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Calculate the number of fine diffusers required for the following data. Flow: 300 m3/h BOD load: 1000 mg/L

Calculate the number of fine diffusers required for the following data. Flow: 300 m3/h BOD load: 1000 mg/L Correct Answer 146

BOD load in Kg/day = Inlet BOD in mg/l x Flow in m3/day /1000 =1000 x 300 / 1000=300 Kg/day. Theoretical oxygen requirement = BOD load x Kg of O2/Kg of BOD= 300 x 1.8 = 540 Kg of O2/day. Standard O2 Requirement = Theoretical O2 requirement/ Alpha x x Theta(Tww-20°C)/ Css= 540/24/ x 1.024(30-20)]/9.86=48 Kg of O2/hr. Air requirement = Actual Oxygen requirement/ (Density of air x % of O2 in air by weight x SOTE%) = 48/( 1.201 x 0.232 x 0.1599)= 875 m3/hr. Factors assumed: SOTE=17.27%; Alpha=0.7; Beta=0.95; Theta=1.024; Surface saturation C=7.97 (Calculated); Site basin saturation Csw=8.64 (Calculated); Standard basin saturation Css=9.86 (Calculated). Number of fine diffusers required = 875/6=146. (flow rate considered for fine diffusers is 6 m3/hr).

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