CN116216925A - Agricultural waste and sewage cooperative treatment device - Google Patents

Agricultural waste and sewage cooperative treatment device Download PDF

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Publication number
CN116216925A
CN116216925A CN202211737552.1A CN202211737552A CN116216925A CN 116216925 A CN116216925 A CN 116216925A CN 202211737552 A CN202211737552 A CN 202211737552A CN 116216925 A CN116216925 A CN 116216925A
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China
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reaction zone
hydrolysis acidification
sewage
acidification reaction
mud
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Inventor
胥路鑫
钱福垚
朱军龙
尹志轩
刘猛
刘长青
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Qingdao University of Technology
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Qingdao University of Technology
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Priority to CN202211737552.1A priority Critical patent/CN116216925A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/286—Anaerobic digestion processes including two or more steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/35—Shredding, crushing or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/60—Biochemical treatment, e.g. by using enzymes
    • B09B3/65—Anaerobic treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/85—Paper; Wood; Fabrics, e.g. cloths
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Biochemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention relates to a agricultural waste and sewage cooperative treatment device, which comprises a device body, wherein the device body is internally provided with an upper space and a lower space, the upper space is provided with a hydrolysis acidification reaction zone and a methane production reaction zone which are communicated, a sludge reflux device is arranged between the hydrolysis acidification reaction zone and the methane production reaction zone, the lower space is provided with a solid-liquid separation device, and the outer side of the lower space is provided with a water reflux device; two non-closed partition boards are arranged between the hydrolysis acidification reaction zone and the methanogenesis reaction zone, the bottom of the hydrolysis acidification reaction zone is communicated with the top of the methanogenesis reaction zone, and a sludge reflux device is arranged on the partition board close to the methanogenesis reaction zone and comprises a movable board movably connected with the partition board through a lifting device; the bottom of the hydrolysis acidification reaction zone is provided with a mud bucket, and the lowest inclined point of the mud bucket faces towards the solid-liquid separation device. The two-stage partition of hydrolytic acidification and methanogenesis of anaerobic digestion is realized in the device, so that acidogenic bacteria and methanogenic bacteria grow under the respective optimal survival conditions, the respective activities are fully exerted, and the degradation efficiency is improved.

Description

Agricultural waste and sewage cooperative treatment device
Technical Field
The invention relates to the technical field of environmental protection facilities, in particular to a device for cooperatively treating agricultural wastes and sewage.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
When agricultural waste and sewage are treated by adopting the traditional anaerobic digestion technology, the hydrolysis and acidification rate is high due to the characteristics of certain matrixes (such as vegetable garbage) when the anaerobic digestion is carried out, a large amount of volatile organic acids are generated, the phenomenon of acid inhibition is easy to cause, and certain matrixes (such as straw and the like) contain a large amount of lignocellulose, so that the hydrolysis process is slow and the efficiency is low.
With respect to the characteristics and environmental restrictions of agricultural waste sites, part of the prior art enables the whole process of anaerobic digestion reaction to be carried out in one reactor, so that the acidification stage and the methanation stage cannot be carried out in the optimal environment, and gas yield is affected. Meanwhile, excessive stirring is easy to cause accumulation of a large amount of volatile acid in the acidification stage, and the subsequent methanation process is affected.
In addition, in the prior art, the central inner cylinder is arranged at the middle position of the reaction tank body, so that the central inner cylinder area of the reactor is a hydrolysis acidification reaction area, a methane generation area is formed between the outer walls of the central inner cylinder, and the integrated efficiency is improved, but due to the adoption of an integrated vertical design, the problems of scum crust and sand deposit and difficult discharge occur in operation, and the volume load capacity of the reactor is finally influenced, so that the treatment effect is influenced.
