Anaerobic fermentation reaction system

Abstract

The invention discloses an anaerobic fermentation reaction system, which comprises: a biogas generation device, which comprises a fermentation tank body used for carrying out an anaerobic fermentation reaction on breeding wastewater to generate biogas and a tank edge arranged at the top of the fermentation tank body; the biogas collecting device comprises a first separator arranged in the fermentation tank body and a second separator connected with the top of the first separator; wherein the second separator is arranged at the top edge of the tank edge and comprises an observation mirror capable of observing the anaerobic fermentation reaction and a control valve capable of regulating and controlling the anaerobic fermentation reaction. The anaerobic fermentation reaction system provided by the invention can ensure that the anaerobic fermentation reaction in the fermentation tank body can still be normally carried out in winter and other external low-temperature conditions, and has the advantages of good safety, simplicity and convenience in operation, low cost and the like.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of anaerobic fermentation of aquaculture wastewater. More specifically, the present application relates to an anaerobic fermentation reaction system. Background Art

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The descriptions herein may include concepts that may be explored, but not necessarily concepts that have been previously thought of or explored. Therefore, unless otherwise noted herein, the content described in this section is not prior art with respect to the specification and claims of this application, and is not admitted to be prior art by inclusion in this section.

[0003] With the development of aquaculture, intensive aquaculture has gradually become the mainstream trend due to its high production efficiency and convenient unified management. However, intensive farms also produce a large amount of aquaculture wastewater containing feces and urine. Since aquaculture wastewater is rich in a large number of pathogens and high-concentration organic matter, if untreated aquaculture wastewater is directly discharged into the water body, it will cause serious pollution to the water body, thereby seriously damaging the ecological balance of the water body and even leading to the spread of epidemics.

[0004] Aquaculture wastewater is a "three-high" wastewater with high organic matter concentration, high nitrogen and phosphorus content, and high number of harmful microorganisms. Therefore, anaerobic fermentation technology is currently commonly used to decompose organic matter in aquaculture wastewater. However, anaerobic fermentation reactions are greatly affected by temperature, especially under low temperature conditions in winter. The reduced activity of microorganisms and insufficient biogas production will cause the anaerobic fermentation reaction rate to slow down or even stop. In view of this, it is urgent to provide an anaerobic fermentation reaction system that can perform anaerobic fermentation reactions normally under low temperature conditions. Summary of the invention

[0005] In order to solve one or more technical problems mentioned above, the present application provides an anaerobic fermentation reaction system. The anaerobic fermentation reaction system includes: a biogas generating device, which includes a fermentation tank body for causing aquaculture wastewater to undergo anaerobic fermentation reaction to generate biogas and a tank edge arranged on the top of the fermentation tank body; and a biogas collecting device, which includes: a first separator, which is arranged in the fermentation tank body and is used to collect biogas and liquid in the aquaculture wastewater and discharge the solid in the aquaculture wastewater to the bottom of the fermentation tank body; a second separator, which is connected to the top of the first separator and is used to collect biogas in the aquaculture wastewater and discharge the liquid in the aquaculture wastewater to the bottom of the fermentation tank body; wherein the second separator is arranged at the top edge of the tank edge and includes an observation mirror capable of observing the anaerobic fermentation reaction and a control valve capable of regulating the anaerobic fermentation reaction.

[0006] In an optional solution, the biogas collection device further comprises a riser pipe connecting the first separator and the second separator, and the riser pipe extends obliquely from the top edge of the tank edge toward the central area of ​​the fermentation tank body.

[0007] In an optional solution, the second separator also includes a separator shell, which has a feed port for receiving biogas and liquid from the first separator, a return port for discharging liquid into the fermentation tank body, and an exhaust port for releasing biogas; the observation mirror is arranged on the separator shell.

[0008] In an optional solution, the observation mirror includes a first eyepiece and a second eyepiece which are relatively arranged on the separator housing, and the first eyepiece and / or the second eyepiece are used to refract and / or reflect the light from the fermentation tank body.

[0009] In an optional solution, there are multiple biogas collection devices, and the second separator of each biogas collection device also includes a control valve for controlling the release rate of the biogas. The control valve is arranged at the feed port of the separator shell and is located outside the separator shell.

