A device for treating high-ammonia-nitrogen organic wastewater

Abstract

The present application relates to a kind of high ammonia nitrogen organic wastewater treatment device, comprising: coagulation air floatation device, aerobic pretreatment device, precipitation device, denitrification device, first ultrafiltration membrane device, anaerobic ammonia oxidation device, A / O biochemical device, second ultrafiltration membrane device and electrocatalytic device in series connection in wastewater treatment flow direction in order;Through the cooperation of each device in series connection along wastewater treatment flow direction, the complete treatment system of "pretreatment-multistage biochemical denitrification-depth purification" is constructed, the water quality characteristics of high ammonia nitrogen, low carbon nitrogen ratio organic wastewater are accurately matched, the pain points such as high cost, large carbon emission and incomplete denitrification of traditional treatment process are effectively solved, and the efficient, economic, low-carbon wastewater treatment goal is realized.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a device for treating high ammonia nitrogen organic wastewater. Background Technology

[0002] High-ammonia-nitrogen organic wastewater is widely generated in industrial production, agricultural activities, and the operation of municipal facilities such as kitchen waste treatment plants, landfills, and waste incineration plants. A significant characteristic of this type of wastewater is its scarcity of carbon sources, making it generally difficult to meet the requirements of traditional nitrification-denitrification biological nitrogen removal processes. To ensure effective nitrogen removal, large amounts of external carbon sources need to be added to the wastewater, which not only leads to high nitrogen removal costs but also increases carbon emissions. Therefore, developing new low-cost, low-carbon-emission nitrogen removal technologies has become an urgent need for the industry.

[0003] Among them, kitchen waste wastewater is a typical high-ammonia nitrogen, high-concentration organic wastewater, with a total nitrogen (TN) concentration reaching 2000–3000 mg / L and ammonia nitrogen (TN) concentration of 2000–3000 mg / L. The concentration was 1500–2500 mg / L, and the carbon-to-nitrogen ratio was ( The carbon-to-nitrogen ratio (C / N ratio) is extremely low, only 2:1 to 3:1, which further exacerbates the difficulty of effectively removing total nitrogen. Traditional biological denitrification of high ammonia nitrogen wastewater generally adopts the nitrification-denitrification process. This process requires the carbon-to-nitrogen ratio in the wastewater to be greater than 4 to ensure stable denitrification effect. Therefore, it is only suitable for wastewater treatment scenarios with a high carbon-to-nitrogen ratio.

[0004] For high-ammonia-nitrogen organic wastewater with a low carbon-to-nitrogen ratio, such as kitchen waste wastewater and landfill leachate, traditional nitrification-denitrification processes require the continuous addition of large amounts of external carbon sources, resulting in high treatment costs and increased carbon emissions. These excessively high treatment costs and carbon emissions severely hinder the advancement of projects for the resource utilization of high-ammonia-nitrogen organic wastewater. The industry urgently needs to develop new treatment processes and supporting equipment that can achieve stable discharge compliance, low treatment costs, and low carbon emissions.

[0005] Anaerobic ammonia oxidation (AAO) technology, as a novel autotrophic biological nitrogen removal technology, breaks through the limitations of traditional biological nitrogen removal processes and has significant advantages: it can reduce power consumption by more than 60%, reduce carbon dioxide emissions by 90%, and requires no addition of organic carbon sources. With its core advantages of low cost and low carbon emissions, it provides a new technical approach for efficient and low-cost nitrogen removal from high-ammonia nitrogen wastewater, becoming one of the most active research directions in the field of biological nitrogen removal in recent years. Furthermore, autotrophic biological nitrogen removal technology not only achieves efficient nitrogen removal but also directly reduces... , It can reduce carbon emissions through fugitive emissions, as well as indirect carbon emissions related to electricity and pharmaceutical consumption, and has broad application prospects for achieving carbon emission reduction targets.

[0006] However, practice has shown that standalone anammox devices are insufficient to treat high-ammonia-nitrogen organic wastewater to meet discharge standards, failing to meet actual treatment needs. To fully leverage the advantages of anammox technology and achieve low-cost, high-efficiency denitrification of high-ammonia-nitrogen organic wastewater, it is necessary to organically combine anammox devices with other process units to form a synergistic treatment system. Based on the shortcomings of existing technologies, there is an urgent need to develop a high-ammonia-nitrogen organic wastewater treatment device that is highly adaptable, has high treatment efficiency, low cost, and low carbon emissions, in order to address the current pain points in the industry. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a high ammonia nitrogen organic wastewater treatment device, comprising: a coagulation and flotation device, an aerobic pretreatment device, a sedimentation device, a denitrification device, a first ultrafiltration membrane device, an anaerobic ammonia oxidation device, an A / O biochemical device, a second ultrafiltration membrane device, and an electrocatalytic device connected in series along the wastewater treatment flow direction.

[0008] The coagulation and flotation unit is used to remove suspended particulate matter, grease, and some colloidal impurities from wastewater; its effluent end is connected to the influent end of the aerobic pretreatment unit. The aerobic pretreatment unit is used to degrade some easily degradable organic pollutants in the wastewater and achieve preliminary nitrification of ammonia nitrogen; its effluent end is connected to the influent end of the sedimentation unit. The sedimentation unit is used to separate the activated sludge produced after aerobic pretreatment; its effluent end is connected to the influent end of the denitrification unit. The denitrification unit is used to reduce nitrate nitrogen in the wastewater to nitrogen gas; its effluent end is connected to the influent end of the ultrafiltration membrane unit. The first ultrafiltration membrane unit is used to retain microorganisms generated during the denitrification process. The first anaerobic ammonia oxidation unit (A / O) is used to convert ammonia nitrogen and nitrite nitrogen in wastewater into nitrogen gas. Its effluent is connected to the influent of the A / O biological treatment unit. The second A / O biological treatment unit is used to further remove residual nitrogen and organic pollutants from the wastewater. Its effluent is connected to the influent of the ultrafiltration membrane unit. The third ultrafiltration membrane unit is used to retain activated sludge and impurities generated during the A / O biological treatment process. Its effluent is connected to the influent of the electrocatalytic unit. The fourth electrocatalytic unit is used to deeply degrade residual recalcitrant organic pollutants in the wastewater to ensure that the effluent meets discharge standards.

[0009] Furthermore, the internal cavity of the coagulation-flotation device is equipped with a skimming mechanism, a scum tank, and a dissolved air release mechanism; the flotation inlet pipe and the flotation outlet pipe are respectively connected to the internal cavity of the flotation device, and the flotation outlet pipe is connected to the outlet of the flotation device and the inlet of the aerobic pretreatment device; the scum discharge pipe is connected to the scum tank and a separate sludge storage tank, and the sludge generated by the coagulation-flotation device is discharged into the separate sludge storage tank; coagulant is added to the coagulation-flotation device by an external coagulant addition component, coagulates with the wastewater, and then achieves solid-liquid separation through flotation to remove pollutants from the wastewater.

[0010] Furthermore, the inner cavity of the aerobic pretreatment device contains activated sludge mixture and is equipped with an aerobic aeration device connected to an external blower. The first connecting pipe connects the outlet at the top of the aerobic pretreatment device and the inlet at the top of the sedimentation device.

[0011] Furthermore, the sedimentation device adopts a gravity sedimentation tank to separate the solid and liquid in the effluent from the aerobic pretreatment device. The second connecting pipe connects the supernatant outlet of the sedimentation device and the inlet of the denitrification device, transporting the supernatant from the sedimentation device to the denitrification device. The third connecting pipe connects the sludge discharge outlet to a separate sludge storage tank. The sludge generated by the sedimentation device is not returned and is discharged entirely into the separate sludge tank.

[0012] Furthermore, the denitrification device is equipped with a stirring mechanism inside its cavity; the inlet of the denitrification device is connected to the outlet of the supernatant of the sedimentation tank and the outlet of the effluent circulation pump of the anaerobic ammonia oxidation device, so that the nitrates and nitrites contained in the effluent of the sedimentation device and the return liquid of the anaerobic ammonia oxidation device are removed by denitrification; the effluent of the denitrification device enters the first ultrafiltration membrane device through the first ultrafiltration inlet pump.

