Efficient aerobic granular sludge granulating device

Abstract

The utility model relates to a high-efficiency aerobic granular sludge granulating device. The granulation device disclosed by the embodiment of the utility model comprises a particle size classifier, a specific gravity winnowing device and a sludge activation reactor which are arranged in sequence, the sludge activation reactor comprises an activation reactor body, an aeration assembly and a nutrient solution input pipe, the activation reactor body comprises a conical part arranged at the bottom and a feeding part connected to the upper portion of the conical part, the feeding part is provided with a feeding port used for feeding winnowed sludge, the aeration assembly is arranged on the conical part and comprises an aeration pipe and an aeration head, and the aeration pipe is communicated with the aeration head. One end of the aeration pipe extends into the internal space of the conical part and is connected with the aeration head; a nutrient solution feeding hole is formed in the outer wall of the conical part, and the nutrient solution input pipe is connected with the nutrient solution feeding hole so as to guide a nutrient solution into the activation reactor main body. The granulation device disclosed by the embodiment of the utility model has elutriation and activation functions, and the sludge obtained by granulation is stable in performance, proper in specific gravity and excellent in settling performance.

Description

Technical Field

[0001] The utility model belongs to the field of water treatment equipment, and in particular relates to a high-efficiency aerobic granular sludge granulating device. Background Art

[0002] Aerobic granular sludge (AGS) technology has excellent sedimentation performance and a multi-layered structure of aerobic, anoxic and anaerobic from the outside to the inside. Therefore, AGS technology can achieve simultaneous and efficient removal of COD, N and P in the aerobic section, and no additional sedimentation tank is required for mud and water separation. According to research, aerobic granular sludge can save nearly 70% of the floor space, 20% to 30% of infrastructure investment and operating energy consumption while ensuring that the effluent quality meets the standards. However, compared with the outstanding technical advantages, aerobic granular sludge technology also has obvious disadvantages. Due to the lack of systematic granulation technology, AGS technology has shortcomings such as slow granulation speed (about 30-60 days) and long system startup cycle. Although domestic and foreign researchers have explored and studied the cultivation method, formation process, granulation influencing factors and application of AGS for about 20 years, the above problems still restrict the engineering application process of aerobic granular sludge in China.

[0003] Dewatered sludge is a kind of solid waste from municipal sewage treatment plants. Due to its huge output and high harmfulness, there is still a lack of important means for its proper treatment. However, from the perspective of resource utilization, dried sludge is a biological waste product produced by dehydrating activated sludge after flocculation and concentration. It contains more extracellular polymers and has advantages such as dense structure. At present, a large number of studies have used it as a raw material for the preparation of biochar, and it has been proved that biochar prepared from dewatered sludge has excellent adsorption properties for phosphorus, antibiotics, etc. in sewage. Dewatered sludge has strong biological potential. Using dewatered sludge to prepare granular sludge and then adding it to the reactor may help the rapid start-up of the aerobic granular sludge system, but there is currently a lack of simple and efficient granular sludge granulation process and equipment.

[0004] Based on this, it is necessary to develop a simple and efficient aerobic granular sludge granulation device, and then process the dewatered sludge into aerobic granular sludge, tap its biological potential, shorten the startup time of the AGS system, and promote the application of this technology. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a high-efficiency aerobic granular sludge granulation device, which can prepare high-performance granular sludge through simple processing operations. The sludge obtained by the granulation device of the utility model has stable performance, suitable specific gravity and excellent sedimentation performance.

[0006] The purpose of the present utility model is to provide an efficient aerobic granular sludge granulation device, which includes a particle size sieve, a specific gravity air separator, and a sludge activation reactor arranged in sequence;

[0007] The sludge activation reactor includes:

[0008] An activation reactor main body, which includes a conical part arranged at the bottom and a feeding part connected above the conical part. The feeding part has a feeding port for adding the air-separated sludge;

[0009] An aeration assembly, which is arranged in the conical part. The aeration assembly includes an aeration pipe and an aeration head. One end of the aeration pipe extends into the inner space of the conical part and is connected to the aeration head;

[0010] A nutrient solution input pipe. A nutrient solution feeding port is formed on the outer wall of the conical part. The nutrient solution input pipe is connected to the nutrient solution feeding port to introduce the nutrient solution into the activation reactor main body.

[0011] Further, an aeration valve is arranged on the aeration pipe;

[0012] A control valve is arranged on the nutrient solution input pipe.

