CN112707614A

CN112707614A - Device for treating sludge through biological drying

Info

Publication number: CN112707614A
Application number: CN202110007255.0A
Authority: CN
Inventors: 杨英英; 陈传好; 王涛; 王萍; 王媚; 潘震; 任升; 郑玉丽
Original assignee: Zhuzhou Times New Material Technology Co Ltd
Current assignee: Zhuzhou Times New Material Technology Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-04-27
Anticipated expiration: 2041-01-05
Also published as: CN112707614B

Abstract

The invention provides a device for treating sludge through biological drying, which belongs to the field of sludge treatment and comprises a tank body and a feeding device, wherein the feeding device is arranged at the upper end of the tank body and is used for conveying sludge into the tank body; the material distribution device is arranged in the tank body and is provided with a plurality of adjustable material distribution holes; the feeding device conveys sludge into the tank body, and the sludge is uniformly scattered in the tank body through the distributing holes of the distributing device.

Description

Device for treating sludge through biological drying

Technical Field

The invention relates to a device for treating sludge through biological drying, in particular to an ecological moving bed for biological drying, belonging to the field of sludge treatment.

Background

Along with the continuous improvement of the sewage treatment rate and the sewage treatment degree in China, the urban sludge yield also increases year by year. The municipal sludge is mainly aerobic microorganisms, and simultaneously comprises solid matters such as silt, fibers, animal and plant residues and the like mixed in sewage, and adsorbed organic matters, heavy metals, germs, insect eggs and the like. If a large amount of municipal sludge is not properly disposed, serious secondary pollution will be caused.

At present, the sludge treatment method mainly comprises landfill, land utilization, incineration and the like. Because the water content of the municipal sludge is usually higher, the water content of the municipal sludge is still about 80 percent after concentration and dehydration treatment, and the municipal sludge has the characteristics of large volume, unfavorable transportation, unstable property and the like. Direct landfill occupies a large amount of land, and leachate pollutes underground water; land utilization is greatly limited due to large transportation volume, difficult dispersion and easy pollution to underground water; direct incineration also has a low calorific value due to low solid content, and cannot maintain effective spontaneous combustion, so that a large amount of auxiliary fuel is consumed, and the disposal cost is obviously increased. Therefore, the key to solve many problems encountered in the sludge treatment process at present is to carry out drying treatment on the municipal sludge and reduce the water content of the sludge.

The traditional sludge drying method adopts a sludge drying bed form, sludge is accumulated in an outdoor drying bed, and the sludge is dried under the action of natural ventilation and gravity. The modern drying process is mainly heat drying, namely a process for evaporating water in sludge by an external heating source, and has the advantages of small floor area, obvious reduction, flexible product application and the like. However, the heat drying process has many problems, mainly including high investment and operation cost, high equipment operation energy consumption, and dust explosion potential safety hazard, and is difficult to be popularized and applied in large scale in China. Therefore, the development of a more economical and energy-saving drying technology becomes an urgent need for municipal sludge treatment in China.

Biodesiccation was first proposed by jewell et al, Connell university, USA, in 1984 when studying the operational parameters of cow dung bio-desiccation, sometimes called bio-desiccation, biostabilization. The biological drying is a treatment process which adopts a process control means, utilizes the bioenergy generated by the degradation of organic matters in the high-temperature aerobic fermentation process of microorganisms and is matched with forced ventilation to promote the evaporation and removal of water, thereby realizing the rapid drying.

At present, biological drying processes at home and abroad are various in form, and common biological drying technologies comprise strip-stack type fermentation drying and fermentation tank (bin) type fermentation drying. The strip pile type fermentation is generally open-air fermentation, and the raw material mixture is generally piled into a strip pile, the section of the strip pile can be trapezoid or triangular, and the strip pile type fermentation method is a common aerobic fermentation method. The strip stacks are too large, an anaerobic zone is easily generated in the center, and odor is generated when the stacks are turned; the stack is too small, dissipating heat quickly, and it is difficult to ensure killing of pathogens and weed seeds. Fermentation tank type fermentation is carried out in a factory building or a tunnel bin and can be divided into a sunlight shed fermentation tank and a tunnel type fermentation bin, and the existing common fermentation process generally has uneven mass transfer and long fermentation time; the system occupies large area; the odor is big, and the collection and the disposal are difficult.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a device for treating sludge through biological drying, which can ferment in a tank body, is uniform in accumulation, good in fermentation effect and convenient to move.

