Freeze-Thaw Aggregation for Nano-Sized Microplastic Water Analysis
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Solution Overview
Problem
Existing methods struggle to effectively separate and analyze nano-sized microplastic particles from water systems, as they cannot be filtered by conventional filters and require additional coagulants that may interfere with analysis results.
Innovation Solution
A method involving freezing and thawing water containing microplastic particles to form aggregates, which are then analyzed without additional coagulants, using techniques like FTIR and Raman spectroscopy to determine size, number, and type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filters are used to separate microplastic particles, then particles with sizes of several micrometers or more can be separated, but nano-sized microplastic particles cannot be separated
Solution Approach 1:
The patent changes the physical state parameter of water between frozen and thawed states to enable separation of nano-sized microplastic particles. By freezing water and then thawing it, the patent creates aggregate formation that allows conventional filters to capture particles across a broader size range including nano-sized particles that would otherwise pass through.
2Productivity
If additional coagulants are used to separate nano-sized microplastic particles, then separation efficiency improves, but analysis accuracy deteriorates due to coagulant interference
Solution Approach 1:
The patent extracts and removes the need for additional coagulants by utilizing the natural freezing and thawing process of water itself. The phase change of water creates sufficient aggregation effect without introducing any foreign chemical substances, thereby maintaining analysis accuracy while achieving effective separation of nano-sized particles.
Solution Approach 2:
The patent employs the water system's own physical properties (freezing and thawing) to achieve particle aggregation and separation. The water acts on itself through phase changes, eliminating the need for external coagulants and avoiding any interference with subsequent analysis of the microplastic particles.
3Reliability
If freezing and thawing is performed multiple times to improve aggregation, then separation effectiveness increases, but process complexity increases
Solution Approach 1:
The patent employs periodic freezing and thawing cycles to progressively improve particle aggregation. By repeating the freeze-thaw process multiple times, particles are gradually aggregated into larger clusters that can be effectively filtered, with each cycle building upon the previous one to enhance separation effectiveness.
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 method allows for accurate separation and analysis of microplastic aggregates with simplified equipment and process, enabling precise qualitative and quantitative assessment of microplastic particles, and purification of water without coagulant interference.
Implementation Method 1
freezing and thawing the to-be-treated water at least once to generate microplastic aggregates
Implementation Method 2
freezing and thawing the to-be-treated water at least once to generate microplastic aggregates
Implementation Method 3
generate microplastic aggregates in the to-be-treated water
Data Source
Figure 1~3
Figure 4~5A
Figure 5B~6A
AI summary
Proposed is a method of analyzing microplastic particles in a water system. The method includes providing to-be-treated water containing microplastic particles, freezing and thawing the to-be-treated water at least once to generate microplastic aggregates in the to-be-treated water, recovering the microplastic aggregates, and analyzing the recovered microplastic aggregates. According to the method, the microplastic particles are precipitated in the water system without the use of an additional coagulant, whereby the effect of coagulants on the subsequently recovered microplastic aggregates may be ruled out. In addition, the process configuration is simple because the aggregates can be separated from the supernatant without using any additional treatment process.