Groundwater Remediation via Surface Pond Adsorption
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Solution Overview
Problem
Conventional methods for removing contaminants like PFAS, methane, and hydrogen sulfide from groundwater are ineffective due to high concentrations of interfering constituents, high costs, and reduced efficacy, making ex-situ treatment economically impractical and difficult to maintain.
Innovation Solution
A process involving the creation of a surface-water feature where adsorbent materials like REMBIND, powdered activated carbon, clay, or metal oxides are used to isolate and reduce contaminant concentrations by increasing oxygen levels and allowing diffusion of gases, facilitating the natural flow of treated water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional treatment methods (liquid-phase GAC) are used to remove PFAS from groundwater, then contaminant removal is attempted, but the system becomes ineffective due to interfering constituents, high costs, and maintenance issues
Solution Approach 1:
The patent extracts the contaminated groundwater from the subsurface environment and concentrates it in a aboveground treatment pond. This allows the application of adsorbent materials directly to the concentrated contaminant source, removing the need for complex pump-and-treat systems and enabling more effective treatment through direct contact between adsorbents and contaminants.
Solution Approach 2:
The patent changes the physical state and concentration parameters of the contaminated water by allowing it to pool in an aboveground pond. This concentration effect increases the efficiency of adsorbent materials and allows for simpler treatment mechanisms compared to diluted groundwater systems.
2Reliability
If adsorptive filtering techniques are used to reduce contaminant levels, then PFAS compounds can be captured, but filters become plugged and adsorptive materials lose effectiveness, requiring frequent maintenance
Solution Approach 1:
Instead of forcing groundwater through filters that become clogged, the patent inverts the approach by allowing adsorbent materials to be applied directly to pooled contaminated water in a pond. This reverses the flow direction and contact method, preventing filter plugging while maintaining effective contaminant capture through direct adsorption.
3Reliability
If ex-situ treatment methods are applied to groundwater contamination, then treatment can be performed outside the ground, but the costs related to system operation and waste disposal become prohibitively high
Solution Approach 1:
The patent employs passive treatment mechanisms where adsorbent materials are applied to pooled contaminated water and naturally bind to contaminants without requiring continuous energy input. The system uses natural processes rather than energy-intensive pump-and-treat operations, significantly reducing operational costs while maintaining remediation effectiveness.
4Reliability
If the concentration of dissolved oxygen is increased to reduce hydrogen sulfide and methane production, then biological contamination is reduced, but the complexity and cost of pre-treatment chemistry increases
Solution Approach 1:
The patent applies adsorbent materials periodically to the pooled contaminated water rather than requiring continuous complex chemical pre-treatment. This periodic application of simple adsorbents achieves contaminant removal without the ongoing complexity of managing dissolved oxygen levels and interfering chemistry.
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 accelerates the remediation of contaminated groundwater by reducing PFAS concentrations, preventing migration, and minimizing human and environmental exposure, while reducing maintenance costs and improving water quality.
Implementation Method 1
adding an adsorbent chemical to the treatment lake to isolate contamination
Implementation Method 2
an air-water interface is created to allow the direct diffusion of dissolved gasses between the water and atmosphere
Implementation Method 3
The concentration of dissolved oxygen in the surface-water feature may be increased through active or passive methods for reducing hydrogen sulfide and methane
Implementation Method 4
the adsorbent material settles to the bottom of the treatment lake
Data Source
AI summary
A ground water contamination remediation process includes the steps of identifying a source and location of land-based ground water contamination and excavating the soil above and within the location of the contamination to create a void. The width and depth of the void is increased to a predetermined size until the contaminated ground water is exposed creating a man-made treatment lake by allowing the contaminated ground water to partially fill the void. In one embodiment, the water in the treatment lake is aerated to reduce the amounts of hydrogen sulfide, methane, and biodegradable compounds in the contaminated water. In another embodiment, an adsorbent material is added to the treatment lake so to isolate per- and poly-fluoroalkyl substances (PFAS). The adsorbent material is applied to or mixed into PFAS contaminated water, PFAS is adsorbed, and the solid adsorbent materials settle to the bottom of the lake for subsequent management or removal.