An industrial nitrogen-containing wastewater low-carbon modular biological nitrogen removal treatment system and method

Abstract

The present invention discloses a low-carbon modular biological denitrification treatment system and method for industrial nitrogen-containing wastewater, which belongs to the technical field of industrial wastewater treatment. The low-carbon modular biological denitrification treatment system includes a PNA integrated micro-aerobic reactor, a sludge screening device and a composite functional bacteria multiplication device connected in sequence. The denitrification method is: inoculating short-range nitrification anaerobic ammonia oxidation granular sludge in the PNA integrated micro-aerobic reactor, realizing low-carbon denitrification in a micro-aerobic environment, and separating the precipitated sludge into flocculent and granular sludge through a screening device. The flocculent sludge is transported to a composite functional bacteria multiplication device for enrichment. By cultivating composite functional bacteria suitable for a specific industrial nitrogen-containing wastewater environment, the system can maintain a relatively high biomass, and can maintain a stable and good treatment effect even in the face of wastewater quality fluctuations or shock loads.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial wastewater treatment, and in particular to a low-carbon modular biological denitrification treatment system and method for industrial nitrogen-containing wastewater. Background Art

[0002] The main sources of industrial nitrogen-containing wastewater include organic nitrogen wastewater generated in fine chemical fields such as pesticides and pharmaceuticals. This type of wastewater not only has a high nitrogen concentration, but also contains high concentrations of organic matter, heavy metals, fluorine, salt and other pollutants. The water quality is complex, which increases the difficulty of treatment and denitrification technology of industrial nitrogen-containing wastewater.

[0003] At present, the mainstream treatment strategy for industrial organic nitrogen wastewater combines advanced oxidation and biological treatment technologies, aiming to improve biodegradability and gradually convert nitrogen-containing organic compounds in the wastewater into ammonia nitrogen. Therefore, the challenge of treating organic nitrogen industrial wastewater ultimately focuses on the efficient and stable removal of ammonia nitrogen. In recent years, due to the high aeration energy consumption, large amount of sludge, and the need to add carbon sources in traditional nitrification and denitrification processes, the energy consumption and carbon emissions of sewage treatment plants have increased. The coupling processes such as short-term nitrification-anaerobic ammonium oxidation (PNA) and partial denitrification-anaerobic ammonium oxidation (PDA) with anaerobic ammonium oxidation as the core have broken the fact that anaerobic ammonium oxidation is affected by NO2 - -N electron limitation has improved the feasibility of this technology for practical engineering applications, and has gradually become a new mainstream process for low-carbon biological denitrification.

[0004] Among them, the PNA process has made great progress and breakthroughs in the treatment of ammonia-nitrogen wastewaters such as municipal sewage and landfill leachate, but its application in industrial nitrogen-containing wastewater still faces many challenges. Due to the complex water quality of industrial nitrogen-containing wastewater, in addition to inorganic nitrogen, it also contains high concentrations of difficult-to-degrade organic nitrogen compounds such as DMF, acetonitrile, pyridine, and organic amine metal complexes. These substances have varying degrees of inhibitory effects on the growth, reproduction, and metabolic activity of microorganisms, resulting in an imbalance in the proliferation and decay rates of microorganisms in the system, interfering with the balance and stability of the microbial population, and thus affecting the biological denitrification efficiency and long-term operational stability of the PNA process. At the same time, due to the slow growth of anaerobic ammonia-oxidizing bacteria, the difficulty of enrichment and cultivation, and their sensitivity to environmental fluctuations, the system's ability to recover after being impacted is limited, resulting in a long recovery period.

[0005] In summary, in order to promote the engineering application of PNA process in the treatment of industrial nitrogen-containing wastewater, the following issues need to be urgently addressed: (1) Strengthening the microbial activity and population structure of the PNA system to improve the denitrification effect and operational stability of the process; (2) Developing efficient and rapid microbial enrichment and recovery technologies to ensure that the anaerobic ammonia oxidation and AOB functional bacteria in the system maintain a stable biomass, improve the system's ability to cope with shock loads, and shorten the recovery cycle; (3) Developing modular biological denitrification treatment technology and equipment that can be flexibly applied to different scenarios to meet the treatment needs of different scales. Summary of the Invention

[0006] The Summary of the Invention outlines a series of key concepts presented in simplified form, forming the fundamental framework of the invention. The Detailed Implementation section then provides a detailed explanation and elaboration of these simplified concepts, revealing their technical details, operational processes, and practical applications.

[0007] Based on the problems that need to be solved urgently in the background technology, the present invention provides a low-carbon modular biological denitrification treatment system for industrial nitrogen-containing wastewater, including a PNA integrated micro-aerobic reactor, a sludge screening device, and a composite functional bacteria multiplication device connected in sequence.

