Anaerobic reactor for the treatment of organic waste water

Abstract

The application provides an organic wastewater treatment anaerobic reactor and relates to the field of environmental protection water treatment. The organic wastewater treatment anaerobic reactor comprises a reactor body, a desanding cyclone, a water distribution system, a shunt dilution device and an annular sludge discharge device. The water distribution system is installed at the bottom of the reactor body, the desanding cyclone is communicated with the water distribution system through a scale inhibitor dosing main pipe, the shunt dilution device is communicated with the top of the reactor body and is fluidly communicated with the scale inhibitor dosing main pipe through a reflux pipe, and the annular sludge discharge device is arranged around the outer periphery of the bottom of the reactor body and is communicated with the reactor body through a plurality of sludge discharge ports which are arranged at intervals along the extension direction of the annular sludge discharge device. The organic wastewater treatment anaerobic reactor provided by the application solves the technical problems of low treatment efficiency and poor effect of the existing high-concentration organic wastewater treatment device.

Description

Technical Field

[0001] This application relates to the field of environmental water treatment, and more specifically, to an anaerobic reactor for treating organic wastewater. Background Technology

[0002] Currently, the main methods for treating high-concentration organic wastewater include physical, chemical, and biological methods. Anaerobic technology is a commonly used biochemical treatment technology for high-concentration organic wastewater and is also the most economical technology for treating high-concentration organic wastewater.

[0003] Anaerobic technology is a process in which microorganisms in sludge convert organic matter in wastewater into substances such as methane and carbon dioxide. Wastewater usually contains impurities such as sand, calcium and magnesium ions, and inorganic components. Therefore, the removal of wastewater impurities, control of calcium and magnesium ion concentration, and inhibition of calcification are crucial. There are usually several ways to remove impurities in anaerobic reactors, each with its own drawbacks: (1) Setting up an air flotation or primary sedimentation tank before the influent. The principle of air flotation is to remove impurities through flotation, but sand is too heavy to be effectively removed. In the primary sedimentation tank, due to a large amount of suspended solids, a certain amount of suspended solids will coat the sand and enter the subsequent anaerobic reactor with the effluent; (2) External circulating water to the acidification tank. The circulating water mixed with the influent in the acidification tank will cause air (dissolved oxygen to increase), making it easier for calcium and magnesium ions in the anaerobic reactor to be absorbed and calcified; (3) Scale inhibitors are directly added to the acidification tank. When scale inhibitors are directly added to the acidification tank, the acidifying bacteria in the acidification tank will directly decompose part of the organic matter in the scale inhibitor, greatly reducing the content of effective ingredients, resulting in an increase in the dosage of the drug and a certain inhibitory effect on microbial activity. (4) Traditional anaerobic reactors only have one sludge inlet connected to the sludge pump. Due to the single sludge discharge point, and the poor fluidity of calcified sludge, traditional anaerobic reactors cannot effectively discharge sludge. Utility Model Content

[0004] The purpose of this application is to provide an anaerobic reactor for treating organic wastewater, so as to alleviate the technical problems of low treatment efficiency and poor effect of existing high-concentration organic wastewater treatment devices.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] The anaerobic reactor for treating organic wastewater provided by this utility model includes a reactor body, a sand removal hydrocyclone, a water distribution system, a diversion and dilution device, and an annular sludge discharge device.

[0007] The water distribution system is installed at the bottom of the reactor body, and the sand removal hydrocyclone is connected to the water distribution system through a scale inhibitor dosing header.

[0008] The diversion and dilution device is connected to the top of the reactor body and is in fluid communication with the scale inhibitor dosing header through a return pipe;

[0009] The annular sludge discharge device is arranged around the bottom periphery of the reactor body and is connected to the reactor body through multiple sludge discharge ports, which are spaced apart along the extension direction of the annular sludge discharge device.

[0010] Furthermore, the water distribution system includes water distribution pipes, spray nozzles, and water distribution covers;

[0011] The water distribution pipe is installed at the bottom of the reactor body and is connected to the scale inhibitor dosing main pipe;

[0012] The spray nozzle is installed on the outer wall of the water distribution pipe, and the water distribution cover covers the water distribution pipe.

[0013] Furthermore, each of the water distribution pipes is equipped with multiple spray nozzles, and at least one of the spray nozzles is oriented differently from the other spray nozzles.

[0014] Furthermore, the two adjacent nozzles are oriented differently.

