Short-cut nitrification and anaerobic ammonia oxidation coupling integrated device

Abstract

The utility model discloses a short-cut nitrification coupling anaerobic ammonia oxidation integrated reactor, a perforated plate is arranged in the reactor, and a first part for short-cut nitrification and a second part for anaerobic ammonia oxidation are respectively distributed on the upper side and the lower side of the perforated plate; sludge of nitrite bacteria is attached to the interior of the first part through a first filler so as to fix aerobic bacteria, and the first part is connected with an aeration source; anaerobic ammonia oxidizing bacteria are fixed in the second part through a second filler; the size of the filler is greater than the hole size of the perforated plate; the second part is provided with a muddy water backflow and separation module; the muddy water backflow and separation module comprises the muddy water separation area and a sludge backflow area which is integrally connected with the muddy water separation area; a water outlet pipe is connected into the mud-water separation area and is used for separating and discharging aged sludge. The reactor can stabilize the growth of dominant bacteria and improve the denitrification treatment effect.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a short-range nitrification coupled anaerobic ammonia oxidation integrated device. Background Technology

[0002] As a novel, highly efficient, and energy-saving biological nitrogen removal process, anammox (ANAO) technology is currently the fastest biological nitrogen removal route. It requires no additional aeration equipment and has low carbon source requirements, thus offering significant economic advantages and promising prospects in the field of biological nitrogen removal. However, the biggest challenges facing existing ANAO processes are: firstly, anammox bacteria grow slowly and are relatively fragile, being highly sensitive to changes in environmental factors such as pH and dissolved oxygen; secondly, ANAO cannot directly utilize nitrate nitrogen but requires sufficient nitrite nitrogen.

[0003] Traditional processes often involve recirculating the mixed liquor after aeration, which requires a larger footprint, necessitates the construction of a new downstream nitrification tank, and makes it difficult to control the degree of nitrification in the recirculated liquor. However, when an integrated reactor needs to be built, the aeration at the bottom can inhibit the growth of anaerobic ammonia-oxidizing bacteria. These issues have become the technical problems that urgently need to be solved in this field. Utility Model Content

[0004] To address the technical problems in the existing technology, the purpose of this utility model is to provide a short-range nitrification coupled anaerobic ammonia oxidation integrated device that can stabilize the growth of dominant bacterial strains and improve the denitrification effect.

[0005] The purpose of this invention is to provide a short-path nitrification coupled with anaerobic ammonia oxidation integrated reactor, and the technical solution adopted is as follows:

[0006] An integrated short-cut nitrification coupled with anaerobic ammonium oxidation reactor is disclosed. The reactor contains a perforated plate, with a first section for short-cut nitrification and a second section for anaerobic ammonium oxidation distributed on its upper and lower sides. The first section contains sludge with nitrifying bacteria attached to a first packing material to immobilize aerobic bacteria, and is connected to an aeration source. The second section contains anaerobic ammonium oxidation bacteria immobilized by a second packing material. The size of the packing material is larger than the perforation size of the perforated plate. The second section includes a sludge-water recirculation and separation module, comprising a sludge-water separation zone and an integrally connected sludge recirculation zone. An outlet pipe is connected to the sludge-water separation zone for separating and discharging aged sludge.

[0007] In some embodiments, the sludge return and separation module includes multiple baffles arranged in parallel and integrally connected, with cavities between adjacent baffles to form the sludge separation zone; multiple wedge plates are provided on at least one outer side of the integrally connected baffles, and the wedge plates are located on the lower side of the baffles, thereby forming a sludge return zone on the side of the baffles.

[0008] In some embodiments, the plurality of wedge-shaped plates are evenly spaced and vertically distributed on the outer side of the baffle.

[0009] In some embodiments, the baffle cavity of the mud-water separation zone is connected to the water outlet pipe, which is connected to the top of the baffle and located above the wedge plate.

[0010] In some embodiments, the baffle is fixed inside the reactor by a modular support.

[0011] In some embodiments, the second part is provided with a water inlet pipe, which extends into the second part of the reactor through a water distribution branch pipe located below the perforated plate; a microporous aeration disc is also provided below the water distribution branch pipe.

[0012] In some embodiments, the aeration disc is also connected to a blower, which is communicatively connected to an ORP measuring instrument used for detecting wastewater for signal interlocking.

[0013] In some embodiments, the water distribution branch pipe is provided with an opening, and the opening is oriented toward the microporous aeration disc at the bottom.

[0014] In some embodiments, the openings of the water distribution branch pipe are located directly below the pipe and at a 45° angle to both sides directly below it.

