Multibubble Injection DAF System for Floc Removal
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Solution Overview
Problem
Conventional DAF water treatment systems face inefficiencies in removing flocs due to insufficient contact between micro bubbles and flocs, as micro bubbles are primarily supplied to the contact zone, limiting the growth and removal of flocs in the separation zone.
Innovation Solution
A multibubble injection type DAF system that supplies micro bubbles not only to the contact zone but also to the separation zone, using nozzles and turbulence partitions to ensure flocs come into contact with micro bubbles, enhancing floc removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro bubbles are supplied only to the contact zone, then the structure is simple and operation is easy, but floc removal efficiency is insufficient because flocs cannot adequately contact micro bubbles in the separation zone
Solution Approach 1:
The flotation basin is divided into a contact zone and a separation zone, with micro bubble supply nozzles strategically positioned in both zones. This segmentation allows targeted bubble injection where needed: the contact zone for initial floc-bubble interaction and the separation zone for capturing remaining flocs, thereby improving overall removal efficiency without requiring a completely complex system redesign
Solution Approach 2:
Different regions of the flotation basin are provided with different qualities of micro bubble supply. The contact zone receives micro bubbles to initiate flocculation, while the separation zone also receives micro bubbles to ensure complete floc removal. This local differentiation of bubble supply quality and quantity optimizes the flotation process in each specific region according to its functional requirements
2Quantity of substance
If compressed air saturation is applied to all recycle flows, then bubble generation is maximized, but energy consumption increases and system complexity increases
Solution Approach 1:
Compressed air saturation is applied selectively to specific recycle flows that are directed to the micro bubble supply nozzles in both the contact zone and separation zone, rather than saturating all recycle flows uniformly. This localized application of air saturation maximizes bubble generation where it is most needed for floc removal while minimizing unnecessary energy consumption in other parts of the system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the removal of flocs, stabilizing the quality of treated water by ensuring all flocs, regardless of growth conditions, are effectively floated and removed, even under varying conditions such as temperature and coagulation intensity.
Implementation Method 1
The dissolved air flotation is a technology of putting a coagulant, an aid coagulant, a pH regulator and so on in feed water to be treated in order to coagulate suspended particles, which is difficult to be removed through precipitation, such as alga and organic compounds, contained in feed water, injecting micro bubbles into the coagulated matters to combine the micro bubbles with the suspended particles, and floating and removing the suspended particles
Implementation Method 2
separates some of treated water which is an end product by a pipe and supplies compressed air of 4 to 7 bars to saturate the treated water. So, a rapid drop of pressure occurs, and then, micro bubbles are supplied to the contact zone 2 through a nozzle 4 mounted at the lower part of the contact zone 2
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Disclosed herein is a multibubble injection type DAF (Dissolved Air Flotation) water treatment apparatus which supplies fine bubbles injected through injection of saturated water to a lower area of a separation zone (22) as well as a lower area of a contact zone (21) of a flotation basin, thereby improving removal efficiency of flocs.