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By Gaetano Joseph Celenza

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Generally, vendors quote maximum 5 m (15 ft) depth limits for units greater than 11 kW (15 hp), with recommended depths decreasing for smaller units. " The spacing depends on the unit's radius of mixing, which increases with increased horsepower. The minimum and maximum radius of influence defines the limits of the unit. Units spaced too closely result in interfering unit patterns, whereas those spaced too far apart result in areas of low or no mixing. These units are highly efficient and when operated at design conditions usually require the least total installed horsepower.

The required or actual oxygen rate (AOR) and the standardized oxygen transfer rate (SOTR) must be equated to a common basis for design purposes. 17 mg/L; and T is wastewater temperature, °C. Process calculations presented in design texts are sometimes confusing because of the method chosen to apply the Page 3 correction. 6), and actual oxygen rate and standard oxygen rate (SOR) used to define capacities. where Fc is a product of the individual correction factors. , The number of required devices can be calculated by (2) The correction factor can be applied to the SOTR rating of the device, corrected to the actual conditions (OTR), as follows: The number of required devices calculated by, Application of these concepts are further explained in the Process Engineering Section and illustrated in Case Study 9.

The top turbine acts as a surface aerator. 1 [8,9]. Forced air draft turbine aerators employ an external source to deliver air to a sparger ring located below a mixing turbine beneath the liquid surface, usually near the bottom. The large bubbles formed are disintegrated into finer bubbles, which are injected into the aeration volume influenced by the turbine. A second turbine, located above the air injection area, adds additional mixing energy to the active region. 1 [8]. Horizontal Axis Aerators Horizontal axis aerators are available for specially designed aeration basins, commonly long, narrow, and shallow.

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