Automated Titration in Recirculating Fluid Systems
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Solution Overview
Problem
Conventional titration methods are ineffective in recirculating water systems as they can disrupt the chemical balance by adding reagents to flowing water, particularly in small bodies like spas and pools, requiring a method to minimize reagent usage and avoid adverse chemical impacts.
Innovation Solution
A method and device for determining chemical concentrations in recirculating analyte systems by controlling the flow rate of a reagent and measuring indicators downstream, using a system with a flow rate meter, pump, and computing element to calculate concentrations without significantly altering the water chemistry, involving techniques like linear and binary progression to minimize reagent addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reagent is added to recirculating water system for measurement, then chemical concentration can be determined, but chemical balance of the water system is adversely affected
Solution Approach 1:
The system uses partial action by adding reagent at controlled flow rates only until the equivalence point is reached (indicated by pH threshold), rather than adding excessive reagent. The reagent flow rate is dynamically adjusted based on real-time pH measurements to achieve precise stoichiometric neutralization, minimizing chemical imbalance while ensuring accurate concentration determination.
Solution Approach 2:
The system implements continuous feedback control by monitoring pH levels in real-time during reagent addition. The pH probe provides continuous feedback to the control system, which adjusts the reagent flow rate dynamically to maintain the water chemistry within acceptable ranges while achieving accurate titration results.
2Productivity
If reagent flow rate is increased to reach equivalence faster, then measurement time is reduced, but quantity of reagent used increases
Solution Approach 1:
The system employs dynamic reagent flow rate adjustment based on real-time pH measurements. The reagent pump operates at variable speeds, increasing flow rate when pH indicates excess base and decreasing when acid is approaching equivalence. This dynamic control optimizes both measurement speed and reagent consumption by adapting the addition rate to the actual chemical state of the water.
Solution Approach 2:
The system changes the reagent flow rate parameter dynamically during the titration process based on pH measurements. The control system adjusts the pump flow rate parameter in real-time, transitioning from higher initial rates to lower rates as equivalence approaches, thereby optimizing the balance between measurement speed and reagent consumption.
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 allows for accurate determination of chemical concentrations in recirculating water systems while minimizing the quantity of reagent used, thus preserving the chemical balance and reducing the impact on aquatic facilities.
Implementation Method 1
a pH probe to measure the pH of the water sample
Implementation Method 2
a peristaltic pump to move the water sample through a tube
Implementation Method 3
a known amount of reagent is added to the recirculating water sample
Data Source
AI summary
A method for determining a concentration of a chemical of interest in a recirculating analyte system includes the steps of selecting a first indicator threshold, measuring the flow rate of the recirculating analyte system, controllably adding a known amount of reagent to the recirculating analyte system at an known flow rate, repetitively measuring an indicator of the recirculating analyte system downstream from the addition of the reagent, and computing the concentration of the chemical of interest of the recirculating analyte system when the indicator measurement crosses the indicator threshold.