In addition, in some prior art, a circulation system is respectively arranged between the hydrolysis acidification reactor and the pretreatment device and between the hydrolysis acidification reactor and the methane-generating reactor to realize two-phase anaerobic digestion, and the process needs more circulation pumps and complex piping lines, is easily influenced by rural areas and other areas, and has certain limitation.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides the agricultural waste and sewage cooperative treatment device, which realizes the two-stage partition of hydrolytic acidification and methanogenesis of anaerobic digestion in the reaction device, so that acidogenic bacteria and methanogenic bacteria grow under the respective optimal survival conditions, the respective activities are fully exerted, and the degradation efficiency of solid organic matters is improved; meanwhile, the effective separation of methane, biogas slurry and biogas residues is realized, and the attached sludge reflux and water reflux functions can obviously reduce the sludge culture time during the three-phase separation period, thereby greatly improving the anaerobic digestion efficiency.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the first aspect of the invention provides an agricultural waste and sewage cooperative treatment device, which comprises a device body, wherein the device body is internally provided with an upper space and a lower space, the upper space is provided with a hydrolysis acidification reaction zone and a methanogenesis reaction zone which are communicated, a sludge reflux device is arranged between the hydrolysis acidification reaction zone and the methanogenesis reaction zone, the lower space is provided with a solid-liquid separation device, and the outer side of the lower space is provided with a water reflux device;
two non-closed partition boards are arranged between the hydrolysis acidification reaction zone and the methanogenesis reaction zone, the bottom of the hydrolysis acidification reaction zone is communicated with the top of the methanogenesis reaction zone, and a sludge reflux device is arranged on the partition board close to the methanogenesis reaction zone and comprises a movable board movably connected with the partition board through a lifting device; the bottom of the hydrolysis acidification reaction zone is provided with a mud bucket, and the lowest inclined point of the mud bucket faces towards the solid-liquid separation device.
The side wall of the hydrolysis acidification reaction zone is provided with a feed inlet and a backflow water inlet, and the top of the hydrolysis acidification reaction zone is provided with a first exhaust port and a pretreatment device; the bottom of the side wall of the hydrolysis acidification reaction zone is provided with a first water level sensor, and the bottom of the first partition plate is provided with a second water level sensor.
The top of the methane-generating reaction zone is provided with a second exhaust port, and the side wall of the lower layer space where the solid-liquid separation device is arranged is provided with a third exhaust port.
The baffle includes the first baffle that is close to hydrolytic acidification reaction zone and is close to the second baffle of methane production reaction zone, and first baffle top is connected with the internal surface of device body roof, and the second baffle bottom is linked together through first baffle bottom and second baffle top respectively through the fly leaf and the division board butt of mud reflux unit, hydrolytic acidification reaction zone bottom and methane production reaction zone top.
The solid-liquid separation device comprises a gate connected to the outlet of the mud bucket, a mud collecting cage is arranged in the space below the gate, holes are formed in the side wall and the bottom of the mud collecting cage, and a supporting base is arranged at the bottom of the mud collecting cage.
The bottom of the mud collecting cage is movably connected with the supporting base through a second sliding rail and a third sliding rail which are arranged in parallel, one side of the mud collecting cage, which is close to the device body, is movably connected with the wall surface of the device body through a first sliding rail, and the side wall of one side of the mud collecting cage, which is far away from the device body, is contacted with the bottom of the partition plate covered by the hydrolysis acidification reaction zone.
The water reflux device comprises a reflux water collecting tank positioned in the space below the sludge collecting cage, the side wall of the sludge collecting cage is connected with the inlet of the biogas slurry reflux pump through a pipeline, and the outlet of the biogas slurry reflux pump is connected to the hydrolysis acidification reaction zone through a pipeline.
The mud collecting cage and the backwater water collecting tank are provided with a sliding door at the joint, and the mud collecting cage can move to the outer side of the device body through the guidance of the first to third sliding rails under the opening state of the sliding door for cleaning the collected mud.
The methane-generating reaction zone is internally provided with a cage type stirring device, and the side wall is provided with a liquid outlet.
The cage stirring device comprises a rotating base connected to the output shaft of the motor, the lower bottom surface of the rotating base is connected with a plurality of groups of struts which are arranged in parallel, the other end of each strut is movably connected to a fourth sliding rail on the base, and each group of struts is movably connected with a fan blade.
Compared with the prior art, the above technical scheme has the following beneficial effects:
1. the two-stage partition of hydrolytic acidification and methanogenesis of anaerobic digestion is realized in the reaction device, so that acidogenic bacteria and methanogenic bacteria grow under the respective optimal survival conditions, the respective activities are fully exerted, the degradation efficiency of solid organic matters is improved, and high-concentration organic wastewater, wastewater and sludge which have high suspended matter concentration and contain refractory substances can be treated.
2. The effective separation of methane, methane liquid and methane slag is realized, and the attached sludge reflux and water reflux functions can obviously reduce the sludge culture time during the three-phase separation period, and greatly improve the anaerobic digestion efficiency.
3. The organic load of the acid producing phase is high, the impact resistance is strong, and acid accumulation caused by the impact load can not obviously influence the acid producing phase and can not influence the subsequent methane producing phase.
