Chemical Feed Pump Control for Water Treatment
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Solution Overview
Problem
Water utilities face challenges in maintaining optimal chemical concentrations in water systems due to fluctuations over time, requiring manual intervention to adjust chemical feed rates, especially during unexpected system failures and gradual changes in residual chemical concentrations.
Innovation Solution
A method and system for automatically controlling the feed rate of chemicals into a body of water by determining chemical pump usage over a designated period and adjusting the chemical feed rate based on set-points, either increasing or decreasing the feed rate to maintain optimal chemical concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chemical feed pump operates at slow feed rates to address unexpected system failures and provide gradual change in residual chemical concentration, then reliability and stability are improved, but the ability to address residual chemical demands deteriorates
Solution Approach 1:
The system dynamically adjusts the chemical feed pump rate based on real-time monitoring of residual chemical concentration and detected system failures. The controller modifies pump operation from slow steady-state operation to variable-rate operation, increasing feed rate when failures are detected or residual concentration drops below thresholds, while maintaining slow operation during normal conditions to provide gradual changes and conserve chemical supplies.
Solution Approach 2:
The system implements feedback control by continuously monitoring residual chemical concentration and using this information to adjust pump operation. When concentration falls below predetermined thresholds or system failures are detected, the feedback mechanism triggers increased pump feed rates. This closed-loop control enables the system to respond automatically to changing conditions without manual intervention.
2Adaptability or versatility
If manual intervention is used to adjust chemical feed rates in response to concentration changes, then adaptability is improved, but device complexity and operational burden increase
Solution Approach 1:
The system performs self-service by automatically monitoring residual chemical concentration and adjusting pump operation without requiring manual intervention. The controller continuously evaluates concentration levels and pump performance, making adaptive adjustments to feed rates based on predetermined criteria. This automation eliminates the need for operators to manually respond to concentration changes, reducing operational burden while maintaining full adaptability.
Solution Approach 2:
The system replaces manual mechanical adjustment with automated electronic control. Instead of operators physically adjusting pump settings in response to concentration changes, an electronic controller with sensors and actuators performs the adjustment automatically. This substitution of mechanical/manual operations with electronic automation maintains adaptability while significantly reducing operational complexity and burden.
Data Source
AI summary
A method of controlling a feed rate of at least one chemical into a body of water includes: (a) dispensing one or more chemicals into a body of water with a chemical pumping device; (b) determining a chemical feed pump usage of at least one chemical into the body of water during a designated period of time; and (c) (i) automatically increasing chemical gain of the at least one chemical into the body of water if the pump usage is greater than a first pump usage set-point, or (ii) automatically decreasing chemical gain of the at least one chemical into the body of water if the pump usage is less than a second pump usage set-point. A system for using the method is also included.