Multi-stage sewage treatment regulation and control method and system

Abstract

The invention relates to the field of sewage treatment, in particular to a multistage sewage treatment regulation and control method and system, the filtering state of sewage in a grid pool is identified, and the space state of a solid-liquid separation abnormal event is determined, so that the output state of the sewage to the grid pool is adjusted; identifying the sludge deposition state in the sewage in the sedimentation tank, and adjusting the liquid extraction operation of the sewage; obtaining a dissolved oxygen state corresponding to the situation that the sewage flows through a plurality of filter layers in the aeration tank, so as to adjust the aeration operation on the filter layers; and according to the water output state of the aeration tank to the disinfection tank, the disinfection operation in the disinfection tank is adjusted, and according to the water disinfection state in the disinfection tank, the effluent of the disinfection tank is subjected to split-flow treatment. The sewage treatment device can adsorb fine impurities in sewage and perform oxygen exposure operation on the sewage, so that dissolved oxygen in the sewage fully contacts and reacts with organic matters, the sewage purification efficiency is improved, and the effluent quality stability is ensured.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to a multi-stage sewage treatment control method and system. Background Art

[0002] A large amount of sewage is generated in the process of life and production. If the sewage is not purified and discharged into rivers or land, it will not only cause secondary pollution to water resources or land resources, but also fail to achieve effective recycling of sewage, exacerbating the tension of water resources. Sewage mainly contains garbage, phosphorus / nitrogen-containing substances, bacteria, etc. In order to ensure that the sewage can meet the needs of different occasions such as irrigation or drinking after purification, the sewage needs to be treated in multiple stages. For example, the invention patent CN106927638A discloses a multi-stage diversion MBBR sewage treatment system and treatment method, which adopts a multi-stage process of "grid + regulating tank + MBBR sewage treatment system + filter cloth filter + ultraviolet disinfection" to perform functional zoning treatment on sewage in the diversion system to obtain purified water that meets the corresponding water quality requirements. However, the above-mentioned sewage treatment system and treatment method do not take into account that the decomposition and treatment of substances such as phosphorus and nitrogen in sewage require specific atmospheric conditions. It only adopts the conventional method of injecting air into the sewage to achieve the contact between dissolved oxygen and organic matter. It does not take into account that the fine impurities in the sewage itself will reduce the adequacy of the contact between dissolved oxygen and organic matter, and cannot improve the efficiency of the oxidation decomposition reaction in the sewage, thereby reducing the effluent quality of the sewage treatment. Summary of the Invention

[0003] In order to reduce the impact of fine impurities in sewage on the contact between dissolved oxygen and organic matter in the water body, thereby preventing the organic matter in the water body from being completely oxidized and decomposed, resulting in low sewage purification efficiency and the inability to maintain stable effluent quality for a long time, the present invention provides a multi-stage sewage treatment control method, which includes the following steps: S100: Identifying the filtration state of sewage in the grille pool, thereby determining a solid-liquid separation abnormality event occurring in the grille pool; adjusting the output state of the sewage to the grille pool according to the spatial state of the solid-liquid separation abnormality event; S200: Obtaining a sludge distribution state in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation; adjusting a liquid extraction operation of the sewage according to the sludge sedimentation state in the sewage; S300: Obtaining the dissolved oxygen status of the sewage flowing through multiple filter layers in the aeration tank, and adjusting the oxygenation operation of the filter layers according to the dissolved oxygen status; S400: adjusting the disinfection operation in the disinfection pool according to the water output status from the aeration pool to the disinfection pool; and performing diversion treatment on the effluent of the disinfection pool according to the water disinfection status inside the disinfection pool.

