Electrolyzer-Driven Pressurization for Reverse Osmosis
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Solution Overview
Problem
Conventional reverse osmosis membrane water treatment processes for seawater desalination require significant electrical power to pressurize the water, leading to high energy consumption and costs.
Innovation Solution
A water treatment device that incorporates a water electrolyzer to produce oxygen gas, which is used to pressurize the raw water, eliminating the need for a compressor and reducing power consumption by applying the gas pressure to the reverse osmosis membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a compressor is used to pressurize seawater for reverse osmosis, then the water can pass through the membrane effectively, but the electrical power consumption increases significantly
Solution Approach 1:
The patent replaces the mechanical compressor system with an electrochemical system (water electrolyzer) that generates gas pressure to pressurize the feed water. Instead of using electrical power to drive a mechanical compressor, the system uses electricity to split water into hydrogen and oxygen gases, and the pressure of these gases is used to push water through the reverse osmosis membrane, thereby substituting a mechanical pressurization system with an electrochemical-gas pressure system.
Solution Approach 2:
The patent introduces gas (hydrogen and oxygen from electrolysis) as an intermediary medium to transfer energy for pressurization. The gas acts as a mediator between the electrical energy input and the mechanical pressurization of water, allowing energy transfer without direct mechanical compression. The gas pressure serves as the intermediary force that drives water through the membrane.
2Productivity
If a compressor is used to pressurize raw water, then the reverse osmosis process can proceed, but the equipment cost and complexity increase
Solution Approach 1:
The patent merges the water electrolysis function with the pressurization function into a single integrated system. The water electrolyzer serves dual purposes: it produces gases for oxygen supply and simultaneously generates the pressure needed for reverse osmosis. This combination eliminates the need for a separate compressor unit, reducing equipment complexity while maintaining desalination capability.
Solution Approach 2:
The water electrolyzer is designed to perform multiple functions: it generates oxygen gas for aeration, produces hydrogen gas, and creates pressure for water pressurization. This multi-functional device replaces what would traditionally require separate equipment (compressor, oxygen generator), thereby reducing overall system complexity and equipment costs.
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 power consumption and costs associated with compressors, while maintaining high oxygen concentrations in the treated water, making it suitable for agricultural applications and potentially lowering equipment costs.
Implementation Method 1
a water electrolyzer configured to produce oxygen gas by electrolyzing water
Implementation Method 2
A large amount of electrical power is consumed when causing the water content of seawater to pass through a reverse osmosis membrane
Data Source
AI summary
A water treatment device includes: a water electrolyzer configured to produce oxygen gas by electrolyzing water; a pressurization mechanism pressurizing raw water by being supplied with the oxygen gas produced in the water electrolyzer; and a processor to which the raw water pressurized by the pressurization mechanism is supplied, the processor including a reverse osmosis membrane.