Human waste disposal
What happens to excrement once we flush the toilet? Well, it goes to a sewage treatment plant and then it is converted into fertilizer. Plants can use this fertilizer so in a way you are re introducing this waste when you eat food grown by it.
Channels: Interesting Science Others
Tags: excrement poop cycle food
Uploaded by: guptava ( Send Message ) on 02-10-2014.
Duration: 3m 12s