[0013] Furthermore, the first ultrafiltration membrane device includes a first ultrafiltration feed pump, a first ultrafiltration membrane module, a fourth connecting pipe connecting the inner cavity of the denitrification device and the inlet of the first ultrafiltration feed pump, a fifth connecting pipe connecting the outlet of the ultrafiltration feed pump and the first inlet of the first ultrafiltration membrane module, a sixth connecting pipe connecting the sludge return interface of the first ultrafiltration membrane module and the inner cavity of the denitrification device, and a seventh connecting pipe connecting the product water interface of the ultrafiltration membrane module and the inlet of the anaerobic ammonia oxidation device, thus entering the anaerobic ammonia oxidation device.

[0014] Furthermore, the anaerobic ammonia oxidation device includes: an outer cylinder, an inner cylinder, a flow guiding device, a flow propulsion device, an aeration device, and a crushing device;

[0015] The outer and inner cylinders form a reaction chamber;

[0016] The flow guiding device includes a two-stage housing with an internal through-filling cavity, and a sieve hole is provided at the upper end of the housing;

[0017] A flow propulsion device is installed inside the sieve holes;

[0018] The aeration device is installed inside the through hole and located below the flow propulsion device;

[0019] The crushing and screening device is located below the flow guiding device.

[0020] Furthermore, a branch pipe is installed in the effluent pipe of the anaerobic ammonia oxidation unit, and the pipe is connected to the inlet of the return pump. A portion of the effluent from the anaerobic ammonia oxidation unit is returned to the inlet pipe of the denitrification unit through the pipe. The ratio of the return flow rate to the effluent flow rate of the sedimentation unit is 50% to 200%. The other portion of the effluent from the anaerobic ammonia oxidation unit is transported to the anoxic zone of the A / O biological treatment unit through the pipe.

[0021] Furthermore, the A / O biological treatment device includes an anoxic zone, an aerobic zone, and an internal reflux pump; the anoxic zone is equipped with a stirring mechanism, the top of which is connected to the aerobic zone, and the aerobic zone is equipped with an aeration mechanism connected to an external blower; the outlet pipe of the internal reflux pump is connected to the anoxic zone, and the A / O inlet pipe is connected to the aerobic zone, so as to transport the activated sludge mixture in the aerobic zone to the anoxic zone.

[0022] Furthermore, the second ultrafiltration membrane device includes a second ultrafiltration feed pump, a second ultrafiltration membrane module, a ninth connecting pipe connecting the inner cavity of the aerobic zone and the inlet of the second ultrafiltration feed pump, a tenth connecting pipe connecting the outlet of the ultrafiltration feed pump and the second inlet of the second ultrafiltration membrane module, an eleventh connecting pipe connecting the sludge return interface of the second ultrafiltration membrane module and the inner cavity of the aerobic zone, a twelfth connecting pipe connecting the product water interface of the ultrafiltration membrane module and the inlet of the electrocatalytic device, and the excess sludge is discharged through the excess sludge discharge port of the ultrafiltration membrane device to a separately provided sludge storage tank via a pipeline;

[0023] The electrocatalytic device includes a rectangular shell with an inner cavity, a top cover connected to the upper part of the shell, an anode plate and a cathode plate arranged alternately at a certain interval inside the shell, an insulating frame that does not contact the anode and cathode plates is provided between the anode and cathode plates, and the interior is filled with particle electrodes.

[0024] This invention provides a high ammonia nitrogen organic wastewater treatment device. By connecting various devices in series along the wastewater treatment flow direction, a complete treatment system of "pretreatment-multi-stage biochemical denitrification-deep purification" is constructed. This system accurately matches the water quality characteristics of high ammonia nitrogen and low carbon-to-nitrogen ratio organic wastewater, effectively solving the pain points of traditional treatment processes such as high cost, large carbon emissions, and incomplete denitrification, and achieving the goal of efficient, economical, and low-carbon wastewater treatment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the high ammonia nitrogen organic wastewater treatment device of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of one embodiment of the anaerobic ammonia oxidation device of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal flow guiding device of the anaerobic ammonia oxidation device of the present invention.

[0028] Figure 4 This is a schematic diagram of another embodiment of the internal flow guiding device of the anaerobic ammonia oxidation device of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal flow propulsion device of the anaerobic ammonia oxidation apparatus of the present invention.

[0030] Figure 6 This is a top view of an embodiment of the internal flow propulsion device of the anaerobic ammonia oxidation apparatus of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of an embodiment of the internal crushing device of the anaerobic ammonia oxidation unit of the present invention;

[0032] Figure 8 This is a top view of an embodiment of the internal crushing device of the anaerobic ammonia oxidation apparatus of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., these directional indications are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. Furthermore, if the embodiments of the present invention involve descriptions such as "first," "second," "S1," "S2," "step one," "step two," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance, or implicitly indicating the number of technical features indicated or the order of method execution. Those skilled in the art will understand that anything that does not violate the inventive concept and is within the scope of the present invention should be included in the protection scope of the present invention.

[0035] like Figure 1 As shown, the present invention provides a high ammonia nitrogen organic wastewater treatment device, comprising: a coagulation flotation device (1), an aerobic pretreatment device (2), a sedimentation device (3), a denitrification device (4), a first ultrafiltration membrane device (5), an anaerobic ammonia oxidation device (6), an A / O biochemical device (7), a second ultrafiltration membrane device (8), and an electrocatalytic device (9) connected in series along the wastewater treatment flow direction.

[0036] The coagulation and flotation unit is used to remove suspended particulate matter, grease, and some colloidal impurities from wastewater; its effluent end is connected to the influent end of the aerobic pretreatment unit. The aerobic pretreatment unit is used to degrade some easily degradable organic pollutants in the wastewater and achieve preliminary nitrification of ammonia nitrogen; its effluent end is connected to the influent end of the sedimentation unit. The sedimentation unit is used to separate the activated sludge produced after aerobic pretreatment; its effluent end is connected to the influent end of the denitrification unit. The denitrification unit is used to reduce nitrate nitrogen in the wastewater to nitrogen gas; its effluent end is connected to the influent end of the ultrafiltration membrane unit. The first ultrafiltration membrane unit is used to retain microorganisms generated during the denitrification process. The first anaerobic ammonia oxidation unit (A / O) is used to convert ammonia nitrogen and nitrite nitrogen in wastewater into nitrogen gas. Its effluent is connected to the influent of the A / O biological treatment unit. The second A / O biological treatment unit is used to further remove residual nitrogen and organic pollutants from the wastewater. Its effluent is connected to the influent of the ultrafiltration membrane unit. The third ultrafiltration membrane unit is used to retain activated sludge and impurities generated during the A / O biological treatment process. Its effluent is connected to the influent of the electrocatalytic unit. The fourth electrocatalytic unit is used to deeply degrade residual recalcitrant organic pollutants in the wastewater to ensure that the effluent meets discharge standards.

[0037] In this embodiment, a high-ammonia nitrogen organic wastewater treatment device of the present invention is presented. Through the coordinated operation of devices connected in series along the wastewater treatment flow direction, a complete treatment system of "pretreatment - multi-stage biological denitrification - deep purification" is constructed. This system precisely matches the water quality characteristics of high-ammonia nitrogen and low carbon-to-nitrogen ratio organic wastewater, effectively solving the pain points of traditional treatment processes such as high cost, large carbon emissions, and incomplete denitrification. It achieves the goal of efficient, economical, and low-carbon wastewater treatment. Specific technical effects are as follows:

[0038] 1. Improve the quality and efficiency of the pretreatment process to ensure the stable operation of subsequent processes: The coagulation and flotation device (1) can efficiently remove suspended particulate matter, oil and some colloidal impurities in wastewater. On the one hand, it avoids oil and impurities from adhering to the packing surface of the subsequent biochemical device and causing blockage, reducing the risk of membrane module pollution and extending the service life of the equipment; on the other hand, it can reduce the inhibitory effect of oil on microbial activity and create good conditions for subsequent biochemical reactions. The aerobic pretreatment device (2) degrades some easily degradable organic pollutants in wastewater by aeration and oxygen supply, and at the same time completes the preliminary nitrification of ammonia nitrogen, converting some ammonia nitrogen into nitrate nitrogen, providing substrate for the subsequent denitrification process and improving the overall denitrification efficiency; the sedimentation device (3) can effectively separate the activated sludge produced by the aerobic pretreatment, avoid the sludge from entering the denitrification device (4) and causing the reaction system to be disordered, ensure the stable progress of the denitrification reaction, and further optimize the influent water quality.

