CN212833364U

CN212833364U - Sludge aerobic fermentation equipment

Info

Publication number: CN212833364U
Application number: CN202021566625.1U
Authority: CN
Inventors: 张进
Original assignee: Sichuan Science City Tianren Environmental Protection Co ltd
Current assignee: Sichuan Science City Tianren Environmental Protection Co ltd
Priority date: 2020-08-01
Filing date: 2020-08-01
Publication date: 2021-03-30
Anticipated expiration: 2030-08-01

Abstract

A sludge aerobic fermentation device relates to the technical field of sludge resource utilization of sewage treatment plants. The sludge drying device comprises a drying device, wherein the drying device is sequentially provided with a sludge feeding hopper, a cutting device and a dried sludge discharging hopper from top to bottom, and a spiral conveyor is arranged in the dried sludge discharging hopper. The key technology lies in that the sludge aerobic fermentation equipment further comprises a fermentation bin and a packing device, wherein one end of the fermentation bin is provided with a feeding hole, the other end of the fermentation bin is provided with a discharging hole, and the drying device, the fermentation bin and the packing device are connected through a conveying device. The utility model has the advantages that: the equipment organically combines a drying technology and a composting technology, and carries out pre-drying on the sludge by using a low-temperature drying technology taking an air source heat pump technology as a core, so that the volume is reduced by about half, the area of a field required by later-stage composting is greatly saved, and the investment of operation cost is further reduced. Under the low temperature condition, the loss of organic matters in the sludge is very little, so that the system does not discharge odor, and the whole system is energy-saving and environment-friendly.

Description

Sludge aerobic fermentation equipment

Technical Field

A sludge aerobic fermentation device relates to the technical field of sludge resource utilization of sewage treatment plants, in particular to a device for fermentation after municipal sludge drying.

Background

With the large-scale construction and operation of sewage treatment plants in China, the sludge yield is greatly increased, a large amount of accumulated sludge not only occupies a large land area, but also contains a large amount of toxic and harmful substances which are difficult to degrade, such as pathogenic bacteria, parasites, pathogenic microorganisms, heavy metals, dioxin, radioactive elements and the like, and the sludge has high water content and large volume and brings difficulty to stacking and transportation, so the resource utilization difficulty is high. The traditional trough type composting is low in investment cost and wide in application, but odor pollution generated in the trough type composting process, long in composting period and large in occupied area are main factors restricting the popularization of composting technology, and multifunctional integrated composting equipment in the market is difficult to popularize in large quantities due to high investment operation cost and large occupied area. How to realize the reduction and the resource of the sludge, and reduce the treatment cost of the sludge and the secondary pollution to the environment is a technical difficulty to be solved.

Disclosure of Invention

The invention aims to solve the problem of providing the sludge aerobic fermentation equipment which is simple in structure and high in efficiency. The technical scheme is as follows:

the utility model provides a mud aerobic fermentation equipment, includes the mummification device, and the mummification device is from last to being equipped with mud feeder hopper, cutting device, guipure conveyor, mummification mud play hopper down in proper order, installs screw conveyer in the mummification mud play hopper, still is equipped with heat pump system by guipure conveyor. The key technology lies in that the sludge aerobic fermentation equipment further comprises a fermentation bin and a packing device, wherein one end of the fermentation bin is provided with a feeding hole, the other end of the fermentation bin is provided with a discharging hole, and the drying device, the fermentation bin and the packing device are connected through a conveying device.

A strain adding hopper is arranged on the outer side of the outlet of the drying device, and the outlet at the bottom of the strain adding hopper is positioned at the other end of the screw conveyor.

A first conveying device is arranged below the dried sludge discharging hopper, a third conveying device is arranged between a feeding hole of the fermentation bin and the packing device, the first conveying device and the third conveying device are connected through a second conveying device, a fourth conveying device is arranged at a discharging hole of the fermentation bin, and the other end of the fourth conveying device is connected with one end of the second conveying device.

A hollow stirring shaft is arranged in the fermentation bin, hollow blades are distributed on the hollow stirring shaft, aeration holes are formed in the hollow blades, and the diameter of each aeration hole is 2-5 mm.

The cross section of the hollow blade is rhombic, an inclination angle less than or equal to 5 degrees is formed between the hollow blade and the cross section of the hollow stirring shaft, and the two blades are sequentially arranged along the axial direction at 90 degrees.

The fermentation chamber is provided with a plurality of subareas which are communicated into a whole.

And a deodorizing air port is arranged at the top of the fermentation bin.

