A complete-mixed activated sludge process (CMAS) is to be designed to treat 7.0 MGD ofprimary effluent having a BOD5 of 170 mg/L. The requirement is that the effluent BOD5 andTSS concentrations be 20 mg/L or less on an annual average basis. The following biokineticcoefficient obtained at 15°C: Y = 0.7 mg VSS/mg BOD5, k = 2.90 d-1, Ks = 80 mg/L BOD5,and kd = 0.043 d-1. Assume that the MLVSS concentration in the aeration basin is maintained at2,500 mg/L. Determine:a. The minimum MCRT (d)b. The MCRT necessary to meet the requirement (d)c. The volume of the aeration basin (ft3)

Effluent BOD5 = 170 mg/L TSS concentration = 20 mg/L Biokinetic parameters are, Y = 0.7 mg VSS/mg…

Answered: A complete-mixed activated sludge…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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The vapor leaving the top of a distillation column goes to a condenser in which either total or partial condensation takes place. If a total condenser is used, a portion of the condensate is returned to the top of the column as refcr and the remaining liquid is taken off as the overhead product (or distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the uncondensed vapor is taken off as the overhead product. The overhead product from an n-butane-n-pentane distillation column is 93 mole% butane. The temperature of the cooling fluid limits the condenser temperature to 39 °C or higher. REFLUX DRUM a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate as a partial condenser (i.e., at which it can produce liquid for reflux) b) The production rate of overhead product is 50 kmol/h, and the mole ratio of reflux to overhead product is 2:1. Calculate the molar flow rates and compositions of the reflux stream and the vapor…
Using a psychrometric diagram, describe the heating and humidification process from the following data. Initially the air was at dry bulb temperature (DBT) 25 ° C and RH 45%. The air is heated to DBT 75 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate: a. Change in absolute humidity of air from initial to final conditions = b. The change in air enthalpy from initial to final conditions =
A liquid is fed to a distillation column at 4 atm absolute pressure. Its composition as a mole fraction is: n-butane: 0.40, n-pentane: 0.25, n-hexane: 0.20, n-heptane: 0.15. Using the equilibrium distribution coefficients (K), find the temperature at which this liquid will begin to boil (bubble temperature). Calculate the concentration of the first vapor bubble formed.
Q.1// Moist air at volumetric flow rate of 280 m³/min and pressure (Pa) at (point 1) with DBT=30°C, R.H=50% (where Pa = Patm -Ps). The moist air passes over a cooling coil with dehumidifier and water vapor condenses. The air exit at (point 2) with saturated moist air at the temperature equal 10°C and moisture content 0.0076 kg/kg.dry.air. The atmospheric pressure equal 1.013 bar and partial pressure of saturated water vapor equal Pss= 0.04246 bar. Determine: (a) specific volume at the pressure of dry air, (b) mass flow rate of the dry air, in kg/min, and (c) mass water condensed. Where: P=pressure of dry air, Patm= atmospheric pressure, P,=partial pressure of water vapor. %3D
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Q.1) In the experiment, you wrap a piece of copper wire around your magnesium strip to suspend the magnesium inside the eudiometer. Why is copper wire a good choice for this task? Group of answer choices It conducts electricity very well It reacts strongly with the acid It does not react with the acid It is much heavier than Mg Part B) A 45 mL sample of a dry gas is collected at 380 torr and 25 °C. Calculate the volume of the gas sample (in mL) at STP. Part C)Using the data provided in Table 3 in the handout (also provided below), calculate the vapor pressure of water at 21.0 °C. Table 3: Vapor pressure of water at various temperatures T (˚C) P (mmHg) T (˚C) P (mmHg) T (˚C) P (mmHg) 0 4.58 16 13.63 26 25.21 5 6.54 18 15.48 28 28.35 10 9.21 20 17.54 30 31.82 12 10.52 22 19.83 40 55.3 14 11.99 24 22.38 50 92.5
Using the phase diagram here, at what temperature will a solution of 36 mole % A begin to boil? Temperature-Composition Phase Diagram for Compositions of Compounds A and B 500 450 400 350 300 250 200 150 100 50 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Composition (mole fraction B) Temperature (°C)
Solve the given sub-parts (a) If dry hydrogen gas at atmospheric pressure is burnt completely in a furnace with 32 % excess air, calculate the Orsat analysis of the flue gas from this furnace (b) furnace uses a coal the ultimate analysis shows 57.22 % C, 5.64 % H, 1.41 % N, 5.06 % S, and 14.67 % ash. If the sulfur in the ash is negligible and the excess air is 80 %, compute the Orsat analysis of the combustion gases.
Q1): Tw~362 K; Tn~342 K

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