船舶反渗透法海水淡化水中提高镁离子浓度的探讨

Exploration on Increasing Concentration of Magnesium for Desalinated Water from Seawater by RO Process on Ships

饮用水中的镁离子对于预防心血管疾病具有重要作用,但反渗透法淡化水中缺乏镁离子。通过调查成人的镁摄入量和途径、船舶淡化水的矿化方法以及矿化相关标准等,从多角度分析船舶反渗透法淡化水的适宜镁离子浓度,并利用我国城市水质调查的结果进行验证。研究表明,基于船舶的舱室环境和保障条件,船舶中反渗透法淡化水的矿化镁浓度宜采用7~10 mg/L,这一结果与33%的调查城市的饮用水中镁离子浓度的范围一致。

Magnesium in drinking water plays an important role in prevention of cardiovascular diseases, while the effluent of RO desalination exhibits a deficiency of Mg. The appropriate Mg concentration in desalinated water from seawater by RO process on ships was considered in this paper from different aspects, including the amount and sources of Mg intake for adults, addition methods of Mg, and some relevant standards. The suggested concentration was then validated by the result of a survey of urban water quality covering 30 domestic cities. Based upon the environmental conditions of ships and the safety of drinking water quality, 7 ～ 10 mg/L was suggested as the appropriate range for concentration of Mg in the effluent of RO desalination, and this range coincided with the drinking water quality of 33% investigated domestic cities.