[0039] 2. Multi-stage biochemical denitrification works synergistically to achieve efficient nitrogen removal and low carbon emission reduction: This device breaks through the dependence of traditional nitrification-denitrification processes on carbon sources through a multi-stage synergistic denitrification design consisting of a denitrification unit (4), an anaerobic ammonia oxidation unit (6), and an A / O biochemical unit (7). Among them, the denitrification unit (4) can reduce the nitrate nitrogen produced by the initial nitrification to nitrogen gas, achieving the initial removal of nitrogen and reducing the load of subsequent treatment; the anaerobic ammonia oxidation unit (6) is the core denitrification unit, which uses autotrophic microorganisms to directly convert ammonia nitrogen and nitrite nitrogen in wastewater into nitrogen gas without the need to add external carbon sources, which greatly reduces the cost of adding carbon sources and reduces carbon emissions caused by adding carbon sources. Compared with traditional processes, it can reduce power consumption by more than 60% and carbon dioxide emissions by 90%, which significantly improves the economy and low carbon emissions of the treatment process. The A / O biological treatment unit (7) further removes residual nitrogen and organic pollutants from the wastewater, making up for the incomplete treatment of the single anaerobic ammonia oxidation unit and ensuring that the nitrogen removal rate meets the standards. In addition, the first ultrafiltration membrane unit (5) and the second ultrafiltration membrane unit (8) are respectively set after the denitrification unit (4) and the A / O biological treatment unit (7), which can effectively intercept the microorganisms and unsettled impurities generated during the reaction process, avoid the loss of microorganisms and the resulting decrease in reaction efficiency, and at the same time ensure the stability of the influent water quality of the subsequent units and improve the shock load resistance of the entire treatment system.

[0040] 3. Advanced treatment ensures effluent meets standards and improves water quality safety: The electrocatalytic device (9), as the final advanced treatment unit, utilizes advanced oxidation technology to efficiently degrade recalcitrant organic pollutants that failed to be removed by previous processes. Simultaneously, it further removes residual trace nitrogen and other pollutants, ensuring that the final effluent's COD, ammonia nitrogen, total nitrogen, and other indicators consistently meet emission standards. This design solves the problem of water quality exceeding standards that easily occurs after the treatment of high-ammonia-nitrogen organic wastewater, providing a guarantee for the resource utilization of wastewater and broadening the application scenarios of the device.

[0041] 4. Strong overall process adaptability and stable and reliable operation: The entire system is designed for the water quality characteristics of high ammonia nitrogen and low carbon-to-nitrogen ratio organic wastewater (such as kitchen waste wastewater and landfill leachate). The functions of each unit are complementary and the treatment chain is smoothly connected, which can adapt to the treatment needs of high ammonia nitrogen organic wastewater with different concentrations. The system does not require large-scale addition of chemical reagents during operation, is easy to operate, and has low maintenance costs. It effectively solves the industry pain points of high cost, large carbon emissions, and unstable treatment effects of traditional processes for treating such wastewater, and has broad prospects for industrial application.

[0042] Preferred:

[0043] The coagulation-flotation device 1 has an internal cavity equipped with a skimming mechanism 11, a scum tank 12, and a dissolved air release mechanism 13. The flotation inlet pipe and flotation outlet pipe 16 are connected to the internal cavity of the flotation device, and the outlet pipe 16 connects the outlet of the flotation device to the inlet of the aerobic pretreatment device 2. The scum discharge pipe 15 connects the scum tank 12 to a separate sludge storage tank, discharging the sludge generated by the coagulation-flotation device into the separate sludge storage tank. Coagulant is added to the coagulation-flotation device 1 via an external coagulant addition component, coagulates with the wastewater, and then achieves solid-liquid separation through flotation, removing pollutants such as COD, TP, and suspended solids from the wastewater.

[0044] The aerobic pretreatment device 2 contains activated sludge mixture and is equipped with aerobic aeration components connected to an external blower. The first connecting pipe 22 connects the outlet at the top of the aerobic pretreatment device 2 and the inlet at the top of the sedimentation device 3. Preferably, the aerobic pretreatment device 2 employs a high-load activated sludge process with no sludge backflow. The hydraulic retention time (HRT) and sludge retention time (SRT) are equal, ranging from 1 to 3 days. This removes COD and BOD5 from the wastewater, reducing COD and BOD in the wastewater entering the subsequent anaerobic ammonia oxidation device 6. Taking the treatment of anaerobic digestate wastewater from kitchen waste as an example, this embodiment uses 1.5 days. By controlling the sludge retention time to not exceed the generation cycle of nitrite-oxidizing bacteria, the enrichment of nitrite-oxidizing bacteria inside the reactor is avoided, thus preventing nitrate accumulation inside the reactor. During operation, the aerobic aeration unit mixes the sludge and wastewater evenly through aeration and replenishes the mixed liquid with oxygen. Under the action of microbial metabolism, COD and BOD5 in the wastewater are removed, reducing the COD and BOD in the wastewater entering the subsequent anaerobic ammonia oxidation unit 6.

[0045] The sedimentation device 3 uses a gravity sedimentation tank to separate the solid and liquid in the effluent from the aerobic pretreatment device 2. The second connecting pipe 32 connects the supernatant outlet of the sedimentation device and the inlet of the denitrification device 4, transporting the supernatant of the sedimentation device 3 to the denitrification device 4. The third connecting pipe 31 connects the sludge discharge outlet to a separate sludge storage tank. The sludge produced by the sedimentation device 3 is not returned and is discharged into the separate sludge tank.

[0046] The denitrification unit 4 is equipped with a stirring mechanism 41 inside its cavity. The inlet of the denitrification unit 4 is connected to the outlet of the supernatant from the sedimentation tank and the outlet of the circulating pump from the anaerobic ammonia oxidation unit 6. This allows for the removal of nitrates and nitrites from the effluent from the sedimentation unit 3 and the return liquid from the anaerobic ammonia oxidation unit 6 through denitrification. The denitrification unit reduces total nitrogen in the effluent and consumes BOD in the influent to the anaerobic ammonia oxidation unit, thus lowering the carbon-to-nitrogen ratio. The denitrification unit 4 does not add an external carbon source; it utilizes the wastewater's own carbon sources (COD, BOD) to remove nitrate nitrogen, nitrite nitrogen, and BOD through denitrification. The effluent from the denitrification unit 4 enters the first ultrafiltration membrane unit 5 via the first ultrafiltration inlet pump 52.

[0047] The first ultrafiltration membrane device 5 includes a first ultrafiltration feed pump 52 and a first ultrafiltration membrane module 54. A fourth connecting pipe 51 connects the inner cavity of the denitrification device 4 and the inlet of the first ultrafiltration feed pump 52. A fifth connecting pipe 53 connects the outlet of the ultrafiltration feed pump and the first inlet 57 of the first ultrafiltration membrane module 54. A sixth connecting pipe 55 connects the sludge return interface of the first ultrafiltration membrane module 54 to the inner cavity of the denitrification device 4. A seventh connecting pipe 58 connects the permeate interface of the ultrafiltration membrane module to the inlet of the anaerobic ammonia oxidation device 6. Excess sludge is discharged through the excess sludge discharge port 56 of the ultrafiltration membrane device and into a separately provided sludge storage tank via an eighth connecting pipe 59. The first ultrafiltration membrane device performs solid-liquid separation on the effluent from the denitrification device 4, intercepting sludge, suspended solids, and some large molecular organic matter in the wastewater. The permeate separated by ultrafiltration enters the anaerobic ammonia oxidation device 6 through the seventh connecting pipe 58.

