CN106830594B

CN106830594B - Sludge treatment system

Info

Publication number: CN106830594B
Application number: CN201710196795.1A
Authority: CN
Inventors: 王冰; 朱黎巍; 王京南; 姜鸣
Original assignee: Yixing Huaduhupo Environmental Protection Machinery Manufacturing Co ltd
Current assignee: Yixing Huaduhupo Environmental Protection Machinery Manufacturing Co ltd
Priority date: 2017-03-29
Filing date: 2017-03-29
Publication date: 2023-10-20
Anticipated expiration: 2037-03-29
Also published as: CN106830594A

Abstract

The application discloses a sludge treatment system. The system comprises: a first screening device; the first screening device can separate coarse materials with the particle size larger than a first preset value from the sludge and output the rest part from the first outlet; a second screening device; the second screening device can separate fine sand with the grain size larger than a second preset value from the input material and output the rest part from a second outlet; a grille filter; the grid filter device can separate organic matters in the input materials and output the rest part from the third outlet; a separation device; the separating device is used for separating out the sediment with the grain diameter larger than a third preset value from the materials output by the third outlet, and then the sediment is filled or used according to the self properties of the separated out various materials, so that the problem of environmental pollution caused by directly filling the sludge without treatment in the prior art is avoided, and meanwhile, the utilization rate of the sludge is also improved.

Description

Sludge treatment system

Technical Field

The application relates to the field of environmental protection equipment, in particular to a sludge treatment system.

Background

The drain pipe network can deposit sludge in the drain pipe in the long-term use process. If the sludge in the drain pipe is not timely eliminated, the drain pipe may be unsmooth in drainage, and water accumulation or sewage overflow is caused, and waterlogging phenomenon can be generated sometimes. The sludge deposited in the pipeline can also enter the river channel along with rainwater in rainy days, so that the water body in the river channel is polluted. In order to ensure the normal operation of the drain pipe network, the sludge in the drain pipe needs to be cleaned regularly.

At present, sludge cleaned from a drain pipe is usually treated by a single landfill or a mixed landfill. But the water content of the untreated sludge is not equal to 50% to 80%, and the pH value is also between 7.1 and 8.5. If the landfill is directly carried out without treatment, not only the admittance conditions of the landfill site cannot be met, but also the pollutants such as organic matters, pathogens, percolate and the like in the sludge can cause secondary pollution, thereby bringing serious environmental problems.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, a system is needed to treat the sludge before it is landfilled, so as to meet the requirement of landfilling, and also avoid secondary pollution caused by organic matters, pathogens, leachate and other pollutants in the sludge.

In view of the above problems, an object of the present application is to provide a sludge treatment system for solving the above problems.

In order to achieve the above object, the present application provides a sludge treatment system comprising:

a first screening device; the first screening device comprises a first inlet and a first outlet, the first inlet is used for inputting sludge, the first screening device can separate coarse materials with the particle size larger than a first preset value from the sludge, and the rest part of the coarse materials are output from the first outlet;

a second screening device; the second screening device comprises a second inlet and a second outlet, wherein the second inlet is used for inputting the output of the first outlet; the second screening device can separate fine sand with the grain size larger than a second preset value from the input material and output the rest part from the second outlet;

a grille filter; the grid filter device comprises a third inlet and a third outlet, the third inlet is used for inputting the output of the second outlet, and the grid filter device can separate organic matters in the input materials and output the rest part of the organic matters from the third outlet;

a separation device; the separation device is used for separating out sediment with the grain size larger than a third preset value from the materials output by the third outlet.

In an alternative embodiment, the first preset value is 15 mm; the second preset value is 0.2 mm; the third preset value is 0.05 millimeter; the filtering range of the grid filtering device is 3 mm-15 mm.

In an alternative embodiment, the second screening device includes a sand washer; the sand washer can separate out fine sand with the grain diameter of more than 0.2 mm by utilizing the wall attaching effect.

In an alternative embodiment, the sand washer comprises a conical container, an input mechanism arranged at the upper part of the conical container, a stirring mechanism positioned in the conical container, a water delivery mechanism positioned at the lower part of the conical container and a sand delivery mechanism connected with the bottom of the conical container;

the input mechanism is used for inputting the substance output by the first outlet; the water delivery mechanism is used for delivering water upwards so as to separate organic matters from fine sand; the sand conveying mechanism is used for discharging fine sand separated by the sand washer.

