An integrated autotrophic nitrogen removal device and method

Abstract

The present application relates to high ammonia nitrogen wastewater treatment technical field, especially in one kind of integrated autotrophic denitrification device and method, wherein, one kind of integrated autotrophic denitrification device includes: pretreatment component, short path nitrification component, anaerobic ammonia oxidation component, collection and sludge discharge component, process insulation component, identification monitoring component, identification and determination component;The identification and determination component is analyzed according to the real-time image of the anaerobic ammonia oxidation bacteria distribution obtained and issues corresponding adjustment signal, or, alarm signal, so that the operation parameters of the determining device each component are adjusted accordingly.The present application provides a kind of short path nitrification and anaerobic ammonia oxidation combination mode, realizes partial short path nitrification, solves the accumulation problem of anaerobic ammonia oxidation bacteria, provides anaerobic ammonia oxidation bacteria for short path nitrification system, improves denitrification efficiency, and the device is self-regulating, strengthens the stability of device operation, so that the device can be long-term and stable operation.

Description

Technical Field

[0001] This invention relates to the field of high ammonia nitrogen wastewater treatment technology, and in particular to an integrated autotrophic denitrification device and method. Background Technology

[0002] Short-cut nitrification anammox, compared to traditional nitrification / denitrification processes, saves energy and reduces the addition of additional organic matter. Currently, it is widely used, represented by partial nitrite / anammox (PN / A) and fully autotrophic denitrification processes (short-cut nitrification). However, because ANAMMOX bacteria are sensitive to environmental factors such as temperature, dissolved oxygen (DO), alkalinity, and organic matter, and have long generation times, the stability of autotrophic denitrification processes is relatively poor. Internationally, autotrophic denitrification processes have been applied in engineering projects for the treatment of high-ammonia-nitrogen, low-carbon-to-nitrogen ratio wastewater such as landfill leachate, aquaculture wastewater, and sludge digestate. In response to the future trend and requirements of reducing carbon emissions and achieving carbon peaking, energy conservation in the wastewater treatment sector is crucial.

[0003] The biggest challenge in the engineering application of anaerobic ammonia oxidation process lies in:

[0004] (1) Due to the long generation cycle of anaerobic ammonia oxidizing bacteria, it is a major challenge to quickly and continuously cultivate and enrich anaerobic ammonia oxidizing bacteria so that they can continuously generate benefits on a large scale.

[0005] (2) Since anaerobic ammonia oxidizing bacteria are autotrophic, the presence of organic matter in sewage will promote the proliferation of heterotrophic bacteria. The organic environment will inhibit the reproduction of anaerobic ammonia oxidizing bacteria, compress the living space of anaerobic ammonia oxidation, and make the anaerobic ammonia oxidation system deteriorate continuously and difficult to maintain.

[0006] (3) It is difficult to control stable short-cut nitrification.

[0007] Chinese Patent Publication No. CN114105299A discloses an apparatus and method for enhancing carbon source sludge capture combined with autotrophic and heterotrophic denitrification in urban sewage, belonging to the field of sewage treatment. Urban sewage first enters a carbon source capture reactor. During a short-term low-oxygen aeration process, colloidal and partially dissolved organic matter in the sewage is transferred to the sludge through biosorption. A portion of the carbon-rich sludge is discharged into a sludge storage tank. Then, high-oxygen aeration restores the microbial adsorption capacity. After sedimentation, the supernatant is regulated by an intermediate water tank before entering the autotrophic and heterotrophic denitrification reactor. The autotrophic and heterotrophic denitrification reactor operates in an aerobic-anoxic mode. Partial short-cut nitrification occurs in the low-dissolved-oxygen aerobic section, converting some ammonia nitrogen into nitrite. Then, anoxic stirring is performed, and ammonia nitrogen and nitrite are removed through anaerobic ammonia oxidation. Simultaneously, volatile fatty acids produced by in-situ sludge fermentation reduce the remaining nitrite and generated nitrate into nitrogen gas.

[0008] Current denitrification devices have low denitrification efficiency and have not solved the problem of anaerobic ammonia oxidizing bacteria accumulation, nor have they provided anaerobic ammonia oxidizing bacteria for short-cut nitrification systems. Summary of the Invention

[0009] Therefore, the purpose of this invention is to provide an integrated autotrophic denitrification device and method to overcome the problems of low denitrification efficiency of current denitrification devices, failure to address the accumulation of anaerobic ammonia oxidizing bacteria, and failure to provide anaerobic ammonia oxidizing bacteria for short-cut nitrification systems.

[0010] To achieve the above objectives, the present invention provides an integrated autotrophic denitrification device, comprising,

[0011] Pretreatment components are used to pretreat wastewater in advance;

[0012] A short-cut nitrification unit for primary treatment of the wastewater;

[0013] Anaerobic ammonia oxidation unit, used for secondary treatment of the wastewater after the primary treatment;

[0014] A sludge collection and discharge assembly is used to discharge the sludge that has not been separated after the secondary treatment, and to collect and discharge the obtained reclaimed water.

[0015] A process isolation component is used to separate suspended solids and solid particles from the pretreated wastewater;

[0016] The identification and monitoring components include an image acquisition unit and a timing module;

[0017] The image acquisition device is installed inside the anaerobic ammonia oxidation component to monitor the reaction state inside the anaerobic ammonia oxidation component in real time.

[0018] The timing module is used to time the attachment and biofilm formation time of anaerobic ammonia-oxidizing bacteria;

[0019] The components to be identified include the blower, aeration head, central control analysis module, and adjustment module;

[0020] The blower is used to control the concentration of dissolved oxygen in the volcanic rock biofilter.

[0021] The aeration head is used to generate sufficient mixing in the aeration zone and to allow the wastewater to circulate.

[0022] The central control analysis module is connected to the identification and monitoring component, the fan and the aeration head respectively. The image acquisition device is used to acquire real-time images of the distribution of anaerobic ammonia oxidizing bacteria. The central control analysis module analyzes the real-time images and issues corresponding adjustment signals or alarm signals.

