SU1782627A1 - Filter for purifying liquids - Google Patents

Description

The invention relates to the field of purification of liquids by filtration, in particular, to filters with floating granular filter material and can be used to remove suspended solids.

A known filter for water purification, comprising a housing located in its lower part drainage distribution pipes for supplying the source and removal of washing water, sequentially placed stages of coarse and fine cleaning, one of which is made in the form of a floating loading layer installed in the housing, installed over > holding the partition with a bottle and means for removing the filtrate after each cleaning step, an annular chamber is made in the upper part of the casing, the fine cleaning step is made in the form of a chamber sealing rings of porous material, and retention baffle is made of impermeable material and provided with cassettes filled with granules of an inert material of different sizes in adjacent cassettes / auth. testimonial. USSR No. 1223957, B 01 D 23/10, publ.

However, this filter is not Collateral _l Chiva intensive cleaning filtruyu- 3 thin conductive surface cleaning stage, not to the conditions for output been cleared off the p * layer filtering contaminants from surfaces F STI step Hepa bypassing filtru-> L-resistant layer coarse . Not in the filter! “The entire loading layer works in a coarse cleaning stage. In the process of moving the loading granules during regenerations, they are abraded on the surface of the ring of porous material, for example, sintered titanium, which leads to a decrease in the loading volume. In addition, during abrasion of the granules on the rigid surface j of the ring, the porous surface of the ring becomes clogged by the particles of the granulated porous surface. All this reduces the dirt, filter bone, filtration area, the intensity of cleaning the surface of the fine filter by filtering the surface, increases the time of washing, and ultimately reduces the filter performance.

The purpose of the invention is to increase the performance * of the filter.

1782627 A1

This goal is achieved by the fact that in the filter for cleaning liquid containing a housing, a layer of floating granular loading for coarse cleaning located in it, an annular chamber attached to the outer wall of the housing with a filtering element for fine cleaning and a nozzle for draining the filtrate. And located at the bottom the housing is a prefabricated system, an annular chamber is located below the loading layer and its filter element is made of filter cloth.

The drawing shows a filter for cleaning liquid, a longitudinal section.

The filter contains a housing! filled with a floating granular load in the form of granules 2 / expanded polystyrene, etc. /, for rough cleaning, distribution device 3. located above the load. Below the loading layer is attached to the outer wall of the housing 1 an annular chamber 4 with a filter element 5 for fine cleaning, made of filter cloth / belting, etc., etc. /. The annular chamber 4 is equipped with a prefabricated perforated pipe 6 connected to a pipe 7 for draining the filtrate. In the lower part of the housing there is a prefabricated system for draining wash water and sediment, which consists of a perforated pipe 8 and a pipe 9. The filter element 5 is attached to the housing 1 by means of a fastening 10. Above the dispensing device 3, a pipe 11 is connected to the housing 1 for supplying a cleaned liquid .

The filter works as follows.

The liquid to be cleaned flows into the upper filter part of the housing 1 through the pipe 1! it fills and is filtered through floating granules 2, the filter element 5 and enters the annular chamber 4, from where, using a perforated pipe b and a pipe 7 for filtrate removal, it is diverted to its destination. Coarse impurities are retained in the layer of floating granules 2, and smaller ones with a filter element 5. During the filtration process, the solid phase is clogged with floating granules, in which it is distributed throughout its volume, since the size of the granules decreases along the liquid and on the surface filter element 5 forms a layer of a solid phase, which helps to retain the smallest fractions of the solid phase. As the accumulation of contaminants in the thickness of the floating granules 2 and the growth of the alluvial layer of the solid phase on the surface of the filter element 5 and the increase in hydraulic resistance, the liquid level in the installation increases to the maximum level Zmax, after which the installation is flushed. For this, the pipe 7 for draining the filtrate is closed, and the pipe 9 for draining the washing liquid and sediment is opened. In this case, the fluid flow discharged through the pipe 9 exceeds the fluid flow entering the housing! During the washing process, the loading volume, made in the form of floating granules 2, expands and the solid phase is removed from it. When expanding the loading volume, granules 2 perform reciprocating contact movements along the surface of the filter element 5, which contributes to the intensive removal of the alluvial layer from its surface solid phase, and its removal, bypassing the filter layer from granules 2, since the annular chamber is located under the load, while reducing the filter regeneration time. After washing, the pipe 9 opens to drain the filtrate, and the pipe 9 for draining the washing liquid and sediment closes and the cleaning of the liquid continues, etc. If necessary, it is possible to periodically supply purified water under pressure to the annular chamber 4 for backwashing of the filter element 5. The implementation of the filter element 5 from the filter cloth eliminates the abrasion of the granules and eliminates the reduction of their volume during operation, and also eliminates the colmatization of element 5 small particles of granules.

Thus, the use of the proposed filter for liquid purification allows to increase the filter performance due to the intensive regeneration of its filter elements, increase the dirt capacity and filtration area, which reduces the cost of cleaning the liquid and improves the quality of its cleaning.

Claims (1)

Claim A filter for cleaning liquids, comprising a housing, a layer of floating granular loading coarse cleaning inside it, an annular chamber attached to the outer wall of the housing with a filter element for fine cleaning and a nozzle for draining the filtrate, and an assembly system located in the lower part of the housing, which differs that, in order to increase productivity, the annular chamber is located below the loading layer and its filter element is made of filter cloth.