Adaptive Wastewater Control via Proportionality Factor Adjustment
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Solution Overview
Problem
Wastewater treatment processes with dead time profiles face challenges in accurately regulating precipitant dosage due to variations in precipitant composition, wastewater matrix changes, and lack of monitoring for process effectiveness, leading to overdosing or underdosing issues.
Innovation Solution
A method involving a control system that determines digital values for process parameters, calculates set values using a first proportionality factor, adjusts output variables, and determines a second proportionality factor based on deviation values, allowing for adaptive control and improved regulation by monitoring the effectiveness of precipitant dosage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If load-dependent control with fixed proportionality factor is used, then control simplicity is maintained, but control precision deteriorates due to unaccounted process variations
Solution Approach 1:
The patent implements feedback by continuously monitoring the phosphate concentration at the process outlet and using this information to adjust the proportionality factor. The control system compares the actual phosphate removal effectiveness with expected values and adapts the control parameter accordingly, transforming the open-loop fixed-proportionality system into a closed-loop adaptive system that maintains precision while preserving operational simplicity.
Solution Approach 2:
The patent dynamically changes the proportionality factor parameter based on monitored process conditions. Instead of using a fixed proportionality factor, the system adjusts this parameter in response to variations in wastewater composition, precipitant effectiveness, and phosphate load, thereby maintaining accurate precipitant dosage control despite changing process conditions.
2Measurement precision
If outlet phosphate concentration monitoring is implemented, then dosage effectiveness is improved, but dead time delays control response
Solution Approach 1:
The patent applies preliminary action by using the monitored outlet phosphate concentration data to adjust the proportionality factor for future dosing decisions. Rather than attempting to react to each individual deviation in real-time, the system uses the feedback information to proactively adjust the control parameter, ensuring that subsequent precipitant dosages are optimized based on learned process characteristics, thereby compensating for the inherent dead time.
3Measurement precision
If adaptive control with variable proportionality factor is used, then control precision is improved, but system complexity increases
Solution Approach 1:
The patent uses feedback mechanisms where the control system monitors outlet phosphate concentration and automatically adjusts the proportionality factor based on the observed effectiveness. This closed-loop approach maintains high control precision while managing complexity through automated adaptation rather than requiring complex manual intervention or overly sophisticated control algorithms.
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
This approach enables precise control of wastewater treatment processes by adapting to changing conditions, reducing errors in precipitant dosage and improving process efficiency by comparing the first and second proportionality factors, thus minimizing overdosing and underdosing.
Implementation Method 1
A dead time profile that a change in at least one parameter of the first type of the process medium at the system input causes a change in at least one parameter of the second type of the process medium at the system output only after a dead time
Data Source
AI summary
A method for controlling a treatment process of a medium that includes a system input and output, wherein a change in a first parameter of the medium at the system input causes a change in a second parameter at the system output only after an elapse of a dead time, and a control system, the method including determining first values of the first parameter; determining set values for an output variable influencing the second parameter at the system output using the determined first values and a first proportionality factor recorded in the control system; applying the determined set values to adjust the output variable; determining second values of the second parameters; determining deviation values representative of a deviation of the second parameter from the first parameter; and using at least one of the deviation values and at least one of the set values to determine a second proportionality factor.