[0008] The PNA integrated micro-aerobic reactor is used to convert part of the ammonia nitrogen in the sedimentation tank effluent after conventional anaerobic-A / O biological treatment into NO2 - And consume oxygen, further converting NH4 in the system + NO2 produced by short-range nitrification - Converted into N2 and a small amount of NO3 - The effluent from the PNA integrated micro-aerobic reactor is returned to the anoxic tank of the primary A / O biochemical combination pool, and the wastewater is denitrified by denitrification using organic matter in the wastewater as a carbon source, with a reflux ratio of 1:1 to 2:1;

[0009] The PNA integrated micro-aerobic reactor comprises a submersible stirring device, a sodium carbonate automatic dosing device, an immobilized biological activity stimulating carrier filler, a micro-aerobic aeration device, a sludge settling tank, and an online monitoring device;

[0010] Furthermore, the submersible stirring device is used to uniformly mix mud and water;

[0011] Furthermore, the automatic sodium carbonate dosing device is used to automatically add sodium carbonate solution to maintain the pH of the PNA system stable between 7.0 and 8.0;

[0012] Furthermore, the immobilized bioactive stimulating carrier filler is used to maintain and enhance the bioactivity of the functional bacterial flora in the PNA system. The immobilized bioactive stimulating carrier filler is a nZVI-polyethylene / activated carbon composite carrier, which uses high-density polyethylene (HDPE) material as the skeleton, activated carbon and nano-zero-valent iron (nZVI) as functional materials, and is prepared by a high-temperature extrusion air cooling molding method; by loading nano-zero-valent iron, it stimulates the formation of denitrification functional genes such as Heme c in anaerobic ammonia oxidizers, promotes the progress of electron transfer reactions, increases the specific growth rate of anaerobic ammonia oxidizing bacteria, and accelerates the formation of biofilms; thus achieving enhanced metabolic activity of functional bacteria and improved denitrification efficiency;

[0013] Furthermore, the micro-oxygen aeration device is used to provide oxygen. The micro-oxygen aeration device is a liftable membrane aeration tube, which is installed in the middle of the immobilized biological activity stimulating carrier filler and is laterally spaced 0.2 to 0.5 m from the immobilized biological activity stimulating carrier filler.

[0014] Furthermore, the sludge sedimentation tank is used for sedimentation and separation of the mud-water mixture;

[0015] Furthermore, the online monitoring device is used for online data collection and feedback intelligent control to build a PNA optimal environment system. The online monitoring device includes DO, ORP, and MLSS online monitors.

[0016] The sludge screening device is used to screen and separate flocculent and granular sludge. The sludge screening device is arranged at the lower end of the sludge settling tank of the PNA integrated micro-aerobic reactor. The sludge screening device includes a housing, the upper end of which is provided with a sludge inlet pipe, which is connected to the sludge outlet at the lower end of the settling tank. A control valve is provided in the sludge inlet pipe.

[0017] Furthermore, a filter is inserted into the shell, the shell is rotatably connected to the baffle, the front end of the baffle is against the edge of the filter, a protrusion is provided on the side of the filter, and a first conical hopper and a second conical hopper are fixed in parallel at the lower end of the shell. The lower end of the first conical hopper is connected to the composite biological multiplication device through a first discharge pipe, and the lower end of the second conical hopper is connected to the PNA integrated micro-aerobic reactor through a second discharge pipe.

[0018] The composite functional bacteria multiplication device is used for multiplying AOB and anaerobic ammonification bacteria and serves as a self-cultivation system for functional bacteria in the PNA denitrification system. The composite functional bacteria multiplication device includes an enrichment culture tank, a culture fluid feeding device, a concentration system, and a monitoring and control system.

[0019] The effective volume of the enrichment culture tank is 1 / 100 to 1 / 50 of the effective volume of the PNA integrated micro-aerobic reactor, and the inoculated sludge comes from the flocculent sludge screened by the PNA integrated micro-aerobic reactor;

[0020] The effective volume of the culture fluid feeding device is 1 / 4 to 1 / 2 of the effective volume of the enrichment culture tank, and the culture fluid components include matrix solution, trace elements, inorganic salts, and industrial nitrogen-containing wastewater;

[0021] The concentration system is used to concentrate the mature bacterial strains so that they can be regularly added to the PNA microaerobic reactor later;

[0022] The monitoring and control system includes automatic monitoring and control of DO, pH and temperature.

[0023] Furthermore, the monitoring and control system performs the following operations:

[0024] Obtain the control path of the monitoring target;

[0025] Obtaining the control strategy of the control path;

[0026] Determine the adjustment model of the monitoring target according to the control strategy of the control path;

[0027] Extract monitoring features based on a preset monitoring feature extraction template;

[0028] Make automatic adjustments based on monitoring characteristics and adjustment models;

[0029] Among them, according to the control strategy of the control path, the adjustment model of the monitoring target is determined, including:

[0030] Obtain control results of control strategies;

[0031] Obtain control timing information of the control path;

[0032] Determine the interference path and interference factor based on the control results and control timing information;

[0033] Obtain the control strategy correction library for interference paths;

[0034] Determine the correction control strategy based on the control strategy correction library of the interference path and the interference factor of the interference path;

[0035] Determine the adjustment model of monitoring targets according to the revised control strategy;

[0036] Among them, the control strategy correction library for obtaining the interference path includes:

[0037] Obtain manual control records of monitoring targets;

[0038] Expanding the manual conversation during manual control recording on a preset time axis to obtain multiple conversation items;

[0039] Match the dialogue item with the preset standard modified semantic item. If there is a match, use the corresponding dialogue item as the target dialogue item.

[0040] Determine a first extraction party of dialogue items that are a preset first number of dialogue items before a target dialogue item on a time axis;

[0041] determining whether the first extraction party is different from the second extraction party of the target dialogue item;

[0042] If there is a difference, obtain the conversation item of the second extracted party after the target conversation item and use it as the analysis item;

[0043] If there is no difference, taking the dialogue items of a preset second number of dialogue items before and after the target dialogue item on the timeline as question semantic matching items, and attempting to search for the question semantic item in the question semantic matching items;

[0044] If the query semantic item search fails, the query semantic matching item is used as the analysis item;

[0045] If the query semantic item search is successful, the conversation item of the third extraction party who spoke closest to the second extraction party after the target conversation item is obtained as the analysis item;

[0046] The analysis items are input into the semantic analysis model, and a control strategy correction library is constructed based on the analysis results.

