RU1825643C - Contact clarifier - Google Patents

Abstract

SUMMARY OF THE INVENTION: in the contact clarifier, on top of the sand filter layer, there is a stop layer of lighter coarse-grained material, pressed by a pressure grate, to which a load of ballast floats located between the transverse trays above the level of the filtrate is transferred, through rigid rods attached to the floats and to the pressure grate with uniform distribution over it. The contact clarifier housing has an expansion section extending through the narrowing section into a vertical section with an area equal to the dimensions of the pressure grate and the area of the filter layer. This section is combined with the walls of the trays located around the perimeter of the housing. Above the level of the trays, the walls of the body are raised to the upper level to which the floats rise during washing. At this level, additional trays are located around the perimeter of the walls of the tank to discharge light foamy dirt. 4 sludge. Yo

Description

The invention relates to methods of filtering water, in particular to filters with a sand filter layer, to contact clarifiers.

The purpose of the invention is to increase the productivity and washing speed.

In FIG. 1 shows a section of contact clarifier, longitudinal section; figure 2 is the same, a top view, figure.Z - section aa in figure 2; figure 4 is the same during washing.

The walls of the housing 1 of each section of the contact clarifier have an expansion section 2 with a subsequent narrowing section 3, turning into a vertical section 4, which is the wall of the main prefabricated trays 5, located along the perimeter with a slope to the exit To the trays 5

 transverse trays 6. Above the trays 5, the walls rise and end around the perimeter with additional trays 7 having a slope towards the exit. There is a large valve 8 and a small valve 9 located on the bypass in the feed water supply. The gravelless distribution system consists of perforated pipes 10, covered by inverted trays 11. On top of the filter load 12 is a layer of persistent loading of coarse-grained material 13 lighter than sand, which is pressed by a grid 14 connected by rigid rods 15 to cylindrical ballast floats 16 (mainly from pipes) forms. The valve 17 is for the filtrate, the valve 18 and the pipe 19 are for draining dirty wash water.

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The device operates as follows.

During filtration, the source water flows bypass through the valve 9 (with the valve 8 closed) to the distribution system 10.11 and passes up through the sand

12, in which the dirt is cleaned. As accumulation in the sand, the flow resistance increases and the pressure of the feed water has to be increased. In traditional contact clarifiers, such an increase in pressure is very limited (since the maximum filtration rate should not exceed 6 m / h), otherwise the sand will start to rise, swell and dirt may enter the filtrate. There is no such danger in the proposed one, because sand is supported on top by a layer of coarse material

13, which is pressed by the grating 14, and the load of rods 15 and ballast floats 16 transferred to the grating. The purified water is poured evenly over the entire filter loading area through the trays 4, 5 and is discharged through the gate valve 17. Thus, the filtering sand capacity increases significantly and rinses are less frequent.

When flushing, the shutter 17 is first closed and the water rises slowly. In this case, the pop-up floats 16 raise the grating 14. When raising the water level to overflow into the tray 7, the grating 14 occupies the upper position (see Fig. 4) outside the vertical section of the walls 4 without creating gaps around the perimeter, due to the presence of a narrowing transition 3 from the extension 2 to the vertical section 4. After that, the flushing valve 8. is opened. Water swells the sand 12 and begins to wash out the dirt, lumpy lighter material 13 rises to the grate 14. First of all, the lightest dirt is washed away in the form of foam, which is discharged through the top Khni tray 7 through the pipe 19 into the sewer. After the foam leaves, the valve 8 is opened more and at the same time the valve 18 is slightly opened to such an extent that the water in the tray 7 almost does not overflow. At the same time, the washing flow rate increases and heavy dirt is discharged into the sewer through the valve 18. Despite a significant increase

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washing speed, the removal of the finest sand does not occur, since in the extended section 2 the speed decreases. Due to a significant increase in the speed of the wash water, the washing efficiency of the sand is significantly increased and the time is significantly reduced, as a result, the total flow rate of the wash water is reduced.

At the end of washing, the valve 8 is closed, the water level begins to fall, the drop rate is controlled by pressing the valve 18 down. Together with the lowering of the level, the floats 16c are lowered by the grate 14, but the sand is lowered ahead of it, followed by the loading of the lump. After lowering the level to overflow into trays 5. 6 the grate 14 is pressed against the layer 13 with the transfer of ballast cargo 16. After a few minutes, the CO is switched to the filtration mode, i.e. open the valve 17 and close the valve 18.

Claims (1)

SUMMARY OF THE INVENTION A contact clarifier comprising a housing with an expanding upper part, a lower distribution system, an upper collecting system in the form of main trays located along the perimeter of the housing above its expanded part, a lower layer of fine-grained filter media and an upper layer of coarse-grained material placed in the housing having a density lower than the loading density, and a pressure grid having means for reciprocating movement, characterized in that, in order to increase the producer rinsing and washing speed, it is equipped with vertical walls with additional prefabricated trays attached to the upper part of the body, the means for reciprocating movement of the grill is made in the form of ballast floats located between the main and additional trays and rigidly attached to the grill by means of vertical rods, trays located in the housing and made with a vertical wall, while the cross sections of the grating and the housing between the vertical walls of the trays are made the same. P tD Yu CN 00 $ G -AT / ( l-d  s, ". ; .l--. G. .; ....-. / .... 4 jg 7/7 // 7 FIG. B . nv u / u I Y y I j v- I i111 J LT i Щ- ™ TT / j11гд v ; j .//, ih I