CN220183049U - Efficient anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge - Google Patents
Efficient anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge Download PDFInfo
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- CN220183049U CN220183049U CN202321710868.1U CN202321710868U CN220183049U CN 220183049 U CN220183049 U CN 220183049U CN 202321710868 U CN202321710868 U CN 202321710868U CN 220183049 U CN220183049 U CN 220183049U
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- anaerobic fermentation
- fermentation system
- reaction tank
- efficient anaerobic
- retort
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- 238000000855 fermentation Methods 0.000 title claims abstract description 38
- 239000010802 sludge Substances 0.000 title claims abstract description 36
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 55
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 abstract description 16
- 230000004151 fermentation Effects 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000243 solution Substances 0.000 description 19
- 230000005484 gravity Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 150000004666 short chain fatty acids Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
The utility model discloses a high-efficiency anaerobic fermentation system for pretreating excess sludge based on calcium hypochlorite, which comprises a bottom plate, wherein two sides of the upper surface of the bottom plate are fixedly connected with vertical plates, a reaction tank is rotatably connected between the two vertical plates, one vertical plate is fixedly provided with a band-type brake motor for driving the reaction tank to rotate positively and negatively, the opening of the upper end of the reaction tank is provided with a tank cover, and the periphery of the tank cover is detachably connected with the reaction tank through a bolt connecting piece. Through putting into the retort with water and calcium hypochlorite, control stirring board removes and carries out the mixing operation with the cooperation of vortex ring, and the retort rotates simultaneously and can collect the solution that mixes to the liquid storage pot inside, can throw in mud and control solution and fall to the mud surface in the retort this moment, carries out fermentation mixing to mud, can control stirring board reciprocating motion again simultaneously when fermentation mixing, reaches good fermentation mixing effect, has realized the multi-purpose of a thing simultaneously, has improved the practicality.
Description
Technical Field
The utility model relates to the technical field of fermentation equipment, in particular to a high-efficiency anaerobic fermentation system for pretreating residual sludge based on calcium hypochlorite.
Background
A large amount of sludge is generated in the sewage treatment process, and anaerobic fermentation is a widely used method for stabilizing high-concentration organic sludge. The organic matter is decomposed anaerobically, a large amount of biomass energy sources with added values (such as short-chain fatty acid, methane, hydrogen and the like) are generated, and the sludge becomes a resource, wherein calcium hypochlorite is a disinfectant widely used for water purification, and because hypochlorous acid generated by hydrolysis of the calcium hypochlorite has a certain inactivating effect on microorganisms, the calcium hypochlorite is used for pretreating the sludge to promote dissolution, and the operation is simple, the energy consumption is relatively low, so that the calcium hypochlorite is an emerging sludge pretreatment means in recent years.
At present, the fermentation treatment process of sludge comprises the steps of mixing calcium hypochlorite with water to prepare a high-concentration solution, storing the solution by using a container independently, butting the container with the container for storing the sludge, injecting the container into the sludge for fermentation, and collecting generated gas, wherein the following defects also exist in the operation process:
the preparation process requires stirring equipment to mix calcium hypochlorite with water, and separate container equipment to store the mixed solution, and reaction equipment to hold sludge and solution, and more equipment is required, and the existing reaction container is simply that the sludge and the solution are placed together, and the sludge in the interior cannot be effectively contacted with the solution on the surface, so that the fermentation effect is limited.
Disclosure of Invention
The present utility model aims to solve the above problems and provide a high-efficiency anaerobic fermentation system for pretreating residual sludge based on calcium hypochlorite, which is described in detail below.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides a high-efficiency anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge, which comprises a bottom plate, wherein two sides of the upper surface of the bottom plate are fixedly connected with vertical plates, a reaction tank is rotationally connected between the two vertical plates, one vertical plate is fixedly provided with a band-type brake motor for driving the reaction tank to rotate positively and negatively, the opening of the upper end of the reaction tank is provided with a tank cover, the periphery of the tank cover is detachably connected with the reaction tank through a bolt connecting piece, one side of the tank cover is communicated with an exhaust pipe, a liquid storage tank is arranged above the tank cover and is communicated with the inner wall of the tank cover through a connecting pipe, and an electromagnetic valve for controlling liquid circulation is fixedly arranged on the connecting pipe;
the inside of retort is connected with the plug bush of its inner wall contact detachably, fixedly connected with a plurality of vortex rings on the inner wall of this plug bush, the inside of retort is equipped with the stirring board, and is provided with the drive assembly who is used for driving stirring board along retort axis direction reciprocating motion on the inner bottom of retort.