[0015] Furthermore, multiple water distribution pipes are provided, and the multiple water distribution pipes are arranged radially with the center of the reactor body as the base point.

[0016] Furthermore, the desanding hydrocyclone is equipped with a water inlet pipe;

[0017] The return pipe is connected to the inlet pipe; or, the return pipe is connected to the scale inhibitor dosing main pipe.

[0018] Furthermore, it also includes a first-stage three-phase separator, a second-stage three-phase separator, and a gas-liquid separator;

[0019] Both the first-stage three-phase separator and the second-stage three-phase separator are installed inside the reactor body and are spaced apart along the axial direction of the reactor body;

[0020] The gas-liquid separator is installed at the top of the reactor body and is connected to the first-stage three-phase separator and the second-stage three-phase separator.

[0021] Furthermore, the gas-liquid separator is provided with a first riser pipe, a second riser pipe, and a guide pipe;

[0022] Both the first riser pipe and the second riser pipe extend into the interior of the reactor body, and the length of the first riser pipe is greater than the length of the second riser pipe. The first riser pipe is connected to the first-stage three-phase separator, and the second riser pipe is connected to the second-stage three-phase separator.

[0023] The guide pipe is located at the top of the gas-liquid separator.

[0024] Furthermore, the gas-liquid separator is equipped with an internal circulation pipe that extends into the interior of the reactor body.

[0025] Furthermore, the bottom end of the internal circulation pipe extends into the water distribution system.

[0026] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows:

[0027] The anaerobic reactor for treating organic wastewater provided by this utility model includes a reactor body, a desanding hydrocyclone, a water distribution system, a diversion and dilution device, and an annular sludge discharge device. The water distribution system is installed at the bottom of the reactor body, and the desanding hydrocyclone is connected to the water distribution system through a scale inhibitor dosing header. The diversion and dilution device is connected to the top of the reactor body and is fluidly connected to the scale inhibitor dosing header through a return pipe. The annular sludge discharge device is arranged around the bottom periphery of the reactor body and is connected to the reactor body through multiple sludge discharge ports, which are spaced apart along the extension direction of the annular sludge discharge device.

[0028] When using this anaerobic reactor for treating organic wastewater, the wastewater flows sequentially through a sand-removing hydrocyclone separator, a scale inhibitor dosing header, a water distribution system, the chamber of the reactor body, and a diversion and dilution device. After flowing out of the diversion and dilution device, part of the effluent is sent to the subsequent treatment section for further treatment, while part of the effluent is returned to the front end of the reactor body through a return pipe to mix with the influent.

[0029] The sand-removing cyclone separator is installed at the front end of the reactor body water inlet and connected to the scale inhibitor dosing header. It achieves sand-water separation through the centrifugal principle of density difference, preventing stones and sand from entering the reactor body.

[0030] The diversion and dilution device is connected to the top of the reactor body. Part of the effluent from the diversion and dilution device is sent to the subsequent treatment section for further processing, while part of the effluent is returned to the front end of the reactor body through the return pipe to mix with the influent, thus playing a role in circulation and dilution.

[0031] The scale inhibitor dosing header is connected to the water distribution system at the bottom of the reactor body. The scale inhibitor is delivered into the scale inhibitor dosing header through a metering pump and dosing pipeline. Here, the scale inhibitor is mixed with the return dilution water and the inlet water once, and then evenly distributed to the water distribution system. It enters the reactor body and mixes with the mud and water, thereby inhibiting the scaling of bacteria.

[0032] An annular sludge discharge device is installed around the bottom of the reactor body, with a sludge discharge port set at regular intervals along the reactor body to facilitate timely discharge of inorganic sludge or transfer of inoculum during maintenance.

[0033] This anaerobic reactor for organic wastewater treatment features a pre-sand removal function, thorough mixing of pre-inhibiting agents, dilution, and sludge-water mixing. It has a strong removal rate and dilution capacity for organic pollutants and calcifications, enabling the long-term stable operation of the anaerobic reactor for organic wastewater treatment.

[0034] This anaerobic reactor for organic wastewater treatment has the following advantages:

[0035] The sand-removing cyclone separator can ensure efficient separation of sand and gravel, preventing sand and gravel from entering the reactor body and causing blockage of the water distribution system, which would affect the reactor's organic matter removal efficiency.