[0004] Preferably, in S100, the filtration state of the sewage in the grille pool is identified to determine the abnormal solid-liquid separation event occurring in the grille pool; and the output state of the sewage to the grille pool is adjusted according to the spatial state of the abnormal solid-liquid separation event, specifically: Obtaining dynamic images of sewage flowing through a grid mesh within a grid tank, and identifying, from the dynamic images, the filtration status of solid waste in the sewage on the grid mesh; wherein the filtration status refers to the effective interception ratio of solid waste in each sub-region within the grid mesh; and determining, based on the effective interception ratio, the sub-region within the grid mesh where an abnormal solid-liquid separation event occurred; The sub-area where the abnormal solid-liquid separation event occurred is identified from the flow dynamic image at the spatial distribution position of the grille network, and the vortex state of the sewage flowing through the grille network corresponding to the spatial distribution position is obtained; according to the vortex state, the output rate and / or output flow of the sewage to the grille pool is adjusted.

[0005] Preferably, in S200, the sludge distribution state in the sewage in the sedimentation tank is obtained to determine whether the sewage has completed sludge sedimentation; and the liquid extraction operation of the sewage is adjusted according to the sludge sedimentation state in the sewage, specifically: Performing optical scanning on the sewage in the sedimentation tank to obtain light scattering characteristics of the sewage to incident light; obtaining a change state of sludge distribution density in the sewage in the sedimentation tank based on a change trend of the light scattering characteristics, thereby determining whether sludge sedimentation has been completed in the sewage; The sludge deposition position in the sewage after sludge precipitation is obtained, and the liquid level height corresponding to liquid extraction of the sewage is determined; and the extraction flow rate of the liquid extraction is adjusted according to the current liquid level height corresponding to the liquid extraction.

[0006] Preferably, in S300, the dissolved oxygen state corresponding to the sewage flowing through multiple filter layers in the aeration tank is obtained, and the aeration operation of the filter layers is adjusted according to the dissolved oxygen state, specifically: Obtaining the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the sewage flows in the aeration tank, comparing the dissolved oxygen concentration of each filter layer with the flow rate of oxygen delivered to each filter layer, and estimating the efficiency of the oxidative decomposition reaction of the sewage occurring in each filter layer; and determining the filter layer where an insufficient oxidative decomposition reaction event occurs based on the oxidative decomposition reaction efficiency; The oxygen bubble pumping operation to the filter layer is adjusted according to the dissolved oxygen concentration in the filter layer where the insufficient oxidative decomposition reaction occurs and the sewage flow rate.

[0007] Preferably, in S400, the disinfection operation in the disinfection pool is adjusted according to the water output status of the aeration pool to the disinfection pool; and the effluent of the disinfection pool is diverted according to the water disinfection status inside the disinfection pool, specifically: determining a bacterial diffusion state within the water body of the disinfection tank based on the water output flow rate and bacterial concentration of the aeration tank to the disinfection tank; zoning the water body of the disinfection tank based on the bacterial diffusion state, thereby adjusting the disinfection operation intensity of different water body sub-areas in the disinfection tank; Obtain the duration of water disinfection in the disinfection pool, and estimate whether the water body in the disinfection pool meets the corresponding water quality conditions; and divert the effluent of the disinfection pool according to the water quality conditions currently met by the water body.

[0008] In another aspect, the present invention provides a multi-stage sewage treatment control system, the system comprising the following modules: A solid-liquid separation identification module is used to identify the filtration status of sewage in the grid pool, thereby determining the abnormal solid-liquid separation event occurring in the grid pool; A sewage output adjustment module, configured to adjust the output state of the sewage to the grid pool according to the spatial state of the abnormal solid-liquid separation event; The sludge sedimentation identification module is used to obtain the sludge distribution status in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation; a liquid extraction adjustment module, configured to adjust the liquid extraction operation of the sewage according to the sludge deposition state in the sewage; an aeration operation adjustment module, configured to obtain the dissolved oxygen state corresponding to the sewage flowing through the plurality of filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state; A disinfection operation adjustment module, configured to adjust the disinfection operation in the disinfection tank according to the water output status from the aeration tank to the disinfection tank; The water outlet diversion module is used to divert the water outlet of the disinfection pool according to the disinfection status of the water inside the disinfection pool.

