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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?
An emission control system for a new car costs $750 and reduces NOx emissions from 0.4 g/mile to 0.18 g/mile. Assume the car is driven 10000 miles per year, and the life of the emissions control system is 11 years
Two changes to the CAFE standard for US automobiles are being considered. A more conservative increase from 27.5 mpg in 2011 to 35 mpg by 2020 is supported widely in Washington. California and 13 other states + the District of Columbia hope to increa..
Calculate the final pressure, temperature when the nitrogen isreduced to that volume. What is the modulus of elssticity at thebeginning and end of the compression. k=1.4
The slope distance between two points is 72.665 m, and the difference in elevation between the points is 1.120 m. Compute the horizontal distance.
Annual rainfall over the watershed is 36 inches and the annual runoff from the catchment is 12 inches. Evaporation from the reservoir averages 40 inches per year. The municipal water demand equals 100 million gallons per day
An approach to a pretimed signal with a 60 sec cycle has nine vehicles in the queue at the beginning of the effective green. Four of the nine vehicles in the queue are left over from the previous cycle.
list the order in which the components would be assembled. Is the system glazed from inside the building or outside? How can you tell?
After falling from rest from a height of 32 m, a 0.45 kg ball rebounds upward, reaching a height of 22 m. If the contact between ball and ground lasted 1.5 ms, what average force was exerted on the ball?
major project project reinforced soil wall design ltbrgtintroduction ltbrgtyour project group is required to design a
Determine the maximum allowable temperature rise if the allowablecompressive stress in the copper is σ(allowable) = 19,500 psi.
An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank.
Show how Kh, and Kow can be used to describe Koa. You must show how the concentration units for all equilibrium distribution ratios either cancel or remain to give the final value for Koa. Octonal-air partitioning coefficient (Koa = C(octanol)/C(a..
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