HECai-chang,ZHULi,CHAIZi-fei.Application of Coagulation Inclined Plate Sedimentation Tank and V-type Filter in Super?scale Seawater Desalination Project[J].China Water & Wastewater,2023,39(8):97-102.
Application of Coagulation Inclined Plate Sedimentation Tank and V-type Filter in Super?scale Seawater Desalination Project
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第8期
Page:
97-102
Column:
Date of publication:
2023-04-17
- Abstract:
- The scale of coagulation inclined plate sedimentation tank and V-type filter belonged to the pretreatment system of a super-scale seawater desalination phase I project (25×104 m3/d) is 7.5×104 m3/d and 2.5×104 m3/d, respectively. In the design, the method of multi-stage water distribution accompanied by hydraulic simulation flow field analysis was adopted to solve the problem of uneven water distribution affecting the operational performance of a single unit belonged to a large-scale process. In addition, in view of the characteristics of seawater with high salinity, high density, high viscosity and serious algae pollution, the project adopted the V-type inclined plate settling equipment with the advantages of secondary enhanced contact flocculation, small Reynolds number (Re), not easy to accumulate sludge and higher precipitation efficiency and the large particle size uniform graded coarse sand deep bed filter with large interception capacity, strong anti-fouling ability and long filtration period. The actual operation of the system was stable and reliable, and the effluent quality was excellent. Under different influent quality conditions, the effluent turbidity of coagulation sedimentation tank was always less than 5 NTU, the effluent turbidity of V-type filter was ≤0.1 NTU, and the backwashing cycle of V-type filter was 48 h, and all the indicators were better than the design requirements. The investment of the pretreatment system was approximately 180 million yuan, and the operational cost was 0.105 yuan/m3.
Last Update:
2023-04-17