The removal of phenol in an industrial waste stream by microorganisms can becharacterized as a first-order reaction. The reaction rate coefficient was measured ina batch system, k = 0.05 min¯¹. The proposed reactor size is constrained by existingprocess equipment to a square area 20 x 20 m. The effective liquid depth can be nogreater than 2 m. For a flowrate of 10 m³/min, what is the most efficient reactorconfiguration: a single CMF, 4 CMF's in series, or a PF reactor? Support yourdecision with computations.

Step 1: To determine the most efficient reactor configuration for the removal of phenol in the…

Answered: The removal of phenol in an industrial…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Environmental Engineering: Water Treatment Please consider each of the following points: a. Determine the required residence time for each reactor of 3 equal volume CSTRs in series given a zero-order reaction with a reaction rate constant, k = -5 mg/L hr. The influent concentration is 125 mg/L and 95% conversion is required across the three-reactor system. What is the total reactor system residence time? b. Determine the required residence time for a single CSTR given the same conditions. c. Determine the required residence time for a PFR given the same conditions. d. Why are all three residence time the same?
A power plant in rough terrain has a 100-m stack with an inside radius of 1 m. The plant emits 300 g/s of SO2 from the stack with an exit velocity of 10 m/s at a temperature of 120oC. Ambient temperature is 6oC and the temperature increases at a rate of 2 K/km. At 10 m above ground, surface windspeed is 1.5 m/s on a mostly cloudy night. Find the concentration (mg/m3) of SO2: Directly downwind at a distance of 2 km. At a point located 2 km downwind and 0.1 km off the downwind axis. At the point downwind where it is a maximum. Approximately how far from the stack does this occur?
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(5) [Text - problem 4.32] Solve for 50 and 95% efficiency Compare the reactor volume required to achieve 95% efficiency for a CMFR and a PFR for the following conditions: steady-state, first-order reaction, flow rate = 14 m³ day, and reaction rate coefficient = 0.05 day-¹.
Underneath a conventional plug flow reactor and a plug flow reactor with tapered aeration that both use sludge recycle, sketch graphs of DO, DO Uptake, S, and Xa, versus distance from the inlet of the reactor
1. Draw control volume diagram of reactors for each of the following conditions and write down the mass balance equations using different notations shown in figure: C, Qout Cin Qin V, C Reaction rate constant =k Figure: Sample CMFR/CFSTR showing influent and effluent flows, volume, reaction rate components. a) Steady state CMFR/CFSTR with conservative pollutant b) Steady state CMFR/CFSTR with non-conservative pollutant having first order growth rate c) Non-steady state CMFR/CFSTR with non-conservative pollutants having second order decay rate
3. A first order decay reaction is occurring in a single CFSTR. Dividing the reactor into two smaller CFSTRs that are operated in series (effluent from one serving as the influent to the other) reduces the overall mixing and therefore makes the flow more PFR-like. Because reaction efficiency is greater in a PFR than a CFSTR, we might expect that dividing the reactor would improve the efficiency. To test that hypothesis, consider a system receiving an influent with C = 100 mg/L of a reactant that undergoes a first order decay reaction with a rate constant of 0.1 min ¹. Assume that the system has a total hydraulic detention time of 1 hour, but that it can be operated in three different ways: as a PFR, a CFSTR, or as two CFSTRs in series with the detention time split equally between the two. Find the effluent concentrations for the three possible operating modes

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