When the efficient anaerobic fermentation system based on the calcium hypochlorite pretreatment of the excess sludge is used, firstly, water and calcium hypochlorite powder are poured into a reaction tank, a tank cover is closed through a bolt connecting piece, a stirring plate is driven to reciprocate in the reaction tank through a driving component, meanwhile, a part of water is driven to move along with the stirring plate, when the stirring plate moves between two turbulence rings, the water falls from a gap and falls with the turbulence ring below, and further, repeated mixing is carried out;
after the mixing is finished, the reaction tank is driven to rotate through the band-type brake motor, at the moment, the solution in the reaction tank falls onto the surface of the tank cover under the action of gravity, the electromagnetic valve is opened, so that the solution flows into the liquid storage tank, then the electromagnetic valve is closed, the reaction tank is controlled to rotate reversely, the tank cover is taken down after the liquid storage tank is placed above, the sludge is poured into the reaction tank to close the tank cover, the electromagnetic valve is controlled to open, so that the solution flows into the reaction tank to react with the sludge in a contact manner, the stirring plate can be driven to reciprocate again (the reaction tank can be repeatedly rotated for a plurality of times when stirring the sludge, so that a better mixing effect is achieved), the fermentation effect of the sludge is improved, and gas generated by fermentation is conveyed into an external collecting container through an exhaust pipe.
Preferably, the bolt connecting piece comprises ear plates fixedly connected to the side wall of the tank cover, the four ear plates are uniformly distributed on the circumference of the tank cover by taking the axis of the tank cover as a reference, through holes are formed in the ear plates, bolts are inserted into the through holes, and nuts in threaded connection with the bolts are fixedly connected to the side wall of the reaction tank.
Preferably, the opening end of the reaction tank is fixedly connected with a sealing ring, and the opening end of the tank cover is provided with an embedded groove matched with the sealing ring.
Preferably, four cutting bars are fixedly connected to the side wall of the plug bush, the four cutting bars are uniformly distributed by taking the axis of the plug bush as a reference circumference, four limiting slots which are inserted with the cutting bars are formed in the inner wall of the reaction tank, and the length of each limiting slot is the same as that of each cutting bar.
Preferably, the turbulence rings are arranged in a truncated cone shape, and small diameter ends of the turbulence rings on two sides are arranged back to back.
Preferably, a plurality of turbulence rings are provided with turbulence holes, and the turbulence holes formed in two adjacent turbulence rings are staggered with each other.
Preferably, both sides of the stirring plate along the axis direction of the reaction tank are designed in a truncated cone shape, and the small diameter ends of the truncated cones at both sides of the stirring plate are arranged back to back.
Preferably, the driving assembly comprises a threaded rod which is rotationally connected to the inner bottom of the reaction tank, a threaded hole which is in threaded connection with the threaded rod is formed in the stirring plate, a motor which drives the threaded rod to rotate positively and negatively is fixedly arranged on the bottom surface of the reaction tank, a limiting slide rod is fixedly connected to the inner bottom of the reaction tank, a slide rod hole which is in sliding connection with the limiting slide rod is formed in the stirring plate, and a stabilizing sleeve which is sleeved with the optical shaft part at the end part of the threaded rod is fixedly connected to the inner bottom of the tank cover.