[0048] The anaerobic ammonia oxidation device 6 includes: an outer cylinder 61, an inner cylinder 62, a flow guiding device 63, a flow propulsion device 64, an aeration device 65, and a crushing device 66;

[0049] The outer and inner cylinders form a reaction chamber;

[0050] The flow guiding device includes a two-stage housing with an internal through-filling cavity, and a sieve hole is provided at the upper end of the housing;

[0051] A flow propulsion device is installed inside the sieve holes;

[0052] The aeration device is installed inside the through hole and located below the flow propulsion device;

[0053] The crushing and screening device is located below the flow guiding device.

[0054] Specifically: the outer cylinder 61 includes a first cylindrical body 611 containing an inner cavity and a first conical body 612 that is wider at the top and narrower at the bottom and closed at the bottom; the upper edge of the first conical body 612 has the same size as the lower edge of the first cylindrical body 611 and is connected as a whole; the upper part of the first cylindrical body 611 is provided with a denitrification outlet 613, and the bottom of the first conical body 612 is provided with a sludge discharge pipe 614; the denitrification inlet pipe 615 enters the inner cavity of the cylinder from the lower part of the first cylindrical body 611, passes through the second external inclined guide part 6312b of the guide device 63 and extends to the center of the inner cavity of the cylinder 61, and is located below the aeration device 65.

[0055] The inner cylinder 62 is a straight cylinder located at the upper part of the inner cavity of the first cylindrical body 611, and its height is 30%-70% of the height of the outer cylinder 61. The lower edge of the inner cylinder 62 has the same geometric dimensions as the upper edge of the flow guiding device 3 and is connected to it, forming a continuous cylinder with an inner cavity, extending to the lower edge of the inner cavity of the first cylindrical body 611. The continuous cylinder formed by the inner cylinder 62 and the flow guiding device 63 divides the inner cavity of the outer cylinder 61 into an inner reaction zone located inside and an outer reaction zone located outside and between the outer cylinder 1, and the inner and outer reaction zones are connected.

[0056] The flow guiding device 63 is a two-stage shell device with an internal through-cavity, comprising: a first inner inclined flow guiding shell 6311a with an inner cavity that is wider at the top and narrower at the bottom and open at both the top and bottom surfaces; a first outer inclined flow guiding shell 6312a with an inner cavity that is narrower at the top and wider at the bottom and open at both the top and bottom surfaces; a second inner inclined flow guiding shell 6311b with an inner cavity that is wider at the top and narrower at the bottom and open at both the top and bottom surfaces; and a second outer inclined flow guiding shell 6312b with an inner cavity that is narrower at the top and wider at the bottom and open at both the top and bottom surfaces. The lower edge geometric dimension D1 of the first inner inclined flow guiding shell 6311a is the same as the upper edge dimension of the first outer inclined flow guiding shell 6312a; the lower edge dimension D2 of the first outer inclined flow guiding shell 6312a is the same as the upper edge dimension of the second inner inclined flow guiding shell 6311b; and the lower edge dimension D3 of the second inner inclined flow guiding shell 6311b is the same as the upper edge dimension of the second outer inclined flow guiding shell 6312b. The upper edge dimensions of 312b are the same; the lower edge of shell 6311a, the upper edge of shell 6312a, the lower edge of shell 6312a, the upper edge of shell 6311b, the lower edge of shell 6311b, and the upper edge of shell 6312a are connected to form a through integral shell containing an inner cavity; the horizontal tilt angle θ1 of the first inner inclined guide shell is greater than the horizontal tilt angle θ2 of the second inner inclined guide shell; the horizontal tilt angle θ3 of the first outer inclined guide shell is less than the horizontal tilt angle θ4 of the second outer inclined guide shell; the upper edge dimension D0 of the first inner inclined guide shell is greater than the upper edge dimension D2 of the second inner inclined guide shell; the lower edge dimension D1 of the first inner inclined guide part is greater than the lower edge dimension D3 of the second inner inclined guide part; the lower edge dimension D4 of the second outer inclined guide part is greater than the upper edge dimension D0 of the first inner inclined guide part, and the dimensional relationship of each part is: D0 > D4 > D2 > D1 > D3. In this embodiment: 1m≤D0≤10m, 1 / 5D0≤D1≤1 / 2D0; more preferably, the included angle: 20≤θ1, θ2≤45 degrees; the lower horizontal included angle: 45≤θ3, θ4≤90 degrees;

[0057] The first inner inclined guide shell 6311a has a first screen hole 632a uniformly distributed along the circumference of the inclined surface; the second inner inclined guide shell 6311b has a second screen hole 632b uniformly distributed along the circumference of the inclined surface; the size of the first screen hole 632a is smaller than the size of the second screen hole 632b; the size of the second screen hole 632b is smaller than the lower edge dimension D3 of the second inner inclined guide part; the shape of the screen hole can be any one or more of the following: rectangular, elliptical, circular, and square; taking square and circular as examples, the width of the square hole of the first screen hole is 1mm≤b≤3mm, and the diameter of the circular hole is 1mm≤Φ≤3mm; the size of the second screen hole 632b is 1.5 to 2 times that of the first screen hole 632a, and more preferably, the flow velocity of the screen hole is 3≤v≤300m / h.

[0058] The lower part of the flow guiding device 63 is provided with a granular sludge retention regulator 634; the granular sludge retention regulator 634 is a ring structure with a ring width of 0.4m to 0.8m, and is vertically set at the middle of the outer side of the second outer inclined flow guiding part 6312b.

[0059] The flow propulsion device 64 is located below the inner cylinder 62 and above the inner cavity (inside) of the flow guiding device 63; as shown in the attached diagram. Figure 4-5 As shown, the propulsion device includes: a propulsion housing 641, a drive component 642, a propulsion main shaft 643, and propulsion impeller blades 644. The propulsion housing 642 is an inverted frustum-shaped cage-like shell with an open upper part, a closed lower part, and hollowed-out sides. The drive component 642 is installed on the lower bottom surface of the housing. The propulsion main shaft 643 is connected to the drive component 642, passes through the lower bottom surface from the center of the housing, and extends along the center line of the housing into the interior of the housing. The propulsion impeller blades 644 are installed on the propulsion main shaft 643. The propulsion housing is made of corrosion-resistant metal material and has a certain rigidity, which can withstand the weight of the propulsion device itself.

[0060] The aeration device 65 is located in the middle of the inner cavity of the second outer inclined guide shell 6312b of the flow guiding device 63, and is located below the flow stirring device 64 and above the crushing device 66. The aeration head of the aeration device adopts a swirling umbrella-shaped cutting aerator. The aeration head is maintenance-free and has a long service life. The aeration device is connected to an external blower through an air pipe 651.

[0061] The crushing device 66 is disposed inside the first conical cylinder 612 of the outer cylinder 61 and is located below the flow guiding device 63; the crushing device 66 includes: a frame 661, a driving component 662, a transmission shaft 663, a blade 664, and a screen 665.

[0062] The shell 661 is an inverted frustum-shaped shell that is open at both the top and bottom, wider at the top and narrower at the bottom. A screen 665 is installed on the bottom surface of the shell, with uniform mesh openings of 3mm in diameter. The upper part of the shell 661 is connected to the lower part of the second outer inclined guide shell 6312b of the flow guiding device 63. The sides and bottom surface of the shell are reinforced with ribs 6661 to enhance the rigidity of the shell. The drive component 662 is installed on the bottom surface of the shell. The drive shaft 663 connects to the drive component 662, passes through the center of the bottom surface of the shell, and extends along the center line of the shell to the outside of the shell. The paddle cutter 664 is installed on the drive shaft 663 on the outer side of the bottom of the shell and is located below the screen 665. The rotation diameter of the paddle cutter is equal to the diameter of the bottom surface of the shell 661. The shell is made of corrosion-resistant metal and has a certain rigidity, which can withstand the weight of the crushing device itself.

