SU936963A1 - Method of regenerating granular charge of pressure filters - Google Patents

Description

(54) METHOD FOR REGULATING GRANULAR LOADING OF PRESSURE FILTERS

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The invention relates to the purification of natural and aftertreatment of industrial and wastewater and can be used mainly in water purification technology on pressure filters.

A known method of washing the granular load of pressure filters, including the separation of retained soils from the load grains and their removal when the load is weighed in an upward flow of water 1.

The disadvantage of this method is the high consumption of wash water, which is caused by the need to create such an intensity of collision between the loading grains, which would ensure that the adhering contaminants are completely rubbed off from their surface.

In addition, the method in |) de cases, for example, with water deferrization and water softening 11: by shinging, is characterized by insufficient reliability and efficiency. This is due to the fact that in NNB1X filters the movement of the treated water is carried out upwards, as a result of which the bulk of contaminants is trapped on the surface of the charge and in its upper layer.

As a result, by the end of the filter cycle, the top loading layer with the retained soils is as if cemented. With

 flushing the load with an upward flow in. At the first moment, the download is somewhat elevated. Then, water breaks through the upper cemented layer and water from the entire area of the filter rushes to the breakthrough site at high speeds, entraining the loading grains, which are partially discharged into the sewer. The latter circumstance leads to the complication of the filter operation, as well as, as noted, to the insufficient reliability and efficiency of the method.

There is a known method of washing the granular load of pressure filters, which includes loosening the load by sparging it with compressed air followed by

20 by removing the contaminants that are separated during the bubbling with the upflow of water.

Claims (3)

The method makes it possible to both reduce the consumption of wash water and increase the reliability and efficiency of washing. This is achieved by the fact that, when bubbling with the compressed air through the entire thickness of the load, it is loosened. When air bubbles move through the pore space, the contaminant loadings are not only scrubbed from the grains, but also dispersed, which makes it easier for them to be removed by an upward flow of water from filter 2. The disadvantage of this method is the complexity of its instrumentation, which is primarily due to , the need for a device in the filter of two distribution systems: for supplying wash water and supplying compressed air. Closest to the present invention is a method of washing a granular load of pressure filters, including loosening the load, followed by separating and removing contaminants when filling the load in an upward flow of water. At the same time, the load is loosened by lowering the water level in the filter below the top loading layer and then displacing the air from the load by the upward flow of water supplied at 40-bO / o intensity of the intensity necessary for weighing load 3. In spite of sufficient simplicity and reliability is characterized by increased duration. This is due to the fact that only lowering the water level in the filter, the loading of which is silted up. below the top loading layer, the time is between 8 and 12 minutes. The purpose of the invention is to reduce the duration of the process. This goal is achieved by the fact that, according to the method of regenerating granular loading of pressure filters, including loosening the top loading layer and subsequent loading and removing contaminants by the upward flow of wash water, loosening is carried out by creating a vacuum over the loading layer, no less b-Yu Pa. The drawing shows a pressure filter for implementing the method, a general view. The filter consists of a housing 1, inside which on a false bottom 2 lies a layer of granular load 2. The drainage distribution system is made of caps 4 installed on a false bottom 2. Above loading 3 there is a funnel 5 through which the treated water is fed to the filter and the wash is discharged. The filter has a pipeline 6 which is connected via a receiver with a vacuum pump, a pipeline 7 for draining the filtrate, a pipeline 8 for supplying water to the washing. The regeneration method is carried out in the following manner. Close the valve on the pipe 7 and through the funnel 5 discharged that part of the water, which is located above the funnel. Close the valve on the pipeline that drains water from the funnel 5; and open the valve on the pipeline 6, thereby reducing the pressure in the supercharging space of the filter below atmospheric. Gases dissolved in water, while vigorously emit, loosening the load. When the pressure in the overload space of the filter decreases to a value of 10–10 Pa, an intensive loosening of the load takes place in 1–2 minutes. With a pressure value exceeding 8 10 Pa, the time required for loosening the load is significantly increased. On the contrary, with a pressure in the upper loading space of the filter below 6-10 Pa, the time for the loading to open up can be somewhat reduced. However, this is due to the complexity of the instrumentation of the method. For example, with the need to increase the volume of the receiver or the use of more powerful vacuum pumps, which increases the cost of the method. The valve is closed in the pipeline 6 and opened in the pipeline 8 and the pipeline draining the wash water from the funnel 5. The rubbed out of the grains during loosening of the contamination load through the funnel 5 with the wash water flow is drained. In view of the fact that the flow rate of the washing water ensures load weighing, the washing efficiency is rather high, and the residual contaminants in the load after washing do not exceed 0.01% of the load weight. The proposed method allows to reduce the duration of the process compared to the known 4-5 times. Claims The method of regenerating granular loading of pressure filters, including loosening the top loading layer and then weighing the load, and removing contaminants by the upward flow of wash water, characterized in that, in order to shorten the process, loosening is not created by loading less than 10 Pa. Sources of information taken into account in the examination 1. V. Klko, A. Apeltsin. Purification of natural waters. M., Publishing house of literature on construction, 1971, p. 234-237,241. 2. Kastalsky A. A. Mints D. M. Preparation for drinking and industrial water supply. M., “Higher School, 962, p. 278-291. 3. USSR author's certificate No. 738636, cl. On 01 D 23/24, 01/06/78 (prototype). ixta