[0036] The scale inhibitor dosing header is located at the front end of the water distribution system to ensure efficient use of the scale inhibitor, enabling it to be utilized in the shortest possible time and preventing it from being degraded by acidifying bacteria, which would lead to excessive consumption.

[0037] The external circulation system is sealed and mixed with the inlet water through the scale inhibitor dosing main pipe to avoid the intake of air and carbon dioxide, thus preventing the risk of excessive absorption of calcium and magnesium ions.

[0038] With the coordinated action of all components, it can efficiently treat high-concentration organic wastewater from different industries, featuring low energy consumption, high removal efficiency, good effluent quality, large biogas production, and no odor. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the anaerobic reactor for organic wastewater treatment provided in the embodiments of this application;

[0041] Figure 2 This is a schematic diagram of the water distribution system in the anaerobic reactor for organic wastewater treatment provided in an embodiment of this application.

[0042] icon:

[0043] 1-Inlet pipe; 2-Sand desander hydrocyclone; 3-Scale inhibitor dosing main pipe; 4-Water distribution pipe; 5-Water distribution hood; 6-Spray nozzle; 7-First-stage three-phase separator; 8-Internal circulation pipe; 9-First riser pipe; 10-Second-stage three-phase separator; 11-Gas-liquid separator; 12-Guide pipe; 13-Second riser pipe; 14-Diverter and dilution device; 15-Connecting pipe; 16-Return pipe; 17-Return control valve; 18-Annular sludge discharge device; 19-Sampling pipe. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] Currently, the main methods for treating high-concentration organic wastewater include physical, chemical, and biological methods. Physical and chemical methods are characterized by low removal efficiency and high treatment costs, and the chemicals introduced in chemical methods can also cause secondary pollutants. Anaerobic technology is a commonly used biochemical treatment technology for high-concentration organic wastewater and is currently the most economical technology for treating such wastewater. It generates additional benefits while treating pollutants, bringing significant advantages to wastewater treatment. Therefore, researchers have been continuously striving to develop new anaerobic technologies and more advantageous anaerobic reactors. However, most current equipment used in high-concentration organic wastewater treatment projects still suffers from problems such as low treatment efficiency, low organic load, uneven water distribution, and weak resistance to shock loads.

[0048] Anaerobic technology is a process in which microorganisms in sludge convert organic matter in wastewater into substances such as methane and carbon dioxide. Wastewater usually contains impurities such as gravel, calcium and magnesium ions, and inorganic components. Therefore, the removal of wastewater impurities, control of calcium and magnesium ion concentration, and inhibition of calcification are crucial. There are usually several ways to remove impurities in anaerobic reactors: (1) Install air flotation or primary sedimentation tanks before the pre-water. The principle of air flotation is to remove impurities through flotation. However, gravel has a high specific gravity and cannot be effectively removed. In the primary sedimentation tank, due to a large amount of suspended solids, a certain amount of suspended solids will coat the gravel and enter the subsequent anaerobic reactor with the effluent; (2) External circulating water to acidification tank. Circulating water to acidification tank and mixing with the influent will cause air (dissolved oxygen to increase), making it easier for calcium and magnesium ions in the anaerobic reactor to be absorbed and calcified; (3) Scale inhibitor is directly added to acidification tank. Directly adding scale inhibitor to acidification tank will cause the acidifying bacteria in the acidification tank to directly decompose part of the organic matter of the scale inhibitor, greatly reducing the content of effective ingredients, resulting in an increase in the dosage of the added drug and a certain inhibitory effect on microbial activity. (4) Traditional anaerobic reactors only have one sludge inlet connected to the sludge pump. Due to the single sludge discharge point, and the poor fluidity of calcified sludge, traditional anaerobic reactors cannot effectively discharge sludge.

[0049] In view of this, see Figure 1 The anaerobic reactor for treating organic wastewater provided in this embodiment of the present invention includes a reactor body, a desanding hydrocyclone 2, a water distribution system, a diversion and dilution device 14, and an annular sludge discharge device 18. The water distribution system is installed at the bottom of the reactor body, and the desanding hydrocyclone 2 is connected to the water distribution system through a scale inhibitor dosing header 3. The diversion and dilution device 14 is connected to the top of the reactor body and is fluidly connected to the scale inhibitor dosing header 3 through a return pipe 16. The annular sludge discharge device 18 is arranged around the bottom periphery of the reactor body and is connected to the reactor body through multiple sludge discharge ports, which are spaced apart along the extension direction of the annular sludge discharge device 18.

