Degremont

Societe Lyonnaise Des Eaux Et De L'eclairage

Institut De La Filtration Et Des Techniques Separatives Foulayronnes

Francois Marie Fiessinger

Jean-Marie Rovel

Paul Thebault

Roger Ben Aim

Daniel Bourdiol

Daniel Codiasse

A filtration apparatus includes at least one tangential filtration module ving at least one filtration element defining a conduit arranged in a spiral configuration within an enclosure in the form of a body of revolution. The element defines a helicoidal slope for liquid to be filtered and causes such liquid to pass through the module along a helicoidal path. The liquid is tangentially filtered, and filtrate is delivered to the exterior of the module.

Tangential filtration apparatus and plant comprising such apparatus

Process for clarifying water to coagulate and flocculate particles suspended therein, by introducing into the water an aqueous solution of ferric polychloride having a temperature of at least 85.degree. C.

Process of clarifying water

The invention relates to a process for the purification of water intended for human consumption or industrial use, and a process for the clarification of urban or industrial waste water, by means of a solution of a polymeric aluminum hydroxide which is prepared immediately before its use by adding an alkaline or alkaline-earth hydroxide to an aluminum salt. The conditions of preparation are chosen so as to prevent the formation of monomeric aluminum hydroxide.

Process for purifying water

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Paris, France

Francois Marie Fiessinger