浸没式超滤海水预处理工艺.pdf

化
进展
2015年第34卷第10期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
研究开发
浸没式超濾海水预处理工艺
李晓伟',解利听,孙晨,孙磊2,戴海平
(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30002:2天津膜天膜科技股份有限
公同,天津300042)
摘要:目前渤海湾反渗逶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SDI1s<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潓膜表面滤饼层疏松多孔,膜孔孔径变化較小,超滤膜比通量的
衰减速度减缓,反洗时超滤膜比通璗恢复率较高
关键词:渤海湾;预处理;超滤;混凝;污染
中图分类号:P7471.5
文献标志码:A
文章编号:1000-6613(2015)10-3795-05
DOI:10.1608511Ssn.1000-6613.2015.10.042
Seawater pretreatment with submerged ultrafiltration
LI Xiaowei, XIE Lixin, SUN Chen, SUN Lei, DAI Haiping
(School of Chemical Engineering and Technology, Tianjin University, Tianjin Key Laboratory of Membrane Science
and Desalination Technology, Tianjin 300072, China; Tanjin Motimo Membrane Technology Co, Ltd, Tianjin 300042
China)
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 Sdlis; 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
收稿日期:2015-04-02;修改稿日期:2015-05-04。
联系人:解利听,研究员,主要从事海水淡化技术及相关领域研
基金项目:国家科技支撑计划(2013BABO8B01)。
究。E-mailxie_iin@iu.edu.cn
第一作者;李晓伟(1989-),男,硕士研究生,研究方向为水处理。