[0050] The reactor features efficient sand removal before water intake, with forced closed-loop circulation to inlet pipe 1 (same as inlet pipe 1 below), eliminating any air contact and reducing carbon dioxide and air intake while ensuring the sludge bed remains in a suspended or expanded state, resulting in high organic matter removal efficiency. Scale inhibitors are directly injected into the scale inhibitor dosing header 3, ensuring timely and uniform mixing within the reactor body for maximum calcification inhibition. A newly installed annular sludge discharge device 18 facilitates the discharge of calcified sludge during maintenance or repairs.

[0051] When the anaerobic reactor for treating organic wastewater is used, the wastewater flows sequentially through the sand removal hydrocyclone separator, the scale inhibitor dosing header 3, the water distribution system, the chamber of the reactor body, and the dilution device 14. After flowing out of the dilution device 14, part of the effluent is sent to the subsequent treatment section for further treatment, and part of the effluent is returned to the front end of the reactor body through the return pipe 16 to mix with the influent.

[0052] The sand removal cyclone separator is installed at the front end of the reactor body water inlet and connected to the scale inhibitor dosing main pipe 3. It achieves sand-water separation effect through the centrifugal principle of specific gravity density difference, thus preventing stones and sand from entering the reactor body.

[0053] The diversion and dilution device 14 is connected to the top of the reactor body. Part of the water from the diversion and dilution device 14 is sent to the subsequent treatment section for further processing, and part of the water is returned to the front end of the reactor body through the return pipe 16 to mix with the influent, thus playing a role in circulation and dilution.

[0054] The scale inhibitor dosing header 3 is connected to the water distribution system at the bottom of the reactor body. The scale inhibitor is delivered into the scale inhibitor dosing header 3 through a metering pump and dosing pipeline. Here, the scale inhibitor is mixed with the return dilution water and the inlet water once, and then evenly distributed to the water distribution system. It enters the reactor body and mixes with the mud and water, which inhibits the scaling of bacteria and reduces the risk of degradation.

[0055] See Figure 1 and Figure 2 The annular sludge discharge device 18 is arranged around the bottom periphery of the reactor body, with a sludge discharge port set at regular intervals along the reactor body to facilitate timely discharge of inorganic sludge or transfer of inoculum during maintenance. It is generally made of 304 stainless steel.

[0056] This anaerobic reactor for organic wastewater treatment features a pre-sand removal function, thorough mixing of pre-inhibiting agents, dilution, and sludge-water mixing. It has a strong removal rate and dilution capacity for organic pollutants and calcifications, enabling the long-term stable operation of the anaerobic reactor for organic wastewater treatment.

[0057] This anaerobic reactor for organic wastewater treatment has the following advantages:

[0058] The sand-removing cyclone separator can ensure efficient separation of sand and gravel, preventing sand and gravel from entering the reactor body and causing blockage of the water distribution system, which would affect the reactor's organic matter removal efficiency.

[0059] The scale inhibitor dosing header 3 is located at the front end of the water distribution system to ensure efficient use of the scale inhibitor, enabling it to be used in the shortest possible time and avoiding degradation by acidifying bacteria, which would lead to excessive consumption of the agent.

[0060] The external circulation system is sealed and mixed with the inlet water in the scale inhibitor dosing main pipe 3 to avoid the intake of air and carbon dioxide, which would lead to a large risk of calcium and magnesium ion absorption.

[0061] With the coordinated action of all components, it can efficiently treat high-concentration organic wastewater from different industries, featuring low energy consumption, high removal efficiency, good effluent quality, large biogas production, and no odor.

[0062] The following is a detailed description of the structure of the anaerobic reactor for organic wastewater treatment:

[0063] In an optional embodiment of this utility model, the water distribution system includes a water distribution pipe 4, a spray nozzle 6, and a water distribution cover 5; the water distribution pipe 4 is installed at the bottom of the reactor body and is connected to the scale inhibitor dosing main pipe 3; the spray nozzle 6 is installed on the outer wall of the water distribution pipe 4, and the water distribution cover 5 covers the water distribution pipe 4.

[0064] Specifically, see Figure 1 and Figure 2 The water distribution pipe 4 is connected to the spray nozzle 6, and the water distribution cover 5 is umbrella-shaped.

