西沙群岛雨水净化及水质特征分析

The purification of rainwater in Xisha Islands and analysis on the features of water quality

目的通过对西沙群岛雨水净化工艺流程调查和水质检测,分析西沙群岛的雨水水质特征。方法筛选关键水质指标,按照GB/T 5750-2006《生活饮用水标准检验方法》进行分析。结果西沙群岛雨水采用初期弃流→压力过滤→电絮凝→紫外线杀菌的净化工艺,适合西沙群岛自然环境,所检测的水质指标均符合GB 5749-2006《生活饮用水卫生标准》限值,但氯化物、钙、镁、硫酸盐、重碳酸盐低于GJB 1335-92《低矿化度饮用水矿化卫生标准》的适宜浓度范围。结论西沙群岛雨水应进行矿化处理后才可供人员长期饮用。

Objective To evaluate the features of the rainwater quality in Xisha islands through investigation of the rainwater purification proeess and analysis of water quality. Methods Key water quality criteria were chosen and used for water quality detection in aeeordanee with the（Standard Examination Methods for Drinking Water）） （ GB/T 5750-2006）. Results The purification of rainwater in Xisha took the following processes ： abandoning of the initial water----~ pressure filtration →electric flocculation→ultraviolet disinfecion, which was suitable to the natural environment of Xisha islands. The detected water quality criteria all conformed to the limits as specified in the《Standard Examination Methods for Drinking Water》 （GB/T 5750-2006）. Nevertheless, the levels of chloride, calcium, magnesium, vitriol and heavy carbonate were lower than the suitable concentration limits as specified in the《Hygienic Standards for Mineralization of Drinking Water with Low Mineral Levels （GJBI335-92）. Conclusion With mineralization, purified rainwater in Xisha could be used as drinking water for a prolonged time.