PROCESS AND DEVICE FOR PURIFICATION TREATMENT OF LIQUID EFFLUENTS, IN PARTICULAR AQUEOUS LIQUID EFFLUENTS, BY PHOTOCATALYSIS

摘要

The invention relates to an improved process/device for purification treatment, by photocatalysis, of aqueous liquid effluents comprising at least one pollutant. In this process: (a) a suspension consisting of the effluent to be treated and loaded with particles of a photocatalyst is used and/or prepared; (b) the suspension of effluent to be treated, loaded with photocatalyst particles, is circulated in a reactor which has an inlet and an outlet and which comprises at least two zones; (c) a stream of air bubbles is diffused within the suspension circulated; (d) a photoactivation is carried out using irradiation means placed in the reactor; (e) the liquid phase is separated from the solid phase of the treated effluent by filtration; (f) then this liquid phase of the treated effluent is recovered. This process is characterized in that (i) the reactor used comprises at least two zones; (ii) it is seen to that the stream of gas bubbles is diffused within only one of the two zones: the aerated zone, and generates a gas lift which makes it possible to obtain recirculation between the two zones and hydrodynamic behaviour of perfectly stirred reactor (PSR) type.