Dear Ahmad, If we use: ...

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Dear Ahmad,

If we use:


Qavg= 5000 m3/day (to calculate the aeration tank volume)

Qmax= 14400 m3/day

F/M=0.3 1/day

MLSS=3000 ppm

BODin=240 BODout=20 ppm

Calculate SRT ​using Y=0.4 and ​kd=0.04 1/day

The minimum calculated volume must be near to 1184 m3 as Rafael Gay suggest (1300 m3). This value will give you a minimum SRT near to 6,1 d and HRT near to 0,24 ​days.

On the other hand if you want use a factor due to the Qmax (in a day or in a spacial season) without the use of a equalization tank, you must use the right flow pattern and calculations to obtain a bigger volume.

 

Regards,

 

Orlando D. Gutiérrez Coronado