A low-carbon denitrification system based on manganese autotrophic denitrifying bacteria

Abstract

The application relates to the technical field of sewage treatment, and discloses a low-carbon denitrification system based on manganese autotrophic denitrification bacteria, which comprises: a water inlet pretreatment unit used for removing suspended impurities in sewage and adjusting water quality parameters; a bacteria domestication reaction unit in communication with the water inlet pretreatment unit, which is internally provided with a manganese source slow-release layer used for slowly releasing divalent manganese ions and providing bacteria attachment sites, and a bacteria immobilization carrier layer used for efficiently enriching manganese autotrophic denitrification bacteria; and a deep denitrification unit in communication with the bacteria domestication reaction unit and used for further removing residual nitrogen and recovering manganese ions. The application combines the double supply strategies of manganese ore slow release and manganese salt automatic addition, the manganese ore layer serves as a basic and stable Mn 2+ source, ensures the sustainability of long-term operation, the automatic supply unit can quickly respond to the impact of the nitrogen load of the water inlet, ensures the sufficiency of the electron donor, and solves the problem of unstable manganese source supply in the traditional technology.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a system for biological denitrification using manganese autotrophic denitrifying bacteria, which is particularly suitable for deep denitrification treatment of nitrogen-containing wastewater with a low carbon-to-nitrogen ratio. Background Technology

[0002] Eutrophication of water bodies caused by nitrogenous pollutants has become a global environmental challenge. Traditional biological nitrogen removal technologies (such as nitrification-denitrification processes) rely on organic carbon sources as electron donors, which have the following inherent drawbacks: high operating costs (requiring continuous addition of carbon sources such as methanol and sodium acetate), large carbon emissions (external carbon source decomposition produces CO2), and high risk of secondary pollution (excessive carbon source addition leads to excessive COD in effluent). Therefore, developing low-carbon, low-cost nitrogen removal technologies has become a research hotspot in the field of wastewater treatment.

[0003] Manganese autotrophic denitrification technology uses divalent manganese ions (Mn) 2+ Using manganese as an electron donor, manganese-autotrophic denitrifying bacteria reduce nitrates to nitrogen gas. The reaction equation can be simplified as follows: 5Mn 2+ +2NO3-+5H2O→5MnO2+N2+10H + This technology offers several significant advantages: it eliminates the need for external organic carbon sources, reducing operating costs and carbon emissions at the source; manganese is widely available and inexpensive; and the reaction process produces no residual sludge. However, existing manganese autotrophic denitrification technologies still face the following technical bottlenecks in practical applications: 1. Difficulty in microbial enrichment: Manganese autotrophic denitrifying bacteria grow slowly (generation time is about 24-72 hours), are easily lost in traditional suspended growth systems, and are difficult to maintain high biomass in the reactor, resulting in a long system start-up period (usually 2-3 months) and poor operational stability. 2. Unstable manganese source supply: Divalent manganese ions, as electron donors, directly affect denitrification efficiency. Current technologies often employ direct addition of water-soluble manganese salts (such as MnCl2 and MnSO4), which suffers from large fluctuations in dosage, low manganese ion utilization (usually below 50%), and easy exceedance of effluent standards. While using manganese ore as a slow-release manganese source can provide a long-term stable supply of Mn... 2+ It can supply nitrogen, but it cannot cope with the instantaneous impact of nitrogen load in the influent; 3. Low level of system integration: Existing technologies mostly treat manganese autotrophic denitrification as a single treatment unit, lacking system integration with pretreatment, advanced treatment and intelligent control, resulting in unstable effluent quality and high risk of manganese ion residue exceeding the standard; 4. Lack of closed-loop control mechanism: Traditional systems rely on manual experience to adjust operating parameters, and cannot optimize in real time according to the dynamic changes of influent load and effluent water quality, resulting in weak resistance to shock loads; 5. Difficulty in maintaining the activity of the microbial community: During long-term operation, the activity of the functional microbial community naturally declines, and the lack of effective means of microbial community regeneration leads to a gradual decline in system efficiency.

[0004] Therefore, there is an urgent need to develop a dedicated denitrification system with optimized structure, integrated functions, and stable operation to solve the key bottleneck in the transformation of manganese autotrophic denitrification technology from laboratory research to engineering application. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing manganese autotrophic denitrification denitrification systems, such as difficulty in microbial enrichment, unstable manganese source supply, low system integration, and lack of closed-loop control. This invention provides a low-carbon denitrification system based on manganese autotrophic denitrifying bacteria, which achieves efficient and low-carbon treatment of nitrogen-containing wastewater through a dual supply strategy of "manganese ore slow release + automatic manganese salt replenishment", a composite microbial community immobilization design, and an intelligent closed-loop control system.

