Hi everybody As you know  ...

Hi everybody

As you know  organic loading rate (OLR) is  defined  multiplying hydraulic flow   rate(HFR) with  BOD or COD  so when  olr is high its means  HFR or BOD goes up. When HFR goes up it's means HRT goes down and when BOD goes up it's means  F/M  goes up at higher allowance prescribed.  In both sides of these conditions  the performance  and quality of treated wastewater  decreases. On the other hand  when  OLR  goes up  your system  shifts from  extended aeration or conventional  system to high rate system . In this condition  your aeration  capacity and HRT and also  goes down comparing to extended aeration system and  my you see sludge  bulking and   turbidity  of  effluent