4. Because the acid producing phase belongs to two different reaction areas, the pretreatment of the acid producing phase can provide more proper matrixes for the methane producing phase, reduce the toxic action of corresponding toxic substances and heavy metal ions on methanogens, and enhance the running stability of the system.
5. Due to the combination of the sludge reflux device, the solid-liquid separation device and the water reflux device, the internal circulation of partial pollutants in the treatment process is realized, and the pollution treatment efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic cross-sectional view of an agricultural waste and sewage co-treatment apparatus according to one or more embodiments of the present invention;
FIG. 2 is a schematic cross-sectional view of A-A in a co-treatment plant for agricultural waste and sewage provided in accordance with one or more embodiments of the present invention;
FIG. 3 is a schematic cross-sectional view of B-B in a co-treatment plant for agricultural waste and sewage provided in accordance with one or more embodiments of the present invention;
FIG. 4 is a schematic cross-sectional structural view of C-C in a co-treatment plant for agricultural waste and sewage provided in accordance with one or more embodiments of the present invention;
in the figure: 1 feed inlet, 2 hydrolytic acidification reaction zone, 3 preprocessing device, 4 first gas outlet, 5 first baffle, 6 second gas outlet, 7 pillar, 8 motor, 9 rotation base, 10 methanogenesis reaction zone, 11 leakage fluid mouth, 12 third gas outlet, 13 back flow water collecting vat, 14 natural pond liquid reflux pump, 15 water reflux unit, 16 pipeline, 17 first slide rail, 18 second slide rail, 19 solid-liquid separation device, 20 gate, 21 mud bucket, 22 mud collection cage, 23 third slide rail, 24 support base, 25 second baffle, 26 lifting device, 27 sealing device, 28 mud reflux unit, 29 flabellum, 30 cage stirring device, 31 base, 32 fly leaf, 33 push-pull door, 34 fourth slide rail, 35 first water level sensor, 36 second water level sensor, 37 fifth slide rail, 38 back flow water inlet.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, the devices currently used for treating agricultural waste and sewage by anaerobic digestion have the following drawbacks:
(1) Optimal conditions cannot be provided for the acidification stage and the methanogenesis stage, and microbial activity cannot be utilized maximally.
(2) The biogas residue and the biogas slurry after anaerobic digestion cannot be fully utilized.
(3) The volume utilization rate is not high, and the volume loading capacity is low.
(4) The anaerobic digestion reaction has long residence time and larger reaction device volume.
Therefore, the following example provides a device for cooperatively treating agricultural wastes and sewage, which provides the most suitable environment for acidification production and methanation production, and maximally degrades the agricultural wastes; after three-phase separation, fully utilizing the biogas residues and biogas slurry after anaerobic digestion, wherein part of the biogas slurry can flow back, and the biogas residues can be used as fertilizer materials; the aim of efficiently degrading waste is fulfilled by the high organic load capacity of the two reaction areas; the volume of the reaction device is reduced while the anaerobic digestion reaction and the three-phase separation efficiency are ensured.
Embodiment one:
as shown in fig. 1-4, the agricultural waste and sewage cooperative treatment device comprises a device body with an upper space and a lower space, wherein the upper space is provided with a hydrolysis acidification reaction zone and a methane production reaction zone which are communicated, a sludge reflux device is arranged between the hydrolysis acidification reaction zone and the methane production reaction zone, the lower space is provided with a solid-liquid separation device, and the outer side of the lower space is provided with a water reflux device;
two non-closed partition boards are arranged between the hydrolysis acidification reaction zone and the methanogenesis reaction zone, the bottom of the hydrolysis acidification reaction zone is communicated with the top of the methanogenesis reaction zone, and a sludge reflux device is arranged on the partition board close to the methanogenesis reaction zone and comprises a movable board movably connected with the partition board through a lifting device; the bottom of the hydrolysis acidification reaction zone is provided with a mud bucket, and the lowest inclined point of the mud bucket faces towards the solid-liquid separation device.
Specific:
as shown in fig. 1, the apparatus includes: 1 feed inlet, 2 hydrolytic acidification reaction zone, 3 preprocessing device, 4 first gas outlet, 5 first baffle, 6 second gas outlet, 7 pillar, 8 motor, 9 rotation base, 10 methanogenesis reaction zone, 11 leakage fluid mouth, 12 third gas outlet, 13 back flow water collecting vat, 14 natural pond liquid reflux pump, 15 water reflux unit, 16 pipeline, 17 first slide rail, 18 second slide rail, 19 solid-liquid separation device, 20 gate, 21 mud bucket, 22 mud collection cage, 23 third slide rail, 24 support base, 25 second baffle, 26 lifting device, 27 sealing device, 28 mud reflux unit, 29 flabellum, 30 cage stirring device, 31 base, 32 fly leaf, 33 push-pull door, 34 fourth slide rail, 35 first water level sensor, 36 second water level sensor, 37 fifth slide rail, 38 back flow water inlet.