The beneficial effects are that:
through putting into the retort with water and calcium hypochlorite, control stirring board removes and carries out the mixing operation with the cooperation of vortex ring, and the retort rotates simultaneously and can collect the solution that mixes to the liquid storage pot inside, can throw in mud and control solution and fall to the mud surface in the retort this moment, carries out fermentation mixing to mud, can control stirring board reciprocating motion again simultaneously when fermentation mixing, reaches good fermentation mixing effect, has realized the multi-purpose of a thing simultaneously, has improved the practicality.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of the present utility model;
FIG. 2 is a disassembled perspective view of the can lid of the present utility model;
FIG. 3 is a front sectional view of the reaction tank of the present utility model;
fig. 4 is a perspective view of the insert of the present utility model.
The reference numerals are explained as follows:
1. a bottom plate; 2. a vertical plate; 3. a bolt connection; 3a, ear plates; 3b, perforating; 3c, a bolt; 3d, a screw cap; 4. a drive assembly; 4a, a threaded rod; 4b, a motor; 4c, a threaded hole; 4d, limiting the sliding rod; 4e, a slide bar hole; 5. a reaction tank; 6. a can lid; 7. a band-type brake motor; 8. an exhaust pipe; 9. a liquid storage tank; 10. a connecting pipe; 11. an electromagnetic valve; 12. a plug bush; 13. a turbulence ring; 14. cutting; 15. a limit slot; 16. a disturbance orifice; 17. an agitating plate; 18. a seal ring; 19. a stabilizing sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.
Referring to fig. 1-4, the utility model provides a high-efficiency anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge, which comprises a bottom plate 1, wherein two sides of the upper surface of the bottom plate 1 are fixedly connected with vertical plates 2, a reaction tank 5 is rotatably connected between the two vertical plates 2, one vertical plate 2 is fixedly provided with a band-type brake motor 7 for driving the reaction tank 5 to rotate positively and negatively, the upper end opening of the reaction tank 5 is provided with a tank cover 6, the periphery of the tank cover 6 is detachably connected with the reaction tank 5 through a bolt connecting piece 3, one side of the tank cover 6 is communicated with an exhaust pipe 8, a liquid storage tank 9 is arranged above the tank cover 6, the liquid storage tank 9 is communicated with the inner wall of the tank cover 6 through a connecting pipe 10, and an electromagnetic valve 11 for controlling liquid circulation is fixedly arranged on the connecting pipe 10;
the inside of retort 5 can be dismantled and be connected with the plug bush 12 rather than the inner wall contact, fixedly connected with a plurality of vortex rings 13 on the inner wall of this plug bush 12, the inside of retort 5 is equipped with stirring board 17, and be provided with on the inner bottom of retort 5 and be used for driving stirring board 17 along retort 5 axis direction reciprocating motion's drive assembly 4, it is worth mentioning that, liquid storage pot 9 surface can set up the discharge valve, when liquid storage pot 9 is located the below, in order to guarantee that liquid flows into liquid storage pot 9 smoothly under the action of gravity, extrude its inside gas from the discharge valve and collect solution.
Referring to fig. 2, the bolt connecting piece 3 includes an ear plate 3a fixedly connected to a side wall of the tank cover 6, and four ear plates 3a are uniformly distributed circumferentially with respect to an axis of the tank cover 6, through holes 3b are formed in the ear plates 3a, bolts 3c are inserted into the through holes 3b, a nut 3d in threaded connection with the bolts 3c is fixedly connected to a side wall of the reaction tank 5, and after the tank cover 6 is closed, the bolts 3c are simultaneously inserted into the through holes 3b and the nuts 3d to rotate, so that the purpose of fixing the tank cover 6 is achieved.
As an alternative embodiment, the sealing ring 18 is fixedly connected to the open end of the reaction tank 5, and the fitting groove adapted to the sealing ring 18 is provided at the open end of the tank cover 6, so that the open end of the reaction tank 5 can be sealed after the tank cover 6 is closed, thereby preventing leakage.
