化工进展 ›› 2015, Vol. 34 ›› Issue (10): 3795-3798,3808.DOI: 10.16085/j.issn.1000-6613.2015.10.042

• 资源与环境化工 • 上一篇    下一篇

浸没式超滤海水预处理工艺

李晓伟1, 解利昕1, 孙晨1, 孙磊2, 戴海平2   

  1. 1 天津大学化工学院, 天津市膜科学与海水淡化技术重点实验室, 天津 300072;
    2 天津膜天膜科技股份有限 公司, 天津 300042
  • 收稿日期:2015-04-02 修回日期:2015-05-04 出版日期:2015-10-05 发布日期:2015-10-05
  • 通讯作者: 解利昕,研究员,主要从事海水淡化技术及相关领域研究。E-mailxie_lixin@tju.edu.cn。
  • 作者简介:李晓伟(1989—),男,硕士研究生,研究方向为水处理。
  • 基金资助:

    国家科技支撑计划(2013BAB08B01)。

Seawater pretreatment with submerged ultrafiltration

LI Xiaowei1, XIE Lixin1, SUN Chen1, SUN Lei2, DAI Haiping2   

  1. 1 School of Chemical Engineering and Technology, Tianjin University, Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, China;
    2 Tianjin Motimo Membrane Technology Co., Ltd., Tianjin 300042, China
  • Received:2015-04-02 Revised:2015-05-04 Online:2015-10-05 Published:2015-10-05

摘要: 目前渤海湾反渗透海水淡化工程多采用新型的超滤膜法预处理工艺,为提高预处理效果,主要进行超滤膜材料和性能改进以及膜组件运行参数的优化,而对超滤膜前预处理的研究相对较少。本实验研究了超滤与混凝/超滤作为反渗透海水淡化预处理工艺的处理效果。考察了两种预处理工艺条件下浸没式超滤膜比通量(SF)、进水水质、产水水质,膜孔孔径变化、反洗效果及膜表面污染情况。结果表明,超滤与混凝/超滤两种预处理工艺都能达到产水SDI15<2.0;混凝处理可以大幅度降低海水中颗粒数目,降低颗粒物在膜表面沉积和吸附的概率,减轻超滤膜的污染。当采用混凝/超滤工艺时超滤膜表面滤饼层疏松多孔,膜孔孔径变化较小,超滤膜比通量的衰减速度减缓,反洗时超滤膜比通量恢复率较高。

关键词: 渤海湾, 预处理, 超滤, 混凝, 污染

Abstract: The ultrafiltration(UF) pretreatment process is widely employed in reverse osmosis desalination project at Bohai gulf. Most researches focus on the improvements of UF membrane material, performances and the operation optimization of membrane module. But the pretreatment of UF is not widely studied. This experiment studied the effects of pretreatment to seawater by direct ultrafiltration process and coagulation/UF process. The submerged UF membrane specific flow(SF), water quality, membrane pore size distribution, the recovery rate of membrane SF, and the pollution of membrane surface were investigated for these two technologies. The results showed that both processes could achieve less than 2.0 SDI15;the coagulation/UF process could significantly decrease the number of granules in seawater, thus reducing the probability of pollutants deposition and adsorption in membrane surface and improving the fouling extent of UF membrane. When the coagulation/UF process was adopted, the cake layer of membrane surface was more porous, the variation of membrane pore size distribution was insignificant, the attenuation of UF membrane SF was slowed, and the recovery rate of UF membrane SF was enhanced.

Key words: Bohai gulf, pretreatment, ultrafiltration, coagulation, pollution

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