Have the students make a poster to raise awareness about the issue of sewage. Split them into groups of 2 or 3 and have them pick three pieces of information that really stood out for them and that they felt other people should be aware of.
When the biodegradable wastes enter the water supply, they become a food source for aerobic bacteria (oxygen using bacteria). If a large amount of waste is present, then a lot of bacteria can feed on it.
