Injectable Oxidant Gel Beads for Groundwater Remediation
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Solution Overview
Problem
Existing technologies face challenges in achieving controlled and sustained release of oxidants in environmental remediation applications, particularly in groundwater and soil, which is essential for effectively degrading contaminants like perchloroethylene.
Innovation Solution
A composite material comprising a polymer capable of cross-linking in the presence of water and an oxidant, which forms a viscous gel upon mixing and water addition, allowing for a sustained release of the oxidant into the environment. This material can be deployed via hydraulic injection or placement in wells and boreholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If oxidant is applied as powder, then immediate oxidation occurs, but release duration is short
Solution Approach 1:
The patent uses composite materials by combining oxidant (potassium permanganate) with polymer materials (such as polyvinyl alcohol, carboxymethyl cellulose, or starch) to form gel beads or capsules. This composite structure allows the oxidant to be released gradually over time as the polymer matrix degrades or swells, extending the release duration from hours to weeks or months while maintaining ease of application through hydraulic injection or well placement.
Solution Approach 2:
The patent changes the physical and chemical parameters of the oxidant delivery system by transforming it from a free powder state to an encapsulated or gel-bound state. This involves controlling parameters such as polymer concentration, cross-linking degree, particle size, and gel formation conditions to achieve the desired release kinetics. The parameter changes enable sustained release without significantly complicating the application process.
2Duration of action of moving object
If oxidant is released quickly, then contaminant degradation is rapid, but release duration is insufficient
Solution Approach 1:
The patent implements periodic action through controlled-release mechanisms where the oxidant is released in a time-dependent manner. The polymer matrix provides a structured release pattern that maintains effective oxidant concentrations over extended periods, allowing continuous contaminant degradation throughout the treatment zone rather than a single rapid pulse that depletes quickly.
Solution Approach 2:
The patent achieves continuity of useful action by designing the gel or capsule system to provide sustained oxidant release over weeks or months. The polymer matrix continuously releases oxidant as it degrades or swells, maintaining a continuous presence of active oxidizing agents in the groundwater or soil, thereby ensuring uninterrupted contaminant degradation throughout the remediation period.
3Stability of the object's composition
If polymer cross-linking is enhanced, then gel structure is more stable, but oxidant release may be restricted
Solution Approach 1:
The patent applies local quality by creating regions of different cross-linking densities within the gel or capsule structure. The polymer matrix contains localized areas with varying degrees of cross-linking, allowing regions closer to the oxidant to have different permeability and degradation rates than outer regions. This gradient structure enables both structural stability and adequate oxidant release by balancing retention and delivery zones within the same material.
Solution Approach 2:
The patent introduces dynamics into the gel structure by using polymers that can change their physical state or permeability in response to environmental conditions such as moisture, pH, or temperature. The gel matrix dynamically adjusts its structure during oxidant release, transitioning from a tightly cross-linked stable state to a more open state that facilitates oxidant diffusion, thereby maintaining both stability and release capability throughout the treatment process.
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 composite material achieves a significantly longer release duration of oxidants compared to powdered forms, with measurable concentrations of potassium permanganate persisting for several months, effectively degrading contaminants like perchloroethylene in groundwater.
Implementation Method 1
a polymer capable of cross-linking in the presence of water
Implementation Method 2
forms a viscous gel upon mixing and water addition
Implementation Method 3
effectively degrading contaminants like perchloroethylene in groundwater
Data Source
AI summary
Certain exemplary embodiments can provide a composition of matter adapted for and/or resulting from, a method that can comprise and/or relate to, activities comprising treating contaminated groundwater via mixing a polymer with a cross-linking agent and/or an oxidant and delivering the mixture to contaminated groundwater to form an in situ controlled-release composition.