SU998369A1 - Apparatus for purifying fat-bearing effluents - Google Patents

Description

The invention relates to devices for the treatment of highly concentrated wastewaters, containing fats and suspended substances, and can be used for the treatment of wastewater by enterprises of the processing industry. There are facilities for biochemical treatment of wastewater.

Impeller-type flotation machines are known., They are used for cleaning grease-containing wastewater l.

The disadvantage of these machines lies in the presence of a rotating mechanism in the column of aerated liquid, which leads to the destruction of the formed flotation complexes and a decrease in the quality of the purified liquid.

Closest to the present invention is a device for purifying fat-containing waste water, including a housing with a conical bottom, equipped with an aerator and having a flotation cell located above the small porous aerator, supplying and discharging communications and airlift for feeding the treated wastewater from above to the foam layer 2.

A disadvantage of the known device is the inability to delay

impurities that cannot float air bubbles in the foam layer or settle in the lower bunker part of the photomachine. Such contaminants are carried away with the purified liquid and thus deteriorate (and its quality.

The aim of the invention is to improve the quality of cleaning.

The goal is achieved

10 in that the device for cleaning grease-containing wastewater, comprising a housing with a conical bottom, equipped with an aerator and having a flotation cell located above the aerator,

15 is provided with a container installed in the housing with a vertical partition attached to its walls dividing the container into a pre-aeration chamber and a flocculation chamber,

20 large-pore filtering element mounted horizontally between the wall of the housing and the pre-aeration chamber, while in the wall of the chamber flocking is performed

Claims (2)

25, the overflow hole in the flotation cell, the filter element is installed below the overflow port, and the pre-aeration chamber has a means for feeding 30 active sludge. . 1 shows a schematic representation of the proposed device, a longitudinal section / in FIG. 2 - section A-A in FIG. 1, FIG. 3 is a top view. The device consists of a housing 1 in which a tank with a vertical partition 2 is built, not under the bottom, which divides the tank into the chamber 3 of the preliminary aeration of the waste water with means for supplying excess activated sludge and the chamber 4 of the flocculation. In the pre-aeration chamber 3 there is a large-bubble aerator 5. A flotation chamber 6 is also located in the housing. The air in the flotation chamber is pumped directly under the foam layer through the chalk aapatop, consisting of two rows of perforated rubber tubes 7. For collecting the foam product and its allotment 8 precast foam trays are provided. The supply of the mixture of v-Cameria 3 flocculation to the foam layer is carried out through the distribution window 9. A coarse porous filter element 10 installed below the water level in the flotation chamber on the supporting grid 11 is provided for holding the flotation impurity in the flotation layer. For collecting the cleaned waste water is provided for collecting tray 12. To collect the precipitated sediment, the device is equipped with a pyramidal bunker 13 ,. the precipitate from which is discharged through pipeline 14. The device is designed as follows. Sewage water, together with excess activated sludge, is fed into the pre-aeration chamber 3, where it is aerated with air supplied from the common blower, through the aerator 5. The mixture of waste water with activated sludge enters the chamber 4, from below, where the formation and strengthening of active sludge flakes occurs. , on the surface of which parts of 1.sl of pollutants in wastewater are adsorbed. The silt mixture from chamber 4 is flooded through the distribution window 9 and is applied onto the foam layer from above into the flotation cell 6, where the flakes of active sludge and particles of contaminants are floated with finely dispersed air bubbles. Air is blown directly under the foam layer from the bottom through the perforated tubes 7. Forming,; during flotation, the froth product is drained into the collection trays 8 of the foam and removed for further processing. Sewage water released from contamination is directed to the lower part of the device between the perforated tubes 7 of the aerator. In the silt bin 13, sedimentation of contaminating particles occurs in the flotation cell 6. The waste water is directed from the silt bin to the upper part of the device, and the filter element 10 is passed through the filter. The waste water is collected in collecting tray 12 and discharged from devices. The precipitated sediment from the silt bin 13 is discharged through line 14 for further processing. The economic effect from the introduction of the proposed device will be 1,0008.7 thousand rubles. per year by improving the quality of treatment, reducing energy consumption and rational utilization of excess activated sludge, thereby forming biochemical treatment plants. Apparatus of the Invention A device for cleaning grease-containing waste water, comprising a housing with a conical bottom, equipped with an aerator and having a flotation cell located above the aerator, characterized in that, in order to improve the quality of cleaning, it is equipped with a vertical partition attached to its stacks dividing the tank into a pre-aeration chamber and a flocculation chamber, with a large-pore filter element mounted horizontally between the wall of the housing and the chamber before aritelnoy aeration, wherein a flocculation chamber wall provided with an opening for the overflow of liquid into the flotation chamber, the filter element is mounted below the overflow opening and pre-aeration chamber has means for supplying the surplus activated sludge. , Sources of information taken into account in the examination 1. Pesenkoš I. B. Investigation of wastewater treatment of enterprises of the fat industry. Author. dis. on the competition academic degree to-tech. sciences. L., LISI, 1967. 2. Meshkerov N.F. Flotation maiyush. M., Nedra, 1972, p. 41 S 7A-A A j. 3 uh in and -1 oiAPJO, W Fm & /  " / five I FLG./