---

Topic 5a - Water Treatment

---

Introduction

This section is about the treatment of water from rivers and other waterways to make it safe for human consumption.

When you complete each quiz you will be given a clearance code which you should note down for later use on the clearance page. At the end of the set of quizzes you should print out a copy of the clearance certificate and hand this in to your teacher as proof that you have completed the activity.

Contents

• The definition of potable water
• The coliform count
• Overview of the process of water treament

• Separation of solid material by sedimentation
• Clarification
• by precipitation (flocculation) and
• settlement
• Disinfection with chlorine

• Problems with chlorination

• Final treatment
• hardening of soft water
• removal of chlorinated organic compounds with activated carbon

• Quiz 1
• Quiz 2
• Quiz 3
• Clearance