Cengage Advantage Books: Sustaining the Earth 10th Edition by Tyler Miller,Scott Spoolman

تمرين 12

What is a septic tank and how does it work? Describe how primary sewage treatment and secondary sewage treatment are used to help purify water. Describe John Todd's living machine and how it treats sewage. List six ways to prevent or reduce water pollution. List five ways in which you can reduce your contribution to water pollution.