Variable-Flow Soil Vapor Extraction System for Contaminant Plume Remediation
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Solution Overview
Problem
Existing soil vapor extraction systems face challenges in achieving a balance between formation permeability and extraction rate, leading to difficulties in effectively removing contaminants like hydrocarbons from soil.
Innovation Solution
A controllable contaminant-extraction system with a control assembly that randomly changes the flow rate of extractable contaminants through an extraction conduit, allowing for variable operation modes and using a windmill for power, to optimize contaminant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant extraction rate is maintained, then the extraction system operates predictably, but the balance between formation permeability and extraction rate becomes difficult to achieve
Solution Approach 1:
The system transitions from constant-speed pump operation to variable-speed operation controlled by a programmable logic controller (PLC). The PLC randomly varies the pump speed between minimum and maximum limits, allowing the extraction rate to dynamically adapt to formation permeability conditions while maintaining predictable operational bounds.
Solution Approach 2:
The invention changes the operational parameter of pump speed from a fixed constant to a variable parameter with random fluctuations within defined limits. This parameter change enables the system to optimize contaminant removal efficiency by adapting to varying formation conditions while maintaining reliable operation through programmed constraints.
2Productivity
If the extraction rate is increased to improve contaminant removal, then productivity increases, but the balance with formation permeability becomes更难 to maintain
Solution Approach 1:
The system uses dynamic speed variation instead of static high-rate operation. The PLC-controlled variable speed pump adjusts extraction rates in real-time, allowing high productivity during favorable conditions while automatically reducing rates when formation permeability limits are approached, thus maintaining balance stability.
Solution Approach 2:
The system implements feedback control through the PLC monitoring and adjusting pump speed based on operational conditions. Although not explicitly stated as closed-loop feedback, the random variation within programmed limits creates a self-regulating mechanism that responds to formation conditions, maintaining the balance between extraction rate and permeability.
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 approach enhances the efficiency of contaminant extraction by cyclically varying the flow rate, reducing contaminant concentration in the soil plume, and potentially extending the remediation process duration.
Implementation Method 1
using a windmill for power
Implementation Method 2
SVE is based on the mass transfer of contaminant from the solid and/or liquid (aqueous or non-aqueous) phases into the gas phase
Data Source
AI summary
An apparatus includes a controllable contaminant-extraction system configured to, at least in part, extract an extractable contaminant from a contaminant plume positioned in the soil via an extraction conduit extending in the contaminant plume. A control assembly is configured to control operation of the controllable contaminant-extraction system in such a way that the controllable contaminant-extraction system extracts the extractable contaminant via the extraction conduit by randomly changing, at least in part, a flow rate of the extractable contaminant that is extracted from the contaminant plume.