[0015] In some embodiments, the first packing material is a cage-like packing material, and the second packing material is an iron-based cage-like packing material.

[0016] Beneficial effects:

[0017] 1) The reactor of this utility model is divided into two reaction zones by a perforated plate. The bacterial strains are fixed by packing material, so that the bacterial strains in the two reaction zones are isolated. The reaction conditions in the two zones are controlled separately, so that the dominant bacterial strains can grow more stably and the overall system's resistance to shock loads is improved.

[0018] 2) This utility model greatly improves the settling properties of sludge by fixing the bacterial strains with packing material, thereby increasing the upward flow velocity in the reactor and shortening the hydraulic retention time of the reactor, thus improving the wastewater treatment efficiency. At the same time, the high settling properties greatly reduce the burden on the sludge-water return and separation modules, reducing the risk of sludge runoff in the effluent.

[0019] 3) Compared with the traditional nitrification and denitrification methods, this invention controls the ORP of the wastewater in the reaction zone by interlocking the blower with a precise ORP measuring instrument. This can control the proportion of ammonia nitrogen to nitrite nitrogen in the water, while reducing the required aeration volume. Furthermore, the anaerobic ammonia oxidation reaction in the second part reduces the carbon source requirements of traditional denitrification.

[0020] 4) The iron-based packing material in this invention can promote the growth of anaerobic ammonia-oxidizing red bacteria, and the anaerobic ammonia-oxidizing red bacteria can recover more quickly when subjected to load shock. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the reactor of this utility model.

[0023] Figure 2 This is a schematic diagram of the water distribution branch pipe in the reactor of this utility model.

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of the branch pipe at point A.

[0025] Figure 4 This is a schematic diagram of the structure of the microporous aeration disc of this utility model.

[0026] The meanings of the symbols marked in the figure are as follows:

[0027] 1-Reactor; 2-Perforated plate; 3-First part; 30-Inlet pipe; 31-Water distribution branch pipe; 32-Microporous aeration disc; 33-ORP measuring instrument; 4-Second part; 40-Sludge-water return and separation module; 400-Baffle; 401-Wedge plate; 5-Outlet pipe; 6-Module support. Detailed Implementation

[0028] The present invention will be further explained in detail below with reference to the accompanying drawings and specific embodiments. However, the following description of the embodiments is only intended to enable those skilled in the art to better understand the principles and essence of the present invention, and does not imply any limitation on the present invention.

[0029] In the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should be noted that the following embodiments can be freely combined as needed. It should be pointed out that those skilled in the art can make several improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

[0030] This invention provides a reactor that integrates short-cut nitrification and anaerobic ammonium oxidation. By isolating the microbial species in the short-cut nitrification and anaerobic ammonium oxidation reaction zones, it promotes efficient nitrogen removal from wastewater.

[0031] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, to facilitate understanding, some drawings only schematically depict, or only label, parts with the same structure or function.

[0032] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or sets.

[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] refer to Figure 1 This is a short-cut nitrification coupled with anaerobic ammonium oxidation integrated reactor. The reactor 1 is equipped with a perforated plate 2, with a first part 3 for short-cut nitrification and a second part 4 for anaerobic ammonium oxidation distributed on the upper and lower sides of the perforated plate 2, respectively. The first part 3 contains sludge with nitrifying bacteria attached to a first packing material to fix aerobic bacteria, and the first part 3 is connected to an aeration source. The second part 4 contains anaerobic ammonium oxidation bacteria fixed by a second packing material. The size of the packing material is larger than that of the perforated plate 2. The second part 4 is equipped with a sludge-water return and separation module 40, which includes a sludge-water separation zone and an integrally connected sludge return zone. The sludge-water separation zone is connected to an outlet pipe 5 for separating and discharging aged sludge.

