In-situ Chemical Oxidation Injection Optimization for Soil Remediation
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Solution Overview
Problem
Current in-situ chemical oxidation remediation methods for soil and groundwater face challenges in optimizing hole distribution parameters and agent dosing ratios due to insufficient contamination data, particularly in complex organic contamination plots, leading to inefficiencies and increased costs.
Innovation Solution
An in-situ chemical oxidation high pressure injection optimization method involving field tests to determine diffusion radii, injectability parameters, and refined partitioning of injection points, combined with density-increased supplementary investigations to optimize agent dosing ratios and grouting amounts, using a persulfate-based solution and liquid alkali activator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional in-situ chemical oxidation remediation is used without optimization, then the remediation process can be implemented, but the agent dosing ratio is excessive and costs increase
Solution Approach 1:
The patent performs density-increased supplementary investigation and field tests before remediation to determine diffusion radii and injectability parameters. This preliminary characterization of contamination distribution and soil properties enables optimized agent dosing ratios that reduce waste while ensuring effective remediation coverage.
Solution Approach 2:
The patent divides the remediation area into different concentration partitions based on contamination distribution characteristics. Each partition receives tailored agent dosing ratios and injection parameters matched to its specific contamination level and soil properties, avoiding uniform over-dosing and reducing overall agent consumption and costs.
2Reliability
If uniform agent dosing is applied across the entire site, then implementation is simple, but it fails to account for spatial variations in contamination and soil properties reducing remediation effectiveness
Solution Approach 1:
The patent implements spatially variable agent dosing ratios and injection parameters matched to local contamination concentrations and soil injectability characteristics. This localized optimization ensures each area receives the precise treatment needed for effective remediation while accounting for heterogeneity in contamination distribution and ground conditions.
Solution Approach 2:
The patent segments the remediation site into multiple concentration partitions based on contamination distribution. Each partition is designed with specific dosing ratios and injection parameters, transforming a complex uniform dosing problem into manageable localized treatment zones that can be optimized independently.
3Manufacturing precision
If density-increased supplementary investigation is conducted to obtain detailed contamination data, then optimization design is improved, but investigation time and initial costs increase
Solution Approach 1:
The patent conducts density-increased supplementary investigation and field tests during the design phase to obtain detailed contamination distribution data and determine key parameters such as diffusion radii and injectability. This preliminary detailed characterization enables precise optimization of dosing ratios and injection parameters, preventing costly remediation adjustments during implementation.
Solution Approach 2:
The patent replaces conservative uniform dosing assumptions with data-driven optimized dosing designs based on field test results and detailed investigation data. This substitution of empirical optimization for theoretical uniformity reduces overall agent consumption and improves remediation precision, offsetting the initial investigation costs through significant remediation efficiency gains.
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 improves the injectability and distribution of remediation agents, reducing the comprehensive agent dosing ratio and costs while ensuring effective remediation, particularly in complex contamination scenarios, by optimizing agent distribution and concentration based on detailed site-specific data.
Implementation Method 1
In-Situ Chemical Oxidation (ISCO) technology adds chemical oxidants to soil and groundwater to oxidize contaminants in groundwater to relatively less toxic products (such as carbon dioxide, water, or chloride ions)
Implementation Method 2
In-situ chemical oxidation high pressure injection optimization remediation method
Data Source
AI summary
An in-situ chemical oxidation high pressure injection optimization remediation method for soil and groundwater. A field test determines the diffusion radius of the injection agent in a typical formation, the maximum single-hole grouting amount per linear meter and the injectability parameter. Density-increased supplementary investigation, soil and groundwater data analysis, is divided by spatial distribution into four concentration main partitions, eight concentration sub-partitions. By optimizing the single-hole grouting amount per linear meter, the preparation concentration of the oxidant, and the parameters of the formulation of each partition, the optimization of the dosing ratio of remediation agent of each partition is achieved. The specific construction performance is to adjust the lifting speed of the high pressure injection drill pipe during the injection process for finally achieve the purpose of reducing the dosing ratio parameters of the agent in the remediation plot.