And an observation hole is formed in the top of the fermentation bin.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

1. the equipment organically combines a drying technology and a composting technology, and a low-temperature drying technology taking an air source heat pump technology as a core reduces the weight of sludge to 50-55% by about 60% in a pre-drying way at 40-55 ℃, so that the volume is reduced by about half, the area of a field required by later-stage composting is greatly saved, and the investment of operation cost is further reduced. The low-temperature heat pump technology can convert a low-quality heat source into a high-quality heat source, can dehumidify and heat air, and can continuously and circularly utilize the air, and the loss of organic matters in the sludge is very little under the low-temperature condition, so that no odor is discharged out of the system, and the whole system is energy-saving and environment-friendly.

2. The intermediate conveying device is fully utilized, the mixture of the strains and the sludge is realized through the conveying device, and the material mixing device is saved. One conveying device can convey dried sludge and compost clinker at the same time, so that mixed composting of sludge before composting and sludge after decomposition is realized, and the composting efficiency is improved; the motor of the other conveying device is a motor capable of rotating forward and backward, so that the function of feeding or discharging of the same conveying device is realized.

3. The process is carried out in a fully-closed box body, so that the explosion danger is avoided, and the escape of harmful gas is effectively avoided. The water separated from the sludge under the low temperature condition is relatively clean water, complex treatment is not needed, and secondary pollution to a water body is avoided. The composting process also adopts a fully-closed horizontal composting bin and is provided with a plasma deodorization device, and the generated odor is treated on site and is not discharged outside, so that the secondary pollution to the environment is not caused in the processes of sludge drying reduction and composting resource recovery.

4. The automation degree is high: whole sludge drying feeding, ejection of compact, bacterial mix transport, compost stirring aeration, the whole automatic operation of mud maturity ejection of compact packaging process to adopt PLC control, need not too much manual supervision, only need a small amount of workman regularly tour, and observe the mud maturity condition can, very big saving the cost of labor.

5. Because the sludge of the sewage plant has higher organic matter content, the requirement that the content of organic matters required in the compost is between 20 and 80 percent can be basically met, the organic matters are hardly lost by early drying, the water content of the dried sludge is low, the texture is loose and the air permeability is good, so that auxiliary materials such as straws and wheat bran can be not added in the later-stage compost fermentation, and only high-temperature fermentation strains are added. The nutrient content of the sludge after the compost is decomposed is more than 3 percent, and the sludge has no toxic and harmful substances, and can be used as a fertilizer for landscaping, even directly used as an agricultural fertilizer.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 1B-B;

fig. 4 is a schematic side view of the present invention;

fig. 5 is a partially enlarged view of fig. 4C.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.

As shown in fig. 1 to 5, a sludge aerobic fermentation apparatus comprises a low-temperature heat pump drying device 1, the low-temperature heat pump drying device 1 is sequentially provided with a sludge feed hopper 11, a sludge cutting device 12, a mesh belt conveying device 15 and a dried sludge discharge hopper 16 from top to bottom, a mixing screw conveyor 18 is installed in the dried sludge discharge hopper 16, and a heat pump system 13 is further arranged beside the mesh belt conveying device 15. The key technology lies in that the sludge aerobic fermentation equipment also comprises a horizontal sludge fermentation bin 3 and a rotten material packing device 5 which are operated in a closed mode, one end of the horizontal sludge fermentation bin 3 is provided with a feeding hole 34, the other end of the horizontal sludge fermentation bin is provided with a discharging hole 35, the low-temperature heat pump drying device 1 and the rotten material packing device 5 are located on the same side of the horizontal sludge fermentation bin 3, and the low-temperature heat pump drying device 1, the horizontal sludge fermentation bin 3 and the rotten material packing device 5 are connected together through a closed conveying device, so that the whole system is operated in a closed mode.

A strain adding hopper 17 is arranged on the outer side of an outlet of the low-temperature heat pump drying device 1, an outlet at the bottom of the strain adding hopper 17 is positioned at the other end of a mixing screw conveyor 18, the mixing screw conveyor 18 quantitatively conveys strains to a dried sludge discharging hopper 16, and the strains are preliminarily mixed with the dried sludge and then discharged out of the low-temperature heat pump drying device 1 from the lower part of the dried sludge discharging hopper 16.

A first conveying device 21 is arranged below a dried sludge discharging hopper 16, a third conveying device 23 is arranged between a feeding hole 34 of a horizontal sludge fermentation bin 3 and a decomposed material packing device 5, the first conveying device 21 and the third conveying device 23 are connected through a second conveying device 22, a fourth conveying device 24 is arranged at a discharging hole 35 of the horizontal sludge fermentation bin 3, and the other end of the fourth conveying device 24 is connected with one end of the second conveying device 22.

The horizontal sludge fermentation storehouse is equipped with 2 ~ 3 hollow (mixing) shafts 31 in 3, and hollow (mixing) shaft 31 is last evenly distributed has hollow blade 33, evenly sets up the aeration hole on the hollow blade 33, and aeration hole diameter is 2 ~ 5 mm.

