SU1636012A1 - Method and apparatus for washing granular charge of filters - Google Patents

Abstract

The invention relates to the purification of water by filtration and reduces the flow of wash water. In filter 1 a layer of filter charge 2 is placed, a drainage system 3, pipelines for supplying purified water 7, discharging wash water 8, supplying wash water 9 and draining filtrate 10. At the bottom layer 2 is placed patru-. side 11 for supplying the layer with atmospheric air When washing the layer, lowering the water level in the filter below filter layer 2 and draining water through the drainage system 3 and pipeline 10 ". At the same time, valve 12 is opened in pipeline 11 and the spherical air is fed into the load for increasing its volume in the pore space of the layer. When rinsing water is supplied through conduit 9, the upward flow displaces from the loading layer 2 the air that loosens the layer, 1 sludge, - 1 tab. with S (L

Description

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The invention relates to the purification of natural and aftertreatment of wastewater and can be used in the technology of water purification in open free-flow filters and contact clarifiers with a granular filter charge.

The aim of the invention is to reduce the consumption of wash water.

The drawing shows a device for implementing the method.

A filter loading bed 2 is placed in the filter housing 1, a drainage system 3 is located in the lower part of the housing, located in the supporting layer 4 "Tray 5 is located in the filter housing, a pocket 6 is attached to the housing, to which the pipelines for supplying the treated water 7 are attached and Discharge of wash water 8 “Pipelines for supplying wash water 9 are connected to the drainage system 3 and for filtrate 10 are discharged. Above the drainage system 3 in the lower part of the filtering layer 2 is placed a patrol 11 for supplying atmospheric air to sleep. adjoint valve 12,

The device works as follows

When the valves on pipelines 7 to 9 are closed and valves on pipe 10 and valve 12 on port I1 are open, the filter is emptied by lowering the water level in the filter bed to its lower part and draining water through pipe 10, while draining a small part through the port 11. The moment when water flows through the pipe 11 stops, indicates that the water level in the filter is located below the level of the pipe 11, t "e, below the filter layer 2" At the same time the air from the atmosphere through the pipe 11 At this moment, the valve on the pipe 10 and the valve 12 on the pipe 11 are closed, since it is not necessary to lower the level further to avoid accumulation in the supporting layers 4 and the drainage distribution system 3.

Then, the valves on the pipelines 8 and 9 are opened and an upward flow of water with an intensity of 50% of the intensity required for weighing the load is introduced. The air that has entered the charge through the nozzle 11 is displaced from the load by uniformly loosening it. knowledge, rises and overflows into tray 5, enters pocket 6 and is led through conduit 8 down the drain.

Increase the flush water supply before weighing the load 2 "In this case, the loading is finally closed Close the gate valves on pipeline 8 and 9, open the valves on pipelines 7 and 10 and turn the filter into filtering mode ,,

Example The method of washing the loading is carried out on three models of the filter D 100 mm. After filtering water through the granular loading of the filters under equal conditions, the loading of the loading is carried out in various ways: in filter A - the usual washing in an upward flow of water, in filter B - washing lowering the water level below the upper layer of the filtering load, followed by loosening the upper layer of the air load, displaced from the load by the upward flow of wash water and weighing the load, in filter B - washing by lowering water level below the filtering layer; supplying atmospheric air to its lower part to fill the vapor space, followed by loosening the entire layer with air displaced from the load by an upward flow of wash water and weighing the layer

The washing results are tabulated.

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365 352 303 43 41.5 35.7

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1.5 7.3 3.5 17

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A method and a device for washing the filter loading allows reducing the consumption of washing water by increasing the volume of air in the vapor space, as well as by draining water from the entire filter bed and feeding atmospheric air into its lower part.

Claims (1)

1. A method of washing a granular load of filters located on a supporting layer, including lowering the water level below the upper layer of the filter loading, diverting water through a drainage system located in the supporting layer, and then feeding upward flow360126 Wash water to loosen the filter bed and weigh it, in particular, in order to reduce the wash water consumption, the water level is lowered below the filter bed and the atmospheric air is fed to its lower part. 2 o A device for flushing an excessive loading of filters, including a drainage system located in the lower part of the filter housing, characterized in that in order to reduce the flow of washing water 15, it is equipped with a branch pipe with a valve for supplying atmospheric air to the loading, attached to the housing above the drainage system. ten