[0047] Furthermore, the monitoring and control system also performs the following operations:

[0048] Optimize the control range of monitoring targets;

[0049] The control scope of the optimized monitoring objectives includes:

[0050] Obtaining the biological growth status in the composite biological multiplication device;

[0051] Extracting biological growth characteristics based on a preset biological growth characteristic extraction template corresponding to the biological species;

[0052] Construct an initial matrix based on biological growth characteristics;

[0053] Obtain ideal biological growth characteristics;

[0054] Construct a target matrix based on ideal biological growth characteristics;

[0055] Determine the biological growth control model based on historical biological growth control records;

[0056] Based on the biological growth control model, the initial matrix is used as the model input and the target matrix is used as the model output to calculate the biological growth control parameters of the model;

[0057] The control range is adjusted according to the control parameters of the biological growth conditions to obtain the optimized control range of the monitoring target.

[0058] The present invention further provides a low-carbon modular biological denitrification treatment method for industrial nitrogenous wastewater, which is used in the above-mentioned low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater, comprising the following steps:

[0059] S1. Low-carbon biological denitrification: The effluent after conventional pretreatment and anaerobic-A / O biological treatment is sent to the PNA integrated micro-aerobic reactor. The reactor is inoculated with mature short-range nitrification anaerobic ammonium oxidation granular sludge. AOB bacteria and Anammox bacteria form a gradient distribution in the granular sludge, that is, the AOB bacteria content is higher in the surface layer, and Anammox gradually becomes the main position towards the center of the granular sludge; AOB bacteria on the surface of the granular sludge preferentially carry out short-range nitrification to convert ammonia nitrogen into NO2 - And consume oxygen, making the anaerobic ammonia oxidizing bacteria inside the system in an anaerobic state, and converting NH4 + NO2 produced by short-range nitrification - Converted into N2H4, and further converted into N2 and a small amount of NO3 - The PNA effluent is returned to the A / O combined anoxic tank, where denitrification is carried out using organic matter in the wastewater as a carbon source, converting a small amount of NO3 - Converted into N2 to achieve low-carbon denitrification;

[0060] S2. Sludge Screening: The sludge-water mixture generated during the operation of the PNA integrated micro-aerobic reactor is settled in a sludge settling tank. The settled sludge is separated by a sludge screening device. The flocculent sludge is transported to a composite functional bacteria multiplication device for enrichment and cultivation, and the granular sludge is returned to the PNA integrated micro-aerobic reactor.

[0061] S3. Enrichment of composite functional bacteria: The composite functional bacteria multiplication device serves as the self-cultivation system of the functional bacteria of the PNA denitrification system. It uses the flocculent sludge of the PNA system as the inoculum, and regularly adds mature bacteria that are adapted to the specific water quality environment into the PNA integrated micro-aerobic reactor to maintain the stable biomass of the PNA system and improve the system stability and resistance to shock loads.

[0062] Furthermore, in step S1, the COD concentration of the influent of the PNA integrated microaerobic reactor is 300-1000 mg / L, the TN concentration is 200-600 mg / L, and the organic nitrogen content is less than 10%; the sludge concentration is 8-10 g / L, and the system pH value is maintained at 7.0-8.0 by an online pH and sodium carbonate automatic dosing device, the dissolved oxygen concentration is 0.5-1.5 mg / L, the reaction temperature is 20-35° C., and the hydraulic retention time is 1-4 days;

[0063] The immobilized bioactive stimulating carrier filler is a nZVI-polyethylene / activated carbon composite carrier, and the addition ratio is 20% to 40%;

[0064] The PNA effluent is returned to the A / O combined pool anoxic pool with a return ratio of 1:1 to 2:1.

[0065] Furthermore, in step S3, the DO concentration of the composite functional bacteria multiplication device is controlled at 0.5-1.5 mg / L, the pH is controlled at 7.0-8.0, and the temperature is controlled at 25-30°C;

[0066] The particle size of mature granular sludge in the composite functional bacteria multiplication device is 2 to 8 mm;

[0067] The dosage of composite functional bacteria is 1‰ to 5‰ of the effective volume of the PNA microaerobic reactor, and it is added once every one to two months.

[0068] Beneficial effects of the present invention:

[0069] (1) The present invention achieves low-carbon treatment of industrial nitrogen-containing wastewater through the synergistic effect of multiple biological treatment stages. In the PNA integrated reactor, short-range nitrification and anaerobic ammonium oxidation are utilized to achieve efficient denitrification of wastewater under micro-aerobic aeration conditions. Furthermore, organic matter in the wastewater is utilized through PNA effluent recirculation to further remove nitrate nitrogen. This process does not require the addition of an external carbon source, thereby reducing energy and carbon source consumption, while also reducing carbon emissions and meeting green environmental protection requirements.

[0070] (2) The present invention uses a nZVI-polyethylene / activated carbon composite carrier to enhance the biological activity of anaerobic ammonia oxidation, improve the denitrification performance, and increase the stability of the system.

[0071] (3) The present invention adopts a multiplication device of composite functional bacteria as a PNA self-cultivation system. By enriching short-range nitrification anaerobic ammonia oxidation composite functional bacteria suitable for a specific industrial nitrogen-containing wastewater environment, the system can maintain a high biomass. Even in the face of wastewater quality fluctuations or shock loads, it can still maintain a stable and good treatment effect.

