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1.A hi-vol clean filter weighs 18.00 g. After a 24 hour sampling period the filter is removed and weighs 18.65 g. The initial flow rate through the filter was 2.5 m3/min. When the filter was removed the flow rate through the filter was 1 m3/min. What is the concentration of particles in the air?
A) 0.29 ?g/m3
B) 2.90 ?g/m3
C) 29.0 ?g/m3
D) 290 ?/m3
E) 2900 ?g/m3
2.An activated sludge system treats 1500 m3/day of raw wastewater with a BOD of 250 mg/L. The reactor volume is 375 m3. The kinetic parameters were determined to be: ? = 3 day-1, Y = 0.55 kg SS/kg cells, and Ks = 150 mg/L. If the required effluent BOD is 15 mg/L, what is the mixed liquor suspended solids concentration?
A) 2500 mg/L
B) 2000 mg/L
C) 1000 mg/L
D) 500 mg/L
E) 250 mg/L
3.A flow of 125,000 gallons per day enters a sedimentation basin which is 20 feet wide, 60 feet long and 12 feet deep. What is the minimum settling velocity of a particles that will be 100% removed by the basin? (There are 7.48 gallons per cubic foot)
A) 0.05 ft/hr
B) 0.5 ft/hr
C) 5.0 ft/hr
D) 0.5 ft/day
E) 5 ft/day
4.A large power plant emits 1,500 kg SO2 per day into a neutral atmosphere with a wind speed of 4 m/s. A town is located 5 km away from the plant, 5 degrees east of the wind direction. If the effective stack height of the plant is 100 m, and the ground reflects the SO2 emission perfectly what is the SO2 concentration at a sampling point located 2 m above the ground in the town.
A) 1 x 106 ?g/m3
B) 1 x 103 ?g/m3
C) 1 ?g/m3
D) 1 x 10-3 ?g/m3
E) 1 x 10-6 ?g/m3
develop a simple urban constructed wetland design guidelines and drawings. your report should include the followingi.
A 600 MW power plant has an efficiency of 36 percent with 15 percent of the waste heat being released to the atmosphere as stack heat and the other 85 percent taken away in the cooling water. Instead of drawing water from a river, heating it, and ret..
After the copper mass is added, the final temperature of the mixture is 38 degrees Celsius. By checking the mass, it is determined that 1.2 grams of water evaporated. What was the temperature T
material for an earth fill was available from a borrow sites at a cost $ 6 .4 per cubic meter and a void ratio of 0.8. in the compacted state the fill measured 100,000 m^3 at a void ratio of 0.7.
On a 20 ft cantilever beam, Load W1=200 or W2=500 or both may be applied at the midpoint B or at the end of the beam C. The bending moment induced at th fixed support A, MA, will depend on the magnitude of the loads at B and C.
What is the shape of a water droplet from a leaking tap. How does that shape change before and after dropping from the tap. What properties of fluids play a role in this change in shape.
The lubbock board of city development has decided to ask the city council to construct a tunnel under the snowcapped mountain range east to downtown lubbock so that out of town visitors can reach historic prairie dog town.
THE VERTICAL ANGLES WERE READ AT BOTH ENDS OF THELINE AND THEN AVERAGED USING A CO-AXIAL THEODOLITE/EDM COMBINATION.IF THE ELEVATION OF THE INSTRUMENT STATION IS 630.15 FT
The stationary disk, of 300 mm radius, is attached to a pin support at D. The disk is held in place by the brake ABC in contact with the disk at C. The hydraulic actuator BE exerts a horizontal 400 N force on the brake at B.
Assume you are observing traffic in a single lane of a highway at a specific location. you measure the average headway and average spacing of passing vehicles as 3 seconds and 150 ft, respectively. calculate the flow, average speed, and density of..
The rectangular beam is 18 ft long and subjected to a uniformly distributed dead load of 1.5 kip/ft (not including the beam weight), a live load of 1.5 kip/ft, and a load of 2 kip/ft by earthquake effect.
The saturated unit weight of the clay is 20kN/m 3 and that of the sand 19 kN/m 3 ; above the water table the unit weight of the sand is 16.5 kN/m 3 . Calculate the effective vertical stresses at the top and bottom of the clay layer.
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