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Source: R.E. Treybal, 1980, Mass transfer operations, 3d ed., New York: McGraw-Hill.

Source: R.E. Treybal, 1980, Mass transfer operations, 3d ed., New York: McGraw-Hill.

tom of the tower. In some configurations (e.g., induced draft systems), the air is drawn through the tower by the blower instead of being forced. The water supply pumps usually control the blowers to coordinate the air and water flows. The offgas from an air stripper may need to be treated, depending on air emission requirements, with the use of granular activated carbon, catalytic oxidation, or incineration (U.S. EPA 1985a). The liquid effluent from the air stripper may contain trace amounts of contaminants which can be treated by GAC.

Maintenance of air stripping systems is minimal and usually involves the blower. However, periodic inspection of the packing is required if the water contains high levels of iron, suspended solids, or microbial population.

During the aeration process, dissolved iron and manganese can be oxidized and deposited on the packing material. This deposit can build up and clog the packed bed and, therefore, reduce system efficiency. Pretreating the influent can control iron deposition. A high microbial population can lead to a biological build up within the packed bed and reduce system performance. This problem can also be prevented through pretreatment of the influent.

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