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Vacuum membrane distillation for desalination: Scaling phenomena of brackish water at elevated temperature by Y.S. Chang; B.S. Ooi; A.L. Ahmad; C.P. Leo; S.C. Low is a Engineering article available to read on EtoBox.

What is Vacuum membrane distillation for desalination: Scaling phenomena of brackish water at elevated temperature about?

Membrane fouling or scaling is one of the main operational problems plaguing membrane distillation (MD) process during desalination. Specifically, scaling by the inorganic compounds is a serious and also common problem in MD, particularly at high temperature. In lieu of this, the effects of temperature, inorganic compounds and the membrane matrix on the membrane fouling phenomena require further investigation. In this work, a commercial hydrophobic polypropylene (PP) hollow fibre membrane with a smaller pore size (0.1 μm) was performed for its scaling and wettability propensity under the elevated feed temperatures condition. Brackish water that contains inorganic compounds was used as feed. Based on the membrane fouling in the brackish water jar test study, it was found that the deposits on the membrane surface were predominantly magnesium hydroxide [Mg(OH) 2 ], magnesium silicates (MgSiO 3 ), magnesium sulphate (MgSO 4 ), silica (SiO 2 ), and organic matter traces. The critical temperature for the significant deposition of Mg-based foulants on the membrane surface is 333 K. In the VMD experiments with feed temperature of 333 K, the commercial PP hollow fibre with smaller pore size

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Author

Y.S. Chang; B.S. Ooi; A.L. Ahmad; C.P. Leo; S.C. Low

Published

2021

Language

EN

Field

Engineering (Physical Sciences)