Thread: What kind of project could I show my class about being an environmental engineer?

I want to make my speech very good, so I was wondering if there would be any cool demostrations I could add.

perhaps you could talk about how sewage goes to a wastewater treatment plant and then the water that comes out is practically clean enough to drink.
Environmental engineers are responsible to design systems to treat and purify wastewaters so they can be discharged back to the environment.