RU51382U1 - SILF SQUARE - Google Patents

Abstract

The utility model relates to the field of wastewater treatment, namely, devices for dewatering wastewater sludge at wastewater treatment plants, for example at silt sites. The sludge platform contains a base, enclosing walls with windows in which slide devices are installed, a sludge supply pipeline and a collector of sludge water. The vertical slots are made in the gates, having a trapezoidal shape in cross section, with the smaller base of the trapezoid facing the silt area. The technical effect is to increase the efficiency of the sludge site by providing a continuous process for the removal of sludge water from various levels, including from the lower sediment layers, as well as simplifying the design and increasing the reliability of the drain device.

Description

The utility model relates to the field of wastewater treatment, namely, devices for dewatering wastewater sludge at wastewater treatment plants, for example, at silt sites.

A number of factors significantly affect sludge dewatering under natural conditions at silt sites:

- filtering properties of the drainage and the grounds;

- filtration properties of sediment;

- the thickness of the layer of poured sediment;

- timely layer-by-layer cleaning of dried sludge;

- equipped with equipment, mechanisms and devices for cleaning, loading, transporting and transporting sludge, and for the effective removal of sludge water.

There are various designs of silt sites, which is associated with specific conditions for their construction, operation and harvesting of dehydrated sludge. Currently, silt sites on a natural base with drainage and without drainage are used, on an asphalt concrete base, cascade silt platforms with sedimentation and surface removal of silt water, silt platforms with wells of various designs, compactors, etc.

Known sludge site, equipped with a drainage system with vertical filter elements and pipes for drainage of sludge water, see ed. USSR Academy of Sciences No. 1206233, class C 02 F 11/00, C 02 F 103/00, publ. 01/23/1986, the Drainage system is made in the form of sectional pipes branched along the surface of the site with a common pipe, having

seats with mesh bottoms in which vertical filter elements are installed, while the common pipe is connected to the pipe for drainage of silt water, sectional pipes have detachable connections and plugs for washing.

However, the cortical layer formed in the process of sludge dewatering leads to frequent siltation of the vertical filter elements, the washing of which is extremely difficult and requires the sludge pad to stop working.

Known sludge site with an asphalt concrete base and drainage trays, which are filled in the upper part with pebbles, and the lower part of the tray is blocked by a holey drainage plate with a thickness of 120 mm, supporting loading. An outlet drain pipe is provided at the end of the tray. To drain the silt water, trenches or ditches are arranged, which are filled with gravel or gravel. The outlet drainage pipe is located in a layer of gravel, which is covered with a layer of sand on top (see Sludge pads. General information and recommendations for design. Collection. M., Soyuzvodokanalproekt, 1970).

Such silt sites are inefficient and do not provide the necessary parameters for sludge dewatering and drying.

A well-known silt site containing a natural base with drainage and sediment outflows (see Yakovlev S.V., Karelin Y.A. et al. Sewerage, M., Stroyizdat, 1975, p. 292-294, Fig. 4.60).

The disadvantages of such a sludge site include the impossibility of discharging sludge water from any depth, since the thermophilic-fermented sediment exfoliates to form more dense upper and lower layers in depth and less dense - medium. In addition, when filling in the cards, the sediment is stratified, the bottom layer is compacted, its resistivity increases, the filtration rate first decreases, and then the filtration practically stops and the site works only on evaporation. Such silt sites cannot

drain and drain the sludge sludge water during the spring thaw period, since drainage, overflow pipes and the base are frozen and are in this state for a long time (this phenomenon is especially often observed at the treatment facilities in Siberia).

Common disadvantages of the described known technical solutions are the complexity, material consumption and frequency of operation due to the presence of a drainage system.

Sludge platforms equipped with devices for removing sludge water made in the form of wells are also known. So a sludge platform by bus. St. Wu No. 789438, class C 02 F 11/00, publ. 12/23.80, is a silt site with a natural base, equipped with gravel wells. Wells are placed along the silt map on the side opposite to the sediment outlets and are connected by asbestos-cement pipes. The walls of the wells are equipped with a double reinforcing mesh and gravel or crushed gravel placed between the grids. The disadvantage of this sludge site is the need for periodic cleaning of the outer walls of the wells from the film formed from the sediment and washing the filter filler walls.

A device for dewatering sludge sediment sludge pad protected by patent No. 33113 (class C 02 F 11/12, publ. 10.10.03) is made in the form of a tank having a bottom and side walls with slots of a trapezoidal shape. The tank is equipped with a pump and piping system for water drainage.

The disadvantages of this technical solution is the need to equip the sites with water ducts for drainage of sludge water, the need to provide power to each well and the presence of specially trained maintenance personnel. Such a device cannot work at temperatures below 0 ° C, and in Siberian conditions it is not only in the winter period of time, but also in the deep autumn and early spring due to constant night frosts.

Based on the foregoing, we can conclude that the proper effect of the sludge sites is achieved when their operation is properly organized, including when properly organized drainage of sludge water. Moreover, it is especially important and difficult to ensure the removal of sludge water from the bottom of the sludge site, along the entire height of the sludge filling.

In the practice of operating sludge sites, a slide-type drain device is widely used, which can be located in one of the walls (see, for example, “Facilities for the treatment of urban sewage sludge”, M., Stroyizdat, 1978, p. 33, Fig. 16) . However, such a drain device removes sludge water only from the surface layer of sludge, while layers and lenses of sludge water remain in the lower layers of the sludge. All this reduces the efficiency of the sludge site and the quality of sludge dewatering.