[0006] This invention proposes a low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria, comprising: The influent pretreatment unit is used to remove suspended impurities from wastewater and adjust water quality parameters; The microbial acclimatization reaction unit is connected to the influent pretreatment unit. It is provided with a manganese source slow-release layer for slow-release of divalent manganese ions and for providing microbial attachment sites, and a microbial immobilization carrier layer for efficient enrichment of manganese autotrophic denitrifying microbial communities. The deep denitrification unit is connected to the microbial culture domestication reaction unit and is used to further remove residual nitrogen and recover manganese ions; The effluent monitoring unit is located at the system's effluent outlet and is used to monitor water quality parameters in real time. The control unit is connected to the influent pretreatment unit, the microbial acclimatization reaction unit, the deep denitrification unit, and the effluent monitoring unit, respectively, and is used to dynamically adjust the system operating parameters based on the monitoring data.

[0007] As a further optimization of the present invention, the microbial acclimatization reaction unit also includes an automatic manganese source replenishment component, which is used to quickly replenish divalent manganese ions during nitrogen load shocks in the influent.

[0008] As a further optimization of the present invention, the manganese source slow-release layer is a manganese ore filler layer, filled with natural manganese ore or artificial manganese-containing materials with a particle size of 5-20mm.

[0009] As a further optimization of the present invention, the microbial community immobilization carrier layer is filled with a porous carrier material, and the surface of the porous carrier material is modified with manganese oxide or iron oxide.

[0010] As a further optimization of the present invention, the deep denitrification unit includes an adsorption layer for adsorbing manganese ions and a denitrification layer for removing residual nitrates.

[0011] As a further optimization of the present invention, the adsorption layer is filled with zeolite, activated carbon, ion exchange resin or a composite material thereof.

[0012] As a further optimization of the present invention, the effluent monitoring unit includes a water quality sensor group for detecting the concentrations of total nitrogen, nitrate nitrogen, nitrite nitrogen, and manganese ions.

[0013] As a further optimization of the present invention, the control unit is a PLC controller or an industrial computer, which has a built-in control algorithm for dynamically adjusting operating parameters based on water quality parameters.

[0014] As a further optimization of the present invention, it also includes a microbial regeneration unit, which is connected to the microbial domestication reaction unit and is used to replenish the nutrient solution in stages to maintain the activity of the microbial community.

[0015] As a further optimization of the present invention, the influent pretreatment unit includes a bar screen filter, a pH adjustment tank, and a dissolved oxygen control module.

[0016] The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria proposed in this invention has the following beneficial effects: 1. It innovatively combines a dual supply strategy of "manganese ore slow release" and "automatic manganese salt replenishment," with the manganese ore layer serving as a foundation and a stable source of Mn. 2+ The source ensures the continuity of long-term operation, while the automatic replenishment unit can quickly respond to the impact of nitrogen load in the influent to ensure sufficient electron donor. This synergistic mechanism helps to significantly improve the utilization rate of manganese ions, thereby solving the problem of unstable manganese source supply in traditional technologies.

[0017] 2. Through the composite immobilization design of "manganese ore packing layer (primary attachment)" and "modified porous ceramic carrier layer (high-efficiency enrichment)," an excellent attachment and growth environment is created for slow-growing manganese autotrophic denitrifying bacteria, which greatly increases the biomass in the reactor, effectively solves the problem of easy loss of bacteria, and significantly shortens the system start-up cycle (from the traditional 2-3 months to about 30 days).

[0018] 3. Thanks to the optimized microbial community structure and precise electron donor supply, the total nitrogen removal rate of the system remains stable at over 85%. At the same time, through the manganese ion adsorption layer of the deep treatment unit, it is ensured that the manganese ion concentration in the effluent meets the strictest national emission standards (≤0.1mg / L).

[0019] 4. The closed-loop control system based on PLC and real-time water quality feedback realizes full-process automated and precise control. It can dynamically optimize operating parameters such as manganese source dosage, reaction cycle, and stirring intensity according to changes in water quality and quantity, giving the system strong resistance to shock loads and ensuring stable operation under various working conditions.

