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Given: average flow rate = .0022 m^3 /s (190 m^3 /d) Influent Substrate concentration = 250 mg/L as COD (all essentially soluble) Mean cell residence time is to be 5 days Volume of mix tank = 25 m^3 the reactors kenetic constants are: u(max)= 2.4 d^-1 , Ks = 75 mg/L as COD, Y=.4 VSS/g COD, k(d)= .096 d^-1 (K=u(max)/Y) a) What is the hydraulic residence time of the reactor? b) What is the COD removal efficiency of this system? c) What is the biomass concentration in the aeration Tank? d) What is the F/M ratio? e) What is the sludge production rate?
A delivery company accepts only rectangular boxes the sum of whose length and girth (perimeter of a cross section) are equal to 108cm. Find the dimensions of an acceptable box of a largest area.
The elastic modulus is 40 GPa, the yield stress is 150 MPa, the ultimate stress is 525 MPa, and the ultimate strain is 0.38 (mm/mm). Perform the following tasks for this material. compute the tangent modulus between yield stress and ultimate stres..
A 30-ft-high, 1-ft-diameter pipe is welded to the top of a cubic container 13 ft * 3 ft * 3 ft2. The container and pipe are filled with water at 20°C. Determine the weight of the water and the pressure forces on the bottom and sides of the contain..
Calculate the work necessary to compress air in an isolated cylinder from a volume of 6 ft^3 to a volume of 1.2 ft^3. The initial pressure and temperature are 30.0 psia and 50 degree F, respectively.
Air at 20oC and 1atm flows at 20 m/s past the flat plate . A pitot tube placed 2mm from the wall, develops a manometer head h=16mm of Meriam red oil (SG = 0.827), measured relative to atmospheric pressure.
A vertical curve is to connect two tangents that intersect at station 50+00 and the elevation 500.00ft. The back tangent gradient is -4 percent, the forward tangent gradient is 2 percent, and the elevation of the curve at station 48+50 must equal ..
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
suppose a family of four, living in a home with an area of 100x5oft connects its stormwater drain to the sewer. Assume that 1in of rain falls over 1 day. what percentage increase will there be in the flow from their house over the dry weather flo..
A bar with a circular cross-sectional area is made of SAE 1045 carbon steel having a yield stress of sY = 1000 MPa. The bar is subjected to a torque T=3.75 kNm and a bending moment M=7 kNm. Using a factor of safety FS=2 with respect to yielding
The break up of a liquid jet into droplets of diameter d depends on the jet diameter D, the jet velocity V, viscosity Mu, density rho,and surface tension sigma.
Ammonium (NH4+) is a weak acid with a pKa of 9.26. The dissociation is: NH+4 NH3 + H+. Calculate the mass of ammonium added to 1 L of water in order to obtain a pH of 4 at equilibrium.
to apply shock loading to an artillery shell, a 20kg pendulum A is released from a know height and strikes impactor B at a known velocity v (theta). impactor B then strikes the 1 kg artillery shell C.
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