进水水质对纳滤膜苦咸水软化的分离性能

发布时间：2018-03-22 19:07

本文选题：纳滤　切入点：分离　出处：《化工学报》2017年08期 　论文类型：期刊论文

【摘要】：针对黄淮地区苦咸水,构建了小试级别的纳滤膜法软化系统,并开展了包括pH、总溶解固体含盐量(TDS)和总有机碳(TOC)等进水水质对DL、DK型纳滤膜的软化分离实验。结果表明,pH为3~10、TDS为1317~5926 mg·L~(-1)和TOC为2.72~12.24 mg·L~(-1)的进水条件下,DL和DK纳滤膜比通量随pH的增加分别呈先上升后下降和缓慢下降的趋势,随进水TDS和TOC的增加呈整体下降趋势,而纳滤膜对硬度离子(Mg~(2+)和Ca~(2+))的截留率均呈明显的上升趋势。DL膜运行至267 h时,膜比通量下降幅度超过10%,进行化学清洗,酸洗后膜比通量恢复率达到85.05%,酸洗加碱洗后该值高达97.2%,结合扫描电子显微镜和原子力显微镜表征结果,可知化学清洗对膜面污染有较好的去除效果。
[Abstract]:Aiming at the brackish water in Huanghuai area, a small scale nanofiltration membrane softening system was constructed. The softening and separation experiments of DL- DK type nanofiltration membrane were carried out, including pH, total dissolved solid salt content (TDS) and total organic carbon (TOC). The results showed that the ratio of DL-DK and DK nanofiltration membrane to DK / DK nanofiltration membrane under influent water conditions was 131717 ~ 5926 mg / L ~ (-1) and TOC = 2.7212.24 mg / L ~ (-1) respectively. With the increase of pH, the volume increased first and then decreased and decreased slowly. With the increase of influent TDS and TOC, there was an overall downward trend, while the rejection rate of nanofiltration membrane to hardness ion (MGG ~ (2)) and Ca~(2 ~ (2)) showed an obvious upward trend. When the membrane was running for 267h, the specific flux of the membrane decreased by more than 10%, and the membrane was cleaned by chemical method. The recovery rate of membrane specific flux was 85.05 after acid washing and 97.2kum after pickling and alkali washing. Combined with the results of scanning electron microscope and atomic force microscope, it can be seen that chemical cleaning has a better removal effect on membrane surface fouling.
【作者单位】：河南师范大学环境学院黄淮水环境与污染防治教育部重点实验室河南省环境污染控制重点实验室;
【基金】：国家自然科学基金项目(21606074) 中国博士后科学基金项目(2016M592297) 河南省博士后基金项目(2015073)~~
【分类号】：TU991.26

【参考文献】