[0065] Wastewater enters the reactor body through the distribution pipe 4 and is then sprayed out from the nozzle 6 installed on the distribution pipe 4. After passing through the water distribution hood 5, it forms an upward swirling flow, which initially mixes with the anaerobic sludge. This water distribution method can increase the internal swirling flow, allowing the wastewater and sludge to mix thoroughly, increasing the mass transfer effect, and achieving efficient removal of organic matter.

[0066] In an optional embodiment of this utility model, each water distribution pipe 4 is equipped with a plurality of spray nozzles 6, and at least one spray nozzle 6 has a different orientation from the other spray nozzles 6.

[0067] Specifically, multiple spray nozzles 6 are spaced apart along the axial direction of the water distribution pipe 4.

[0068] The water distribution pipe 4 is equipped with multiple nozzles 6 to enhance the spraying effect. At least one nozzle 6 is oriented differently from the other nozzles 6, so that the wastewater is sprayed in different directions, thereby accelerating the swirling speed.

[0069] In an optional embodiment of this utility model, two adjacent nozzles 6 have different orientations.

[0070] Specifically, in this embodiment, half of the nozzles 6 on each water distribution pipe 4 are angled downwards at a 30° angle to the horizontal, and the other half are angled upwards at a 30° angle to the horizontal, evenly distributed on the upper and lower sides of the water distribution pipe 4, with nozzles 6 of different orientations arranged alternately. Of course, nozzles 6 of different orientations can also be arranged in other distribution patterns, such as multiple nozzles 6 of the same orientation forming a group, with adjacent groups of nozzles 6 having different orientations; this should also be within the protection scope of this utility model embodiment. Furthermore, the angle of inclination of the nozzles 6 can be set between 0-90°, for example, 15 degrees, 20°, or 45°.

[0071] The two adjacent nozzles 6 are oriented differently, which further enables the wastewater to be sprayed in different directions, thereby accelerating the swirling speed.

[0072] In an optional embodiment of this utility model, multiple water distribution pipes 4 are provided, and the multiple water distribution pipes 4 are arranged radially with the center of the reactor body as the base point.

[0073] Specifically, the water distribution system is made of stainless steel support frame and PP pipe. The water distribution system is equipped with control valves, flow meters, check valves, and a pH meter to control the flow rate and pH of the water distribution system.

[0074] The multiple water distribution pipes 4 of the water distribution system are arranged in a circular fan-shaped swirling water distribution shape, which helps to increase the internal swirling flow, so that the wastewater and sludge are fully mixed, the mass transfer effect is increased, and the organic matter is removed efficiently.

[0075] In an optional embodiment of this utility model, the desanding hydrocyclone 2 is provided with an inlet pipe 1; the return pipe 16 is connected to the inlet pipe 1; or, the return pipe 16 is connected to the scale inhibitor dosing main pipe 3.

[0076] Specifically, an outlet pipe is installed at the top of the reactor body, above the second-stage three-phase separator 10 (hereinafter referred to as the second-stage three-phase separator 10), and connected to the dilution device 14 outside the reactor body. Furthermore, a reflux control valve 17 is installed on the reflux pipe 16.

[0077] The return pipe 16 is connected to the inlet pipe 1 or the scale inhibitor dosing main pipe 3, which can realize the return of part of the water from the diversion dilution device 14 to the scale inhibitor dosing main pipe 3, thus playing a role in circulation dilution.

[0078] In the optional embodiments of this utility model, see Figure 1 It also includes a first-stage three-phase separator 7, a second-stage three-phase separator 10, and a gas-liquid separator 11; the first-stage three-phase separator 7 and the second-stage three-phase separator 10 are both installed inside the reactor body and are spaced apart along the axial direction of the reactor body; the gas-liquid separator 11 is installed at the top of the reactor body and is connected to the first-stage three-phase separator 7 and the second-stage three-phase separator 10.

[0079] Specifically, the area between the water distribution system and the first-stage three-phase separator 7 forms a high-load reaction zone; the area between the first-stage three-phase separator 7 and the second-stage three-phase separator 10 forms a low-load zone. The materials of the first-stage three-phase separator 7 and the second-stage three-phase separator 10 are both made of PP plates assembled and welded together.