[0023] The adjustment module is used to make corresponding adjustments based on various adjustment signals issued by the central control analysis module, and to determine the number of air holes opened by the aeration head, the placement position of the aeration head in the aeration zone, and the actual rotation speed of the blower.

[0024] Furthermore, the pretreatment assembly includes an adsorption sedimentation tank, an influent pump, and a pretreatment baffle.

[0025] The adsorption sedimentation tank is a pretreatment reaction tank used to adsorb and consume organic matter in wastewater in advance;

[0026] The inlet pump is used to draw the wastewater after it has been adsorbed and consumed in the adsorption sedimentation tank into the reaction chamber of the device.

[0027] The pretreatment baffle is used to pretreatment and separate suspended solids and solid particles in the wastewater drawn into the reaction chamber of the device;

[0028] The device reaction chamber is divided into different reaction chambers according to the different types of wastewater reactions, including: a first reaction chamber and a second reaction chamber;

[0029] The short-range nitrification assembly includes a first reaction chamber, a biofilm structure, and a fixed water distributor.

[0030] The first reaction chamber is used to provide a reaction site for short-cut nitrification of wastewater;

[0031] The fixed water distributor is used to distribute the water flow evenly;

[0032] The biofilm structure is used to adsorb and decompose pollutants in the wastewater in suspended, colloidal, and dissolved states;

[0033] The packing material in the first reaction chamber is made of polyethylene.

[0034] Furthermore, the anaerobic ammonia oxidation component includes the second reaction chamber and a volcanic rock biofilter;

[0035] The second reaction chamber is used to provide a reaction site for the anaerobic ammonia oxidation reaction of wastewater;

[0036] The volcanic rock biofilter is used to intercept anaerobic ammonia oxidizing bacteria, reduce the loss of anaerobic ammonia oxidizing bacteria, provide an anaerobic environment for the attachment and growth of anaerobic ammonia oxidizing bacteria, and play a role in filtration and adsorption.

[0037] The packing material in the volcanic rock biofilter is volcanic rock;

[0038] The sludge collection and discharge assembly includes a sedimentation tank, a sludge discharge pump, and an outlet pipe.

[0039] The sedimentation tank is used to collect wastewater treated by the short-cut nitrification unit and the anaerobic ammonia oxidation unit;

[0040] The sludge pump is used to discharge unseparated sludge;

[0041] The outlet pipe is used to discharge and collect the treated reclaimed water;

[0042] The process isolation component includes: a first partition, a second partition, and a pebble layer;

[0043] The first baffle is used to separate suspended solids and solid particles in the wastewater after short-cut nitrification treatment;

[0044] The second baffle is used to separate suspended solids and solid particles from the wastewater after anaerobic ammonia oxidation treatment;

[0045] The pebble layer is used for preliminary filtration of larger suspended solids and particles in the wastewater.

[0046] Furthermore, the central control analysis module is equipped with a monitoring cycle, standard dispersion, and dispersion evaluation value;

[0047] The image acquisition device acquires real-time initial images of the red biofilm in the second reaction chamber at different monitoring times according to the monitoring cycle;

[0048] The central control analysis module can determine the initial dispersion of the anaerobic ammonia oxidizing bacteria based on the real-time initial image, and determine whether the attachment and biofilm formation of the anaerobic ammonia oxidizing bacteria meets the requirements based on the absolute value of the first difference combined with the dispersion evaluation value.

[0049] Wherein, the absolute value of the first difference is the absolute value of the difference between the initial dispersion and the standard dispersion.

[0050] Furthermore, if the anaerobic ammonia-oxidizing bacteria's attachment and biofilm formation does not meet the requirements, the central control analysis module can determine whether to issue a first adjustment signal or a second adjustment signal based on the relationship between the initial dispersion and the standard dispersion.

[0051] The adjustment module can determine the number of air holes to be opened by the aeration head according to the first adjustment signal, and can determine the placement position of the aeration head in the aeration zone according to the second adjustment signal.

[0052] Furthermore, based on determining the number of open vents or the placement position of the aeration head, the timing module is activated;

[0053] The image acquisition device acquires a first actual image of the second reaction chamber when the monitoring cycle is reached according to the timing module.

[0054] The central control analysis module can determine the actual dispersion of the anaerobic ammonia oxidizing bacteria based on the first actual image, and determine the first rotational speed of the fan based on the absolute value of the second difference combined with the dispersion evaluation value;

[0055] Wherein, the absolute value of the second difference is the absolute value of the difference between the actual dispersion and the standard dispersion.

[0056] Furthermore, the central control analysis module can obtain the real-time distribution area of ​​the anaerobic ammonia oxidizing bacteria at each monitoring time based on the image acquisition device and the monitoring cycle, and can calculate the rate of change of the distribution area in each monitoring cycle based on the real-time distribution area at adjacent monitoring times.

[0057] The central control analysis module can determine the blockage status of the first partition based on the rate of change of the distribution area and the maximum rate evaluation value set therein.

[0058] Furthermore, the central control analysis module is equipped with a baffle blockage evaluation interval, wherein the minimum rate evaluation value and the maximum rate evaluation value are the boundary values ​​of the baffle blockage evaluation interval, respectively.

[0059] The central control analysis module can determine the blockage level of the first baffle based on the rate of change of the distribution area and the baffle blockage evaluation value, and determine the second speed of the fan for different blockage levels, or replace the first baffle.

[0060] Furthermore, the central control analysis module can generate a rate change curve based on the acquired rate of change of each distribution area, and determine the actual fluctuation amplitude based on the rate change curve.

[0061] The central control analysis module can determine whether the operating status of the integrated autotrophic denitrification device is good or poor based on the absolute value of the third difference and its set operating stability evaluation value.

[0062] The third difference absolute value is the absolute value of the difference between the actual fluctuation amplitude value and the standard fluctuation amplitude value set by the central control analysis module.

