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A water treatment plant has 6 settling tanks that operate in parallel (the flow gets split into six equal flow streams), and each tank has a volume of 600 m3. If the flow to the plant is 10 MGD, what is the retention time in each of the settling tanks? If, instead, the tanks operated in series (the entire flow goes first through one tank, then the second, and so on), what would be the retention time in each tank?
A line of sheet piling is driven 4m into a firm clay and retains, on one side, a 3m depth of fill on top of the clay. Water table level is at the surface of the clay. The unit weight of the fill is 18kN/m3 and the saturated unit weight of the clay is..
A horizontal circular plate weighing 60-lb is suspended from three wires that are attached to a support at D and form 30 degree angles with the vertical. Determine the tension in each wire.
Determine the settlements when a stress of 100 kPa is applied by the building over an area of 10m × 5 m on the soil surface.
At all other times, the wind velocity is zero. Determine for each case the ration of the total energy available from the wind to the total wind energy available at the mean velocity operating continuously
A small town produces 0.15 MGD of wastewater. How many acres in size would an aerated lagoon need to be to treat this wastewater assuming a depth of 8 ft. and a detention time of 6 days
The train is travelling at 0.8 m/s i relative to a man on the side of the tracks. What is the speed of the bug as seen by the man at the side of the tracks? What is the speed of the train relative to (or as seen by) the bug?
What are the different dimensionless groups that describe a golf ball. A golf ball has two velocities, a spin velocity and a forward velocity.
What percentage removal should be expected for each of the following particle settling velocities in an ideal sedimentation tank: 0.1 mm/s, 0.2 mm/s, 1 mm/s.
In determining the difference between points A and B, the inclined distance was measured to be 157.65 ft. The transit was set u on point A. The height of its transverse axis was 5.2 ft about point A.
A cable is made of two strands of different materials, A and B, and cross sections as follows: For material A, K = 60, 000 psi, n = 0.6, Ao = 0.6 in2 For material B, K = 30, 000 psi, n = 0.5, Ao = 0.3 in2
an operator at a wastewater treatment plant decided to increase the SRT from 5 days to 10 days. How will this change affect: a) the oxygen requirement b) MLVSS in the aeration tank.
Why is the torque on A and the torque on AB opposite? Wouldn't they be the same? How do we know which direction the torque is applied at A to begin with? It's not specified.
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