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The kill of pathogens by disinfection in water treatment can be described by a first order reaction. Complete a reactor comparison for a batch reactor, CSTR and PFR for disinfection. The treatment plant produces 100 L/s of water. The starting concentration of pathogens is 20,000 organisms/L and the desired final concentration is 5 organisms/L. The reaction rate constant is 0.05 per second.
a) Determine the volume of reactor needed for each hydraulic regime.
b) From the volume, calculate a possible L x W x H for each tank. Are the tanks sizes reasonable?
c) Which design would you choose and why? (For the batch system, assume one batch reactor is filling while the other is reacting).
using darcy's law compute the quantity of flow, seepage velocity and contaminant loading of the river. ground water is flowing through unconfined uniform 3m thick sand aquifer and discharging to river.
Characteristic values of the shear strength parameters of the soil are c'= 0, and f' = 400. Determine the required width of the footing if a factor of safety of 3.0 against shear failure is specified when the water table rise to foundation level.
A fine-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of mmonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8 degrees C does not nitrify.
As an agronomist you have been approached by a large pepper farmer who wishes to determine an appropriate"yield goal" fot this season. He provides you with yield data for ten year period which indicates that his production has been slowly decreasi..
The cables A and B exert forces FA and FB on the hook. The magnitude of FA is 100 lb. The tension in cable B has been adjusted so that the resultant of the two forces is oriented perpendicular to the wall to which the hook is attached.
Assume the collector provides this energy to a thermal storage unit (a thermal reservoir) at 220oC. A heat engine receives energy from this thermal storage unit and discharges energy by heat transfer to the surroundings at 20 C
A cylindrical sample of soil 39 mm in diameter and 77 mm long weighed 180 g. The sample is not fully saturated and its moisture content was found to be 27.0%. Assume rS = 2.70 Mg/m3. Determine: a. the bulk density, r b. the dry density, rd c. the d..
The 1.2-Mg mine car is being pulled by winch M mounted on the car. If the winch generates a constant power output of 30 kW, and the car starts from rest, determine the speed of the car when t = 5s.
A force, 90 N in magnitude, is applied to control rod AB as shown. Knowing that the length of the rod is 225 mm, determine the moment of the force about point B by resolving the force into components along AB and in a direction perpendicular to AB..
explain the necessity of super elevation in the design of horizontal curve also prove that rv=v2/{g(fs+e)}
The following data are the temperatures (in °F) of effluent at discharge from a sewage treatment facility on consecutive days: 43 47 51 48 52 50 46 49 45 52 46 51 44 49 46 51 59 45 44 50 48 50 49 50
Start from the values for the density and the kinematic viscosity of CO2 at 15o C and standard atmospheric pressure (101.3 kPa), and first determine the value of the dynamic viscosity at the same conditions.
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