[0063] This invention also provides an integrated autotrophic nitrogen removal method, comprising,

[0064] Step S1 involves pretreating the wastewater to adsorb and consume the organic matter in the wastewater.

[0065] Step S2: The pretreated wastewater is processed sequentially through a short-cut nitrification section and an anaerobic ammonia oxidation section. The aeration head drives the water flow to mix and introduce some anaerobic ammonia oxidizing bacteria into the short-cut nitrification section to form a biofilm with AOB bacteria.

[0066] Step S3: Obtain a real-time image of the distribution of anaerobic ammonia oxidizing bacteria in the second reaction chamber, thereby determining the number of air holes opened by the aeration head, the placement position of the aeration head in the aeration zone, and the actual rotation speed of the blower.

[0067] In step S4, the device operates with defined operating parameters to achieve high-efficiency nitrogen removal.

[0068] Compared with the prior art, the beneficial effects of the present invention are that, by providing a method that combines partial short-cut nitrification with anaerobic ammonium oxidation, the present invention achieves partial short-cut nitrification while solving the problem of anaerobic ammonium oxidation bacteria accumulation, and at the same time provides anaerobic ammonium oxidation bacteria for the short-cut nitrification system, thereby improving nitrogen removal efficiency.

[0069] 1. This device uses fixed biofilm short-cut nitrification to solve the problems of aerobic environment and long generation time of AOB bacteria, and biological filter anaerobic ammonia oxidation to solve the problem of long generation cycle of anaerobic ammonia oxidizing bacteria, which can effectively accumulate over a long period of time;

[0070] 2. The use of integrated equipment reduces the number of pipeline connections between equipment and the installation of power units, thereby reducing energy consumption;

[0071] 3. By coexisting the anaerobic ammonia oxidation section and the short-cut nitrification section in one reactor, an anaerobic and anoxic environment is created, realizing integrated autotrophic nitrogen removal, reducing oxygen demand, and reducing aeration consumption.

[0072] 4. Because short-cut nitrification and anaerobic ammonium oxidation are located in the same device, some anaerobic ammonium oxidation bacteria can continuously attach and grow in the short-cut nitrification biofilm, increasing the nitrogen removal efficiency.

[0073] 5. This reactor equipment has a simple structure, small footprint, low investment cost, simple operation and maintenance cost, low cost, and low energy consumption.

[0074] In particular, by adding volcanic rock packing to the second reaction chamber, the loss of anaerobic ammonia oxidation bacteria is avoided, and the proliferation of anaerobic ammonia oxidation sludge is completed. Furthermore, by adding pretreatment components, organic matter is adsorbed and consumed in advance. By utilizing the differences in characteristics between AOB and NOB bacteria, parameters such as dissolved oxygen concentration, pH value, alkalinity, FA concentration, temperature, and HRT are controlled for screening, so as to retain AOB bacteria and inhibit NOB bacteria, thereby achieving stable short-cut nitrification.

[0075] In particular, the image acquisition device monitors the attachment and biofilm formation of anaerobic ammonia oxidizing bacteria in each reaction area in real time according to the set monitoring cycle. The central control analysis module determines the initial dispersion of anaerobic ammonia oxidizing bacteria in each reaction area based on the acquired real-time initial images. Based on the initial dispersion and its set standard dispersion, it determines whether the attachment and biofilm formation of anaerobic ammonia oxidizing bacteria meets the requirements. For cases that do not meet the requirements, different adjustment signals are issued. The adjustment module makes corresponding adjustments according to the different adjustment signals, avoiding low denitrification efficiency caused by uneven distribution of anaerobic ammonia oxidizing bacteria. The uneven distribution of anaerobic ammonia oxidizing bacteria can be detected and adjusted in time, so that the short-cut nitrification section also has a stable denitrification function.

[0076] In particular, the adjustment module receives various adjustment signals from the central control and analysis module and makes corresponding adjustments. The image acquisition device acquires the first actual image after adjustment. The central control and analysis module determines the actual dispersion of anaerobic ammonia oxidizing bacteria based on the first actual image and judges whether the attachment and biofilm status of anaerobic ammonia oxidizing bacteria after adjustment meets the requirements. If it still does not meet the requirements, it is determined that the dissolved oxygen concentration does not meet the concentration requirements for retaining AOB bacteria and inhibiting NOB bacteria, resulting in the number of AOB bacteria not being sufficient to form a biofilm for coexistence with anaerobic ammonia oxidizing bacteria, resulting in low denitrification efficiency. By monitoring the red biofilm formed after adjustment in real time, it can be promptly discovered whether the number of pores opened by the aeration head and the placement angle of the aeration head can meet the requirements for the short-cut nitrification section to have denitrification function, thereby improving the operating efficiency and stability of the device.

[0077] In particular, by combining the rate of change of the distribution area acquired in different monitoring cycles with the baffle blockage evaluation interval set by the central control analysis module, it is determined whether the first baffle is blocked and the blockage level of the first baffle when it is blocked. The pressure applied to the anaerobic ammonia oxidizing bacteria is adjusted according to the different blockage levels, so as to achieve the purpose of automatically adjusting the stacking on the first baffle during the reaction process. On the one hand, it greatly accelerates the autonomous control of the device and enhances the stability of the device operation. On the other hand, through autonomous control, it improves the stacking on the first baffle caused by the generated deposit products, avoids the anaerobic ammonia oxidizing bacteria being unable to enter the first reaction chamber due to the stacking on the first baffle, or issues the first alarm signal according to the different blockage levels, so as to replace the first baffle in time, enabling the device to operate stably for a long time.

[0078] In particular, by organizing and summarizing the data obtained at each monitoring time, a rate change curve is generated. Based on the actual fluctuation amplitude determined by the rate change curve, the operational stability of the integrated autotrophic denitrification device can be accurately judged, thereby increasing the operational safety of the device. Attached Figure Description

[0079] Figure 1A schematic diagram of an integrated autotrophic denitrification device according to an embodiment of the invention;

[0080] Figure 2 This is a schematic diagram of the identification and determination component in an integrated autotrophic denitrification device according to an embodiment of the invention.