[0072] (4) The present invention adopts a modular biological denitrification treatment equipment including a PNA integrated micro-aerobic reactor, a sludge screening device, and a composite functional bacterial multiplication device, which has the advantages of standardization and flexibility and can be applied to different industrial nitrogen-containing wastewater treatment scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] The accompanying drawings are used to further explain the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0074] Figure 1 A process roadmap for a low-carbon modular biological denitrification treatment method for industrial nitrogen-containing wastewater provided in an embodiment of the present invention.

[0075] Figure 2This is a schematic diagram of the structural connection of the PNA integrated micro-aerobic reactor and the composite functional bacteria multiplication device provided in an embodiment of the present invention.

[0076] Figure 3 This is a microscopic examination of the short-range nitrification and anaerobic ammonium oxidation granular sludge enriched by the composite functional bacteria multiplication device provided in an embodiment of the present invention.

[0077] Figure 4 This is a Genus taxonomic composition diagram of high-throughput sequencing of granular sludge enriched by the composite functional bacterial multiplication device provided in an embodiment of the present invention.

[0078] Figure 5 Schematic diagram of the sludge screening device provided in the embodiment of the present invention Figure 1 .

[0079] Figure 6 Schematic diagram of the sludge screening device provided in the embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0080] The technical solution of the present invention is further described in detail below with reference to specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0081] Example 1

[0082] The nitrogen-containing wastewater containing DMF, acetonitrile and triethylamine generated in the production process of fipronil and other products of a pesticide technical enterprise was treated. The water quality of the enterprise's wastewater is shown in Table 1. The COD concentration of the wastewater is about 30,000-45,000 mg / L, and the TN concentration is between 6,000 and 10,000 mg / L.

[0083] Table 1 Summary of nitrogen-containing wastewater quality tests at a pesticide technical manufacturer (unit: mg / L, pH dimensionless)

[0084]

[0085] A low-carbon modular composite biological denitrification treatment method comprises the following steps:

[0086] In the first advanced oxidation pretreatment stage, the nitrogen-containing wastewater is heated and pressurized before entering the wet catalytic oxidation reactor at a temperature of 230-280°C and a pressure of 5-8 MPa. The wet catalytic oxidation effluent has a COD concentration of 8030 mg / L, a TN concentration of 3715 mg / L, and an ammonia nitrogen concentration of 2420 mg / L.

[0087] In the second step, homogenization and conditioning, wastewater from wet catalytic oxidation, domestic sewage, floor washing water, and equipment cleaning water is piped to a comprehensive biochemical conditioning tank. Liquid caustic soda is added to adjust the pH to 7.0, and homogenization is performed using a submersible agitator. After homogenization, the wastewater has a COD concentration of 4519 mg / L, a TN concentration of 953 mg / L, and an ammonia nitrogen concentration of 705 mg / L. The wastewater is then pumped to the anaerobic-anoxic-aerobic reaction tank via a lift pump.

[0088] The third step, the anaerobic-A / O biological treatment phase, involves the effluent from the integrated biochemical conditioning tank being pumped into the UASB anaerobic bioreactor via an inlet lift pump. The effluent is maintained at a sludge concentration (MLSS) of 5000 mg / L, a temperature of 30°C, a pH of 7.0, and a hydraulic retention time (HRT) of 3 days. The effluent from the UASB anaerobic tank flows sequentially by gravity to the anoxic and aerobic tanks, with a HRT of 1.5 days in the anoxic tank and 4 days in the aerobic tank. During this phase, nitrogen-containing organic matter is fully ammonified, effectively degrading organic matter in the wastewater and reducing COD. The effluent COD concentration is 650 mg / L, TN concentration is 525 mg / L, and ammonia nitrogen concentration is 475 mg / L.

[0089] The fourth step is sedimentation and sludge return stage: the effluent from the aerobic tank is precipitated in the sedimentation tank, the supernatant flows into the PNA integrated micro-aerobic reactor, and the bottom sludge is returned to the A / O combination tank through the sludge pump.

[0090] The fifth step is low-carbon denitrification: the supernatant effluent from the sedimentation tank flows by gravity into the PNA integrated micro-aerobic reactor. The average particle size of the mature granular sludge inoculated in the reactor reaches 3.5mm. The nZVI-polyethylene / activated carbon biological activity stimulation carrier is placed in the reactor, and the carrier addition ratio is 30%. The micro-aerobic environment is maintained in the PNA reactor, and the dissolved oxygen (DO) concentration is about 1.0mg / L. The AOB bacteria on the surface of the granular sludge use oxygen to preferentially carry out short-range nitrification to convert NH4 + Partially converted to NO2 - , creating an anaerobic environment for the anaerobic ammonia-oxidizing bacteria inside the granular sludge, while NH4 + and NO2 - It is further transferred to anaerobic ammonium oxidizing bacteria and eventually converted into N2 and a small amount of NO3 - , the PNA effluent is returned to the anoxic tank with a return ratio of 2:1.

[0091] The reactor is equipped with an online pH control and an automatic sodium carbonate dosing device. The online pH control is interlocked with the dosing pump to automatically control the dosing amount while maintaining the pH at around 7.5. The reactor temperature is 32°C and the hydraulic retention time is 4 days.