In an alternative embodiment, the sand conveying mechanism comprises a first shell and a first screw rod positioned in the shell; the first screw rod is obliquely arranged relative to the horizontal plane; the sand conveying mechanism is provided with a first output end and a first input end; the first output end is higher than the first input end; the first input end is communicated with the bottom of the conical container; and a water outlet is also arranged below the first input end.

In an alternative embodiment, the upper part of the conical container is provided with a drain pipe communicated with the grid filtering device; the liquid in the conical container can enter the grid filter device through the liquid discharge pipe by means of gravity.

In an alternative embodiment, the grid filtration device is a drum grid or an internal inlet flow type mesh plate grid.

In an alternative embodiment, the separation device is a cyclone separator; and the cyclone separator separates out sediment with the grain diameter larger than the third preset value through centrifugal force.

In an alternative embodiment, the cyclone separator comprises a conical shell, a feed inlet arranged at the upper part of the conical shell, a sand outlet arranged at the bottom of the conical shell, and an overflow port arranged at the top of the conical shell; the feeding direction of the feeding hole is the tangential direction of the cross section outline of the conical shell.

In an alternative embodiment, the feed inlet of the cyclone separator is communicated with a booster pump; the booster pump is capable of inputting the material discharged from the third outlet to the cyclone separator.

In an alternative embodiment, the sand outlet is communicated with a sand-water separator; the sand-water separator comprises a second shell and a second screw rod positioned in the second shell; the second screw rod is obliquely arranged relative to the horizontal plane; the sand-water separator is provided with a second output end and a second input end; the second output end is higher than the second input end; the second input end is communicated with the bottom of the conical container; a water outlet is arranged below the second input end.

In an alternative embodiment, the third outlet of the grille filter device is communicated with the first tank; the booster pump is arranged at the bottom of the first tank body.

In an alternative embodiment, the method further comprises:

a pretreatment device for treating sewage in the sludge; the pretreatment device comprises a second tank body and a grid arranged on the second tank body; the second tank body conveys the pretreated sewage to the first inlet through a conveying pump;

the grids comprise a first grid arranged at the top of the second tank body and a second grid positioned below the first grid; the grid holes of the first grid are larger than the grid holes of the second grid.

In an alternative embodiment, the method further comprises: a third tank for storing the mud in the sludge and a conveying device; the conveying device can convey the muddy matter in the third tank body to the first inlet.

In an alternative embodiment, a deodorizing device is also included.

The sludge treatment system can continuously treat sludge, different devices in the sludge treatment system can separate materials with different particle diameters and different components from the sludge in sequence, and the materials are filled or used according to the properties of the separated materials, so that the problem of environmental pollution caused by direct filling of the sludge without treatment in the prior art is avoided, and the utilization rate of the sludge is improved.

Specific embodiments of the application are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the application are not limited in scope thereby. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a sludge treatment system provided by an embodiment of the present application;

fig. 2 is a schematic structural view of a sand washer of the sludge treatment system according to the embodiment of the present application;

fig. 3 is a schematic structural view of a cyclone separator of a sludge treatment system according to an embodiment of the present application.

The following drawings illustrate:

1. a first screening device, 11, a first inlet; 12. a first outlet; 2. a second screening device; 21. a second inlet; 22. a second outlet; 23. a sand washer; 231. a conical container; 232. an input mechanism; 233. a stirring mechanism; 234. a water delivery mechanism; 235. a sand conveying mechanism; 236. a first housing; 237. a first screw; 238. a liquid discharge pipe; 3. a grille filter; 31. a third inlet; 32. a third outlet; 4. a separation device; 41. a cyclone separator; 411. a conical housing; 412. a feed inlet; 413. a sand outlet; 414. an overflow port; 415. a sand-water separator; 416. a second housing; 417. a second screw; 5. a pressurizing pump; 6. a first tank body; 7. a second cell body; 8. a third tank body; 9. and a conveying device.

Detailed Description

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and the specific embodiments, it should be understood that these embodiments are only for illustrating the present application and not for limiting the scope of the present application, and various modifications of equivalent forms of the present application will fall within the scope of the appended claims after reading the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present application provides a sludge treatment system, which may include: a first screening device 1; the first screening device 1 comprises a first inlet 11 and a first outlet 12, the first inlet 11 is used for inputting sludge, the first screening device 1 can separate coarse materials with the particle size larger than a first preset value from the sludge and output the rest part from the first outlet 12; a second screening device 2; the second screening device 2 comprises a second inlet 21 and a second outlet 22, the second inlet 21 being for inputting the output of the first outlet 12; the second screening device 2 can separate fine sand with the grain size larger than a second preset value from the input material and output the rest part from the second outlet 22; a grille filter 3; the grid filter device 3 comprises a third inlet 31 and a third outlet 32, the third inlet 31 is used for inputting the output of the second outlet 22, the grid filter device 3 can separate organic matters in the input materials and output the rest part from the third outlet 32; a separation device 4; the separating device 4 is used for separating out sediment with the grain size larger than a third preset value from the material output by the third outlet 32.

