Low-carbon treatment device for high-ammonia-nitrogen wastewater

Abstract

The utility model provides a kind of high ammonia nitrogen wastewater low carbon processing device, including the filter mechanism, pretreatment mechanism, denitrification mechanism, aeration reaction mechanism and effluent mechanism connected in turn, and pretreatment mechanism is provided with dosing area and aeration assembly;Denitrification mechanism is internally provided with several upper and lower parallel distribution's filler layer, and filler layer is provided with filler ball for nitrification reaction / denitrification, and the bottom of denitrification mechanism is provided with jet aerator;Aeration reaction mechanism is internally provided with the lifting aeration assembly that can move up and down;Effluent mechanism is internally provided with the MBR membrane for solid-liquid separation.The utility model uses multi-section process mechanism combination, compared with prior art, with small floor area, low capital cost, substantially reduce reagent and energy consumption and the advantages such as low sludge production, energy saving and environmental protection, reduce wastewater treatment cost, and practicality is strong.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a low-carbon treatment device for high ammonia nitrogen wastewater. Background Technology

[0002] With rapid economic development, various industries have generated large amounts of wastewater with high concentrations of ammonia nitrogen. The massive discharge of this wastewater leads to the accumulation of ammonia nitrogen in water bodies, causing eutrophication and deterioration, and posing a significant threat to the aquatic environment. To remove ammonia nitrogen from wastewater, alternating anaerobic and aerobic treatment processes are commonly used, such as the AO process, AOAO process, A2O process, and SBR process. The core technology is nitrification-denitrification (NDR), also known as traditional NDR, where organic nitrogen in the wastewater is converted into NH4+ by heterotrophic microorganisms. + -N, and then autotrophic microorganisms will convert NH4+. + -N is converted to NO2 − -N and NO3 - -N, NO2 - -N and NO3 - Nitrogen (N-N) is converted to nitrogen (N2) by heterotrophic microorganisms under anaerobic conditions, achieving denitrification. This process requires a high carbon-to-nitrogen (C / N) ratio. Without a high C / N ratio, denitrification cannot proceed effectively and cannot achieve stable nitrogen removal. A high C / N ratio is crucial for the smooth progress of denitrification and efficient nitrogen removal. However, in reality, wastewater from various industries often has a low C / N ratio, characterized by high ammonia nitrogen and low COD. Traditional nitrification-denitrification processes require the addition of large amounts of external nutrient solutions to increase the C / N ratio in wastewater. This increases operating costs and carbon emissions, which does not meet environmental protection requirements.

[0003] The existing low-carbon treatment technology for high ammonia nitrogen wastewater mainly uses the traditional nitrification-denitrification denitrification process. This process has the following disadvantages: (1) it requires a large area and has high investment costs; (2) it requires a very high sludge concentration, which increases the consumption of a large amount of equipment and power, and generates a large amount of sludge and disposal costs; (3) it requires the addition of nutrient solution to increase the C / N ratio, which results in high operating costs and increased carbon emissions; it also has a large oxygen consumption, which increases energy consumption. Based on this, this utility model proposes a low-carbon treatment device for high ammonia nitrogen wastewater to solve the above problems. Summary of the Invention

[0004] In order to overcome the problems of existing technologies, this utility model provides a low-carbon treatment device for high ammonia nitrogen wastewater, which can significantly reduce the footprint, reduce sludge concentration, reduce sludge disposal costs, reduce investment in power equipment, and eliminate the need for external nutrient solution, thereby reducing carbon emissions, significantly reducing oxygen consumption and energy consumption.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a low-carbon treatment device for high ammonia nitrogen wastewater, comprising a filtration mechanism, a pretreatment mechanism, a denitrification mechanism, an aeration reaction mechanism, and an effluent mechanism connected in sequence; the pretreatment mechanism is provided with a dosing port, and the pretreatment mechanism is provided with an aeration zone and a dosing zone, and the aeration zone is provided with an aeration component; the denitrification mechanism is provided with several packing layers, and the packing layers are provided with packing balls for nitrification / denitrification reactions, and the several packing layers are distributed vertically in parallel, and a jet aerator is provided at the bottom of the denitrification mechanism; the aeration reaction mechanism is provided with a liftable aeration component that can move vertically; the effluent mechanism is provided with an MBR membrane for solid-liquid separation.

