Soil Remediation via Turbulent Thermal Layer
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Solution Overview
Problem
Existing methods for remediating soil contaminated with halogenated hydrocarbons like PCBs, PCDDs, and PCDFs are costly, energy-intensive, and require soil transportation to treatment facilities, making them impractical for in situ treatment.
Innovation Solution
A method involving the removal and sieving of soil, adjustment of moisture content, and thermal treatment in a turbo-heater with a heated wall at 250°C, where the soil flows in a thin, turbulent layer, generating steam that carries out the contaminants, followed by separation and scrubbing to achieve low-energy, in situ remediation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional remediation methods are used, then soil contamination is removed, but high energy consumption and costs are required
Solution Approach 1:
The patent changes the temperature parameter to a moderate range (250-450°C) rather than using extreme high temperatures, achieving effective remediation with lower energy consumption. The thermal treatment parameters are optimized to balance remediation effectiveness with energy efficiency
Solution Approach 2:
The patent extracts and removes the contaminated soil layer containing polyhalogenated hydrocarbons and replaces it with clean soil, achieving remediation without requiring high energy input for complete degradation of all contaminants
2Reliability
If conventional remediation methods are used, then soil contamination is removed, but soil transportation to treatment facilities is required
Solution Approach 1:
The patent enables the treatment system to be transported to the contaminated site and perform remediation in situ, making the treatment location mobile rather than requiring soil transport. The system serves itself by bringing the treatment capability to where it is needed
Solution Approach 2:
Instead of transporting soil to a fixed treatment facility, the patent inverts the approach by bringing the treatment facility to the soil location, reversing the traditional remediation logistics
3Reliability
If high temperature treatment is used, then remediation effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent optimizes the temperature parameter to a moderate range (250-450°C) that is sufficient for effective remediation of polyhalogenated hydrocarbons without requiring extreme high temperatures, thus reducing energy consumption while maintaining reliability
Solution Approach 2:
The patent applies thermal treatment at moderate temperatures that are partially sufficient for complete contaminant degradation, achieving acceptable remediation effectiveness with reduced energy input rather than using excessive high temperatures
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 reduces halogenated hydrocarbon content in soil to safe levels, achieving low energy consumption and reducing costs associated with soil transportation, with the apparatus being easily installable for in situ treatment.
Implementation Method 1
subjecting such soil to thermal treatment while it flows in the form of a thin, turbulent and dynamic layer in contact with a wall heated to at least 250° C.; separating the thermally treated soil from the steam generated following such treatment, said soil being substantially free of the aforementioned polyhalogenated hydrocarbons, which have been removed together with the steam
Implementation Method 2
a cylindrical tubular body (1), provided with a heating jacket (24)
Data Source
AI summary
Method of remediating a soil contaminated by polyhalogenated hydrocarbons, in particular PCBs, PCDDs and PCDFs, comprising the steps of removing and sieving the soil to free it of stones and gravel; possibly regulating the moisture content of the sieved soil to a value of 10-30%; subjecting the sieved soil to thermal treatment while it flows in the form of a thin, turbulent, dynamic layer in contact with a wall heated to at least 250° C.; separating the thermally treated soil from the steam generated following such treatment, the soil being substantially free of the aforementioned polyhalogenated hydrocarbons.