LUBiao,YANGZhi-feng,MAYan-qiang,et al.Process Design of a Whole-process Seawater Desalination Plant for Municipal Water Supply in Qingdao[J].China Water & Wastewater,2023,39(4):47-52.
Process Design of a Whole-process Seawater Desalination Plant for Municipal Water Supply in Qingdao
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第4期
Page:
47-52
Column:
Date of publication:
2023-02-17
- Keywords:
- seawater desalination; whole-process; high-speed air flotation; ultrafiltration; reverse osmosis; mineralized filter
- Abstract:
- The designed scale of a municipal seawater desalination project in Qingdao is 10×104 m3/d. The product water is planned to be connected to the municipal water supply network. The whole process consists of primary pretreatment (air flotation), secondary pretreatment (ultrafiltration), desalination (two-stage reverse osmosis) and post-treatment (mineralized filter). The surface load of the high-speed air flotation tank is 24.92 m3/(m2·h). The membrane flux of the ultrafiltration system is 41.4 L/(m2·h), and the recovery rate is not less than 92%. The design flux of the first stage reverse osmosis is 13.11 L/(m2·h), and the recovery rate is 45%. The design flux of the secondary stage reverse osmosis is 36.86 L/(m2·h), and the recovery rate is 90%. The water produced by reverse osmosis is then passed through the mineralized filter to increase its hardness, and the quality of the produced water stably meets the sanitary standard of drinking water. The investment of the project is estimated to be 744 million yuan, and the unit water cost is 4.86 yuan/m3, among which the variable cost is 2.92 yuan/m3.
Last Update:
2023-02-17