[0063] The continuous cylinder formed by the inner cylinder 62 and the flow guiding device 63, along with the flow guiding device 63, the flow pushing device 64, the aeration device 65, and the crushing device 66, divide the inner cavity of the outer cylinder 61 into multiple zones with different functions: the area above the impeller of the flow pushing device 64 in the inner cylinder is the inner reaction zone (aerobic reaction zone) 6B, and the area below the impeller and above the crushing device 66 is the mixing reaction zone 6F; the annular columnar channel formed by the outer side of the inner cylinder 62 and the inner side of the first columnar cylinder 611 is the outer downward flow channel 6C; the annular channel formed by the outer side of the flow guiding device 63 and the inner side of the first columnar cylinder 611 is the outer reaction zone 6D; and the area between the lower end of the crushing device 6 and the first conical cylinder 612 is the sludge particle conditioning zone 6E.

[0064] The effluent pipe of the anaerobic ammonia oxidation unit is provided with branch pipes 6c and 6d. Pipe 6c is connected to the inlet of the return pump 6b, and a portion of the effluent from the anaerobic ammonia oxidation unit is returned to the inlet pipe of the denitrification unit 4. The ratio of the return flow rate to the flow rate of the effluent from the sedimentation unit 3 is 50% to 200%. The other portion of the effluent from the anaerobic ammonia oxidation unit is transported to the anoxic zone 7a of the A / O biological treatment unit 7 through pipe 6d. In this embodiment, the ratio of the return flow rate to the denitrification unit 4 to the flow rate of the effluent from the sedimentation unit 3 is preferably 100%. The other portion of the effluent from the anaerobic ammonia oxidation unit is transported to the anoxic zone 71 of the A / O biological treatment unit 7 through pipe 6d.

[0065] The A / O biological treatment unit 7 includes an anoxic zone 71, an aerobic zone 72, and an internal reflux pump 74. The anoxic zone 71 is equipped with a stirring mechanism 77, the top of which is connected to the aerobic zone 72. The aerobic zone 72 is equipped with an aeration mechanism 76 connected to an external blower. The A / O outlet pipe 73 of the internal reflux pump 74 is connected to the anoxic zone 71, and the A / O inlet pipe 75 is connected to the aerobic zone 72, transporting the activated sludge mixture from the aerobic zone to the anoxic zone 71. The anoxic zone 71 mainly achieves denitrification biological nitrogen removal, while the aerobic zone 72 mainly achieves COD removal and ammonia nitrification. In the anoxic zone, a carbon source is added as needed based on the wastewater carbon-to-nitrogen ratio and total nitrogen discharge requirements.

[0066] The second ultrafiltration membrane device 8 performs ultrafiltration separation on the effluent from the A / O biological treatment device 7, intercepting sludge, suspended solids, and some large molecular organic matter in the wastewater. The ultrafiltration product water enters the electrocatalytic device 9 through a pipeline. The second ultrafiltration membrane device 8 includes a second ultrafiltration inlet pump 81, a second ultrafiltration membrane module 82, a ninth connecting pipe 83 connecting the inner cavity of the aerobic zone 72 and the inlet of the second ultrafiltration inlet pump 81, a tenth connecting pipe 84 connecting the outlet of the ultrafiltration inlet pump and the second inlet 85 of the second ultrafiltration membrane module 82, an eleventh connecting pipe 87 connecting the sludge return interface of the second ultrafiltration membrane module 82 and the inner cavity of the aerobic zone 72, and a twelfth connecting pipe 88 connecting the product water interface of the ultrafiltration membrane module and the inlet of the electrocatalytic device 9. The remaining sludge is discharged through the remaining sludge discharge port 86 of the ultrafiltration membrane device and discharged through a pipeline 89 to a separately provided sludge storage tank.

[0067] The electrocatalytic device 9 includes a rectangular shell 91 with an inner cavity, a top cover 92 connected to the upper part of the shell 91, an anode plate 93 and a cathode plate 94 inside the shell 91. The anode plate and cathode plate are arranged alternately at certain intervals inside the shell 91. An insulating frame 95 that does not contact the anode and cathode plates is set between them. The frame 95 is filled with particle electrodes 96. The particle electrodes 96 are composite particle electrodes composed of particles embedded in an insulating material. The insulating material is a three-dimensional porous plastic ring, and the embedded particles are activated carbon-based particles. The anode plate and cathode plate are connected to the positive and negative terminals of an external power supply, respectively, via metal wires. The electrocatalytic device 9 further removes COD, BOD, ammonia nitrogen, and total nitrogen from the wastewater, and the effluent meets discharge standards.

[0068] The working process of this invention is as follows: High-ammonia nitrogen organic wastewater (such as anaerobic digestate from kitchen waste and leachate) first enters the coagulation and flotation device 1. Coagulants are added by an external coagulant addition component, coagulating with the wastewater. Then, solid-liquid separation is achieved through flotation, removing pollutants such as COD, TP, and suspended solids from the wastewater. The scum generated by flotation is discharged into a separate sludge storage tank. The effluent after flotation enters the aerobic pretreatment device 2 for further treatment. The aerobic pretreatment device adopts the high-load activated sludge process, with no sludge recirculation. The hydraulic retention time (HRT) and sludge retention time (SRT) are equal, ranging from 1 to 3 days. This process can remove COD and BOD5 from the wastewater, reducing the COD and BOD in the wastewater entering the subsequent anaerobic ammonia oxidation device 6. The effluent then enters the sedimentation device 3 for solid-liquid separation. The sedimentation device 3 uses a gravity sedimentation tank with existing technology. The supernatant obtained from sedimentation is transported to the denitrification device 4. The sludge produced by the sedimentation device 3 is not returned and is discharged into a separate sludge tank.

[0069] The inlet of denitrification unit 4 is connected to the outlet of the supernatant from the sedimentation tank and the outlet of the circulating pump from the anaerobic ammonia oxidation unit 6. This denitrification process removes nitrates and nitrites from the effluent from sedimentation unit 3 and the return flow from anaerobic ammonia oxidation unit 6. This reduces the total nitrogen in the effluent and consumes the BOD in the influent to the anaerobic ammonia oxidation unit, lowering the carbon-to-nitrogen ratio and promoting stable operation. The mixed liquor from the denitrification unit is pumped by the ultrafiltration inlet pump to the first ultrafiltration membrane unit 5 for solid-liquid separation. The first ultrafiltration membrane unit 5 is an external ultrafiltration membrane unit that performs solid-liquid separation on the effluent from denitrification unit 4, intercepting sludge, suspended solids, and some large organic molecules in the wastewater. The permeate from ultrafiltration enters the anaerobic ammonia oxidation unit 6 for further treatment, while the remaining sludge is discharged into a separate sludge storage tank.

[0070] The anaerobic ammonia oxidation device 6 is a vertical flow reactor. Its main function is to form and maintain a high concentration of anaerobic ammonia oxidation granular sludge. Under low oxygen conditions, it partially nitrifies ammonia nitrogen in wastewater, converting it into nitrite. Then, through the anaerobic ammonia oxidation reaction, it converts nitrite and ammonia nitrogen into nitrogen gas, which is then removed from the wastewater. The anaerobic ammonia oxidation device includes an outer cylinder, an inner cylinder, a flow guiding device, a flow propulsion device, an aeration device, and a crushing device. The inner cylinder and the flow guiding device form a continuous cylinder. The flow guiding device, the flow propulsion device, the aeration device, and the crushing device divide the inner cavity of the outer cylinder into multiple interconnected zones with different functions: the area above the impeller of the flow propulsion device in the inner cylinder is the inner reaction zone (aerobic reaction zone) 6B, and the area below the impeller and above the crushing device is the mixing reaction zone 6F; the annular columnar channel formed by the outer side of the inner cylinder and the inner side of the first columnar cylinder 611 is the outer downward flow channel 6C; the annular channel formed by the outer side of the flow guiding device and the inner side of the first columnar cylinder 611 is the outer reaction zone 6D; and the area between the lower end of the crushing device and the first conical cylinder 612 is the sludge particle conditioning zone 6E. The aeration device aerates upwards, and combined with the propulsion device, it pushes the air upwards, causing the inner reaction zone, the mixing reaction zone, and the particle conditioning zone to form an upward flow, while the outer downward flow channel and the outer reaction zone form a downward flow. This creates a circulating flow pattern inside the anaerobic ammonia oxidation device, with the inner cylinder cavity rising upwards and the outer cylinder cavity falling downwards.