By means of the technical scheme, the sludge treatment system can continuously treat sludge, different devices in the sludge treatment system can separate materials with different particle sizes and different components from the sludge in sequence, the materials are separated out to be buried or used according to the properties of the materials, and therefore the problem of environmental pollution caused by direct landfill of the sludge in the prior art without treatment is avoided, and meanwhile, the utilization rate of the sludge is also improved.

In the present embodiment, the first screening device 1 may be a screening machine. The screening machine can screen coarse materials with the grain size larger than a first preset value in the sludge by utilizing actions such as rotation, vibration, reciprocation, shaking and the like. For example, the screening machine may be a vibrating screen provided with a filter screen, wherein the diameter of the mesh of the filter screen may be smaller than a first preset value, such that material having a particle size greater than the first preset value may be blocked at the surface of the filter screen, and material having a particle size smaller than the first preset value may pass through the filter screen, such that the screening machine is capable of separating coarse material from sludge; for another example, the screening machine may be a screw screen, a drum screen, or the like. Therefore, the present application is not particularly limited in the structure of the first screening device 1, as long as it can separate coarse materials having a particle size larger than the first preset value from sludge, which is all in accordance with the requirements of the present application.

Wherein the first preset value may be 15 mm. In practice, the material having a particle size of 15 mm is typically stone or crushed brick. After the first screening device 1 separates out the particles, the particles can be specially treated or used, and meanwhile, the larger stones or broken bricks are prevented from damaging the subsequent screening devices, so that the subsequent screening devices are effectively protected. Of course, the first preset value may be greater than 15 mm or slightly less than 15 mm, for example, the range of the first preset value is 15 mm±5 mm, 17 mm±5 mm or 14 mm±5 mm, and the operator may select according to the actual use requirement.

In this embodiment, the first inlet 11 of the first screening device 1 may be used for receiving an input of sludge. Specifically, the sludge may be fed into the first screening device 1 through a first inlet 11 via a transfer device 9 such as a pipe or a grab. The shape of the first inlet 11 may be various. For example, the first inlet 11 may be an opening directly formed in the housing of the first screening device 1, the area and shape of which may be determined according to the actual use requirements, or an open piece or a delivery tube provided on the first screening device 1; alternatively, the first inlet 11 may not be a solid structure, for example, the first inlet 11 may be an open area above the screen, and the area may be the first inlet 11.

The first inlet 11 may be located at an upper portion of the first screening device 1, and after the sludge enters the first screening device 1 through the first inlet 11, coarse materials with a particle size larger than a first preset value in the sludge are separated by the first screening device 1, and the rest materials fall into a lower portion of the first screening device 1. Of course, the first inlet 11 may also be arranged at other locations of the first screening device 1, such as in the middle or in the lower part. The present application is not limited in particular to the structure and the location of the first inlet 11, and meets the requirements of the present application as long as it is sufficient for the sludge to be fed into the first screening apparatus 1.

The first screening device 1 may also be provided with a first outlet 12. The first outlet 12 may output the material remaining after the first screening device 1 screens the sludge. Wherein the outgoing material can be fed into the second screening device 2 by means of a pipe or a transfer device for transport. The shape of the first outlet 12 may also be various, for example, the first outlet 12 may be an opening directly opened on the housing of the first screening device 1, and the shape and area of the opening may be determined according to actual use requirements; alternatively, the first outlet 12 may be formed as an open piece or a row of pipes arranged on the first screening device 1, or the first outlet 12 may not be of solid construction, e.g. the first outlet 12 may be an open area directly below the screen, which whole area may be referred to as the first outlet 12.

In addition to the various embodiments of the shape of the first outlet 12, the first outlet 12 may be disposed at various positions, for example, the first outlet 12 may be disposed at a lower portion of the first screening device 1, and the material screened by the first screening device 1 is discharged to a lower portion of the first screening device 1 under the action of gravity and then discharged from the first outlet 12, and of course, the first outlet 12 may also be disposed at a middle portion of the first screening device 1. The structure and the arrangement position of the first outlet 12 are not particularly limited in the present application, and the present application is not limited as long as the remaining portion after the sludge is screened can be discharged.