The invention provides a device for treating sludge through biological drying, which comprises:

a tank body which is provided with a plurality of tanks,

the feeding device is arranged at the upper end of the tank body and is used for conveying sludge into the tank body;

the material distribution device is arranged in the tank body and is provided with a plurality of adjustable material distribution holes;

the feeding device conveys sludge into the tank body, and the sludge is uniformly scattered in the tank body through the distributing holes of the distributing device.

The invention has the further improvement that the material distribution device comprises a circular material distribution disc, a rotatable material pushing device is arranged on the material distribution disc, and an adjusting disc for adjusting the material distribution holes is stacked below the material distribution disc;

after the sludge falls onto the material distribution disc, the sludge is spread on the upper surface of the material distribution disc through the material pushing device and falls onto the lower part of the tank body through the material distribution holes.

The invention has the further improvement that the material distribution holes are annularly arranged in a plurality of groups along the center of the material distribution disc; and the distribution holes are fan-shaped or trapezoid matched with the annular positions where the distribution holes are located.

The invention has the further improvement that the adjusting disc is of a circular structure which is concentric with the material distributing disc, and a plurality of layers of adjusting holes are arranged at the annular position on the adjusting disc;

the adjusting disc can rotate relative to the material distribution disc, and when the adjusting hole is overlapped with the material distribution hole or partially overlapped with the material distribution hole, the material distribution hole is in an open state; when the adjusting hole is staggered with the material distributing hole, the material distributing hole is in a closed state.

The invention has the further improvement that a first group of cloth holes, a second group of cloth holes and a third group of cloth holes are sequentially arranged on the cloth disc from the center to the edge in the circumferential direction, and a first group of adjusting holes, a second group of adjusting holes and a third group of adjusting holes are sequentially arranged on the adjusting disc from the center to the edge in the circumferential direction.

The invention has the further improvement that the number of the third group of the cloth holes is twice of that of the first group of the cloth holes, and the number of the third group of the adjusting holes is twice of that of the first group of the adjusting holes;

when the third group of cloth holes and the third group of adjusting holes are overlapped, the first group of cloth holes and the first group of adjusting holes are overlapped, or the first group of adjusting holes are positioned between the two first group of cloth holes.

In a further improvement of the present invention, when the second group of the distribution holes and the second group of the adjustment holes coincide, the first group of the distribution holes and the third group of the distribution holes are both in a closed state.

The invention is further improved in that the material pushing device comprises at least one blade, the rotating shaft of the blade is superposed with the central shaft of the material distribution disc, and the blade is an arc-shaped blade.

The invention is further improved in that the middle part of the material distribution disc is provided with a central support rod connected with a top cover of the tank body, and the central support rod is provided with a paving rotating shaft driving the material pushing device to rotate and an adjusting rotating shaft driving the adjusting disc to rotate.

The invention is further improved in that a discharging device is arranged at the bottom of the tank body, and the sludge is discharged out of the tank body through the discharging device after being dried.

Compared with the prior art, the invention has the advantages that:

the device for treating sludge through biological drying can be fermented in the tank body, and has uniform accumulation and good fermentation effect. The device for treating sludge through biological drying does not need an external heating source, does not need additional auxiliary materials or extra strains, dries by utilizing a large amount of biological energy released by the growth and the propagation of microorganisms in the sludge, only needs the sludge conveying and the aeration fan to consume electricity, and has low operation cost. Realizes medium temperature composting at 55-80 ℃ for more than 5 days, meets the composting requirement, and can be used as a fertilizer for landscaping. The vertical gravity flow design is adopted, pile turning is not needed, the vertical design occupies a very small area which is only 10% of the area occupied by the conventional compost;

meanwhile, no odor is discharged, and no deodorization is needed. The whole equipment system adopts a closed design, is free of odor overflow, does not need secondary cost increase to install an expensive deodorization system, can be directly installed in a plant area, carries out sludge centralized treatment, and can directly discharge condensed water without secondary treatment. The design of a closed system is adopted, so that the heat pump can be operated efficiently in winter without heat loss, and the heat pump can be utilized in hundred percent without limitation of seasons.

