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A 1.0 × 106 gallon reactor is used in a sewage-treatment plant. The influent biochemical oxygen demand (BOD) concentration is 100 mg/L, the effluent BOD concentration is 25 mg/L, and the flow rate through the reactor is 500 gal/min.
(a) What is the first-order rate constant for decay of BOD in the reactor? Assume that the reactor can be modeled as a comply mixed flow reactor (CMFR). Report your answer in units of per hour.
(b) Assume that the reactor should be modeled as a plug flow reactor (PFR) with first-order decay, not as a CMFR. In that case, what must the first-order decay rate constant be within the PFR reactor?
A body weighing 120 lb with a flat surface area of 2 ft^2 slides down a lubricated inclined plane making a 30 degree with the horizontal. For a viscosity of 0.002 lb*s/ft^2 and body speed of 3 ft/s, determine the lubricant film thickness.
A sample of soil was compacted into a 945 ml.laboratory mold. The mass of the compacted soil was 1850 grams and its moisture content was 13.1%. Specific gravity of solids is 2.70, Compute the moist unit weight, dry unit weight, and degree of satu..
A man having a weight of 167lbattempts to hold himself using one of the two methods. Determine the total force he must exert on bar AB in each case and the normal reaction he exerts on the platform at C.
An eighteen inch diameter sandstone column is subjected to an axial compressive force of 2x10^6 lb / ft. Find the factor of safety based on the ultimate compressive force. For the ultimate compressive stress of sandstone=85Mpa.
Also calculate the deflection of the beam to check that it complies with the design limit of L/200. Only variable actions are required for deflection check.
Groundwater in Taupe, Arizona, initially contains 1.8 mg/L of iron(III). What must the pH be raised to in order to precipitate 0.3 mg/L of the iron (T=25°C)
The number of parking tickets issued in a certain city on any given weekday has a Poisson distribution with parameter = 50. What is the approximate probability that 1 between 35 and 70 tickets are given out on a particular day
Determine the lengths and bearings of the sides of a closed polygon traverse whose corners have the following x and y coordinates: A(5000.00, 5000.00) B(5289.67, 5436.12) C(4884.96, 5354.54) D(4756.66, 5068.37)
A soil sample is prepared in the laboratory by mixing a certain amount of dry soil with 10.5 wt% water. The relative density of the grains of the material is equal to 2.7.
At a temperature of 9°C, a 2-mm gap exists between two polymer bars and a rigid support. Bars (1) and (2) have coefficients of thermal expansion of t1 = 102 x 10-6 /°C and t2 = 66 x 10-6/°C, respectively.
If you were asked to perform an excavation contract competitively with limited data, what type of contract would you want and why?
A rigid 1ft^3 vessel contains R-134a originally at -20F and 27.7% quality. The refrigerant is then heated until its temperature is 100F. Calculate the heat transfer required to do this, in Btu.
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