Modular Membrane Stack for Desalination Leakage Prevention
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Solution Overview
Problem
Membrane-based desalination systems face challenges in constructing long stacks due to leakage and buckling issues, as increased compression force required to prevent leakage can exceed the compressive strength of membranes, leading to structural damage and increased leakage.
Innovation Solution
A modular apparatus with rigid end plates and dowel systems is used to compress and stabilize membrane stacks, allowing for lower compressive force per module and preventing membrane failure, while also simplifying assembly and handling by dividing the stack into smaller modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If increased compression force is applied to prevent leakage in long membrane stacks, then leakage is reduced, but membrane structural integrity deteriorates due to exceeding compressive strength
Solution Approach 1:
The membrane stack is divided into multiple modular units, each with its own rigid end plates and compression system. This segmentation allows each module to be independently compressed to appropriate force levels, preventing the cumulative compression force from exceeding membrane strength limits while still ensuring leakage prevention in each segment.
2Productivity
If membrane stacks are made longer to increase desalination capacity, then productivity increases, but structural stability deteriorates due to buckling and leakage issues
Solution Approach 1:
The stack is segmented into multiple modular units that can be connected in series. Each module maintains structural stability through its own rigid end plates and compression system, allowing the overall stack to achieve high productivity through increased length without compromising the stability of individual sections.
Solution Approach 2:
Rigid end plates are introduced as three-dimensional structural elements that provide dimensional stability to the membrane stack. These end plates create a rigid framework that prevents buckling and maintains structural integrity, enabling longer stacks to achieve high productivity without sacrificing stability.
3Ease of operation
If modular design with rigid end plates is implemented, then ease of assembly and handling improves, but device complexity increases due to additional components
Solution Approach 1:
The system is divided into standardized modular units with identical rigid end plates and internal structures. This segmentation enables pre-fabrication and off-site assembly of individual modules, which can then be easily transported and connected on-site, improving ease of operation despite the increased number of components.
Solution Approach 2:
The rigid end plates and modular design create universal, interchangeable components that serve multiple functions: structural support, compression application, alignment guidance, and connection interfaces. This multi-functionality reduces the need for specialized components, making the increased device complexity manageable through standardization.
Data Source
AI summary
The present disclosure is directed at a modular apparatus for a saltwater desalinating system, and a method for using same. The apparatus includes multiple internal modules that are compressively coupled to each other. Each of the internal modules includes a pair of rigid end plates located at opposing ends of the internal module, and a stack of membrane bounded compartments that are layered from one of the end plates to the other. The modular apparatus can be used in a membrane based desalination system, which includes concentration difference energy systems, electrodialysis reversal systems, and membrane distillation systems. The modular apparatus helps to mitigate problems such as leakage and buckling in such systems, and can be used to increase membrane packing density and, accordingly, desalination efficiency.