PFAS Detoxification System for Semiconductor Waste
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Solution Overview
Problem
Semiconductor manufacturing processes discharge persistent and harmful Per- and Poly-FluoroAlkyl Substances (PFAS), which are difficult to decompose and accumulate in the environment, necessitating an effective detoxification system to prevent their discharge.
Innovation Solution
A PFAS detoxification system comprising a concentrator to concentrate waste liquids, a sulfuric acid processing unit for decomposition and volatilization of the concentrate, and a combustion detoxifying device to burn and detoxify PFAS-containing gases, utilizing a network of filters and circulation paths to manage and recycle components effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional wastewater processing systems are used to treat PFAS-containing waste liquid, then the system can operate with standard processing methods, but the PFAS compounds persist and accumulate in the environment causing harmful effects
Solution Approach 1:
The patent changes the chemical parameters of the waste liquid by adjusting pH to acidic conditions and adding oxidizing agents to transform recalcitrant PFAS compounds into more biodegradable forms, enabling effective decomposition that conventional neutral-pH systems cannot achieve
Solution Approach 2:
The patent employs strong oxidizing agents to accelerate the breakdown of PFAS compounds, converting them into shorter-chain compounds that are more susceptible to biological degradation, thereby overcoming the persistence issue of conventional treatment methods
2Productivity
If the waste liquid is concentrated before treatment, then the treatment efficiency is improved, but the concentration process requires additional equipment and process steps
Solution Approach 1:
The patent combines the concentration function with the existing filtration system by implementing a backflow cleaning mechanism that simultaneously maintains filter performance and concentrates waste liquid, eliminating the need for separate concentration equipment
Solution Approach 2:
The system uses its own filtrate to clean and concentrate the waste liquid through backflow, making the concentration process self-sufficient without requiring external energy input or additional specialized equipment
3Loss of substance
If filters are used to concentrate waste liquid, then the filtrate can be recycled, but the filters become clogged requiring frequent cleaning
Solution Approach 1:
The patent implements periodic backflow cleaning cycles where filtrate flows in reverse through the filter to dislodge and remove accumulated solids, maintaining filter permeability without requiring manual intervention or system shutdown
Solution Approach 2:
The system uses pressure differential feedback across the filter to automatically trigger backflow cleaning when clogging is detected, optimizing the balance between filtration efficiency and maintenance requirements
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 efficiently decomposes and volatilizes PFAS, reducing their environmental impact by converting high molecular weight compounds into lower molecular weight forms, suppressing foaming, and allowing for the recovery of recyclable materials while generating energy through waste heat or steam power.
Implementation Method 1
a concentrator configured to concentrate a waste liquid containing an organic fluorine compound
Implementation Method 2
a chemical liquid processor configured to decompose and volatilize a concentrate concentrated by the concentrator
Implementation Method 3
a chemical liquid processor configured to decompose and volatilize a concentrate concentrated by the concentrator
Implementation Method 4
a combustion detoxifying device to burn and detoxify PFAS-containing gases
Data Source
AI summary
A PFAS detoxification system 1 includes a concentrating device 11 configured to concentrate a resist waste liquid containing PFAS discharged from a lithography apparatus 111 of a semiconductor manufacturing apparatus 100. Further, the PFAS detoxification system 1 includes a sulfuric acid processing tub 12 configured to decompose and volatilize a concentrate concentrated by the concentrating device 11.