[0081] Figure 3 This is a schematic diagram of the pretreatment component and short-cut nitrification component in an integrated autotrophic denitrification device according to an embodiment of the invention.

[0082] Figure 4 A flowchart illustrating an integrated autotrophic denitrification method according to an embodiment of the invention;

[0083] The diagram includes: adsorption sedimentation tank 0, inlet pump 1, blower 2, fixed water distributor 3, pretreatment baffle 4, first reaction chamber 5, pebble layer 6, aeration head 7, second reaction chamber 8, sedimentation tank 9, sludge pump 10, outlet pipe 11, first baffle 12, and second baffle 13. Detailed Implementation

[0084] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0085] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0086] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0087] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0088] Please see Figures 1-4 As shown, Figure 1A schematic diagram of an integrated autotrophic denitrification device according to an embodiment of the invention; Figure 2 This is a schematic diagram of the identification and determination component in an integrated autotrophic denitrification device according to an embodiment of the invention. Figure 3 This is a schematic diagram of the pretreatment component and short-cut nitrification component in an integrated autotrophic denitrification device according to an embodiment of the invention. Figure 4 This is a flowchart illustrating an integrated autotrophic denitrification method according to an embodiment of the invention.

[0089] This invention provides an integrated autotrophic nitrogen removal device, comprising,

[0090] The pretreatment assembly includes an adsorption sedimentation tank 0, an influent pump 1, and a pretreatment baffle 4.

[0091] The adsorption sedimentation tank 0 is a pretreatment reaction tank used to adsorb and consume organic matter in wastewater in advance;

[0092] The inlet pump 1 is used to draw the wastewater after it has been adsorbed and consumed by the adsorption sedimentation tank 0 into the reaction chamber of the device.

[0093] The pretreatment baffle 4 is used to pretreatment and separate suspended solids and solid particles in the wastewater drawn into the reaction chamber of the device;

[0094] The device reaction chamber is divided into different reaction chambers according to the different types of wastewater reactions, including: a first reaction chamber 5 and a second reaction chamber 8;

[0095] The short-range nitrification assembly includes the first reaction chamber 5, a biofilm structure, and a fixed water distributor.

[0096] The first reaction chamber 5 is used to provide a reaction site for short-cut nitrification of wastewater;

[0097] The fixed water distributor is used to distribute the water flow evenly, so that the wastewater enters the treatment system in a uniform and stable manner, and to prevent large fluctuations in the influent, which would affect the effect of microbial treatment.

[0098] The biofilm structure is used to adsorb and decompose pollutants in the wastewater in suspended, colloidal, and dissolved states;

[0099] The packing material in the first reaction chamber 5 is made of polyethylene to increase the specific surface area of ​​the biofilm.

[0100] The anaerobic ammonia oxidation component includes the second reaction chamber 8 and a volcanic rock biofilter;

[0101] The second reaction chamber 8 is used to provide a reaction site for the anaerobic ammonia oxidation reaction of wastewater;

[0102] The volcanic rock biofilter is used to intercept anaerobic ammonia oxidizing bacteria, reduce the loss of anaerobic ammonia oxidizing bacteria, provide an anaerobic environment for the attachment and growth of anaerobic ammonia oxidizing bacteria, and play a role in filtration and adsorption.

[0103] The packing material in the volcanic rock biological filter is volcanic rock. The volcanic rock particles have a small diameter, which can intercept the anaerobic ammonia oxidizing bacteria, thereby reducing the loss of anaerobic ammonia oxidizing bacteria.

[0104] The sludge collection and discharge assembly includes a sedimentation tank 9, a sludge discharge pump 10, and an outlet pipe 11.

[0105] The sedimentation tank 9 is used to collect wastewater treated by the short-cut nitrification unit and the anaerobic ammonia oxidation unit;

[0106] The sludge pump 10 is used to discharge the unseparated sludge;

[0107] The outlet pipe 11 is used to discharge and collect the treated reclaimed water;

[0108] The water outlet pipe 11 uses the principle of communicating vessels to discharge water, which can achieve the effect of three-stage sedimentation and ensure the quality of the discharged water.

[0109] Process isolation components are used to separate suspended solids and particles from pretreated wastewater, thereby improving water quality;

[0110] The process isolation components include: a first partition 12, a second partition 13, and a pebble layer 6;

[0111] The first baffle 12 is used to separate suspended solids and solid particles in the wastewater after short-cut nitrification treatment;

[0112] The second baffle 13 is used to separate suspended solids and solid particles from the wastewater after anaerobic ammonia oxidation treatment;

[0113] The pebble layer 6 is used for preliminary filtration of larger suspended solids and solid particles in the wastewater;

[0114] The identification and monitoring components include an image acquisition unit and a timing module;

[0115] The image acquisition device is installed inside the second reaction chamber to monitor the reaction status inside the second reaction chamber in real time;

[0116] The timing module is used to time the attachment and biofilm formation time of anaerobic ammonia-oxidizing bacteria;

[0117] The components to be identified include blower 2, aeration head 7, central control analysis module, and adjustment module;

[0118] The blower 2 is used to control the concentration of dissolved oxygen in the volcanic rock biofilter.

[0119] The aeration head 7 is used to generate sufficient mixing in the aeration zone and to allow the wastewater to circulate.

[0120] The aeration head 7 is provided with a number of air holes. The placement position of the aeration head 7 in the aeration zone is adjustable and the closing state of each air hole is adjustable.

[0121] The central control analysis module is connected to the identification and monitoring component, the fan 2, and the aeration head 7 respectively. The image acquisition device is used to acquire real-time images of the distribution of anaerobic ammonia-oxidizing bacteria. The central control analysis module analyzes the real-time images and issues corresponding adjustment signals or alarm signals.