[0010] In an optional scheme, the fermentation tank body includes a bottom wall, a sloping wall connected to the bottom wall, and a reaction space defined by the bottom wall and the sloping wall. The surfaces of the bottom wall and the sloping wall are both provided with a multi-layer structure, and the multi-layer structure of the bottom wall and / or the sloping wall includes at least one insulation layer.

[0011] In an optional scheme, the anaerobic fermentation reaction system also includes a mud discharge pipe, whose inlet is arranged at the bottom of the fermentation tank body and the outlet is arranged outside the fermentation tank body, and the mud discharge pipe is provided with a plurality of mud discharge structures evenly spaced along its circumference, each of the mud discharge structures includes a plurality of mud discharge holes spaced along the axial direction of the mud discharge pipe, and the mud discharge holes of two adjacent mud discharge structures are staggered.

[0012] In an optional solution, the biogas collection device also includes a return pipe connected to the second separator and used to discharge liquid into the fermentation tank body, the inlet of the return pipe is connected to the return port of the separator shell, and the outlet of the return pipe is arranged at the bottom of the fermentation tank body.

[0013] In an optional scheme, the anaerobic fermentation reaction system also includes a feed pipe connected to the bottom of the fermentation tank body and a pump body connected to the feed pipe, the outlet of the feed pipe is arranged in the fermentation tank body, and the inlet thereof is arranged outside the fermentation tank body, and the pump body is used to transport the aquaculture wastewater into the fermentation tank body.

[0014] In an optional scheme, the anaerobic fermentation reaction system also includes a water distribution pipe connected to the return pipe, the water distribution pipe is connected to the outlet of the return pipe, the water distribution pipe is evenly distributed at the bottom of the fermentation tank body, and includes a plurality of water distribution ports for discharging the liquid separated from the aquaculture wastewater by the first separator.

[0015] Through the anaerobic fermentation reaction system provided above, it can be understood by those skilled in the art that the anaerobic fermentation reaction system is provided with an observation mirror capable of observing the anaerobic fermentation reaction and a control valve capable of regulating the anaerobic fermentation reaction at the top edge of the tank, so that the staff can monitor the anaerobic fermentation reaction process in real time through the observation mirror. Furthermore, when it is observed that the anaerobic fermentation reaction is inhibited due to low temperature, the anaerobic fermentation reaction can be regulated in time through the control valve, thereby ensuring that the anaerobic fermentation reaction in the fermentation tank is carried out normally under low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 An anaerobic fermentation reaction system according to an embodiment of the present invention is shown;

[0018] Figure 2 A biogas generating device according to an embodiment of the present invention is shown;

[0019] Figure 3 A biogas collection device according to an embodiment of the present invention is shown;

[0020] Figure 4 A second separator according to an embodiment of the present invention is shown;

[0021] Figure 5 The inclined wall and multi-layer structure of the embodiment of the present invention are shown;

[0022] Figure 6 The sludge discharge pipe according to the embodiment of the present invention is shown.

[0023] Description of reference numerals:

[0024] 100. Anaerobic fermentation reaction system; 1. Biogas generating device; 11. Fermentation tank body; 11a. Sloping wall; 11b. Bottom wall; 11c. Reaction space; 11d. Multi-layer structure; 12. Tank edge; 2. Biogas collecting device; 21. First separator; 211. Gas collecting pipe; 22. Second separator; 221. Separator shell; 222. First eyepiece; 223. Control valve; 224. Top cover; 22a. Feed inlet; 22b. Return inlet; 22c. Exhaust port; 23. Riser; 24. Return pipe; 25. Water distribution pipe; 3. Feed pipe; 31. Pump body; 4. Mud discharge pipe; 41. Mud discharge structure; 5. Exhaust pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] In the treatment of aquaculture wastewater, anaerobic fermentation reaction usually refers to the process of decomposing organic matter and producing biogas under anaerobic conditions by the joint action of multiple (anaerobic or facultative) microorganisms. Anaerobic fermentation reaction can effectively remove a large amount of organic matter in aquaculture wastewater at a low operating cost, and can kill infectious bacteria. It can not only achieve harmless treatment of livestock and poultry manure and sewage, but also recycle biogas and organic fertilizer, with good environmental and economic benefits.

