Microplastic compactor and method of compacting microplastics
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Solution Overview
Problem
Current washing machine filters and wastewater treatment plants are ineffective in removing microplastics, particularly microfibers, from effluent due to clogging issues and lack of automated disposal solutions, leading to environmental contamination.
Innovation Solution
A compactor system that extracts and compresses microplastics from waste effluent using moveable plates and a drive unit, allowing for automatic discharge of compressed microplastics, minimizing user intervention and preventing environmental release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mesh filters are used to stop microfibers, then microfiber collection effectiveness is improved, but the filter clogs quickly causing pressure drop and flow rate reduction
Solution Approach 1:
The filter is divided into multiple layers with different aperture sizes. The first layer has larger apertures (100-500 μm) to capture large debris while maintaining high flow rate, the second layer has medium apertures (10-50 μm) to capture microfibers, and the third layer has smaller apertures (1-10 μm) to capture fine particles. This segmentation allows each layer to perform its specific function without clogging the entire filter system.
Solution Approach 2:
Different regions of the filter have different aperture sizes tailored to specific filtration needs. The first layer uses larger apertures where high flow rate is critical, the second layer uses medium apertures where microfiber capture is prioritized, and the third layer uses smaller apertures where fine particle removal is needed. This local quality variation optimizes both flow rate and filtration effectiveness at different stages.
2Manufacturing precision
If mesh filters with small apertures are used to capture microfibers, then filtration precision is improved, but the filter clogs quickly requiring frequent manual cleaning
Solution Approach 1:
The system uses the pump's existing reverse flow capability to automatically clean the filter. During the reverse flush cycle, the pump reverses direction and forces clean water through the filter in the opposite direction, dislodging and flushing accumulated debris from the filter layers. This self-cleaning mechanism eliminates the need for manual disassembly and cleaning of the filter.
Solution Approach 2:
The filter cleaning is performed periodically through reverse flush cycles rather than requiring continuous manual intervention. The system alternates between normal filtration mode and reverse flush cleaning mode, with the cleaning cycle occurring at predetermined intervals or when pressure differential indicates clogging. This periodic action maintains filtration precision while minimizing maintenance burden.
3Reliability
If secondary level water treatment is used, then microplastic removal is improved, but the small proportion that escapes still equates to tens of millions of fibres per treatment works per day
Solution Approach 1:
The filtration system is segmented into three distinct layers with progressively smaller apertures. The first layer (100-500 μm) removes large debris, the second layer (10-50 μm) captures microfibers, and the third layer (1-10 μm) removes fine particles. This multi-stage segmentation ensures that microfibers are captured in the second layer while the third layer provides a safety net for any smaller particles that escape, dramatically reducing the remaining microfiber load in the effluent.
Solution Approach 2:
The multi-layer filter structure acts as an intermediary between the raw effluent and the final discharge. Each layer serves as a intermediate filtration stage, progressively removing particles of different sizes. The second layer specifically targets microfibers while the third layer provides additional refinement, ensuring that very few microfibers pass through to the discharge.
4Ease of operation
If a compactor system is added to compress and automatically discharge microplastics, then disposal convenience is improved, but device complexity increases
Solution Approach 1:
The compactor system merges multiple functions into a single integrated unit: the filter structure, the compression mechanism, and the discharge system are combined into one device. The filter layers are positioned within the compactor chamber, and the pump serves dual purposes for both normal operation and reverse flush cleaning. This merging reduces the need for separate components and simplifies overall system architecture.
Solution Approach 2:
The pump is designed with multi-functionality, serving both as the primary drive for water circulation during normal filtration and as the reverse flush mechanism for automatic filter cleaning. The compactor chamber serves both as the filtration medium housing and as the compression chamber. This multi-functionality reduces the total number of components needed and simplifies the overall device complexity.
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 compactor effectively separates and compresses microplastics into a solid form, enabling convenient and environmentally responsible disposal, reducing the burden on users and improving the efficiency of wastewater treatment by preventing microplastic contamination.
Implementation Method 1
a permeable element to allow waste water to escape from the chamber during the compression phase
Implementation Method 2
the inlet includes a one-way valve to prevent waste effluent from escaping out of the inlet during the compression phase
Data Source
Figure 1
Figure 2A~2B
Figure 3a~3b
AI summary
The invention relates to preventing microplastics from entering the environment. The invention is directed to filtering and compacting microplastics from any effluent, but in particular to filtering and compacting microfibers from the wastewater of washing machines and other appliances. However, the invention may also be applied in any industry where microparticles are generated, e.g. the industrial manufacture of textiles, or in treating roadside runoff, or where microparticles are handled, e.g. in Waste Water Treatment Plants. The invention is a compactor for automatically extracting and compressing microplastics from waste effluent, the compactor comprising; a chamber with an inlet; at least one plate within the chamber moveable between a non-compressing position and a compressing position, and a drive unit for driving the at least one plate; and a discharge outlet arranged to allow the automatic discharge of compressed microplastics.