In-Situ Soil Remediation via Thermal Conductive Heating and Chemical Oxidation
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Solution Overview
Problem
Current in-situ remediation technologies for organically contaminated soils have a low pollutant removal rate, limiting the effectiveness and sustainability of soil remediation processes.
Innovation Solution
A method combining in-situ thermal conductive heating, multi-phase extraction, and in-situ chemical oxidation using a cycle of hot steam injection and oxidizing agents, specifically hydrogen peroxide and persulfate, to enhance pollutant removal, with multiple rounds of injection and controlled temperature and concentration management to optimize oxidation and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If in-situ remediation technology is used, then investment cost is reduced and secondary contamination is avoided, but pollutant removal rate is low
Solution Approach 1:
The patent combines thermal conductive heating, steam injection, and chemical oxidation into a multi-technology coupling system. The heating component activates the oxidizing agents while steam injection enhances mass transfer, creating a synergistic effect that achieves high pollutant removal rates without ex-situ treatment and secondary contamination.
Solution Approach 2:
The patent utilizes temperature as a key parameter, heating the contaminated soil to activate oxidizing agents and enhance reaction rates. By controlling temperature parameters, the system achieves effective pollutant degradation in-situ while maintaining process efficiency.
2Ease of manufacture
If traditional in-situ remediation is used, then investment is low, but pollutant removal rate is low
Solution Approach 1:
The patent merges multiple remediation technologies (thermal heating, steam injection, chemical oxidation) into an integrated in-situ system. This combination achieves high pollutant removal rates while maintaining the cost advantages of in-situ treatment by avoiding expensive ex-situ remediation infrastructure.
Solution Approach 2:
The patent introduces steam as an intermediary medium that facilitates heat transfer and enhances mass transfer of oxidizing agents into the contaminated soil. This intermediary approach improves pollutant removal efficiency without requiring direct high-cost intervention methods.
3Productivity
If multiple cycles of oxidizing agent injection are performed, then pollutant removal rate increases, but energy consumption and oxidizing agent usage increase
Solution Approach 1:
The patent employs periodic cycles of steam injection followed by oxidizing agent injection. This periodic action allows the system to achieve thorough pollutant removal through multiple treatment cycles while managing energy and chemical usage efficiently by resetting and reactivating the treatment process in controlled intervals.
Solution Approach 2:
The patent utilizes steam phase transitions (liquid to gas and back) as a thermal field to activate oxidizing agents and enhance mass transfer. This phase transition mechanism improves pollutant removal efficiency without requiring proportional increases in energy input, as the latent heat of vaporization provides intensive heating during phase change.
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 significantly increases pollutant removal rates, reduces energy consumption, and minimizes oxidizing agent usage, achieving a 50% cost savings and 1/3 to 1/5 reduction in overall energy consumption compared to traditional methods, while ensuring environmental sustainability and avoiding secondary contamination.
Implementation Method 1
preheating the soil at a contaminated site by using in-situ thermal conductive heating (TCH) technology
Implementation Method 2
performing a cycle of injecting hot steam
Implementation Method 3
injecting hot steam, multi-phase extraction
Implementation Method 4
injecting an oxidizing agent into the soil at the contaminated site... the oxidizing agent includes a hydrogen peroxide solution and persulfate
Data Source
AI summary
The present invention provides a method for in-situ remediation of contaminated soil through multi-technology coupling. The remediation method comprises the following steps: preheating the soil at a contaminated site by using in-situ thermal conductive heating (TCH) technology, and then performing multi-phase extraction; and performing a cycle of injecting hot steam, multi-phase extraction, and injecting an oxidizing agent into the soil at the contaminated site. A system for in-situ remediation of an organically contaminated soil based on the aforementioned method for in-situ remediation of the organically contaminated soil includes a heating well, an injection well, and an extraction well. The heating well is connected to an in-situ thermal conductive heating system, and used for preheating of the soil at the contaminated site. The injection well is connected to an in-situ injection system, and used for injecting the hot steam and the oxidizing agent. The extraction well is connected to a vacuum extraction system, and used for the multi-phase extraction of the contaminated site. In the present disclosure, a pollutant removal rate of the organically contaminated soil is greatly increased by means of a combination of multiple technologies coupled together.