[0080] A first-stage three-phase separator 7 is installed above the water distribution system, thus forming a high-load reaction zone between the water distribution system and the first-stage three-phase separator 7. In this zone, 55%-75% of the organic matter in the wastewater is removed. After treatment in the high-load reaction zone, the wastewater rises and passes through the first-stage three-phase separator 7 for sludge-water separation. Most of the sludge is returned to the high-load reaction zone, while the wastewater enters the low-load reaction zone for further treatment, where 15%-30% of the organic matter is removed. The wastewater then passes through a second-stage three-phase separator 10 for sludge-water separation. The sludge is returned to the low-load reaction zone, and the treated wastewater flows out from above the second-stage three-phase separator 10 to a dilution device 14. The dilution device 14 diverts the wastewater; part of the effluent flows through a connecting pipe 15 to subsequent stages for further treatment, while the other part flows through a return pipe 16 back to the scale inhibitor dosing header 3 for further circulation and dilution of the influent.

[0081] In an optional embodiment of this utility model, the gas-liquid separator 11 is provided with a first riser pipe 9, a second riser pipe 13, and a guide pipe 12; both the first riser pipe 9 and the second riser pipe 13 extend into the interior of the reactor body, and the length of the first riser pipe 9 is greater than the length of the second riser pipe 13. The first riser pipe 9 is connected to the first-stage three-phase separator 7, and the second riser pipe 13 is connected to the second-stage three-phase separator 10; the guide pipe 12 is located at the top of the gas-liquid separator 11.

[0082] Specifically, two gas-liquid separators 11 are provided. Furthermore, each gas-liquid separator 11 is equipped with an internal circulation pipe 8, which extends into the interior of the reactor body. Preferably, the bottom end of the internal circulation pipe 8 extends into the water distribution system. The internal circulating water can dilute and hydraulically treat the incoming water, allowing the high-load area of ​​the system to better maintain an expanded bed state.

[0083] Biogas generated in the high-load zone is collected by the first-stage three-phase separator 7 and led to the gas-liquid separator 11 located at the top of the reactor through the first riser pipe 9. Biogas generated in the low-load reaction zone is collected by the second-stage three-phase separator 10 and enters the gas-liquid separator 11 located at the top of the reactor through the second riser pipe 13. The biogas generated in these two reaction zones mixes in the gas-liquid separator 11. Wastewater carried by the biogas during its ascent into the gas-liquid separator 11 is separated from the biogas and then flows back to the bottom of the water distribution hood 5 through the internal circulation pipe 8 to mix with the influent. This internal circulation water dilutes the influent, greatly enhancing the system's resistance to shock loads and toxicity. The separated biogas is discharged from the guide pipe 12 at the top of the gas-liquid separator 11. The top of the reactor is a fully sealed cover design, preventing odors from escaping into the surrounding environment.

[0084] In an optional embodiment of this utility model, sampling tubes 19 are provided on the side wall of the reactor body. The sampling tubes 19 are distributed at different height positions of the reactor body, and their function is to detect and sample the sludge concentration at different sludge layer heights inside the reactor.

[0085] When using this anaerobic reactor for organic wastewater treatment, please refer to... Figure 1 Wastewater enters the reactor body through the distribution pipe 4 and is sprayed out from several nozzles 6 installed on the distribution pipe 4, forming an upward swirling flow after passing through the distribution hood 5. A first-stage three-phase separator 7 is installed above the distribution system. The area between the distribution system and the first-stage three-phase separator 7 forms a high-load reaction zone, in which 55%-75% of the organic matter in the wastewater is removed. After treatment in the high-load reaction zone, the wastewater rises and passes through the first-stage three-phase separator 7 for sludge-water separation. Most of the sludge is returned to the high-load reaction zone, and the wastewater enters the low-load reaction zone for further treatment, where 15%-30% of the organic matter is removed. Afterward, the wastewater passes through the second-stage three-phase separator 10 for sludge-water separation. The sludge is returned to the low-load reaction zone, and the treated wastewater flows out from above the second-stage three-phase separator 10 to the dilution device 14. The dilution device 14 diverts part of the effluent to subsequent stages for further treatment, and part of the effluent is returned to the scale inhibitor dosing header 3 via the return pipe 16 for further circulation and dilution of the influent. The biogas produced in the high-load zone is collected by the first-stage three-phase separator 7 and led to the gas-liquid separator 11 located at the top of the reactor through the first riser pipe 9. The biogas produced in the low-load reaction zone is collected by the second-stage three-phase separator 10 and enters the gas-liquid separator 11 located at the top of the reactor through the second riser pipe 13. The biogas produced in the two reaction zones are mixed in the gas-liquid separator 11. The wastewater carried by the biogas as it rises into the gas-liquid separator 11 is separated from the biogas in the gas-liquid separator 11 and then flows back to the bottom of the water distribution hood 5 through the internal circulation pipe 8 to mix with the inlet water. The separated biogas is discharged from the guide pipe 12 at the top of the gas-liquid separator 11.