[0006] Furthermore, the filtration mechanism includes a filter body, inside which a filter plate and a high-pressure nozzle are disposed; the filter plate is inclinedly disposed inside the filter body, dividing the filter body into upper and lower spaces, the high-pressure nozzle is disposed in the lower space, the liquid inlet of the filter body is connected to the upper space, and the liquid outlet of the filter body is connected to the lower space.

[0007] Furthermore, the filter body is equipped with a sludge removal mechanism located at the lowest point of the upper space of the filter body; a pressurization mechanism is provided on the outside of the filter body, which is connected to a high-pressure nozzle to provide high-pressure power.

[0008] Furthermore, the aeration components inside the pretreatment unit include an air-water mixer, an aeration pipe, and an aeration head; the outlet of the air-water mixer is connected to the aeration pipe, and the end of the aeration pipe is connected to the aeration head; a flow valve is installed on the aeration pipe.

[0009] Furthermore, the pretreatment mechanism is equipped with a sludge discharge assembly and a chemical dosing mixer; the sludge discharge assembly includes a sludge discharge pump and a sludge discharge pipe, the sludge discharge pipe is horizontally distributed at the bottom of the pretreatment mechanism, the sludge discharge pipe is provided with a sludge inlet, and the sludge discharge pump is connected to the sludge discharge pipe.

[0010] Furthermore, the packing layer inside the denitrification mechanism includes multiple stainless steel tennis balls, and a flexible body is disposed inside the stainless steel tennis balls. The packing balls are wrapped and filled inside the stainless steel tennis balls by the flexible body.

[0011] Furthermore, the denitrification mechanism is also equipped with a denitrification circulation pump. The bottom of the denitrification mechanism is provided with an inlet and an outlet. The denitrification circulation pump is connected to the outlet through a circulation outlet pipe and to the inlet through a circulation inlet pipe. The liquid outlet pipe of the filtration mechanism is connected to the circulation inlet pipe.

[0012] Furthermore, the denitrification mechanism is also equipped with an online dissolved oxygen meter, an online OPR meter, a mixer, and a water distributor; the online dissolved oxygen meter is located at the bottom of the denitrification mechanism, and the online OPR meter is located at the top of the denitrification mechanism; the mixer is located near the packing layer; and the water distributor is located at the bottom of the denitrification mechanism.

[0013] Furthermore, the liftable aeration component includes several jet aerators arranged in parallel, which can rise or fall synchronously inside the aeration reaction mechanism; the aeration reaction mechanism is also equipped with an online dissolved oxygen meter and a water distribution circulation pump, the online dissolved oxygen meter being located inside the aeration reaction mechanism; the bottom of the aeration reaction mechanism is provided with an inlet and an outlet, and the water distribution circulation pump is connected to the outlet through a circulating water outlet pipe on one hand, and to the inlet through a circulating water inlet pipe on the other hand.

[0014] Furthermore, this device is also equipped with an aerator; the aerator is connected to the oxygen-requiring structures in the pretreatment unit, denitrification unit, aeration reaction unit and effluent unit through conveying pipes, and valves and flow meters are installed on the conveying pipes.

