反渗透海水淡化水的消毒稳定性

Disinfection stability of reverse osmosis desalinated seawater

采用次氯酸钙、二氧化氯和紫外线3种消毒方法对反渗透海水淡化水进行消毒,综合p H、总溶解性固体(TDS)、余氯、大肠杆菌数等指标研究了消毒剂量和水质随贮水时间的变化。结果表明,消毒剂最佳剂量分别为次氯酸钙5mg·L^(-1),二氧化氯1 mg·L^(-1),紫外线5 m J·cm-2。经次氯酸钙消毒后淡化水的p H和TDS逐渐升高,7 d后基本稳定;而二氧化氯消毒后淡化水的p H略有降低,6 d后基本不变,TDS变化则相反。紫外线消毒后p H和TDS几乎不变,但大肠杆菌容易复活,第7天检出浓度为18 CFU·L^(-1)。

Disinfection methods,including use of calcium hypochlorite,chlorine dioxide,and ultraviolet（ UV） radiation,were applied to investigate disinfection of reverse osmosis（ RO） desalinated water. The disinfectant dosages and time courses of the water quality indices,E. coli number,p H,total dissolved salts（ TDS）,and residual chlorine,were studied. The results show that the optimal dosages of calcium hypochlorite,chlorine dioxide,and UV radiation were approximately 5 mg·L^-1,1 mg·L^-1,and 5 m J·cm- 2,respectively. The p H and TDS of the RO desalinated water disinfected by calcium hypochlorite increased until the seventh day,whereas when chlorine dioxide was used,p H decreased until the sixth day,and vice versa for TDS. As for UV disinfection,the p H and TDS remained almost constant,nevertheless E. coli was prone to reactivation,and a concentration of 18 CFU·L^-1was detected on the 7th day.