Abstract
Membrane crystallization (MCr) can be used to process highly concentrated aqueous solutions. In MCr, membrane distillation is used to recover water and to generate the desired supersaturation in a crystallizer tank where crystals can be precipitated. In this paper the stability and control of MCr process has been investigated. The experimental tests have been carried out on streams representing nanofi ltration and reverse osmosis retentate streams of the desalination plants. The deposition and accumulation of crystals on membrane surface and inside the membrane module has been prevented by recovering the produced crystals and by controlling the temperature of the solution flowing along the membrane module. The obtained almost constant trend of the trans-membrane flux has been the demonstration of the good carried out operations. The produced particles have been characterized in terms of shape, dimension, crystal size distribution (CSD), coeffi cient of variation (CV) and growth rate. The obtained CVs are ...
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