The device is a rectangle container which is approximately sealed, and is divided into an upper layer and a lower layer, wherein the upper layer space is provided with a hydrolysis acidification reaction zone and a methane production reaction zone, a sludge reflux device is arranged between the hydrolysis acidification reaction zone and the methane production reaction zone, the lower layer space is provided with a solid-liquid separation device, the outer side of the lower layer space is provided with a water reflux device, and the two side spaces are separated by a partition plate.
The hydrolysis acidification reaction zone is characterized in that a feed inlet is arranged above the side wall of the hydrolysis acidification reaction zone, a backflow water inlet is arranged below the side wall, a first exhaust port and a pretreatment device are arranged at the top of the hydrolysis acidification reaction zone, and a mud bucket and a first water level sensor are arranged at the bottom of the hydrolysis acidification reaction zone. Two non-sealing partition boards are arranged between the hydrolytic acidification reaction zone and the methanogenesis reaction zone, and the bottom of the hydrolytic acidification reaction zone is communicated with the top of the methanogenesis reaction zone.
The height of the bottom of the first partition plate is equal to 8% of the height of the top of the second partition plate, and a second water level sensor is arranged at the bottom of the first partition plate.
The sludge reflux device is arranged on the second partition plate and consists of a movable plate, a lifting device and a sealing device.
The top of the methane-generating reaction zone is provided with a motor and a second exhaust port, the side wall is provided with a liquid outlet, the middle part is also provided with a cage stirring device, and the bottom inclination angle is designed to be 3 degrees.
In this embodiment, the bottom inclination angle is designed to be 3 °, specifically: the bottom of the methanogenic reaction zone is inclined towards the mud bucket by an angle of 3 degrees.
The cage type stirring device consists of a base, a support, fan blades and a rotating base, wherein the base is connected with the support through a fourth sliding rail, and the support is movably connected with the fan blades through a fifth sliding rail.
The fan blade rotating slide rail on the cage type stirring device can be designed into a spiral fan blade rotating slide rail around the support in addition to the fifth slide rail shown in fig. 1 and 4, so that the fan blade can rotate up and down in the operation of the cage type stirring device except horizontal rotation, the mixing effect of the fermented product and anaerobic digestion bacteria is improved, and the specific structural type depends on the actual requirements of waste and sewage.
The number of the supporting posts on the cage type stirring device can be adjusted, and the number of the fan blades on the supporting posts can be changed.
The solid-liquid separation device comprises a gate, a mud collecting cage, first to third sliding rails and a sliding door, and is specifically:
the gate of the solid-liquid separation device is positioned below the mud bucket in the hydrolysis acidification reaction zone, and a mud collecting cage is arranged below the gate. The side wall and the bottom of the mud collecting cage are provided with small holes, a supporting base is arranged below the mud collecting cage, the bottom of the mud collecting cage is connected with the supporting base through a second sliding rail and a third sliding rail, one side of the mud collecting cage, which is close to the reaction device, is connected with the wall surface of the reaction device through a first sliding rail, the side wall of one side of the mud collecting cage, which is not close to the reaction device, is contacted with the bottom of the hydrolysis acidification reaction zone tank, and a sliding door is arranged at the joint of the mud collecting cage and the side wall of the backflow water collecting tank.
The water reflux device consists of a pipeline, a biogas slurry reflux pump, an exhaust port and a reflux water collecting tank, and is specifically: the return water collecting pool is positioned in the space below the sludge collecting cage, the side wall of the return water collecting pool is provided with an exhaust port and is connected with an inlet of the biogas slurry return pump through a pipeline, and an outlet of the biogas slurry return pump is connected to the hydrolysis acidification reaction zone through a pipeline.
The volume ratio of the hydrolysis acidification reaction zone to the methanogenesis reaction zone to the reflux water collecting tank to the sludge collecting cage is 2:4:8:1.
the mud bucket at the bottom of the hydrolysis acidification reaction zone can adjust the quantity and the distribution mode according to the concentration of the to-be-treated objects.
