Hybrid Filter Assembly With Segmented Membrane Stages
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Solution Overview
Problem
Traditional pool and spa filtration systems struggle to effectively capture both large and small contaminants without clogging, and they require inefficient backwashing methods that may not remove all contaminants and can be wasteful.
Innovation Solution
A hybrid filter assembly with a two-stage filtration system, comprising a first granular media filtration stage and a second membrane filtration stage with nanofiltration and ultrafiltration modules, along with a valve system and controller for targeted cleaning and fluid isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-stage filters are used to capture small contaminants, then filtration efficiency improves, but the filter clogs quickly requiring frequent cleaning
Solution Approach 1:
The filter system is divided into two distinct stages: a first stage with granular media (sand, glass beads, or gravel) that captures large suspended solids, and a second stage with membrane filtration (hollow fiber, RO, or SiC) that captures submicron particles and microorganisms. This segmentation allows each stage to handle the particle size range it is optimized for, preventing the membrane from clogging with large particles while still achieving high-efficiency filtration of small contaminants.
2Reliability
If multiple separate filters are used to remove particles of varying sizes, then filtration effectiveness improves, but system complexity and space requirements increase
Solution Approach 1:
The patent combines two separate filtration stages into a single integrated filter housing. The first stage granular media filter and second stage membrane filter are positioned sequentially within the same vessel, with water flowing from the first stage through to the second stage. This merging eliminates the need for separate filter housings, individual piping systems, and multiple valve systems, while maintaining the effectiveness of multi-stage filtration.
3Reliability
If backwashing is performed on the entire filter system, then all components are cleaned, but water and energy are wasted cleaning components that do not need cleaning
Solution Approach 1:
The valve system is segmented to control flow to individual filtration stages independently. During backwashing, the controller can isolate the membrane filtration stage and backwash only the granular media first stage, or isolate the granular media stage and backwash only the membrane second stage. This allows selective cleaning of only the fouled component, wasting no water or energy cleaning components that do not need it.
Solution Approach 2:
The system dynamically adjusts valve positions based on real-time monitoring of pressure differential across each stage. When the pressure differential across the membrane stage exceeds a threshold, the system automatically directs backwash flow to only that stage. This dynamic response ensures cleaning is applied only when and where needed, optimizing water and energy usage.
4Ease of operation
If backwashing is delayed until the entire system needs cleaning, then cleaning operations are simplified, but the overall lifetime of the filter system is reduced
Solution Approach 1:
The controller continuously monitors pressure differential across each filtration stage and dynamically determines when backwashing is needed for each stage independently. When the pressure differential across either stage exceeds its respective threshold, the system automatically initiates backwashing for that specific stage. This dynamic monitoring and independent backwashing of each stage extends the overall system lifetime by preventing fouling accumulation, while maintaining simple automated operation.
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 hybrid filter assembly efficiently captures contaminants of various sizes in a single pass, reduces the formation of disinfection by-products, and allows for targeted cleaning to extend the lifespan of filter components, thereby improving water clarity and safety.
Implementation Method 1
The first filtration stage includes a granular media, and the second filtration stage includes a first membrane filtration module and a second membrane filtration module
Implementation Method 2
high-efficiency filter media technology capable of capturing submicron particles and microorganisms
Implementation Method 3
The valve system is designed to selectively control fluid flow within the second filtration stage
Implementation Method 4
traditional filter systems can be cleaned through backwash operations where the flow of water is reversed through the system to loosen and remove trapped particulates
Data Source
AI summary
A hybrid filter assembly for an aquatic application is provided in the form of a first filtration stage, a second filtration stage in fluid communication with the first filtration stage, a valve system in fluid communication with the second filtration stage, and a controller. The first filtration stage includes a granular media, and the second filtration stage includes a first membrane filtration module and a second membrane filtration module. The valve system is designed to selectively control fluid flow within the second filtration stage. The controller, which is in communication with the valve system, is designed to direct actuation of the valve system to fluidly isolate the first membrane filtration module from the second membrane filtration module.