In this embodiment, the second screening device 2 may be in material communication with the first screening device 1. The second screening means 2 may in turn further process the material output by the first screening means 1. Specifically, the second screening device 2 is capable of separating out fine sand having a particle size greater than a second predetermined value from the incoming material and outputting the remaining portion from the second outlet 22.

The second screening device 2 may be communicated with the first screening device 1 in various manners, for example, the first screening device 1 and the second screening device 2 may be communicated through a pipeline. A conduit may be provided between the first outlet 12 and the second inlet 21, one end of the conduit communicating with the first outlet 12 and the other end of the conduit communicating with the second inlet 21. The material discharged from the first outlet 12 may then be conveyed to the second screening device 2 by means of a pipe conveyance; for another example, the first screening device 1 and the second screening device 2 may not be in communication through any physical structure, and the material discharged from the first outlet 12 of the first screening device 1 may be collected in a hopper, and the hopper may then convey the material to the position of the second inlet 21 of the second screening device 2, and then input into the second screening device 2 through the second inlet 21;

in addition, the second screening device 2 may also be arranged close to the first screening device 1 and the second screening device 2 may be located below the first screening device 1. The first outlet 12 is opposite to the second inlet 21, and the material output by the first outlet 12 can directly fall into the second inlet 21, so that the material is transported.

Of course, the present application is not limited in particular to the manner of communication and the relative positions of the first screening means 1 and the second screening means 2, and it is not limited to the manner in which the material output from the first outlet 12 may enter the second screening means 2 through the second inlet 21, as long as it meets the requirements of the present application.

Wherein the second preset value may be 0.2 mm. Of course, the second preset value can be between 0.2 mm and 15 mm, and the user can determine according to the actual use requirement. The sand particles in the particle size range can be generally recycled as low-grade building materials, so that the utilization rate of sludge can be improved, and the amount of the sludge to be buried is reduced.

In this embodiment, the second screening device 2 may comprise a sand washer 23. The sand washer 23 can separate out fine sand having a particle size of more than 0.2 mm by using the coanda effect. Specifically, referring to fig. 2, the sand washer 23 may include a conical container 231, an input mechanism 232 provided at an upper portion of the conical container 231, a stirring mechanism 233 provided in the conical container 231, a water delivery mechanism 234 provided at a lower portion of the conical container 231, and a sand delivery mechanism 235 connected to a bottom portion of the conical container 231.

Wherein the conical container 231 may be a housing having a generally conical chamber formed therein. The housing may be of a metallic material, such as stainless steel, aluminum alloy, or the like. The housing may also be of a non-metallic material, such as plastic. The conical container 231 may be disposed in a longitudinal direction. The diameter of the upper portion of the conical container 231 may be larger than the diameter of the lower portion thereof, so that the material entering the conical container 231 may continuously move in a decelerating manner from top to bottom, and further fine sand is deposited in the space of the lower portion, thereby facilitating collection. In addition, the taper of the tapered container 231 and the volume of the container may be determined according to actual use requirements, and the present application is not limited thereto.

The input mechanism 232 may be disposed at an upper portion of the conical container 231. In particular, the upper portion of the conical container 231 may be provided with a top cover. The input mechanism 232 may be provided on the top cover, and one end of the input mechanism 232 may extend into the chamber of the conical container 231, the other end of the input mechanism 232 may be in communication with the second inlet 21, or the second inlet 21 may be formed directly on the other end of the input mechanism 232, so that the material output from the first outlet 12 may enter the conical container 231. Preferably, the input mechanism 232 may be a conduit, and the end of the conduit extending into the chamber of the conical container 231 may be flared in shape. The flare is configured to provide a relatively high velocity of material entering the conical vessel 231 and to direct the material toward the side walls of the conical vessel 231 such that fine sand within the material contacts the side walls and moves down the side walls and accumulates at the bottom of the conical vessel 231. The other end of the conduit may be in communication with the second inlet 21 so that material from the first outlet 12 may be fed into the conical container 231.

The stirring mechanism 233 may be disposed within the conical container 231. The stirring mechanism 233 may include a motor and stirring members (stirring blades) rotatably connected to the motor. The motor drives the stirring member to stir the material in the conical container 231. Wherein the material in the conical container 231 is typically a sand-water mixture. The sand-water mixture is rotated at a low speed in the conical container 231 under the driving of the stirring member. When there is surface friction (also known as fluid viscosity) between the sand-water mixture and the surface of the object through which it flows, the fluid will flow along the surface of the object (coanda effect) as long as the curvature is not large. Relatively low density materials (water, scum and suspended solids) will move upwardly along the side walls and relatively high density materials (fine sand) will move downwardly along the side walls under their own weight and deposit onto the bottom of the conical container 231, thereby effecting separation of the fine sand from the material.

