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You are designing a reactor that uses chlorine in a PER or CMFR to de-stroy pathogens in water. A minimum contact lime of 30 min is required to reduce the pathogen concentration from 100 pathogens L-1 to below 1 pathogen L-1 through a first-order decay process. You plan on treating water at a rate of LOOD gal min-1.
(a) What is the firssorder decay rate constant?
(b) What is the minimal size (in gallons) of the reactor required for a plug Row reactor?
(c) What size (in gallons) of CMFR would be required to reach the same outlet concentration?
(d) Which type of reactor would you select if your treatment objective stated that "no discharge an ever be greater than 1 pathogen L-1?" (Explain your reasoning.)
(e) If the desired chlorine residual in the treater water after it leaves the reactor is 0.20 mg L-1. and the chlorine demand used during treatment is 0.15 mg L-1, what must be the daily mass of chlorine added to the reactor in grams?
Given the data of Example 8.22. Instead of a load on the surface, compute the depth of an excavation to cause a reduction in stress at the bottom of the excavation of 250 kPa if p - 2 Mg/m3. The excavation plan area is shown in Fig. Ex. 8.22a.
An unknown fluid flows through a horizontal 35-mm-diameter pipe with a Reynolds number of 100,000 and a density of 680 kg/m3. The pressure drop across a 21-mm-diameter nozzle meter placed in the pipe is 4.2 kPa.
Steam leaves a nozzle with a pressure of 500 kPa, a temperature of 350?C, and a velocity of 250 m/s. What are the isentropic stagnation pressure and temperature?
An engine cooling system initially contains 16 quarts of a mixture of water and antifreeze, which is 30 % antifreeze on a volume basis. if its desire to be removed and replaced with pure (100%) antifreeze?
A hydraulic jump occurs in a rectangular open channel. The water depths before and after the jump are 0.6 m and 1.5 m, respectively. Calculate the critical depth.
Find the concrete cross-section and steel area required for a simply supported rectangular beam with a span of 20 ft that is to carry a computed dead load of 1.3 k/ft and a service live load of 2.25 k/ft. Material strengths are fc’ = 5000 psi and fy ..
A high strength steel is developed with a yield stress of 1460 MPa and a critical stress intensity factor of 30MPa(m)^0.5. Calculate the size of the initial flaw that will cause failure in an infinite plate when the load applied is 50% of the load..
What is the relation between reflection and transmission coeffients of a sea wall
a beam having an overall length of 24 has a 4 overhang at one end. the left support is a pin connection and the right
Soil falls from a conveyor belt into a cone shaped pile at a rate of 1000lb/min. The bulk density of the soil is 110lb/ft^3. The height of the pile is equal to the base diameter
An inventor claims to have invented an adiabatic steady-flow device with a single inlet-outlet that produces 100 kW when expanding 1 kg/s of air from 900 kPa and 300 degrees C to 100 kPa.
Assuming a standard driver reaction time of 2.5 seconds, what is the probability that the vehicle pulling out will get in an accident with oncoming traffic?
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