[0092] The mud-water mixture generated during the operation of the PNA integrated micro-aerobic reactor is settled through the sludge settling tank. The settled sludge is screened and separated by the sludge screening device, and the flocculent sludge is transported to the enrichment culture tank. The effective volume of the tank is 10m 3 A mixed culture solution of substrate solution, trace elements, inorganic salts, and industrial nitrogen-containing wastewater was added through the culture solution distribution system. An automatic DO, pH, and temperature monitoring and control system was set up. The DO concentration in the enrichment culture tank was maintained at 1.0 mg / L, the pH was 7.5, and the temperature was 28°C. For mature strains, the dosage was 2‰ of the effective volume of the PNA microaerobic reactor, with additions made twice a month.

[0093] The COD concentration of PNA effluent is 295 mg / L, the TN concentration is 40 mg / L, and the ammonia nitrogen concentration is 19 mg / L, which stably meets the takeover standards of the park where the enterprise is located.

[0094] The water quality of the treated wastewater is shown in Table 2.

[0095] Table 2 Treatment results of nitrogen-rich organic wastewater from a pesticide technical manufacturer (unit: mg / L)

[0096]

[0097]

[0098] In one embodiment, the monitoring and control system performs the following operations:

[0099] Obtain the control path of the monitoring target; the monitoring targets include: DO parameters, pH parameters, and temperature parameters; the control path is: the communication link of the control device corresponding to the monitoring target, such as: the communication link of the control center of the DO adjustment device (microporous aerator, aeration rotary disk, and rotary brush), the communication link of the control center of the pH adjustment device, and the communication link of the control center of the temperature adjustment device (cooling tower, heating equipment);

[0100] Obtaining the control strategy of the control path; wherein the control strategy is the control logic of the control path, indicating what is monitored and what is output, and its corresponding rules are preset manually;

[0101] Determine an adjustment model for the monitoring target based on the control strategy of the control path; the adjustment model is an AI model that adaptively controls the data range of the monitoring target based on the data of the monitored monitoring target. The AI model learns the control logic of the control strategy and implements automated control based on the monitoring results.

[0102] Extracting monitoring features based on a preset monitoring feature extraction template; wherein the preset monitoring feature extraction template is a preset template for extracting key data features from the monitoring data, the key data features being: whether the monitoring data range of the monitoring target falls within a required range, and if not, whether it is too high or too low, by how much, etc.;

[0103] Make automatic adjustments based on monitoring characteristics and adjustment models;

[0104] Among them, according to the control strategy of the control path, the adjustment model of the monitoring target is determined, including:

[0105] Obtaining the control result of the control strategy; wherein the control result is: the impact result of the monitoring target after applying the control strategy;

[0106] Obtain control timing information of the control path; wherein the control timing information includes: which control is performed first and which control is performed next, for example: pH value control is performed first, then DO concentration control is performed, and finally temperature control is performed;

[0107] Based on the control results and control timing information, the interference path and interference factor are determined. The interference path is the communication link of the control center that affects the parameters of the control result. The interference factor is the type of change and the amount of change. For example, if the control result is a temperature increase of 2°C, the corresponding interference path is the control path of the DO parameter, and the interference factor is the impact on the current DO concentration, indicating how much it will decrease or reduce.

[0108] Obtaining a control strategy correction library for the interference path; wherein the control strategy correction library stores correction solutions for the control strategies of the interference path corresponding to different interference causes, for example, how to correct the current DO concentration control strategy in consideration of different situations where temperature control is later and needs to be adjusted;

[0109] Determine the correction control strategy based on the control strategy correction library of the interference path and the interference factor of the interference path;

[0110] Determine the adjustment model of monitoring targets according to the revised control strategy;

[0111] Among them, the control strategy correction library for obtaining the interference path includes:

[0112] Obtaining manual control records of the monitoring target; wherein the manual control records are: process records of manually controlling the data range of the monitoring target;

[0113] The manual conversation during the manual control recording process is expanded on a preset time axis to obtain multiple conversation items; wherein the conversation items are: the conversation semantics during the manual data range control process of the monitoring target;

[0114] The conversation item is matched with the preset standard revision semantic items. If a match is found, the corresponding conversation item is used as the target conversation item. The standard revision semantic items are semantics indicating policy revisions, such as "affecting previous results" or "needing readjustment". The standard revision semantic items are manually pre-entered.

[0115] Determine a first extractor of conversation items that are a preset first number of conversation items before the target conversation item on the timeline; wherein the preset first number of conversation items is, for example, 5, and the specific number can be set by the staff; the extractor is the person who extracts the conversation items;

[0116] determining whether the first extraction party is different from the second extraction party of the target dialogue item;

[0117] If there is a difference, obtain the conversation item of the second extracted party after the target conversation item and use it as the analysis item;

[0118] If there is no difference, the dialogue items that are a preset second number of dialogue items before and after the target dialogue item on the timeline are used as question semantic matching items, and a search is attempted for question semantic items in the question semantic matching items; wherein the preset second number of dialogue items is, for example, 20; and the question semantic item is a semantic item that expresses a question, such as "how did the error occur?", "how is it different?", etc.;

[0119] If the query semantic item search fails, the query semantic matching item is used as the analysis item; wherein, if the query semantic item search fails, it means that the second questioner's correction process is smooth and no questions arise;

[0120] If the query semantic item search is successful, the conversation item of the third party who spoke closest to the second party after the target conversation item is obtained as the analysis item. If the query semantic item search is successful, the conversation item of the third party who spoke immediately after the target conversation item is likely to be the answer to the question and needs to be analyzed in detail, so it is selected as the analysis item.

[0121] The analysis items are input into the semantic analysis model, and a control strategy correction library is constructed based on the analysis results. The semantic analysis model is an AI model that analyzes the meaning of multiple semantic representations.

