SU891576A1 - Device for slime dehydrating - Google Patents

Description

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The invention relates to devices for dewatering sludge from sewage from urban sewage networks and concentration plants and can be applied to the sludge and sludge disposal sites of sewage treatment plants.

A device for dewatering sludge is known, comprising a float body with a filter element disposed in a settling tank, a vacuum pump with an adjustable relief valve, connected by a vacuum wire to the float body.

The disadvantages of this device are the need to periodically remove the filter element from the tank for cleaning and rinsing, as well as its limited area.

The purpose of the invention is to increase the efficiency of use due to the intensification of the dewatering process and the backwashing of the filter element at the same time from the inside and outside during operation.

The goal is achieved by the fact that the filtering element is designed as a series of horizontal needle filters located in the lower part of the float body, and its upper part is connected by a pipeline to the grid with a vacuum line.

The drawing shows the proposed 10 device.

The device contains a floating body 1 placed in a settling tank with a filtering element 2 made in the form of a series of horizontal

15 needle filters located in the lower part of the housing 1 and connected by means of a vacuum wire 3 and a flexible pipe to the vacuum pump 5, and the upper part of the housing 1 is connected

20 by pipe 6 through the grid 7 with vacuum wire 3.

In the suction line of the vacuum source is set to regulate3

The discharge valve 8 is intermittently providing free air access to the suction system of the device.

The device works as follows.

The device is lowered into a natural sump and include a vacuum pump 5, initially pumping air out of the housing 1, and then liquid through the filtering element 2, made in the form of horizontal needle filters located in the lower part of the housing 1. Since the upper part of the housing 1 is through pipe 6 through the grid 7 is connected to the vacuum wire 3, the air is also pumped out from the upper part of the housing 1 and it is completely filled with liquid. When the device is operating, the needle filters of the filter element 2 gradually become clogged and the vacuum in the suction system increases. When a certain vacuum value is reached (set in advance), the valve 8 is activated and connects the suction line with the atmosphere and simultaneously the liquid is discharged through the needle filters from the inside and the liquid column from the top of the tank. Consequently, the washing of the filter elements with a stream of liquid occurs simultaneously from the inside and the outside, after which the valve 8 automatically returns to its original position and the process repeats.

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Thus, the proposed device provides an intensification of the decontamination process by increasing the area of the filter element of the element 5 and carrying out the backwashing of the filter element from the inside and out at the same time (and during its operation.

Claims (1)

Invention Formula A device for dewatering sludge, containing placed in a settling tank tank float housing with a filter element, a vacuum pump with an adjustable relief valve connected by a vacuum wire to the float housing, characterized by the fact that, in order to increase the efficiency of use due to the intensification of dewatering and to provide backwashing of the filter element, in the form of a series of horizontal needle filters installed in the lower part of the body of the float and the device is equipped with a pipeline with a grid attached at one end to the vacuum wire, and others - to the upper part of the body of the float. Sources of information taken into account in the examination 1. USSR Author's Certificate No. i | 45622, cl. C 02 C 3/00, 1971. Air