[0020] 5. The device design takes into account the stability, automation and modularity of engineering applications, as well as the visualization, sampling and parameter adjustability of laboratory research. The transparent reactor, removable packing layer and manual / automatic dual-mode control make it an ideal platform from laboratory pilot and pilot-scale to engineering applications. It can be widely used for the treatment of various scenarios such as livestock and poultry breeding wastewater, municipal sewage effluent and industrial nitrogen-containing wastewater.

[0021] 6. No external organic carbon source is required throughout the process, which reduces operating costs and CO2 emissions at the source. The manganese adsorbed by the deep treatment unit can be recycled and reused, achieving efficient reduction of pollutants and recovery of valuable resources, which is highly in line with the national "dual carbon" strategy and the concept of circular economy.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the system flow according to an embodiment of the present invention.

[0024] Explanation of the labels in the diagram: 1. Influent pretreatment unit; 2. Microbial acclimatization reaction unit; 3. Deep denitrification unit; 4. Effluent monitoring unit; 5. Control unit; 6. Microbial regeneration unit. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] Please see Figure 1 The low-carbon denitrification system based on manganese autotrophic denitrifying bacteria proposed in this invention mainly includes an influent pretreatment unit 1, a bacterial acclimatization reaction unit 2, a deep denitrification unit 3, an effluent monitoring unit 4, a control unit 5, and a bacterial regeneration unit 6. Each unit is connected in sequence through pipelines to achieve continuous wastewater treatment.

[0028] I. Inlet Water Pretreatment Unit The influent pretreatment unit 1 is located at the influent end of the system and is used to remove suspended impurities from the wastewater and adjust the water quality parameters to create suitable conditions for subsequent reactions. In this embodiment, the influent pretreatment unit 1 includes a bar screen filter, a pH adjustment tank and a dissolved oxygen control module connected in sequence.

[0029] Bar screen filter: used to remove larger suspended impurities from sewage and protect downstream equipment. Depending on the quality of the influent water, different mesh sizes can be selected, such as 80-200 mesh. In this embodiment, 80 mesh is preferred.

[0030] pH adjustment tank: Equipped with an online pH meter and an automatic dosing system, the pH value of the wastewater is adjusted to 6.5-7.5 using acid or alkali. The preferred acid and alkali are HCl and NaOH, respectively, which are the optimal pH range for the growth of manganese autotrophic denitrifying bacteria. The effective volume of the pH adjustment tank is determined according to the treatment scale, and it is preferably designed based on a retention time of 10-30 minutes.

[0031] Dissolved oxygen control module: Nitrogen stripping or vacuum degassing is used to remove dissolved oxygen from the water, supplemented by low-speed stirring, to control the dissolved oxygen concentration of the influent to ≤0.5mg / L. The manganese autotrophic denitrifying bacteria are facultative anaerobic bacteria, and excessive dissolved oxygen will inhibit their denitrification activity.

[0032] It should be noted that the above-mentioned influent pretreatment unit 1 is mainly used to remove suspended solids, adjust pH and dissolved oxygen, including but not limited to screens, filters, pH adjustment tanks, deoxygenation devices, etc.

[0033] II. Microbial Culture Acclimation Response Unit Microbial culture acclimation reaction unit 2 is connected to influent pretreatment unit 1 and is the core unit for achieving denitrification. Its structure balances experimental operability and engineering practicality. In this embodiment, microbial culture acclimation reaction unit 2 adopts an SBR reactor body, and its volume can be adapted according to the experimental scale or treatment capacity, such as a 50L laboratory scale or a 5m³ scale. 3 For the scale of the project, the reactor body can be made of transparent plexiglass for easy observation, or stainless steel. The reactor wall is equipped with multiple sampling ports for monitoring water quality and biofilm at different heights.

[0034] The reactor is internally equipped with a manganese ore packing layer, an immobilized carrier layer, and auxiliary enhancement components, as detailed below: 1. A manganese ore packing layer is filled in the upper part of the reactor to slowly release divalent manganese ions and provide primary attachment sites for bacteria. In this embodiment, the manganese ore packing layer adopts a slotted detachable structure for easy replacement and cleaning. Natural manganese ore, such as pyrolusite or rhodochrosite, is preferred. The MnO2 content is ≥40%. The ore is crushed and screened, and the particle size is controlled at 5-10mm to ensure sufficient specific surface area and avoid clogging. The thickness of the manganese ore filler layer is 15-20cm, the porosity is 45-55%, and the bottom is supported by a stainless steel mesh with a pore size of 3mm and made of 304 stainless steel. Layered filling can prevent channeling and ensure uniform water flow distribution. Manganese ore slowly releases Mn into water. 2+ This provides a continuous electron donor for manganese autotrophic denitrifying bacteria, while the rough surface of the ore provides sites for the initial attachment of the bacterial community.