[0122] The working principle and beneficial effects of the above technical solution are:

[0123] The present invention introduces the control path of the monitoring target, obtains the control strategy corresponding to the control path, integrates the control strategy, and determines the adjustment model of the monitoring target; introduces a monitoring feature extraction template to extract the monitoring features of the monitoring target, and performs automatic adjustment control based on the monitoring features and the adjustment model; in addition, considering the mutual influence after the application of the control strategies of different monitoring targets, when integrating the control strategies, the control results of the control strategy and the control timing information of the control path are introduced to determine the interference path and interference factor; introduces a control strategy correction library for the interference path, and determines the correction control strategy according to the interference factor; and determines the adjustment model of the monitoring target according to the corrected correction control strategy, thereby improving the suitability of the adjustment model construction;

[0124] When obtaining the control strategy correction library of the interference path, the manual control record of the data range control of the monitoring target is introduced, and the manual dialogue in the process is expanded on the timeline to obtain multiple dialogue items; the dialogue item is matched with the standard correction semantic item to determine the target dialogue item; the first extraction party of the dialogue item that is the number of the first dialogue item before the target dialogue item on the timeline is determined, and it is judged whether the first extraction party is different from the second extraction party of the target dialogue item. If there is a difference, it means that the second extraction party is in dialogue with the first extraction party immediately after the first extraction party, and the dialogue is urgent. The dialogue item of the second extraction party after the corresponding target dialogue item is very likely to be a correction strategy for a certain correction situation, so it is used as an analysis item; if there is no difference, it means that the number of the first dialogue item preset before the target dialogue item is different. The dialogue item is also extracted by the second extractor, and there is no "interruption". The dialogue items of the preset number of second dialogue items before and after the target dialogue item on the timeline are obtained as question semantic matching items, and it is judged whether there is any question when the second extractor operates on its own. If there is no question semantic item in the question semantic matching item, it means that the question semantic matching item near the corresponding target dialogue item is the semantic analyzed by the second extractor itself, so it is used as the analysis item; if there is a question, the semantic item of the third extractor who continues to speak after the second extractor finishes speaking is very likely to be the answer to the question, so it is used as the analysis item; a semantic analysis model is introduced to determine the analysis results, and the control strategy correction schemes under different control correction situations are summarized to obtain a control strategy correction library, thereby improving the construction efficiency of the control strategy correction library.

[0125] Among them, the monitoring and control system also performs the following operations:

[0126] Optimize the control range of monitoring targets; the control range of monitoring targets is: DO concentration is controlled at 0.5-1.5 mg / L, pH is controlled at 7.0-8.0, and temperature is controlled at 25-30°C;

[0127] The control scope of the optimized monitoring objectives includes:

[0128] Obtaining the biological growth status in the composite biological multiplication device; wherein the biological growth status refers to the growth status of microorganisms in the composite biological multiplication device, and determining and obtaining the corresponding detection method based on the type of microorganism;

[0129] Extracting biological growth characteristics based on a preset biological growth characteristic extraction template corresponding to the biological species; wherein the biological growth characteristic extraction template is a template for extracting growth characteristics of microorganisms in the composite biological multiplication device based on the microbial growth conditions, and the growth characteristics include: reproduction speed, activity, etc.;

[0130] An initial matrix is constructed based on the biological growth characteristics; wherein the construction rules of the initial matrix are manually set, specifically, the biological growth characteristic type corresponding to each column of the initial matrix and the microorganism numbering rules corresponding to each row are specified;

[0131] Obtaining ideal biological growth characteristics; wherein, ideal biological growth characteristics are: growth characteristics of microorganisms under ideal growth environment;

[0132] Construct a target matrix based on the ideal biological growth characteristics; the construction rules of the target matrix are the same as the initial matrix;

[0133] Determine a biological growth control model based on historical biological growth control records; historical biological growth control records are records of controlling microbial growth by changing the monitoring target range; and a biological growth control model is an AI model that describes how to change from one microbial growth state to another.

[0134] Based on the biological growth control model, the initial matrix is used as the model input and the target matrix is used as the model output to calculate the biological growth control parameters of the model; wherein the biological growth control parameters are: correction parameters of the control range;

[0135] The control range is adjusted according to the control parameters of the biological growth conditions to obtain the optimized control range of the monitoring target.

[0136] The working principle and beneficial effects of the above technical solution are:

[0137] The present invention obtains the biological growth conditions in a composite biological multiplication device, introduces a biological growth feature extraction template, determines the biological growth features, and constructs an initial matrix of the biological growth features; obtains ideal biological growth features and constructs a target matrix; inputs the initial matrix and the target matrix into a biological growth control model trained based on historical biological growth control records to obtain biological growth control parameters, thereby improving the output efficiency of the correction parameters of the control range; adjusts the control range according to the biological growth control parameters to obtain an optimized control range of the monitoring target, and makes the optimization process of the control range more reasonable.

[0138] Example 2

[0139] like Figure 5-6 As shown, a sludge screening device is provided at the lower end of the sedimentation tank, and the sludge screening device includes a shell 1, a sludge inlet pipe 2 is provided at the upper end of the shell 1, and the sludge inlet pipe 2 is connected to the sludge outlet at the lower end of the sedimentation tank, and a control valve is provided in the sludge inlet pipe 2;

[0140] A filter screen 8 is inserted into the housing 1, and the housing 1 is rotatably connected to a baffle 10. The front end of the baffle 10 abuts against the edge of the filter screen 8. A protrusion 9 is provided on the side of the filter screen 8. A first conical hopper 11 and a second conical hopper 12 are fixed in parallel at the lower end of the housing 1. The lower end of the first conical hopper 11 is connected to the composite composite biological multiplication device through a first discharge pipe 13, and the lower end of the second conical hopper 12 is connected to the PNA integrated micro-aerobic reactor through a second discharge pipe 14.

