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A rectangular well-mixed aeration lagoon is 60m long, 5m wide, and 2m deep. It receives 400 cubic meters/day of wastewater with a BOD5 of 336mg BOD5/L for treatment. The biodegradation rate constants for the wastewater are yield coefficient = 0.8mg VSS/mg BOD5, endogenous decay constant=0.08 d^(-1), maximum specific microbial growth rate =1.10 d^(-1), and the half velocity constant = 76.0mg BOD5/L. What is the efficiency of the pond? The pond's efficiency depends on oxygen being always available for the microbes to use in degrading the wastewater organic carbon. How much oxygen (in kg) must be supplied daily to the pond?
The jib crane supports a load of 750 lb from the trolley which rides on the top of the jib. The members of the crane are pinned together at B, E, and F and supported by a short link BH.
Calculate the overall modulus of the composite, explaining your calculations and the assumptions you have made when it is loaded:
What is the equation to get the table if used excel formulated , in construction methods each Columbus station end-area cut end-area fill volume of cut volume of fill stripping cut stripping fill total cut total fill adj-fill algebraic sum mass ordin..
How much extra water does a 21.5 ft, 175-lb concrete canoe displace compared to an ultra-lightweight 38-lb Kevlar canoe of the same size carrying the same load?
The partial pressure of the gasses in a 22,414-L volume of air at STP are: oxygen, 21,224 kPa; nitrogen, 79,119 kPa; argon, 0.946 kPa; and carbondioxide, 0.036 kPa. Determine the gram molecular weight of air.
Determine the IRR of building the corrosion-resistant tower. (Hint: Calculate interest rates from 7% to 11% using formulae provided in tables).
A rural freeway has an ideal free-flow speed of 120 km/h and two 3.6 m lanes in each direction, with right shoulder lateral clearance of 1.2 m. Interchanges are spaced approximately 5 km apart. Traffic consists of 10 percent trucks and buses and 8..
A monorail train starts from rest on a curve of radius 400 m and accelerates at the constant rate a_t. If the maximum total acceleration of the train must not exceed
Include a description of the types of property markers used as well as any problems a surveyor may encounter in this process in your explanation. In addition, discuss the minimum alignment required to establish the centerline
The owner wish to achieve an initial acceleration from rest of 15 ft/s^2 on a level paved surface. What is the maximum coefficient of road adhesion needed to achieve this acceleration
determine the dilatation and change in volume of the 200mm length of the rod if A) the rod is made of steel E=200 Gpa v=.30 B)the rod is made of aluminum E=70 Gpa v=.35.
Find the live load capacity, Pl of a beam with f prime c=4 ksi, fy=60 ksi, Wd=self weight, beam width b=18 inches, beam height h=24 inches, effective depth=21 inches, concrete unit weight=150 pcf, steel As=3-#9 bars.
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