Abstract
The following technological stages, naming: the wood griding, washing and screening as well as the recovery of the sodium salts, generate sulphate waste waters which are characterized by a highly polluting chemical composition and high biodegradable because of the presence of lignin components. The reduction of the polluting degree is possible because of the flocculation technologies applied in acid medium with a mixture of reacting substances like phosphoric acid and diammonium phosphate.
Cuvinte cheie
sulphate water
depollution
lignin flocculation