[0013] Further, a blow-off valve is also arranged between the conical part and the feeding part;

[0014] A decanting selection port is also arranged on the outer wall of the feeding part.

[0015] Further, the particle size sieve includes a cylinder body and a variable-frequency jitter assembly arranged on the cylinder body. A plurality of filter meshes are arranged on the cylinder body at intervals along the axial direction of the cylinder body, and the pore diameters of the respective filter meshes distributed in the direction away from the opening of the cylinder body gradually decrease.

[0016] Further, the upper part of the cylinder body is formed into a cylindrical shape, the lower part of the cylinder body is formed into a conical shape, and a discharge valve is arranged at the bottom of the conical shape;

[0017] A spray head is arranged on the discharge valve facing the conical shape side, and the spray head is used to spray a slow-release polymer-coated binder into the cylinder body.

[0018] Further, a plurality of fixators are also arranged on the outer wall of the cylinder body.

[0019] Further, the specific gravity air separator includes:

[0020] A specific gravity screening and collection box, which includes a plurality of arranged side by side;

[0021] A blower, which is arranged on one side of the plurality of specific gravity screening and collection boxes;

[0022] The feed hopper is arranged above the specific gravity screening and collection box on the side close to the blower.

[0023] Furthermore, the specific gravity air separator further includes:

[0024] The air guide plates, there are two air guide plates, the two air guide plates are arranged oppositely, and the air guide plates extend along the arrangement direction of the plurality of specific gravity screening and collection boxes.

[0025] Furthermore, it also includes a specific gravity air separation feed pipe;

[0026] A discharge valve is formed at the bottom of the particle size sieve, one end of the specific gravity air separation feed pipe is connected to the discharge valve, and the other end is connected to the feed hopper.

[0027] Furthermore, it also includes two sludge activation feed pipes;

[0028] The specific gravity screening and collection box includes a first box body, a second box body, a third box body and a fourth box body arranged side by side in sequence along the air blowing direction of the blower;

[0029] The second box body and the third box body are respectively connected to the feed inlet of the sludge activation reactor through the sludge activation feed pipes.

[0030] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0031] 1. The high-efficiency aerobic granular sludge granulation device in the embodiment of the present utility model uses the sludge after dewatering and drying in a municipal sewage treatment plant as raw materials. This device does not need to set up complex pretreatment structures such as high temperature, low temperature or ultrasound, and has the advantage of simple operation process.

[0032] 2. The filter screen in the particle size sieve of the high-efficiency aerobic granular sludge granulation device in the embodiment of the present utility model can be flexibly replaced according to needs, and then granular sludge with different particle sizes can be prepared, realizing the compound addition of sludge with different particle sizes and specific gravities. Compared with the uncontrollability and uncertainty of the particle size of natural granulated sludge, it has the technical advantage of controlling the particle size grading addition.

[0033] 3. The specific gravity air separator of the high-efficiency aerobic granular sludge granulation device in the embodiment of the present utility model can flexibly adjust the sludge specific gravity air separation by changing the air supply flow of the blower of the air separation device, and then exclude both over-light and heavy sludge to ensure the stable physical and chemical properties of the prepared granular sludge, and can meet the expansion suspension requirements during the aeration process and the rapid sedimentation requirements during the sedimentation process.

[0034] 4. The sludge activation reactor in the high-efficiency aerobic granular sludge granulation device according to the embodiment of the present invention includes a washing and activation function. After mixing the granulated sludge with the prepared nutrient solution and adding it into the sludge activation reactor, the awakening and activation function of the microorganisms inside the granular sludge can be realized, and at the same time, the light flocs shed from the surface of the granular sludge are washed out.

[0035] 5. The granular sludge prepared by using the high-efficiency aerobic granular sludge granulation device according to the embodiment of the present invention has been proven to be able to shorten the start-up time of the aerobic granular sludge system to 3 - 5 days, can quickly achieve synchronous nitrification and denitrification, the water quality after treatment meets the first-class A standard specified in the urban sewage treatment discharge standard, the sludge performance is stable, the specific gravity is appropriate, and it has excellent sedimentation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention in combination with the drawings, wherein,

[0037] Figure 1 is a schematic structural diagram of the particle size sieve of the high-efficiency aerobic granular sludge granulation device according to the embodiment of the present invention;

[0038] Figure 2 is a schematic structural diagram of the specific gravity air separator of the high-efficiency aerobic granular sludge granulation device according to the embodiment of the present invention;

[0039] Figure 3 is a schematic structural diagram of the sludge activation reactor of the high-efficiency aerobic granular sludge granulation device according to the embodiment of the present invention.

