Deionization Filter pH Control via Dynamic Voltage Adjustment
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Solution Overview
Problem
Existing deionization filters using bipolar ion exchange films face challenges in maintaining appropriate pH levels, leading to deviations from drinking water standards and potential scale formation during recycling due to imbalances in ion exchange capacities.
Innovation Solution
A deionization filter device equipped with a pH sensor and controller that adjusts the type and magnitude of voltages applied to electrodes based on measured pH values, ensuring purified water stays within the 5.8 to 8.5 pH range and recycling pH values are equal to or lower than 9 to prevent scale formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bipolar ion exchange films are used for deionization operation, then ionic substances can be removed from raw water, but the pH value of purified water deviates from drinking water standards due to unbalance of ion exchange capacities
Solution Approach 1:
The patent employs a pH sensor to continuously monitor the pH value of purified water and feeds this information back to a controller. Based on the feedback signal, the controller dynamically adjusts the voltage applied to the bipolar ion exchange films, thereby compensating for pH deviations caused by unbalanced ion exchange capacities and maintaining pH within drinking water standards (6.5-8.5).
Solution Approach 2:
The patent changes the operating parameter (voltage magnitude and polarity) of the bipolar ion exchange films based on real-time pH measurements. By adjusting the voltage parameter dynamically, the system compensates for the unbalanced ion exchange capacities of the cation and anion exchange films, thereby controlling the pH value of purified water within acceptable ranges.
2Duration of action of stationary object
If bipolar ion exchange films are used for recycling operation, then films can be regenerated, but the pH value of water increases and becomes alkaline leading to scale formation
Solution Approach 1:
During recycling operation, the pH sensor continuously monitors the pH value of water, and the controller uses this feedback to adjust the voltage applied to the bipolar ion exchange films. When pH approaches alkaline conditions that could lead to scale formation, the controller modifies the voltage parameter to control the release of ions during regeneration, thereby preventing scale formation while maintaining effective film regeneration.
Solution Approach 2:
The system takes preliminary action by monitoring pH trends during recycling operation and adjusting voltage parameters before scale can form. By detecting pH increase trends and preemptively adjusting the voltage to control ion release, the system prevents the harmful effect of scale formation before it occurs.
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
The solution effectively maintains pH levels within drinking water standards and prevents scale formation by dynamically adjusting voltages during deionization and recycling operations, addressing the imbalances in ion exchange capacities.
Implementation Method 1
a deionization filter in which a deionization operation is performed using a bipolar ion exchange film having a cation exchange film and an anion exchange film
Implementation Method 2
a deionization filter for removing ionic substances contained in raw water, using electrical attraction force
Implementation Method 3
a pH sensor configured to detect a pH value of a solution to be treated by a voltage applied by the voltage source
Implementation Method 4
adjust a type and magnitude of voltages applied to electrodes, depending on the measured pH value of water
Data Source
AI summary
A deionization filter device includes a first electrode, a second electrode, at least one bipolar ion exchange sheet configured to include a cation exchange film and an anion exchange film, and disposed between the first electrode and the second electrode, a voltage source configured to apply a deionization voltage or a reproduction voltage between the first electrode and the second electrode, a pH sensor configured to detect a pH value of a solution to be treated by a voltage applied by the voltage source, and a controller configured to control the voltage source, depending on a pH value of the solution.