[0015] The beneficial effects of this utility model are: Compared with the prior art, this utility model has the following advantages: (1) This device occupies a small area and has low infrastructure costs. It can significantly reduce the addition of reagents, reduce power consumption and electricity consumption, and produce low sludge, which greatly reduces operating costs. (2) The filler layer of this utility model uses stainless steel spheres as the skeleton. Compared with the prior art, it has a longer service life, better stability, is easy to replace, and is safe, convenient and quick. (3) The aeration reaction zone of the present invention is equipped with a jet aerator that can move up and down at a uniform speed. Compared with the prior art, the aeration reaction zone is more uniformly mixed, avoiding the formation of sediment dead zones, while improving the dissolved oxygen rate and saving energy. Attached Figure Description Figure 1 This is a schematic diagram of the overall structure of the low-carbon treatment device for high ammonia nitrogen wastewater of this utility model; Figure 2 This is a schematic diagram of the filter mechanism of this utility model; Figure 3 This is a plan view of the packing layer arrangement of this utility model; Figure 4 This is a layout diagram of the stainless steel tennis ball body of this utility model; The labels in the attached diagram are: 1. Filtration mechanism; 11. Pressurization mechanism; 12. Filter plate; 13. High-pressure nozzle; 2. Pretreatment mechanism; 21. Dosing mixer; 22. Flow valve; 23. Aeration head; 24. Air-water mixer; 25. Sludge pump; 26. Sludge discharge pipe; 3. Denitrification mechanism; 31. Denitrification circulation pump; 32. Jet aerator; 33. Packing layer; 331. Stainless steel tennis ball; 332. Flexible body; 333. Packing ball; 34. Mixer; 35. Valve; 36. Flow meter; 37. Online dissolved oxygen meter; 38. Online ORP meter; 39. Water distributor; 4. Aeration reaction mechanism; 41. Liftable aeration component; 42. Aeration and oxygenation machine; 43. Water distribution circulation pump; 5. Water discharge mechanism; 51. MBR membrane; 52. Self-priming drainage pump. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] like Figure 1 As shown in the figure, this utility model embodiment provides a low-carbon treatment device for high ammonia nitrogen wastewater, including a filtration mechanism 1, a pretreatment mechanism 2, a denitrification mechanism 3, an aeration reaction mechanism 4, and an effluent mechanism 5. The liquid outlet of the filtration mechanism 1 is connected to the inlet of the pretreatment mechanism 2, the outlet of the pretreatment mechanism 2 is connected to the bottom inlet of the denitrification mechanism 3, the top outlet of the denitrification mechanism 3 is connected to the inlet of the aeration reaction mechanism 4, the outlet of the aeration reaction mechanism 4 is connected to the inlet of the effluent mechanism 5, and the treated liquid of the effluent mechanism 5 is discharged through a self-priming drainage pump 52.

[0018] like Figures 1-2As shown, the filtration mechanism 1 includes a filter body, inside which a filter plate 12 and a high-pressure nozzle 13 are disposed. A pressurizing mechanism 11 is disposed outside the filter body, connected to the high-pressure nozzle 13 to provide high-pressure power. The filter plate 12 is inclined inside the filter body, dividing it into upper and lower spaces. The high-pressure nozzle 13 is disposed in the lower space, with its spray direction facing the filter plate 12 and its spray range covering the filter plate 12. The inlet of the filter body communicates with the upper space, and the outlet of the filter body communicates with the lower space. Wastewater to be treated enters the upper space of the filter body through the inlet, is filtered by the filter plate 12, and the filtered liquid falls into the lower space of the filter body under gravity, finally flowing into the pretreatment mechanism 2 through the outlet of the filter body. The filtered solids remain on the surface of the inclined filter plate 12 and can be jetted through the high-pressure nozzle 13 to the lowest point of the upper space of the filter body. A sludge discharge mechanism is provided at the lowest point of the upper space of the filter body to discharge the sludge. The structure of the sludge discharge mechanism can be a sludge auger screw conveyor or other types of sludge discharge mechanisms.

[0019] like Figure 1 As shown, the pretreatment unit 2 is equipped with a dosing port, allowing for two independent dosing reaction zones and one aeration reaction zone. It is also equipped with a dosing mixer 21, through which the applied chemicals (selected according to the wastewater composition) can be added. The mixer 21 then uniformly mixes the wastewater to remove heavy metals, phosphorus, suspended solids (SS), etc. The pretreatment unit 2 internally includes an aeration assembly and a sludge removal assembly. The aeration assembly, located in the aeration reaction zone, includes an air-water mixer 24, aeration pipes, and aeration heads 23. The outlet of the air-water mixer 24 connects to the aeration pipes, the end of which connects to the aeration heads 23. A flow valve 22 is installed on the aeration pipes. Oxygen and liquid are mixed in the air-water mixer 24 and then discharged through the aeration heads 23, serving both a mixing function and providing initial oxidation of the wastewater. The sludge discharge assembly includes a sludge discharge pump 25 and a sludge discharge pipe 26. The sludge discharge pipe 26 is horizontally distributed at the bottom of the pretreatment unit 2. The sludge discharge pipe 26 is provided with a sludge inlet. The sludge in the pretreatment unit 2 can fall into the sludge discharge pipe 26 through the sludge inlet. The sludge discharge pump 25 is connected to the sludge discharge pipe 26 and can periodically extract the sludge in the sludge discharge pipe 26.

