When we talk about air stripping, we are referring to the process of removing VOCS or volatile organic chemicals from wastewater using a form of aeration treatment. Volatile organic chemicals are dangerous manmade chemicals that are released from solids and liquids in the form of a gas.
They include chlorinated solvents and chemicals normally found in fuel and other petroleum products. They are also seen in paint thinners, hydraulic fluids and dry-cleaning agents. Contamination of drinking water with volatile organic chemicals is a cause of major concern due to the presence of many carcinogens found in them.
A lot of volatile organic chemicals can be found in industrial wastewater and groundwater supplies and to some extent even surface water. Contact with any of these chemicals result in CNS, skin, liver and kidney problems.
Using an air stripper, these volatile organic compounds are effectively removed from both waste and groundwater sources. Here is how it works, liquids usually wastewater is brought into contact with a gas, in this case air for the purpose of removing the undesirable agent present in the liquid phase so that it can be safely disposed of.
How effective is Air Stripping?
This is determined by the air-to-water ratio. In this case, the treatment effectiveness is increased as the air-to-water ratio increases. Stripping towers are designed to have large air capacity for better treatment results. Also, the kind of contaminant that requires removal and it concentration in the wastewater also has a major factor in terms of effectiveness. Other factors like, water temperature and the presence of other contaminants such as dissolved solids also play an important role. Once all of the chemicals have evaporated they are then removed safely. Some of the chemicals simply dissipate when exposed to sunlight while other gases may require further treatment in order to get rid of safely.