Rotating Suction Filter for Managing Headloss in Water Filtration
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Solution Overview
Problem
Current water filtration systems face challenges in efficiently managing headloss and solids loading, particularly in municipal and industrial applications, where effective backwashing and sludge removal are critical for maintaining filtration efficiency and minimizing operational disruptions.
Innovation Solution
The described water filtration system incorporates a tank with disc-shaped filters, a rotating shaft, and suction bars with specific geometries to manage headloss and solids loading, utilizing a backwash cleaning cycle and sludge withdrawal system to maintain filter efficiency and facilitate easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous filtration operation is maintained, then productivity is improved, but headloss and solids loading accumulate causing filtration efficiency to deteriorate
Solution Approach 1:
The patent implements periodic backwashing cycles where the filter media is reversed and flushed to remove accumulated solids. This periodic cleaning action resets the filtration capacity, allowing continuous operation while maintaining filtration efficiency by periodically removing headloss and solids loading.
Solution Approach 2:
The system discards accumulated solids and sludge from the filter media through backwashing and sludge withdrawal mechanisms. By removing these harmful accumulations, the system recovers filtration efficiency and maintains productive continuous operation without permanent degradation.
2Reliability
If backwashing is performed to remove solids loading, then filtration efficiency is improved, but operational disruptions occur reducing productivity
Solution Approach 1:
The filter bed is segmented into multiple zones or layers that can be backwashed independently or in sequence. This segmentation allows partial backwashing that maintains filtration in active zones while cleaning others, reducing operational disruption while still improving overall filtration efficiency.
Solution Approach 2:
The system maintains continuous useful filtration action during backwashing by using multiple filter beds in parallel or by rapidly cycling between zones. While one zone is being backwashed, other zones continue filtering, ensuring productivity is maintained with minimal operational disruption.
3Reliability
If sludge withdrawal is implemented to manage solids loading, then filtration efficiency is maintained, but device complexity increases
Solution Approach 1:
The sludge withdrawal system is designed to operate automatically based on predetermined criteria such as headloss thresholds or time-based schedules. This self-service capability maintains filtration efficiency through automated sludge removal without requiring complex manual control systems or continuous monitoring infrastructure.
Solution Approach 2:
A simple intermediary mechanism such as a differential pressure sensor or timer mediates between the filtration process and sludge withdrawal action. This intermediary triggers backwashing or sludge removal only when necessary, maintaining filtration efficiency while avoiding the complexity of continuous active sludge withdrawal systems.
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 system effectively manages headloss and solids loading, ensuring continuous filtration operation by implementing a backwash cleaning cycle and sludge removal mechanism, thereby maintaining filtration efficiency and reducing operational disruptions.
Implementation Method 1
a suction bar (180) configured to remove solids from an external surface of the filter
Implementation Method 2
The system effectively manages headloss and solids loading, ensuring continuous filtration operation by implementing a backwash cleaning cycle
Data Source
AI summary
An apparatus for filtering liquid that includes a filter having an external surface; a rotatable shaft extending through the filter; and a movable member coupled to the rotatable shaft. The movable member is configured to impart a suction force at various locations across the external surface of the filter. The movable member has a trailing portion that extends further than the leading portion in the direction toward the filter.