Dear Mr Bahlake, I saw only ...

Dear Mr Bahlake,

I saw only this morning your answer where you clarify that the plant is municipal and the peak flow duration it’s only 2 hours/day.

All municipal wastewater treatment have once or  twice per day peak flow that can reach, in function of the city dimension, up to 3 times the average flow.

F/M is based on kg of BOD/day so the peak must be included in the kg of BOD entering in the biological reactor every day.

Plant section like sedimentation basin must be dimensioned on the basis of m3/h entering in the plant so it’s necessary to use the max hourly inlet flow.