[0027] The specific implementation of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Figure 1 FIG. 1 shows an anaerobic fermentation reaction system 100 according to an embodiment of the present invention. Figure 1 As shown, the anaerobic fermentation reaction system 100 includes a biogas generating device 1 and a biogas collecting device 2 (see Figure 3 ). The biogas generating device 1 includes a fermentation tank body 11 for causing aquaculture wastewater to undergo anaerobic fermentation reaction to generate biogas, and a tank edge 12 arranged on the top of the fermentation tank body 11. The biogas collecting device 2 includes a first separator 21 arranged in the fermentation tank body 11, and a second separator 22 arranged at the top edge of the tank edge 12 and connected to the top of the first separator 21. Among them, the first separator 21 is used to collect biogas and liquid in the aquaculture wastewater and discharge the solids in the aquaculture wastewater into the fermentation tank body 11, and the second separator 22 is used to collect biogas in the aquaculture wastewater and discharge the liquid in the aquaculture wastewater into the fermentation tank body 11. In addition, the second separator 22 also includes an observation mirror capable of observing the anaerobic fermentation reaction and a control valve 223 capable of regulating the anaerobic fermentation reaction (see for details). Figure 4 ).

[0029] To facilitate those skilled in the art to better understand the embodiments of the present invention, the operating principle of the anaerobic fermentation reaction in this embodiment is briefly introduced here: aquaculture wastewater containing a large amount of organic matter is mixed with fermentation materials (such as activated sludge, which includes a microbial community participating in the fermentation reaction and its metabolites and adsorbents, etc.) and an anaerobic fermentation reaction is carried out, so that the organic matter in the aquaculture wastewater is degraded and biogas is produced.

[0030] In this embodiment, as the amount of aquaculture wastewater at the bottom of the fermentation tank body 11 increases, the aquaculture wastewater is fully mixed with the fermentation material, and the organic matter and microorganisms undergo anaerobic fermentation during the mixing process and produce a large amount of biogas. After the aquaculture wastewater and the fermentation material undergo fermentation, the resulting mixture contains solids (including feces, feed residues, and activated sludge, etc.), liquids (aquaculture wastewater containing soluble organic matter and soluble inorganic matter, etc.), and gases (mainly biogas produced by the fermentation reaction, etc.). As the anaerobic fermentation reaction proceeds and the biogas is continuously generated, the mixture at the bottom of the fermentation tank body 11 is entrained by bubbles formed by biogas, etc. and lifted upward, and the mixture first enters the first separator 21, which separates the solids, liquids, and biogas in the mixture, and discharges the solids and / or liquids to the bottom of the fermentation tank body 11, so that the solids and / or liquids can continue to undergo anaerobic fermentation after mixing with the mixture at the bottom of the fermentation tank body 11. Then, the remaining liquid and biogas in the mixture continue to rise and enter the second processor 22, which separates the liquid and biogas in the mixture and discharges the liquid to the bottom of the fermentation tank body 11 so that it can mix with the mixture at the bottom of the fermentation tank body 11 and continue the anaerobic fermentation reaction.

[0031] Figure 2 The biogas generating device 1 of the embodiment of the present invention is shown. It can be understood that Figure 2 The structure shown in is an implementation of the biogas generating device 1, which is exemplary and not restrictive. Therefore, the description of the biogas generating device 1 above is also applicable to the description of the biogas generating device 1 below. Figure 2 Description. Figure 3 The biogas collection device 2 of the embodiment of the present invention is shown. It can be understood that Figure 3 The structure shown in the figure is an implementation of the biogas collection device 2, which is exemplary and not restrictive. Therefore, the description of the biogas collection device 2 above is also applicable to the description of the biogas collection device 2 below. Figure 3 Description.