[0122] The adjustment module is used to make corresponding adjustments according to various adjustment signals issued by the central control analysis module, and to determine the number of air holes opened by the aeration head 7, the placement position of the aeration head 7 in the aeration zone, and the actual rotation speed of the blower 2.

[0123] This invention provides a method combining partial short-cut nitrification and anaerobic ammonium oxidation, achieving partial short-cut nitrification while simultaneously addressing the accumulation problem of anaerobic ammonium oxidizing bacteria. At the same time, it provides anaerobic ammonium oxidizing bacteria to the short-cut nitrification system, thereby improving nitrogen removal efficiency.

[0124] 1. This device uses fixed biofilm short-cut nitrification to solve the problems of aerobic environment and long generation time of AOB bacteria, and biological filter anaerobic ammonia oxidation to solve the problem of long generation cycle of anaerobic ammonia oxidizing bacteria, which can effectively accumulate over a long period of time;

[0125] 2. The use of integrated equipment reduces the number of pipeline connections between equipment and the installation of power units, thereby reducing energy consumption;

[0126] 3. By coexisting the anaerobic ammonia oxidation section and the short-cut nitrification section in one reactor, an anaerobic and anoxic environment is created, realizing integrated autotrophic nitrogen removal, reducing oxygen demand, and reducing aeration consumption.

[0127] 4. Because short-cut nitrification and anaerobic ammonium oxidation are located in the same device, some anaerobic ammonium oxidation bacteria can continuously attach and grow in the short-cut nitrification biofilm, increasing the nitrogen removal efficiency.

[0128] 5. This reactor equipment has a simple structure, small footprint, low investment cost, simple operation and maintenance cost, low cost, and low energy consumption.

[0129] Specifically, the integrated autotrophic denitrification device described in this embodiment is a cylindrical device, which is divided into three parts: upper, middle, and lower.

[0130] The upper part is the first reaction chamber 5. The first reaction chamber 5 adopts the biofilm structure and the packing is a short-cut nitrification system with polyethylene packing. The short-cut nitrification system uses the pretreatment partition 4 and the first partition 12 for interception. A 10cm thick pebble layer 6 is added on the first partition 12 to intercept sludge.

[0131] The middle part is the second reaction chamber 8. The second reaction chamber 8 adopts a biological filter anaerobic ammonia oxidation system. The packing material is the volcanic rock. The small particles of volcanic rock can effectively intercept the anaerobic ammonia oxidizing bacteria, reduce the loss of anaerobic ammonia oxidizing bacteria, and provide them with an anaerobic environment for attachment, growth and filtration. The biological filter anaerobic ammonia oxidation system uses the first partition 12 and the second partition 13 for interception.

[0132] The lower part is the sedimentation tank 9. After some unseparated sludge enters the sedimentation tank 9, it needs to be discharged regularly. A pipe extends out of the integrated self-nutritive denitrification device and the reclaimed water is discharged using the principle of communicating vessels, which can achieve the effect of secondary sludge settling and ensure the quality of the effluent.

[0133] Specifically, the startup process of the integrated autotrophic denitrification device described in this embodiment includes:

[0134] 1) The upper part of the integrated autotrophic denitrification device is inoculated with activated sludge, and polyethylene packing is added to the first reaction chamber 5. The dissolved oxygen concentration is controlled between 0.5 mg / L and 1.0 mg / L according to different continuous aeration methods, thereby starting the short-cut nitrification system. Biofilm formation occurs on the packing in the short-cut nitrification system. If the activated sludge decreases during the biofilm formation process, activated sludge can be inoculated and replenished until biofilm formation is successful. By using the biofilm structure, bacteria with longer sludge age can be retained in the polyethylene packing. In this embodiment, the bacteria with longer sludge age are AOB bacteria, and NOB bacteria are inhibited by controlling the dissolved oxygen concentration. After partial short-cut nitrification is achieved, an environment in which ammonia nitrogen and nitrite nitrogen coexist can be formed in the integrated autotrophic denitrification device.

[0135] 2) The anaerobic ammonia oxidizing bacteria are inoculated in the middle part of the integrated autotrophic denitrification device, and the volcanic rock packing is added to the second reaction chamber 8. The volcanic rock packing can intercept the anaerobic ammonia oxidizing bacteria, allowing them to attach and grow. At the same time, the volcanic rock packing has an adsorption effect, which can adsorb a portion of the ammonia nitrogen and the nitrite nitrogen. After short-cut nitrification is achieved in the first reaction chamber 5, it enters the anaerobic ammonia oxidation section to provide nutrients for the proliferation of anaerobic ammonia oxidizing bacteria. Meanwhile, in the integrated autotrophic denitrification device, water mixing will carry some anaerobic ammonia oxidizing bacteria into the short-cut nitrification section in the first reaction chamber 5.

[0136] 3) As the integrated autotrophic denitrification device operates, some of the anaerobic ammonia oxidizing bacteria will begin to attach to the polyethylene packing material in the short-cut nitrification section within the first reaction chamber 5, forming a biofilm where AOB bacteria and anaerobic ammonia oxidizing bacteria coexist. When the biofilm turns red, it indicates that the anaerobic ammonia oxidizing bacteria have successfully attached and formed a biofilm, signifying that the short-cut nitrification section also possesses denitrification capabilities.

[0137] During the process of anaerobic ammonia-oxidizing bacteria attaching and forming a biofilm, the concentration of dissolved oxygen is controlled at 1.0 mg / L.

[0138] Specifically, the integrated autotrophic nitrogen removal device described in this embodiment is installed in a top-to-bottom order, including:

[0139] Step 1: Install the second partition 13 on the reserved fixing bracket, and install a 20cm layer of pebbles with a particle size of 2-5cm on the second partition 13;

[0140] Step 2: Add volcanic rock packing material to the second reaction chamber 8, and inoculate the second reaction chamber 8 with anaerobic ammonia-oxidizing bacteria;

[0141] Step 3: Install aeration head 7 between the first reaction chamber 5 and the second reaction chamber 8, and connect the blower 2 to the aeration head 7 through a pipe;

[0142] Step 4: Install the first partition 12 between the first reaction chamber 5 and the aeration head 7, and install the pebble layer 6 on the first partition 12;

[0143] Step 5: Fill the first reaction chamber 5 with polyethylene filler and install the pretreatment partition 4 on the top of the first reaction chamber 5;

[0144] Step 6: Install the fixed water distributor 3 on the pretreatment partition 4, and connect the fixed water distributor 3 to the water inlet pump 1 with a pipe.

