Autonomous Sensor Chamber Biofouling Control via Biocide Injection
Solution Overview
Problem
Biofouling remains a significant challenge in aquatic environment monitoring, causing operational issues and data corruption in sensors, and existing anti-fouling methods are either toxic or inefficient, leading to frequent and costly maintenance.
Innovation Solution
An autonomous monitoring device with a preprogrammed controller that operates in a sampling cycle, followed by an anti-fouling treatment period where a biocide is released to create an anti-fouling environment around the sensors, using a density gradient mechanism to minimize energy and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toxic anti-fouling paints incorporating metal biocides are used, then biofouling control is improved, but harm to living organisms increases
Solution Approach 1:
The patent converts the harmful effect of biocides by containing them within a sealed reservoir system that prevents environmental release. The biocide is injected into the sensor chamber only when needed for anti-fouling treatment, and the chamber is sealed to contain the biocide and treated water, transforming a potentially harmful substance into a controlled therapeutic agent that eliminates fouling organisms without environmental contamination.
Solution Approach 2:
The sensor chamber acts as an intermediary containment space between the biocide reservoir and the external aquatic environment. This intermediate chamber allows the biocide to be introduced and mixed with water in a controlled manner, providing anti-fouling treatment to the sensor while preventing direct contact between the biocide and the external ecosystem.
2Reliability
If mechanical wipers are used for anti-fouling, then some biofouling removal capability is provided, but energy consumption increases and complete prevention is not achieved
Solution Approach 1:
The patent replaces the mechanical wiper system with a chemical treatment system. Instead of using mechanical force to remove fouling organisms, the system injects biocide into the sensor chamber to chemically eliminate fouling organisms. This substitution eliminates the need for continuous mechanical action and associated energy consumption while providing more complete fouling prevention.
Solution Approach 2:
The anti-fouling treatment is applied periodically through controlled injection cycles rather than continuously. The microprocessor controls the injection pump to introduce biocide at specific intervals based on sensor operation cycles, providing effective fouling prevention while minimizing energy consumption and biocide usage compared to continuous treatment systems.
3Productivity
If sensors are deployed for extended periods, then monitoring productivity is improved, but biofouling accumulation increases requiring frequent maintenance
Solution Approach 1:
The system applies anti-fouling treatment in advance before significant fouling accumulation occurs. The microprocessor monitors sensor operation time and triggers biocide injection at predetermined intervals to prevent fouling buildup rather than treating existing fouling. This preliminary action maintains sensor reliability and data quality throughout extended deployment periods.
Solution Approach 2:
The system maintains continuous protection against biofouling through periodic treatment cycles during extended sensor deployment. The microprocessor continuously manages the anti-fouling system by scheduling regular biocide injections and stirring cycles, ensuring uninterrupted sensor performance and data quality throughout the deployment period without requiring retrieval for maintenance.
4Reliability
If biocide is continuously released in the environment, then biofouling control is improved, but environmental harm and biocide consumption increase
Solution Approach 1:
The patent extracts the biocide from the external environment and contains it within a sealed reservoir system attached to the sensor. The biocide is stored in a controlled environment and only introduced into the sensor chamber when needed for treatment. This extraction prevents continuous environmental release and reduces overall biocide consumption by limiting it to the immediate sensor vicinity.
Solution Approach 2:
The anti-fouling treatment is applied locally within the sensor chamber rather than diffusely in the surrounding environment. The biocide is injected into the confined chamber space where it directly contacts the sensor surfaces needing protection. This localized application concentrates the biocide effect where needed while minimizing overall biocide consumption and preventing environmental 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
The device enables extended deployment of sensors without frequent maintenance, ensuring uncorrupted data by effectively controlling biofouling and reducing the need for regular servicing, thus enhancing the efficiency and cost-effectiveness of aquatic environment monitoring.
Implementation Method 1
allowing a biocide solution to form a density gradient within the sensor chamber
Data Source
AI summary
The device with biofouling control for monitoring aquatic (or gaseous) environment encloses an environmental sensor instrument in a sensor chamber which programmably opens for allowing direct communication between the sensors and the water of interest for sampling and which is closed after the sampling sequence is completed to create an anti-fouling environment in the sensor chamber by adding a biocide into the chamber and exposing the sensors to the anti-fouling environment for a predetermined period of time. The monitoring device includes a microprocessor which is preprogrammed prior to deployment of the device (and which may be re-programmed from a remote host computer during the deployment) into the aquatic environment and which controls the operation of the entire device for a long deployment (up to several months). The opening/closing of the sensor housing, instrument sampling and release of the biocide into the chamber are synchronized to provide the most effective sampling/anti-fouling sequence of operations of the autonomous device.