[0141] The housing 1 is provided with a guide plate 3, an impeller 4 is rotatably connected to the housing 1, a runner 5 is fixed to the end of the impeller 4, the runner 5 is fixedly connected to one end of a connecting rope 6, and a percussion hammer 7 is fixed to the other end of the connecting rope 6;

[0142] The working principle and beneficial effects of the above technical solution are as follows: granular sludge and flocculent sludge are deposited at the bottom of the sedimentation tank. When the control valve is opened, the granular sludge and flocculent sludge enter the shell 1 through the sludge inlet pipe 2, fall on the filter screen 8 and slide downward, and the water and flocculent sludge fall from the filter holes on the filter screen 8 into the first conical hopper 11, and then enter the composite bio-multiplication device through the first discharge pipe 13. The granular sludge cannot fall from the filter holes on the filter screen 8, and rolls from the lower end of the filter screen 8 into the second conical hopper 12, and then enters the PNA integrated micro-aerobic reactor through the second discharge pipe 14, thereby completing the separation of granular sludge and flocculent sludge, realizing the coupling of sludge selective separation function and bio-multiplication technology, and can continuously improve the proportion of composite nitrification anaerobic ammonia oxidation granular sludge in the micro-aerobic reactor, with fast startup and strong stability.

[0143] After the granular sludge and flocculent sludge enter the housing 1, they move downward under the guidance of the guide plate 3, driving the impeller 4 to rotate, driving the runner 5 to rotate, driving the connecting rope 6 and the knocking hammer 7 to move along with the runner 5, and the knocking hammer 7 knocks on the protrusion 9, driving the filter screen 8 to vibrate, shaking off the sludge attached to the filter screen 8, and preventing the sludge from blocking the filter holes on the filter screen 8;

[0144] The baffle 10 is rotated to separate the front end of the baffle 10 from the filter 8 , and the protrusion 9 is pulled outward to pull out the filter 8 , thereby facilitating the cleaning and replacement of the filter 8 .

[0145] Finally, it should be noted that the above-described embodiments merely represent several implementation methods of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made by a person skilled in the art without departing from the spirit of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention should be based on the appended claims.

Claims

1. A low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater, characterized in that: It includes a PNA integrated micro-aerobic reactor, a sludge screening device, and a composite functional bacteria multiplication device connected in sequence; The PNA integrated micro-aerobic reactor comprises a submersible stirring device, a sodium carbonate automatic dosing device, an immobilized biological activity stimulating carrier filler, a micro-aerobic aeration device, a sludge settling tank, and an online monitoring device; The immobilized bioactive stimulating carrier filler is a nZVI-polyethylene / activated carbon composite carrier, which uses high-density polyethylene as a skeleton, activated carbon and nano-zero-valent iron as functional materials, and is prepared by a high-temperature extrusion air cooling molding method; The sludge screening device separates the settled sludge, the flocculent sludge is transported to the composite functional bacteria multiplication device for enrichment and culture, and the granular sludge is returned to the PNA integrated micro-aerobic reactor; The composite functional bacteria multiplication device serves as a self-cultivation system for the functional bacteria of the PNA denitrification system, and the cultivated mature bacteria are regularly added to the PNA microaerobic reactor; The composite functional bacteria multiplication device includes an enrichment culture tank, a culture fluid feeding device, a concentration system, and a monitoring and control system; The monitoring and control system includes automatic monitoring and control of DO, pH and temperature; The monitoring and control system performs the following operations: Obtain the control path of the monitoring target; Obtaining the control strategy of the control path; Determine the adjustment model of the monitoring target according to the control strategy of the control path; Extract monitoring features based on a preset monitoring feature extraction template; Make automatic adjustments based on monitoring characteristics and adjustment models; Among them, according to the control strategy of the control path, the adjustment model of the monitoring target is determined, including: Obtain control results of control strategies; Obtain control timing information of the control path; Determine the interference path and interference factor based on the control results and control timing information; Obtain the control strategy correction library for interference paths; Determine the correction control strategy based on the control strategy correction library of the interference path and the interference factor of the interference path; Determine the adjustment model of monitoring targets according to the revised control strategy; Among them, the control strategy correction library for obtaining the interference path includes: Obtain manual control records of monitoring targets; Expanding the manual conversation during manual control recording on a preset time axis to obtain multiple conversation items; Match the dialogue item with the preset standard modified semantic item. If there is a match, use the corresponding dialogue item as the target dialogue item. Determine a first extraction party of dialogue items that are a preset first number of dialogue items before a target dialogue item on a time axis; determining whether the first extraction party is different from the second extraction party of the target dialogue item; If there is a difference, obtain the conversation item of the second extracted party after the target conversation item and use it as the analysis item; If there is no difference, taking the dialogue items of a preset second number of dialogue items before and after the target dialogue item on the timeline as question semantic matching items, and attempting to search for the question semantic item in the question semantic matching items; If the query semantic item search fails, the query semantic matching item is used as the analysis item; If the query semantic item search is successful, the conversation item of the third extraction party who spoke closest to the second extraction party after the target conversation item is obtained as the analysis item; The analysis items are input into the semantic analysis model, and a control strategy correction library is constructed based on the analysis results.