[0071] The wastewater to be treated enters the mixing reaction zone inside the guide device 63 of the anaerobic ammonia oxidation unit from below the aeration device through the inlet pipe, and mixes with the sewage and granular sludge in the unit. Under the action of the upward flow, it flows upward, passes above the aeration device and enters the inner reaction zone (aerobic reaction zone). Under the action of oxygen provided by aeration and ammonia-oxidizing bacteria in the mixed liquid, the ammonia nitrogen in the wastewater is oxidized to nitrite nitrogen. This area mainly completes the nitrification of ammonia nitrogen. Under the upward push of the wastewater and granular sludge mixed liquid, it continues to flow from the upper edge of the inner cylinder 62 into the outer downward flow channel and the outer reaction zone. There is no aeration device in the outer downward flow channel and the outer reaction zone. The anaerobic ammonia-oxidizing bacteria in the anaerobic ammonia-oxidizing granular sludge in the mixed liquid absorb the ammonia nitrogen and nitrite nitrogen in the wastewater in a low-oxygen or anaerobic environment, convert them into nitrogen gas and remove them from the wastewater.

[0072] The first inner inclined guide shell 6311a of the flow guiding device 63 has a first screen hole 632a on its inclined surface; the second inner inclined guide shell 6311b has a second screen hole 632b on its inclined surface; the size of the first screen hole 632a is smaller than the size of the second screen hole 632b; when the wastewater and granular sludge mixture flows through the outer reaction zone, some wastewater and small granular sludge particles with particle sizes smaller than the first and second screen holes pass through the first and second screen holes under the negative pressure generated by the flow pushing device 64 and flow back into the mixing reaction zone and the inner reaction zone. Granular sludge particles with particle sizes larger than the screen hole sizes continue to flow downward along the outer reaction zone. Some large-sized granular sludge particles are intercepted by the granular sludge retention regulator 634 set on the second outer inclined guide surface of the flow guiding device, so that the sludge residence time (SRT) of large granular sludge particles is separated from the hydraulic residence time (HRT), prolonging the residence time of granular sludge particles in the outer reaction zone, and using the low-oxygen and anaerobic environment of the outer reaction zone to remove more nitrite nitrogen and ammonia nitrogen.

[0073] The mixture of some large-diameter granular sludge and wastewater bypasses the granular sludge retention regulator and the bottom edge of the flow guiding device and enters the granular conditioning zone 6E. The large-diameter granular sludge is crushed by the crushing device 66, which separates the inorganic components from the biological active components in the large-diameter granular sludge (usually aged granular sludge). The inorganic components sink to the bottom of the outer cylinder and are discharged through the sludge discharge port 614. The biological active components (new granular sludge) pass through the screen 665 of the crushing device and enter the mixing reaction zone, where they continue to rise and flow, continue to undergo internal circulation, and continuously grow to form larger-diameter granular sludge. Thanks to the differences in the size and position of the screen holes on the flow guiding device 63, the through holes in the inner cavity of the flow guiding device 63, and the screens on the crushing device 66, the separation of clear liquid, flocculent sludge, and fine, medium-to-large, and large-diameter particles is achieved. Taking the sludge-water mixture of the sewage biological treatment system as an example, clear liquid, flocculent sludge, and small-diameter sludge particles can enter the inner reaction zone through the small-sized screen holes (first screen holes) to carry out internal circulation. Medium-to-large-diameter sludge particles (slightly denser than water) are intercepted and can only fall down along the flow guiding device under inertia, passing through the large-sized screen holes (second screen holes) to enter the mixing reaction zone to carry out internal circulation. Large-diameter sludge particles (even denser) cannot pass through any of the screen holes and can only bypass the bottom edge of the flow guiding device to enter the particle conditioning zone 66, pass through the screen of the sludge crushing device, and then rise and flow through the mixing reaction zone before entering the inner reaction zone.

[0074] This invention features a propulsion device 64 located at the upper part of the inner cavity of the flow guiding device 63, which pushes the mixed liquid upward. An aeration device is positioned in the middle of the inner cavity of the flow guiding device 63, below the propulsion device. This allows the gas introduced by the aeration device to move upward and combine with flocs or granular sludge, increasing the upward flow velocity. Combined with the propulsion device positioned at the sieve openings, this further amplifies the upward flow velocity of the mixed liquid. The upper inclined guide member of the flow guiding device 63 expands the upward flow in the lower part of the inner cavity, driving the fluid below to rise, thus creating a strong negative pressure near the sieve openings. This continuously draws fluid from outside the flow guiding device into the inner cavity through the sieve openings, accelerating the internal circulation process in the upper part of the reactor and promoting the granulation of the anaerobic ammonia oxidation sludge. Particulate matter and bubbles carried in the mixed liquid rise in their direction of motion, exhibiting turbulent flow. Large bubbles can be broken down into smaller bubbles by the propulsion device. Tiny bubbles that may be carried in the particulate matter are further dispersed by the turbulent flow and the propulsion device. Separation occurs through mutual collisions and other effects; after degassing, the particulate matter can better contact or adsorb and bind with dissolved substances in a turbulent mixing state; the crushing device set at the bottom of the inner cavity of the anaerobic ammonia oxidation device (near the granular conditioning zone) can crush the large-diameter granular sludge that bypasses the lowest edge of the guide device 63, so that the inorganic components and biological active components in the large-diameter granular sludge (usually aged granular sludge) are separated. The inorganic components sink to the bottom of the outer cylinder and are discharged through the sludge discharge port 614, while the biological active components (new granular sludge) continue to rise and flow after entering the mixing reaction zone, continue to carry out internal circulation and grow to form larger-diameter granular sludge; the aerobic reaction zone (i.e., the inner reaction zone 6B) and the anaerobic reaction zone (i.e., the outer reaction zone 6D) of the anaerobic ammonia oxidation device of the present invention are completely separated, and the aerobic and anaerobic functional microorganisms cooperate efficiently, the sludge granulation speed is accelerated, the granular sludge is constantly renewed, and the physical mass transfer and biochemical reaction are highly efficient and coordinated, which improves the overall efficiency of pollution degradation reaction.

[0075] The effluent pipe of the anaerobic ammonia oxidation unit is equipped with a branch pipe. Part of the effluent from the anaerobic ammonia oxidation unit is returned to the denitrification unit 4 through the pipe, while the other part of the effluent is transported to the A / O biological treatment unit 7 through the pipe for further removal of pollutants from the effluent.

[0076] The A / O biological treatment device is a conventional anoxic / aerobic activated sludge treatment device. It removes pollutants such as COD, ammonia nitrogen, and total nitrogen from wastewater through the metabolism of activated sludge. The sludge-water mixture of the A / O biological treatment device undergoes solid-liquid separation through the ultrafiltration membrane device 8, which intercepts sludge, suspended solids, and some large molecular organic matter in the wastewater. The permeate separated by ultrafiltration enters the electrocatalytic device 9 through a pipeline. The electrocatalytic device 9 further removes COD, BOD, ammonia nitrogen, and total nitrogen from the wastewater, and the effluent meets the discharge standards.

