采用不同的预处理方式和配置人工无镁海水的方法，研究了不同海水体系中钙、镁离子对反渗透膜有机污染的影响。实验结果表明：脱硬预处理的方式可以有效减缓反渗透膜通量的衰减速度。当海水中存在一定浓度的腐殖酸时，与脱硬预处理的海水相比，常规预处理海水的膜通量和脱盐率下降得更快，是因为海水中的硬度离子加重了反渗透膜的有机污染。当海水中硬度离子只有钙离子时，反渗透膜通量和脱盐率随着钙离子浓度的升高而降低，UV254截留率受腐殖酸-钙的络合影响，随着钙离子浓度升高而升高。
 

The effect of calcium and magnesium ions on organic fouling of reverse osmosis membrane is investigated by different pretreatment ways and preparing magnesium-free artificial seawater. The results show that flux decline of reverse osmosis membrane is effectively controlled by hardness removal pretreatment. Under one certain concentration of humic acid(HA), the conventional pretreatment may lead to a rapid decrease of membrane flux and salt rejection compared with hardness removal pretreatment because hardness ions in seawater accelerate organic fouling of reverse osmosis membrane. The reverse osmosis membrane flux and salt rejection decreased with increasing of calcium concentration in magnesium-free artificial seawater, and due to the complexation of calcium ion with humic acid, UV254 rejection increased with increasing of calcium concentration.
 

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