The objective of this study was to investigate the influence of calcium ions(Ca
2+)on the fouling propensity of a thin-film composite reverse osmosis(RO)membrane by alginate. Under the experimental conditions investigated in this study, an increase in Ca
2+ of up to 0.2 mmol/L accelerated the fouling of the RO membrane. However, the fouling propensity was not influenced by concentrations of Ca
2+ above 0.2 mmol/L. This result could be explained by the content of Ca
2+ in the fouling layer, which increased when the concentration of Ca
2+ in the feed water was 0.25 mmol/L or less and reached a plateau above 0.25 mmol/L.
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