纳滤系统在矿井水零排放项目中分盐的应用
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摘要
针对矿井水零排放的迫切需求与矿区水资源短缺的现状,研究了某矿井水零排放项目纳滤分盐系统的运行情况.从调试到正常运行半年以来,该系统运行情况良好,超滤膜对COD的截留率达到70%,对硅的截留率在40%～70%之间,纳滤膜可以有效地将来水中的氯化钠与硫酸钠进行分离,产水侧NaCl/Na_2SO_4比达到55以上,浓水侧Na_2SO_4/NaCl比达到9以上,为后续蒸发结晶产出纯盐奠定基础.
In view of the urgent need for mine water zero discharge and the current situation of water shortage, the operation of the nanofiltration salt separation system of a mine water zero discharge project were studied. From the commissioning to the normal operation for half a year, the system ran well and could effectively separate the sodium chloride and sodium sulfate in the influent. The retention rate of COD by ultrafiltration membrane was 70%, and the rejection of silicon was between 40% and 70%. The ratio of NaCl/Na_2SO_4 on the produced water side was above 55, and the ratio of Na_2SO_4/NaCl on the concentrated water side was above 9, which laid a foundation for subsequent evaporation and crystallization of pure salt.
In view of the urgent need for mine water zero discharge and the current situation of water shortage, the operation of the nanofiltration salt separation system of a mine water zero discharge project were studied. From the commissioning to the normal operation for half a year, the system ran well and could effectively separate the sodium chloride and sodium sulfate in the influent. The retention rate of COD by ultrafiltration membrane was 70%, and the rejection of silicon was between 40% and 70%. The ratio of NaCl/Na_2SO_4 on the produced water side was above 55, and the ratio of Na_2SO_4/NaCl on the concentrated water side was above 9, which laid a foundation for subsequent evaporation and crystallization of pure salt.
引文
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[2] 曲风臣,吴晓峰,王敬贤.煤化工废水“近零排放”技术与应用[J].环境影响评价,2014,(6):8-12.
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[4] Petersen R J.Composite reverse osmosis and nanofiltration membranes[J].J Membr Sci,1993,83(1):81-150.
[5] Bowen W R,Mohammad A W,Halal N.Charaeterisation of naofiltration membrane for predietive pureposes-use of salts uneharged solutes and atomic force microseopy[J].J Membr Sci,1997,126(1):91-105.
[6] 张钦库,朱建领,刘康怀.膜分离技术处理百草枯生产废水实验研究[J].膜科学与技术,2014,34(4):94-98.
[7] 苗晶,陈国华,王铎,等.纳滤膜分离技术在工业废水处理中的应用[J].水处理技术,2005,31(7):1-6.
[8] 何毅,李光明,王华,等.纳滤膜分离技术在废水处理中的应用[J].工业水处理,2003,23(8):1-4.
[9] 韩洪晶,刘鑫.纳滤膜在化工废水处理中的实际应用[J].当代化工,2014,43(6):985-987.
[10] 刘继全,方建慧,邓英,等.超滤技术在反渗透海水淡化预处理中的应用[J].上海大学学报(自然科学版),2006,12(6):610-614.
[11] 张泉,郭曦,董文艺,等.预处理方式对纳滤工艺性能及膜污染影响研究[J].膜科学与技术,2014,34(1):82-86.
[12] 陈常荣,罗鹏安,汤水江.外压式超滤装置用于反渗透海水淡化预处理的效果[J].中国给水排水,2007,23(23) :101-103.
[13] 吴雅琴,杨波,申屠勋玉,等.膜集成技术在高含盐废水资源化中的应用[J],水处理技术,2016,42(7) :118-120.