If you work in an industry that uses petroleum products, cleaning solvents, process wastewater, groundwater, or other harmful contaminants, chances are you have seen an air stripping tower. This type of equipment, which is made by air stripping tower manufacturers, is used to clean water in factories, drinking water facilities, waste cleanup sites, and anywhere that contaminated water is found. Air stripping technology removes chemicals called volatile organic compounds (VOCs), that are easily evaporated from liquid solution into the gas phase. Once the VOC is captured in the air, the very low concentration air mixture is typically released to atmosphere. Vapor phase air treatment is also an option for higher concentrations.
Packed column air strippers are the most common type of air strippers. Packed column air strippers are also the most economical and effective treatment option for large flows of waste water and highly contaminated source water. They operate at a fraction of the pressure drop of low profile or bubbling air strippers, which results in a large reduction in the horsepower requirement for air movement in the stripper.
Here is how they work: Water is pumped from the source up to the top of the tower. The liquid is carefully distributed at the top of the tower by way of a specially designed liquid distributor and flows down by gravity through the packed bed in the opposite direction of ascending air being blown upwards by a mechanical blower. The VOCs are transferred from the contaminated water stream to the air stream and then exit through the top of the stripper. Treated water is collected at the bottom of the tower in the sump. The packing is supported at the bottom of the bed by a support plate that is carefully designed not to restrain the gas flow.
Since the principles of aeration and mass transfer don’t change depending on the water source, air strippers can be used to clean contaminated groundwater and industrial process water. This process is typically referred to as a pump-and-treat remediation system when used with groundwater.
Air stripping tower manufacturers are not all created equal. Delta Cooling Towers Inc. offers a patented system of Vanguard® Air Strippers and Degassifiers. With available sizes up to 15-foot diameter and capacities of up to 4000 GPM per column, these units are some of the most innovative and efficient on the market. With more than 600 installations worldwide, the proof is in our successful track record.
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