Thermosetting Polymer Waste Solidification Volume Reduction
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Solution Overview
Problem
Current methods for resin and sludge solidification and stabilization, such as the use of cement and bitumen, result in significant volume increases and are often incompatible with hazardous or radioactive wastes, leading to strength issues and safety concerns like fires and steam eruptions, while existing polymers are sensitive to temperature and chemical interactions, limiting their effectiveness.
Innovation Solution
A method involving the use of a thermosetting polymer system with controlled polymerization and high shear mixing to create a continuous polymer matrix that minimizes volume increase, reduces leachability, and prevents rehydration, utilizing a combination of dewatering, drying, and metering to achieve a 70% volume reduction and hydrophobic condition, with automated processes for safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cement is used for resin and sludge solidification, then the process is simple and widely available, but the volume increases three to six times and the product strength decreases due to incompatibility and crumbling
Solution Approach 1:
The patent changes the chemical parameters by using a specialized polymer formulation with specific monomers (divinylbenzene, styrene, methyl methacrylate) and controlled crosslinking density to achieve compatibility with ion exchange resins and sludges, preventing the dehydration-rehydration-crumbing cycle that occurs with cement
Solution Approach 2:
The patent creates a composite material system combining polymer matrix with ion exchange resin and sludge particles, where the polymer provides structural integrity while accommodating the waste materials without the incompatibility issues that plague cement-based systems
2Quantity of substance
If bitumen is used for solidification at elevated temperatures, then higher waste loading per unit volume is achieved, but fire hazards and steam eruptions occur requiring extensive safety systems
Solution Approach 1:
The patent changes the temperature parameter from bitumen's elevated temperature processing to ambient or moderate temperature polymerization, eliminating the fire hazard and steam eruption risks while maintaining high waste loading capacity through the polymer matrix
Solution Approach 2:
The patent uses a disposable polymer formulation that can be rapidly mixed and cured without requiring the extensive fire suppression infrastructure needed for bitumen, accepting the polymer as a consumable material that provides the necessary containment function
3Volume of stationary object
If vinyl ester styrene polymer is used for solidification, then volume increase is limited to 1.6 times and product strength is improved, but the polymer is highly flammable prior to polymerization requiring sophisticated fire suppression
Solution Approach 1:
The patent modifies the polymer formulation parameters by adjusting monomer ratios and incorporating fire retardant additives to reduce the flammability of the uncured polymer while maintaining its solidification effectiveness and volume reduction capabilities
4Volume of stationary object
If in situ polymerization is used for resin solidification, then no volume increase occurs and mixing is simplified, but temperature sensitivity causes premature solidification and intense exotherms create cracking
Solution Approach 1:
The patent changes the polymerization kinetics parameters by using a slower-curing polymer formulation that reduces the exothermic intensity and extends the working time, allowing proper mixing and distribution before solidification begins, thereby preventing premature curing and thermal cracking
Solution Approach 2:
The patent implements a staged polymerization process where mixing and waste addition occur during an active polymerization period, followed by a slower curing period that allows the structure to set without excessive heat generation, creating a periodic cycle of rapid reaction followed by gradual stabilization
5Volume of stationary object
If dewatering and drying processes are applied to achieve volume reduction, then waste volume decreases by 70% and hydrophobic conditions are achieved, but additional processing steps and energy consumption are required
Solution Approach 1:
The patent performs dewatering and drying as preliminary actions before polymer mixing and solidification, reducing the waste volume and moisture content in advance to minimize the final solidified volume and prevent water-related compatibility issues during polymerization
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 method achieves substantial waste volume reduction, stabilization, and safety by minimizing polymer usage, preventing volume expansion upon water exposure, and ensuring a continuous polymer matrix for enhanced strength and reduced leachability, while allowing for flexible container sizes and automated handling to minimize personnel exposure.
Implementation Method 1
A method involving the use of a thermosetting polymer system with controlled polymerization
Implementation Method 2
high shear mixing to create a continuous polymer matrix
Implementation Method 3
utilizing a combination of dewatering, drying, and metering to achieve a 70% volume reduction and hydrophobic condition
Implementation Method 4
drying, and metering to achieve a 70% volume reduction and hydrophobic condition
Data Source
Figure 1
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Figure 3A
AI summary
A method for solidification of a waste material is provided. The method includes removing excess water from the waste material, mixing at least one polymer with the waste material to provide a polymer-waste mixture, and curing the polymer in the polymer-waste mixture to provide a solidified monolith waste form having a continuous polymer matrix encapsulating the waste material.