Wastewater Level Sensor FOG Contaminant Correction
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Solution Overview
Problem
Existing wastewater level sensors face inaccuracies and distortions due to contaminant build-up, particularly FOG (fats, oils, and grease), leading to false readings, pump misoperation, and potential overflow issues in wastewater treatment plants.
Innovation Solution
A method to correct electrode-based liquid level sensor readings by using algorithms that account for predictable electrical signal distortions caused by FOG contaminants, allowing for more accurate measurements even when the liquid level exceeds the electrode position, and directing FOG contaminants to non-conducting regions to minimize signal distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrode-based level sensors are used to measure wastewater level, then level measurement capability is provided, but measurement precision deteriorates due to FOG contaminant build-up on electrodes
Solution Approach 1:
The system continuously monitors electrical signal characteristics from the electrodes and uses feedback algorithms to detect deviations caused by FOG build-up. When contamination is detected, the system automatically adjusts or triggers cleaning mechanisms to restore electrode performance, maintaining measurement precision despite the harmful contaminant presence.
Solution Approach 2:
The patent replaces direct mechanical contact-based level sensing with electrical field-based detection. By measuring electrical conductivity changes in the wastewater rather than relying on physical contact at specific levels, the system reduces the impact of FOG contaminants on measurement accuracy.
2Measurement precision
If frequent cleaning of electrodes is performed to maintain measurement accuracy, then measurement precision is maintained, but productivity deteriorates due to time lost for cleaning operations
Solution Approach 1:
The system performs preliminary detection of FOG build-up through continuous electrical signal monitoring before it severely impacts measurement accuracy. By detecting contamination early and implementing preventive maintenance measures, the system avoids the need for frequent and extensive cleaning operations, thereby maintaining both precision and productivity.
Solution Approach 2:
The electrode cleaning mechanism is designed to automatically clean the electrodes without requiring manual intervention. The system self-maintains its measurement capability by periodically activating cleaning devices, eliminating the need for operational downtime associated with manual cleaning operations.
3Reliability
If electrode-based sensors are used in high FOG environments, then level measurement is enabled, but reliability deteriorates due to false readings and pump misoperation
Solution Approach 1:
The system uses feedback algorithms to continuously validate electrical signal readings from the electrodes. When FOG build-up causes signal distortion or false readings are detected, the system automatically corrects the measurements or triggers alerts, preventing pump misoperation and maintaining system reliability despite the presence of contaminants.
Solution Approach 2:
The system implements protective measures in advance, such as coating electrodes with hydrophobic materials or designing cleaning mechanisms that prevent FOG accumulation before it can cause false readings. This preemptive protection ensures continuous reliable operation without sudden failures due to contamination.
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
Improves the accuracy of wastewater level measurements, preventing pump misoperation and overflow risks, while reducing the need for frequent cleaning and enhancing the ability to detect high liquid levels in treatment plants.
Implementation Method 1
The control panel or other wastewater level computing device often applies a low AC voltage to each contact or electrode, and checks each electrode for a current to ground (or to another separate reference electrode, which again may be a ground).
Implementation Method 2
after the water level has dropped and the bridge has somewhat dried out, capillary action by the FOG contaminant bridge may wick liquid up from rising wastewater up through the waste material.
Data Source
AI summary
A method, useful for wastewater liquid level indication rods in wastewater treatment facilities, of correcting the readings from the rod's electrode based liquid level sensors for inaccuracies and distortions caused by fat, oil, and grease (FOG) contaminant build up. The method may also detect how the electrical signals change as the liquid levels progress ever higher above the level of the measuring electrode of interest. These methods allow for the creation of improved wastewater liquid monitoring systems and management systems that can warn when cleaning is needed, help prevent pump burnout, overflow, and address other common wastewater management problems.