Applying Henry`s Law to groundwater treatment
Air strippers are very popular equipment for mass transfer where air and water are contacted and the contaminants are transferred from water into the air phase. In a typical air-stripper arrangement, water flows from the top and air is blown from the bottom. The increase in surface area between the air and the water phases increases the removal efficiency. In packed towers, high-surface-area packing materials are used to that end. In a sieve tray tower, water flows across the tray through channels separated by baffles and air flows from the bottom, up through holes in the tray. In diffused aerators, air is introduced through a bubbler or a nozzle into the water stream. All these units are commercially available. Several environmental consulting and remediation engineering firms use Henry`s Law to predict the stripping performance of volatile and semi-volatile contaminants present using the above equipment. Extensive work has been done during the past few decades to determine Henry`s Law constant, H. Different procedures are reported in the literature to determine henry`s Law constant for various chemicals from the experimental data and from empirical correlations. This article discusses the reasons why so much error is observed in reported values of henry`s Law constants in the literature--the effect of various parameters such as temperature, co-solubility, etc., on H value. A modified experimental procedure to measure Henry`s Law constant is presented, then the law is applied in predicting stripping performance of various chemicals.
- OSTI ID:
- 207916
- Journal Information:
- Pollution Engineering, Vol. 28, Issue 3; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cross-flow versus counterflow air-stripping towers
Selection guide for volatilization technologies for water treatment. Final report, February 1984-June 1984