[0009] Preferably, the solid-liquid separation identification module is used to identify the filtration state of sewage in the grid pool, thereby determining the abnormal solid-liquid separation event occurring in the grid pool, specifically: Obtaining dynamic images of sewage flowing through a grid mesh within a grid tank, and identifying, from the dynamic images, the filtration status of solid waste in the sewage on the grid mesh; wherein the filtration status refers to the effective interception ratio of solid waste in each sub-region within the grid mesh; and determining, based on the effective interception ratio, the sub-region within the grid mesh where an abnormal solid-liquid separation event occurred; The sewage output adjustment module is used to adjust the output state of the sewage to the grid pool according to the spatial state of the abnormal solid-liquid separation event, specifically: The sub-area where the abnormal solid-liquid separation event occurred is identified from the flow dynamic image at the spatial distribution position of the grille network, and the vortex state of the sewage flowing through the grille network corresponding to the spatial distribution position is obtained; according to the vortex state, the output rate and / or output flow of the sewage to the grille pool is adjusted.

[0010] Preferably, the sludge sedimentation identification module is used to obtain the sludge distribution state in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation, specifically: Performing optical scanning on the sewage in the sedimentation tank to obtain light scattering characteristics of the sewage to incident light; obtaining a change state of sludge distribution density in the sewage in the sedimentation tank based on a change trend of the light scattering characteristics, thereby determining whether sludge sedimentation has been completed in the sewage; The liquid extraction adjustment module is used to adjust the liquid extraction operation of the sewage according to the sludge deposition state in the sewage, specifically: The sludge deposition position in the sewage after sludge precipitation is obtained, and the liquid level height corresponding to liquid extraction of the sewage is determined; and the extraction flow rate of the liquid extraction is adjusted according to the current liquid level height corresponding to the liquid extraction.

[0011] Preferably, the aeration operation adjustment module is used to obtain the dissolved oxygen state corresponding to the sewage flowing through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layer according to the dissolved oxygen state, specifically: Obtaining the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the sewage flows in the aeration tank, comparing the dissolved oxygen concentration of each filter layer with the flow rate of oxygen delivered to each filter layer, and estimating the efficiency of the oxidative decomposition reaction of the sewage occurring in each filter layer; and determining the filter layer where an insufficient oxidative decomposition reaction event occurs based on the oxidative decomposition reaction efficiency; The oxygen bubble pumping operation to the filter layer is adjusted according to the dissolved oxygen concentration in the filter layer where the insufficient oxidative decomposition reaction occurs and the sewage flow rate.

[0012] Preferably, the disinfection operation adjustment module is used to adjust the disinfection operation in the disinfection tank according to the water output status of the aeration tank to the disinfection tank, specifically: determining a bacterial diffusion state within the water body of the disinfection tank based on the water output flow rate and bacterial concentration of the aeration tank to the disinfection tank; zoning the water body of the disinfection tank based on the bacterial diffusion state, thereby adjusting the disinfection operation intensity of different water body sub-areas in the disinfection tank; The water outlet diversion module is used for diverting the water outlet of the disinfection tank according to the water disinfection state inside the disinfection tank, specifically: The water disinfection duration inside the disinfection tank is acquired, and whether the water body inside the disinfection tank satisfies the corresponding water quality condition is estimated; and the water outlet of the disinfection tank is diverted according to the water quality condition currently satisfied by the water body.

[0013] Compared with the prior art, the present application has the following beneficial effects: The filtration state of the sewage in the grid pool is recognized to determine the solid-liquid separation abnormal event occurring in the grid pool; and the output state of the sewage to the grid pool is adjusted according to the spatial state of the solid-liquid separation abnormal event. Through the above process, the vortex of the sewage in the grid pool is avoided to affect the interception filtration rate of the solid waste by the grid net, the flow intensity of the sewage in the grid pool is reduced, the probability of the vortex of the sewage in the grid pool is minimized, and the interception efficiency of the solid waste by the grid net is improved.

