Microbiology is a branch of biology-- the study of plants and animals--that deals with microorganisms. Microorganisms are living things, like bacteria and viruses, so tiny you need a microscope to see them. Because the sewer water has microscopic organisms living in it that are harmful to humans, we need to get rid of them. To do this, we can use the help of some good microorganisms. The sewer water already contains these good microorganisms, so we just need to encourage them to eat the bad ones.
Air is blown into the sewage water. And if enough oxygen blows through the sewage water, the good microscopic organisms will eat up and decompose the bad contaminating organic matters in the sewage.
After this, more sludge settles down at the bottom, and clean water goes to the top. About 95 percent of organic wastes should be removed by this method.
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