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Design and field tests of a new membrane distillation desalination process

✍ Scribed by S.-I. Andersson; N. Kjellander; B. Rodesjö

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
339 KB
Volume
56
Category
Article
ISSN
0011-9164

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✦ Synopsis

Membrane distillation is a process in which, for example water in a heated salt solution, evaporates through a porous membrane. The vapor condenses on a coolant surface at the other side of the membrane. The two liquid streams, the salt solution and the condensate, are separated by a nonwettable (hydrofobic), highly porous membrane. Surface tension forces withhold liquids from the pores and prevent contact of the two liquids.

Theoretical research and verifying laboratory tests have resulted in a desalination module design. Trial production by injectionmoulding technique has been performed. Produced modules have been subject to field tests.

In this paper construction principles are shown and related to the theoretical and practical research. Test arrangements and conditions are described. Concluding features are presented. Performance data will be given as separate appendices.

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The design of the cassettes, the units forming a desalination module, is described in some detail. The stacking of the cassettes in a module is illustrated. A description is given of the field-test system. The measuring equipment and the test arrangements are described. Comparisons between the theo