RESEARCH ON ENHANCED COAGULATION TECHNOLOGY BASED ON DYNAMIC MIXING FOR WATERWORKS

DENG Boyuan; LIU Weiyuan; ZHU Hailong; TIAN Huaiyu; WANG Xuefeng; LI Weiying

doi:10.13205/j.hjgc.202408006

Volume 42 Issue 8

Aug. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(8): 43-50

DENG Boyuan, LIU Weiyuan, ZHU Hailong, TIAN Huaiyu, WANG Xuefeng, LI Weiying. RESEARCH ON ENHANCED COAGULATION TECHNOLOGY BASED ON DYNAMIC MIXING FOR WATERWORKS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 43-50. doi: 10.13205/j.hjgc.202408006

Citation:

DENG Boyuan, LIU Weiyuan, ZHU Hailong, TIAN Huaiyu, WANG Xuefeng, LI Weiying. RESEARCH ON ENHANCED COAGULATION TECHNOLOGY BASED ON DYNAMIC MIXING FOR WATERWORKS[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(8): 43-50. doi: 10.13205/j.hjgc.202408006

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RESEARCH ON ENHANCED COAGULATION TECHNOLOGY BASED ON DYNAMIC MIXING FOR WATERWORKS

doi: 10.13205/j.hjgc.202408006

1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Pudong Veolia Water Supply Co., Ltd., Shanghai 200126, China;
3. Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China

Received Date: 2023-07-27
Available Online: 2024-12-02

Abstract

Abstract

To explore the effect of dynamic mixing on strengthening coagulation and its influencing factors, a comparative test of the coagulation effect was carried out with the assistance of dynamic mixing, static mixing, and tube mixing pilot test equipment in a water supply plant. The results showed that the comprehensive flocculation effect was ranked as dynamic mixing>static mixing>tube mixing. The removal rates of turbidity and chroma of dynamic mixing could reach 91% and 95%, respectively. The floc form was large and dense, which was conducive to sedimentation. The floc of static mixing and tube mixing was relatively loose. The removal rate of COD_Mn and TOC by dynamic mixing and other mixing methods was only in a range of 20% to 35%. Dynamic mixing had a better treatment effect on low temperature and turbidity water at a lower PAC dosage (20 mg/L), and the turbidity removal rate can still reach 90%. The study on the influence of flow rate, speed, turbine angle, pipe-turbine diameter ratio, installation distance, and other factors on dynamic mixing showed that the application of the dynamic mixing method should be combined with a low speed and a short installation distance from the flocculation tank in the treatment of small flow rate, while the opposite is true for a large flow rate. It is recommended to choose a smaller turbine angle (30° to 45°), and the turbine diameter ratio has no significant influence on the coagulation effect.
- dynamic mixing,
- enhanced coagulation,
- static mixing,
- tube mixing,
- low temperature and low turbidity water

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References(19)

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