Reverse Osmosis Membrane Treatment System for Boron Removal
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Solution Overview
Problem
Existing reverse osmosis membrane treatment systems using double or more pass membranes often fail to achieve a sufficient water quality improvement effect.
Innovation Solution
A reverse osmosis membrane treatment system and method involving a first and second reverse osmosis membrane treatment unit, where the second membrane has a lower permeation flux per 1 MPa of effective pressure than the first, and is preferably modified with an oxidant such as a stabilized hypobromous or hypochlorous acid composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reverse osmosis membrane with high rejection performance is used in the second pass, then water quality improvement is achieved, but the permeation flux becomes too low for practical operation
Solution Approach 1:
The patent changes the permeation flux parameter of the second-pass reverse osmosis membrane to a specific range (0.15-0.50 m3/m2/d per 1 MPa effective pressure), which is lower than the first pass but optimized for rejection performance. This parameter optimization enables sufficient water quality improvement while maintaining practical operability
Solution Approach 2:
The patent divides the reverse osmosis treatment into multiple passes with different membrane characteristics. The first pass uses membranes with higher permeation flux for bulk treatment, while the second pass uses membranes with lower permeation flux and higher rejection for polishing, achieving both productivity and water quality goals through segmented treatment stages
2Manufacturing precision
If the permeation flux of the second reverse osmosis membrane is reduced to improve rejection, then water quality improves, but the effective pressure required increases
Solution Approach 1:
The patent optimizes the permeation flux parameter of the second-pass membrane to a balanced range (0.15-0.50 m3/m2/d per 1 MPa) that achieves high rejection without requiring excessive effective pressure. This parameter selection resolves the contradiction between rejection performance and pressure requirements
3Manufacturing precision
If a reverse osmosis membrane with very low permeation flux is used to achieve high rejection, then water quality improves, but the treatment efficiency decreases
Solution Approach 1:
The patent identifies and implements an optimal permeation flux range (0.15-0.50 m3/m2/d per 1 MPa effective pressure) for second-pass membranes. This optimized parameter range achieves sufficient water quality improvement while preventing treatment efficiency from becoming too low, resolving the contradiction between quality and productivity
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 configuration achieves a sufficient water quality improvement effect by optimizing the permeation flux and rejection performance of the second reverse osmosis membrane, particularly in removing boron and low-molecular-weight organic substances.
Implementation Method 1
a reverse osmosis membrane treatment system and a reverse osmosis membrane treatment method using a reverse osmosis membrane, in which treatment target water such as industrial water or city water is treated with the reverse osmosis membrane to obtain permeated water (treated water) and concentrated water
Implementation Method 2
the second reverse osmosis membrane is preferably a membrane modified with an oxidant
Data Source
AI summary
A reverse osmosis membrane treatment system is provided with a first reverse osmosis membrane treatment device wherein water to be treated is passed through a first reverse osmosis membrane to obtain first permeate water and first concentrated water, and at least a second reverse osmosis membrane treatment device, wherein the first permeate water is passed through a second reverse osmosis membrane to obtain second permeate water and second concentrated water. The permeation flux per 1 MPa of effective pressure for the second reverse osmosis membrane is lower than the permeation flux per 1 MPa of effective pressure for the first reverse osmosis membrane, and the permeation flux per 1 MPa of effective pressure for the second reverse osmosis membrane is 0.5 m3/m2/d or less.