SU120500A1 - Water treatment plant - Google Patents

Description

Various schemes of installations are known using trash grids that purify water from natural water bodies for household and drinking purposes.

The proposed installation, which includes a settling tank and a sand-filled filter, differs from the well-known fact that a horizontal partition is used between the settling tank and the filter. sand filter and destroys film sediment, flushing them down the drain.

FIG. 1 shows a schematic of a water treatment plant — a plan view; in fig. 2 is a section along AA in FIG. one; in fig. 3 is a section through BB in FIG. }.

The installation has a housing /, in the lower part of which a supporting layer of gravel 2 and a filtering layer of sand 3 are loaded. A drain pipe 4 with openings for collecting filtered water is laid in the gravel. Above the sand layer there are perforated shields 5 and wooden flat shields 6, isolating the upper part of the installation from the bottom and being the bottom of the settler. The shields have hinged joints 7 with trays 8 and a flexible joint 9 between them. They rest on the walls of the hull, the supporting pillars 10 and can be rotated by means of P. manual winches.

In the middle of the settling tank, between continuous longitudinal shields, a channel 12 is located to remove sediment. In addition, in the sump there is a distribution chute 13 for supplying the water to be purified and a wall 14 separating the sump from the filter and forming a vertical connecting chamber 5 with the installation wall. The water being cleaned enters the sump via pipe 16 through the ball valve 17.

parts of the installation are: overlap 18, feed 1 pipe 20 and heat-insulating backfill 21.; directly adjoins the room in which the station times {not shown in the drawing), the regulator chamber 22, the filtering device with the float device 23 and the bactericidal water disinfection apparatus (not shown in the drawing).

When the cleaned water enters through the ball valve and the distribution tray in the sump, the suspended parts in it are lowered to the bottom of the sump. From the sump, water flows through a vertical connecting chamber, through the inlets 24, to the sandy surface of the filter. Water is filtered at a rate of one to two tenths of an hour per hour. In the upper layer of sand, at this rate of water, the bulk of the soil and bacteria forming the surface film is retained. Water, penetrating through a layer of sand and gravel, flows into the drainage pipe and enters the filtration rate control chamber, from where it enters the clean water reservoir through a bactericidal device.

When the filter is rinsed by means of a valve on the drain pipe, water filtration is stopped. Manual winches raise solid shields to form a gap between the shields and the wall of the installation. Water through these slots enters perforated shields and, penetrating through the holes, breaking into separate streams, destroys and washes away the surface contamination film and carries it into the pipe 25 and further out of the installation.

To clean the sedimentation tank from the sedimentary parts of the water to be purified, the shields are hoisted by winches until the sediment creeps into the channel, from where it is washed off with water.

When it is necessary to change the filter sand, the shields rise as high as possible; unloading and loading of sand are carried out through the upper charging port.

The principle of the upper washing of the contaminated layer of sand with low-pressure water jets with the removal of washed contaminants by a horizontal flow of water was tested under laboratory conditions. Recommended jet speeds range from four to half a meter per second.

Subject invention

A water purification plant comprising a sump and a sand-fill filter, characterized in that, in order to ensure periodic washing of the filter and increase the operating reliability of the plant, a horizontal partition is used between its sump and filter, the system includes rotary perforated shields through holes in which water is washed from the sump by separate streams enters the sand filter surface with raised solid bulkhead shields and, destroying film deposits, flushing leaks them down the drain.

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