Study of reverse osmosis membranes fouling by inorganic salts and colloidal particles during seawater desalination

Fouling phenomenon is considered among the major reasons that cause significant increase of operating cost of desalination plants equipped with reverse osmosis (RO) membranes. This phenomenon is studied in the present work in the case of RO polyamide aromatic membranes using model seawater containin...

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Bibliographic Details
Published in:Chinese journal of chemical engineering 2020-03, Vol.28 (3), p.733-742
Main Authors: Gutiérrez Ruiz, Santiago, López-Ramírez, Juan Antonio, Hassani Zerrouk, Mohammed, Egea-Corbacho Lopera, Agata, Quiroga Alonso, José María
Format: Article
Language:English
Subjects:
Desalination
Fouling
Reverse osmosis
Scaling
Seawater
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Summary:Fouling phenomenon is considered among the major reasons that cause significant increase of operating cost of desalination plants equipped with reverse osmosis (RO) membranes. This phenomenon is studied in the present work in the case of RO polyamide aromatic membranes using model seawater containing inorganic salts and colloidal compounds. Different solubility conditions of CaCO3 and CaSO4 were applied to study RO performances with and without colloid presence. During experiments, the membrane permeate fluxes were continuously monitored. Moreover, studies of chemical composition, structure, and morphology of the materials deposited on the membrane surface were conducted using energy dispersive microanalysis (EDS) X-ray diffraction and scanning electronic microscopy (SEM). Results show that in conditions of calcium carbonate oversaturation there is a reduction in the permeate flow of 11.2% due to fouling of the membrane by the precipitation of this compound. While in the same conditions of calcium sulphate oversaturation the reduction of the flow is 5%, so we can conclude that in conditions of oversaturation of both salts, calcium carbonate produces a greater fouling of the membrane that in its view causes greater decrease in the flow of permeate. All this based on the results of the test with both salts in oversaturated conditions. Resulting in the formation of calcite and gypsum crystals onto the membranes as XRD analyses stated. Additional presence of colloidal silica in those conditions intensifies strongly the fouling, leading until to 24.1% of permeate flux decrease. [Display omitted] •Calcium carbonate in the feed flow yields to significant fouling phenomenon due to its precipitation.•Fouling due to calcium carbonate deposits becomes more significant when the solubility limit is exceeded.•Feed flows containing calcium sulphate, under supersaturating conditions, are needed for appreciable decline of permeability.•Colloidal silica with inorganic salts yields to severe fouling and decline in permeate flux due to crystals formation.
ISSN:1004-9541
2210-321X
DOI:10.1016/j.cjche.2019.10.004