Determine the daily primary sludge production during the following wastewater treatment with these operating characteristics:

Flow = 5000 gpm (gallons per minute)

Influent SS = 180 mg/L

Removal efficiency = 60%

Volatile solids = 70% of SS

Specific Gravity of volatile solids = 0.967

Fixed solids = 30% of SS

Specific Gravity of fixed solids = 2.4

Sludge solids content = 5.00%

What is a key difficulty to be overcome when selecting observed seismograms for the design of a structure? Briefly summarize two alternatives.

A ski lift carries a maximum capacity of 100 people/min to a height of 225 feet, calculate the electrical input power required of the motor to meet these conditions if the motor has an efficiency of 85%. Assume the average weight of each person is 160 lb.

A.) 50 kW

B.) 82 kW

C.) 96 kW

D.) 110 kW

1. Consider water flowing upwards through the 22.5^o reducing elbow (22.5^o angle to horizontal axis). If diameters of the elbow at entrance point and exit points are 0.02540 m and 0.01905 m respectively, elbow is 0.1 m high, velocities of water are 5 m/s and 9 m/s at entrance point and exit point respectively, and density of water is 1000 kg/m³_, moment flux correction factor = 1.02.
2. 1. Determine gage pressure at inlet
3. 2. Determine vertical component of force of the system, if weight of the system is 0.2 kg.

Describe what is capillary barrier and explain mechanism behind capillary barrier for solid waste disposal ?

Use 50,000 psi for the

yield stress of steel, and limit deflection to y max= span/360.

Factor of safety shall be evaluated based on Yield Stress.

Problem

1. Select the lightest beam to span 40 feet between supports. There is no load on the beam

A three storey structure having a square footprint of 225 m² is constructed on a clayey deposit. The structure is planned to be supported by square isolated footings having a width of 2m and spaced at 5m center to center. A typical borehole indicates that the soil consists of 2m fill layer at the top (g=17KN/m³) followed by a very stiff clay layer 2m thick (gsat=18.5KN/m³) underlain by a normally consolidated soft clay layer of 4.5m thickness (gsat=17KN/m³) followed by a rock layer extending down to the bottom of borehole. The foundations are laid on top of the stiff clay layer. Water table is located at the top of the stiff clay layer. Undisturbed samples were taken from the middle of each clay layer and consolidation tests done on undisturbed samples indicated the following:

 Stiff Clay: Cc=0.15; Cs = 0.02; P_c = 120 kPa; e₀=0.9

 Soft Normally Consolidated Clay: Cc=0.38; Cs = 0.06; e₀=1.0

a) Draw a sketch representing the various problem components.

b) The isolated foundations are subjected to a stress of 140 kPa. Calculate the consolidation settlement. Consider the very stiff clay as one layer and divide soft clay layer into two equal sub-layers. Calculate settlement under one typical foundation.

c) What would be the maximum additional stress applied on a central foundation from two neighboring foundations (situated at the left and right sides of the central foundation). Is it necessary to consider the additional stresses from neighboring foundations in the settlement calculations?

d) A concern is the differential settlement between isolated adjacent footings. It was decided to change the design to have the structure founded on a raft foundation subjected to a stress of 45 kPa. Compute the consolidation settlement and comment on the results.

A one-way solid concrete slab is to be used for a simple span
of 18 ft. In addition to its own weight, the slab carries a superimposed dead
load of 50 psf and a live load of 75 psf. Using the strength method with
f ′c = 4 ksi and fy = 60 ksi, design the slab for minimum overall thickness.

(account for weight of slab)

It is desired to use a 12-in.W-shape for a column to support a beam. Select a trial size for the column for the following data: column factored axial load from above is 485 kips, factored beam reaction is 100 kips, and unbraced column height is 18ft.

* Check the section found to see if it complies with
the AISC interaction equations for axial compression plus bending.* (Interaction Formula Check)

Explain the differences and similarities between City Beautiful, Modernism, Post-Modernism, and Post Post-modernism, cite examples and show examples. What period are we entering now?

Explain why change orders can result in an issue of ethics in construction. Essay format

A series of vertical curves connect a 3% upgrade, a 2% downgrade, and another 3% upgrade moving west to east. These curves are designed such that they connect directly to one another (i.e., the PVT of the first curve is the PVC of the second curve). If the design speed of the alignment is 60 mi/h, what is the elevation difference between the two road segments (i.e., the vertical difference between the PVC of the first curve and the PVT of the second curve)? (20 points)

A horizontal curve along a two-lane highway with 12-ft lanes is designed with a central angle of 29.93 degrees and a superelevation rate of 8 percent. The station of the PC and PI are 100+00.00 and 103+22.36, respectively. Given this information:

a. Determine the design speed of this curve. (12 points)

b. Calculate the distance that must be cleared from the center of the inside lane in order to provide sufficient stopping sight distance (8 points)