Abstract：Due to the low mineral content and poor stability of reverse osmosis desalted water, the water quality should be improved by adding mineralizer. In order to know the optimum dosage of NaHCO3 and CaCl2, the relationship between the concentration of NaHCO3 and CaCl2 and Ryznar stability index,Calcium carbonate precipitation potential, Larson index and oxidation-reduction potential were studied. The results show that R.S.I. value decreases(approaches to 6~7) with the increase of the dosage of NaHCO3 from 50 to 90 mg·L－1, and then increases (deviation from the range of 6~7) with dosage of NaHCO3 from 90 to 110 mg·L－1, indicating that water stability becomes better and then becomes worse， respectively. CCPP value decreases with the increase of dosage of NaHCO3, when water quality stability changes from precipitation tendency to corrosion tendency. When the concentration of NaHCO3 is high than 70 mg·L－1, CCPP value levels off, so does the water stability. With the increase of the amount of NaHCO3, LR decreases and water stability gets better. With the increase of the amount of NaHCO3, ORP firstly decreases and then begins to level off when the amount of NaHCO3 reaches 90 mg·L－1, which means that the health of water increases firstly and then levels off. Therefore， the appropriate amount of NaHCO3 is 90 mg·L－1. R.S.I. and CCPP value decrease and water stability decreases with the increase of the dosage of CaCl2. LR value increases with the increase of the dosage of CaCl2, meaning that water stalibility becomes worse. With the increase of the amount of CaCl2, ORP increases，which means that the health of water decreases. Thus the appropriate amount of CaCl2 is approximately 20 mg·L－1 .
武云霞, 赵丹, 陈莎莎, 张平, 杨岳平. 反渗透淡化水调质稳定性及健康性实验研究[J]. 浙江大学学报（理学版）, 2020, 47(1): 101-106.
WU Yunxia, ZHAO Dan, CHEN Shasha, ZHANG Ping, YANG Yueping. Study on stability and health of mineralizerd reverse osmosis desalted permeat. Journal of ZheJIang University(Science Edition), 2020, 47(1): 101-106.
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