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A community produces 250 MGD of a wastewater having a BOD concentration of 225 mg/L. This community is required to install a treatment process that will reduce the BOD concentration to 25 mg/L prior to discharge. The community is considering the possibility of using an activated sludge system to achieve the requirement. Assume that the influent VSS concentration is negligible, KS is 60 mg BOD/L, kd is 0.07 day-1, µm is 5 day-1, and Y is 0.65 mg VSS/mg BOD. Assuming a VSS concentration of 2,000 mg/L in the aeration basin, what is the volume (in cubic meters) of the aeration basin?
The end caps are spherical. The cylinder has length of 30 inc., a diameter of 8 in., and a wall thickness of 0.125 in. Determine the stress in the wall at two points A and B. For each, draw the stresses on a 3-D element. Treat the upper cap as spheri..
The rigid bar of negligible weight is supported as shown. Find the stress in each rod if the temperature rises DeltaT after a load P is applied. Use the following data: area of steal rod 320mm2, bronze rod 1300mm2, thermal expansion coefficient Al..
Design a single angle strut connected to a gusset plate to carry 180k n factored load. The length of the strut between center to center intersection is 3m.
If an additional 11ft lane is added (each direction) and all other factors stay the same, what will be the new level of service?
disk of radius R=7 in. spins at a constant angular speed of w=500rpm in the clockwise direction. If the disk is released from rest far above the ground, what are the speed and acceleration of the disk's top C point after it has fallen h=3ft
Trips can be classified by productions/attractions or origins/destinations. Which classification provides the direction of travel. Describe the product/outcome (e.g., production-attraction matrix) after each of the 4-step transportation planning pr..
the flow into the lake is from is from a stream is 300 m3/d andthe flow into the lake from runoff averages 20 m3/d. The lake is used for fishing by the local residents but the pesticides from local farms may damage the fish population.
If the maximum allowable compressive stress of timber is 7MPa, what is the minimum available size of square section post required. (give dimensions as well as area). Please show working.
the jib crane is supported by a pin at c and a rod at ab if the load has a mass of 2Mg with its com located at g determine the horizontal and vertical components of the reaction at the pin c
What are the effects of hardness, hot strength and hot hardness and work hardening of work materials
The company would like to distribute the songs between the two CDs such that the used space on each CD is about the same. Formulate the problem as an IP, and find the optimal solution.
Estimate the steady state PM10 concentration assuming a PM10 deposition velocity of 0.12 cm/s, prevailing wind velocity of 2.5 m/s, and a constant emission flux of PM10 0.82 mg/m2-s.
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