Educating for Sustainability
UNIT: Wastewater Context for Matter and Its Interactions
LESSON: Change of State and Wastewater Treatment
Part of a series of lessons in a unit called Wastewater Context for Matter and its interactions. Designed for middle school physical science, students will overcome the misconception that boiling is part of the wastewater treatment process.
Suitable for Grades
Satisfies Academic Standards:
Sustainable System Focus:
In wastewater treatment, many students may believe that boiling the water is a good option to making pure water. The misunderstanding that causes this is boiling purifies water. Although it may kill some harmful bacteria, it will not separate out the impurities without distillation. Distillation, although a good idea for small quantities of water, is not good for large municipal treatment plants because of the time and energy involved in heating the water.
- Boiling and freezing points are a unique property of a substance
- Water has a high heat capacity, so takes a lot of energy to heat it
- Time needed: 10 min
- Have discussion with students about the practicality of boiling water for municipal water treatment. Then, share that on a small scale, it is being done.
- Share the Janake Omniprocessor video. Discuss the benefits to the villages where it is being used, as well as the feasibility for scaling the tech up to the size needed for municipal level water treatment.
- After the lesson activities are completed have students add the Principle and Application to their notebook