But this rarely happens. The waste is usually disposed of in some other manner. Landfills are one solution, but in many countries they are filling up and closing down. Also, landfills can leak toxins into groundwater and methane into the atmosphere making both of them harmful. They are not foolproof either.
Sewage systems are very expensive, use lots of water, and sometimes mixed with industrial chemicals.
When mixed with the chemicals, reuse of the waste becomes difficult and often hazardous. This may seem a little bleak, but there are some solutions that can be put into practice to help close the organic loop. Composting is one solution. By returning our food scraps and yard clippings to the soil, soil structure would improve, nutrients would be supplied, and diseases would be suppressed. Also, waste facilities would have less pressure placed on them.