As shown in fig. 4 and 5, the cross section of the hollow blade 33 is a diamond shape, wherein the taper angle is opposite to the stirring direction, an inclination angle less than or equal to 5 degrees is formed between the hollow blade 33 and the cross section of the hollow stirring shaft, and the two blades are arranged in sequence at 90 degrees along the axial direction.

The horizontal sludge fermentation bin 3 is provided with a plurality of partitions 38, and the partitions 38 are communicated into a whole.

3-6 deodorization air ports 36 are arranged at the top of the horizontal sludge fermentation bin 3.

Observation holes 37 are arranged at intervals at the top of the horizontal sludge fermentation bin 3 and are used for observing the composting conditions of all stages.

An accessory equipment room 4 is arranged at one end of the horizontal sludge fermentation bin 3, and a stirring shaft motor 41, an aeration blower 42, a plasma deodorization device 43, an electric control cabinet 45, an exhaust fan 46 and an equipment room door 44 are further arranged in the accessory equipment room 4.

In the figure 32 is an air inlet.

A sludge aerobic fermentation device comprises the following working processes:

blocky sludge with the water content of about 80 percent after mechanical dehydration in a sewage treatment plant enters a sludge slitting device 12 from a sludge feed hopper 11, is slit and formed in the sludge slitting device 12 to form fine sludge strips with good air permeability and falls onto a mesh belt conveying device 15, a uniform and air-permeable sludge layer is paved on a mesh belt along with the movement of a conveying mesh belt, a heat pump system 13 of a low-temperature heat pump drying device 1 can dehumidify and heat air at 40-55 ℃ to form hot dry air, and the hot dry air is driven by a blower 14 to circularly pass through the sludge layer on the mesh belt conveying device 15 from bottom to top, so that the sludge is dehydrated and dried to the water content of 50-55 percent. The volume and the weight of the dewatered sludge are reduced by about 60 percent, the volume is reduced by more than 50 percent, and the load of later-stage sludge fermentation is greatly reduced.

After being preliminarily mixed, the strains and the dried sludge are continuously mixed and conveyed to a feed port 34 of the horizontal sludge fermentation bin 3 through a first conveying device 21, a second conveying device 22 and a third conveying device 23 below the low-temperature heat pump drying device 1, and then uniformly fall into the fermentation bin 3 through 2 feed ports. The appearance of the horizontal sludge fermentation bin 3 is a strip shape which is communicated by a plurality of subareas 38 (namely, the internal space of the horizontal sludge fermentation bin 3 is divided into a plurality of areas with equal length), a stirring shaft motor 41 with a frequency converter is started after feeding for a period of time to drive the hollow stirring shaft 31 and the hollow blades 33 to rotate, and the cross sections of the hollow blades 33 are rhombic, wherein the taper angles are just opposite to the stirring direction, so that the resistance of sludge in the stirring process is reduced, and an inclination angle which is not more than 5 degrees exists between the rhombic blades and the axis, so that the sludge can be pushed forward while the blades rotate. Adjusting the frequency of a frequency converter of the stirring shaft motor 41 to enable the hollow stirring shaft to rotate at a fixed speed, slowly pushing the accumulated sludge forward until the sludge is fully accumulated in a subarea in the horizontal sludge fermentation bin 3, and stopping feeding, wherein the whole feeding time is about 1 h. After the feeding is finished, the aeration blower 42 is started to start aeration fermentation, the hollow blades are sequentially arranged at 90 degrees along the axial direction of the stirring shaft and are almost fully distributed on the whole sludge pile body, so that air can be uniformly delivered to all parts of the sludge pile body through aeration holes in the hollow blades even if the hollow stirring shaft 31 does not rotate, the plasma deodorization device 43 is intermittently started in the fermentation process, odor generated by fermentation is extracted and discharged after deodorization, and the stirring shaft motor 41 is intermittently started to slowly stir sludge and slowly propel the sludge. In order to ensure the continuous process, the sludge stirring and the sludge drying are started to be carried out simultaneously, which is equivalent to that the sludge stirring time in the fermentation bin is equal to the feeding time each time, the sludge is fed once every 2 days, the sludge in each fermentation area can be completely turned over once after about 1 hour of stirring each time, and the sludge is moved to the next fermentation area.

An observation hole 37 is arranged above each partition 38 so as to observe the sludge fermentation condition every day. The insertion temperature and oxygen content detector can detect whether the temperature and oxygen content in the sludge pile are normal or not, and the oxygen content needs to be kept between 5 and 15 percent. The oxygen content in the fermentation process is adjusted by adjusting the air quantity of the aeration blower, the temperature in the fermentation process is higher than 50 ℃ and is maintained for more than 5 days, the aeration rate and the aeration frequency can be properly increased when the compost temperature is too high, and the aeration rate can be properly reduced when the compost temperature is too low.

