4.2.AWWTP is to treat 5 MGD of wastewater using activated sludge. Five sets of aeration tank followed b) 76 Ib/d.ft² c) 51 Ib/d.ft² d) 631b/d.ft² by five secondary clarifiers to be used of which four of them to be working at any time. The MLSS is 1400 mg/L. What is the solids loading rate if the cross section area is 300 ft² and the flow rate of activated sludge need to be returned from the recycling line is 30%? a) 46 Ib/d.ft² 4.3.Two machines working in a room measures (40 m x 10 mx 5 m). Every machine emits an air pollutant (MW=106 g/mole) at a rate of 230 mg/hr. Assume the air pollutant is conservative. How many air changes per hour are needed to maintain a concentration of 0.1 ppm in a STP of 1 atm. and d) 1.25 change/hr c) 0.76 change/hr 25°C? b) 0.53 change/hr tnining_tr mete a) 0.25 change/hr
4.2.AWWTP is to treat 5 MGD of wastewater using activated sludge. Five sets of aeration tank followed b) 76 Ib/d.ft² c) 51 Ib/d.ft² d) 631b/d.ft² by five secondary clarifiers to be used of which four of them to be working at any time. The MLSS is 1400 mg/L. What is the solids loading rate if the cross section area is 300 ft² and the flow rate of activated sludge need to be returned from the recycling line is 30%? a) 46 Ib/d.ft² 4.3.Two machines working in a room measures (40 m x 10 mx 5 m). Every machine emits an air pollutant (MW=106 g/mole) at a rate of 230 mg/hr. Assume the air pollutant is conservative. How many air changes per hour are needed to maintain a concentration of 0.1 ppm in a STP of 1 atm. and d) 1.25 change/hr c) 0.76 change/hr 25°C? b) 0.53 change/hr tnining_tr mete a) 0.25 change/hr
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:4.2.AWWTP is to treat 5 MGD of wastewater using activated sludge. Five sets of aeration tank followed
b) 76 Ib/d.ft²
c) 51 Ib/d.ft²
d) 631b/d.ft²
by five secondary clarifiers to be used of which four of them to be working at any time. The MLSS is
1400 mg/L. What is the solids loading rate if the cross section area is 300 ft² and the flow rate of
activated sludge need to be returned from the recycling line is 30%?
a) 46 Ib/d.ft²
4.3.Two machines working in a room measures (40 m x 10 mx 5 m). Every machine emits an air
pollutant (MW=106 g/mole) at a rate of 230 mg/hr. Assume the air pollutant is conservative. How
many air changes per hour are needed to maintain a concentration of 0.1 ppm in a STP of 1 atm. and
d) 1.25 change/hr
c) 0.76 change/hr
25°C?
b) 0.53 change/hr
tnining_tr mete
a) 0.25 change/hr
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