[0032] like Figure 2As shown, in this embodiment, the fermentation tank body 11 is arranged underground, and it can use the heat insulation of the deep pit ground temperature and the thick soil insulation to heat the aquaculture wastewater and microorganisms in the fermentation tank body 11 to prevent the anaerobic fermentation reaction from stopping when the external environment temperature is too low. For example, the anaerobic fermentation reaction system 100 provided in this embodiment can achieve that in the winter in the central region (average temperature -13°C to 4°C), the water temperature in the fermentation tank body 11 is still not less than 15°C to ensure that the anaerobic fermentation reaction will not stop. Optionally, the port area of ​​the fermentation tank body 11 gradually increases from the bottom to the top. For example, the depth of the fermentation tank body 11 can be selected from 16 meters to 24 meters; the bottom port length of the fermentation tank body 11 is 5 meters and the width is 2 meters; the top port length of the fermentation tank body 11 is 7 meters and the width is 5 meters.

[0033] like Figure 1 and Figure 3 As shown, the first separator 21 arranged in the fermentation tank body 11 can separate the solid, liquid and biogas in the aquaculture wastewater during the anaerobic fermentation reaction, so as to collect the biogas and liquid in the aquaculture wastewater and discharge the solids in the aquaculture wastewater into the fermentation tank body 11. Specifically, in the present embodiment, the first separator 21 is selected as a gas-solid-liquid three-phase separator. It should be noted here that the structure and working principle of the gas-solid-liquid three-phase separator belong to the scope of the prior art. Therefore, in order to unnecessarily confuse the scheme of the present invention with the prior art, the specific structure and working principle of the gas-solid-liquid three-phase separator in this application will not be repeated.

[0034] Figure 4 The second separator 22 of the embodiment of the present invention is shown. It can be understood that Figure 4 The structure shown in FIG. 1 is an implementation of the second separator 22, which is exemplary and not restrictive. Therefore, the description of the second separator 22 above is also applicable to the description of the second separator 22 below. Figure 4 Description.

[0035] like Figure 4 As shown, the second separator 22 includes a separator housing 221 having a feed port 22a, a return port 22b and an exhaust port 22c, an observation mirror provided on the separator housing 221, and a control valve 223 provided at the feed port 22a and located outside the separator housing 221. Figure 1 , Figure 3 and Figure 4As shown, the biogas collection device 2 also includes a riser pipe 23 connecting the first separator 21 and the second separator 22, and a return pipe 24 connected to the second separator 22. The riser pipe 23 extends obliquely from the top edge of the pool edge 12 toward the central area of ​​the fermentation tank body 11, and the second separator 22 is connected to the top of the first separator 21 through the feed port 22a and is arranged at the top edge of the pool edge 12. The inlet of the return pipe 24 is connected to the return port 22b of the separator housing 221, and the outlet of the return pipe 24 is arranged at the bottom of the fermentation tank body 11.

[0036] Regarding the second separator 22 described above, its feed port 22a is connected to the riser pipe 23 and is used to receive the liquid and biogas from the first separator 21, the return port 22b is connected to the return pipe 24 and is used to discharge the liquid into the fermentation tank body 11, and the exhaust port 22c is used to discharge the biogas generated in the fermentation tank body 11. As for the riser pipe 23 and the return pipe 24 described above, the riser pipe 23 is used to transfer the liquid and biogas from the first separator 21 to the second separator 22, and the return pipe 24 is used to transfer the liquid from the second separator 22 to the bottom of the fermentation tank body 11.

[0037] The observation mirror includes a first eyepiece and a second eyepiece which are relatively arranged on the separator housing 221. The first eyepiece 222 and / or the second eyepiece (not shown) are used to refract and / or reflect the light from the fermentation tank body 11, so that the staff can observe the anaerobic fermentation reaction process in the fermentation tank body 11 through the first eyepiece 222 and / or the second eyepiece. The control valve 223 can adjust the flow of liquid and biogas entering the second separator 22 through the riser 23. When the anaerobic fermentation reaction rate in the fermentation tank body 11 is low or the biogas production is insufficient, the control valve 223 can be closed or partially closed to increase the pressure in the fermentation tank body 11 to ensure the smooth lifting of liquid and biogas, thereby ensuring the normal progress of the anaerobic fermentation reaction in the fermentation tank body 11. Optionally, the separator housing 221 in this embodiment also has a detachable top cover 224 to facilitate the inspection and / or maintenance of the second separator 22.