[0020] like Figure 1 and Figures 3-4As shown, the denitrification mechanism 3 has three packing layers 33 inside, each containing packing balls 333 for nitrification / denitrification reactions. The three packing layers 33 are arranged vertically in parallel. Each packing layer 33 includes multiple stainless steel tennis balls 331, each containing a flexible body 332. The packing balls 333 are enclosed and filled within the stainless steel tennis balls 331 by the flexible body 332. Nitrifying and denitrifying microorganisms are attached to the inside of the packing balls 333. A jet aerator 32 is installed at the bottom of the denitrification mechanism 3 to aerate the wastewater, allowing nitrification to occur primarily at the bottom of the packing layer 33, producing NO2. − Meanwhile, in the upper packing layer 33, denitrification mainly occurs to generate nitrogen gas.

[0021] The stainless steel tennis ball (331) has a diameter of 100-150mm. The flexible body occupies 1 / 3 to 1 / 2 of the internal space of the stainless steel ball, and the filler ball occupies 1 / 2 to 2 / 3 of the flexible body volume. The filler ball is obtained by mixing, pressing, and sintering graphene powder, activated carbon powder, sulfur powder, and calcium carbonate powder in a specific mass ratio of 0.1:1:(2-4):(3-6). The mixture is thoroughly crushed, stirred evenly, and sintered to form a high-strength, stable filler ball with a diameter of 5-10mm. Graphene has a high adsorption capacity, and activated carbon is porous with a specific surface area of ​​800m². 2 / g-1500m 2 / g, microorganisms easily attach, making it easier to screen for target bacteria. Sulfur provides sulfur for microbial autotrophic denitrification, enhancing the system's nitrogen removal effect. Calcium carbonate provides alkalinity, eliminating the need for additional acid or alkali to adjust the system's pH, preventing wastewater acid-base imbalance that could affect nitrogen removal efficiency. Alternatively, packing balls can be prepared using the packing material disclosed in patent CN 109650560A.

[0022] In this embodiment, the denitrification mechanism 3 is further equipped with a denitrification circulation pump 31. The bottom of the denitrification mechanism 3 is provided with an inlet and an outlet. The denitrification circulation pump 31 is connected to the outlet through a circulation outlet pipe and to the inlet through a circulation inlet pipe. The liquid outlet pipe of the filtration mechanism 1 is connected to the circulation inlet pipe. The liquid filtered by the filtration mechanism 1 and the circulating liquid enter the denitrification mechanism 3 together for denitrification.

[0023] In addition, the denitrification unit 3 is equipped with an online dissolved oxygen meter, an online OPR meter, a mixer 34, and a water distributor 39. The online dissolved oxygen meter is located at the bottom of the denitrification unit 3 to monitor the dissolved oxygen concentration in the water in real time. The online OPR meter is located at the top of the denitrification unit 3 to analyze water quality in real time. Two mixers 34 are installed, one on the surface of the first and one on the surface of the second packing layer 33, to promote uniform reaction. The water distributor 39 is located at the bottom of the denitrification unit 3 to improve uniformity.

[0024] like Figure 1 As shown, the aeration reaction mechanism 4 is equipped with a liftable aeration component 41 that can move up and down to evenly distribute air within the aeration reaction mechanism 4 and promote the oxidation reaction. The liftable aeration component 41 includes three jet aerators or air-water mixers, which are arranged in parallel and connected to an upper lifting frame. The lifting frame rises or falls under the action of a drive mechanism, thereby enabling the three jet aerators / air-water mixers to rise or fall synchronously within the aeration reaction mechanism 4. In addition, the aeration reaction mechanism 4 is also equipped with an online dissolved oxygen meter. The online dissolved oxygen meter is installed inside the aeration reaction mechanism 4 to monitor the dissolved oxygen concentration in the water in real time. The aeration reaction mechanism 4 is also equipped with a water distribution circulation pump 43. The bottom of the aeration reaction mechanism 4 is equipped with an inlet and an outlet. The water distribution circulation pump 43 is connected to the outlet through a circulating water outlet pipe and to the inlet through a circulating water inlet pipe, and is also connected to the inlet of the air-water mixer to mix with oxygen and aerate through the aeration port.

[0025] like Figure 1 As shown, the effluent mechanism 5 is equipped with an MBR membrane 51 for solid-liquid separation. The liquid treated by the aeration reaction mechanism 4 is processed by the MBR membrane 51 and finally discharged by the self-priming drain pump 52.