[0035] 2. An immobilized carrier layer, located 5 cm below the manganese ore packing layer, is used to efficiently enrich manganese autotrophic denitrifying bacteria. In this embodiment, the immobilized carrier is manganese oxide modified porous ceramic. The carrier material consists of porous ceramic spheres with a diameter of 10-15 mm, modified with manganese oxide. The modification method can be impregnation-calcination, loading manganese oxide onto the ceramic surface to enhance the selective adsorption capacity for manganese autotrophic denitrifying bacteria. The porous structure provides a large specific surface area (≥500 m²). 2 / g), providing ample attachment space for the microbial community, and the manganese oxide modified layer can promote the specific enrichment of the microbial community on the carrier surface.

[0036] The carrier layer is filled to a height of 30cm and supported by a support net at the bottom. A certain gap is left between the carrier layer and the manganese ore layer to prevent the upper ore from settling and crushing the carrier.

[0037] 3. Auxiliary enhancement components include Automatic manganese source replenishment unit: includes manganese salt storage tank, metering pump and liquid level monitor. The manganese salt storage tank contains 0.1-0.5 mol / L MnCl2 or MnSO4 solution. The metering pump is controlled by control unit 5 and dynamically adjusts the dosage according to the total nitrogen concentration of the influent and the manganese ion concentration of the effluent. This unit is used to cope with the instantaneous impact of nitrogen load on the influent and forms a dual supply strategy of "basic + emergency" with the slow release of manganese ore. Temperature control module: The reactor jacket circulating water bath or electric heating element is used to maintain the reaction temperature at 25-30℃, which is the optimal growth temperature range for manganese autotrophic denitrifying bacteria. The stirring system adopts a top-mounted variable frequency speed-regulating stirrer. The stirring blades are located above the immobilized carrier layer to prevent damage to the carrier. The stirring speed is 20-200 rpm and is dynamically adjusted according to the ORP (oxidation-reduction potential) sensor signal to ensure mass transfer efficiency while avoiding excessive shearing that could damage the biofilm.

[0038] It should be noted that the microbial community domestication reaction unit 2 is mainly used for the enrichment of manganese autotrophic denitrifying microbial communities and denitrification reactions, including but not limited to SBR reactors, continuous flow reactors, membrane bioreactors, etc. The manganese ore filler layer refers to the area filled with natural manganese ore for the slow release of Mn. 2+ And bacterial colony attachment; Immobilized carrier layer refers to the area filled with porous carrier, used for efficient enrichment of microbial communities, including but not limited to modified porous ceramics, activated carbon, biochar, polymer carriers, etc.

[0039] III. Deep Denitrification Unit The deep denitrification unit 3 is connected to the microbial culture domestication reaction unit 2, and is used to further remove residual nitrogen and recover manganese ions. In this embodiment, the deep denitrification unit 3 adopts a columnar structure and has the following functional layers inside: 1. Manganese ion adsorption layer: Filled at the bottom of the unit, 30-50cm thick, with an empty bed residence time of 15-30min. The adsorption material is a zeolite-activated carbon composite material, utilizing the synergistic effect of the ion exchange performance of zeolite and the adsorption performance of activated carbon to efficiently adsorb residual Mn in the water. 2+ After adsorption saturation, manganese resources can be recovered through acid washing or salt washing. 2. Terminal denitrification chamber: Located above the manganese ion adsorption layer, the chamber is filled with anaerobic microbial packing material, such as polyurethane foam carrier, and loaded with denitrifying functional bacteria. This chamber is used to further remove residual nitrates and ensure that the total nitrogen in the effluent meets the standards.

[0040] It should be noted that the deep denitrification unit 3 is mainly used to enhance nitrogen removal and manganese recovery, including but not limited to adsorption layer, ion exchange layer, membrane separation unit, etc.

[0041] IV. Water Outflow Monitoring Unit The water outlet monitoring unit 4 is located at the water outlet of the system and is used to monitor water quality parameters in real time. In this embodiment, the water outlet monitoring unit 4 includes a water quality sensor group and a data transmission module.