The water delivery mechanism 234 may also be disposed at a lower portion of the conical container 231. The water outlet end of the water delivery mechanism 234 is disposed at the bottom of the conical container 231 and within the conical container 231. The water inlet end of the water delivery mechanism 234 may be connected to an external water source. When a certain amount of fine sand is deposited at the bottom of the conical container 231, the water delivery mechanism 234 may deliver pressurized water into the conical container 231, and the water flow direction may be upward. The pressurized water entering the conical vessel 231 may in turn agitate the fine sand, thereby forming a fluidized sand bed at the location where the fine sand is deposited. The fine sand in the fluidized sand bed moves continuously and generates friction or impact with each other, so that organic matters adhered to the surface of the fine sand can be removed.

A sand conveyance mechanism 235 may be provided at a lower portion of the conical container 231 for discharging fine sand from which organic matter is removed from the conical container 231. Specifically, sand conveyance mechanism 235 may include a first housing 236 and a first screw 237 located within the housing. The first housing 236 may be a sleeve extending in a longitudinal direction, and one end of the sleeve communicates with a lower portion of the tapered container 231. The first screw 237 may be sleeved within the first sleeve. Sand feed mechanism 235 has a first output and a first input. The first input may be an end of the first housing 236 that communicates with the conical container 231. Fine sand located at the bottom of the conical vessel 231 may enter the first housing 236 through the first input end. One end of the first screw 237 is also located on the first input end, and the other end of the first screw 237 is located on the first output end, so that the first screw 237 can convey fine sand to the first output end and discharge the fine sand out of the collection mechanism.

Preferably, in order to make the moisture content of the fine sand discharged from the sand conveying mechanism 235 lower, the first screw 237 is inclined with respect to the horizontal plane, and the first output end is higher than the first input end, so that the water in the fine sand can be discharged along the direction opposite to the movement direction of the first screw 237 under the action of gravity in the process of being conveyed by the first screw 237, and correspondingly, a water outlet is arranged below the first input end, so that the water discharged from the fine sand can be discharged from the water outlet, and the position of the water outlet is lower, thereby avoiding that the water remains in the sand conveying mechanism 235.

In this embodiment, the second screening device 2 is substantially liquid in the remainder of the fine sand having a particle size greater than the second predetermined value after separation. The liquid also contains a large amount of organic matters and sand bodies with smaller particle sizes, and further needs subsequent devices for treatment. The upper part of the conical container 231 is provided with a drain pipe 238 communicated with the grating filter device 3, and the liquid in the conical container 231 can enter the grating filter device 3 through the drain pipe 238 by gravity. Wherein one end of the drain 238 may be disposed on a side wall of the conical container 231 near the top of the conical container 231. The other end of the drain 238 may be in communication with the second outlet 22 or the second outlet 22 may be formed directly on the drain 238. The grid filter device 3 may be located below the drain 238, or the second outlet 22 may be located above the third inlet 31, such that the liquid in the conical container 231 enters the grid filter device 3 by gravity.

In the present embodiment, the grill filter 3 may include a third inlet 31 and a third outlet 32. The third inlet 31 is used for inputting the material output from the second outlet 22, and the grid filter device 3 can separate the scum and suspended matters in the input material and output the rest part from the third outlet 32.

In particular, the grating filter device 3 may be a drum grating or an internal inlet flow type mesh plate grating. The filtering range of the grating filtering device 3 is 3 mm to 15 mm, namely organic matters with the diameter of 3 mm to 15 mm in the materials and filter residues are separated, wherein the connection mode between the rotary drum grating or the inner inflow type screen plate grating and the second screening device 2 can be various, for example, the rotary drum grating or the inner inflow type screen plate grating can be arranged in a water channel, the materials output by the second outlet 22 can be firstly input into the water channel, and then the grating filtering device 3 processes liquid in the water channel; alternatively, the second outlet 22 may be in direct communication with the third inlet 31, and the drum grid or the inner inlet flow type mesh plate grid may further filter the liquid output from the second outlet 22, thereby separating organic matters from the liquid.

Wherein, organic matters can include dross and suspended matters, septage, fallen leaves, rhizomes of plants and the like, if the organic matters are not separated from the sludge, the sludge can cause stratum pollution at the landfill site when being buried, and meanwhile, after being separated, the organic matters can be transported to an incineration power plant for incineration power generation, thereby avoiding pollution and improving the utilization rate of resources.

