Chemical pretreatment of feed water for membrane distillation |
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Authors: | Marek Gryta |
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Institution: | (1) Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pułaskiego 10, 70-322 Szczecin, Poland |
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Abstract: | Membrane distillation was used to produce demineralized water from ground water. The influence of feed water pretreatment
carried out in a contact clarifier (softening with Ca(OH)2 and coagulation with FeSO4 · 7H2O) followed by filtration, on the process effectiveness was evaluated. It was found that the chemical pretreatment decreased
the membrane fouling; however, the degree of water purification was insufficient because precipitation of small amounts of
deposit on the membrane surface during the process operation was still observed. The permeate flux was gradually decreasing
as a result of scaling. The morphology and composition of the fouling layer were studied using scanning electron microscopy
coupled with energy dispersion spectrometry. The presence of significant amounts of silica, apart from calcium and magnesium,
was determined in the formed deposit. The removal of foulants by heterogeneous crystallization performed inside the filter
(70 mesh), assembled directly at the module inlet, was found to be a solution preventing the membrane scaling.
Presented at the 34th International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 21–25 May
2007. |
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Keywords: | membrane distillation fouling scaling water pretreatment |
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