Answer Happy

SUBJECT : WASTE WATER ENGINEERING
39. An aerated lagoon is designed to treat domestic wastewater from 40,000 PE. It comprised of an aerated lagoon followed by a maturation pond. Two systems are to be installed in parallel. The followings design consideration will be used: OFaculty of Civil Engineering SKAB 2922-Wastewater Engineering BOD influent=250 mg/L Dissolved BOD effluent from aerated lagoon = 20 mg/L Minimum operating temperature -20°C Maximum operating temperature - 35°C Y = 0.65 b=0.07 d'1; K=5d¹; K₁=0.3 (All values at 20°C) Assume pond depth of 2.5 m Answer the followings: (i) (ii) (iii) (iv) HRT and oxygen requirement of each aerated lagoon Area required for each aerated lagoon Total BOD effluent of each lagoon Effluent from maturation pond assuming 75% solid removal in the pond