Subsurface Remediation via Surfactant Mapping and Vacuum Extraction
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Solution Overview
Problem
Current methods for remediation of contaminated soil and groundwater are ineffective in identifying contamination patterns and efficiently extracting contaminants, particularly in complex subsurface environments with varying geologic and hydrologic conditions.
Innovation Solution
A method involving the injection of an infiltration test surfactant to determine the radius of influence, followed by the injection of a remediation surfactant and subsequent dual-phase high vacuum extraction using a well-head cap seal and vacuum extraction system to mobilize and remove contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional remediation methods are used, then treatment can be applied broadly, but effectiveness in identifying contamination patterns and extracting contaminants is poor
Solution Approach 1:
The method performs preliminary actions by injecting a test surfactant before the main remediation surfactant to map contamination patterns and determine the radius of influence. This preliminary mapping step enables targeted placement of extraction wells and optimization of remediation parameters, directly resolving the contradiction by improving both identification precision and extraction effectiveness.
Solution Approach 2:
The system implements feedback by analyzing soil samples for surfactant presence to determine contamination patterns and radius of influence, then using this information to optimize the main remediation surfactant injection and extraction well placement. This feedback loop ensures both precise contamination identification and effective contaminant extraction.
2Productivity
If surfactant is injected to reduce surface tension and increase hydrocarbon mobility, then contaminant extraction efficiency improves, but the complexity of determining optimal injection parameters increases
Solution Approach 1:
The test surfactant injection serves as a preliminary action that simplifies parameter determination by providing empirical data on radius of influence and contamination patterns. This preliminary test eliminates the need for complex theoretical calculations and enables straightforward optimization of main surfactant injection parameters, resolving the contradiction between extraction efficiency and parameter determination complexity.
Solution Approach 2:
The system uses self-service by allowing the test surfactant to naturally migrate through the subsurface and be detected in soil samples, automatically providing information about contamination patterns and radius of influence without requiring complex external measurement systems. This self-service approach simplifies parameter determination while maintaining high extraction efficiency.
3Measurement precision
If multiple soil samples are collected and analyzed to determine radius of influence, then surfactant injection accuracy improves, but time and resource consumption increases
Solution Approach 1:
The method uses partial action by collecting soil samples at strategically selected locations rather than comprehensive sampling of the entire contaminated area. This selective sampling approach maintains sufficient precision for determining radius of influence while significantly reducing time and resource consumption compared to exhaustive sampling methods.
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 allows for precise identification of contamination patterns and effective extraction of contaminants by reducing surface tension and increasing mobility of hydrocarbons, enabling targeted remediation and efficient removal from the subsurface.
Implementation Method 1
reducing surface tension and increasing mobility of hydrocarbons
Implementation Method 2
mobile dual-phase high vacuum extraction of soil and groundwater
Implementation Method 3
maintain a vacuum pressure within a predetermined range
Data Source
AI summary
A method and system for remediation of a contaminated subsurface area. The method comprises an infiltration operation in which a surfactant containing a fluorescent dye is injected to various depths in the contaminated area. The surfactant dye may be injected using a gravity feed process or pressure injection. Soil samples are taken at various distances from the injection point. The soil samples are analyzed to determine the radius of influence of the surfactant. Flow rates, flow volumes, and flow paths of the surfactant are determined from the soil samples. A remediation surfactant is injected to encapsulate liquid hydrocarbons in the contaminated area. The contaminant is then extracted from the area using a vacuum extraction system. The extraction system comprises flexible tubing inserted through a port in a well-head cap. The tubing is inserted to an appropriate depth to maintain a predetermined vacuum pressure.