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A wastewater treatment plant has a flow of 35,000 m3/day. Calculate the mass of sludge wasted each day (QwXw, expressed in kg/day) for an activated-sludge system operated at a solids retention time (SRT) of 5 days. Assume an aeration tank volume of 1,640 m3 and an MLSS concentration of 2,000 mg/L.
ABC is a triangular tract of land. The 1.5 tract DEFG is to be subdivided. AE is 480ft and DC is 350 ft. Determine the lengths of DG and CB. (Note 1 acre= 43,560 f^2)
Compare the physical migration of workers during U.S. industrialization and present-day intellectual transition into a new type of workforce.
Explain how the presence of the collimation error, e, can be detected in a "Two Peg Test" operation.
Briefly explain the difference between piezometer and tensiometer with respect to the working principle, special design consideration and limitation of the instrument.
The barrel has an inner diameter of 4ft. Neglect its wall thickness. Assume that only the hoops resist the water pressure. Note: Water develops pressure in the barrel according to Pascal's Law, p=62.4 lb/ft^2, where z is the depth from the surface..
For satisfactory operation, the static pressure at the pump inlet must not be lower than -6 m of water gage. Determine the smallest standard commercial pipe that will give the required performance.
Plot the stress-strain curve and determine the proportional limit, modulus of elasticity (i.e., the slope of the initial part of the stress-strain curve), and yield stress at 0.2% offset. Is the material ductile or brittle
A 50-kg iron block at 80C os dropped into an insulated tank that contains 0.5m^3 of liquid water at 25C. determine the temperature when thermal equilibrium is reached.
A large tank is used to calibrate the reading from a flow meter. Measurements of the system weight as a function of time are made. Water enters the tank vertically from the flow metering system at a speed of 20 ft/sec through a 1.5 in.
The bar under the applied force is now 2.448 meters long. Calculate the following for the bar: a) engineering stress, b) engineering strain, c) true strain, d) Young's modulus, e) What additional information would you need to calculate the true st..
The power output of the turbine is just 0.1 kW. If the process is adiabatic and steady, what is the required flow rate of air through the turbine if the exit state is 100 kPa and - 53 C.
A town is going to upgrade its primary WWTP to a secondary plant that can meet the effluent standard of 25 mg/L BOD5 and 30 mg/L suspended solids. They have selected a CSTR activated sludge system for the upgrade.
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