[0040] Reference numerals:

[0041] 1. Cylinder body; 2. 12-mesh sieve; 3. Fixer; 4. 16-mesh sieve; 5. 20-mesh sieve; 6. 32-mesh sieve; 7. 48-mesh sieve; 8. Discharge valve; 9. Spraying head; 10. Fan; 11. First box body; 12. Second box body; 13. Third box body; 14. Fourth box body; 15. Air guide plate; 16. Feed hopper; 17. Nutrient solution input pipe; 18. Control valve; 19. Aeration pipe; 20. Aeration valve; 21. Aeration head; 22. Vent valve; 23. Decanting selection port; 24. Activation reactor main body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following further illustrates the present invention in combination with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the examples given are not intended to limit the present invention.

[0043] The purpose of the present utility model is to provide an efficient aerobic granular sludge granulation device, which includes a particle size sieve, a specific gravity air separator, and a sludge activation reactor arranged in sequence; the sludge activation reactor includes an activation reactor main body 24, and the activation reactor main body 24 includes a conical part arranged at the bottom and a feeding part connected above the conical part. The feeding part has a feeding port for adding the air-separated sludge; an aeration assembly is arranged in the conical part, and the aeration assembly includes an aeration pipe 19 and an aeration head 21. One end of the aeration pipe 19 extends into the internal space of the conical part and is connected to the aeration head 21; a nutrient solution feeding port is formed on the outer wall of the conical part, and a nutrient solution input pipe 17 is connected to the nutrient solution feeding port to introduce the nutrient solution into the activation reactor main body 24. That is to say, using the sludge dehydrated and dried in a municipal sewage treatment plant as raw material, after the sludge is crushed, it successively undergoes particle size screening by the particle size sieve, specific gravity screening by the specific gravity air separator, and elutriation activation by the sludge activation reactor, and then sludge with stable performance, suitable specific gravity, and excellent sedimentation performance can be obtained. Among them, the sludge activation reactor includes an elutriation activation function. After mixing the granulated sludge with the prepared nutrient solution and adding it into the sludge activation reactor, the awakening and activation function of the microorganisms inside the granular sludge can be realized, and at the same time, the light flocs peeled off from the surface of the granular sludge can be elutriated out. And an aeration assembly is arranged in the sludge activation reactor, which can transfer the oxygen in the air into the mixed solution and be utilized by the microorganisms, improving the mass transfer efficiency.

[0044] Further, an aeration valve 20 is arranged on the aeration pipe 19, and a control valve 18 is arranged on the nutrient solution input pipe 17. That is to say, by setting the aeration valve 20 to adjust the entering rate of the oxygen in the air, and by setting the control valve 18 to control the amount of the nutrient solution introduced into the activation reactor main body 24, so that the nutrient solution and the sludge are fully mixed.

[0045] Further, a drain valve 22 is also arranged between the conical part and the feeding part, and a decanting selection port 23 is also arranged on the outer wall of the feeding part. That is to say, by setting the decanting selection port 23 and the drain valve 22, the supernatant and suspended matter can be drained off. Through repeated elutriation activation, the sludge quality can be further improved, and granular sludge with plump particles, suitable specific gravity, and restored biological activity can be obtained.

[0046] Further, the particle size sieve includes a cylinder body 1 and a variable-frequency jitter assembly provided on the cylinder body 1. A plurality of filter meshes are arranged on the cylinder body 1 at intervals along the axial direction of the cylinder body 1, and the pore diameters of the filter meshes distributed along the direction away from the opening of the cylinder body 1 gradually decrease. That is to say, the filter meshes may include four, namely a 12-mesh sieve mesh 2, a 16-mesh sieve mesh 4, a 20-mesh sieve mesh 5, a 32-mesh sieve mesh 6, and a 48-mesh sieve mesh 7. The number of meshes of these four filter meshes gradually increases along the direction away from the opening of the cylinder body 1, and correspondingly, their pore diameters gradually decrease. Under the action of the variable-frequency jitter assembly, the preliminarily crushed granular sludge is screened according to different particle sizes. As an embodiment of the present invention, the granular sludge with an average particle size of 1000-1400 μm can be obtained by screening through the 16-mesh sieve mesh 4; the granular sludge with an average particle size of 830-1000 μm can be obtained by screening through the 20-mesh sieve mesh 5; the granular sludge with an average particle size of 500-830 μm can be obtained by screening through the 32-mesh sieve mesh 6; the granular sludge with an average particle size of 300-500 μm can be obtained by screening through the 48-mesh sieve mesh 7. The filter meshes in the particle size sieve can be flexibly replaced according to requirements, so as to prepare granular sludge with different particle sizes, realize the compound addition of sludge with different particle sizes and specific gravities, and have the technical advantage of controlling the particle size grading addition compared with the uncontrollability and uncertainty of the particle size of natural granulated sludge.