[0145] Step 7: The inlet pump 1 is connected to the adsorption sedimentation tank 0 through a pipeline. The inlet pump 1 draws the wastewater in the adsorption sedimentation tank 0 into the reaction chamber of the device.

[0146] Step 8: The adsorption sedimentation tank 0 is set on one side of the reaction chamber of the device to pretreat the wastewater and adsorb some of the organic matter and suspended solids in the wastewater.

[0147] In this embodiment of the invention, volcanic rock packing is added to the second reaction chamber 8 to prevent the loss of anaerobic ammonia oxidation bacteria, thereby achieving the proliferation of anaerobic ammonia oxidation sludge. Furthermore, a pretreatment component is added to adsorb and consume organic matter in advance. By utilizing the differences in characteristics between AOB and NOB bacteria, parameters such as dissolved oxygen concentration, pH value, alkalinity, FA concentration, temperature, and HRT are controlled for screening, so as to retain AOB bacteria and inhibit NOB bacteria, thereby achieving stable short-cut nitrification.

[0148] Specifically, in this embodiment, the first reaction chamber 5 is divided into three regions: a first reaction region, a second reaction region, and a third reaction region. The central control and analysis module is configured with a monitoring period T. The image acquisition device acquires real-time initial images of the red biofilm in each reaction region at different monitoring times according to the monitoring period T. The central control and analysis module determines the initial dispersion Di of each reaction region based on the acquired real-time initial images, where i = 1, 2, 3. The central control and analysis module also sets the standard dispersion D' of the red biofilm within each reaction region.

[0149] For the i-th reaction region, the central control analysis module calculates the absolute value of the first difference, D1”, based on the initial dispersion Di and the standard dispersion D'. D1” = |Di - D'|.

[0150] If D1"≤D0", then the central control analysis module determines that the anaerobic ammonia oxidizing bacteria in the i-th reaction area have met the requirements for attachment and biofilm formation.

[0151] If D1" > D0", then the central control analysis module determines that the anaerobic ammonia oxidizing bacteria in the i-th reaction area do not meet the requirements for attachment and biofilm formation.

[0152] Wherein, "D0" is the dispersion evaluation value set within the central control analysis module.

[0153] Specifically, in this embodiment, when D” > D0”,

[0154] If Di > D', it is determined that the anaerobic ammonia-oxidizing bacteria brought in by the water mixture are excessive, and the central control analysis module issues a first adjustment signal;

[0155] If Di < D', it is determined that the placement of the aeration head 7 in the aeration zone is inappropriate, and the central control analysis module sends a second adjustment signal.

[0156] The adjustment module adjusts the number of air holes opened by the aeration head 7 according to the first adjustment signal;

[0157] The adjustment module adjusts the placement angle of the aeration head 7 according to the second adjustment signal.

[0158] In this embodiment of the invention, an image acquisition device monitors the attachment and biofilm formation of anaerobic ammonia oxidizing bacteria in each reaction area in real time according to a set monitoring cycle. The central control and analysis module determines the initial dispersion of anaerobic ammonia oxidizing bacteria in each reaction area based on the acquired real-time initial images. Based on the initial dispersion and its set standard dispersion, it determines whether the attachment and biofilm formation of anaerobic ammonia oxidizing bacteria meets the requirements. For cases that do not meet the requirements, different adjustment signals are issued, and the adjustment module makes corresponding adjustments according to the different adjustment signals. This avoids low denitrification efficiency caused by uneven distribution of anaerobic ammonia oxidizing bacteria. Uneven distribution of anaerobic ammonia oxidizing bacteria can be detected and adjusted in a timely manner, so that the short-cut nitrification section also has a stable denitrification function.

[0159] Specifically, in this embodiment, after the adjustment module adjusts according to the first adjustment signal or the second adjustment signal, the timing module starts timing. When the timing duration reaches the monitoring period T, the image acquisition device acquires the first actual image after adjustment. The central control analysis module determines the actual dispersion D1i of the reaction area based on the first actual image, and calculates the second absolute value of the difference D2” based on the actual dispersion D1i and the standard dispersion D'. D2”=|D1i-D'|.

[0160] If D2"≤D0", then the central control analysis module determines that the anaerobic ammonia oxidizing bacteria attachment and biofilm formation status in the i-th reaction area after adjustment meets the requirements;

[0161] If D2”>D0”, the central control analysis module determines that the anaerobic ammonia oxidizing bacteria attachment and biofilm formation in the i-th reaction area after adjustment does not meet the requirements, and issues a third adjustment signal;

[0162] The adjustment module adjusts the speed of the fan 2 according to the third adjustment signal to determine the first speed of the fan 2.

[0163] In this embodiment of the invention, the adjustment module receives various adjustment signals from the central control and analysis module and performs corresponding adjustments. The image acquisition device acquires the first actual image after adjustment. The central control and analysis module determines the actual dispersion of anaerobic ammonia oxidizing bacteria based on the first actual image and judges whether the attachment and biofilm state of anaerobic ammonia oxidizing bacteria after adjustment meets the requirements. If it still does not meet the requirements, it is determined that the dissolved oxygen concentration does not meet the concentration requirements for retaining AOB bacteria and inhibiting NOB bacteria, resulting in the number of AOB bacteria not being sufficient to form a biofilm for coexistence with anaerobic ammonia oxidizing bacteria, resulting in low denitrification efficiency. By real-time monitoring of the red biofilm formed after adjustment, it is timely possible to detect whether adjusting the number of pores opened by the aeration head 7 and the placement angle of the aeration head 7 can meet the requirements for the short-cut nitrification section to have denitrification function, thereby improving the operating efficiency and stability of the device.

