When people live in cities, sewage is collected and treated in municipal sewage reactors. In contrast to septic tanks, community sewage sludge reactors are aerobic, meaning that oxygen is present. Because they contain oxygen, aerobic sewage treatment facilities can treat a lot more sewage in a lot less time. The amount of sewage is determined by the amount of oxygen required by microbes to break down the sewage into carbon dioxide and water. Fertilizer Poop is recognized by some cultures as a valuable natural resource.
Night soil is spread on crops where it serves as a fertilizer.
If sewage is not disposed of properly it can pose serious health problems. More than 500 disease causing microbes are carried in poop. This bacterium is the cause of cholera which causes severe, but treatable diarrhea. This bacterium causes food poisoning. S. typhi bacteria per gram of poop.