[0047] Further, the upper part of the cylinder body 1 is formed into a cylindrical shape, and the lower part of the cylinder body 1 is formed into a conical shape. A discharge valve 8 is arranged at the bottom of the conical shape; a spray head 9 is arranged on the side of the discharge valve 8 facing the conical shape, and the spray head 9 is used to spray a slow-release polymer coating adhesive into the cylinder body 1. That is to say, the cylinder body 1 with a cylindrical shape in the upper part is convenient for feeding, while the cylinder body 1 with a conical shape in the lower part is convenient for discharging the screened granular sludge. The discharge valve 8 is arranged at the bottom of the conical shape so that the staff can take out the granular sludge with the target particle size according to needs. By spraying the slow-release polymer coating adhesive into the cylinder body 1, the surface viscosity of the screened granular sludge can be ensured to reach 10000-50000 mPa·s, and a coating film with a thickness of about 1 mm is formed. The coating film can ensure the strength of the granular sludge, prevent disintegration, and improve the operation stability of the system. As an embodiment, the formula of the slow-release polymer coating adhesive is to add 1-2 kg of starch sugar, 0.1-0.2 kg of calcium chloride, 0.3-0.5 kg of magnesium chloride, and 0.4-0.5 kg of sodium chloride per ton of water, and the spraying ratio is to evenly spray 30-50 ml of the slow-release polymer coating adhesive per kilogram of granular sludge.

[0048] Further, a plurality of fixators 3 are also arranged on the outer wall of the cylinder body 1. By arranging the plurality of fixators 3, the 12-mesh sieve mesh 2, the 16-mesh sieve mesh 4, the 20-mesh sieve mesh 5, the 32-mesh sieve mesh 6, and the 48-mesh sieve mesh 7 are selectively fixed to screen out granular sludge with different particle sizes according to needs.

[0049] Furthermore, the specific gravity air classifier includes a specific gravity screening and collection box, a fan 10, and a feed hopper 16. The specific gravity screening and collection box includes a plurality of boxes arranged side by side; the fan 10 is disposed on one side of the plurality of specific gravity screening and collection boxes; the feed hopper 16 is disposed above the specific gravity screening and collection box on the side close to the fan 10. That is to say, by adjusting the air volume of the fan 10, granular sludge with different particle sizes is obtained, so that the granular sludge falls into the plurality of specific gravity screening and collection boxes arranged side by side according to different specific gravities. The specific gravity air classifier can flexibly adjust the specific gravity air separation of the sludge by changing the air supply flow rate of the fan 10 of the air separation device, thereby removing both overly light and heavy sludge to ensure the stable physical and chemical properties of the prepared granular sludge, and meeting the requirements of expansion and suspension during the aeration process and the rapid sedimentation requirements during the sedimentation process.

[0050] Furthermore, the specific gravity air classifier further includes a wind guide plate 15. There are two wind guide plates 15, and the two wind guide plates 15 are arranged oppositely and extend along the arrangement direction of the plurality of specific gravity screening and collection boxes. That is to say, by setting the wind guide plate 15, the granular sludge can accurately fall into each specific gravity screening and collection box.

[0051] Furthermore, it further includes a specific gravity air separation feed pipe. A discharge valve 8 is formed at the bottom of the particle size sieve. One end of the specific gravity air separation feed pipe is connected to the discharge valve 8, and the other end is connected to the feed hopper 16. That is to say, by setting the specific gravity air separation feed pipe, the granular sludge screened by the particle size sieve of the particle size screening device is introduced into the specific gravity air classifier to further improve the production efficiency of the granulation device.

