Disinfection Kinetics Quiz

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What is the purpose of disinfection or sterilization in water treatment?

To increase the pH level of water

To soften the water

To kill harmful disease-producing bacteria (correct)

To remove suspended particles from water

Which law describes the reduction in microorganisms when exposed to a disinfectant?

Newton's Law

Boyle's Law

Brewster's Law

Chick's Law (correct)

What effect does excess lime have on bacteria in water treatment?

It makes the water more acidic, which is beneficial for bacteria growth

It helps bacteria multiply

It has no effect on bacteria

It makes the water excessively alkaline, which is detrimental to bacteria survival (correct)

Why is boiling water not a practical method for disinfection of large amounts of water?

Boiling large amounts of water takes a long time and is impractical Signup and view all the answers

What happens to ozone in water treatment?

It breaks down into normal oxygen and releases nascent oxygen Signup and view all the answers

Why is lime removed from water after disinfection before supplying it for public use?

To prevent excessive alkalinity that can harm bacteria Signup and view all the answers

What is the reference level used for head loss computations in the treatment plant?

Water surface at the influent of the first treatment unit Signup and view all the answers

When can flow by gravity not be achieved in a treatment plant?

If total available head is less than the headloss through the plant Signup and view all the answers

What does the head loss through the treatment plant comprise?

Head losses in treatment units and connecting piping Signup and view all the answers

Which of the following is NOT included in the head losses through the treatment unit?

Head losses due to bends and fittings Signup and view all the answers

What contributes to the total loss through connecting pipings, channels, and appurtenances?

Head loss due to contraction, friction, and free-fall surface allowance Signup and view all the answers

When should hydraulic profiles be prepared in a treatment plant?

At peak and average design flows, at minimum initial flow, and for all main paths of flow through the plant Signup and view all the answers

What is the role of nascent oxygen in water treatment?

It removes organic matter and bacteria Signup and view all the answers

According to the Enzymatic hypothesis, how does chlorine act as a germicide on bacteria?

It kills the enzymes essential for metabolic processes Signup and view all the answers

What forms the free chlorine residual in water treatment?

Hypochlorous acid and hypochlorite ion Signup and view all the answers

What is the consequence of excess free chlorine after all ammonia nitrogen has converted to monochloramine?

Oxidation through breakpoint reactions Signup and view all the answers

What is the stoichiometry when hypochlorous acid reacts with ammonia in water treatment?

$1/10C5H7O2N + HOCl \rightarrow 4/10CO2 + 1/10HCO3- + 1/10NH4++ H+ + Cl- + 1/10H2O$ Signup and view all the answers

How are chloramines removed in water treatment?

Breakpoint reactions with excess free chlorine Signup and view all the answers

In water treatment, what reaction can increase the chlorine demand by reacting with reduced iron at corrosion sites?

$1/10C5H7O2N + OCl- \rightarrow 4/10CO2 + 1/10HCO3- + 1/10NH4++ Cl- + 1/10H2O$ Signup and view all the answers

"Plant layout" in water treatment refers to:

The arrangement of designed treatment units on the site Signup and view all the answers

"Siting" in water treatment involves:

"Character, topography, and shoreline selection" of a site Signup and view all the answers

"Site development" for a treatment plant should aim to:

"Take advantage of existing site topography" Signup and view all the answers

Disinfection Kinetics Quiz

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Questions and Answers

What is the purpose of disinfection or sterilization in water treatment?

Which law describes the reduction in microorganisms when exposed to a disinfectant?

What effect does excess lime have on bacteria in water treatment?

Why is boiling water not a practical method for disinfection of large amounts of water?

What happens to ozone in water treatment?

Why is lime removed from water after disinfection before supplying it for public use?

What is the reference level used for head loss computations in the treatment plant?

When can flow by gravity not be achieved in a treatment plant?

What does the head loss through the treatment plant comprise?

Which of the following is NOT included in the head losses through the treatment unit?

What contributes to the total loss through connecting pipings, channels, and appurtenances?

When should hydraulic profiles be prepared in a treatment plant?

What is the role of nascent oxygen in water treatment?

According to the Enzymatic hypothesis, how does chlorine act as a germicide on bacteria?

What forms the free chlorine residual in water treatment?

What is the consequence of excess free chlorine after all ammonia nitrogen has converted to monochloramine?

What is the stoichiometry when hypochlorous acid reacts with ammonia in water treatment?

How are chloramines removed in water treatment?

In water treatment, what reaction can increase the chlorine demand by reacting with reduced iron at corrosion sites?

"Plant layout" in water treatment refers to:

"Siting" in water treatment involves:

"Site development" for a treatment plant should aim to:

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