Membrane Filter Guide Member for Uniform Gas Bubble Scouring
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Solution Overview
Problem
Membrane fouling in flat sheet membrane systems leads to reduced water flow and membrane efficacy, requiring frequent replacement or cleaning, with existing scouring methods often leaving parts of the membrane surface untouched due to gas bubbles following the path of least resistance.
Innovation Solution
A membrane module assembly with guide members that direct gas bubbles along the membrane surface, using channels with open ends and diverting means to ensure even scouring across the entire membrane surface, potentially forming slug bubbles for enhanced cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas bubbles are used to scour the membrane surface, then membrane cleaning is achieved, but gas bubbles follow the path of least resistance and leave parts of the membrane surface unscoured
Solution Approach 1:
A guide member is introduced as an intermediary component between the gas bubble source and the membrane surface. The guide member includes channels that direct gas bubbles along the membrane surface, ensuring uniform distribution and contact across the entire membrane area, preventing bubbles from taking the path of least resistance
Solution Approach 2:
The guide member is divided into multiple channels that segment the gas flow into different paths. This segmentation ensures that gas bubbles are distributed across the entire membrane surface rather than concentrating in one area, achieving comprehensive coverage
2Reliability
If membrane filters are used to separate solids from liquids, then water treatment is achieved, but filter cake builds up on the membrane surface reducing flow and efficacy over time
Solution Approach 1:
Gas scouring is performed periodically as a preliminary cleaning action to remove filter cake buildup before it significantly reduces membrane performance. This prevents the progressive degradation that would otherwise require membrane replacement
Solution Approach 2:
The gas bubbles, which naturally rise and follow the path of least resistance, are converted into a beneficial cleaning mechanism by channeling them along the membrane surface. The upward motion of bubbles is utilized to scour and remove accumulated solids rather than being wasted
3Duration of action of stationary object
If an over-sized membrane filter is used to account for increasingly unusable membrane surface, then service time is extended, but system cost and complexity increase
Solution Approach 1:
The membrane filter system performs self-cleaning through gas bubble scouring, removing filter cake buildup and restoring membrane permeability. This extends the service life of the membrane without requiring oversized design margins or frequent replacements
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 solution ensures thorough scouring of the membrane surface, prolongs membrane effectiveness, reduces maintenance frequency, and minimizes operating costs by ensuring gas bubbles contact all areas, preventing debris accumulation and allowing for effective backwashing.
Implementation Method 1
membrane surface scouring or scrubbing using a gas in the form of bubbles in a liquid
Implementation Method 2
gas bubbles to flow over the membrane surface to release the caked solids back into suspension
Data Source
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AI summary
A guide member for directing gas bubble flow along a membrane surface, the guide member having first and second side edges defining a channel for gas bubbles to flow along, the channel having an open bottom end through which the gas bubbles can enter the channel and an open top end through which the bubbles can exit the channel, and a diverting means adjacent the channel bottom end arranged to direct at least some of the incident gas bubbles in a first direction towards the channel bottom end. A membrane module assembly and a membrane filter system including the guide member.