[0026] This device is also equipped with an aerator 42, which provides oxygen to each part. It is connected to the oxygen-requiring structures in the pretreatment unit 2, denitrification unit 3, aeration reaction unit 4 and effluent unit 5 through conveying pipes. The conveying pipes are equipped with valves 35 and flow meters 36 for adjusting the flow rate and switching on and off.

[0027] The operating principle of this device is as follows: 1. Filtering: Wastewater is connected to the inlet of the filtration mechanism via a pipe. The wastewater flows by gravity through the filter plates on the filtration mechanism to remove suspended solids. The filtered wastewater then flows by gravity through the outlet of the filtration mechanism to the next step. Solids are conveyed into the slag hopper via the filtration mechanism's built-in screw conveyor. The filtration mechanism is also equipped with intermittent, automatic, and high-pressure washing devices to prevent filter plate clogging. If self-washing cannot prevent filter plate clogging due to wastewater quality, the filter plates can be manually removed, soaked in acid or alkali, and then cleaned with a brush. The cleaned filter plates can then be reinstalled for reuse.

[0028] The self-rinsing interval of the filter mechanism can be determined according to the wastewater quality. It is usually set to rinse for 0.5 to 1 minute and stop for 3 to 5 minutes, alternating between the two. The filter plate can be manually removed every 3 to 6 months and cleaned with citric acid or 10% liquid alkali.

[0029] 2. Pretreatment The effluent from the filtration unit is connected to the inlet of the pretreatment unit via a pipeline and flows into the pretreatment unit by gravity. First, it enters the chemical dosing zone of the pretreatment unit, which is equipped with a mixer and a flange dosing interface. Both dosing zones have connecting ports at their bottoms. After passing through these two dosing zones, the effluent enters the aeration reaction zone through the upper connecting port between the dosing zone and the aeration reaction zone. The pretreatment unit's permeate water is completely mixed with the air from the aeration equipment in a high-efficiency air-water mixer, and then connected to the aeration heads of the pretreatment unit via a pipeline. Next, it enters the sedimentation zone, which has a sludge discharge assembly at its bottom. Sludge discharge can be remotely controlled via a pneumatic switch valve, or it can be programmed to automatically discharge sludge by opening and closing the pneumatic switch valve at intervals. The pretreatment unit's permeate water then enters the denitrification unit via a booster pump.

[0030] Specifically, the first dosing tank contains PAC at a concentration of 100-300 mg / L, and the second dosing tank contains PAM at a concentration of 10-30 mg / L. The mixer speed is set to 45-85 rpm. Four aeration heads can be installed, each with an air volume of 10-30 m³ / min. 3 / h, the screw sludge pump inlet is equipped with a pneumatic valve, which automatically controls the sludge discharge. The sludge discharge time can be set to run for 30~60 minutes and stop for 3~4 hours, alternating between operation.

[0031] 3. Denitrification The pretreatment water flows from bottom to top in the denitrification process. This technical solution controls the environment required by microorganisms in each layer of the denitrification mechanism, so that various strains form dominant bacterial communities inside and outside the packing layer. The microorganisms complete the nitrification and denitrification process inside and outside the packing layer.

[0032] Wastewater treated by the pretreatment unit enters the denitrification unit via a pump. The influent from the pretreatment unit merges with the influent from the denitrification circulation pump. After complete mixing, the two streams enter the denitrification unit through the inlet distributor at the bottom, reducing the influent load on the denitrification unit. An online dissolved oxygen meter monitors the dissolved oxygen concentration in the tank at the bottom of the denitrification unit, ensuring that the dissolved oxygen level meets the requirements for nitrification. An online pH meter monitors the pH in the tank, and an online temperature meter monitors the temperature. These online instruments control the dissolved oxygen at the bottom of the denitrification unit to be 0.5~1.0 mg / L, pH 7.0~8.0, temperature 30~35℃, and MLSS 5~10 g / L. A stirring zone is located in the middle of the denitrification unit, equipped with an online ORP meter and a mixer. The online ORP meter provides direct feedback on the microbial status. The denitrification unit features mixers and horizontally arranged packing layers spaced 2-3 meters apart at the top. The mixers use power to keep the sludge in suspension, preventing sedimentation. The horizontally arranged packing layers contain several stainless steel tennis balls, each containing multiple flexible packing balls. This structure simultaneously provides aerobic, anoxic, and anaerobic environments for microorganisms, allowing for the selection of various dominant bacteria to achieve the necessary conditions for nitrification and denitrification reactions. This is to better remove ammonia nitrogen.

