Filter Module Design for Reverse Osmosis Fouling Reduction
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Solution Overview
Problem
Current reverse osmosis systems face challenges with biofilm fouling, leading to reduced permeate capacity and contamination risks, requiring costly and energy-intensive disinfection and membrane exchanges, which are inconvenient and costly, especially in medical applications.
Innovation Solution
A filter module design with a pressure pipe and membrane featuring connections on one end, an open annular space for fluid flow, and a functional/connection unit with all connections on the upper part, allowing for easy assembly and disassembly without dead spaces, reducing fouling risks and simplifying membrane exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If membrane exchange is performed in conventional reverse osmosis systems, then membrane replacement is possible, but the system requires complete disassembly with tools, causing long standstill times and high operational costs
Solution Approach 1:
The filter module is divided into separable components: a membrane element and a pressure pipe assembly. The membrane element can be independently removed and replaced by simply pulling it out of the pressure pipe, without requiring disassembly of the entire module or use of tools. This segmentation enables rapid membrane exchange while maintaining system integrity.
Solution Approach 2:
The membrane element is designed as a separate, extractable component that can be removed from the pressure pipe by simple pulling action. This extraction mechanism eliminates the need for complex disassembly procedures and allows quick replacement of the membrane element to restore system functionality.
2Stability of the object's composition
If conventional tripartite filter modules are used, then structural stability is maintained, but dead spaces are created that promote biofilm formation and fouling
Solution Approach 1:
The design eliminates dead spaces and stagnant flow regions that previously promoted biofilm formation. By ensuring continuous fluid flow through all components and eliminating pockets where water could stagnate, the design converts a previously harmful structural feature into a beneficial flow-through configuration that prevents fouling while maintaining structural stability.
3Productivity
If chemical disinfection is performed to remove biofilm, then permeate capacity is restored, but the process requires interrupting normal operation and uses costly chemical agents
Solution Approach 1:
The design prevents biofilm formation in the first place by eliminating dead spaces and ensuring continuous fluid flow throughout the module. This preliminary preventive action avoids the need for subsequent chemical disinfection processes, maintaining both productivity and operational simplicity without requiring chemical agents or operational interruptions.
4Reliability
If thermal disinfection is used to reduce germs, then some sanitation is achieved, but energy consumption increases and biofilm removal is ineffective
Solution Approach 1:
The design eliminates the conditions that require thermal disinfection by preventing biofilm formation through continuous flow and elimination of dead spaces. This converts the need for high-energy thermal processing into a low-energy passive flow design that maintains sanitation effectiveness without significant energy input.
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 design minimizes fouling, reduces the need for frequent disinfection, and simplifies membrane replacement, enhancing system hygiene and reducing operational costs and downtime, particularly beneficial for medical and food-technological applications.
Implementation Method 1
the water to be treated is passed in a filter module under pressure along the surface of a semipermeable membrane, wherein part of the water, the so-called permeate, passes through the membrane
Data Source
AI summary
A filter module comprising a pressure pipe and a membrane disposed therein, having connections for a fluid to be fed, preferably untreated water, and for filtrate and retentate to be discharged, characterized by a functional/connection unit which is fastened in one end of the pressure pipe and has an upper part and a lower part, wherein all of the connections are provided on the upper part, and flow ducts which are in communication with the connections pass through the lower part, wherein the pressure pipe and the membrane have provided thereinbetween an open annular space through which the fed fluid flows to the bottom side of the membrane, and wherein the pressure pipe has a closed bottom.