WASTEWATER TREATMENT DEVICE

Abstract

This utility model relates to equipment for closed-loop water circulation systems used at facilities located in areas with limited water resources. The device comprises a housing made of interconnected stands, squeezing rollers, and conveying rollers. The conveying rollers are heated, while the squeezing rollers are hollow and perforated. The upper group of rollers is positioned above the surface of the wastewater, while the lower group is partially immersed in the wastewater being treated at the point of contact between the conveying and squeezing rollers and a compressible elastic porous belt. The conveying rollers of the lower group are pivotally mounted on the lower stand at an equal distance from the vertical stand. The stand is designed as a rod positioned parallel to the level of the wastewater being treated. The conveying rollers of the lower group are each supported, as in the upper group of rollers, on squeezing rollers. The squeezing and conveying rollers of the upper group are mounted on a vertical stand.Inclined drainage channels are installed inside the hollow perforated squeezing rollers of the upper group. The technical result: increased efficiency in separating industrial wastewater from fat-containing emulsions. 2 figs.

Description

[0001] This utility model relates to equipment for closed water circulation systems used at facilities located in areas with limited water resources. This equipment allows for simultaneous solutions to water supply and environmental protection issues, for example, for food processing facilities, by separating waste liquids by density while increasing the concentration of fat-containing emulsions.

[0002] A device is known for impregnating rolled materials with a liquid, containing an impregnating bath, transport rollers and squeezing rollers installed in the bath after them, which deforms an elastic porous material, wherein the squeezing rollers are installed at the entrance of the material being impregnated, and the axes of the transport rollers lie in a plane parallel to the surface of the liquid [USSR A.s. No. 552212, IPC B29G 7 / 00, Device for impregnating rolled materials, BI, No. 12, 1977].

[0003] The existing device is more productive because it maximizes the pore space of the roll material used, but this is due to the fact that the axes of the squeezing rollers lie in the plane of the liquid surface. However, they can remove not only the light fraction but also the heavier ones. This leads to unnecessary costs for organizing another separation cycle for the already separated liquid fraction and also contributes to the development of turbulence at the interface and mixing of the phases, which complicates the separation process itself.

[0004] For circulating water supply, a device for separating liquids is used, which includes a bath, upper and lower pairs of squeezing and transport rollers, of which the upper transport roller is made hollow and perforated, with an elastic porous belt placed on them [Patent of the Russian Federation No. 2239485, IPC B01D 17 / 00, Device for separating liquids, 11 / 10 / 2004].

[0005] The advantages of this technical solution are realized by the fact that the conveying rollers are connected by a spring and positioned at the entrance to the bath so that one of them touches the surface of the bath, while the other is positioned within it. The centerline of the conveying and squeezing rollers forms a predetermined angle with the surface of the fat-containing liquid being separated. This allows, on the one hand, to maximize the pores and elastic properties of the material to remove the light fraction from the surface of the liquids being separated. On the other hand, the appropriate selection of belt thickness, spring elasticity coefficient, and elastic modulus of the material ensures the removal of a precisely defined layer of liquid without mixing it with the main mass.

[0006] The closest device to the claimed one is for purifying wastewater by separating fat-containing emulsions into fractions, including a bath body, upper and lower squeezing and transporting rollers, of which the upper transporting roller is made hollow and perforated, with an elastic porous belt placed on them, two squeezing rollers are supported on the upper transporting roller, which are pivotally attached to the bath body by means of racks, and these racks are connected to each other by a calibrated replaceable spring, and the squeezing roller, located on the side of the oncoming elastic porous belt, is made heated [Device for separating containing emulsions according to Russian patent for utility model No. 142481, IPC B01D 17 / 00, published 27.06.2014, BI No. 18]

[0007] The proposed device achieves its positive effect by employing two squeezing rollers supported by a perforated upper conveying roller. One of these rollers, located on the incoming side of the elastic porous belt, is heated, for example, by a heating element or direct steam. These rollers sequentially squeeze out the lighter fat-containing fraction collected from the surface of the elastic porous belt. When heated, the lighter fat-containing fraction becomes more fluid and is removed through a drainage chute located in the upper conveying roller.

[0008] The technical problem for which the claimed device for wastewater treatment is proposed is to increase the efficiency of separating industrial wastewater from fat-containing emulsions by more fully utilizing the properties of an elastic porous tape and ensuring its stable operation on the open surfaces of settling tanks.