[0038] Therefore, those skilled in the art can understand that the anaerobic fermentation reaction system 100 provided in the embodiment of the present invention includes a second separator 22 including an observation mirror and a control valve 223 disposed at the top edge of the pool edge 12, which provides convenience for the staff to monitor the anaerobic fermentation reaction process in the fermentation tank body 11 in real time through the eyepiece 222, and when it is observed that the anaerobic fermentation reaction rate in the fermentation tank body 11 slows down or the biogas production is insufficient, the staff can close or partially close the control valve 223 in time to increase the pressure in the fermentation tank body 11 to ensure the smooth lifting of liquid and biogas, so that the anaerobic fermentation reaction in the fermentation tank body 11 can proceed normally and will not be inhibited by low temperature. The anaerobic fermentation reaction system 100 provided in the embodiment of the present invention has the advantages of good safety, simple operation and low cost.

[0039] Furthermore, the anaerobic fermentation reaction system 100 also includes a water distribution pipe 25 connected to the outlet of the return pipe 24, the water distribution pipe 25 is evenly distributed at the bottom of the fermentation tank body 11, and includes a plurality of water distribution ports for evenly discharging the liquid separated from the aquaculture wastewater by the first separator 21 to the bottom of the fermentation tank body 11. The plurality of water distribution ports can play a role in diverting and diffusing the liquid that flows back to the bottom of the fermentation tank body 11 through the return pipe 24, and the liquid discharged through the plurality of water distribution ports can stir the mixture at the bottom of the fermentation tank body 11, thereby accelerating the reaction rate of the anaerobic fermentation reaction.

[0040] In this embodiment, the number of biogas collection devices 2 is selected to be multiple. Correspondingly, the number of second separators 22 is also multiple, and the second separator 22 of each biogas collection device 2 includes a control valve 223 for controlling the biogas release rate. When the anaerobic fermentation reaction rate in the fermentation tank body 11 is low or the biogas production is insufficient, the position and / or number of the control valves 223 to be closed can be selected according to actual needs, so that the staff can more accurately control the anaerobic fermentation reaction process, thereby ensuring that the anaerobic fermentation reaction in the fermentation tank body 11 is carried out normally under low temperature conditions.

[0041] In addition, as a feasible solution, the second separator 22 can be connected to at least two first separators 21 (such as Figure 1 and Figure 3 As shown), the anaerobic fermentation reaction process can be better regulated. When the second separator 22 is connected to at least two first separators 21, the adjacent first separators 21 are connected through the gas collecting pipe 211 to guide and concentrate the biogas between the multiple first separators 21. As another feasible solution, the second separator 22 can also be connected to a first separator 21 (not shown) to reduce the construction cost of the anaerobic fermentation reaction system 100.

[0042] Figure 5The inclined wall 11a and the multilayer structure 11d of the embodiment of the present invention are shown. It can be understood that Figure 5 The inclined wall 11a and the multilayer structure 11d shown in the figure can be implemented in the anaerobic fermentation reaction system 100 described above, which is exemplary and not restrictive. Therefore, the description of the anaerobic fermentation reaction system 100 described above is also applicable to the description of the anaerobic fermentation reaction system 100 described below. Figure 5 Description.

[0043] like Figure 2 and Figure 5 As shown, the fermentation tank body 11 includes a bottom wall 11b, an oblique wall 11a connected to the bottom wall 11b, and a reaction space 11c defined by the bottom wall 11b and the oblique wall 11a. Among them, the bottom wall 11b and the oblique wall 11a of the fermentation tank body 11 are provided with a multilayer structure 11d, and the multilayer structure 11d of the bottom wall 11b and / or the oblique wall 11a includes at least one insulation layer. Specifically, the multilayer structure 11d includes a soil layer, an insulation layer and an impermeable layer arranged in sequence along the direction away from the oblique wall 11a and / or the bottom wall 11b surface. The insulation layer can be selected as an extruded polystyrene insulation board (XPS insulation board), which has the advantages of good heat preservation, low water absorption, good stability, high strength, etc., and is therefore very suitable for the insulation of aquaculture wastewater. The impermeable layer can be selected as a high-density polyethylene film (HDPE film), which has good anti-corrosion performance, moisture resistance, anti-leakage performance, etc., and is therefore very suitable for the impermeability of aquaculture wastewater. The multilayer structure 11d disposed on the surface of the inclined wall 11a and the bottom wall 11b can effectively reduce the heat loss of the aquaculture wastewater in the fermentation tank body 11, and play a role in heating and insulating the aquaculture wastewater under low temperature conditions. Furthermore, an impermeable layer can also be laid on the top of the fermentation tank body 11 so that it can use biogas to form an air bag under low temperature conditions, thereby achieving vacuum insulation.

