反渗透条件下粘土膜效率系数的试验研究

发布时间：2018-06-03 07:14

本文选题：粘土膜效率系数 + 盐运移模型　；参考：《高校地质学报》2017年02期

【摘要】：针对反渗透系统在给定流速和渗入端定浓度条件下的膜效率系数求解问题,提出利用粘土中盐运移模型的解析解计算膜效率系数的方法。通过设计反渗透试验,测定拟稳定状态下相关参数,利用盐运移模型的解析解,求得粘土膜效率系数,由此进一步讨论流速测定值的误差和拟稳定时长变化对膜效率系数影响。研究表明,重塑粘土膜效率系数为0.9010~0.9064,粘土的膜性能好,但120 d后计算的渗出浓度达到0.0998 mol·L~(-1),接近于渗入浓度0.1 mol·L~(-1),说明粘土膜拦截盐的能力随时间下降。此外,在拟稳定状态下的敏感性分析表明,流速在偏离试验设定条件的±10%范围内,对膜效应系数的影响不超过±1.25%,拟稳定时长变化对膜效应系数的影响不超过0.71%,说明计算方法可靠性高。
[Abstract]:In order to solve the problem of membrane efficiency coefficient of reverse osmosis system under the condition of given flow rate and fixed concentration of infiltration terminal, an analytical solution of salt migration model in clay is proposed to calculate the membrane efficiency coefficient. Through the design of reverse osmosis test, the relative parameters under quasi-stable state were measured, and the coefficient of clay membrane efficiency was obtained by using the analytical solution of salt migration model. The effect of the error of velocity measurement value and the variation of pseudo-stable time length on the membrane efficiency coefficient was discussed further. The results show that the efficiency coefficient of remolded clay membrane is 0.9010 ~ 0.9064, and the membrane performance of the clay is good, but the calculated exudation concentration reaches 0.0998 mol / L ~ (-1) after 120 days, which is close to the infiltration concentration of 0.1 mol / L ~ (-1), indicating that the ability of intercepting salt decreases with time. In addition, the sensitivity analysis under quasi-stable state shows that the velocity of flow is within 卤10% of the set conditions of the test. The effect on the membrane effect coefficient is not more than 卤1.25, and the effect of quasi-steady time variation on the membrane effect coefficient is not more than 0.71, which indicates that the calculation method has high reliability.
【作者单位】：南京大学地球科学与工程学院表生地球化学教育部重点实验室;河海大学地球科学与工程学院;南京水利科学研究院;
【基金】：国家自然科学基金(41372235) 国家重点研发计划重点专项课题(2016YFC0402807)联合资助
【分类号】：P642.1

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