[0042] 1. Water quality sensor group: including online total nitrogen monitor, nitrate nitrogen sensor, nitrite nitrogen sensor and manganese ion sensor, which can use ion-selective electrode method, spectrophotometry or electrochemical sensor principle to detect the water quality in real time; 2. Data transmission module: Transmits sensor detection data to control unit 5 in real time, providing feedback signals for closed-loop control.

[0043] It should be noted that the effluent monitoring unit 4 is mainly used for real-time detection of effluent water quality, including but not limited to online sensors, sampling analyzers, and data transmission modules.

[0044] V. Control Unit The control unit 5 is connected to the influent pretreatment unit 1, the microbial acclimatization reaction unit 2, the deep denitrification unit 3, and the effluent monitoring unit 4 respectively. It is used to dynamically adjust the system operating parameters according to the monitoring data. In this embodiment, the control unit 5 adopts a PLC controller and has a built-in control algorithm for dynamically adjusting the operating parameters based on water quality parameters.

[0045] 1. Hardware configuration: The PLC controller has analog input / output modules and digital input / output modules, which can be connected to various sensors and actuators. It is equipped with a touch screen human-machine interface, supports manual mode and automatic mode switching, and is suitable for parameter optimization and process verification needs during the experiment. 2. Control Algorithm: Built-in PID control or fuzzy control algorithm, dynamically adjusts the following parameters based on the influent total nitrogen concentration, effluent total nitrogen concentration, and effluent manganese ion concentration: Manganese source dosage: When the total nitrogen in the effluent increases, the MnCl2 dosage will be automatically increased; Reaction cycle: Adjust the SBR cycle according to the influent load (e.g., 4-12 hours); Stirring intensity: Adjust the stirring speed according to the ORP signal to optimize mass transfer efficiency; Feedback threshold: When the total nitrogen concentration in the effluent exceeds 15 mg / L or the manganese ion concentration exceeds 0.1 mg / L, the control unit automatically adjusts the operating parameters. If the adjustment still fails to meet the standards, an alarm signal is issued.

[0046] It should be noted that control unit 5 is mainly used for system automation control, including but not limited to PLC, microcontroller, industrial computer, distributed control system, etc.

[0047] VI. Microbial Regeneration Unit The microbial regeneration unit 6 is connected to the microbial domestication reaction unit 2 and is used to replenish the nutrient solution in stages to maintain the activity of the microbial community. In this embodiment, the microbial regeneration unit 6 is equipped with a nutrient solution storage tank containing trace elements (such as Fe). 2+ Mo 2+ Co 2+ (etc.) and low concentrations of Mn 2+ The solution is replenished to the reactor periodically by a diaphragm pump controlled by a PLC, such as once every 15 days, adding 5L of nutrient solution.

[0048] This unit can solve the problems of bacterial population loss and activity decay during long-term operation, and maintain the stability of denitrification performance.

[0049] The working process of this invention is as follows: Influent pretreatment: Raw water first enters influent pretreatment unit 1, where suspended impurities are removed by bar filtration, the pH is adjusted to 6.5-7.5 in the pH adjustment tank, and the dissolved oxygen (DO) is reduced to ≤0.5 mg / L by the dissolved oxygen control module to create suitable conditions for subsequent reactions; Microbial acclimatization and denitrification reaction: Pretreated water enters microbial acclimatization reaction unit 2. In the SBR reactor, the water flows sequentially through the manganese ore packing layer and the immobilized carrier layer, where the manganese ore slowly releases Mn. 2+ It provides electron donors for manganese autotrophic denitrifying bacteria, and the immobilized carrier efficiently enriches the bacterial community to form a high-density biofilm. Under the control of the control unit 5, the reactor operates in a sequential batch process (influent-reaction-sedimentation-drainage) to complete the conversion of nitrate to nitrogen. Advanced treatment: The reactor effluent enters the advanced denitrification unit 3, where residual Mn is first adsorbed by the manganese ion adsorption layer. 2+ The residual nitrate is further removed in the final denitrification chamber to ensure that the effluent meets the standards; Effluent monitoring and feedback: Effluent monitoring unit 4 detects the concentrations of total nitrogen, nitrate nitrogen, nitrite nitrogen and manganese ions in the effluent in real time, and the data is fed back to control unit 5 through data transmission module; Closed-loop control: The control unit 5 dynamically adjusts the operating parameters of the microbial acclimatization reaction unit 2 based on feedback data, such as the amount of manganese source added, reaction cycle, and stirring intensity, forming a "monitoring-feedback-control" closed loop; Microbial regeneration: Microbial regeneration unit 6 replenishes nutrient solution to microbial acclimatization reaction unit 2 according to a preset cycle to maintain microbial activity.

