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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 :
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Upgrading of by-products:
flotation in slaughterhouses ;
fiber recovery from paper mills.
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Lower treatment costs for concentrated effluents:
desulfurization of refinery waste soda.
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Detoxification before biological treatment:
removal of chromes, solvents and sulfides....
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Pre-application treatments
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