Supercritical Water Asbestos Waste Treatment
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Solution Overview
Problem
Current methods for treating asbestos-containing waste, especially those with organic matrices, are ineffective due to the decomposition of organic materials leading to toxic byproducts and fiber dispersion, and require large amounts of hazardous reagents.
Innovation Solution
A method involving a supercritical aqueous phase reaction at 600°C to 650°C and 25 to 27 MPa, with the addition of an oxidizing compound like hydrogen peroxide, to stabilize asbestos-containing waste without fiber dispersion and using minimal hazardous reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal treatment at high temperature is applied to destroy asbestos, then asbestos destruction is achieved, but organic matrix decomposes into toxic byproducts
Solution Approach 1:
The patent changes the physical-chemical parameters of the treatment environment by using supercritical water (specific temperature and pressure conditions) instead of conventional thermal treatment. This parameter change allows complete mineralization of both asbestos and organic matrix into harmless substances, eliminating toxic byproducts while maintaining asbestos destruction effectiveness.
Solution Approach 2:
The patent employs supercritical water as a powerful oxidizing agent that can completely oxidize both asbestos minerals and organic matrix materials. This strong oxidation process converts all materials into harmless substances (silica, alumina, water, carbon dioxide), preventing the formation of toxic byproducts while achieving complete destruction.
2Ease of manufacture
If conventional treatment methods are used for organic matrix ACW, then treatment process is simple, but fiber dispersion occurs and treatment is ineffective
Solution Approach 1:
The patent changes the treatment parameters to supercritical water conditions (temperature and pressure), which fundamentally alters the interaction between treatment medium and waste materials. This parameter change enables complete mineralization and prevents fiber dispersion, achieving effective treatment while maintaining operational simplicity through a single reaction step.
Solution Approach 2:
The patent converts the previously harmful organic matrix into a beneficial part of the process by using supercritical water to mineralize it completely. The organic materials that would normally cause treatment failures and fiber dispersion are instead completely oxidized into harmless substances, turning a disadvantage into an advantage for achieving complete destruction.
3Reliability
If hazardous reagents are used to treat ACW, then treatment effectiveness is improved, but reagent hazard and environmental risk increase
Solution Approach 1:
The patent employs water as the treatment medium, which is inherently safe and environmentally benign. The supercritical water system uses only water and oxygen from air, eliminating the need for hazardous chemical reagents. The process is self-sustaining, requiring no external chemical additives, thus achieving effective treatment while completely eliminating reagent hazard and environmental risk.
Solution Approach 2:
The patent uses supercritical water as a natural strong oxidant that can mineralize all waste materials without requiring added hazardous reagents. The oxidation process uses only water and atmospheric oxygen, converting all asbestos and organic matrix into harmless substances while maintaining treatment effectiveness and eliminating chemical hazard.
4Reliability
If large amounts of reagents are used for ACW treatment, then treatment completeness is achieved, but cost and environmental burden increase
Solution Approach 1:
The patent uses water and atmospheric oxygen as the only reagents, which are abundant and free resources. The supercritical water system requires no external chemical additives, eliminating reagent consumption costs and environmental burden while achieving complete mineralization of all waste materials.
Solution Approach 2:
The patent employs supercritical water as a powerful natural oxidant that can mineralize all asbestos and organic matrix materials without requiring large amounts of chemical reagents. The process uses only water and air oxygen, achieving complete destruction while minimizing substance loss and environmental impact.
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 effectively stabilizes asbestos-containing waste by inertizing it, regardless of asbestos concentration or type, and organic matrix composition, without fiber dispersion and using less hazardous reagents, achieving complete destruction of both asbestos and organic matrices in one cycle.
Implementation Method 1
allowing the asbestos contained in the asbestos-containing waste to react with the aqueous phase for a time t in an appropriate reactor at predetermined pressure P and temperature T to maintain the aqueous phase in supercritical conditions
Implementation Method 2
at least one oxidizing compound is added in a predetermined concentration C to the aqueous phase being supplied to the reactor for treatment of mainly organic matrix ACW
Implementation Method 3
reaction of asbestos and the primarily organic matrix with the supercritical aqueous phase
Implementation Method 4
at least one oxidizing compound is added in a predetermined concentration C to the aqueous phase being supplied to the reactor for treatment of mainly organic matrix ACW, said pressure P being in a range from 25 to 27 MPa and said temperature T being in a range from 600°C to 650°C, for asbestos and the organic matrix to be simultaneously destroyed
Implementation Method 5
cooling and condensing the aqueous phase flowing out of the reactor
Data Source
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AI summary
Method for destroying asbestos in mainly organic matrix asbestos-containing waste (ACW), which comprises, according to claim 1 , the steps of: preparing the asbestos-containing waste; preparing a supercritical aqueous phase; allowing asbestos and the primarily organic matrix of the asbestos-containing waste to react with the aqueous phase for a time t in an appropriate reactor at predetermined pressure P and temperature T to maintain the aqueous phase in supercritical conditions; cooling and condensing the aqueous phase flowing out of the reactor; separating said aqueous phase from any entrained solid product therein. The method is characterized in that the step in which the supercritical aqueous phase is prepared comprises an additional step in which at least one oxidizing compound is added in a predetermined concentration C1 and in that the pressure P is in a range from 25 to 27 MPa and the temperature T is in a range from 6000C to 650°C, for asbestos and the organic binder to be simultaneously destroyed.