Separation Membrane Module Diagnosis Using Multi-Solute Test Water
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Solution Overview
Problem
Existing methods for diagnosing the cause of performance deterioration in separation membrane modules, such as reverse osmosis membranes, require disassembly and analysis of membrane pieces, which is time-consuming and delays countermeasures.
Innovation Solution
A state diagnosis method for separation membrane modules involves supplying test water with at least two types of solutes to the module, measuring the solute concentrations in the permeate water, and comparing the separation performance to determine abnormalities, their degree, and generation position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If disassembly and analysis of membrane pieces is performed to diagnose performance deterioration, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The invention extracts the diagnostic function from the physical membrane structure by using test water that interacts with the membrane surface. Instead of disassembling and physically analyzing membrane pieces, the method extracts diagnostic information through chemical interactions between test water components and the membrane, enabling rapid diagnosis without time-consuming disassembly while maintaining diagnostic accuracy through selective solute penetration detection
Solution Approach 2:
The invention introduces test water containing specific solutes as an intermediary medium to diagnose membrane deterioration. The test water acts as a mediator that interacts with the membrane surface and provides diagnostic information about membrane integrity and chemical deterioration through selective penetration of solutes, eliminating the need for direct physical analysis of membrane pieces
2Measurement precision
If complex disassembly procedures are used for diagnosis, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The invention extracts the essential diagnostic information from complex membrane analysis by focusing on the interaction between test water solutes and the membrane surface. This simplifies the diagnostic procedure from complex multi-step disassembly and physical analysis to a single integrated test water penetration assay, reducing procedural complexity while maintaining the ability to detect membrane deterioration
Solution Approach 2:
The test water composition is designed to perform multiple diagnostic functions simultaneously - detecting membrane integrity, chemical deterioration, and physical damage through the selective penetration of different solutes. This multi-functional approach eliminates the need for multiple separate diagnostic procedures, simplifying the overall diagnosis process while comprehensive assessment
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 method allows for rapid and straightforward diagnosis of the cause of performance deterioration in separation membrane modules, enabling timely countermeasures to maintain stable operation and water quality.
Implementation Method 1
a pressure equal to or higher than an osmotic pressure is applied to water containing a solute such as salt to allow the water to permeate through a reverse osmosis membrane
Implementation Method 2
a pressure equal to or higher than an osmotic pressure is applied to water containing a solute such as salt
Data Source
AI summary
The present invention relates to a state diagnosis method for a separation membrane module for obtaining permeate water from water-to-be-treated, the state diagnosis method including: supplying a test water containing at least two types of solutes to a separation membrane module, or individually supplying at least two types of a test water containing at least one type of solute to the separation membrane module; and comparing a separation performance based on a concentration of the solute contained in the permeate water to determine any of a type of an abnormality, a degree of an abnormality, and a generation position of an abnormality of the separation membrane module.