[0052] Furthermore, it further includes two sludge activation feed pipes; the specific gravity screening and collection box includes a first box body 11, a second box body 12, a third box body 13, and a fourth box body 14 arranged side by side in sequence along the air blowing direction of the fan 10; the second box body 12 and the third box body 13 are respectively connected to the feed inlet of the sludge activation reactor through the sludge activation feed pipes. That is to say, by setting two sludge activation feed pipes, the granular sludge screened by the specific gravity of the specific gravity air classifier is introduced into the sludge activation reactor to further improve the production efficiency of the granulation device. As an embodiment of the present invention, the granular sludge falling into the second box body 12 and the third box body 13 can be selected as needed. Since the distance between the first box body 11 and the fan 10 is the smallest, and the distance between the fourth box body 14 and the fan 10 is the largest, the specific gravity of the granular sludge in the first box body 11 and the fourth box body 14 should be relatively large or small and should be discarded. By selecting the granular sludge in the second box body 12 and the third box body 13, granular sludge with an appropriate specific gravity can be obtained.

[0053] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the creation of the present utility model.

Claims

1. A highly efficient aerobic granular sludge granulation device, characterized in that: It includes a particle size screener, a specific gravity air separator and a sludge activation reactor which are arranged in sequence; The sludge activation reactor comprises: An activation reactor body (24), the activation reactor body (24) comprising a cone portion arranged at the bottom and a feed portion connected to the top of the cone portion, the feed portion having an inlet, the inlet being used to feed the sludge after air separation; an aeration assembly, the aeration assembly being arranged at the cone portion, the aeration assembly comprising an aeration pipe (19) and an aeration head (21), one end of the aeration pipe (19) extending into the inner space of the cone portion and being connected to the aeration head (21); A nutrient solution inlet pipe (17), the outer wall of the cone portion forms a nutrient solution inlet, and the nutrient solution inlet pipe (17) is connected to the nutrient solution inlet to introduce the nutrient solution into the activation reactor body (24).

2. The high-efficiency aerobic granular sludge granulation device according to claim 1, characterized in that: An aeration valve (20) is provided on the aeration pipe (19); A control valve (18) is provided on the nutrient solution input pipe (17).

3. The high-efficiency aerobic granular sludge granulation device according to claim 1, characterized in that: A vent valve (22) is also provided between the cone portion and the feed portion; A decanting selection port (23) is also provided on the outer wall of the feed portion.

4. The high-efficiency aerobic granular sludge granulation device according to claim 1, characterized in that: The particle size classifier comprises a cylinder (1) and a variable frequency shaking assembly arranged on the cylinder (1), wherein a plurality of filter screens are arranged on the cylinder (1) at intervals along the axial direction of the cylinder (1), and the apertures of the filter screens distributed along the opening direction away from the cylinder (1) gradually decrease.

5. The high-efficiency aerobic granular sludge granulation device according to claim 4, characterized in that: The upper part of the cylinder (1) is formed into a cylindrical shape, and the lower part of the cylinder (1) is formed into a cone shape, and a discharge valve (8) is arranged at the bottom of the cone; The discharge valve (8) is provided with a spray head (9) on one side facing the cone, and the spray head (9) is used to spray a slow-release polymer coating adhesive into the cylinder (1).

6. The high-efficiency aerobic granular sludge granulation device according to claim 4, characterized in that: A plurality of fixers (3) are also arranged on the outer wall of the cylinder (1).

7. The high-efficiency aerobic granular sludge granulation device according to claim 1, characterized in that: The specific gravity air separator comprises: A specific gravity screening collection box, wherein the specific gravity screening collection box comprises a plurality of boxes arranged side by side; A fan (10), the fan (10) being arranged on one side of the plurality of specific gravity screening collection boxes; A feed hopper (16), wherein the feed hopper (16) is arranged above the specific gravity screening collection box on a side close to the fan (10).

8. The high-efficiency aerobic granular sludge granulation device according to claim 7, characterized in that: The specific gravity air separator also includes: An air guide plate (15), wherein the air guide plates (15) include two air guide plates (15), the two air guide plates (15) are arranged opposite to each other, and the air guide plates (15) extend along the arrangement direction of the plurality of specific gravity screening collection boxes.

9. The high-efficiency aerobic granular sludge granulation device according to claim 7, characterized in that: Also included is a gravity air separation feed pipe; A discharge valve (8) is formed at the bottom of the particle size screener, one end of the specific gravity air separation feed pipe is connected to the discharge valve (8), and the other end is connected to the feed hopper (16).

10. The high-efficiency aerobic granular sludge granulation device according to claim 7, characterized in that: Also included are two sludge activation feed pipes; The specific gravity screening collection box comprises a first box body (11), a second box body (12), a third box body (13) and a fourth box body (14) which are sequentially arranged side by side along the blowing direction of the fan (10); The second box (12) and the third box (13) are respectively connected to the feed inlet of the sludge activation reactor through the sludge activation feed pipe.

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