METHOD AND DEVICE FOR SCRUBBING EFFLUENTS
First Claim
1. A method for scrubbing liquid effluents laden with dissolved or undissolved organic and/or inorganic substances and continuously fed at a flow rate Df, characterized in that, after a prior effluent flotation operation, if this is required, at least one treatment cycle is carried out, said treatment cycle comprising a first step, in which a radical oxidation and/or a radical reduction of the effluents is carried out by circulation in a first compartment generating very strong turbulence, and then a second step, in which the undissolved substances contained in the effluents are agglomerated by coagulation/flocculation before circulation of these effluents in a second compartment having a free surface, with scraping of the sludge obtained in the upper portion, while bubbling and maintaining a weak turbulence in said compartment.
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Abstract
The invention relates to a method and to a device for scrubbing liquid effluents laden with dissolved or undissolved organic and/or inorganic substances and continuously fed at a flow rate Df. After a preliminary effluent-floating operation if required, the method comprises carrying out at least one treatment cycle, the treatment cycle including a first step in which the effluents are subjected to an electrolytic treatment by circulation in a first compartment while generating a very strong turbulence, followed by a second step in which the undissolved elements contained in the effluents are agglomerated by coagulation/flocculation before circulating the effluents in a second free surface compartment, with the scraping of the sludge carried out at the upper portion, while bubbling and maintaining a reduced turbulence in said second compartment.
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Citations
34 Claims
- 1. A method for scrubbing liquid effluents laden with dissolved or undissolved organic and/or inorganic substances and continuously fed at a flow rate Df, characterized in that, after a prior effluent flotation operation, if this is required, at least one treatment cycle is carried out, said treatment cycle comprising a first step, in which a radical oxidation and/or a radical reduction of the effluents is carried out by circulation in a first compartment generating very strong turbulence, and then a second step, in which the undissolved substances contained in the effluents are agglomerated by coagulation/flocculation before circulation of these effluents in a second compartment having a free surface, with scraping of the sludge obtained in the upper portion, while bubbling and maintaining a weak turbulence in said compartment.
- 18. An installation for scrubbing liquid effluents laden with dissolved or undissolved organic and/or inorganic substances, and continuously fed at a flow rate Df, characterized in that it comprises at least one first set of two successive vertical compartments, namely a first compartment provided with means for the radical oxidation and/or radical reduction of the effluents and comprising means for generating very strong turbulence in said first compartment, and a second compartment, having a free oxidation/separation surface designed to maintain weak turbulence in said second compartment, said second compartment being provided with external coagulation/flocculation means, with scraping means in the top portion, and with bubbling means, the compartments communicating with each other in the bottom portion.
Specification