[0033] The principle of nitrification-denitrification denitrification is as follows: Nitrification: NH4 + +1.5O2→NO2 − +2H + +1.87H2O Denitrification: NH4 + +1.32NO2 − +0.066HCO3 - +0.13H + →1.02N2↑+0.26NO3 − +2.03H₂O + 0.066CH₂O 0.5 N 0.15 The nitrification-denitrification denitrification process in this technical solution is as follows: NH4 + →NO2 − Inorganic substances → N2 Ammonia nitrogen is partially oxidized to nitrite. Under anaerobic or hypoxic conditions, ammonia nitrogen is used as an electron donor and inorganic nitrite is used as an electron acceptor, directly converting into nitrogen gas.

[0034] Traditional nitrification-denitrification nitrogen removal technology NH4 + →NO2 − →NO3 − →NO2 −In the NO→N2O→N2 process, removing 1g of ammonia nitrogen requires 4.57g of dissolved oxygen and 2.86g of COD, with a sludge production of 0.3~0.5VSS / gNH4. + -N.

[0035] The proposed nitrification-denitrification denitrification process requires 2.67g of dissolved oxygen to remove 1g of ammonia, requires no additional COD, and produces sludge with a yield of 0.1~0.2 VSS / gNH4. + -N. Compared to traditional nitrification-denitrification processes, removing 1g of ammonia can reduce dissolved oxygen consumption by 41.6% and COD consumption by 100%, and the total sludge production can be reduced by 62.5%. This can significantly reduce the energy consumption and cost of wastewater and sludge treatment, as well as reduce land area and infrastructure costs.

[0036] 4. Aeration response After being treated by the denitrification mechanism, the wastewater enters the aeration reaction mechanism through the upper overflow port. Multiple jet aerators with uniform vertical movement are located at the bottom. The upper flange of each jet aerator connects to an electric expansion joint, which in turn connects to the aeration equipment via pipes. The aeration pipes are equipped with electric gate valves and online flow meters, allowing for automatic adjustment of the aeration rate based on the online dissolved oxygen meter readings. The lower flange of each jet aerator connects to the electric expansion joint, which in turn connects to the water pump outlet via pipes. Gas and liquid are completely mixed inside the jet aerator before being ejected at high speed, increasing dissolved oxygen levels and reducing energy consumption. The vertical movement of the jet aerators ensures uniform distribution of dissolved oxygen in each level of the aeration reaction zone, providing sufficient, stable, and efficient dissolved oxygen for microbial activity.

[0037] Preferably, the dissolved oxygen in the aeration reaction zone is 2~3 mg / L, pH is 7.0~8.0, and the temperature is 30~35℃. It is equipped with multiple jet aerators, which can achieve uniform up-and-down movement of 5~10 mm / min through electric telescopic joints, and the upper and lower ends can travel a distance of 1~2 m.

[0038] 5. Clarify and drain water The effluent from the aeration reaction unit flows by gravity into the effluent outlet unit, which is equipped with an MBR membrane. Sludge-water separation in the clarified effluent zone is achieved through a self-priming drainage pump and the MBR membrane. Preferably, the aeration rate of the effluent outlet unit is 5-10 m³ / h. 3 / min, the MBR membrane used is an immersed curtain membrane, and the membrane length is no more than 2m.

[0039] Online electric gate valves and online flow meters are installed on the pretreatment equipment, denitrification equipment, aeration reaction equipment, and MBR tank aeration pipelines. Through the interlocking program of online electric gate valves, online flow meters, online dissolved oxygen and aeration oxygenation machines, the amount of air required by each tank can be precisely controlled to avoid waste. Compared with the traditional manual adjustment of aeration volume, it can save 20% of power consumption.

