Some waste treatment plants burn it or ship it to landfills, which aren’t the most economically or environmentally friendly solutions . But not all poop ends its life by fire or burial. Some human waste ends up in forests and farm fields as the treated, human-feces-based fertilizer known as biosolids.
Using human urine and faeces as fertiliser may seem an unappetising concept but it’s been common practice for centuries. In the sewage systems of today, which deal with millions of tonnes of domestic waste and industrial effluent, this human fertiliser comes in the form of treated sewage sludge .