[0086] The advantages of this anaerobic reactor for treating organic wastewater are: a pre-mounted sand removal device and a scale inhibitor dosing main pipe 3, which enhances the ability to remove impurities and has a good scale inhibition effect of calcium and magnesium ions; a forced closed external circulation function, which has a strong ability to resist load shocks and greatly reduces the intake of carbon dioxide and air; while converting organic pollutants into biogas and reusing resources, it also enables the sludge to produce and metabolize in a benign manner; the reactor is closed and odorless, which is environmentally friendly.

[0087] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0088] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An anaerobic reactor for treating organic wastewater, characterized in that, include: The reactor body, the sand removal hydrocyclone (2), the water distribution system, the dilution device (14), and the annular sludge discharge device (18); The water distribution system is installed at the bottom of the reactor body, and the sand removal hydrocyclone (2) is connected to the water distribution system through the scale inhibitor dosing header (3); The dilution device (14) is connected to the top of the reactor body and is in fluid communication with the scale inhibitor dosing header (3) through the return pipe (16); The annular sludge discharge device (18) is arranged around the bottom periphery of the reactor body and is connected to the reactor body through multiple sludge discharge ports, which are spaced apart along the extension direction of the annular sludge discharge device (18).

2. The anaerobic reactor for treating organic wastewater according to claim 1, characterized in that, The water distribution system includes a water distribution pipe (4), a spray nozzle (6), and a water distribution cover (5); The water distribution pipe (4) is installed at the bottom of the reactor body and is connected to the scale inhibitor dosing main pipe (3); The spray nozzle (6) is installed on the outer wall of the water distribution pipe (4), and the water distribution cover (5) covers the water distribution pipe (4).

3. The anaerobic reactor for treating organic wastewater according to claim 2, characterized in that, Each of the water distribution pipes (4) is equipped with a plurality of spray nozzles (6), and at least one of the spray nozzles (6) is oriented differently from the other spray nozzles (6).

4. The anaerobic reactor for treating organic wastewater according to claim 3, characterized in that, The two adjacent nozzles (6) are oriented differently.

5. The anaerobic reactor for treating organic wastewater according to claim 2, characterized in that, Multiple water distribution pipes (4) are provided, and the multiple water distribution pipes (4) are arranged radially with the center of the reactor body as the base point.

6. The anaerobic reactor for treating organic wastewater according to any one of claims 1-5, characterized in that, The desanding hydrocyclone (2) is equipped with a water inlet pipe (1); The return pipe (16) is connected to the inlet pipe (1); or, the return pipe (16) is connected to the scale inhibitor dosing main pipe (3).

7. The anaerobic reactor for treating organic wastewater according to any one of claims 1-5, characterized in that, It also includes a first-stage three-phase separator (7), a second-stage three-phase separator (10), and a gas-liquid separator (11); The first-stage three-phase separator (7) and the second-stage three-phase separator (10) are both installed inside the reactor body and are spaced apart along the axial direction of the reactor body; The gas-liquid separator (11) is installed at the top of the reactor body and is connected to the first-stage three-phase separator (7) and the second-stage three-phase separator (10).

8. The anaerobic reactor for treating organic wastewater according to claim 7, characterized in that, The gas-liquid separator (11) is provided with a first riser pipe (9), a second riser pipe (13) and a guide pipe (12); Both the first riser pipe (9) and the second riser pipe (13) extend into the interior of the reactor body, and the length of the first riser pipe (9) is greater than the length of the second riser pipe (13). The first riser pipe (9) is connected to the first stage three-phase separator (7), and the second riser pipe (13) is connected to the second stage three-phase separator (10). The guide pipe (12) is located at the top of the gas-liquid separator (11).

9. The anaerobic reactor for treating organic wastewater according to claim 8, characterized in that, The gas-liquid separator (11) is provided with an internal circulation pipe (8), which extends into the interior of the reactor body.

10. The anaerobic reactor for treating organic wastewater according to claim 9, characterized in that, The bottom end of the internal circulation pipe (8) extends into the water distribution system.

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