Nanomaterials describe, in principle, materials of which a single unit is sized (in at least one dimension) between 1 to 1000 nanometres (10−9 meter) but usually is 1 to 100 nm (the usual definition of nanoscale).
A self-sustaining dairy wastewater treatment plant that uses treatment by-products to power itself and recycles waste solids and water could revolutionise water purification.