The mud collecting cage is made of stainless steel, different wall apertures and aperture intervals are set according to different feeding properties, the wall aperture range is 3-10mm, the wall aperture longitudinal interval range is 5-10mm, and the wall aperture transverse interval range is 5-10mm.
The feeding mode is continuous feeding, wherein the solid-liquid separation mode is intermittent separation, different periods are set according to the feeding property, and the solid-liquid separation period ranges from 30 days to 40 days.
The working flow is as follows:
pretreatment: when sewage and excrement enter the agricultural waste and sewage cooperative treatment device through the feed inlet, the agricultural waste such as straw and the rural solid waste are crushed into granular solid waste with the particle size of 1-3mm in the pretreatment device above the device and then enter the agricultural waste and sewage cooperative treatment device.
Hydrolysis acidification stage: the reactants entering the device firstly carry out hydrolysis acidification reaction in a hydrolysis acidification reaction tank zone, wherein the contained solids are deposited in a mud bucket under the action of gravity, and sewage flows into a methane-producing reaction zone under the overflow action after the hydrolysis acidification reaction with the hydraulic retention time of 4 days. And water collected in the return water collection tank is pumped to reduce the concentration in the hydrolytic acidification reaction zone in order to prevent excessive pollutant content. Biogas generated in the hydrolytic acidification stage is discharged through the first exhaust port.
Methane production stage: the rotating base of the cage stirring device starts to rotate, the support column starts to rotate under the drive of the rotating base, and the fan blades on the support column start to rotate due to uneven stress at two ends. The sewage entering the methanogenesis reaction zone is subjected to methanogenesis reaction for 8 days under the action of the cage stirring device, and sludge which is not separated is deposited at the junction of the movable plate and the bottom of the tank under the influence of the inclination angle. Biogas is led out through the second exhaust port, and biogas slurry flows out through the liquid outlet when the hydraulic retention time reaches 8 days.
And a solid-liquid separation stage: after the agricultural waste and sewage cooperative treatment device operates for one month, periodic solid-liquid separation is started. The gate below the mud bucket is opened, substances in the hydrolysis acidification reaction zone fall into the mud collecting cage under the action of gravity, solids are collected in the mud collecting cage, and liquid enters the reflux water collecting tank through small holes in the mud collecting cage. The mud collecting cage can be pulled out by the sliding door under the action of the sliding rail for a user to take.
And (3) a sludge backflow stage: after the first water level sensor at the bottom of the hydrolysis acidification reaction zone has no water level information, the solid-liquid separation stage is finished, the gate below the mud bucket is closed, the movable plate is pulled up under the action of the lifting device, and the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone so as to be separated out in the next round of solid-liquid separation, and after the second water level sensor at the bottom of the first partition plate senses, the movable plate is reset, and the sludge return is finished. Meanwhile, part of water is returned along with the sludge so as to provide anaerobic digestion bacteria and improve the efficiency of the hydrolysis acidification reaction stage.
Water reflux stage: the liquid entering the reflux water collecting tank can be pumped into the reflux water inlet under the action of the biogas slurry reflux pump so as to reduce the concentration of pollutants in the hydrolytic acidification reaction zone. The gas generated in the backwater water collecting tank is discharged through a third gas outlet on the side wall thereof.
Test example 1:
the wheat straw and the cow dung are put into an agricultural waste and sewage cooperative treatment device according to the TS ratio of 1:2 to react, and sewage is mixed to lead the total TS of the entered ferment to be 6 percent. After the wheat straw entering the pretreatment device is crushed into particles with the particle size of 3mm, the particles are mixed with cow dung and sewage to carry out hydrolytic acidification in a hydrolytic acidification area for 4 days. The fermented product after hydrolysis and acidification reaction flows into a methanogenesis reaction zone under the overflow effect, and the methanogenesis reaction is carried out for 8 days under the action of a cage stirring device with the rotating speed of 20-40 r/min. After the agricultural waste and sewage cooperative treatment device operates for one month, the periodic solid-liquid separation is started. The mud collecting cage with the aperture of the side wall of 7mm and the longitudinal spacing of the holes on the wall of 9mm and the transverse spacing of the holes on the wall of 9mm is used for solid-liquid separation. After the solid-liquid separation is finished, the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone, and biogas slurry accounting for 8% of the volume of the hydrolysis acidification reaction zone along with the sludge return flow enters the hydrolysis acidification reaction zone.
