Superoxide Anion Soil Remediation via Hydrogen Peroxide and Hydroxide Reaction
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Solution Overview
Problem
Current in-situ technologies for soil remediation, such as chemical oxidation, face challenges with efficiency, pH control, heat management, and corrosion issues when dealing with complex contaminants like petroleum products and non-halogenated aromatic hydrocarbons, requiring a more effective and rapid treatment method.
Innovation Solution
A process involving the in-situ generation of a superoxide anion by reacting sodium or potassium hydroxide with hydrogen peroxide, creating an aqueous solution with a preferred molar ratio of hydrogen peroxide to hydroxide above 1.1:1, which is injected into contaminated soil to rapidly oxidize and mineralize complex contaminants like petroleum products and aromatic hydrocarbons, while minimizing corrosion to existing infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If in-situ chemical oxidation is used to treat complex contaminants like petroleum products and aromatic hydrocarbons, then the treatment can be performed in place with less disruption, but the process is slow (days to weeks) and requires pH control and heat management
Solution Approach 1:
The invention changes the chemical parameters by using a specific molar ratio of hydrogen peroxide to hydroxide (above 1.1:1) to generate superoxide anions, which dramatically accelerates the oxidation rate while maintaining in-situ treatment advantages
Solution Approach 2:
The invention combines hydrogen peroxide and hydroxide source in a specific composite aqueous solution to create a synergistic effect that generates superoxide anions, achieving both rapid treatment and in-situ applicability
2Ease of operation
If conventional in-situ oxidation methods are applied to complex hydrocarbon contaminants, then treatment can be performed on-site, but the oxidation process requires extensive pH control and generates uncontrolled heat and gas production
Solution Approach 1:
The invention operates at ambient conditions without requiring pH control by using the specific reaction between hydrogen peroxide and hydroxide that generates superoxide anions, eliminating the need for complex control systems while maintaining in-situ treatment capability
Solution Approach 2:
The invention uses a disposable aqueous solution of hydrogen peroxide and hydroxide that reacts rapidly and completely, eliminating the need for complex control infrastructure and making the system simpler and more adaptable for field deployment
3Productivity
If strong oxidizing agents are used to rapidly destroy contaminants, then treatment time is reduced, but corrosion to existing metal infrastructure increases
Solution Approach 1:
The invention changes the oxidizing mechanism from direct strong oxidant contact to superoxide anion generation through hydrogen peroxide and hydroxide reaction, achieving rapid contaminant destruction while the alkaline environment protects metal infrastructure from corrosion
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 achieves rapid and complete mineralization of contaminants, with high conversion rates within minutes to hours, and minimal corrosion to metal surfaces, offering a more efficient and environmentally friendly solution for soil remediation compared to existing technologies.
Implementation Method 1
reacting sodium or potassium hydroxide with hydrogen peroxide under ambient conditions has been recently reported
Implementation Method 2
The superoxide radical anion (O2-•) is an active oxygen species that possesses both anionic and free radical properties. It has been shown in the abovementioned publications that this reagent displays properties of a super oxidizing agent.
Implementation Method 3
inducing electroosmotic flow of the pore fluid and the electromigration of charged ions toward the electrode of opposite charge
Implementation Method 4
Electrokinetic (EK) and electrochemical remediation is the application of a low electric potential or direct current to electrodes inserted into the soil
Data Source
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AI summary
The invention provides a process for treating a soil contaminated with a pollutant selected from the group consisting of petroleum products and aromatic hydrocarbons, comprising bringing into contact with said soil an aqueous solution in which hydrogen peroxide and hydroxide source are combined.