[0164] Specifically, in this embodiment, after each monitoring cycle T, the central control analysis module determines the real-time distribution area of ​​the anaerobic ammonia-oxidizing bacteria at that monitoring moment based on the real-time images acquired by the image acquisition device, and calculates the distribution area change rate V for each monitoring cycle based on the real-time distribution area at each adjacent monitoring moment.

[0165] If V≥V0max, then it is determined that the first partition 12 is not blocked;

[0166] If V < V0max, then the first partition 12 is determined to be blocked;

[0167] The central control analysis module includes a baffle blockage evaluation interval S, where S = [V0min, V0max].

[0168] V0min is the minimum rate evaluation value of the partition blockage evaluation interval S, and V0max is the maximum rate evaluation value of the partition blockage evaluation interval S.

[0169] Specifically, in this embodiment, when V < V0max, the central control analysis module determines the blockage level of the first baffle 12 based on the minimum rate evaluation value V0min.

[0170] If V0min < V < V0max, the blockage level of the first baffle 12 is determined to be level one. The central control analysis module sends a fourth adjustment signal, and the adjustment module adjusts the speed of the fan 2 according to the fourth adjustment signal to determine the second speed of the fan 2.

[0171] If V≤V0min, the blockage level of the first partition 12 is determined to be level two, and the central control analysis module issues a first alarm signal to replace the first partition 12.

[0172] This invention determines whether the first partition 12 is blocked and the blockage level of the first partition 12 when it is blocked by combining the rate of change of the distribution area during different monitoring periods with the partition blockage evaluation interval set by the central control analysis module. The pressure applied to the anaerobic ammonia oxidizing bacteria is adjusted according to the different blockage levels, so as to achieve the purpose of automatically adjusting the stacking on the first partition 12 during the reaction process. On the one hand, it greatly accelerates the autonomous control of the device and enhances the stability of the device operation. On the other hand, through autonomous control, it improves the stacking on the first partition 12 caused by the generated deposit products, avoids the anaerobic ammonia oxidizing bacteria being unable to enter the first reaction chamber 5 due to the stacking on the first partition 12, or issues a first alarm signal according to the different blockage levels, so as to replace the first partition 12 in time, so that the device can operate stably for a long time.

[0173] Specifically, in this embodiment, the central control analysis module generates a rate change curve based on the obtained rate of change of each distribution area, and determines the operational stability of the integrated autotrophic denitrification device based on the actual fluctuation amplitude F of the rate change curve.

[0174] The central control analysis module calculates the absolute value of the third difference, S3, based on the actual fluctuation amplitude F and the internally set standard fluctuation amplitude F0, where S3 = |F - F0|.

[0175] If S3≤S30, then the central control analysis module determines that the integrated autotrophic denitrification device has good operational stability;

[0176] If S3 > S30, the central control analysis module determines that the operation stability of the integrated autotrophic denitrification device is poor, issues a second alarm signal, and performs a shutdown and detailed inspection of the device.

[0177] S30 is the operational stability evaluation value set within the central control analysis module.

[0178] This invention, through the processing and summarization of data acquired at various monitoring times, generates a rate change curve. Based on the actual fluctuation amplitude determined by the rate change curve, the operational stability of the integrated autotrophic denitrification device is accurately judged, thereby increasing the operational safety of the device.

[0179] The calculation compensation parameters and calculation adjustment parameters described in this invention serve two purposes: first, to balance the left and right dimensions of the formula; and second, to adjust the numerical results. In this embodiment, no specific values ​​are assigned. Furthermore, in this embodiment, each calculation formula is used to intuitively reflect the adjustment relationship between the values, such as positive correlation or negative correlation. Unless otherwise specified, the values ​​of parameters that are not specifically limited are all taken as positive.

[0180] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0181] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated autotrophic nitrogen removal device, characterized in that, include, A pretreatment component is used to pretreat wastewater in advance. The pretreatment component includes an adsorption sedimentation tank, an inlet pump, and a pretreatment baffle. The inlet pump is used to draw the wastewater after adsorption and consumption in the adsorption sedimentation tank into the reaction chamber of the device. The reaction chamber of the device is divided into different reaction chambers according to different wastewater reaction types, including a first reaction chamber and a second reaction chamber. An aeration head is installed between the first reaction chamber and the second reaction chamber. The second reaction chamber is used to provide a reaction site for the anaerobic ammonia oxidation reaction of the wastewater. A short-cut nitrification unit for primary treatment of the wastewater; An anaerobic ammonia oxidation unit is used to perform secondary treatment on the wastewater after the primary treatment. The anaerobic ammonia oxidation unit includes a second reaction chamber and a volcanic rock biological filter. A sludge collection and discharge assembly is used to discharge the sludge that has not been separated after the secondary treatment, and to collect and discharge the obtained reclaimed water. A process isolation component is used to separate suspended solids and solid particles from the pretreated wastewater; The identification and monitoring components include an image acquisition unit and a timing module; The image acquisition device is installed inside the anaerobic ammonia oxidation component to monitor the reaction state inside the anaerobic ammonia oxidation component in real time. The timing module is used to time the attachment and biofilm formation time of anaerobic ammonia-oxidizing bacteria; The components to be identified include the blower, aeration head, central control analysis module, and adjustment module; The blower is used to control the concentration of dissolved oxygen in the volcanic rock biofilter. The aeration head is used to generate sufficient mixing in the aeration zone and to allow the wastewater to circulate. The central control analysis module is connected to the identification and monitoring component, the fan and the aeration head respectively. The image acquisition device is used to acquire real-time images of the distribution of anaerobic ammonia oxidizing bacteria. The central control analysis module analyzes the real-time images and issues corresponding adjustment signals or alarm signals. The adjustment module is used to make corresponding adjustments according to various adjustment signals issued by the central control analysis module, and to determine the number of air holes opened by the aeration head, the placement position of the aeration head in the aeration zone, and the actual rotation speed of the blower. The central control analysis module is equipped with a monitoring cycle, standard dispersion, and dispersion evaluation value. The image acquisition device acquires real-time initial images of the red biofilm in the second reaction chamber at different monitoring times according to the monitoring cycle; The central control analysis module can determine the initial dispersion of the anaerobic ammonia oxidizing bacteria based on the real-time initial image, and determine whether the attachment and biofilm formation of the anaerobic ammonia oxidizing bacteria meets the requirements based on the absolute value of the first difference combined with the dispersion evaluation value. Wherein, the absolute value of the first difference is the absolute value of the difference between the initial dispersion and the standard dispersion.

