Water and Wastewater Disinfection
Course Pack: Disinfection (Chlorine)
Pro’s and Con’s of Chlorine
Course Description
This module compares major chlorine forms—gas, liquid hypochlorite, and
calcium hypochlorite—highlighting their operational behavior, advantages, and limitations.
Learners explore secondary-disinfection roles, stability and storage considerations, and safety
expectations associated with each chlorine type. Applied examples help operators evaluate
appropriate chlorine selection for specific treatment and distribution scenarios.
Learning Objectives
1) Differentiate major chlorine forms
2) Identify advantages & disadvantages
3) Understand secondary disinfection roles
4) Recognize safety & storage requirements
5) Evaluate application scenarios
Agenda
1) Overview of chlorine types and their operational characteristics
2) Comparison of gas, liquid, and solid chlorine forms and their application considerations
3) Roles of chlorine in secondary disinfection and distribution‑system protection
4) Safety, handling, storage, and stability requirements for chlorine products
5) Application scenarios illustrating proper selection and operational performance
Target audience
Operators at the Operator 1–2 level learning chlorine product differences, safety practices, and application considerations.
Level
I, II
Learning material and method
Online on-demand
Assessment
Knowledge check and quiz (80% correct and above)
Instructor
Mike Harrington