Membrane station waste treatment process

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 9/00 (2006.01) C02F 1/28 (2006.01) C02F 1/44 (2006.01) C02F 1/52 (2006.01) C02F 9/02 (2006.01) C02F 9/04 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2667701

The invention relates to a water treatment process comprising a first pre-treatment step which produces pretreated water and sludge, wherein said pretreated water undergoes at least one filtration step, at least one of which is a membrane filtration step, and wherein said filtration step produces waste, characterized in that said waste derived from said membrane filtration step undergoes a treatment phase which includes at least one coagulation-flocculation step followed by a second decanting step which produces sludge, wherein said coagulation-flocculation step is preceded by at least one step of adsorption onto said sludge derived from the pretreatment or the decanting step, wherein said adsorption step is aimed at removing the phosphonates contained in said water derived from said membrane filtration step.

L'invention a pour objet un procédé de traitement d'eaux, comprenant une première étape de prétraitement produisant une eau prétraitée et des boues, ladite eau prétraitée subissant au moins une étape de filtration dont au moins une sur membrane, ladite étape de filtration produisant des rejets, caractérisé en ce que lesdits rejets issus de ladite étape de filtration membranaire subissent une phase de traitement incluant au moins une étape de coagulation-floculation suivie d'une deuxième étape de décantation produisant des boues, ladite étape de coagulation-floculation étant précédée d'au moins une étape d'adsorption sur lesdites boues issues du prétraitement ou de l'étape de décantation, ladite étape d'adsorption visant un abattement des phosphonates contenus dans lesdites eaux issues de ladite étape de filtration membranaire.

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