The sludge (organic and inorganic solids) treatment is designed to reduce the quantity of solids that are generated as the by products of primary, secondary, and tertiary treatment systems. The treatment comprises of thickening, conditioning and dewa More...

The Russian region of Chelyabinsk, blighted by decades of nuclear waste dumping and accidents, has embarked on a controversial campaign to clean up its image on the internet. Here is a list of the ten most polluted places in the world. 1. More...