Process for treating waste from a membrane filtration plant

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/44 (2006.01) C02F 1/00 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2719170

The subject of the invention is a water treatment process, comprising a first pretreatment step that produces pretreated water and sludge, said pretreated water then undergoing at least one membrane filtration step that produces waste and a permeate, said permeate being conveyed to a potabilization system characterized in that said first pretreatment step comprises a first coagulation/flocculation step, and in that said waste resulting from said membrane filtration step undergoes a treatment phase that includes at least one second coagulation/flocculation step followed by a settling step that produces sludge, said settling step being preceded by at least one step of adsorption onto at least one portion of said sludge resulting from the pretreatment and/or onto a portion of said sludge originating from said settling step, said adsorption step targeting a reduction of the phosphonates contained in said waste resulting from said membrane filtration step, said process resulting in treated waste and in excess sludge.

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 ensuite au moins une étape de fîltration membranaire produisant des rejets et un perméat, ledit perméat étant acheminé vers une filière de potabilisation caractérisé en ce que ladite première étape de prétraitement comprend une première étape de coagulation-flocculation, et en ce que lesdits rejets issus de ladite étape de filtration membranaire subissent une phase de traitement incluant au moins une deuxième étape de coagulation-floculation suivie d'une étape de décantation produisant des boues, ladite étape de décantation étant précédée d'au moins une étape d'adsorption sur au moins une partie desdites boues issues du prétraitement et/ou sur une partie desdites boues provenant de ladite étape de décantation, ladite étape d'adsorption visant un abattement des phosphonates contenus dans lesdits rejets issus de ladite étape de fîltration membranaire, ledit procédé conduisant à des rejets traités et à des boues en excès.

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