Adjustable Depth Air Sparging System for Groundwater Remediation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for remediation of chlorinated solvents in groundwater, such as In-situ Chemical Oxidation, face challenges in delivering chemical oxidants or nutrients to low permeability matrices within the soil's subsurface, leading to inefficient contaminant destruction due to diffusion and mass transfer limitations.
Innovation Solution
An adjustable depth air sparging system that injects pressurized air mixed with chemical oxidizers or nutrients through a flow-through packer and well screen, creating a chemical oxidizer plume and air channel matrix to enhance contaminant destruction in the soil's saturated zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical oxidants are introduced into the soil's subsurface to destroy organic contaminants, then contaminant destruction is promoted, but adequate distribution of oxidants within the subsurface is difficult to achieve
Solution Approach 1:
The system uses pressurized gas (air or nitrogen) to deliver chemical oxidants through injection ports into the subsurface. The gas pressure forces the oxidant solution through the soil matrix, achieving distribution in low permeability zones where diffusion alone would be insufficient. This pneumatic delivery mechanism resolves the contradiction by providing both contaminant destruction (through oxidant delivery) and adequate distribution (through pressurized flow).
Solution Approach 2:
The system utilizes the porous structure of soil and incorporates porous distribution elements (such as perforated pipes or injectors) to disperse chemical oxidants throughout the subsurface. The porous materials allow the oxidant solution to distribute through capillary action and pressure gradients, achieving widespread contamination treatment while maintaining effective oxidant delivery to target zones.
2Reliability
If pump-and-treat technologies are used for hydraulic containment, then groundwater contamination is addressed, but life-cycle costs exceed $2 billion
Solution Approach 1:
The system replaces the mechanical pump-and-treat approach with an in-situ chemical oxidation method. Instead of mechanically pumping groundwater to the surface for treatment and reinjection, the system directly introduces chemical oxidants into the contaminated zone where they destroy contaminants in place. This substitution eliminates the energy-intensive pumping, storage, and reinjection infrastructure, dramatically reducing life-cycle costs while maintaining reliable remediation.
Solution Approach 2:
The system extracts the core remediation function (contaminant destruction) from the expensive pump-and-treat process. By taking out only the essential contaminant destruction capability and implementing it through direct in-situ chemical oxidation, the system eliminates unnecessary mechanical components and operational costs associated with hydraulic containment and repeated pumping cycles.
3Productivity
If chemical oxidizers are injected into low permeability matrices, then contaminant contact is improved, but diffusion and mass transfer are minimal
Solution Approach 1:
The system uses pressurized gas to force chemical oxidants through low permeability soil matrices at velocities that overcome diffusion limitations. The high-velocity gas-driven flow creates pressure gradients that push oxidants through tight pore spaces, ensuring adequate reactant-contaminant contact without relying on slow molecular diffusion. This resolves the contradiction by maintaining high productivity through forced convection while compensating for minimal natural mass transfer in low permeability materials.
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 system effectively delivers chemical oxidizers or nutrients to the subsurface, promoting the destruction of chlorinated aliphatic hydrocarbons, thereby improving the efficiency and cost-effectiveness of groundwater remediation.
Implementation Method 1
The pressurized air traveling through the flow-through packer inflates the packer, sealing the flow-through packer against the interior wall of a well casing and preventing injected air, chemical oxidizer or a nutrient from flowing back up the well casing.
Implementation Method 2
The well head manifold is pneumatically sealed using a compression fitting containing a rubber o-ring. The compression fitting prevents the source of air from escaping into the atmosphere through the well head.
Implementation Method 3
The air stream chemical oxidizer mixture or air stream nutrient mixture under pressure is then driven into the soil forming a chemical oxidizer plum and air channel matrix within the soil.
Implementation Method 4
The added chemical oxidizer or nutrient promotes the destruction of chlorinated aliphatic hydrocarbons in groundwater.
Data Source
AI summary
A supplemental fluid adjustable depth air sparging system which is used to remediate contaminants from groundwater within the soil. An adjustable depth air injection point injects compressed air mixed with a chemical oxidizer or nutrient into saturated or groundwater regions of the soil's subsurface to remove contaminants including chlorinated solvents from the soil's subsurface.