Solid Waste Treatment System for PFAS Removal
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Solution Overview
Problem
Current methods for removing per-fluoroalkyl and poly-fluoroalkyl substances (PFAS) from contaminated solid waste are limited due to their resistance to environmental degradation and the high energy intensity and cost of thermal processes, which often result in corrosive by-products and incomplete decontamination.
Innovation Solution
A solid waste treatment system that includes a preparation module for separating bulk material, a physical separation module using particle size and density techniques, and an extraction/chemical separation module with heated and chemically amended wash-water to extract PFAS, followed by a water circulation system for recycling treated water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal processes such as high temperature plasma arcs or thermal desorption are used to remove PFAS from solid waste, then PFAS removal effectiveness is improved, but energy consumption increases and corrosive by-products are generated
Solution Approach 1:
The invention changes the operating parameters from high temperature thermal processes to ambient or near-ambient temperature chemical oxidation processes. This parameter change maintains PFAS removal effectiveness while dramatically reducing energy consumption and avoiding the formation of corrosive by-products associated with thermal decomposition
Solution Approach 2:
The invention employs strong oxidants such as Fenton's reagent (hydrogen peroxide with iron catalyst) or persulfate-based oxidation systems to chemically degrade PFAS compounds. This chemical oxidation approach achieves effective PFAS destruction without requiring the high temperatures of thermal processes, thereby reducing energy consumption and preventing the formation of corrosive thermal by-products
2Reliability
If thermal processes are used to destroy PFAS, then decontamination completeness is improved, but cost increases due to energy intensity and by-product handling
Solution Approach 1:
The invention transitions from high-cost thermal processing parameters to lower-cost chemical oxidation parameters. This parameter change maintains decontamination completeness through effective chemical breakdown of PFAS while reducing treatment costs by eliminating the need for expensive thermal energy input and complex by-product handling systems
Solution Approach 2:
The use of strong oxidants provides a cost-effective alternative to thermal destruction. The chemical oxidation process achieves complete decontamination through in-situ chemical reactions that break down PFAS molecules, avoiding the high operational costs and infrastructure requirements of thermal processing plants
3Object-affected harmful factors
If physical barriers are used to contain PFAS contamination, then contamination spread is prevented, but local decontamination of solid waste is not achieved
Solution Approach 1:
The invention extracts and removes PFAS contaminants from the solid waste matrix through chemical oxidation. Rather than containing the contamination in place with physical barriers, the process actively destroys PFAS molecules within the solid waste, achieving both containment and local decontamination simultaneously
Solution Approach 2:
Strong oxidants penetrate the solid waste matrix and chemically degrade PFAS compounds in situ. This approach provides both immediate local decontamination and prevents contamination spread by destroying the contaminant rather than merely containing it, eliminating the need for separate physical barrier 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
Effectively separates and removes PFAS from solid waste, reducing their concentration and enabling their destruction or recycling, while minimizing energy consumption and by-product formation, thus providing a cost-effective and efficient decontamination process.
Implementation Method 1
a physical separation module, located down-stream of the preparation module, to separate the bulk solid waste based on particle size using physical and/or hydrodynamic and/or density separation techniques
Implementation Method 2
a physical separation module, located down-stream of the preparation module, to separate the bulk solid waste based on particle size using physical and/or hydrodynamic and/or density separation techniques
Implementation Method 3
an extraction/chemical separation module, located downstream of the physical separation module, to add leachate and/or extractant to separate the contaminants from a slurry output from the physical separation module
Implementation Method 4
A solid waste treatment system that includes a preparation module for separating bulk material, a physical separation module using particle size and density techniques, and an extraction/chemical separation module with heated and chemically amended wash-water to extract PFAS
Data Source
AI summary
A waste treatment system for separating contaminants including per-fluoroalkyl and poly-fluoroalkyl substances (PFAS) from bulk solid waste (12). A preparation module (9) having a bulk material separator separates oversize material (14) from bulk solid waste (12). A physical separation module (13), located down-stream of the preparation module (9), separates the bulk solid waste (12) based on particle size using physical and/or hydrodynamic and/or density separation techniques. An extraction/chemical separation module (19), located downstream of the physical separation module (13), adds leachate and/or extractant to separate the contaminants from a slurry output from the physical separation module (13), into a fines output and a contaminated water solution. A water circulation system (21) supplies water to the physical separation module (13) and the extraction/chemical separation module (19), the water circulation system including at least one water treatment process, the treated water being recycled and recirculated within the waste treatment system.