[0036] Based on this embodiment, within reactor 1, a first section 3 is formed on the upper and lower sides of a perforated plate 2, serving as a short-cut nitrification reaction zone, and a second section 4 is formed as an anaerobic ammonia oxidation reaction zone. The sludge participating in the reaction in the lower short-cut nitrification reaction zone is mainly nitrifying bacterial sludge. The microorganisms, i.e., the sludge, attach to the first packing material through extracellular polymers and grow. They are also retained in the working area along with the first packing material, keeping aerobic bacteria in the aerobic zone and anaerobic bacteria in the anaerobic zone. Since the anaerobic ammonia oxidizing bacteria mentioned above are strictly anaerobic, the aerobic environment in the lower part can be toxic to the bacteria, leading to bacterial deflocculation. Dividing the working area by the perforated plate 2 effectively protects the fragile anaerobic bacteria, fixing the bacterial species in their inherent reaction zones, thus allowing for the cultivation and screening of dominant bacterial species within each zone. After the oxygen is consumed in the short-cut nitrification zone, the upper area achieves a strictly anaerobic environment. At the same time, a large amount of ammonia nitrogen in the wastewater is converted into nitrite nitrogen, providing sufficient nutrients for the anaerobic ammonia-oxidizing red bacteria. The anaerobic ammonia-oxidizing red bacteria are fixed in the second packing material. At this point, the wastewater, carrying sludge and the second packing material, rises to the top of reactor 1 and enters the sludge-water separation zone of the sludge-water return and separation module 40. In the sludge-water separation zone, the active anaerobic ammonia-oxidizing sludge is fixed in the second packing material and has good settling properties. It returns from the sludge return zone to the anaerobic ammonia oxidation reaction zone, while the aged sludge falls off and becomes flocculent sludge with poor settling properties, leaving the system with the effluent pipe 5. This makes the anaerobic ammonia-oxidizing bacteria the dominant species fixed on the second packing material.

[0037] In one embodiment, the mud-water recirculation and separation module 40 includes a plurality of baffles 400 arranged in parallel and integrally connected, with cavities between adjacent baffles to form the mud-water separation zone; at least one outer surface of the integrally connected baffles 400 (e.g. Figure 1 Multiple wedge plates 401 are provided on the outermost side (as shown), and the wedge plates 401 are located on the lower side of the baffle 400, thereby forming a sludge return zone on the side of the baffle 400.

[0038] According to this embodiment, the sludge return zone and the sludge-water separation zone are integrated and vertically distributed. Wastewater treated at the top of the sludge-water return and separation module 40 enters the module through the cavity between the baffles 400. The regularly distributed baffles 400 in the sludge-water separation zone cause the packing material to fall into the return zone as it passes through the baffles 400, returning to the reaction zone. Meanwhile, the wastewater overflows upwards within the cavity of the baffles 400 to the effluent weir and enters the effluent pipe 5. Furthermore, aged sludge, having lost its extracellular polymeric ability, detaches from the packing material and is carried upwards by air and water; its poor settling properties cause it to leave the reactor 1 with the effluent. Thus, the sludge return zone and the sludge-water separation zone within the sludge-water return and separation module 40 work together to retain the packing material and well-formed sludge, while simultaneously increasing the upward flow velocity within the reactor 1. This increased upward flow velocity correspondingly increases the hydraulic load and pollutant treatment load of the reactor. To promote sludge return, the radial dimension of the packing material is larger than the spacing between the baffles 400. This controls the packing material to prevent it from falling directly into the mud-water separation zone from the spacing between the baffles 400. Instead, it flows out from the outer side of the baffles 400 to the sludge return zone, which can better retain the packing material and the sludge with good properties, thereby improving the wastewater treatment effect.

[0039] In one embodiment, the plurality of wedge-shaped plates 410 are evenly spaced and vertically distributed on the outer surface of the baffle 400. Based on this, the backflow process of the second portion of sewage can be enhanced, promoting the upward velocity of the sewage.

[0040] To ensure stable operation of the reactor, the baffle cavity of the sludge-water separation zone 400 is connected to the effluent pipe 5, which is connected to the top of the baffle and located above the wedge plate 410. Thus, the aged sludge in the sludge-water separation zone 400, due to its poor settling properties, is carried upwards by air and water and discharged through the upper effluent pipe 5. Normally, the baffle 400 is fixed inside the reactor 1 by the module support 6.

[0041] refer to Figure 2 In another embodiment, the second part 3 is provided with a water inlet pipe 30, which extends into the second part 3 of the reactor 1 through a water distribution branch pipe 31, which is located below the perforated plate 2. (Reference) Figure 4 A microporous aeration disc 32 is also provided below the water distribution branch pipe 31. Based on this, sewage is sent to the reactor 1 through the inlet pipe 30, and water is evenly distributed into the reactor 1 through the water distribution branch pipe 31. At the same time as water distribution, the risk of clogging of the microporous aeration disc 32 is reduced by the water flow impact.