Of course, the grating filter device 3 can separate inorganic matters in the range besides organic matters between 3 mm and 15 mm. For example, the filter residue separated by the grating filter device 3 generally contains 30% to 40% of organic matters, and the rest is inorganic matters, but the main function of the grating filter device 3 is to separate the organic matters, and whether the inorganic matters exist in the filtered matters is not limited in this embodiment.

In this embodiment, after the organic matters in the liquid are separated by the grid filtering device 3, the remaining material (liquid) can be conveyed into the separating device 4 through the third outlet 32, and the separating device 4 can separate out the sediment with the particle size larger than the third preset value from the material output by the third outlet 32.

The connection between the separation device 4 and the grid filtration device 3 may be various, for example, the separation device 4 and the grid filtration device 3 may be directly connected through a pipeline, that is, the material may directly enter the separation device 4 after being output from the third outlet 32 of the organic matter; the separation device 4 and the grid filter device 3 can be provided with a tank body, and materials are discharged into the tank body firstly and then pumped into the separation device 4 through a pump body. Of course, the positions of the separation device 4 and the grid filter device 3 can be different in different communication modes, when the communication modes are pipelines, the close arrangement can be adopted, so that pipelines are saved, and when the two are indirectly communicated through the tank body, the two can be arranged relatively far. Of course, the communication mode and the relative position between the separation device 4 and the grid filter device 3 are not particularly limited, and the requirements of the application are satisfied as long as the materials can be conveyed from the grid filter device 3 to the separation device 4.

In this embodiment, the third preset value may be 0.05 mm. The particles in this size range are typically fine sand. In order to be able to feed the liquid to a sewage treatment plant or directly drain it into a sewer line, it is also necessary to separate the fine sand from the liquid. The third preset value may be between 0.05 mm and 0.2 mm, and the operator may determine according to the actual use requirement, which is not limited in the present application.

In the present embodiment, the separation device 4 may be a cyclone 41. The cyclone 41 separates out the silt having a particle size greater than a third preset value by centrifugal force. Specifically, referring to fig. 3, the cyclone 41 includes a conical housing 411, a feed inlet 412 disposed at an upper portion of the conical housing 411, a sand outlet 413 disposed at a bottom portion of the conical housing 411, and an overflow port 414 disposed at a top portion of the conical housing 411; the feed direction of the feed port 412 is tangential to the cross-sectional profile of the conical housing 411.

The tapered housing 411 may be a housing having a chamber formed therein. The housing may be of a metallic material, such as stainless steel, aluminum alloy, or the like. The housing may also be of a non-metallic material, such as plastic. The tapered housing 411 may be disposed in a longitudinal direction. The upper portion of the conical housing 411 may have a larger diameter than the lower portion thereof. The taper of the conical housing 411 and the volume of the conical housing 411 may be determined according to actual use requirements.

The top of the conical housing 411 may be provided with a top cover, which can close the top of the conical housing 411. The feed inlet 412 may be disposed on a side wall of the conical housing 411 and near the top of the housing, the feed inlet 412 may be directly communicated with the third outlet 32, and the material (liquid) output from the third outlet 32 may enter the conical housing 411 through the feed inlet 412; alternatively, the feed port 412 of the cyclone 41 is communicated with the booster pump 5; the pressurizing pump 5 can input the substance discharged from the third outlet 32 into the tapered housing 411; or the booster pump 5 may be provided in the tank, and the booster pump 5 can pump the material (liquid) inputted into the tank from the third outlet 32 into the tapered housing 411.

Specifically, the feeding direction of the feeding port 412 is the tangential direction of the cross-sectional profile of the conical shell 411, that is, when the material enters the conical shell 411, the moving direction of the material can be tangential to the cross-sectional profile, so that the material can move along the side wall, and the material can rotate around the axis of the conical shell 411 due to the circular cross section of the side wall, and when the material rotates, due to the action of centripetal force, fine sand with higher density in the material is thrown to the edge of the material and attached to the side wall of the conical shell 411, and falls to the bottom of the conical shell 411 by self gravity, so that the fine sand can be separated from the material.