[0050] The scope of protection of this invention is not limited to the specific embodiments described above. Several typical variations are listed below, all of which fall within the scope of protection of this invention: Variant 1: Replacement of reactor form Microbial culture acclimatization reaction units are not limited to SBR reactors; they can also be used in various forms such as continuous flow stirred reactors (CSTRs), membrane bioreactors (MBRs), and biofilters. For large-scale engineering applications, plug flow reactors can be used to improve treatment efficiency.

[0051] Variation 2: Replacement of manganese ore filler Manganese ore fillers are not limited to natural manganese ore; artificial manganese slag, manganese-modified zeolite, manganese oxide-supported ceramsite, and other manganese-containing materials can also be used. The particle size of the ore can be adjusted according to the reactor size and hydraulic conditions (e.g., 5-20 mm).

[0052] Variation 3: Replacement of Immobilized Carriers The immobilization carrier is not limited to modified porous ceramics, but can also be made of various materials such as activated carbon, biochar, polyurethane foam, polyethylene suspension filler, and carbon fiber. The modification method of the carrier is not limited to manganese oxide loading, but can be modified by composite modification of iron oxide, titanium oxide, etc.

[0053] Variant 4: Replacement of deep denitrification unit The deep denitrification unit is not limited to the combination of adsorption layer and denitrification chamber. It can also use a variety of technologies such as membrane separation, ion exchange, and electrochemical oxidation to achieve manganese recovery and deep nitrogen removal.

[0054] Variation 5: Extension of Control Algorithm The control algorithm is not limited to PID control. It can integrate artificial intelligence algorithms (such as neural networks, fuzzy control, and expert systems) to establish a correlation model between influent water quality and optimal operating parameters through machine learning, thereby achieving intelligent predictive control.

[0055] Variation 6: Expansion of Application Areas This invention is not only applicable to domestic sewage with low carbon-to-nitrogen ratio, but can also be applied to various nitrogen-containing wastewater treatment scenarios such as livestock and poultry breeding wastewater, industrial nitrogen-containing wastewater, landfill leachate, and aquaculture wastewater.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria, characterized in that, include: The influent pretreatment unit is used to remove suspended impurities from wastewater and adjust water quality parameters; The microbial acclimatization reaction unit is connected to the influent pretreatment unit. It is provided with a manganese source slow-release layer for slow-release of divalent manganese ions and for providing microbial attachment sites, and a microbial immobilization carrier layer for efficient enrichment of manganese autotrophic denitrifying microbial communities. The deep denitrification unit is connected to the microbial culture domestication reaction unit and is used to further remove residual nitrogen and recover manganese ions; The effluent monitoring unit is located at the system's effluent outlet and is used to monitor water quality parameters in real time. The control unit is connected to the influent pretreatment unit, the microbial acclimatization reaction unit, the deep denitrification unit, and the effluent monitoring unit, respectively, and is used to dynamically adjust the system operating parameters based on the monitoring data.

2. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The microbial acclimatization reaction unit also includes an automatic manganese source replenishment component, which is used to quickly replenish divalent manganese ions during nitrogen load shocks in the influent.

3. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The manganese source slow-release layer is a manganese ore filler layer, filled with natural manganese ore or artificial manganese-containing materials with a particle size of 5-20mm.

4. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The microbial community immobilization carrier layer is filled with a porous carrier material, the surface of which is modified with manganese oxide or iron oxide.

5. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The deep denitrification unit includes an adsorption layer for adsorbing manganese ions and a denitrification layer for removing residual nitrates.

6. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 5, characterized in that, The adsorption layer is filled with zeolite, activated carbon, ion exchange resin or a composite material thereof.

7. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The effluent monitoring unit includes a set of water quality sensors for detecting the concentrations of total nitrogen, nitrate nitrogen, nitrite nitrogen, and manganese ions.

8. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The control unit is a PLC controller or an industrial computer, with a built-in control algorithm that dynamically adjusts operating parameters based on water quality parameters.

9. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, It also includes a microbial regeneration unit, which is connected to the microbial domestication reaction unit, and is used to replenish the nutrient solution in stages to maintain the activity of the microbial community.

10. The low-carbon nitrogen removal system based on manganese autotrophic denitrifying bacteria according to claim 1, characterized in that, The influent pretreatment unit includes a bar screen filter, a pH adjustment tank, and a dissolved oxygen control module.

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