[0040] In this invention, wastewater undergoes a pretreatment process to remove suspended solids (SS), phosphorus, heavy metals, etc., before flowing by gravity into the bottom of the denitrification unit. The bottom of the denitrification unit provides a well-controlled microaerobic environment with dissolved oxygen levels controlled to ensure that the dissolved oxygen in the uppermost packing layer is <0.3 mg / L. A temperature of 28-30°C and a pH of 7.0-7.5 are conducive to the survival of target bacteria. Some NH4+ in the wastewater is also removed. + Converted to NO2 − Wastewater passes through multiple layers of packing material. Microorganisms attach to the flexible bodies inside the stainless steel spheres of the packing material layers. Some microorganisms enter the packing spheres inside the flexible bodies, where the packing spheres are in a severely anoxic environment (dissolved oxygen <0.2 mg / L), which is conducive to the survival of denitrifying bacteria. The bacteria survive and accumulate on the packing spheres, utilizing the NO2 in the wastewater. − and NH4 + NH4 + Electron donor, NO2 − As an electron acceptor, NH4 + and NO2 - Simultaneous removal and generation of nitrogen gas to remove NH4 from wastewater + To improve denitrification efficiency, some wastewater from the upper packing layer is recycled to the bottom of the denitrification tank. + +O2→NO2 − +H + +H2O, NH4 + +NO2 − →N2+H2O, COD in wastewater is removed in the aeration reaction zone. The wastewater in the aeration reaction zone flows by gravity to the clarification effluent mechanism, where mud and water separation in the clarification effluent zone is achieved through a self-priming drainage pump and MBR membrane.

[0041] This technical solution controls the microbial living environment at the bottom of the denitrification unit to create an environment conducive to the survival of target bacteria. Under the action of the target bacteria, the NH4 in the wastewater is reduced. + Converted to NO2 − Compared with existing technology (NH4) + →NO2 − →NO3 - Compared to →N2), it shortens the NO2... − The conversion to nitrate reduces oxygen consumption. A packing layer is provided, creating an environment favorable for denitrifying bacteria, which then accumulate within the packing balls. These bacteria utilize NO2 from the wastewater. − and NH4 + NH4 + Electron donor, NO2 − As an electron acceptor, NH4 + and NO2 − Simultaneous removal of nitrogen and generation of nitrogen gas saves on external nutrient solution.

[0042] Application Example 1 The leachate from a municipal landfill has a COD concentration of 1000-2000 mg / L and an ammonia nitrogen concentration of 1500-2500 mg / L. The daily treatment capacity is 200 m³. 3 The leachate treatment station adopts a pretreatment + secondary A / O + external ultrafiltration + nanofiltration process, requiring the addition of 1~1.5 tons of 99% methanol per day, and the power consumption for aeration is 1500~2000 kWh per day. The centrifuge produces 2~5 tons of sludge with 80% moisture content per day.

[0043] During the overhaul of the leachate treatment plant, the denitrification mechanism, aeration reaction mechanism, and clarification effluent mechanism in the secondary A / O modification cost plan were improved to create an environment conducive to the survival of target microorganisms. After two months of commissioning, the system is operating stably, with ammonia nitrogen removal rates of 80%~90% in the denitrification tank and aeration tank. The system effluent ammonia nitrogen is <10mg / L, and total nitrogen is <30mg / L, meeting all discharge requirements. The modified process requires zero methanol addition, consumes 500~1000 kWh / day for aeration, and handles an average of 100~200 kg / day of sludge. Compared to the original process, this technology significantly reduces operating costs.

[0044] Application Example 2 The wastewater from a chemical plant has a COD of 500-1000 mg / L and an ammonia nitrogen concentration of 500-1000 mg / L. The daily treatment capacity is 600 m³. 3 / d, the treatment process adopts pretreatment + A + O + O + submerged MBR. The effluent ammonia nitrogen is ≥80mg / L. It is necessary to add about 2000kg~4000kg of food-grade solid glucose every day to reduce the effluent ammonia nitrogen to below 20mg / L. As long as food-grade solid glucose needs to be added to the influent every day, if it is not added for 3~7 days, the effluent ammonia nitrogen concentration will rise sharply.

[0045] The original A+O+O+submerged MBR process was replaced with the denitrification mechanism, aeration reaction mechanism, and clarification effluent mechanism in this solution. The pretreatment adopts Fenton oxidation + coagulation sedimentation tank, which requires the addition of about 250kg~500kg of food-grade solid glucose per day. The effluent ammonia nitrogen is less than 20mg / L. After 3 months of stable operation, the effluent ammonia nitrogen is consistently below 20mg / L. Compared with the original process, this technical solution significantly reduces the consumption of food-grade glucose, lowers labor costs, reduces carbon emissions, and saves operating costs.