The tank body is totally closed, the tank body works at the medium temperature of 55-80 ℃, the dust concentration is less than 60g/m3, the particle temperature is less than 70 ℃, the potential hazards of dust raising and explosion are avoided, the discharge temperature is less than 50 ℃, secondary cooling is not needed, the tank body can be directly stored, and the safety is high.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic structural view showing an apparatus for treating sludge by bio-drying according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a material distribution device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a material distribution tray according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of an adjustment disk according to an embodiment of the present invention;

FIG. 5 is a schematic top view of a dispensing structure showing a first set of dispensing openings in an open position, according to an embodiment of the present invention;

FIG. 6 is a schematic top view of a dispensing structure showing a second set of dispensing openings in an open position, according to an embodiment of the present invention;

FIG. 7 is a schematic top view of a dispensing structure showing a third set of dispensing openings in an open position according to an embodiment of the present invention;

FIG. 8 is a schematic top view of a dispensing structure according to an embodiment of the present invention, showing the dispensing opening closed.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

The meaning of the reference symbols in the drawings is as follows: 1. the material distribution device comprises a tank body, 2, a material distribution device, 11, a feeding device, 12, a discharging device, 21, a material distribution disc, 22, an adjusting disc, 23, a material pushing device, 24, material distribution holes, 25, adjusting holes, 26 and blades.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

Fig. 1 schematically shows an apparatus for treating sludge by bio-drying according to an embodiment of the present invention, comprising a tank 1. The tank body 1 is a closed space, and a top cover is arranged at the upper part of the tank body. A feeding device 11 is arranged on the top cover of the tank body 1, and the feeding device 11 conveys external sludge into the tank body 1. The tank body 1 is internally provided with a material distribution device 2, and the material distribution device 2 uniformly distributes sludge in the tank body 1, so that the sludge in the tank body 1 can be uniformly accumulated. In this embodiment, the material distribution device 2 is provided with a plurality of adjustable material distribution holes 24. The feeding device 11 conveys the sludge into the tank body 1 and the sludge is uniformly scattered in the tank body 1 through the distributing holes 24 of the distributing device 2.

When the device for treating sludge by biological drying according to the embodiment is used, sludge is conveyed into the tank body 1 through the feeding device 11, the sludge can be uniformly distributed in the tank body 1 through the distributing device 2, and the opening and closing of the distributing holes 24 can be adjusted to adjust the stacking shape, so that the appropriate stacking height can be selected as required. Preferably, an aeration device can be arranged in the tank body 1, air is input through the aeration device, and self-drying is carried out by utilizing heat generated in the microbial metabolism process. This embodiment is through jar 1 fermentation treatment mud of body, and its jar body 1 is convenient for remove, need not pile up in the open air, does not influence the environment.

In one embodiment, the material distribution device 2 comprises a circular material distribution disc 21, and the material distribution holes 24 are arranged on the material distribution disc 21. The upper surface of the material distribution disc 21 is provided with a selectable material pushing device 23, and the lower surface is stacked with an adjusting disc 22 for adjusting the material distribution holes 24; the adjusting disc 22 is also of a circular structure and is arranged concentrically with the cloth disc 21. After the sludge falls onto the material distribution disc 21, the sludge is paved on the upper surface of the material distribution disc 21 through the material pushing device 23 and falls to the lower part of the tank body 1 through the material distribution holes 24.

When the device for treating sludge by biological drying according to the embodiment is used, the state of the material distribution holes 24 on the material distribution disc 21 can be changed by rotating the angle of the adjusting disc 22, so that the distribution condition of the conducted material distribution holes 24 can be changed, and the accumulation condition of falling materials can be adjusted.

In one embodiment, the material distribution holes 24 are divided into a plurality of groups, the material distribution holes 24 of each group are annularly arranged on the material distribution disc 21, and the annular circle is the center of the material distribution disc 21. In the present embodiment, the material distribution holes 24 have a fan-shaped or trapezoid-shaped structure, wherein the fan-shaped structure is located on the ring shape of the material distribution holes 24.

