working principle of anionic polyacrylamide water absorption
Wastewater treatment - Wastewater treatment - Sludge treatment and disposal: The residue that accumulates in sewage treatment plants is called sludge (or biosolids). Sewage sludge is the solid, semisolid, or slurry residual material that is produced as a by-product of wastewater treatment processes. This residue is commonly classified as primary and secondary sludge.
A $710m (MXN9.3bn) wastewater treatment plant will be built in Atotonilco, Hidalgo, Mexico. The plant was agreed by national water commission of Mexico Conagua on 7 January 2010 with a consortium of companies. It is expected to be the largest wastewater treatment project in the country and one of largest of its kind in the world.
