In: Civil Engineering
| 
 Flow rate  | 
 =  | 
 20 000 m3/day  | 
| 
 Minimum temperature of the area  | 
 =  | 
 34◦C  | 
| 
 Medium height  | 
 =  | 
 2 m  | 
| 
 Influent BOD  | 
 =  | 
 300 mg/L  | 
| 
 Effluent BOD  | 
 =  | 
 20 mg/L  | 
| 
 Recirculation flow rate to the tower  | 
 =  | 
 35 000 m3/day  | 
| 
 Wastewater treatability constant  | 
 =  | 
 0.09 min-1 at temperature 20◦C  | 
| 
 Medium coefficient  | 
 =  | 
 0.5  | 
Compute: