Fluidized Adsorption Column Reflux for Continuous Sewage Treatment
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Solution Overview
Problem
Existing sewage treatment technologies face challenges in efficiently using small particle size adsorbents due to issues such as adsorbent loss, bed blockage, and reduced adsorption performance, particularly in fluidized bed reactors, which also increase operation and maintenance costs.
Innovation Solution
A fluidized adsorption device with a reflux system and filter components that allow continuous operation, including a movable filter screen and diversion-flushing components, to manage small particle adsorbents, preventing loss and enhancing adsorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If small particle size adsorbent is used in fixed-bed reactor, then adsorption performance is improved, but water pressure increases causing short flow and bed blockage
Solution Approach 1:
The patent applies fluidized bed technology to transform the static fixed-bed system into a dynamic fluidized system. Small particle adsorbents (0.1-2mm) are fluidized by upward water flow, maintaining suspension and preventing bed blockage while preserving high adsorption performance. The system dynamically adjusts flow rates to maintain optimal fluidization state.
Solution Approach 2:
The patent uses hydraulic principles to fluidize the adsorbent bed. Upward water flow through the bed suspends small particle adsorbents, preventing them from settling and causing blockage. The hydraulic flow rate is controlled to maintain fluidization without causing excessive pressure drop or short flow.
2Productivity
If fluidized bed reactor is used, then processing capacity is improved, but adsorbent loss occurs
Solution Approach 1:
The patent introduces a magnetic field as an intermediary to retain adsorbent particles. Magnetic adsorbents are used with external magnetic fields applied at the outlet to prevent particle escape while allowing treated water to pass through. This intermediary magnetic force solves the adsorbent loss problem in fluidized beds.
Solution Approach 2:
The patent uses magnetic adsorbent particles with uniform magnetic properties to ensure consistent response to magnetic fields. The homogeneous magnetic characteristics of all particles allow for predictable and effective retention in the magnetic field, preventing loss while maintaining fluidized state.
3Reliability
If large particle size adsorbent is used, then bed blockage is prevented, but specific surface area decreases reducing adsorption performance
Solution Approach 1:
The patent uses dynamic fluidization to keep small particle adsorbents (0.1-2mm) suspended in the water flow. This prevents them from settling and causing bed blockage, while maintaining their high specific surface area for effective adsorption. The dynamic state replaces the need for large particle size.
Solution Approach 2:
The patent applies hydraulic upward flow to counteract gravity on small particle adsorbents. The water flow velocity is optimized to suspend particles without causing them to escape, enabling use of fine particles with high surface area while preventing bed blockage through hydraulic support.
4Loss of substance
If external solid-liquid separation facilities are added, then adsorbent loss is prevented, but treatment process is prolonged and area is increased
Solution Approach 1:
The patent merges the adsorption function with the separation function in a single integrated system. Magnetic adsorbents perform both adsorption of pollutants and enable separation through magnetic field application at the outlet. This eliminates the need for separate sedimentation tanks or filters, reducing system complexity and footprint.
Solution Approach 2:
The patent uses a magnetic field as an intermediary to achieve separation within the adsorption reactor itself. The magnetic field selectively retains magnetic adsorbent particles while allowing treated water to pass, integrating separation functionality without adding external solid-liquid separation facilities.
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 device enables stable and efficient use of small particle adsorbents, maintaining high adsorption performance and capacity while reducing operation costs by preventing adsorbent loss and ensuring continuous operation.
Implementation Method 1
the adsorption method is a common and mature technical way, which is mainly used to remove trace pollutants, including decolorization, deodorization, removal of heavy metals, dissolved organic matter
Implementation Method 2
Fluidized bed reactor has many advantages, such as large processing capacity, good mixing effect, not easy to cause short flow and blockage
Data Source
AI summary
The application relates to a fluidized adsorption device and a fluidized adsorption method for sewage treatment. The fluidized adsorption device comprises a fluidized adsorption column and a reflux device, wherein the fluidized adsorption column is consisted of a water outlet area, a fluidized adsorption area and a water inlet area from top to bottom; the reflux device includes top, middle and bottom reflux ports, and related reflux tubes; and the top reflux port and the bottom reflux port are activated during adsorption, and the middle reflux port and the bottom reflux port are activated during adsorbent replacement, such that the fluidized adsorption column can run continuously.