JINXin,WEIYi-xiong,LIUMeng-wen,et al.Size Distribution and Buoyancy Efficiency of Microbubble?flocs in Dissolved Air Flotation Process[J].China Water & Wastewater,2024,40(5):37-42.
Size Distribution and Buoyancy Efficiency of Microbubble?flocs in Dissolved Air Flotation Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第5期
Page:
37-42
Column:
Date of publication:
2024-03-01
- Abstract:
- This paper constructed a simulated floc dynamic observation system, explored the distribution of bubble size and bubble number under different floc size conditions, and revealed the binding characteristics of microbubbles and flocs based on the characteristics of dissolved air flotation process for treating montmorillonite and silica inorganic suspension, so as to investigate the influence of micro-characteristics of microbubble-flocs on flotation performance of dissolved air flotation process. The dosage of coagulant affected the size of the microbubble-flocs, and then change the air flotation treatment performance. Under the optimal dosage of coagulant, the size of the microbubble-flocs was mainly distributed in the range of 350-1 500 μm. Based on the size distribution of microbubble-flocs, the binding characteristics between simulated flocs (glass particles) with different sizes and microbubbles was explored. The size of the microbubbles adhered to the simulated flocs mainly distributed in the range of 100-300 μm, and the number of microbubbles attached to the flocs gradually decreased with the reaction time. However, the size of microbubbles gradually increased. According to the calculation of the buoyancy efficiency of the simulated flocs, the buoyancy efficiency of microbubble-flocs was inversely proportional to the floc size, and it increased first and then remained stable with the reaction time, which reached the maximum value in 30-40 minutes.
Last Update:
2024-03-01