Pure Water Production pH Control via Feedback
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Solution Overview
Problem
Existing methods for producing pure water using reverse osmosis membrane separation after decarboxylation under acidic conditions face challenges in maintaining optimal pH levels, leading to variable water quality due to changes in raw water quality, which affects the specific resistance of the permeated water.
Innovation Solution
A method that measures the pH and water quality of inflow water into the reverse osmosis membrane separation device, adjusts the pH by a predetermined width, and compares average water quality values before and after the adjustment to maintain the permeated water within a predetermined range, using a control device to periodically adjust the pH and ensure stable water quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pH of inflow water is adjusted based on a relation curve between pH and specific resistance, then specific resistance of permeated water can be improved, but when raw water quality changes, the pH may deviate from appropriate value and water quality deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the actual specific resistance of permeated water is measured and fed back to adjust the pH of inflow water. The control device compares the measured specific resistance with a target value and automatically adjusts pH accordingly, ensuring stable water quality even when raw water quality changes. This closed-loop feedback system resolves the contradiction by continuously adapting to changing conditions rather than relying on predetermined relation curves.
2Manufacturing precision
If pH is controlled tightly to maintain water quality, then manufacturing precision improves, but the system becomes more sensitive to raw water quality changes and requires frequent adjustments
Solution Approach 1:
The patent employs a self-regulating control system that automatically monitors specific resistance and adjusts pH without external intervention. The control device independently processes measurements and executes adjustments, making the system self-sufficient in maintaining water quality. This reduces operational complexity while maintaining tight control, as the system serves itself rather than requiring complex external control mechanisms.
Solution Approach 2:
The patent dynamically changes the pH parameter based on real-time specific resistance measurements. Rather than maintaining a fixed pH setpoint, the system adjusts pH as a variable parameter in response to changing water quality conditions. This parameter change approach simplifies the control strategy while achieving precise water quality control, resolving the contradiction between tight control and system complexity.
3Reliability
If pH is adjusted frequently to compensate for raw water quality changes, then water quality stability improves, but measurement and adjustment frequency increases system complexity
Solution Approach 1:
The patent implements periodic measurement and adjustment cycles rather than continuous operation. The control device measures specific resistance at regular intervals and adjusts pH periodically based on these measurements. This periodic action maintains water quality stability while reducing system complexity compared to continuous monitoring and adjustment, as the system operates in discrete cycles rather than continuously.
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 ensures stable and high-quality permeated water by adjusting the pH of the inflow water based on real-time and historical water quality data, effectively maintaining specific resistance within a desired range even with short-term changes in raw water quality.
Implementation Method 1
deionizing water to be treated using a reverse osmosis membrane separation device
Implementation Method 2
decarboxylating the water to be treated under acidic conditions
Implementation Method 3
since CO2 assumes a CO2 gas form when pH is low
Data Source
AI summary
A pure water production method for producing pure water by decarboxylating water to be treated under acidic conditions and then deionizing the result by using a reverse osmosis membrane separation device, the pH of inflow water flowing into the reverse osmosis membrane separation device and the water quality of permeated water of the reverse osmosis membrane separation device being measured, and the pH of the inflow water being adjusted on the basis of the measured pH and water quality so that the water quality of the permeated water is within a prescribed range, wherein the pH of the inflow water is changed by a predetermined width, and an operation condition adjusting step is performed for adjusting the pH of the inflow water by comparing the(average value before the water quality change average value after the water quality change.