[0042] In addition, the aeration disc 32 is also connected to a blower (not shown in the figure); the blower is communicatively connected to an ORP measuring instrument used for detecting wastewater for signal interlocking. Thus, the aeration disc 32, connected to the blower, introduces fine air bubbles into the lower part of reactor 1. The amount of air introduced is controlled by the ORP measuring instrument 33 to control the blower frequency, maintaining the influent ORP at the short-range nitrification ORP state. This ensures that abundant nitrite nitrogen accumulates in the lower part of reactor 1, providing sufficient nutrients for anaerobic ammonia oxidation in the upper reaction zone. ORP refers to oxidation-reduction potential.

[0043] refer to Figure 3 This diagram shows the perforation layout of the water distribution branch pipe 31 along its length. The water distribution branch pipe 31 has perforations, with the perforations facing the bottom microporous aeration disc 3. This reduces the risk of clogging of the microporous aeration disc 32 through water flow impact during water distribution. Preferably, as shown... Figure 3 As shown, the openings of the water distribution branch pipe 31 are located directly below the pipe and at a 45° angle to both sides of the directly below pipe. More specifically, the openings of the water distribution branch pipe 31 are evenly spaced along its length. Thus, the outlet of the water distribution branch pipe 2 can be directly opposite the microporous aeration disc 3 at the bottom of the reactor. The direct water flow impact during water distribution further effectively reduces the risk of clogging of the microporous aeration disc 32 and improves its service life.

[0044] In the above embodiments, the first packing material is a cage-like packing material, and the second packing material is an iron-based cage-like packing material. Thus, when treating wastewater in the integrated reactor, the nitrogen generated during aeration or anaerobic ammonia oxidation carries the AnAOB anaerobic ammonia oxidizing bacteria to the surface and leaves the reactor with the effluent. The packing material then serves to fix the sludge. Commonly used cage-like packing materials are made of HDPE and can be used in the lower aerobic zone, while the upper anaerobic zone uses iron-based packing material. Iron-based packing material can reduce the oxygen not fully utilized in the aerobic zone with zero-valent iron, ensuring an anaerobic environment for the sludge. The oxidized iron ions are a core element in the formation of heme, significantly promoting the growth and metabolism of anaerobic ammonia oxidizing bacteria. Simultaneously, the relatively high density of iron-based packing improves settling performance and increases the reactor's treatment capacity. It should be noted that the iron-based packing material is a commercially available packing material.

[0045] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A short-range nitrification coupled with anaerobic ammonium oxidation integrated device, characterized in that, The integrated device includes a reactor with a perforated plate. The upper and lower sides of the perforated plate are respectively divided into a first section for short-cut nitrification and a second section for anaerobic ammonia oxidation. The first section contains sludge with nitrifying bacteria attached to a first packing material to immobilize aerobic bacteria, and is connected to an aeration source. The second section contains anaerobic ammonia oxidation bacteria immobilized by a second packing material. The size of the packing material is larger than the perforation size of the perforated plate. The second section includes a sludge-water recirculation and separation module, which includes a sludge-water separation zone and an integrally connected sludge recirculation zone. The sludge-water separation zone is connected to an outlet pipe for separating and discharging aged sludge.

2. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 1, characterized in that, The sludge return and separation module includes multiple baffles arranged in parallel and integrally connected, with cavities between adjacent baffles to form the sludge separation zone; multiple wedge plates are provided on at least one outer side of the integrally connected baffles, and the wedge plates are located on the lower side of the baffles, thereby forming a sludge return zone on the side of the baffles.

3. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 2, characterized in that, The multiple wedge-shaped plates are evenly spaced and vertically distributed on the outer side of the baffle.

4. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 2, characterized in that, The baffle cavity of the mud-water separation zone is connected to the water outlet pipe, which is connected to the top of the baffle and located above the wedge plate.

5. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 2, characterized in that, The baffle is fixed inside the reactor by a modular bracket.

6. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 1, characterized in that, The second part is provided with a water inlet pipe, which extends into the second part of the reactor through a water distribution branch pipe, which is located below the perforated plate; a microporous aeration disc is also provided below the water distribution branch pipe.

7. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 6, characterized in that, The aeration disc is also connected to a blower, which is communicatively connected to an ORP measuring instrument used to detect wastewater.

8. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 6, characterized in that, The water distribution branch pipe is provided with an opening, and the opening is oriented towards the microporous aeration disc at the bottom.

9. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 8, characterized in that, The openings of the water distribution branch pipes are located directly below the main pipe and at a 45° angle to both sides directly below it.

10. The integrated short-range nitrification coupled with anaerobic ammonium oxidation device according to claim 1, characterized in that, The first packing material is a cage-shaped packing material, and the second packing material is an iron-based cage-shaped packing material.

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