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1.85 Water and Wastewater Treatment Engineering Homework 2

The document describes two homework problems involving water treatment reactors. The first problem involves a plug-flow reactor treating wastewater with 150 mg/L of toxic organics at 380 L/min, with a first-order reaction rate of 0.4 hr-1. The second problem models a completely-mixed reactor with the same conditions. Both problems require calculating the detention time and reactor volume needed to achieve 20 mg/L effluent, and plotting percent removal versus detention time. The second also asks how many times larger the completely-mixed reactor must be to achieve 80% removal.

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177 views1 page

1.85 Water and Wastewater Treatment Engineering Homework 2

The document describes two homework problems involving water treatment reactors. The first problem involves a plug-flow reactor treating wastewater with 150 mg/L of toxic organics at 380 L/min, with a first-order reaction rate of 0.4 hr-1. The second problem models a completely-mixed reactor with the same conditions. Both problems require calculating the detention time and reactor volume needed to achieve 20 mg/L effluent, and plotting percent removal versus detention time. The second also asks how many times larger the completely-mixed reactor must be to achieve 80% removal.

Uploaded by

MuhammadUsman
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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1.

85 WATER AND WASTEWATER TREATMENT ENGINEERING


HOMEWORK 2

1.

A plug-flow treatment reactor has an influent flow with a concentration of 150 mg/L of
total toxic organics (TTO) and a flow rate of 380 L/min. The reaction is first-order with a
rate constant of 0.4 hr-1.
a) Determine the required detention time and reactor volume to achieve an effluent
concentration of 20 mg/L.
b) Plot the percentage of TTO removed as a function of detention time.

2.

A completely-mixed treatment reactor has an influent flow with a concentration of 150


mg/L of total toxic organics (TTO) and a flow rate of 380 L/min. The reaction is first-
order with a rate constant of 0.4 hr-1.
a) Determine the required detention time and reactor volume to achieve an effluent
concentration of 20 mg/L.
b) Plot the percentage of TTO removed as a function of detention time.
c) How many times larger than the plug-flow reactor must the completely-mixed
reactor be to achieve 80% removal?

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