How You Can Use Air Strippers to Clean Water
In any industrial setup where there is a significant amount of wastewater produced, there is a necessity to ensure proper cleanup and disposal is performed. This is vital to environmental compliance and to ensure that the area is deemed safe for future use. Air stripping is one technology used to cleanup petroleum spillage, groundwater contamination for the purpose of removing these contaminants from the environment.
What Exactly is Removed in the Air Stripping Process?
The process of air stripping calls for the removal of chemicals namely VOCs or volatile organic compounds. These are dangerous chemicals that quickly evaporate by shifting from a liquid to a gaseous state. Once air and chemical vapors blend with one another, the vapors are expelled.
Air stripping removes a number of different contaminants that are very harmful to humans and the environment. Here are some of them:
- Trichloroethylene (TCE)
- Perchloroethylene (PCE)
- 1,1-Dichloroethane (1,1-DCA)
- Vinyl Chloride
- Carbon Tetrachloride
- Dissolved Gases
- Hydrogen Sulfide (H2S)
- Carbon Dioxide (CO2)
Why Air Stripping?
Air stripping technology comes in a variety of sizes. This means an air stripping machine is used with a size and specification pertinent to the area required for decontamination. They are modularly shaped, lightweight and easy to install. With air stripping you are essentially eliminating the need for transporting contaminated water for decontamination as the procedure can be done onsite. Almost all pollutants around 99% are removed via the process.
Packed Air Strippers
Using packed air strippers are more practical and cost effective for larger flows and when large fractional removals are needed like in wastewater with a highly contaminated source. They work or operate at a fraction of the pressure drop. This means there is a reduction in horsepower requirements for air movement. Conventional air strippers work by introducing contaminated water at the top of a packed bed. A type of plastic media is normally used to offer a large surface area per unit volume for mass transfer. Water is then introduced down the packed bed in the opposing direction while ascending air gets rid of the VOC and exits at the top of the stripper. This results in clean water, which is carefully distributed at the top of the tower by using a special type of liquid distribution system. There is a support plate at the bottom that is designed to prevent any gas flow constraints. In setups where the depth is more than 25 feet, separately supported beds are used and integrated with a collection-distribution stage in between.