Fluorescent Tracer Bolus Injection for Osmosis Membrane Monitoring
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Solution Overview
Problem
Traditional methods for evaluating membrane separation process efficiency require a stable tracer concentration in both feed and permeate streams, which can take a long time to achieve, leading to increased tracer consumption and operator time, and may result in erroneous efficiency measurements if equilibrium is not reached.
Innovation Solution
A technique involving the injection of a bolus of fluorescent tracer for a short duration, allowing for the calculation of flow rate-independent cumulative-time concentrations in both streams, enabling efficient membrane efficiency determination without requiring equilibrium tracer concentrations in the permeate stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional continuous tracer dosing is used to achieve stable tracer concentration in feed and permeate streams, then measurement precision of membrane efficiency is improved, but loss of time and tracer consumption increase significantly
Solution Approach 1:
The patent applies periodic action by using intermittent bolus injections of fluorescent tracer instead of continuous dosing. The system injects tracer in periodic pulses (e.g., 10 mL bolus every 15 minutes) and measures permeate concentration during and after each injection. This periodic approach allows membrane efficiency evaluation without requiring continuous equilibrium conditions, significantly reducing both time consumption and total tracer usage while maintaining measurement accuracy through multiple measurement opportunities.
Solution Approach 2:
The patent applies preliminary action by pre-dosing the feed stream with fluorescent tracer before permeate sampling. The tracer is introduced into the feed stream upstream of the membrane, allowing it to distribute and equilibrate within the feed side before permeate is collected and analyzed. This preliminary dosing ensures that when permeate is sampled, adequate tracer is present to enable accurate measurement without requiring prolonged equilibrium establishment.
2Measurement precision
If traditional continuous tracer dosing is used to achieve stable tracer concentration, then measurement precision of membrane efficiency is improved, but quantity of tracer consumed increases
Solution Approach 1:
The patent applies periodic action by using intermittent bolus injections of fluorescent tracer instead of continuous dosing. The system injects tracer in periodic pulses (e.g., 10 mL bolus every 15 minutes) and measures permeate concentration during and after each injection. This periodic approach allows membrane efficiency evaluation without requiring continuous equilibrium conditions, significantly reducing both time consumption and total tracer usage while maintaining measurement accuracy through multiple measurement opportunities.
3Productivity
If tracer dosing is stopped before equilibrium is reached, then productivity of membrane evaluation is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent applies feedback by continuously monitoring permeate tracer concentration and using this information to calculate membrane rejection efficiency in real-time. The system measures fluorescent tracer concentration in permeate during and after bolus injections, compares these measurements to feed stream concentration, and computes rejection efficiency dynamically. This feedback mechanism allows accurate efficiency determination even when equilibrium is not fully reached, as each measurement provides information about the membrane's actual performance at that moment.
Solution Approach 2:
The patent applies partial action by performing membrane efficiency evaluation using only a portion of the tracer that would be required for complete equilibrium. Instead of dosing until full equilibrium is achieved across the entire system, the method captures sufficient tracer in the permeate stream during the injection and immediate post-injection period to calculate accurate rejection efficiency. This partial approach achieves the measurement goal with reduced tracer exposure time and quantity.
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 reduces the time and tracer consumption required for membrane efficiency evaluation, providing accurate rejection efficiency measurements by integrating tracer concentrations over measurable periods, thus improving the efficiency and cost-effectiveness of membrane monitoring.
Implementation Method 1
fluorometrically analyzing the feed stream and determining therefrom a measured concentration of the fluorescent tracer in the feed stream
Implementation Method 2
contacting an osmosis membrane with the feed stream, thereby generating a permeate stream and a concentrate stream
Implementation Method 3
reverse osmosis is widely used in water purification processes to remove ions, bacteria, and other molecules and larger particles from the water
Data Source
AI summary
A fluorometric monitoring technique can be used to rapidly evaluate the efficiency of an osmosis membrane. In some examples, the technique includes injecting a bolus of fluorescent tracer into a feed stream. The tracer may be introduced for a period of time less than what is required for the tracer to reach an equilibrium concentration in the permeate stream. The feed stream and the permeate stream may be fluorometrically analyzed to determine a flow rate-independent cumulative-time concentration of the fluorescent tracer in the both streams. The efficiency of the osmosis membrane can then be determined based on these flow rate-independent cumulative-time concentrations.