Figure 2 Example Aerated Draft Tube Reactor - U S Environmental 2025

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Cubic feet per second (cfs): One cubic foot per second is equivalent to a stream of water in a ditch 1- foot wide and 1-foot deep flowing at a velocity of 1 foot per second. It is also equal to 450 gallons per minute, or 40 miners-inches.
Solids are maintained in suspension as the mixed liquor circulates around the ditch. If design SRTs are selected for nitrification, a high degree of nitrification will occur. Oxidation ditch effluent is usually settled in a separate secondary clarifier.
The typical design velocity for low flow conditions is 0.3 m/s (1 foot/second). During peak dry weather conditions the sewer lines must attain a velocity greater than 0.6 m/s (2 feet/second) to ensure that the lines will be self- cleaning (i.e., they will be flushed out once or twice a day by a higher velocity).
Oxidation ditches have the advantage of much more efficient sludge removal. But they are costly, not only in monetary terms, but also in terms of pollution to the environment.
The BOD removal efficiency can be up to 97%. The oxidation ditch technology originated in the Netherlands in the 1950s [2]. The first generation of oxidation ditch owned intermittent, aeration, precipitation. The second generation of oxidation ditch had vertical aerator, nitrification and denitrification reaction.
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The flow velocity in the oxidation ditch is maintained in the range of 25-30 cm/s to keep the microorganisms suspended. In general the process consists of anoxic zone followed by aerobic one as illustrated in Figure 3.
In oxidation ditches, horizontal velocity can vary between 0.25 to 0.60 m/s, with typical values between 0.25 to 0.35 m/s [1].

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