CIESC Journal ›› 2020, Vol. 71 ›› Issue (S2): 289-296.DOI: 10.11949/0438-1157.20200325

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Ultrafiltration membrane cleaning technology and mechanism based on seawater desalination pilot equipment

Wenguang WANG1,2(),Ming TAN1,2(),Xiaohan SUN2,Xingtao YANG3,Xiaodong ZHANG3(),Yang ZHANG1,2(),Hongwu ZHAO3   

  1. 1.College of Environment and Safety Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, China
    2.Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China
    3.Qingdao Befesa Seawater Desalination Co. Ltd. , Qingdao 266043,Shandong, China
  • Received:2020-03-30 Revised:2020-04-07 Online:2020-11-06 Published:2020-11-06
  • Contact: Xiaodong ZHANG,Yang ZHANG

基于海水淡化中试的超滤膜清洗工艺及机理

王文广1,2(),谭明1,2(),孙小寒2,杨兴涛3,张晓东3(),张杨1,2(),赵洪武3   

  1. 1.青岛科技大学环境与安全工程学院,山东 青岛 266042
    2.中国科学院青岛生物能源与过程研究所,山东 青岛 266101
    3.青岛百发海水淡化有限公司,山东 青岛 266043
  • 通讯作者: 张晓东,张杨
  • 作者简介:王文广(1994—),男,硕士,研究助理,269530287@qq.com|谭明(1980—),男,副教授,tanming@qust.edu.cn
  • 基金资助:
    山东省重大科技创新工程项目(2018CXGC1005);国家自然科学基金项目(21878319);大连化学物理研究所与青岛能源所两所融合基金项目(DICP&QIBEBT UN201809)

Abstract:

In order to clean the ultrafiltration membrane in the process of seawater desalination, this paper studied the cleaning effects of backwash water and chemical agents on the ultrafiltration membrane by using the ultrafiltration pilot equipment. Effects of different backwash water on the transmembrane pressure difference were studied. The results showed that the cleaning effect was in the order of fresh water (tap water) > ultrafiltration water > reverse osmosis concentrated water. In addition, cleaning effect was as follows: citric acid > oxalate > hydrochloric acid > sodium hypochlorite > sodium hydroxide. Citric acid had the best cleaning effect, and the pure water penetration rate could be restored from 283.24 L/(m2·h) to 571.56 L/(m2·h). Moreover, the effect of alkali washing and acid washing together is better than that of cleaning alone. After cleaning with sodium hydroxide and then citric acid, the pure water transmission rate can recover from 283.24 L/(m2·h) to 818.81 L/(m2·h). The results of this study have a good application prospect for the maintenance of ultrafiltration membrane in seawater desalination.

Key words: membrane, ultrafiltration, separation, seawater desalination, pilot equipment

摘要:

为了对海水淡化过程中的超滤膜进行清洗,利用超滤中试设备研究了反洗水和清洗药剂对超滤膜清洗的效果。分别研究了不同的反洗用水对于跨膜压差的影响,结果表明,清洗效果:淡水(自来水)>超滤产水>反渗透浓水。另选用不同的酸性清洗剂与碱性清洗剂进行清洗,结果表明,清洗效果:柠檬酸>草酸>盐酸>次氯酸钠>氢氧化钠,柠檬酸清洗效果最好,纯水透过速率可从283.24 L/(m2·h)恢复至571.56 L/(m2·h)。此外,实验证明碱洗+酸洗效果优于单独清洗效果,先用氢氧化钠清洗,再用柠檬酸清洗,纯水透过速率可从283.24 L/(m2·h)恢复至818.81 L/(m2·h)。本研究成果对于海水淡化过程中超滤膜的维护具有较好的应用前景。

关键词: 膜, 超滤, 分离, 海水淡化, 中试

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