[0009] To solve such a problem, a device for cleaning wastewater, including a housing made of interconnected racks, squeezing and transporting rollers, of which the transporting rollers are made heated, and the squeezing rollers are hollow and perforated, wherein the upper group of rollers is located above the surface of the wastewater being treated, and the lower group with partial immersion in the wastewater being treated at the point of contact of the transporting and squeezing rollers with a compressible elastic porous belt, wherein the transporting rollers of the lower group are pivotally fixed on the lower rack, made in the form of a rod placed parallel to the level of the wastewater being treated, at an equal distance from the vertical rack, each supported, as in the upper group of rollers, on the squeezing rollers, and the squeezing and transporting rollers of the upper group themselves are mounted on the vertical rack in such a way that the transporting rollers do not touch the surface of the wastewater being treated,At the same time, inclined drainage channels are installed inside the hollow perforated squeezing rollers of the upper group.

[0010] The essence of the technical solution is that the lower group of transport rollers, placed at an equal distance from the vertical post, ensure stable autonomous operation of the device due to their buoyancy in any section of a wastewater storage facility with a sufficiently large surface area of ​​useful water level. Their hinged attachment to the lower post, designed as a rod parallel to the level of the separated emulsion, allows the rollers to contact each other to compress the elastic porous belt directly at its entry into the separated liquid. The design of both pairs of lower group rollers (both squeezing and transporting) mounted on the vertical post along the contact line with the wastewater surface allows for more efficient use of the elastic properties of the porous material, collecting a larger quantity of fat or oil inclusions and squeezing air bubbles within the fabric through the perforations of the squeezing rollers.This increased amount of contaminants in the upper group of rollers is easily removed through inclined drainage channels installed inside the hollow perforated squeezing rollers of the upper group.

[0011] Fig. 1 shows a vertical section of the devices, Fig. 2 shows a cross-section of the squeezing rollers of the upper group with drainage channels, fixed on a vertical stand.

[0012] The proposed device contains hollow perforated squeezing rollers 1 of the lower group and heated transport rollers 2 of the lower group, installed in contact with each other along the line of contact with the surface of the wastewater being treated and the elastic porous belt 3. Rollers 2 are mounted pivotally on a rod perpendicular to the stand 6 of the housing made of stands connected to each other, on which heated transport rollers 5 of the upper group are fixedly fixed, resting on hollow perforated squeezing rollers 7 of the upper group, equipped with drain gutters 4.

[0013] The device operates as follows. A porous elastic belt 3 enters the roller area of ​​the lower group of squeezing roller 1 and conveying roller 2, where it is deformed under the action of a spring. When compressed, the air trapped within the individual pores is easily removed through the perforations of roller 1, as the belt surfaces are not subject to any additional stress.

[0014] As the belt moves through the surface layer of the wastewater being treated, its elastic properties begin to restore its geometric shape, absorbing the lightest fat-containing fraction. Having a strictly defined thickness, the belt acts only on a specific layer of liquid being removed, without mixing it with others. As it moves, coming into contact with the spring-loaded heated transport roller 5 and the perforated squeezing roller 7, the porous belt deforms again, freeing its pores from the fat-containing fraction collected from the wastewater surface. Its viscosity decreases as it heats, and this fraction flows down chute 4. The process then repeats on the symmetrical right side of the device, removing another batch of contaminants through a similar chute 4 of the upper group of heated transport roller 5 and perforated squeezing roller 7.

[0015] The double compression-unloading cycle of the porous belt 3 facilitates a more complete release of air bubbles from the belt structure, and the symmetrical placement of the transport rollers 2 expands the technological capabilities of the device, allowing it to operate autonomously in conditions of large surface areas of water settling tanks.

[0016] The use of the described device allows for the simple and accurate separation of individual fractions of liquids of varying density, while ensuring high productivity due to the appropriate selection of the temperature values ​​of the transport rollers and the compression force of the spring.

Claims

A device for purifying wastewater, comprising a housing made of interconnected stands, squeezing and transporting rollers, of which the transporting rollers are heated, and the squeezing rollers are hollow and perforated, characterized in that the upper group of rollers is located above the surface of the wastewater, and the lower group is partially immersed in the wastewater being purified at the point of contact of the transporting and squeezing rollers with a compressible elastic porous belt, wherein the transporting rollers of the lower group are pivotally attached to the lower stand, made in the form of a rod placed parallel to the level of the wastewater being purified, at an equal distance from the vertical stand, each supported, in the same way as in the upper group of rollers, on the squeezing rollers, and the squeezing and transporting rollers of the upper group themselves are mounted on a vertical stand, wherein inclined drainage channels are installed inside the hollow perforated squeezing rollers of the upper group.

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