., 38, 1185 (1992)
Zhu MJ, Elhalwagi MM, Alahmad M, J. Membr. Sci., 129(2), 161 (1997)
Voros N, Maroulis ZB, Marinoskouris D, Comput. Chem. Eng., 20(S), 345 (1996)
Voros NG, Maroulis ZB, Marinoskouris D, J. Membr. Sci., 127(1), 47 (1997)
Maskan F, Wiley DE, Johnston LPM, Clements DJ, AIChE J., 46(5), 946 (2000)
Nemeth JE, Desalination, 118(1-3), 63 (1998)
Van der Meer WGJ, Averink CWA, Desalination., 105, 25 (1996)
van der Meer WGJ, Riemersma M, van Dijk JC, Desalination, 119(1-3), 57 (1998)
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