Annular Clarified Liquid Collection Mechanism for Dissolved Gas Flotation
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Solution Overview
Problem
Prior clarifying systems face issues with liquid stagnation, uneven clarified liquid collection, and reduced solid/liquid separation efficiency due to centralized collection methods and lack of modulable microbubble formation, leading to suboptimal removal of suspended substances.
Innovation Solution
A flotation system with an annular clarified liquid collection mechanism and a mixing chamber for adjusting gas supply, allowing for even collection and forming a modulable microbubble bed, combined with a reaction chamber for optimizing particle and polyelectrolyte mixing to enhance separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clarified liquid is collected from the basin central column, then collection is simplified, but high collecting speed back-entrains dissolved air and suspended solid substances
Solution Approach 1:
The patent segments the single centralized collection point into multiple collection outlets distributed along the basin circumference. This distributes the collection load, reduces local collection speed, and prevents back-entrainment while maintaining effective clarified liquid removal through the combined capacity of multiple outlets.
Solution Approach 2:
The patent transitions from a vertical centralized collection approach (single point at basin center) to a horizontal distributed collection approach (multiple outlets along the circumference). This dimensional shift redistributes the collection function across the basin perimeter, reducing localized flow velocity and eliminating the back-entrainment problem.
2Object-generated harmful factors
If clarified liquid is collected from the outer circumference of the basin, then back-entrainment is reduced, but there is much less air for holding solid particles suspended
Solution Approach 1:
The patent applies local quality by positioning collection outlets at specific locations along the basin circumference where clarified liquid accumulates but where sufficient dissolved air remains. This selective positioning optimizes the balance between preventing back-entrainment and maintaining adequate air for particle suspension.
Solution Approach 2:
By distributing collection outlets horizontally along the basin circumference rather than concentrating collection vertically at the center, the system accesses clarified liquid at multiple radial positions where different concentrations of dissolved air exist, thereby maintaining sufficient air for particle suspension while avoiding back-entrainment zones.
3Device complexity
If centralized collection is used, then device complexity is reduced, but liquid stagnation and shorting effects occur inside the basin
Solution Approach 1:
The patent divides the collection system into multiple segmented outlets distributed along the basin circumference. This segmentation creates multiple flow paths for clarified liquid, preventing stagnation and shorting effects by ensuring uniform liquid removal across the basin, thereby improving flow reliability without significantly increasing device complexity.
4Device complexity
If all influent water and chemicals flow directly into the flotation basin, then mixing chamber is eliminated, but a modulable microbubble bed cannot be formed
Solution Approach 1:
The patent implements preliminary action by providing a mixing chamber where influent water, chemicals, and recycled liquid are pre-mixed before entering the flotation basin. This preliminary mixing creates the conditions necessary for forming a modulable microbubble bed, which significantly enhances suspended solid substance removal yield, while the overall system remains relatively simple.
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
The system achieves even clarified liquid collection, eliminates stagnation, and significantly improves the removal yield of suspended substances by forming a modulable microbubble bed and optimizing particle separation, enabling higher particle concentration handling.
Implementation Method 1
a first inlet (8) supplied, from the inlet (11), with the liquid having solid suspended substances to be processed, whereas a second inlet (9) is supplied, in a preset rate, with the indirect liquid containing gas dissolved therein under pressure
Implementation Method 2
forming a modulable microbubble bed under the flotated layer
Implementation Method 3
system for continuously clarifying liquids having solid suspended substances by means of flotation with dissolved gas
Implementation Method 4
the flotated layer of solid substance, oils and/or greases and a portion of water contained therein
Implementation Method 5
reaction chamber (7) for mixing the particles and metering the polyelectrolyte
Implementation Method 6
said collection of the clarified liquid being carried out along a middle circumferential region of the basin... with a substantially even rate along the overall annular collection extension
Data Source
Figure 1
Figure 2
AI summary
A system (1) for continuously clarifying liquids having solid suspended substances by means of flotation with dissolved gas substantially comprises a flotation basin (2), a rotary scroll (5) on the top of the basin, in which system (1) the clarified material means comprise a perforated toroidal element (30) spaced from the bottom of the basin (2) at a distance from 1/10 to 5/6 of the height of the liquid in the basin or by perforated pillars, and arranged at a middle distance with respect to the outer diameter of the basin and/or the supplying of the pressurized material being performed partially in a direct manner and partially in an indirect manner with a mixing chamber (7) and by supplying them to said basin eccentrically with respect to the middle vertical axis (A) of the basin, and/or the flotated material removing scroll having a simplified construction, thereby improving the removal or stripping yield of the suspended solid substances and enhancing the flotated layer outlet speed.