Multi-Chamber Reverse Osmosis System with Dynamic Switching
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Solution Overview
Problem
Current reverse osmosis (RO) and nanofiltration (NF) systems face challenges in efficiently processing feed water of varying quality and maintaining recovery rates, as they rely on a single feed chamber that becomes less efficient over time due to increasing salt concentration, leading to reduced productivity and waste generation.
Innovation Solution
The system employs multiple feed chambers with a switching mechanism that detects efficiency reductions, allowing the concentrated feed stream to be recycled and pressure-reduced, then switched between chambers for continuous cleaning and desalination, using desaturation units to remove contaminants, and pre-treatment to maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single feed chamber is used for reverse osmosis processing, then the system structure is simple, but the process efficiency reduces over time due to increasing salt concentration
Solution Approach 1:
The system divides the single feed chamber into multiple feed chambers (first feed chamber, second feed chamber, etc.). Each chamber can be independently operated and switched, allowing continuous processing while one chamber is being cleaned or regenerated. This segmentation resolves the contradiction by maintaining simple individual chamber structures while achieving high overall productivity through parallel operation.
Solution Approach 2:
The system implements dynamic switching between multiple feed chambers based on real-time monitoring of salt concentration and process efficiency. When one chamber reaches optimal salt concentration, the system automatically switches to another chamber, ensuring continuous high-efficiency operation. This dynamic adaptation resolves the contradiction by preventing efficiency degradation while maintaining operational simplicity.
2Loss of substance
If feed water is continuously recycled in a single chamber, then waste generation is reduced, but salt concentration increases reducing recovery rate
Solution Approach 1:
The system segments the recycling process across multiple chambers. Concentrated brine from one chamber can be redirected to another chamber that has lower salt concentration, enabling continued recycling without excessive concentration buildup. This allows waste reduction through recycling while maintaining recovery rates by distributing the concentration load across multiple chambers.
Solution Approach 2:
The system implements selective discarding and recovering strategies where moderately concentrated streams are recovered and reused in other chambers, while only highly concentrated brine is discarded. This multi-chamber approach enables extended recycling cycles that reduce waste generation while preventing excessive salt accumulation that would reduce recovery rates.
3Productivity
If multiple feed chambers are implemented with switching mechanism, then process efficiency is maintained, but device complexity increases
Solution Approach 1:
The system uses segmentation into modular feed chambers that can be independently constructed and maintained. Each chamber is a simple unit, but their combination with switching valves creates the multi-chamber system. This modular segmentation resolves the contradiction by keeping individual components simple while achieving complex functionality through their arrangement.
Solution Approach 2:
The feed chambers are designed as universal, multi-functional units that can serve different purposes at different times (processing, cleaning, regeneration). The switching mechanism enables each chamber to perform multiple functions, reducing the need for specialized components and simplifying the overall system design while maintaining high process efficiency.
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 enables the system to handle feed water of different qualities and recovery rates by continuously recycling and cleaning the feed water, reducing waste and maintaining process efficiency by switching between chambers and using desaturation units to manage salt concentrations.
Implementation Method 1
pumping feed water from one of the feed chambers through a reverse osmosis (RO) or nanofiltration (NF) membrane to create a concentrated feed stream and a product water stream
Implementation Method 2
Nanofiltration (NF) is also a semi-permeable membrane filtration-based method that uses nanometer sized cylindrical through-pores
Implementation Method 3
reducing the pressure of the concentrated feed stream
Implementation Method 4
passing the feed stream through a desaturation unit prior to, or after, its passage through the reverse osmosis or nanofiltration
Data Source
AI summary
Disclosed herein is a system for cleaning feed water of variable quality, the system including an inlet for selectively delivering feed water to one or other of at least two feed chambers, each feed chamber having a delivery pipe for delivering feed water to a reverse osmosis or nanofiltration, a pump to deliver the feed water from one of the chambers through its associated delivery pipe to the reverse osmosis or nanofiltration to create a concentrated feed stream and a product water stream, return pipes for selectively returning the concentrated feed stream to one or another of the at least two feed chambers, a product water outlet for removal of the product water, and switching mechanisms and/or switchers for switching the delivery of the concentrated feed stream between the selectable return pipes upon detection of a predetermined reduction in efficiency within one or another of the feed chambers.