Microwave Imaging Sensor for Reverse Osmosis Membrane Monitoring
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Solution Overview
Problem
Current reverse osmosis membrane replacement schedules are time-based, leading to suboptimal frequency and potential water quality issues due to varying degradation rates and random failures, which cannot be effectively managed.
Innovation Solution
A microwave imaging sensor system, including ultra-wide band antennas and a processor, monitors the condition and status of reverse osmosis membranes in real-time, detecting leakage, fouling, and performance changes to determine the optimal replacement time based on individual membrane performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-based replacement schedule is used, then membranes are replaced periodically, but replacement frequency is not optimal and water quality cannot be maintained under varying degradation rates
Solution Approach 1:
The patent replaces the mechanical/time-based replacement system with an electromagnetic sensing system. Microwave antennas transmit electromagnetic waves through the membrane, and the reflected signals are analyzed to detect membrane condition, eliminating the need for time-based scheduling and enabling condition-based replacement timing.
Solution Approach 2:
The patent introduces microwave electromagnetic waves as an intermediary to indirectly assess membrane condition. The microwave signals interact with the membrane and surrounding water, and changes in signal reflection patterns indicate membrane degradation or failure, providing a non-intrusive monitoring mechanism.
2Measurement precision
If individual membrane monitoring is implemented, then real-time condition detection is achieved, but device complexity increases
Solution Approach 1:
The patent makes the microwave sensing system multi-functional by using the same antenna array for both transmitting microwave signals and receiving reflected signals. The system can detect multiple membrane conditions (integrity, fouling, degradation) simultaneously through signal analysis, reducing the need for separate sensing mechanisms.
Solution Approach 2:
The patent divides the monitoring function into discrete microwave antenna elements arranged in an array. Each antenna element can independently transmit and receive signals, allowing localized detection of membrane conditions at specific positions, which when combined provides comprehensive coverage without requiring a single complex sensor.
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
Enables continuous, real-time monitoring and timely replacement of reverse osmosis membranes, improving water quality and reducing costs by addressing the variability in membrane degradation and failure rates.
Implementation Method 1
RO membrane failures can be detected by monitoring the dielectric constant of the fresh water region adjacent to the RO membrane. Because fresh water has a different dielectric constant from saline water, a failure point in the RO membrane can be detected immediately whenever a failure develops that leaks saline water into the output stream.
Implementation Method 2
Multiple reflected microwave signals from multiple antennas disposed around at least a portion of the RO membrane according to the geometric configuration of the RO membrane allow reconstruction of 3D images of the RO membrane and the regions of water between which the RO membrane forms a semi-permeable barrier.
Data Source
AI summary
A microwave imaging sensor is disclosed for continuously monitoring the condition and status of an in situ reverse osmosis membrane that forms a semi-permeable barrier between a region of water containing a dissolved salt and a region of water which is intended to be substantially free of the dissolved salt. A device according to embodiments of the invention can be used to monitor the condition of the membrane, i.e., the ability of the membrane to filter water by reverse osmosis; and to detect failures in the membrane such as leaking saline water into the output stream. The results of the monitoring can be used to determine in real time whether or not the membrane should be replaced.