Test example 2:
the reed straw and chicken manure are put into an agricultural waste and sewage cooperative treatment device for reaction according to the TS ratio of 1:2, and sewage is mixed to ensure that the total TS of the entered ferment is 5%. The reed straw entering the pretreatment device is crushed into particles with the particle diameter of about 3mm, and then is mixed with chicken manure and sewage to carry out hydrolytic acidification reaction in a hydrolytic acidification area for 4 days. The fermented product after hydrolysis and acidification reaction flows into a methanogenesis reaction zone under the overflow effect, and the methanogenesis reaction is carried out for 8 days under the action of a cage stirring device with the rotating speed of 20-40 r/min. After the agricultural waste and sewage cooperative treatment device operates for one month, the periodic solid-liquid separation is started. The mud collecting cage with the aperture of the side wall of 8mm and the longitudinal spacing of holes on the wall of 10mm and the transverse spacing of holes on the wall of 10mm is used for solid-liquid separation. After the solid-liquid separation is finished, the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone, and biogas slurry accounting for 8% of the volume of the hydrolysis acidification reaction zone along with the sludge return flow enters the hydrolysis acidification reaction zone.
Test example 3:
putting kitchen waste and corn straw into an agricultural waste and sewage cooperative treatment device according to the TS ratio of 1:2 for reaction, and mixing sewage to ensure that the total TS of the entering fermentation product is 4%. After the kitchen waste and the corn stalks entering the pretreatment device are crushed into particles with the particle size of about 3mm, the particles are mixed with sewage and are subjected to hydrolysis acidification reaction in a hydrolysis acidification area for 4 days. The fermented product after hydrolysis and acidification reaction flows into a methanogenesis reaction zone under the overflow effect, and the methanogenesis reaction is carried out for 8 days under the action of a cage stirring device with the rotating speed of 20-40 r/min. After the agricultural waste and sewage cooperative treatment device operates for one month, the periodic solid-liquid separation is started. The mud collecting cage with the aperture of the side wall of 9mm, the longitudinal spacing of holes on the wall of 10mm and the transverse spacing of holes on the wall of 10mm is used for solid-liquid separation. After the solid-liquid separation is finished, the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone, and biogas slurry accounting for 8% of the volume of the hydrolysis acidification reaction zone along with the sludge return flow enters the hydrolysis acidification reaction zone.
Test example 4:
cow dung and tomato stems and leaves are put into an agricultural waste and sewage cooperative treatment device according to the TS ratio of 3:1 to react, and sewage is mixed to ensure that the total TS of the entered fermentation product is 12 percent. The tomato stems and leaves entering the pretreatment device are crushed into particles with the particle size of about 1mm, and then are mixed with sewage and cow dung to carry out hydrolytic acidification in a hydrolytic acidification area for 4 days. The fermented product after hydrolysis and acidification reaction flows into a methanogenesis reaction zone under the overflow effect, and the methanogenesis reaction is carried out for 8 days under the action of a cage stirring device with the rotating speed of 20-40 r/min. After the agricultural waste and sewage cooperative treatment device operates for one month, the periodic solid-liquid separation is started. The mud collecting cage with the aperture of the side wall of 6mm, the longitudinal spacing of the holes on the wall of 6mm and the transverse spacing of the holes on the wall of 6mm is used for solid-liquid separation. After the solid-liquid separation is finished, the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone, and biogas slurry accounting for 8% of the volume of the hydrolysis acidification reaction zone along with the sludge return flow enters the hydrolysis acidification reaction zone.
Test example 5:
organic garbage, corn straw and cow dung are put into an agricultural waste and sewage cooperative treatment device for reaction according to the TS ratio of 1:1:1, and sewage is mixed to ensure that the total TS of the entered fermentation product is 13%. The organic garbage and corn stalk entering the pretreatment device are crushed into particles with the particle diameter of about 1mm, and then are mixed with sewage and cow dung to carry out hydrolytic acidification reaction for 4 days in a hydrolytic acidification area. The fermented product after hydrolysis and acidification reaction flows into a methanogenesis reaction zone under the overflow effect, and the methanogenesis reaction is carried out for 8 days under the action of a cage stirring device with the rotating speed of 20-40 r/min. After the agricultural waste and sewage cooperative treatment device operates for one month, the periodic solid-liquid separation is started. The mud collecting cage with the aperture of the side wall of 6mm, the longitudinal spacing of the holes on the wall of 5mm and the transverse spacing of the holes on the wall of 5mm is used for solid-liquid separation. After the solid-liquid separation is finished, the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone, and biogas slurry accounting for 8% of the volume of the hydrolysis acidification reaction zone along with the sludge return flow enters the hydrolysis acidification reaction zone.
