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A water treatment plant treats a continuous flow rate of 50,000 m^3/day and plans to build a 10,000 m^3 tank to house an additional treatment process. The reaction occurring in the tank will remove nitrate according to first order decay with a rate of 0.25 per hour (12 hrs/day). The influent concentration of nitrate is 50 g/m^3.a) What will be the residence time of the tank?b) What will be the steady-state effluent concentration of an ideal CSTR?c) What will be the steady-state effluent concentration of two equally-sized (5,000 m^3 each), ideal CSTR's in series?d) What will be the steady-state effluent concentration for an ideal PFR? Assume dimensions of length = 500m, cross sectional area of flow = 20 m^3
What is the equation for average vehicle delay Is it averge queue over arrivals Average queue over average arrivals
Compute the maximum acceptable tensile service load T that may act on a single angle L6x4x3/4 that is welded along only one leg to a gusset plate; thus, there are no holes. The service load is three times the dead load. Solve for a0 A36 steel.
Natural gas is stored in very large vessels consisting of a floating tank and a liquid seal. The pressure in the tank is constant because the weight of the floating tank is constant. In the morning, the temperature of the natural gas is 300 K.
A block of material A is placed in closed contact with unlimited supply of material B, after 15 hours at temperature T1, it is observed that atoms of B have penetrated 0.5mm into material A.
A 1m diameter pipe bend is carrying water with a steady flow rate of 2 m3/s. The bend has an angle of 90o and lies in a horizontal plane. The volume of water in the bend is 1.5 m3 and the empty weight of the bend is 4 kN.
For energy conservation, materials with a high thermal capacity are effective in climates in which the heat flow through the building envelope is:
State the full name of the section of SOLAS that sets out the minimum standards for the training and competence of crew members and describe how the surveyor would go about checking that a vessel had the necessary number of qualified staff.
Of this total, 2000 acres are residential(CN=68), 500 acres are industrial (CN=88), and 2500 acres are forest with good cover (CN=55). For a design storm of with a total precipitation of 7 inches, estimate the direct runoff in inches.
A 2014 Ford Mustand convertible in 'Gotta have it Green Metallic' is retailing for $38,000. If you put $3,500 down on the vehicle, and obtain approval for a 2.19% car loan compounded monthly for 5 years.
The pressure inside the cylinder is 50 atm and temperature is 298o K. Provide your engineering judgement (with calculations) to justify or not justify the shipment of the cylinder.
What would be the resistance on a level road. What horsepower must be delivered to the wheels on the grade? If the efficiency is 80%, what must be the rated horsepower of the motor.
The effluent contains 20 mg/L of solids and 20 mg/L of BOD the biological treatment process produced .32 kg of bacterial solids per kg of BOD removed
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