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During a BOD test, 2 mL of waste water having a DO of 0 was mixed with 298 mL of dilution water having a DO of 8.9 mg/L. After 5 days and 20 days, it was noted that the DO of the test bottle was 4.0 and 2.5 respectively, and that the oxygen concentration of dilution water oxygen concentration of dilution water dropped to 8.7 mg/L and 8.6 mg/L respectively. What is the BOD5 in this case? During routine analysis it was found that the water contains 30 ppm of ammonia. Determine the actual CBOD and NBOD of wastewater. Can you find BOD10 from this test?
Determine the mass and specific volume of argon gas in a vessel at 150 kPa and 20°C. The vessel is spherical, with radius 5 m.^5
At a wastewater treatment plant, FeCl3 (s) is added to remove excess phosphate from the effluent. Assume the following reactions occur: FeCl3(s) Fe3+ + 3Cl- Fe3+ + PO4 (3-) FePO4 The equilibrium constant for the second reaction is 10^26.4.
Two strips of a plastics material are bonded together as shown. The average shearing stress in the glue must be limited to 1000 kpa.
Consider the components that are required for an automobile. List 5 components and identify the class of material that is used for each component. What are the critical properties that allow for the function of the material in that application
The volume flow rate of streams into the pipe is given by QA = 0.02t m 3 /s and that of stream B by QB = 0.008t 2 m 3 /s, where t is in seconds. The exit area of the pipe is 0.01m 2 . Find velocity and acceleration of the flow at exit at t = 1s.
The solid circular disk of uniform thickness is released from rest on the 60-degree incline. Calculate the angular velocity w of the cylinder and the magnitude v of the velocity of its center C after it has moved 10 ft down the incline.
Two different fluids flow over two identical flat plates with the same laminar free-stream velocity. Both fluids have the same viscosity, but one is twice as dense as the other. What is the relationship between the drag forces for these two plates
A tubular aluminium bar (G=28GPa) of square cross section with outer dimensions 50mm x 50mm must resist a torque T=300Nm. Calculate the minimum required wall thickness t_min if allowbale shear stress is 20MPa
Assuming constant acceleration, determine how long the train blocked the crossing. Dis- regard the width of the crossing.
what is effect of packing factor in self compacting concrete?
A container of volume 0.04 m3 contains a mixture of saturated water and saturated steam at a temperature of 250oC. The mass of the liquid present is 9 kg. Find the total mass, quality of steam, specific volume, specific enthalpy, and specific inte..
a gate having cross section shown in fig closes an opening 5 ft and 4 ft high in a water reservoir. The gate weighs 400lb and its center of gravity is 1 ft to the left of AC and 2 ft above BC. Determine the horizontal reaction that is developed on..
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