Test example 6:
the agricultural waste and sewage are put into a cooperative treatment device for reaction, and sewage is mixed to make the total TS of the entered ferment be 13%. The agricultural tail vegetables entering the pretreatment device are crushed into particles with the particle size of about 1mm, and then are mixed with sewage to carry out hydrolytic acidification reaction in a hydrolytic acidification area for 4 days. The fermented product after hydrolysis and acidification reaction flows into a methanogenesis reaction zone under the overflow effect, and the methanogenesis reaction is carried out for 8 days under the action of a cage stirring device with the rotating speed of 20-40 r/min. After the agricultural waste and sewage cooperative treatment device operates for one month, the periodic solid-liquid separation is started. The mud collecting cage with the aperture of the side wall of 6mm, the longitudinal spacing of the holes on the wall of 5mm and the transverse spacing of the holes on the wall of 5mm is used for solid-liquid separation. After the solid-liquid separation is finished, the sludge deposited in the methanogenesis reaction zone is returned to the hydrolysis acidification reaction zone, and biogas slurry accounting for 8% of the volume of the hydrolysis acidification reaction zone along with the sludge return flow enters the hydrolysis acidification reaction zone.
The device can treat high-concentration organic wastewater, industrial wastewater and sludge which have high suspended solids concentration and contain refractory substances. The organic load of the acid producing phase is high, the impact resistance is strong, and acid accumulation caused by the impact load can not obviously influence the acid producing phase and can not influence the subsequent methane producing phase. Because the acid producing phase belongs to two different reaction areas, the pretreatment of the acid producing phase can provide more proper matrixes for the methane producing phase, reduce the toxic action of corresponding toxic substances and heavy metal ions on methanogens, and enhance the running stability of the system. Due to the combination of the sludge reflux device, the solid-liquid separation device and the water reflux device, the internal circulation of partial pollutants in the treatment process is realized, and the pollution treatment efficiency is improved.
The anaerobic digestion reaction is carried out in a partitioned mode, and simultaneously the anaerobic digestion reaction is organically combined with the solid-liquid separation device, so that a three-phase separation function is realized.
The control parameters of the two reaction systems of the acid producing phase and the methane producing phase can be independently designed to create the optimal environment, and proper strains can be added according to the situation to achieve the purpose of strengthening the reaction.
The sludge reflux device and the solid-liquid separation device and the water reflux device can be combined to realize the recycling of biogas residues and biogas liquid.
The cage type stirring device in the methanogenesis reaction zone can fully mix methanogenesis bacteria with the to-be-fermented substances, so that the fermentation efficiency is improved.
The water reflux device and the solid-liquid separation device are organically combined, so that the pollutant treatment effect is ensured, and the pollution treatment efficiency is improved.
The anaerobic digestion device realizes miniaturization of the device and ensures efficiency by organically combining the functions of two-stage anaerobic digestion, three-phase separation, sludge reflux and the like.
The anaerobic digestion reaction of a plurality of fermentation matrixes in the same reaction device is realized.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An agricultural waste and sewage cooperative treatment device, which is characterized in that: the device comprises a device body with an upper space and a lower space, wherein the upper space is provided with a hydrolysis acidification reaction zone and a methane production reaction zone which are communicated, a sludge reflux device is arranged between the hydrolysis acidification reaction zone and the methane production reaction zone, the lower space is provided with a solid-liquid separation device, and the outer side of the lower space is provided with a water reflux device;
two non-closed partition boards are arranged between the hydrolysis acidification reaction zone and the methanogenesis reaction zone, the bottom of the hydrolysis acidification reaction zone is communicated with the top of the methanogenesis reaction zone, and a sludge reflux device is arranged on the partition board close to the methanogenesis reaction zone and comprises a movable board movably connected with the partition board through a lifting device; the bottom of the hydrolysis acidification reaction zone is provided with a mud bucket, and the lowest inclined point of the mud bucket faces towards the solid-liquid separation device.
2. An agricultural waste and sewage co-treatment apparatus according to claim 1, wherein: the side wall of the hydrolysis acidification reaction zone is provided with a feed inlet and a backflow water inlet, and the top of the hydrolysis acidification reaction zone is provided with a first exhaust port and a pretreatment device; the bottom of the side wall of the hydrolysis acidification reaction zone is provided with a first water level sensor, and the bottom of the first partition plate is provided with a second water level sensor.
