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Table 5

Relative number of agitators with different td (24 h, 14–22 h, 2–12 h) depending on aeration type (pressure aeration, unaerated tanks) and tank type (oxidation ditch, circular tanks, rectangular tanks)

Daily operating time tdOxidation ditchCircular tanksRectangular tanks
(h d−1)(%)(%)(%)
Pressure aeration 
 24 74 63 33 
 14–22 14 17 34 
 2–12 12 20 33 
Unaerated tanks 
 24 86 86 82 
 <24 14 14 18 
Daily operating time tdOxidation ditchCircular tanksRectangular tanks
(h d−1)(%)(%)(%)
Pressure aeration 
 24 74 63 33 
 14–22 14 17 34 
 2–12 12 20 33 
Unaerated tanks 
 24 86 86 82 
 <24 14 14 18 
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