In order to discharge fine sand accumulated at the bottom of the cone-shaped casing 411, the bottom of the cone-shaped casing 411 is provided with a sand outlet 413, and fine sand falling into the bottom of the cone-shaped casing 411 can be discharged through the sand outlet 413. The sand discharge port may be an opening formed at the bottom of the conical housing 411. Preferably, the sand outlet 413 may be in communication with a sand-water separator 415. Wherein the sand-water separator 415 includes a second housing 416 and a second screw 417 positioned within the second housing 416. One end of the second housing 416 communicates with the bottom of the conical housing 411. The second screw 417 may be sleeved in the second housing 416 and the second screw 417 is disposed obliquely with respect to the horizontal plane. The sand-water separator 415 has a second output and a second input. The second input may be an end of the second housing 416 connected to the conical housing 411. One end of the second screw 417 may be located on the second input end and the other end of the second screw 417 may be located on the second output end. The fine sand may enter the second housing 416 from one end of the second housing 416, and the second screw 417 in turn conveys the fine sand to the second output, from which the fine sand is discharged out of the separating apparatus 4.

In order to make the moisture content of the fine sand discharged from the separation device 4 lower, the second output end is higher than the second input end, so that the water in the fine sand can be discharged in the opposite direction to the movement direction of the second screw 417 under the action of gravity in the process of being conveyed by the second screw 417, and a water outlet is correspondingly arranged below the second input end, so that the water discharged from the fine sand can be discharged from the water outlet and the position of the water outlet is relatively lower, thereby avoiding residual water in the separation device 4.

In an alternative embodiment, a first tank 6 may also be provided between the organic separation device and the separation device 4 in order to increase the separation effect of the separation device 4. The first tank 6 is communicated with the third outlet 32, so that the material output by the third outlet 32 can enter the first tank 6.

The first tank body 6 may also be referred to as a temporary storage tank, which may be formed by concrete casting or may be a housing formed by welding steel plates. After the material (liquid) enters the first tank body 6, fine sand in the material can be deposited at the bottom of the tank body, the bottom of the tank body can be provided with the booster pump 5, the booster pump 5 can further pump a sand-water mixture containing a large amount of fine sand at the bottom of the tank body into the cyclone separator 41, and the cyclone separator 41 can further separate the fine sand. By providing the first tank 6 and the booster pump 5, the fine sand content per unit volume of the material fed into the cyclone 41 can be increased, and the separation efficiency of the cyclone 41 can be further improved.

In an alternative embodiment, the sludge treatment system further comprises a pretreatment device for treating sewage in the sludge. The pretreatment device comprises a second tank body 7 and a grid arranged on the second tank body 7. Specifically, the grids comprise a first grid arranged at the top of the second tank body 7 and a second grid positioned below the first grid; the grid holes of the first grid are larger than the grid holes of the second grid. For example, the grid holes of the first grid may be square holes, which may have a size of 100x100 mm, for filtering out bulky impurities in the sewage, such as plastic bags, large leaves and branches, etc. The grid holes of the second grid may be square holes or circular holes, and when the grid holes are circular holes, the diameter of the circular holes may be 5 mm, and when the grid holes are square holes, the size of the square holes may be 5x5 mm. The sewage enters the second tank body 7 after being filtered by the grille, and the pretreated sewage is conveyed to the first inlet 11 by the conveying pump arranged in the second tank body 7.

In another alternative embodiment, the sludge treatment system may further comprise a third tank 8 for storing the sludge, and a transfer device 9. Wherein the conveyor 9 is able to convey the muddy matter in the third tank 8 to the first inlet 11. Specifically, after the sewage in the sludge tank truck is discharged to the second tank body 7, the remaining muddy matter can be poured into the third tank body 8. The third tank 8 may be a mud storage tank. The mud storage tank can be a tank body formed by concrete pouring or a shell formed by steel plate welding.

The conveyor 9 may convey the muddy matter in the third tank 8 to the first inlet 11. Wherein, the conveying device 9 can be a grab bucket, and the grab bucket can grab the sludge in the third tank body 8 and convey the sludge to the first inlet 11; alternatively, the conveying device 9 may be a pipeline, one end of the pipeline is communicated with the third tank body 8, the other end of the pipeline is communicated with the second inlet 21, and the sludge can be further conveyed to the second inlet 21 through the pipeline.

In another alternative embodiment, in order to improve the air quality of the environment surrounding the sludge treatment system, the sludge treatment system further comprises a deodorizing device (not shown), which may comprise a plurality of deodorizing devices and be respectively arranged on the members, or may be a large device which can cover the whole system and can be used for deodorizing the materials in the members of the sludge treatment system and the surrounding environment.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the inventors regard such subject matter as not be considered to be part of the disclosed subject matter.