The prototype of the proposed utility model, according to the authors, is a silt site protected by the USSR copyright certificate No. 1305135, according to class. C 02 F 11/12, publ. 04/23/87. The sludge platform contains a waterproof base with enclosing walls, a pressure sludge pipe is connected to it, filtered water is discharged through the collector. Windows are made in the walls of the site and there are stepped slide gate devices in them, the opening of which is carried out using a screw mechanism. The platform is equipped with cassette-filtering vertical devices installed in the windows of the walls of the platform from the side opposite the gate devices, and the drainage system is made in the form of trays with filter loading located on the base of the platform, on which seats with vertical filters are installed.

A drain device in a sludge platform of this design is designed to drain the filtrate over the entire height of the sediment. However, such a drainage system is complex, its reliability is low, and installation costs

and operation are significant. After filling the site with sediment, exposure to compaction and separation of the sediment is necessary. The operation of the drain gate device is impossible without a cassette-filtering vertical device with a water seal mounted on the outside of the site. This design is difficult to manufacture and maintain. The need to fill the cavity of an open window with filtering material and its subsequent evacuation also complicates the operation of the sludge site.

All this, taking into account the frequency of work, reduces the efficiency of the sludge site, especially in sewage treatment plants of high power.

The objective of the proposed utility model is to increase the efficiency of the sludge site by providing a process for the continuous removal of sludge water from various levels, including from the lower sediment layers, as well as simplifying the design and increasing the reliability of the drain device.

To achieve the specified technical result in a sludge platform containing a base, enclosing walls with windows in which a slide device, a sludge supply pipe and a collector of sludge water are installed, vertical slots are made in the gates, having a trapezoidal shape in cross section, with a smaller trapezoid base facing the silt site.

The execution of slots in the gates provides a continuous drainage of sludge water by gravity from any depth, even when the gate position is at the window level. Such a drain device removes sludge water both from the upper level of the sludge pad and from under the crust formed on the surface of the sludge, as well as from the lower layers of the sludge, where interlayers and lenses of sludge water constantly form. This eliminates the need for installation of additional filtering devices. The proposed form of making slots significantly reduces

the number of cases of their clogging and provides the ability to clean the slots from small debris falling on the sludge site. Cleaning can be carried out during operation, it is carried out in any known manner, for example, using an elementary device with a hook. All this greatly simplifies the design of the drain device, increases the efficiency of the sludge site and improves the quality of treatment of sludge water.

Figure 1 shows two silt sites, a plan; figure 2 - step gate devices, an inside view of the sludge pad; figure 3 is a section aa of figure 2.

Each of the sludge pads 1 contains a base 2 with enclosing walls 3, in which windows 4 are made and slide devices 5 installed in the guides 6 are placed. The height of the windows is determined from the condition of maximum removal of the settled liquid layer. The vertical slots 7 are made in the gates, having a trapezoidal shape in cross section, with the smaller base of the trapezoid facing the silt area. The opening of the slide devices 5 is carried out using screw mechanisms 8. The platforms 1 are equipped with a pressure pipe 9 for supplying sludge, a tray 10 and a collecting collector 11 for draining sludge water. The number of slots in the gates and their sizes are determined depending on the composition and humidity of the treated sludge (sewage sludge, excess activated sludge or mixtures thereof).

Sludge site works as follows.

Before filling the sludge pad, the gate devices are closed. After that, the site is filled with sediment. At different levels of sludge, layers of sludge water are formed, which, through the slots 7, first of the lower and then subsequent gates, begins to flow into the tray 10 and then into the collection collector 11. The sludge is removed continuously. Moreover, all gates can remain closed all the time.

the operation of the sludge site, providing water drainage through the slots along the entire height of the sediment, regardless of the height of the level of filling the site. If necessary, including to accelerate the removal of the surface layer of sludge water, located at the level of the window 4, using screw devices 8, you can lift each of the gates 7.

Thus, the use of the proposed technical solution allows to increase the efficiency of the sludge site by providing a process of continuous removal of sludge water from various levels, including from the lower sediment layers. The design of the drain device of such a sludge platform is simple, reliable, convenient in operation, and provides, in comparison with the prototype, a reduction in capital costs.

The greatest effect can be obtained during the operation of the proposed sludge site with sewage sludge into which a water-soluble flocculant is introduced before being fed to the site. In this case, sludge flocculation occurs already in the pressure head sludge, providing intensive dewatering and it is very important from the very beginning to ensure continuous removal of sludge water from the lower level of the site and further along the entire height of the sludge.

The device is effective when working with various types of precipitation: fermented or non-fermented sewage sludge from domestic or industrial wastewater, excess activated sludge, mixtures thereof in any ratio and at any humidity.

The experience of operation of sludge sites for reagent dewatering of sediments with the proposed slide drain device with slots allows us to conclude that sludge water can be removed even at low temperatures, because The sludge coming in for dewatering has a positive temperature, which ensures constant movement of sludge water from the place of filling to the gates.

Depending on the operating conditions of the sludge site (filling height, filling ratio, etc.), it is possible to obtain a cake with a residual

humidity 70-80% with a purity of sludge water of 0.1-0.3 g / l, which is comparable with the humidity of the cake and the purity of the centrate obtained by mechanical dewatering of sediments on filter presses or centrifugal machines. Obtaining cake of specified moisture content on the proposed sludge site in a short period of time (2-6 months) allows you to save significant funds on cleaning sludge cards and transporting cake.

Claims (1)

A sludge platform containing a base, enclosing walls with windows in which sliders are installed, a sludge supply pipe and a collector of sludge water, characterized in that the slots are made of vertical slots having a trapezoidal shape in cross section, with the smaller trapezoid base facing towards silt site.