Waste derived from human activitirs, such as rapeseed placentiform from the extraction of rape oil;fruit faeces from the extraction of fruit juice;chicken excrement from the scall farming of chickens.

摘要废弃为满足自身需要的产，如菜饼来自于菜，果渣来自于水果汁，鸡粪来自于规模化养鸡。