Steam Stripping for 1,4-Dioxane Removal from Groundwater
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Solution Overview
Problem
Current methods, such as air-to-water stripping, are ineffective for removing 1,4-dioxane from groundwater due to its low Henry's constant and miscibility in water, making it difficult to transfer and remove, with advanced chemical oxidation being the only reliable but expensive option.
Innovation Solution
A stripping process using steam and air as stripping gases to remove 1,4-dioxane from water, involving heating, rapid cooling, and counter-current flow heat exchanger to separate and volatilize the solvent, allowing for further treatment with conventional vapor-phase technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air-to-water stripping is used to remove 1,4-dioxane from groundwater, then the process is simple and low-cost, but the removal efficiency is extremely low due to the low Henry's constant and miscibility of 1,4-dioxane in water
Solution Approach 1:
The invention changes the physical parameters of the stripping gas from ordinary air to steam, fundamentally altering the mass transfer mechanism. By using steam instead of air, the system exploits the high volatility of 1,4-dioxane in the steam phase and the miscibility characteristics, achieving over 90% removal efficiency while maintaining process simplicity
Solution Approach 2:
The invention utilizes phase transition of water from liquid to vapor (steam) to enable effective stripping. The water is heated to generate steam, which then strips 1,4-dioxane from the groundwater. The steam is subsequently condensed back to liquid water, completing a phase transition cycle that achieves efficient solvent removal
2Reliability
If advanced chemical oxidation is used to remove 1,4-dioxane from water, then the removal reliability is high, but the treatment cost is very expensive
Solution Approach 1:
The invention replaces the chemical oxidation mechanism with a physical stripping and phase transition mechanism. Instead of using expensive chemical oxidants, the system uses steam stripping combined with condensation to physically separate and remove 1,4-dioxane, achieving reliable removal at lower cost
Solution Approach 2:
The invention introduces steam as an intermediary substance to facilitate the removal of 1,4-dioxane. The steam acts as a mediator that strips the solvent from water and carries it through the air phase, enabling efficient separation without requiring direct chemical oxidation of the contaminant
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
Achieves over 90% removal of 1,4-dioxane from water, transferring the majority into the air phase for efficient treatment with conventional methods, reducing the need for expensive advanced oxidation processes and minimizing mineral interference.
Implementation Method 1
Water that contains the miscible solvent is heated to its boiling point
Implementation Method 2
the transfer of a dissolved-phase substance in a liquid to a vapor-phase substance in a gas through the interactive contact of the liquid and gas
Implementation Method 3
The mixture of air, steam and the miscible solvent gases is then rapidly cooled to condense the steam into water
Implementation Method 4
The separation may be further enhanced through the use of a counter-current flow heat exchanger
Data Source
AI summary
Water containing one or more solvents miscible in the water is heated to its boiling point. Air is introduced into the vapor mixture of steam and the miscible solvent at an air-to-steam volumetric ratio that is sufficient to get good transfer of the miscible solvent from the steam to air and provides an equilibrium temperature of the steam-air mixture compatible with operations of the heat exchanger. The mixture of gases is then rapidly cooled to condense the steam into water so that a substantial portion of the miscible solvent remains volatilized in the air. The air and condensed steam fractions are separated.