The sludge can be thoroughly decomposed in 14-21 days of composting in the closed bin body, and the fermented sludge is pushed out of the bin from a discharge hole 35 of the fermentation bin and is conveyed to a thoroughly decomposed material packing device 5 through a fourth conveying device 24, a second conveying device 22 and a third conveying device 23 for packing. Wherein, the second conveying device 22 and the third conveying device 23 are both feeding conveying devices for dried sludge and fermented sludge discharging equipment, the second conveying device 22 realizes the conveying of two kinds of sludge by arranging 2 feeding holes, when the moisture content of the dried sludge is large, the fourth conveying device 24 can be started at the same time of feeding, so that part of the fermented sludge and the dried sludge are mixed in the second conveying device 22 and then enter the fermentation bin 3. If the addition of the rotten clinker is not needed, the two conveying devices are staggered to be opened. And the driving motor of the third conveying device 23 can rotate in two directions, the motor rotates forwards when feeding to the horizontal sludge fermentation bin 3 is needed, and the motor rotates backwards when the decomposed sludge is needed to be conveyed to the packing device. Because the export of horizontal sludge fermentation storehouse 3 is higher, and have great space between 24 and the fourth conveyor to set up the chute of storage mud, and set up a plurality of discharge gates, consequently can the temporary storage thoroughly decomposed mud, make fourth conveyor 24 and first conveyor 21 the operating time that can stagger, reach different transport purposes.

The detected nutrient content of the sludge after the compost is decomposed is more than 3 percent, and indexes of harmful components such as heavy metal and the like all accord with the standard of the organic fertilizer, so the fertilizer can be used as a fertilizer for landscaping, and even can be directly used as an agricultural fertilizer. The whole set of equipment really realizes the reduction, harmlessness and reclamation of the sludge.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge aerobic fermentation device comprises a drying device (1), wherein the drying device (1) is sequentially provided with a sludge feed hopper (11), a slitting device (12), a mesh belt conveying device (15) and a dried sludge discharge hopper (16) from top to bottom, a spiral conveyor (18) is installed in the dried sludge discharge hopper (16), and a heat pump system (13) is arranged beside the mesh belt conveying device (15); the sludge aerobic fermentation equipment is characterized by further comprising a fermentation bin (3) and a packing device (5), wherein a feeding hole (34) is formed in one end of the fermentation bin (3), a discharging hole (35) is formed in the other end of the fermentation bin, and the drying device (1), the fermentation bin (3) and the packing device (5) are connected through a conveying device.

2. The sludge aerobic fermentation equipment as claimed in claim 1, wherein a blower (14) is arranged beside the mesh belt conveying device (15).

3. The sludge aerobic fermentation equipment as claimed in claim 1, wherein a strain adding hopper (17) is arranged outside the outlet of the drying device (1), and the outlet at the bottom of the strain adding hopper (17) is positioned at the other end of the screw conveyor (18).

4. The sludge aerobic fermentation equipment as claimed in claim 1, wherein a first conveying device (21) is arranged below the dried sludge discharging hopper (16), a third conveying device (23) is arranged between the feeding hole (34) of the fermentation bin (3) and the packing device (5), the first conveying device (21) and the third conveying device (23) are connected through a second conveying device (22), a fourth conveying device (24) is arranged at the discharging hole (35) of the fermentation bin (3), and the other end of the fourth conveying device (24) is connected with one end of the second conveying device (22).

5. The sludge aerobic fermentation equipment according to the claim 1, which is characterized in that a hollow stirring shaft (31) is arranged in the fermentation bin (3), hollow blades (33) are distributed on the hollow stirring shaft (31), aeration holes are arranged on the hollow blades (33), and the diameter of the aeration holes is 2-5 mm.

6. The aerobic sludge fermentation equipment as claimed in claim 5, wherein the hollow blades (33) have a rhombic cross section, and an inclination angle less than or equal to 5 degrees is formed between the hollow blades (33) and the cross section of the hollow stirring shaft, and the blades are arranged in sequence at 90 degrees along the axial direction.

7. The sludge aerobic fermentation equipment as claimed in claim 1, wherein the fermentation chamber (3) is provided with a plurality of partitions (38), and the partitions (38) are communicated with each other into a whole.

8. The sludge aerobic fermentation equipment as claimed in claim 1, wherein the top of the fermentation chamber (3) is provided with a deodorizing tuyere (36).

9. The sludge aerobic fermentation equipment as claimed in claim 1 is characterized in that the top of the fermentation chamber (3) is provided with a viewing hole (37).