3. An agricultural waste and sewage co-treatment apparatus according to claim 1, wherein: the top of the methane-generating reaction zone is provided with a second exhaust port, and the side wall of the lower layer space where the solid-liquid separation device is arranged is provided with a third exhaust port.
4. An agricultural waste and sewage co-treatment apparatus according to claim 1, wherein: the baffle includes the first baffle that is close to hydrolytic acidification reaction zone and is close to the second baffle of methane production reaction zone, and first baffle top is connected with the internal surface of device body roof, and the fly leaf and the division board butt of second baffle bottom through mud reflux unit, hydrolytic acidification reaction zone bottom and methane production reaction zone top are linked together through first baffle bottom and second baffle top respectively.
5. An agricultural waste and sewage co-treatment apparatus according to claim 1, wherein: the solid-liquid separation device comprises a gate connected to the outlet of the mud bucket, a mud collecting cage is arranged in the space below the gate, holes are formed in the side wall and the bottom of the mud collecting cage, and a supporting base is arranged at the bottom of the mud collecting cage.
6. An agricultural waste and sewage co-treatment apparatus according to claim 5, wherein: the bottom of the mud collecting cage is movably connected with the supporting base through a second sliding rail and a third sliding rail which are arranged in parallel, one side of the mud collecting cage, which is close to the device body, is movably connected with the wall surface of the device body through a first sliding rail, and the side wall of one side of the mud collecting cage, which is far away from the device body, is contacted with the bottom of the partition plate covered by the hydrolysis acidification reaction zone.
7. An agricultural waste and sewage co-treatment apparatus according to claim 1, wherein: the water reflux device comprises a reflux water collecting tank located in the space below the sludge collecting cage, the side wall of the sludge collecting cage is connected with an inlet of a biogas slurry reflux pump through a pipeline, and an outlet of the biogas slurry reflux pump is connected to the hydrolysis acidification reaction zone through a pipeline.
8. An agricultural waste and sewage co-treatment apparatus according to claim 7, wherein: the mud collecting cage is provided with a sliding door at the joint of the mud collecting cage and the side wall of the backwater water collecting tank, and the mud collecting cage can move to the outer side of the device body through the guidance of the first to third sliding rails under the opening state of the sliding door, so as to clean the collected mud.
9. An agricultural waste and sewage co-treatment apparatus according to claim 1, wherein: the methane-generating reaction zone is internally provided with a cage type stirring device, and the side wall of the methane-generating reaction zone is provided with a liquid outlet.
10. An agricultural waste and sewage co-treatment apparatus according to claim 9, wherein: the cage stirring device comprises a rotating base connected to an output shaft of the motor, wherein the lower bottom surface of the rotating base is connected with a plurality of groups of struts which are arranged in parallel, the other ends of the struts are movably connected to a fourth sliding rail on the base, and each group of struts are movably connected with fan blades.
CN202211737552.1A 2022-12-30 2022-12-30 Agricultural waste and sewage cooperative treatment device Pending CN116216925A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120772A1 (en) * 1983-03-24 1984-10-03 Bertin & Cie Installations and processes for the biological purification and production of combustible gases by anaerobic two-phase fermentation
CA2401153A1 (en) * 2002-09-13 2004-03-13 Abdelaziz Houmam Methanogen fermentation process
CN101805753A (en) * 2010-02-03 2010-08-18 中国科学院广州能源研究所 Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes
KR20110129210A (en) * 2010-05-25 2011-12-01 권혁성 Organic Waste Disposal System with Improved Methane Yield and Method
CN104130942A (en) * 2014-07-21 2014-11-05 哈尔滨工业大学宜兴环保研究院 Agricultural organic waste anaerobic fermentation recovery biogas reaction apparatus and recovery method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120772A1 (en) * 1983-03-24 1984-10-03 Bertin & Cie Installations and processes for the biological purification and production of combustible gases by anaerobic two-phase fermentation
CA2401153A1 (en) * 2002-09-13 2004-03-13 Abdelaziz Houmam Methanogen fermentation process
CN101805753A (en) * 2010-02-03 2010-08-18 中国科学院广州能源研究所 Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes
KR20110129210A (en) * 2010-05-25 2011-12-01 권혁성 Organic Waste Disposal System with Improved Methane Yield and Method
CN104130942A (en) * 2014-07-21 2014-11-05 哈尔滨工业大学宜兴环保研究院 Agricultural organic waste anaerobic fermentation recovery biogas reaction apparatus and recovery method thereof

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