Membrane Aeration Sleeve for Confined Bubble Scouring
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Solution Overview
Problem
Membrane filtration systems face inefficiencies due to clogged membrane pores, requiring frequent backwashing and increased transmembrane pressure, and existing aeration devices do not effectively confine gas bubbles for scouring, leading to suboptimal cleaning and space utilization.
Innovation Solution
An aeration device with a sleeve configuration that surrounds the membrane filtration module, featuring a gas inlet, aeration openings, and drain openings, which confines gas bubbles for effective scouring and efficient liquid drainage, reducing clogging and footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing aeration devices are used for backwashing, then gas bubbles are supplied to membranes, but gas bubbles are not effectively confined leading to suboptimal cleaning
Solution Approach 1:
The aeration device is segmented into distinct functional zones: a gas inlet chamber for gas supply, a confinement chamber with lateral walls to contain gas bubbles, and drainage regions. This segmentation allows gas bubbles to be confined and directed effectively onto the membrane surfaces, improving cleaning efficiency while maintaining manageable structural complexity through modular design
Solution Approach 2:
The lateral walls of the confinement chamber act as intermediary structures that mediate between the gas inlet and the membrane surfaces. These walls confine and direct the gas bubbles, ensuring they are effectively delivered to the membranes for scouring while preventing uncontrolled dispersion, thus resolving the contradiction between cleaning effectiveness and structural simplicity
2Productivity
If membrane surface area is increased by increasing packing density or tube length, then filtration efficiency improves, but system footprint increases
Solution Approach 1:
The invention utilizes vertical dimension by implementing a vertically oriented aeration device with a confinement chamber that extends along the membrane length. This vertical configuration allows gas bubbles to be distributed along the membrane surface in the vertical dimension, enabling effective cleaning of high-surface-area membrane bundles without requiring increased horizontal footprint, thus resolving the contradiction between filtration efficiency and space utilization
3Reliability
If frequent backwashing is performed to maintain filtration efficiency, then membrane flux is maintained, but transmembrane pressure increases and system productivity decreases
Solution Approach 1:
The invention employs pneumatic action by supplying pressurized gas through the gas inlet to the confinement chamber, which then directs gas bubbles onto the membrane surfaces for scouring. This pneumatic backwashing mechanism effectively removes accumulated impurities and restores membrane flux, reducing the frequency of intensive cleaning cycles and maintaining system productivity while ensuring reliable filtration efficiency
Solution Approach 2:
The aeration device implements periodic gas bubble release cycles, where gas is supplied intermittently to the confinement chamber to create scouring bursts on the membrane surfaces. This periodic action effectively removes fouling deposits without requiring continuous high-intensity backwashing, thereby maintaining filtration efficiency while minimizing disruption to system productivity
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
Enhances membrane cleaning efficiency by maintaining flux and reducing transmembrane pressure, while minimizing system size and environmental impact through effective gas bubble confinement and liquid management.
Implementation Method 1
Gas is supplied to the chamber and through the openings of the chamber to aerate the membrane module
Implementation Method 2
The liquid containing impurities and deposits from the membranes is then drained or flushed from the tank
Data Source
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AI summary
An aeration device configured to be fitted to a membrane filtration module having membranes mounted therein. The aeration device comprises a sleeve configured to at least partially surround the membrane filtration module. The sleeve has one end adapted to engage with the membrane filtration module and another end adapted to engage with a filtrate collection conduit or manifold.