Electrodialysis System With Pulsating Voltage For Precise pH Control
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Solution Overview
Problem
Conventional electrodialysis systems for producing acidic and alkaline water suffer from low water recovery rates, inefficient operation at elevated temperatures, membrane fouling, and inability to produce water with precisely defined pH levels, making them inefficient for various applications.
Innovation Solution
An advanced electrodialysis system utilizing a cation-exchange membrane and an anion-exchange membrane, combined with a pulsating voltage, to simultaneously produce acidic and alkaline water in separate chambers, allowing for precise control of pH levels without the need for added chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrodialysis process is used to produce acidic and alkaline water, then water can be produced for various applications, but water recovery rate is low and operation efficiency at elevated temperatures is poor
Solution Approach 1:
The patent employs dynamic voltage control with pulse reversal technology, where the voltage polarity is periodically reversed to prevent ion accumulation and membrane fouling. This dynamic operation mode allows the system to maintain high efficiency at elevated temperatures by continuously adjusting the electric field distribution, thereby improving both water recovery rate and operational reliability simultaneously
Solution Approach 2:
The system optimizes multiple operating parameters including voltage amplitude, pulse frequency, and duty cycle to achieve peak performance at elevated temperatures. By dynamically adjusting these parameters based on temperature conditions, the system maximizes water recovery rate while maintaining stable operation efficiency, resolving the contradiction between productivity and reliability
2Productivity
If conventional electrodialysis system is used, then acidic and alkaline water can be produced, but membrane fouling or scaling occurs due to process reversal
Solution Approach 1:
The patent implements periodic voltage reversal where the electric field polarity is systematically switched between positive and negative cycles. This periodic action prevents ions from accumulating on membrane surfaces, thereby eliminating the root cause of membrane fouling and scaling while maintaining continuous water production capability
Solution Approach 2:
The system maintains continuous water production through uninterrupted electrodialysis operation with pulse reversal. The periodic voltage switching ensures that ion transport continues without cessation while preventing fouling, achieving both sustained productivity and membrane cleanliness simultaneously
3Adaptability or versatility
If standard electrodialysis system is used, then water can be produced, but pH levels cannot be precisely controlled and adaptability to various applications is limited
Solution Approach 1:
The patent incorporates pH sensors and control systems that continuously monitor the pH levels in both acidic and alkaline water chambers. Based on real-time feedback, the system automatically adjusts voltage parameters to maintain precise pH control, enabling adaptation to various applications requiring specific pH ranges while ensuring manufacturing precision
Solution Approach 2:
The system is designed with adjustable operating parameters and dual-chamber configuration that can produce acidic, alkaline, and neutral water with controlled pH levels. This multi-functional capability allows the same system to serve various applications including drinking water preparation, industrial processing, and agricultural uses, achieving both adaptability and precision
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 system achieves efficient production of reprogrammed water with precise pH control, improving adaptability and efficiency for diverse applications, while avoiding chemical additives and reducing operational challenges like membrane fouling.
Implementation Method 1
the pulsating voltage causes a dissociation of the cations and anions present in the water molecules
Implementation Method 2
anions and cations respectively move to an anode and a cathode by utilizing the selective permeability of an ion exchange membrane
Implementation Method 3
a monitoring unit configured to continuously determine a pH level of the water in the first chamber and the second chamber
Data Source
Figure 1~2
Figure 3A~4
AI summary
An advanced electrodialysis system (100, 200) for the simultaneous production of acidic and alkaline water is provided. The system (100, 200) includes a first chamber (102, 202) and a second chamber (104, 204) separated by a separation unit (106, 206). A pulsating voltage applied to the first electrode (108) and the second electrode (110) causes dissociation of ions present in the water molecules in the first chamber (102, 202) and the second chamber (104, 204) allowing to produce the acidic water and the alkaline water. A monitoring unit (116, 216) continuously determines pH level of the water and an electronic control unit (120, 220) controls the pulsating voltage applied to the first electrode (108) and the second electrode (110) based on the monitored pH levels. The electrodialysis system (100, 200) is designed for efficient and adaptable production of water with varying pH levels, making it suitable for a wide range of applications.