Claims

1. A sludge treatment system, comprising:

a first screening device; the first screening device comprises a first inlet and a first outlet, the first inlet is used for inputting sludge, the first screening device can separate coarse materials with the particle size larger than a first preset value from the sludge, and the rest part of the coarse materials are output from the first outlet; the first preset value is 15 mm;

a second screening device; the second screening device comprises a second inlet and a second outlet, wherein the second inlet is used for inputting the output of the first outlet; the second screening device can separate fine sand with the grain size larger than a second preset value from the input material and output the rest part from the second outlet; the second preset value is 0.2 mm; the second screening device is arranged close to the first screening device and is positioned below the first screening device; the first outlet is opposite to the second inlet, and the material output by the first outlet directly falls into the second inlet;

a grille filter; the grid filter device comprises a third inlet and a third outlet, the third inlet is used for inputting the output of the second outlet, and the grid filter device can separate organic matters in the input materials and output the rest part of the organic matters from the third outlet; the filtering range of the grid filtering device is 3-15 mm;

a separation device; the separation device is used for separating out sediment with the grain size larger than a third preset value from the material output by the third outlet; the third preset value is 0.05 millimeter; the separation device is a cyclone separator; the cyclone separator separates out sediment with the grain size larger than the third preset value through centrifugal force; a first tank body is arranged between the grid filtering device and the separating device; the third outlet of the grid filter device is communicated with a first tank body; the pressurizing pump is arranged at the bottom of the first tank body;

the second screening device comprises a sand washer; the sand washer can separate fine sand with the grain diameter larger than 0.2 mm by utilizing the wall attaching effect;

the sand washer comprises a conical container, an input mechanism arranged at the upper part of the conical container, a stirring mechanism positioned in the conical container, a water delivery mechanism positioned at the lower part of the conical container and a sand delivery mechanism connected with the bottom of the conical container; the input mechanism is used for inputting the substance output by the first outlet; the water delivery mechanism is used for delivering water upwards so as to separate organic matters from fine sand; the water delivery mechanism delivers pressurized water into the conical container, and the water flow direction is upward; the pressurized water entering the conical container agitates the fine sand, so that a fluidized sand bed is formed at the position where the fine sand is deposited; the sand conveying mechanism is used for discharging fine sand separated by the sand washer; the input mechanism is a pipeline, and one end of the pipeline extending into the cavity of the conical container is in a horn shape; the horn mouth structure ensures that the material entering the conical container has a higher speed and can be guided to the side wall of the conical container, so that fine sand in the material can contact with the side wall, and the fine sand moves downwards along the side wall and gathers at the bottom of the conical container; the other end of the pipeline is communicated with the second inlet;

the stirring mechanism comprises a motor and stirring blades which are rotationally connected with the motor; the motor drives the stirring blade to stir the materials in the conical container; the sand-water mixture rotates at a low speed in the conical container under the drive of the stirring blade;

the sand conveying mechanism comprises a first shell and a first screw rod positioned in the shell; the first screw rod is obliquely arranged relative to the horizontal plane; the sand conveying mechanism is provided with a first output end and a first input end; the first output end is higher than the first input end; the first input end is communicated with the bottom of the conical container; and a water outlet is also arranged below the first input end.

2. The sludge treatment system of claim 1 wherein an upper portion of the conical vessel is provided with a drain in communication with the grid filtration device; the liquid in the conical container can enter the grid filter device through the liquid discharge pipe by means of gravity.

3. The sludge treatment system of claim 1 wherein the grid filtration device is a rotary drum grid or an internal inflow screen grid.

4. The sludge treatment system of claim 1, wherein the cyclone separator comprises a conical housing, a feed inlet disposed at an upper portion of the conical housing, a sand outlet disposed at a bottom portion of the conical housing, and an overflow outlet disposed at a top portion of the conical housing; the feeding direction of the feeding hole is the tangential direction of the cross section outline of the conical shell.

5. The sludge treatment system of claim 4, wherein the feed inlet of the cyclone separator is communicated with a booster pump; the booster pump is capable of inputting the material discharged from the third outlet to the cyclone separator.

6. The sludge treatment system of claim 5 wherein the sand outlet communicates with a sand-water separator; the sand-water separator comprises a second shell and a second screw rod positioned in the second shell; the second screw rod is obliquely arranged relative to the horizontal plane; the sand-water separator is provided with a second output end and a second input end; the second output end is higher than the second input end; the second input end is communicated with the bottom of the conical container; a water outlet is arranged below the second input end.

7. The sludge treatment system of claim 1 further comprising: a third tank for storing the mud in the sludge and a conveying device; the conveying device can convey the muddy matter in the third tank body to the first inlet.

8. The sludge treatment system of claim 1 further comprising a deodorizing device.