2. The low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater according to claim 1 is characterized in that: Submersible mixing device, used for uniform mixing of mud and water; Sodium carbonate automatic dosing device, used for automatic dosing of sodium carbonate solution to maintain the pH of the PNA system between 7.0 and 8.0; The micro-aeration device is installed in the middle of the immobilized biological activity stimulating carrier filler and is laterally spaced 0.2 to 0.5 m from the immobilized biological activity stimulating carrier filler; Sludge sedimentation tank, used for sedimentation and separation of mud-water mixture; Online monitoring devices include DO, ORP, and MLSS online monitors.

3. The low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater according to claim 1 is characterized in that: Part of the effluent from the PNA integrated micro-aerobic reactor is returned to the A / O combined pool anoxic pool, with a return ratio of 1:1 to 2:

1.

4. The low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater according to claim 1 is characterized in that: The sludge screening device is arranged at the lower end of the sedimentation tank, and the sludge screening device includes a shell, and a sludge inlet pipe is provided at the upper end of the shell. The sludge inlet pipe is connected to the sludge outlet at the lower end of the sedimentation tank, and a control valve is provided in the sludge inlet pipe; A filter is inserted into the shell, and the shell is rotatably connected to the baffle. The front end of the baffle is against the edge of the filter, and a protrusion is provided on the side of the filter. A first conical hopper and a second conical hopper are fixed in parallel at the lower end of the shell. The lower end of the first conical hopper is connected to the composite biological multiplication device through a first discharge pipe, and the lower end of the second conical hopper is connected to the PNA integrated micro-aerobic reactor through a second discharge pipe.

5. The low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater according to claim 1 is characterized in that: The composite functional bacteria multiplication device includes an enrichment culture tank, a culture fluid feeding device, a concentration system, and a monitoring and control system; The effective volume of the enrichment culture tank is 1 / 100 to 1 / 50 of the effective volume of the PNA integrated micro-aerobic reactor, and the inoculated sludge comes from the flocculent sludge screened by the PNA integrated micro-aerobic reactor; The effective volume of the culture fluid feeding device is 1 / 4 to 1 / 2 of the effective volume of the enrichment culture tank, and the culture fluid components include matrix solution, trace elements, inorganic salts, and industrial nitrogen-containing wastewater; The concentration system is used to concentrate the mature bacterial strains so that they can be regularly added to the PNA integrated microaerobic reactor later; The monitoring and control system includes automatic monitoring and control of DO, pH and temperature.

6. A low-carbon modular biological denitrification treatment system for industrial nitrogenous wastewater according to any one of claims 1 to 5, used for a low-carbon modular biological denitrification treatment method for industrial nitrogenous wastewater, characterized in that: The following steps are involved: S1. Low-carbon biological denitrification: The effluent after conventional pretreatment and anaerobic-A / O biological treatment is sent to the PNA integrated micro-aerobic reactor. The AOB bacteria on the surface of the short-range nitrification anaerobic ammonia oxidation granular sludge in the reactor preferentially perform short-range nitrification to convert ammonia nitrogen into NO2 - And consume oxygen, making the anaerobic ammonia oxidizing bacteria inside the system in an anaerobic state, and converting NH4 + NO2 produced by short-range nitrification - Converted into N2 and a small amount of NO3 - The sludge-water mixture in the reactor is settled in the sludge settling tank. The supernatant in the sludge settling tank is discharged after reaching the standard. At the same time, the supernatant is returned to the anoxic tank of the A / O combined tank to achieve further denitrification. The return ratio is 1:1 to 2:

1. S2. Sludge Screening: The sludge-water mixture generated during the operation of the PNA integrated micro-aerobic reactor is settled in a sludge settling tank. The settled sludge is separated by a sludge screening device. The flocculent sludge is transported to a composite functional bacteria multiplication device for enrichment and cultivation, and the granular sludge is returned to the PNA integrated micro-aerobic reactor. S3. Enrichment of composite functional bacteria: The composite functional bacteria multiplication device serves as the functional bacteria self-cultivation system of the PNA denitrification system, and the mature bacteria are regularly added to the PNA microaerobic reactor.

7. The low-carbon modular biological denitrification treatment method for industrial nitrogenous wastewater according to claim 6, characterized in that: In step S1, the influent COD concentration of the PNA integrated microaerobic reactor is 300-1000 mg / L, the TN concentration is 200-600 mg / L, and the organic nitrogen content is less than 10%; the sludge concentration is 8-10 g / L, the pH value is 7.0-8.0, the dissolved oxygen concentration is 0.5-1.5 mg / L, the reaction temperature is 20-35° C., and the hydraulic retention time is 1-4 days; The immobilized biological activity stimulation carrier filler in the PNA integrated micro-aerobic reactor is a nZVI-polyethylene / activated carbon composite carrier, and the addition ratio is 20% to 40%.

8. The low-carbon modular biological denitrification treatment method for industrial nitrogenous wastewater according to claim 6 is characterized in that In step S3, the DO concentration of the composite functional bacteria multiplication device is controlled at 0.5-1.5 mg / L, the pH is controlled at 7.0-8.0, and the temperature is controlled at 25-30°C; The particle size of the mature short-range nitrification anaerobic ammonium oxidation granular sludge of the composite functional bacteria multiplication device is 2 to 8 mm; The dosage of composite functional bacteria is 1‰ to 5‰ of the effective volume of the PNA microaerobic reactor, and it is added once every one to two months.

Images