[0077] Compared with the prior art, the present invention has the following features and technical effects:

[0078] The main denitrification unit of this invention adopts anaerobic ammonia oxidation denitrification, which can save a lot of external carbon source costs and aeration power consumption, and reduce carbon emissions compared with the traditional nitrification-denitrification denitrification process.

[0079] This invention incorporates a denitrification unit at the front end of the anammox unit, recirculating a portion of the effluent from the anammox unit back to the front-end denitrification unit. This allows the nitrates generated in the anammox effluent to undergo denitrification in the front-end denitrification unit using the organic matter (COD, BOD) in the wastewater itself. This process removes total nitrogen from the wastewater and further reduces the concentration of organic matter (COD, BOD) in the denitrification unit effluent, thereby lowering the carbon-to-nitrogen ratio (COD:TN) of the wastewater entering the anammox unit. This is more conducive to the long-term stable operation of the anammox unit.

[0080] The anaerobic ammonia oxidation device of the present invention includes at least three improvements: 1. A flow-pushing device is installed at the sieve hole position to push the flow upward; 2. The aeration device is moved into the through hole and is located below the flow-pushing device, not below the entire flow-guiding device; 3. A crushing and screening device is installed below the entire flow-guiding device. These three core inventive points form a structured flow-guiding module, and its key advantage over the prior art mentioned in the background section is:

[0081] A: A flow-pushing device is installed at the sieve opening position; its main function is to reduce the internal circulation time of particles at this position: because the particle size that can pass through the sieve opening is very small, it does not require much reaction time. The flow-pushing device pushes the flow upward, which can drive the fluid below and to the side to rise, thereby forming a negative pressure below and to the side of the sieve opening. The fluid is continuously drawn into the side through the sieve opening of the guide component, selectively causing small particles such as clear water and flocs to rise rapidly, reducing the internal circulation residence time, thereby accelerating the internal circulation of the upper layer, accelerating the clear liquid output efficiency of the purified water outlet, improving the overall circulation efficiency and purification effect of the vertical flow reactor, and reducing the purification time.

[0082] B: The aeration component is moved into the flow guiding device and located below the flow propulsion device, but not below the entire flow guiding device. This has two main functions: 1. Moving it into the flow guiding device, close to the flow propulsion device, creates a synergistic structure, increasing the upward flow velocity and solving the bubble problem: After the gas introduced by the aeration device moves upward, it can quickly combine with the clear water, flocs, and other small-diameter granular sludge particles above, increasing the upward flow velocity. This, combined with the flow propulsion device located at the screen opening, further increases the upward flow velocity of the mixed liquor. More importantly, particles carried in the fluid will rise along the direction of fluid movement, exhibiting turbulent flow. Tiny bubbles that may be carried in the particles will be amplified by the turbulent flow and aeration. Separation occurs through the mutual collision of the device and the flow-driving device; after degassing, the particulate matter can better contact or adsorb with dissolved substances in a turbulent mixing state; 2. The aeration device is set inside the flow-driving device, not below it, which can completely isolate the upper internal circulation (small particles passing through the sieve holes) from the lower internal circulation (large particles blocked by the sieve holes but entering through the through holes), preventing the lower internal circulation particles from contacting the aeration device too early, providing more space and more reaction time for the lower non-clean water, such as large sludge particles blocked by the sieve holes but entering through the through holes, promoting the circulation effect of the lower non-clean water, and comprehensively improving the overall reaction effect;

[0083] C: A crushing and screening device is installed below the flow guiding device; this can accelerate the crushing of large-diameter sludge particles falling from above during the continuous growth of large-diameter sludge particles, increase the exposed area of ​​inorganic matter, promote the anaerobic reaction at this stage, further improve the reaction efficiency, and accelerate the process of participating in the internal circulation.

[0084] The design of the combination and specific positions of the four structures—the flow guiding device, the flow pushing device, the aeration device, and the crushing device—is the result of the inventor's creative labor based on the different requirements of particles of different sizes in the vertical flow reactor for reaction time, reaction position, and circulation trajectory. It is not a simple selection of conventional technology. The flow guiding module of this invention ingeniously conceives the flow guiding device, the flow pushing device, the aeration device, and the crushing and screening device into an integrated system. They work together to exert their effects, and none of them can be missing. It is perfectly applicable to granular sludge systems that have both aerobic and anaerobic conditions. It fundamentally overcomes the inherent defects of activated sludge and packing biofilm systems, such as the lack of selectivity of functional microorganisms and the blockage caused by excessive accumulation of biofilm. The propulsion device at the top of the inner cavity of the flow guiding device and the aeration device below it can create negative pressure near the screen holes, accelerate the internal circulation of the upper clear liquid, promote the aerobic (nitrification) reaction, and directly separate it from the internal circulation of the bottom granular sludge, forming completely different movement paths for clear liquid (sewage) and sludge (anaerobic ammonia oxidation granular sludge). This achieves separation of sewage retention time and sludge retention time within the same reactor. Furthermore, it significantly extends the retention (reaction) time of the anaerobic ammonia oxidation granular sludge under anaerobic conditions, accumulating more anaerobic ammonia oxidation functional microorganisms with slow self-proliferation rates, which is beneficial for improving the efficiency of anaerobic ammonia oxidation reaction and provides favorable conditions for efficient synergy among different functional microorganisms, thereby enhancing the overall autotrophic denitrification effect. In addition, the crushing and screening device below further crushes the aged, large-diameter granular sludge, separates inorganic components, promotes the renewal of granular sludge, and further improves reaction efficiency. Its beneficial effects are self-evident.

[0085] The device of this invention can achieve low-carbon and low-cost treatment of high ammonia nitrogen organic wastewater, especially for the treatment of kitchen waste wastewater and landfill leachate with high emission standards. This invention can replace the traditional membrane separation process and does not produce nanofiltration membrane or reverse osmosis membrane concentrate that requires secondary treatment, providing a new equipment for the treatment of high ammonia nitrogen organic wastewater.

[0086] The influent water quality of the anaerobic digester wastewater from kitchen waste in this embodiment is as follows: COD: 8000-15000 mg / L, BOD5: 4500-5000 mg / L, TN: 2100-2800 mg / L, NH3-N: 1800-2000 mg / L, TP: 110-130 mg / L, SS: 5000-7000 mg / L, animal and vegetable oils: 50-120 mg / L, pH: 7.5-8, and color: 800-1000 times. The pollutant concentrations and removal rates of the effluent after treatment by the device of this invention are shown in Table 1.

[0087] Table 1: Effluent pollutant concentrations and removal rates

[0088]

[0089] All pollutant indicators in the effluent were better than the limits of the "Class I Standard" in the "Integrated Wastewater Discharge Standard (GB8978-1996)".

