time during aeration. This bypass stream is equipped with a manual
valve. In order to better distribution of air, installation of cap would
be able to increase dissolved oxygen in the aeration Tank. Use of a Bar
Screen in the inlet stream of the aeration Tank is suggested to
separate big suspended particles. Injection of anti-foam to bypass
streamcan help to control foam. Also, injection of hydrogen peroxide
to neutralize the toxic effects of detergents is recommended. Injection
should be done in situations while the use of detergents is high.
In addition, installation of a Comminutor at the inlet streamof Sump
and calibration of Level Transmitter would be useful (modifications
have been shown with red color (in the web version) in the Fig. 13).