4. Pre-application treatments

4.1 Separate treatment of elementary effluents

These treatments involve the specific purification of one or more separately collected effluents and are justified by :

• Upgrading of by-products:

  • flotation in slaughterhouses ;

  • fiber recovery from paper mills.

• Lower treatment costs for concentrated effluents:

  • desulfurization of refinery waste soda.

• Detoxification before biological treatment:

  • removal of chromes, solvents and sulfides....