Problem 2At a Cleanup site, a contaminated ground was dug out and treated in a completely mixed aerated lagoon.The following information is collected using a completely mixed batch reactor in a laboratory.Assuming a first-order reaction.a) Estimate the rate constant, k.b) The time required to achieve 95% reduction in the original concentration.c) Estimate the initial concentration at t=0.Time(days)530Waste Concentration (mg/L)500100

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Answered: Problem 2 At a Cleanup site, a…

Sustainable Energy

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Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy

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Problem 20P

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1. A CM reactor receives influent containing 10 mg/L of tracer dye for 2 hours. The tracer addition is terminated but the flowrate of water is maintained. The volume of the reactor is 10 L and the flowrate is 2 L/hr. What is the concentration of tracer in the reactor 1 hr after the dye addition is terminated? The reactor had an initial concentration of tracer of 1 mg/L when the tracer addition commenced.
7. A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a Superfund site. To determine the time that will take to treat the contaminated soil, a lab completely mixed batch reactor is used to gather the following data. Assuming a first-order reaction, estimate the rate constant, k and determine the time (t) to achieve 99% reduction in the original concentration. Time (day) Day 1 Day 16 Note that the 1st order batch system follows, C = Coekt Waster Concentration (mg/L) 280 132
A Pump & Treat water treatment system at a contaminated site is designed to treat 5 m3/d of ground water in a reactor designed as a well mixed system. The effluent must meet quality standards of 25 mg/L of Iron. The treatment reactor’s 20 m3 volume is believed to be insufficient to achieve the standard. The ground water has an iron concentration of 100 mg/L and the treatment reactor has a kinetic constant of 0.5 d-1. – Confirm that the treatment system will NOT meet the effluent quality standards. – If not modify the design by adding a PFR system (using same treatment process and kinetics), what volume should the PFR addition be?
For a completely mixed activated sludge reactor treating municipal wastewater, we can assume the following kinetic and operating parameters: Maximum specific growth rate (μmax) = 3 day-1 Yield = 0.6 mass cells/mass BOD5 utilized Half-velocity coefficient (KS) = 200 mg/L Decay coefficient (KD) = 0.06 day-1 Influent substrate concentration (S0) = 400 mg/L MCRT = 5 days Reactor volume = 3 ML (million liters) Wastewater flow rate (Q) = 10 MLD (million liters per day) Returned activated sludge flow rate (QR) = 5 MLD Calculate the substrate concentration in the effluent (S), cell concentration in the reactor (X), sludge production rate (QWXW), hydraulic retention time (θH), waste sludge flow rate (QW), F/M ratio, and clarifier size.
The volume of a CFSTR is 45 m' and average constant flow in the reactor is 300 m /d. The reactor flow regime was established by feeding continuously 6 g/L stock tracer solution in the influent line at a rate of 125 L per day. Determine the theoretical tracer concentration in the effluent at 3 and 10 h after the tracer injection. Plot the tracer profile as a function of (a) concentration versus t, and (b) C/Co versus t/0.
You are considering available options to meet new effluent quality standards for a particular contamination being treated at your plant. Currently you are operating with two reactors connected in parallel as shown in Figure 1(a). One reactor is a plug flow reactor (PFR), the other is a completely stirred tank reactor (CSTR). The following information is available: Design flow, Q: 60 L/min Influent concentration, Co: 10 mg/L Order of reaction: 1st Order Decay constant, k: 0.25 min! Volume of PFR, Vp: 360 L Volume of CSTR, Vc: 2280 L Using the above information, determine: a. The residence time, t, in each reactor; b. The effluent concentration from the PFR; C. The effluent concentration from the CSTR. d. The resulting effluent quality with the two reactors in parallel. You want to investigate whether operating these reactors in series will allow the required effluent standard of 0.25 mg/L to be met. You are therefore proposing the new configuration for the reactors shown in Figure 1(b)…
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