2. The integrated autotrophic denitrification device according to claim 1, characterized in that, The adsorption sedimentation tank is a pretreatment reaction tank used to adsorb and consume organic matter in wastewater in advance; The pretreatment baffle is used to pre-treat and separate suspended solids and solid particles in the wastewater drawn into the reaction chamber of the device; The short-range nitrification assembly includes a first reaction chamber, a biofilm structure, and a fixed water distributor. The first reaction chamber is used to provide a reaction site for short-cut nitrification of wastewater; The fixed water distributor is used to distribute the water flow evenly; The biofilm structure is used to adsorb and decompose pollutants in the wastewater in suspended, colloidal, and dissolved states; The packing material in the first reaction chamber is made of polyethylene.

3. The integrated autotrophic denitrification device according to claim 2, characterized in that, The volcanic rock biofilter is used to intercept anaerobic ammonia oxidizing bacteria, reduce the loss of anaerobic ammonia oxidizing bacteria, provide an anaerobic environment for the attachment and growth of anaerobic ammonia oxidizing bacteria, and play a role in filtration and adsorption. The packing material in the volcanic rock biofilter is volcanic rock; The sludge collection and discharge assembly includes a sedimentation tank, a sludge discharge pump, and an outlet pipe. The sedimentation tank is used to collect wastewater treated by the short-cut nitrification unit and the anaerobic ammonia oxidation unit; The sludge pump is used to discharge unseparated sludge; The outlet pipe is used to discharge and collect the treated reclaimed water; The process isolation component includes: a first partition, a second partition, and a pebble layer; The first baffle is used to separate suspended solids and solid particles in the wastewater after short-cut nitrification treatment; The second baffle is used to separate suspended solids and solid particles from the wastewater after anaerobic ammonia oxidation treatment; The pebble layer is used for preliminary filtration of larger suspended solids and particles in the wastewater.

4. The integrated autotrophic denitrification device according to claim 3, characterized in that, Since the anaerobic ammonia-oxidizing bacteria's attachment and biofilm formation does not meet the requirements, the central control analysis module can determine whether to issue a first adjustment signal or a second adjustment signal based on the relationship between the initial dispersion and the standard dispersion. The adjustment module can determine the number of air holes to be opened by the aeration head according to the first adjustment signal, and can determine the placement position of the aeration head in the aeration zone according to the second adjustment signal.

5. The integrated autotrophic denitrification device according to claim 4, characterized in that, The timing module is activated based on the determined number of open vents or the placement position of the aeration head. The image acquisition device acquires a first actual image of the second reaction chamber when the monitoring cycle is reached according to the timing module. The central control analysis module can determine the actual dispersion of the anaerobic ammonia oxidizing bacteria based on the first actual image, and determine the first rotational speed of the fan based on the absolute value of the second difference combined with the dispersion evaluation value; Wherein, the absolute value of the second difference is the absolute value of the difference between the actual dispersion and the standard dispersion.

6. The integrated autotrophic denitrification device according to claim 5, characterized in that, The central control analysis module can obtain the real-time distribution area of ​​the anaerobic ammonia oxidizing bacteria at each monitoring time based on the image acquisition device and the monitoring cycle, and can calculate the rate of change of the distribution area in each monitoring cycle based on the real-time distribution area at adjacent monitoring times. The central control analysis module can determine the blockage status of the first partition based on the rate of change of the distribution area and the maximum rate evaluation value set therein.

7. The integrated autotrophic denitrification device according to claim 6, characterized in that, The central control analysis module is equipped with a baffle blockage evaluation interval, wherein the minimum rate evaluation value and the maximum rate evaluation value are the boundary values ​​of the baffle blockage evaluation interval, respectively. The central control analysis module can determine the blockage level of the first baffle based on the rate of change of the distribution area and the baffle blockage evaluation value, and determine the second speed of the fan for different blockage levels, or replace the first baffle.

8. The integrated autotrophic denitrification device according to claim 7, characterized in that, The central control analysis module can generate a rate change curve based on the acquired rate of change of each distribution area, and determine the actual fluctuation amplitude based on the rate change curve. The central control analysis module can determine whether the operating status of the integrated autotrophic denitrification device is good or poor based on the absolute value of the third difference and its set operating stability evaluation value. The third difference absolute value is the absolute value of the difference between the actual fluctuation amplitude value and the standard fluctuation amplitude value set by the central control analysis module.

9. A method for integrated autotrophic nitrogen removal, based on the integrated autotrophic nitrogen removal apparatus according to any one of claims 1-8, characterized in that, include, Step S1 involves pretreating the wastewater to adsorb and consume the organic matter in the wastewater. Step S2: The pretreated wastewater is processed sequentially through a short-cut nitrification section and an anaerobic ammonia oxidation section. The aeration head drives the water flow to mix and introduce some anaerobic ammonia oxidizing bacteria into the short-cut nitrification section to form a biofilm with AOB bacteria. Step S3: Obtain a real-time image of the distribution of anaerobic ammonia oxidizing bacteria in the second reaction chamber, thereby determining the number of air holes opened by the aeration head, the placement position of the aeration head in the aeration zone, and the actual rotation speed of the blower. In step S4, the device operates with defined operating parameters to achieve high-efficiency nitrogen removal.

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