As an alternative embodiment, four cutting bars 14 are fixedly connected to the side wall of the plug bush 12, the four cutting bars 14 are uniformly distributed on the circumference with the axis of the plug bush 12 as a reference, four limiting slots 15 which are inserted with the cutting bars 14 are formed in the inner wall of the reaction tank 5, the length of each limiting slot 15 is the same as that of each cutting bar 14, the situation that the plug bush 12 rotates and shakes in the reaction tank 5 can be avoided, and structural integrity is achieved.
Referring to fig. 3, the turbulence ring 13 is arranged in a truncated cone shape, and small diameter ends of the turbulence rings 13 on two sides are arranged back to back, so that liquid can fall along an inclined plane under the action of gravity when the surface of the turbulence ring 13 is disturbed, and the situation that residues are left on the surface of the turbulence ring 13 is avoided.
Furthermore, the turbulence rings 13 are provided with turbulence holes 16, and the turbulence holes 16 formed on two adjacent turbulence rings 13 are staggered, so that the solution and the thinner sludge can fall from the turbulence rings 13, and the mixing effect is improved.
Specifically, both sides of the stirring plate 17 along the axis direction of the reaction tank 5 are designed in a circular truncated cone shape, and the small diameter ends of the circular truncated cones on both sides of the stirring plate 17 are arranged back to back, so that substances on the surface of the stirring plate can slide down along an inclined plane under the action of gravity when the stirring plate 17 moves, and the phenomenon of residue on the surface of the stirring plate 17 is avoided.
As an alternative implementation mode, the driving component 4 comprises a threaded rod 4a which is rotationally connected to the inner bottom of the reaction tank 5, a threaded hole 4c which is in threaded connection with the threaded rod 4a is formed in the stirring plate 17, a motor 4b which drives the threaded rod 4a to rotate positively and negatively is fixedly arranged on the bottom surface of the reaction tank 5, a limit slide rod 4d is fixedly connected to the inner bottom of the reaction tank 5, a slide rod hole 4e which is in sliding connection with the limit slide rod 4d is formed in the stirring plate 17, a stabilizing sleeve 19 which is sleeved with the optical shaft part at the end part of the threaded rod 4a is fixedly connected to the inner bottom of the tank cover 6, the threaded rod 4a is driven to rotate by controlling the motor 4b, and meanwhile, the stirring plate 17 in threaded connection with the threaded rod 4a moves on the threaded rod 4a, so that stirring and mixing effects are achieved.
By adopting the structure, when the stirring device is used, firstly, water and calcium hypochlorite powder are poured into the reaction tank 5, the tank cover 6 is closed through the bolt connecting piece 3, the stirring plate 17 is driven to reciprocate in the reaction tank 5 through the driving component 4, and meanwhile, a part of water is driven to move along with the stirring plate 17, when the stirring plate 17 moves between the two turbulence rings 13, the water falls from the gap and falls with the turbulence ring 13 below, and then the stirring device is repeatedly mixed;
after the mixing is finished, the reaction tank 5 is driven to rotate by the band-type brake motor 7, at the moment, the solution in the reaction tank falls onto the surface of the tank cover 6 under the action of gravity, the electromagnetic valve 11 is opened, the solution flows into the liquid storage tank 9, the electromagnetic valve 11 is closed, the reaction tank 5 is controlled to rotate reversely, the tank cover 6 is taken down after the liquid storage tank 9 is placed above, the sludge is poured into the reaction tank 5, the tank cover 6 is closed, the electromagnetic valve 11 is controlled to open, the solution flows into the reaction tank 5 to react with the sludge in a contact manner, at the moment, the stirring plate 17 can be driven to reciprocate again (the reaction tank 5 can be repeatedly rotated for a plurality of times when stirring the sludge is operated, so that a better mixing effect is achieved), the fermentation effect of the sludge is improved, and the gas generated by fermentation is conveyed into an external collecting container through the exhaust pipe 8.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (8)
1. An efficient anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge is characterized in that: the device comprises a bottom plate (1), vertical plates (2) are fixedly connected to two sides of the upper surface of the bottom plate (1), a reaction tank (5) is rotationally connected between the two vertical plates (2), one of the vertical plates (2) is fixedly provided with a band-type brake motor (7) for driving the reaction tank (5) to rotate positively and negatively, a tank cover (6) is arranged at an opening of the upper end of the reaction tank (5), the periphery of the tank cover (6) is detachably connected with the reaction tank (5) through a bolt connecting piece (3), one side of the tank cover (6) is communicated with an exhaust pipe (8), a liquid storage tank (9) is arranged above the tank cover (6), the liquid storage tank (9) is communicated with the inner wall of the tank cover (6) through a connecting pipe (10), and an electromagnetic valve (11) for controlling liquid circulation is fixedly arranged on the connecting pipe (10);
the inside of retort (5) can be dismantled and be connected with plug bush (12) rather than the inner wall contact, fixedly connected with a plurality of vortex ring (13) on the inner wall of this plug bush (12), the inside of retort (5) is equipped with stirring board (17), and is provided with on the inner bottom of retort (5) and is used for driving stirring board (17) along retort (5) axis direction reciprocating motion's drive assembly (4).
2. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: the utility model discloses a jar lid, including fixed connection otic placode (3 a) on cover (6) lateral wall in bolted connection spare (3), and four otic placode (3 a) use the axis of cover (6) as benchmark circumference evenly distributed, perforated (3 b) have been seted up on otic placode (3 a), peg graft in this perforated (3 b) have bolt (3 c), fixedly connected with on the lateral wall of retort (5) nut (3 d) with bolt (3 c) threaded connection.
3. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: the open end of the reaction tank (5) is fixedly connected with a sealing ring (18), and the open end of the tank cover (6) is provided with an embedded groove matched with the sealing ring (18).
4. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: four cutting (14) are fixedly connected to the side wall of the plug bush (12), the four cutting (14) are uniformly distributed on the circumference with the axis of the plug bush (12) as a reference, four limiting slots (15) which are inserted with the cutting (14) are formed in the inner wall of the reaction tank (5), and the lengths of the limiting slots (15) and the cutting (14) are the same.
5. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: the turbulence rings (13) are arranged in a truncated cone shape, and the small diameter ends of the turbulence rings (13) on two sides are arranged back to back.
6. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: a plurality of turbulence rings (13) are provided with turbulence holes (16), and the turbulence holes (16) arranged on two adjacent turbulence rings (13) are staggered.
7. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: both sides of the stirring plate (17) along the axial direction of the reaction tank (5) are designed in a truncated cone shape, and the small diameter ends of the truncated cones at both sides of the stirring plate (17) are arranged back to back.
8. The efficient anaerobic fermentation system based on pretreatment of residual sludge by calcium hypochlorite according to claim 1, wherein the efficient anaerobic fermentation system is characterized in that: the utility model discloses a drive assembly, including rotating threaded rod (4 a) of connecting on the inner bottom of retort (5), set up threaded hole (4 c) with threaded rod (4 a) threaded connection on stirring board (17), the bottom surface fixed mounting of retort (5) has motor (4 b) that drives threaded rod (4 a) forward, anti-rotation, the inner bottom fixedly connected with spacing slide bar (4 d) of retort (5), and set up slide bar hole (4 e) with spacing slide bar (4 d) sliding connection on stirring board (17), and fixedly connected with on the inner bottom of cover (6) and stable cover (19) of establishing of threaded rod (4 a) tip light shaft portion cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321710868.1U CN220183049U (en) | 2023-07-03 | 2023-07-03 | Efficient anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321710868.1U CN220183049U (en) | 2023-07-03 | 2023-07-03 | Efficient anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge |
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| Publication Number | Publication Date |
|---|---|
| CN220183049U true CN220183049U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321710868.1U Active CN220183049U (en) | 2023-07-03 | 2023-07-03 | Efficient anaerobic fermentation system based on calcium hypochlorite pretreatment of excess sludge |
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| Country | Link |
|---|---|
| CN (1) | CN220183049U (en) |
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2023
- 2023-07-03 CN CN202321710868.1U patent/CN220183049U/en active Active
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