[0090] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A device for treating high-ammonia-nitrogen organic wastewater, characterized in that, include: The wastewater treatment process consists of a coagulation and flotation unit, an aerobic pretreatment unit, a sedimentation unit, a denitrification unit, a first ultrafiltration membrane unit, an anaerobic ammonia oxidation unit, an A / O biochemical unit, a second ultrafiltration membrane unit, and an electrocatalytic unit, connected in series along the wastewater treatment flow direction. The coagulation and flotation unit is used to remove suspended particulate matter, grease, and some colloidal impurities from wastewater; its effluent end is connected to the influent end of the aerobic pretreatment unit. The aerobic pretreatment unit is used to degrade some easily degradable organic pollutants in the wastewater and achieve preliminary nitrification of ammonia nitrogen; its effluent end is connected to the influent end of the sedimentation unit. The sedimentation unit is used to separate the activated sludge produced after aerobic pretreatment; its effluent end is connected to the influent end of the denitrification unit. The denitrification unit is used to reduce nitrate nitrogen in the wastewater to nitrogen gas; its effluent end is connected to the influent end of the ultrafiltration membrane unit. The first ultrafiltration membrane unit is used to retain microorganisms generated during the denitrification process. The first anaerobic ammonium oxidizer (A / O) device removes unsettled impurities and its effluent is connected to the influent of the anaerobic ammonium oxidation unit (AAM). The AAM converts ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas, and its effluent is connected to the influent of the A / O biological treatment unit (A / O). The A / O biological treatment unit further removes residual nitrogen and organic pollutants from the wastewater, and its effluent is connected to the influent of the ultrafiltration membrane unit (UFMU). The second UFMU retains activated sludge and impurities generated during the A / O biological treatment process, and its effluent is connected to the influent of the electrocatalytic device (ECD). The ECD is used to deeply degrade residual recalcitrant organic pollutants in the wastewater, ensuring that the effluent meets discharge standards. The anaerobic ammonia oxidation device includes: an outer cylinder, an inner cylinder, a flow guiding device, a flow propulsion device, an aeration device, and a crushing and screening device; the outer cylinder and the inner cylinder form a reaction chamber; the outer cylinder includes a first cylindrical body containing an inner cavity and a first conical cylinder that is wider at the top and narrower at the bottom and closed at the bottom; the flow guiding device is a two-stage shell with an internally connected cavity, including: a first inverted frustum-shaped inner flow guiding shell with an inner cavity that is wider at the top and narrower at the bottom and open at both the top and bottom surfaces, and a first conical shell with an inner cavity that is narrower at the top and wider at the bottom and open at both the top and bottom surfaces. The system comprises an open first external inclined guide shell, a second internal inclined guide shell with an inner cavity that is wider at the top and narrower at the bottom, and both the upper and lower bottom surfaces are open, and a second external inclined guide shell with an inner cavity that is narrower at the top and wider at the bottom, and both the upper and lower bottom surfaces are open; the upper end of the shell is provided with a sieve hole; a flow propulsion device is located below the inner cylinder and above the inner cavity of the guide shell, including: a flow propulsion frame, a flow propulsion drive component, a flow propulsion main shaft, and a flow propulsion impeller; the flow propulsion frame is an inverted frustum-shaped cage-like shell that is open at the top and closed at the bottom with hollowed-out sides, and the flow propulsion drive... The components are installed on the lower bottom surface of the propulsion shell. The propulsion main shaft is connected to the propulsion drive component, which passes through the center of the lower bottom surface of the propulsion shell and extends along the centerline of the propulsion shell into the interior of the propulsion shell. The propulsion impeller is installed on the propulsion main shaft. The aeration device is located in the middle of the inner cavity of the second outer inclined guide shell of the guide device, and is located below the propulsion device and above the crushing and screening device. The crushing and screening device is located in the inner cavity of the first conical cylinder of the outer cylinder, and is located below the guide device. It includes: a shell, a crushing drive component, and a crushing drive component. The components include a moving part, a drive shaft, a paddle cutter, and a screen. The frame is an inverted frustum-shaped shell that is open at both the top and bottom, wider at the top and narrower at the bottom. A screen with uniform mesh openings is installed on the bottom surface of the frame. The upper part of the frame is connected to the lower part of the second outer inclined guide shell of the flow guiding device. The crushing drive is installed on the bottom surface of the frame. The drive shaft, which connects to the crushing drive, passes through the center of the bottom surface of the frame and extends along the center line of the frame to the outside of the frame. The paddle cutter is installed on the drive shaft on the outer side of the bottom of the frame and is located below the screen.

2. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The internal cavity of the coagulation-flotation device is equipped with a skimming mechanism, a scum tank, and a dissolved air release mechanism. The air flotation inlet pipe and air flotation outlet pipe are connected to the internal cavity of the air flotation device, and the air flotation outlet pipe is connected to the outlet of the air flotation device and the inlet of the aerobic pretreatment device. The scum discharge pipe is connected to the scum tank and a separate sludge storage tank to discharge the sludge generated by the coagulation-flotation device into the separate sludge storage tank. Coagulant is added to the coagulation-flotation device by an external coagulant addition component, coagulates with the wastewater, and then achieves solid-liquid separation through air flotation to remove pollutants from the wastewater.

3. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The aerobic pretreatment device contains activated sludge mixture and is equipped with an aerobic aeration unit connected to an external blower. The first connecting pipe connects the outlet at the top of the aerobic pretreatment device and the inlet at the top of the sedimentation device.

4. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The sedimentation device uses a gravity sedimentation tank to separate solids and liquids in the effluent from the aerobic pretreatment device. The second connecting pipe connects the supernatant outlet of the sedimentation device to the inlet of the denitrification device, transporting the supernatant from the sedimentation device to the denitrification device. The third connecting pipe connects the sludge discharge outlet to a separate sludge storage tank. The sludge produced by the sedimentation device does not flow back and is all discharged into the separate sludge tank.

5. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The denitrification unit is equipped with a stirring mechanism inside its cavity; the inlet of the denitrification unit is connected to the outlet of the supernatant of the sedimentation tank and the outlet of the effluent circulation pump of the anaerobic ammonia oxidation unit, so that the nitrates and nitrites contained in the effluent of the sedimentation unit and the return liquid of the anaerobic ammonia oxidation unit are removed through denitrification. The effluent from the denitrification unit enters the first ultrafiltration membrane unit via the first ultrafiltration feed pump.

6. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The first ultrafiltration membrane device includes a first ultrafiltration feed pump and a first ultrafiltration membrane module. A fourth connecting pipe connects the inner cavity of the denitrification unit and the inlet of the first ultrafiltration feed pump. A fifth connecting pipe connects the outlet of the ultrafiltration feed pump and the first inlet of the first ultrafiltration membrane module. A sixth connecting pipe connects the sludge return interface of the first ultrafiltration membrane module to the inner cavity of the denitrification unit. A seventh connecting pipe connects the product water interface of the ultrafiltration membrane module to the inlet of the anaerobic ammonia oxidation unit, and the water enters the anaerobic ammonia oxidation unit.

7. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The effluent pipe of the anaerobic ammonia oxidation unit is equipped with a branch pipe, which is connected to the inlet of the return pump. A portion of the effluent from the anaerobic ammonia oxidation unit is returned to the inlet pipe of the denitrification unit through the pipe. The ratio of the return flow rate to the effluent flow rate of the sedimentation unit is 50% to 200%. The other portion of the effluent from the anaerobic ammonia oxidation unit is transported to the anoxic zone of the A / O biological treatment unit through the pipe.

8. The high ammonia nitrogen organic wastewater treatment device according to claim 1, characterized in that, The A / O biological treatment device includes an anoxic zone, an aerobic zone, and an internal reflux pump. The anoxic zone is equipped with a stirring mechanism, the top of which is connected to the aerobic zone. The aerobic zone is equipped with an aeration mechanism connected to an external blower. The outlet pipe of the internal reflux pump is connected to the anoxic zone, and the A / O inlet pipe is connected to the aerobic zone, transporting the activated sludge mixture in the aerobic zone to the anoxic zone.

9. The high-ammonia-nitrogen organic wastewater treatment device according to any one of claims 1 to 8, characterized in that, The second ultrafiltration membrane device includes a second ultrafiltration feed pump and a second ultrafiltration membrane module. A ninth connecting pipe connects the inner cavity of the aerobic zone to the inlet of the second ultrafiltration feed pump. A tenth connecting pipe connects the outlet of the ultrafiltration feed pump to the second inlet of the second ultrafiltration membrane module. An eleventh connecting pipe connects the sludge return interface of the second ultrafiltration membrane module to the inner cavity of the aerobic zone. A twelfth connecting pipe connects the product water interface of the ultrafiltration membrane module to the inlet of the electrocatalytic device. The excess sludge is discharged through the excess sludge discharge port of the ultrafiltration membrane device to a separately provided sludge storage tank via a pipeline.

10. The high ammonia nitrogen organic wastewater treatment device according to claim 9, characterized in that, The electrocatalytic device includes a rectangular shell with an inner cavity, a top cover connected to the upper part of the shell, an anode plate and a cathode plate arranged alternately at a certain interval inside the shell, an insulating frame that does not contact the anode and cathode plates is provided between the anode and cathode plates, and the interior is filled with particle electrodes.

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