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- Question : 1PT - A water storage tank receives a constant feed rate of 0.2 m3/s and the demand vru
- Question : 2PT - Solve Problem 1-1 assum.ing the feed rate is 0.33 m3/s and that the storage tank is a square with a cross-sectional area of 1600 m2
- Question : 3PT - A large tank having a floor area of 1000 m2 and a sidewall depth of 10 m is used as an equalization reservoir. Flow out of the basin is 0.3 m 1/s, while flow into the basin is 0.3[1 + cos 771/(43,200) 1113/s)]. Plot the hourly values of water depth versus time, assuming h = "
- Question : 4PT - Solve Problem 1-3 assuming the feed rate is 0.35[ I + cos 1r1/(43.200) m3/s], the flow out of the basin is 0.35 m3/s, and the floor area for the storage tank is 2000 m2. Plot the hourly values of water depth versus time, ;L~suming h = lz,, = 2 m at I = 0.
- Question : 5PT - Wastewater is being pumped into a 4.2 m diameter tank at the rate of 0.5 mJ/min. At the same rime, waler leaves the tank at a rate that is dependent on the height of the liqu id in the lank. The relationship governing the now from the tank is q = [2. l (m2/min) X h(m)]. If the tank was in itially empty. develop a relationship that can be used to define the height of the liqu.id in the tank as a function of time. What is the steady state height of the liquid in the t,rnk?
- Question : 6PT - Solve Problem 1-5 assuming the feed rate is 0.75 m1/min and the tank outflow is q = [2.7 (1112/min) X h(m)J.
- Question : 7PT - The follow ing data were obtained for four different reactants for the reaction A~ B + C. Determine the order of the reaction for one reactants (to be selected by instructor) irnd the value of the reaction rate constant k.
- Question : 8PT - A bimolecular reaction A+ 8 """7 Pis 10 percent complete in LO min. H the initial concentration of A and B is equal to I mole/L, determine the reaction rate constant and how long it will take for the reaction to be 90 percent complete.
- Question : 9PT - A bimolecularreaction A+ B """7 P is 8 percent complete in 12 min. lfthe initial concentration of A and B is equal to 1.33 molc/L, determine the reaction rate constant and how long it will take for the reaction to be 96 percent complete.
- Question : 10PT - The reaction rates at JO and 25
- Question : 11PT - lf two reaction rates differ by a facLOr on 2.4 and the activation energy,
- Question : 12PT - What is the difference in the reaction rates when the activation energy,
- Question : 13PT - The following values have been obtained for lhe rate constalll for the reaction A + B ~ P. Using these data, determine the activation energy E and the value of Lhe rate constant at I 5
- Question : 14PT - Solve Problem 1-13 for the following rate constant values. kw
- Question : 15PT - An aqueous reaction is being studied in a laboratory-sized complete-mix reactor with a volume of 5 L. The stoichiometry of the reaction is A-+ 2R, and reactant A is introduced imo Lhe reactor at a concemration of I mole/L. From the results g iven in the follow ing table, find the rate expression for this reaction. Assume steady-state flow.
- Question : 16PT - The rate of reaction for an enzyme-catalyzed substrate in a batch reactor can be described by the fol lowing relationship. kC r =---
- Question : 17PT - Solve Problem 1-16 for the following values: k equals 28 mg/L
- Question : 18PT - A wastewater is to be treated in a complete-mix reactor. Assuming that the reaction is irreversib le and first-order (r = -kC) with a reaction rate coefficient equal to 0.15 d, determine the flowrate that can be treated if the reactor has a volume of 20 m3 and 98 percent treatmem effic iency is required. What volume would be required to treat the flowrate determined above if the required treatment efficiency is 92 percent?
- Question : 19PT - For first-order removal kinetics, demonstrate that rhe maximum treatment efficiency in a series of complete-mix reactors occurs when iill the reactors are the same size.
- Question : 20PT - Determine the number of completely m.ixed chlorine contact chambers eacb having a detention time of 30 min that would be required in a series arrangement LO reduce the bacterial count or a treated eflluent from I 06 to 14.5 organisrns/rnL if the first-order removal rate constant is equal to 6.1 11-1
- Question : 21PT - Derive the integrated expression for a plug-flow reactor assuming the removal of the constituent in question can be described by retarded first order reaction [Eq. (1 - 53)'1 for the follow ing conditions n = I and 11 =fa I.
- Question : 22PT - Plot the ratio of required tank volume for a plug-flow reactor to that of a complete-mix reactor (VPFR/V 01R) versus the fraction of the original substrate that is converted for the following reaction rates. ,. = - k r = - kC05 r = -kC r = - kC2 What is the value of the required volume ratio for each of these rates when C = 0.25 mg/L and C,, = 1.0 mg/L'?
- Question : 23PT - Solve Problem 1-22 for the following values: C = 0.17 nig/L and C,. = 1.25 mg/L.
- Question : 24PT - If second-order reaction kinetics arc applicable (r = - kc:2), determine the effluent concentration for each of the reactor systems shown on Fig. 1-16. To simplify the computations, assume thal the following data apply. k = 1.0 ml/kg
- Question : 25PT - A portion of the outflow. o:Q, from an ideal plug-flow reactor is recycled around the reactor where a~ 0. Assume that the rate of conversion can be defined as r, = - kC. a. Sketch the generali:i:ed curve of conversion versus the recycle ratio. b. Sketch a family of curves showing the effect of the recycle ratio ex on the longitudinal conccnlration gradient. c. lf a complete-mix reactor were substituted for the plug-flow reactor. what effect would the recycle have on conversion?
- Question : 26PT - Determine the effect of recycle on the performance of a complete-mix reactor for first and second order reactions.
- Question : 27PT - De1ive an expression that can be used to compute the effluent concentration from a freesurface constructed wetland treatment system. designed as an ideal plug-tlow reactor, assuming the removal of the constituent in question can be described by a retarded second order equation. Assume the exponent 11 in the retardation term is equal to one. lf the value of the retardation coefficient r, is equal to 0.2. compare the effluent concentration with and without retardation. Assume the following values a lso apply: C,, = I. k = 0.1, and t = I.

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