Parallel Cross-Flow Membrane Units for Continuous Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ultrafiltration (UF) and microfiltration (MF) systems are energy-intensive and prone to membrane fouling due to suspended solids, which leads to downtime during cleaning procedures, disrupting continuous filtration operations.
Innovation Solution
A system comprising two cross-flow membrane units connected in parallel, allowing for concurrent filtration and cleaning using forward and back flushing paths, with control valves and pumps to manage retentate and permeate flow, enabling continuous operation while cleaning the membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If membrane cleaning procedures are performed to address UF/MF membrane fouling, then membrane performance is improved, but system downtime increases and continuous filtration operations are disrupted
Solution Approach 1:
The system divides the membrane filtration process into two separate but parallel units: a first cross-flow membrane unit dedicated to filtration and a second cross-flow membrane unit dedicated to cleaning operations. This segmentation allows each unit to perform its specific function independently, enabling continuous operation where one unit filters while the other cleans, thereby eliminating downtime without compromising membrane performance
Solution Approach 2:
The system implements continuous useful action by operating the first membrane unit for filtration while simultaneously operating the second membrane unit for cleaning. The parallel configuration ensures that filtration operations never stop, as the cleaning unit prepares membranes for future use while the filtration unit maintains continuous suspended solids removal, thus eliminating system downtime while maintaining membrane performance
2Reliability
If conventional membrane cleaning is performed, then membrane fouling is reduced, but filtration operations must be interrupted
Solution Approach 1:
The system segments the overall process into independent filtration and cleaning subsystems operating in parallel. The first cross-flow membrane unit handles filtration continuously while the second cross-flow membrane unit performs cleaning operations independently. This segmentation allows both filtration throughput and membrane cleanliness to be maintained simultaneously without interruption to production
Solution Approach 2:
The system uses a shared retentate recirculation system as an intermediary that serves both filtration and cleaning functions. The retentate pump and associated valves can direct flow to either the filtration unit or the cleaning unit as needed, enabling seamless transition between operations and maintaining continuous filtration throughput while ensuring membrane cleanliness through dedicated cleaning cycles
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 enhances the operational reliability and efficiency of UF/MF systems by allowing continuous filtration of suspended solids while simultaneously cleaning the membranes, reducing energy usage and downtime.
Implementation Method 1
Ultrafiltration (UF) or microfiltration (MF) is used for filtering suspended solids from a feed fluid to produce a concentrated suspended solids stream and a clarified permeate
Implementation Method 2
first and second retentate channels for receiving a retentate with at least some of the filtered suspended solids and first and second permeate channels for receiving a permeate from filtering the suspended solids
Data Source
AI summary
A method for filtering suspended solids from a feed fluid involves filtering the feed fluid by pumping the feed fluid through a first retentate channel of a first cross-flow membrane unit and through a second retentate channel of a second cross-flow membrane unit that is connected in parallel with the first membrane unit. The retentate exiting the units after filtering is pumped through a suspended solids concentrating path. While the filtering is being performed by both membrane units, at least one of the membrane units may be cleaned by performing a forward flush on it in which a portion of the retentate from at least one of the first and the second retentate channels is drawn into a forward flushing path. The forward flushing path is fluidly connected to the retentate channel of the membrane unit that is being forward flushed.