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Clarification of hard water/loaded surface water such as urban/industrial waste water by flotation, comprises injecting coagulant in the water, and injecting flocculating additive in the water to agglomerate suspension particles
Clarification of hard water/loaded surface water such as urban/industrial waste water by flotation, comprises injecting coagulant in the water, and injecting flocculating additive in the water to agglomerate suspension particles
The process for clarification of hard water or loaded surface water such as urban or industrial waste water by flotation, comprises injecting a coagulant (1, 1a) of 10-70 wt.% in the water to be treated, injecting (B1) a flocculating additive (30-90 wt.%) on the water to agglomerate suspension particles in the form of flocs (3), and mixing the flocculated water with an emulsion of micro-bubble gas e.g. air in an apparatus. The raw water has a turbidity of higher than 100 NTU, and a concentration of suspension materials higher than 100 mg/L. The process for clarification of hard water or loaded surface water such as urban or industrial waste water by flotation, comprises injecting a coagulant (1, 1a) of 10-70 wt.% in the water to be treated, injecting (B1) a flocculating additive (30-90 wt.%) on the water to agglomerate suspension particles in the form of flocs (3), and mixing the flocculated water with an emulsion of micro-bubble gas e.g. air in an apparatus. The raw water has a turbidity of higher than 100 NTU, and a concentration of suspension materials higher than 100 mg/L. A 50% of the total dose of the coagulant is distributed for each two injections. The microbubbles emulsion is obtained by pumping a fraction of clarified water and by pressurizing the water in a balloon to dissolve a great quantity of air and to generate the microbubbles by expansion of the liquid pressurized in the flotation apparatus. The pressure of water in the balloon is reduced to 4 bars, and size of the microbubbles is 60 mu m. The clarified water is evacuated at the bottom of the flotation apparatus. An independent claim is included for an installation for clarification of hard water or loaded surface water such as urban or industrial wastewater by flotation.
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