[0044] In addition, it is worth pointing out that in this embodiment, the fermentation tank body 11 is selected as follows Figure 2 and Figure 5 In the structure shown, the riser 23 and the return pipe 24 are preferably arranged along the surface of the inclined wall 11b. This arrangement can not only reduce the construction difficulty and cost, but also utilize the height difference in the terrain to further increase the transmission rate of liquid and / or biogas in the riser 23 and / or the return pipe 24.

[0045] Figure 6 The mud discharge pipe 4 of the embodiment of the present invention is shown. It can be understood that Figure 6 The sludge discharge pipe 4 shown in the figure can be implemented in the anaerobic fermentation reaction system 100 described above, which is exemplary and not restrictive. Therefore, the description of the anaerobic fermentation reaction system 100 described above is also applicable to the description of the anaerobic fermentation reaction system 100 described below. Figure 6 Description.

[0046] like Figure 1 and Figure 6 As shown, the anaerobic fermentation reaction system 100 also includes a mud discharge pipe 4, whose inlet is arranged at the bottom of the fermentation tank body 11, and the outlet is arranged outside the fermentation tank body 11. A plurality of mud discharge structures 41 are arranged evenly spaced along the circumference of the mud discharge pipe 4, and each mud discharge structure 41 includes a plurality of mud discharge holes arranged at intervals along the axial direction of the mud discharge pipe 4, and the mud discharge holes of two adjacent mud discharge structures 41 are arranged in a staggered manner. Exemplarily, the mud discharge structure 41 can be selected as 3, and the angle between two adjacent groups of mud discharge structures 41 in the radial direction of the mud discharge pipe 4 is 120 degrees.

[0047] Furthermore, the anaerobic fermentation reaction system 100 further includes an exhaust pipe 5 disposed on the pool edge 12 and connected to the exhaust port 22c of the second separator 22, a feed pipe 3 connected to the bottom of the fermentation tank body 11, and a pump body 31 connected to the feed pipe 3 (see Figure 1 ). The outlet of the feed pipe 3 is arranged in the fermentation tank body 11, and the inlet thereof is arranged outside the fermentation tank body 11, and the pump body 31 is used to transport the aquaculture wastewater to the fermentation tank body 11. When the anaerobic fermentation reaction rate in the fermentation tank body 11 slows down or the biogas production is insufficient under low temperature conditions, the amount of aquaculture wastewater transported to the fermentation tank body 11 can be increased by the pump body 31 to ensure the normal progress of the anaerobic fermentation reaction in the fermentation tank body 11. Exemplarily, the pump body 31 can be selected as a sewage pump with good corrosion resistance and not easy to be blocked.

[0048] Through the above description, it can be understood by those skilled in the art that the anaerobic fermentation reaction system 100 provided in the embodiment of the present invention realizes the observation and regulation of the anaerobic fermentation reaction process in the fermentation tank body 11 by arranging the second separator 22 including the observation mirror and the control valve 223 at the top edge of the pool edge 12. When the staff observes through the eyepiece 222 that the anaerobic fermentation reaction rate in the fermentation tank body 11 is low or the biogas production is insufficient, the control valve 223 can be closed or partially closed to adjust the flow of liquid and biogas entering the second separator 22 through the riser 23, thereby increasing the pressure in the fermentation tank body 11 to ensure the smooth lifting of liquid and biogas. Therefore, the anaerobic fermentation reaction system 100 provided in the embodiment of the present invention can ensure that the anaerobic fermentation reaction in the fermentation tank body 11 can still proceed normally under the condition of low external temperature such as winter, and has the advantages of good safety, simple operation, low cost, etc.

