Paper mill sludge as a by-product
Stora Enso Barcelona SA is a company dedicated to the manufacture of cardboard for several applications in the packaging sector. During the process of manufacturing cardboard from recycling, significant quantities of wastewater with a high content of solids (sands, fibers, mineral charges) and organic material are generated. These waters are treated in a treatment plant that has a primary treatment (physicochemical) and a secondary treatment (2 biological reactors). From these treatments, purified water and sludge are generated (13,000 t/ year).
Thanks to the composition of the sludge, with l