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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?
Compute the maximum acceptable tensile load Pu, on an angle L6x4x3/4 when connected to both legs. The 4 in. leg contains a single gage line of 7/8in. diameter bolts, and the 6in.
Alkaloids are chemical compounds containing nitrogen that can be produced by plant cells. In an experiment, an insulated closed vessel 1.673 m3 in volume was injected with a dilute water solution containing two alkaloids: ajmalicine and serpentine.
A reverse osmosis plant desalinates 5*10^6 L/day of feedwater containing 1500 mg/l of salt, yeilding 3*10^6L/day of product water with 75 mg/l of salt. What would be the salt concentration be in the brine
A projectile is launched with an initial speed of 200m/s at anangle of 60degree with respect to the horizontal. compute thedistance "R" as measured up the incline.
What is the maximum length of trench that can excavated by hand economically rather than by a trenching machine. it cost 900.00 to transport a trenching machine to the job and back to the storage yard
Design the beam in US customary units using f'c=4ksi and fy=413.4MPa. If necessary use d'=2.5in. Assume an exterior exposure according to ACI 318 and b=15in.
Compute the rates needed if the steam is generated in a low-pressure boiler without cogeneration. Assume that for each, 20?C liquid water is pumped to the required pressure and fed to a boiler.
The pressure inside a 4 cm hose is 700 kPa. If the water exits through a 2 cm diameter nozzle, what velocity in m/s, can be expected inside the hose ?
A rectangular concrete channel (n=0.015, S_o = 0.005) has a bottom width of 6.0 m and a discharge rate of 25 m^3/s. 1) Compute the normal depth y_n 2) Compute the critical depth y_c 3) Compute the minimum specific energy E_min
The footing has a f'c=3000psi. Assume the the footing base is 5 ft below the grade and the soil is 100 lb/ft with an allowable pressure of 4500lb/ft fy=60,000
The channel entrance is rounded and smooth (negligible head loss at entrance), and the reservoir water surface is 2.5 m above the bed of the channel at the entrance. hf=0.00019*Q2, where Q (in m3/s) is the discharge in the channel.
A W14x34 section is used as a simply supported beam over a span of 20 ft. The beam is loaded with a concentrated live load of 10 kips at the center of its span, in addition to its own weight.
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