[0049] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0050] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or position relationship, are based on the orientation or position relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0051] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0052] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An anaerobic fermentation reaction system, characterized in that: include: A biogas generating device, comprising a fermentation tank body for causing aquaculture wastewater to undergo anaerobic fermentation reaction to generate biogas and a tank edge arranged on the top of the fermentation tank body; as well as A biogas collection device, comprising: A first separator, which is arranged in the fermentation tank body and is used to collect the biogas and liquid in the aquaculture wastewater and discharge the solids in the aquaculture wastewater to the bottom of the fermentation tank body; A second separator, which is connected to the top of the first separator and is used to collect the biogas in the aquaculture wastewater and discharge the liquid in the aquaculture wastewater to the bottom of the fermentation tank; Wherein, the second separator is arranged at the top edge of the pool and comprises an observation mirror capable of observing the anaerobic fermentation reaction and a control valve capable of regulating the anaerobic fermentation reaction.

2. The anaerobic fermentation reaction system according to claim 1, characterized in that: The biogas collecting device further comprises a riser pipe connecting the first separator and the second separator, wherein the riser pipe extends obliquely from the top edge of the tank edge toward the central area of ​​the fermentation tank body.

3. The anaerobic fermentation reaction system according to claim 2, characterized in that: The second separator also includes a separator shell, which has a feed port for receiving biogas and liquid from the first separator, a return port for discharging liquid into the fermentation tank body, and an exhaust port for releasing biogas; the observation mirror is arranged on the separator shell.

4. The anaerobic fermentation reaction system according to claim 3, characterized in that: The observation mirror comprises a first eyepiece and a second eyepiece which are arranged on the separator housing in opposite directions. The first eyepiece and / or the second eyepiece are used to refract and / or reflect the light from the fermentation tank body.

5. The anaerobic fermentation reaction system according to claim 4, characterized in that: There are multiple biogas collection devices, and the second separator of each biogas collection device also includes a control valve for controlling the release speed of the biogas. The control valve is arranged at the feed inlet of the separator shell and is located outside the separator shell.

6. The anaerobic fermentation reaction system according to any one of claims 1 to 5, characterized in that: The fermentation tank body includes a bottom wall, an inclined wall connected to the bottom wall, and a reaction space defined by the bottom wall and the inclined wall. The bottom wall and the inclined wall surface are both provided with a multi-layer structure, and the multi-layer structure of the bottom wall and / or the inclined wall includes at least one insulation layer.

7. The anaerobic fermentation reaction system according to any one of claims 1 to 5, characterized in that: The anaerobic fermentation reaction system also includes a mud discharge pipe, whose inlet is arranged at the bottom of the fermentation tank body and the outlet is arranged outside the fermentation tank body. The mud discharge pipe is provided with a plurality of mud discharge structures evenly spaced along its circumference, each of the mud discharge structures includes a plurality of mud discharge holes spaced along the axial direction of the mud discharge pipe, and the mud discharge holes of two adjacent mud discharge structures are staggered.

8. The anaerobic fermentation reaction system according to claim 3, characterized in that: The biogas collection device also includes a return pipe connected to the second separator and used to discharge liquid into the fermentation tank body. The inlet of the return pipe is connected to the return port of the separator shell, and the outlet of the return pipe is arranged at the bottom of the fermentation tank body.

9. The anaerobic fermentation reaction system according to any one of claims 1 to 5, characterized in that: The anaerobic fermentation reaction system also includes a feed pipe connected to the bottom of the fermentation tank body and a pump body connected to the feed pipe. The outlet of the feed pipe is arranged inside the fermentation tank body, and the inlet of the feed pipe is arranged outside the fermentation tank body. The pump body is used to transport the aquaculture wastewater into the fermentation tank body.

10. The anaerobic fermentation reaction system according to claim 8, characterized in that: The anaerobic fermentation reaction system also includes a water distribution pipe connected to the return pipe, the water distribution pipe is connected to the outlet of the return pipe, the water distribution pipe is evenly distributed at the bottom of the fermentation tank body, and includes a plurality of water distribution ports for discharging the liquid separated from the aquaculture wastewater by the first separator.

Images