A Look into the Water Treatment Process

Jacelyn Rice
Grade Level: 
National Science Education Standards: 
1. Science as Inquiry 2. Science in personal and social perspectives
Arizona State Science Education Standards: 
S1C1- Observations, Questions and Hypotheses S1C2- Scientific Testing (Investigating and Modeling) S1C3- Analysis, Conclusions and Refinements S3C1- Changes in Environments S3C2- Develop viable solutions to a need or problem
To introduce students to the grand challenge of supplying access to clean water and the measures taken here in the United States to provide clean water.

Supplying access to clean water is a grand challenge that is vital for the health and longevity of our world. Around the world there are more people who have died from lack in supply of clean water and sanitation, than from deaths associated with all the World Wars combined. It is important to note the processes that our society undergoes in order to supply water to our taps. Many other countries do not have access to clean water, especially not with the convenience of being delivered to tap. It is important to realize the intense treatment processes that our water is put through in order to be safe. Once one understands this in depth process, they are able to understand the difficulty in bringing these processes to undeveloped countries.
All waters, especially surface waters, contain both dissolved and suspended particles. The water treatment process includes processes such as coagulation, flocculation, and filtration in order to rid the water of its contaminants. Coagulation and flocculation processes are used to separate the suspended solids portion of from the water. The suspended particles vary in source, composition charge, particle size, shape and density. Due to this, many plants face the challenge of changing water characteristics that require the operator to adjust coagulant dosages. Different dosages of coagulants are tested using a jar test, to find the optimal dose to apply.

A Look into the Water Treatment Process.doc37 KB
Student handout.doc101 KB
WTP class pres.pdf1.11 MB