[0046] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A low-carbon treatment device for high ammonia nitrogen wastewater, characterized in that, It includes a filtration unit (1), a pretreatment unit (2), a denitrification unit (3), an aeration reaction unit (4), and an effluent unit (5) connected in sequence. The pretreatment mechanism (2) is provided with a dosing port, and the pretreatment mechanism (2) is provided with an aeration zone and a dosing zone. The aeration zone is provided with an aeration component. The denitrification mechanism (3) is provided with several packing layers (33), and packing balls (333) for nitrification / denitrification are provided in the packing layers (33). The several packing layers (33) are distributed in parallel from top to bottom. A jet aerator (32) is provided at the bottom of the denitrification mechanism (3). The aeration reaction mechanism (4) is equipped with an upliftable aeration component (41) that can move up and down. The water outlet mechanism (5) is equipped with an MBR membrane (51) for solid-liquid separation.

2. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The filtration mechanism (1) includes a filter body, and a filter plate (12) and a high-pressure nozzle (13) are provided inside the filter body. The filter plate (12) is inclined inside the filter body, dividing the filter body into upper and lower spaces. The high-pressure nozzle (13) is located in the lower space. The liquid inlet of the filter body is connected to the upper space, and the liquid outlet of the filter body is connected to the lower space.

3. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 2, characterized in that, The filter body is also provided with a sludge discharge mechanism, which is located at the lowest point of the upper space of the filter body; the filter body is provided with a pressurizing mechanism (11), which is connected to a high-pressure nozzle (13) to provide high-pressure power.

4. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The aeration components inside the pretreatment unit (2) include an air-water mixer (24), an aeration pipe, and an aeration head (23); the outlet of the air-water mixer (24) is connected to the aeration pipe, and the end of the aeration pipe is connected to the aeration head (23); a flow valve (22) is provided on the aeration pipe.

5. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The pretreatment unit (2) is equipped with a sludge discharge assembly and a chemical dosing mixer (21). The sludge discharge assembly includes a sludge discharge pump (25) and a sludge discharge pipe (26). The sludge discharge pipe (26) is horizontally distributed at the bottom of the pretreatment mechanism (2). A sludge inlet is provided on the sludge discharge pipe (26). The sludge discharge pump (25) is connected to the sludge discharge pipe (26).

6. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The packing layer (33) inside the denitrification mechanism (3) includes multiple stainless steel tennis balls (331), and a flexible body (332) is provided inside the stainless steel tennis balls (331). The packing balls (333) are wrapped and filled inside the stainless steel tennis balls (331) by the flexible body (332).

7. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The denitrification mechanism (3) is also equipped with a denitrification circulation pump (31). The bottom of the denitrification mechanism (3) is provided with an inlet and an outlet. The denitrification circulation pump (31) is connected to the outlet through a circulation outlet pipe on one hand and to the inlet through a circulation inlet pipe on the other hand. The outlet pipe of the filter mechanism (1) is connected to the circulation inlet pipe.

8. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The denitrification mechanism (3) is also equipped with an online dissolved oxygen meter, an online OPR meter, a mixer (34) and a water distributor (39). The online dissolved oxygen meter is located at the bottom of the denitrification mechanism (3), and the online OPR meter is located at the top of the denitrification mechanism (3); the mixer (34) is located near the packing layer (33); and the water distributor (39) is located at the bottom of the denitrification mechanism (3).

9. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, The liftable aeration component (41) includes several jet aerators, which are arranged in parallel and can rise or fall synchronously inside the aeration reaction mechanism (4). The aeration reaction mechanism (4) is also equipped with an online dissolved oxygen meter and a water distribution circulation pump (43). The online dissolved oxygen meter is located inside the aeration reaction mechanism (4). The bottom of the aeration reaction mechanism (4) is equipped with an inlet and an outlet. The water distribution circulation pump (43) is connected to the outlet through a circulating water outlet pipe on one hand and to the inlet through a circulating water inlet pipe on the other hand.

10. The low-carbon treatment device for high ammonia nitrogen wastewater according to claim 1, characterized in that, An aeration and oxygenation machine (42) is also installed. The aeration and oxygenation machine (42) is connected to the oxygen-requiring structures in the pretreatment mechanism (2), denitrification mechanism (3), aeration reaction mechanism (4) and effluent mechanism (5) through conveying pipes. The conveying pipes are equipped with valves (35) and flow meters (36).

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