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1. (Learning objective #12) Penn State uses two 1-stage stone trickling filter for biological treatment of 50% of its wastewater (25% goes to each = 0.5 MGD to each). The BOD entering the plant is 285 pprn. Assume that 35% of the BOD is removed by the primary clarifier.
a. Using a BOD loading requirement of 35 lb/1000 ft'-day and a filter depth of 6ft, determine the diameter of the filter. (68.4')
b. Calculate the hydraulic loading if the recirculation ratio is 1 (0.19 gpm/sf)
c. Calculate the efficiency if the recirculation ratio is 1. (79.5%)
d. Who is the concentration of BOD leaving the trickling filter if the recirculation ratio is 17 (38 PPm)
e. What is the concentration of BOD leaving the trickling filter if the recirculation ratio is 2? (35 PPm)
Two materials A and B are tested and a stress-strain curve is plotted. Material B has a yield stress of 200 MPa and Material A has a Yield stress of 120 MPa. These materials have plastic Deformation occur at the same Yield strain %.
In its natural condition a soil sample has a mass of 2400 g and a volume of 1.15 X 10-3 m3. After being completely dried in an oven the mass of the sample is 2225 g. The value of Gs for the soil is 2.7. Determine the:
A soil sample is prepared in the laboratory by mixing a certain amount of dry soil with 10.5 wt% water. The relative density of the grains of the material is equal to 2.7.
Find the length of the studs in a rake wall with a 5:12 pitch, a half span of 9'4", 16" OC and a base height of 7'3".
If the pulleys are fixed to the shaft, determine the magnitude of the tension T and the x,y,z componenet sof reaction at the smooth thrust bearing A and smooth journal bearing B.
A tied short column of square cross-section is subjected to a factored axial load of 2500 kN and a factored bending moment of 175 kN.m. Use a 40 mm clear cover to the ties and a 20 mm maximum aggregate size.
You have been asked by your managing director to put forward to present at a young professionals conference organised by the CIOB. You have to submit the following essay to the organisers for final selection.
In the accompanying diagram (which represents the market for chocolate candy bars), the initial equilibrium is at the intersection of S1 and D1. a. Circle the new equilibrium if there is an increase in cocoa prices.
The wood specimen is to be loaded in a testing machine until it fails in tension. The ultimate normal strength of the wood is ?ult = 1800 psi and the ultimate shear strength of the wood is ult = 800 psi.
A bar (wih bending rigidity EI) is supported at A and B with length 2a. The bar is fixed at B (length=2a) with a pin support at A (length L=0). Additionally, at A is a torsion spring (spring constant Ca = EI/a) and an extension spring is attached at ..
Water flows through a pipe at 14cfs. At a point where the pipe diameter is 18in. the pressure is 30 psi; at a second point, further along the flow path and 2 ft lower than the first
A man having the mass of 77 kg sits in the chair which is pin-connected to the frame BC. If the man is always seated in an upright position, determine the magitudes of the horizontal and vertical reactions of the chair
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