1) Waste treatment technology
Found on
https://www.crosswordclues.com/clue/tanwater
Tanwater was a special water treatment project initiated by Elmo tannery in Sweden in 1992. The aim was to reduce nitrogen effluent from the water treatment systems during the tanning of leathers. Previously tanneries in Europe have only been able to reduce nitrogen in the water by up to a maximum of 30%. The `Tanwater` project aimed at reducing.....
Found on
http://en.wikipedia.org/wiki/Tanwater
No exact match found.
