Lag-Time Compensated CT Value Control for Aquatic Remediation
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Solution Overview
Problem
Current systems for controlling remediation cycles in aquatic facilities face challenges in accurately calculating the chlorine dioxide CT value due to lag-time, leading to inefficiencies in completing remediation cycles, particularly in the presence of chlorine-resistant pathogens like Cryptosporidium, which can result in prolonged facility closures and economic burdens.
Innovation Solution
A method and system that compensates for lag-time by calculating a lag-time compensated chlorine dioxide CT value using the process controller, which involves measuring chlorine dioxide concentrations and adjusting the feed system to ensure timely achievement of the targeted CT value, thereby reducing the time required to complete remediation cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional chlorine dioxide feed systems are used without lag-time compensation, then the system is simpler to operate, but the remediation cycle time is significantly prolonged due to inaccurate CT value calculation
Solution Approach 1:
The system pre-calculates and compensates for lag-time in the CT value computation. By anticipating the delay between chemical injection and sensor detection, the controller adjusts the CT value calculation to account for this time gap, enabling more accurate tracking of the remediation progress and reducing overall cycle time.
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors chlorine dioxide concentration via sensor and compares it against target values. The lag-time compensated CT calculation provides feedback to the controller, which then adjusts the chemical feed rate dynamically to achieve the desired CT value more quickly and accurately.
2Productivity
If high concentrations of chlorine dioxide are applied to achieve rapid remediation, then the remediation effectiveness improves, but the risk of overfeeding and safety hazards increases
Solution Approach 1:
The system dynamically adjusts the chlorine dioxide feed rate based on real-time sensor readings and lag-time compensated CT calculations. Rather than using fixed high concentrations, the controller modulates the feed rate to maintain optimal treatment effectiveness while preventing overfeeding, thereby balancing productivity and safety.
Solution Approach 2:
The system changes the concentration parameter of chlorine dioxide dynamically during the remediation process. By using lag-time compensation to accurately track the cumulative exposure, the controller can adjust concentration levels to achieve effective remediation while maintaining safety margins and avoiding hazardous overfeeding conditions.
3Measurement precision
If lag-time compensation is implemented for accurate CT value calculation, then the remediation cycle completion time is reduced, but the measurement and control system becomes more complex
Solution Approach 1:
The lag-time compensation value is pre-calculated and stored in the controller based on system characteristics. This preliminary setup allows the controller to automatically apply the correct compensation factor during CT value calculation without requiring complex real-time computations, thus improving measurement precision while minimizing control algorithm complexity.
Data Source
AI summary
A system and method for controlling and accelerating a Recovery Remediation cycle for the treatment of water of an aquatic facility for immersion by humans using a process controller programmed to obtain a targeted chlorine dioxide CT Value in the water. The system controls a Recovery Remediation cycle and utilizes a lag-time compensated Ct Value to reduce the time to complete the remediation cycle.