# Disinfection

Course Objective: To teach learners about disinfectants and disinfection including mathematics of chlorination and how chlorine inactivates pathogenic organisms using the CT concept.

This course, part of the Water Treatment Fundamentals bundle, focuses on disinfection. 4 Contact Hours (or 0.4 CEUs) will be granted upon completion of this course.

Disclosure: None

Upon completion of this course, learners will be able to:

List…

✓ common chlorine compounds used for disinfection

✓ properties of chlorine gas

✓ safety equipment used in handling chlorine gas

Define…

✓ disinfection

✓ log removal requirements for conventional treatment

Explain…

✓ disinfectant byproduct formation

✓ disinfection residual requirements

Describe…

✓ equipment and appurtenances for feeding chlorine gas

✓ chlorine chemistry

✓ chloramine chemistry

✓ breakpoint chlorination chemistry

✓ the procedure to estimate acceptable chlorine residual levels to meet CT and minimize THM formation

Calculate…

✓ log removal value and percent removal

✓ disinfectant dosage

✓ available disinfectant concentration

✓ chlorine demand and chlorine residual

✓ CT value

Apply…

✓ disinfectant byproduct reduction procedures

Use…

✓ safety precautions in handling chlorine cylinders

Compare…

✓ effectiveness of different disinfectants in meeting CT requirements

1. Relationship between Log Removal and Percent Removal

B. Log Removal Requirements for Conventional Water Treatment

1. SWTR/IESWTR Log Removal Requirements

C. Determining CT Compliance for Chlorine Disinfection

1. Calculation of CT Ratio

D. Chlorine Chemistry

1. Chlorine Gas

2. Hypochlorite

3. Control Tests

E. Properties of chlorine gas

F. Safety precautions in handling chlorine gas cylinders

1. Safety precautions in handling 150 lb cylinders

2. Safety precautions in handling ton (2,000 lb) cylinders

G. Equipment and Appurtenances for Feeding Chlorine Gas

H. Safety Equipment

1. Proper Safety procedures

I. Chloramination

J. Breakpoint chlorination

K. Computations: Mathematics of Chlorination

DISINFECTION QUESTIONS

## Course Progress

Lesson Content
0% Complete 0/12 Steps