The Oxidation Ditch
This is a sometimes used for sewage treatment and is characterised
by a con-structed ellipsoidal ditch, in which the effluent is forced to
circulate around the channel by brush aerators. The ditch itself is trapezoidal
in cross-section to maintain uniform effluent velocity throughout the channel.
Effluent is fed into the system without any prior primary sedimentation and
typically gives rise to only 50% of the surplus sludge produced by a typical
activated sludge process.
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