In one embodiment, the adjusting disk 22 is a circular structure concentrically arranged with the material distribution disk 21, and a plurality of groups of adjusting holes 25 are arranged at annular positions on the adjusting disk 22, and each group of adjusting holes 25 corresponds to one group of material distribution holes 24. The adjusting disc 22 can rotate relative to the material distribution disc 21, and when the adjusting hole 25 is overlapped or partially overlapped with the material distribution hole 24, the material distribution hole 24 is in an open state; when the adjusting hole 25 is staggered with the material distribution hole 24, the material distribution hole 24 is in a closed state.

When the cloth feeding device is used, the adjusting disc 22 is rotated according to needs, so that the adjusting holes 25 of the adjusting disc 22 are correspondingly overlapped or staggered with the cloth holes 24, and the cloth holes 24 are in an open or closed state.

In one embodiment, a first set of cloth holes 24, a second set of cloth holes 24 and a third set of cloth holes 24 are sequentially arranged on the cloth disc 21 from the center to the edge at the circumferential position, and a first set of adjusting holes 25, a second set of adjusting holes 25 and a third set of adjusting holes 25 are sequentially arranged on the adjusting disc 22 from the center to the edge at the circumferential position. The number, the position and the shape of the first group of cloth holes 24 and the first group of adjusting holes 25 are matched, the number, the position and the shape of the second group of adjusting holes 25 and the second group of cloth holes 24 are matched, and the number, the position and the shape of the third group of cloth holes 24 and the third group of adjusting holes 25 are matched, however, the position relationship between the groups of adjusting holes 25 on the adjusting disc 22 is different from the position relationship between the groups of cloth holes 24 on the cloth disc 21, for example, when the first group of cloth holes 24 and the first group of adjusting holes 25 are overlapped, the second group of cloth holes 24 and the second group of adjusting holes 25 are not necessarily overlapped; when the second set of cloth holes 24 and the second set of adjustment holes 25 coincide, the first set of cloth holes 24 and the first set of adjustment holes 25 do not necessarily coincide.

In a preferred embodiment, the number of the third set of cloth holes 24 is twice the number of the first set of cloth holes 24, and the number of the third set of adjustment holes 25 is twice the number of the first set of adjustment holes 25. When the third group of cloth holes 24 and the third group of adjusting holes 25 coincide, the first group of cloth holes 24 and the first group of adjusting holes 25 coincide, or the first group of adjusting holes 25 are located between two first group of cloth holes 24.

In a preferred embodiment, when the second set of cloth holes 24 and the second set of adjustment holes 25 coincide, the first set of cloth holes 24 and the third set of cloth holes 24 are both in a closed state.

During the use process, the opening and closing of the material distribution holes 24 can be realized in the following ways:

in the embodiment shown in fig. 5, the first group of material distribution holes 24 and the first group of adjustment holes 25 are overlapped, the third group of material distribution holes 24 and the third group of adjustment holes 25 are overlapped, at this time, the first group of material distribution holes 24 and the third group of material distribution holes 24 are in an open state and can pass through materials such as sludge, while the second group of adjustment holes 25 and the second group of material distribution holes 24 are staggered, and the second group of material distribution holes 24 are in a closed state. The material is piled up in the middle and at the edge in the tank body 1.

In the embodiment shown in fig. 6, the second set of cloth holes 24 and the second set of adjustment holes 25 coincide and are in an open state; the first group of cloth holes 24 and the first group of adjusting holes 25 are staggered and in a closed state, and the third group of cloth holes 24 and the third group of adjusting holes 25 are staggered and in a closed state. The materials are annularly stacked in the tank body 1.

In the embodiment shown in fig. 7, the third group of cloth holes 24 and the third group of adjustment holes 25 coincide and are in an open state; in contrast to the embodiment of fig. 5, the adjustment disc 22 is rotated by an angle which is the interval angle between two adjacent cloth holes 24 of the third group of cloth holes 24, and the first group of adjustment holes 25 is located between two adjacent cloth holes 24 of the first group of cloth holes 24. The first group of cloth holes 24 and the second group of cloth holes 24 are both in a closed state, and materials are stacked close to the middle part in the tank body 1.

In the embodiment shown in fig. 8, the material distribution holes 24 are staggered from the adjustment holes 25, so that the material distribution holes 24 are all closed.

In a preferred embodiment, the pushing device 23 comprises at least one blade 26, the rotation axis of the blade 26 coincides with the central axis of the distribution tray 21, and the blade 26 is an arc-shaped blade. Preferably, the number of the paddles 26 is two, and the paddles are arranged to be axisymmetrical with respect to the center.

