A plastic media bio tower has vertical flow packing with n = 0.5 and k20 of 0.045 min–1. The tower is cylindrical with a diameter of 10 m. Depth of packing medium is 6 m. The primary effluent flow rate is 2500 m3/d with a soluble BOD5 of 250 mg/L. The average wastewater temperature is 16°C. Direct recirculation is practiced at a 1:1 ratio. Calculate the following: 

a. Organic loading rate of the biotower 

b. Hydraulic loading rate of the biotower 

c. Recirculation ratio 

d. Effluent soluble BOD5 concentration

Answer rating: 100% (QA)

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