A flocculation basin equipped with revolving paddles is 60 ft long (the direction of flow). 45 ft wide, and 14 ft deep and treat
1 answer:
Answer:
detention time = 40.72 minutes
horizontal velocity v = 0.295 inch/s
mean velocity gradient, G = 54.38
Explanation:
given data
long = 60 ft
wide = 45 ft
deep = 14 ft
flow of water to treat = 10 mgd = 15.472 ft³/s [1 MGD = 1.5472 ft³/s ]
inner velocities = 1.0 fps
outer velocities = 1.4 fps
power required to rotates the paddles = 930 ft-lb/s
solution
we find detention time that is
time =
here Q = flow of water and V is volume of water
so
volume of flocculation basin is = 60 × 45 × 14 = 37800 ft³
so
detention time =
detention time = 40.72 minutes
and
horizontal flow through velocity is
cross-section area of tank = 45 × 14 = 630 ft²
and we know that Av = Q
so horizontal velocity v =
horizontal velocity v =
horizontal velocity v = 0.02456 ft/s
horizontal velocity v = 0.295 inch/s
and
now we find mean velocity gradient G at temperature of 50'F
so formula is G =
here P is power input and μ is viscosity and V is volume of flocculation basin
so Volume of flocculation basin is 37800 ft³
and μ for 500F = 8.3197 × lb-s/ft²
we take from table
so we get
G =
mean velocity gradient, G = 54.38
You might be interested in
Solution :
Methods for selling pressure of a distillation column :
a). Set, the overhead stream using cooling water.
(minimum of approximate 45°C condenser temperature)
b). Set, of bottom product that avoids decomposition or reaction.
c). Set, not utility for reboiler.
Running the distillation column above the ambient pressure because :
The components to be distilled have very high vapor pressures and the temperature at which they can be condensed at or below the ambient pressure.
Run the reactor at an evaluated temperature because :
a). The rate of reaction is taster. This results in a small reactor or high phase conversion.
b). The reaction is endothermic and equilibrium limited increasing the temperature shifts the equilibrium to the right.
Run the reaction at an evaluated pressure because :
The reaction is gas phase and the concentration and hence the rate is increased as the pressure is increased. This results in a smaller reactor and /or higher reactor conversion.
The reaction is equilibrium limited and there are few products moles than react moles. As increase in pressure shifts the equilibrium to the right.
Answer:
The answer is 380.32×10^-6
Refer below for the explanation.
Explanation:
Refer to the picture for brief explanation.
