Metals

Wastewater can be transformed into numerous products and/or resources can be recovered from wastewater such as www.eawag.ch

 

Another example is for chromium used in a variety of processes such as industries of metal-plating or leather tanning: thanks to specific filters and technology, chromium-6 (hexavalent chromium) bath can be re-used/re-cycled for few cycles of plating or dyes by filtering iron and other contents. This also enhances the quality of plating. The sludge that comes out after filtration can then be valorised safely into clean water and/or biogas and/or other outputs.