In one embodiment, the middle of the distribution disc 21 is provided with a central support rod connected with the top cover of the tank body 1, and the central support rod is provided with a paving rotating shaft for driving the pushing device 23 to rotate and an adjusting rotating shaft for driving the adjusting disc 22 to rotate.

In one embodiment, a discharging device 12 is arranged at the bottom of the tank body 1, and the sludge is dried and then discharged out of the tank body 1 through the discharging device 12.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.

Claims

1. An apparatus for treating sludge by biological drying, comprising:

a tank body (1),

the feeding device (11) is arranged at the upper end of the tank body (1), and the feeding device (11) conveys sludge into the tank body (1);

the material distribution device (2) is arranged in the tank body (1), and a plurality of adjustable material distribution holes (24) are formed in the material distribution device (2);

the sludge is conveyed into the tank body (1) by the feeding device (11) and is uniformly scattered in the tank body (1) through the distributing holes (24) of the distributing device (2).

2. The device for treating sludge by biological drying according to claim 1, wherein the material distribution device (2) comprises a circular material distribution disc (21), a rotatable material pushing device (23) is arranged on the material distribution disc (21), and an adjusting disc (22) for adjusting the material distribution holes (24) is stacked below the material distribution disc;

after the sludge falls onto the material distribution disc (21), the sludge is spread on the upper surface of the material distribution disc (21) through the material pushing device (23) and falls to the lower part of the tank body (1) through the material distribution holes (24).

3. The apparatus for treating sludge by bio-drying according to claim 2, wherein the distribution holes (24) are arranged in groups along a central ring of the distribution disc (21); and the distribution holes (24) are in a fan shape or a trapezoid shape matched with the annular position of the distribution holes.

4. The device for treating sludge by biological drying according to claim 3, wherein the adjusting disc (22) is a circular structure concentrically arranged with the material distribution disc (21), and a plurality of layers of adjusting holes (25) are arranged at annular positions on the adjusting disc (22);

the adjusting disc (22) can rotate relative to the material distribution disc (21), and when the adjusting hole (25) is overlapped or partially overlapped with the material distribution hole (24), the material distribution hole (24) is in an open state; when the adjusting hole (25) is staggered with the material distribution hole (24), the material distribution hole (24) is in a closed state.

5. The device for treating sludge by biological drying according to claim 4, wherein a first group of distribution holes (24), a second group of distribution holes (24) and a third group of distribution holes (24) are sequentially arranged on the distribution disc (21) from the center to the edge at the circumferential position, and a first group of adjusting holes (25), a second group of adjusting holes (25) and a third group of adjusting holes (25) are sequentially arranged on the adjusting disc (22) from the center to the edge at the circumferential position.

6. The apparatus for the treatment of sludge by biodrying according to claim 5, wherein the number of the third set of distribution holes (24) is twice the number of the first set of distribution holes (24), and the number of the third set of adjustment holes (25) is twice the number of the first set of adjustment holes (25);

when the third group of cloth holes (24) and the third group of adjusting holes (25) coincide, the first group of cloth holes (24) and the first group of adjusting holes (25) coincide, or the first group of adjusting holes (25) are positioned between the two first group of cloth holes (24).

7. The apparatus for sludge treatment by biodrying according to claim 6, wherein when the second set of distribution holes (24) coincides with the second set of adjustment holes (25), both the first set of distribution holes (24) and the third set of distribution holes (24) are in a closed state.

8. The apparatus for the treatment of sludge by biodrying according to any of the claims 1 to 7, wherein the pushing means (23) comprises at least one blade (26), the rotation axis of the blade (26) coincides with the central axis of the distribution disc (21), and the blade (26) is an arc blade.

9. The device for treating sludge by biological drying according to claim 8, wherein a central support rod connected with the top cover of the tank body (1) is arranged in the middle of the distribution disc (21), and the central support rod is provided with a paving rotating shaft for driving the pushing device (23) to rotate and an adjusting rotating shaft for driving the adjusting disc (22) to rotate.

10. The apparatus for treating sludge by biological drying according to any one of claims 1 to 9, wherein the bottom of the tank body (1) is provided with a discharging device (12), and the sludge is dried and then discharged out of the tank body (1) through the discharging device (12).