[0014] The sludge distribution state in the sewage in the sedimentation tank is acquired to determine whether the sewage completes sludge sedimentation; and the liquid extraction operation on the sewage is adjusted according to the sludge deposition state in the sewage. Through the above process, the sedimentation trend of the sludge in the sewage is accurately determined, the deposition efficiency of the sludge is improved, the water body without sludge impurities is maximized, and the sewage recycling rate is improved.

[0015] The dissolved oxygen state of the sewage flowing through the corresponding filter layers in the aeration tank is acquired, and the oxygen exposure operation on the filter layers is adjusted according to the dissolved oxygen state. Through the above process, it is ensured that the sewage flowing through the corresponding filter layers can dissolve sufficient oxygen for oxidation and decomposition of organic matter, and waste of excessive dissolved oxygen in the sewage is avoided, and the oxidation and decomposition reaction efficiency in the sewage is improved.

[0016] The disinfection operation in the disinfection tank is adjusted according to the water output state of the aeration tank to the disinfection tank; and the water outlet of the disinfection tank is diverted according to the water disinfection state inside the disinfection tank. Through the above process, it is ensured that the water body in the disinfection tank is subjected to sufficient disinfection treatment, and the water outlet of the disinfection tank is diverted to be used as irrigation water or drinking water, the sewage purification efficiency is improved, and the water quality stability is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings. Among them: Figure 1It is a flow chart of the multi-stage sewage treatment control method provided by the present invention.

[0018] Figure 2 It is a multi-stage pool structure corresponding to multi-stage sewage treatment.

[0019] Figure 3 It is the overall structure of the aeration tank.

[0020] Figure 4 It is a structural diagram of the multi-stage sewage treatment control system provided by the present invention. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] The terms "comprise," "comprising," and "having," and any variations thereof, as used herein, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0023] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] See also Figure 1 As shown, the present invention provides a multi-stage sewage treatment control method, which includes the following steps: S100: Identify the filtration state of the sewage in the grille pool to determine the abnormal solid-liquid separation event occurring in the grille pool; adjust the output state of the sewage to the grille pool according to the spatial state of the abnormal solid-liquid separation event.

[0025] Furthermore, in S100, the filtration state of the sewage in the grille pool is identified to determine the abnormal solid-liquid separation event occurring in the grille pool; according to the spatial state of the abnormal solid-liquid separation event, the output state of the sewage to the grille pool is adjusted, specifically: Obtain dynamic images of the flow of sewage through the grid mesh within the grid tank, and identify the filtration status of solid waste in the sewage on the grid mesh from the dynamic images. The filtration status refers to the effective interception ratio of solid waste in each sub-area within the grid mesh. Based on the effective interception ratio, determine the sub-area within the grid mesh where abnormal solid-liquid separation events have occurred. The spatial distribution position of the sub-area where the abnormal solid-liquid separation event occurred in the grid network is identified from the flow dynamic image, and the vortex state of the sewage flowing through the grid network corresponding to the spatial distribution position is obtained; according to the vortex state, the output rate and / or output flow of the sewage to the grid pool is adjusted.

[0026] The multi-stage sewage treatment of the present invention adopts Figure 2 The multi-stage tank structure shown in the figure includes a screen tank, a sedimentation tank, an aeration tank, and a disinfection tank, sequentially along the sewage transmission direction. Sewage collected from the sewage source is input into the multi-stage tank structure, where solid waste is intercepted and filtered in the screen tank, sludge is separated in the sedimentation tank, organic matter is decomposed by oxygen in the aeration tank, and sterilized and purified in the disinfection tank. This comprehensive filtration, inactivation, and purification of harmful substances in the sewage is carried out, converting it into purified water that meets preset water quality requirements and meets the needs of irrigation or drinking water.

[0027] There are multiple screens in the screen pool, each with a different mesh size. Generally speaking, the multiple screens are spaced apart along the flow direction of the sewage, and the mesh space of all screens gradually becomes smaller along the flow direction of the sewage. When the sewage is input into the screen pool and flows through the multiple screens, the solid waste with a larger volume in the sewage will be intercepted and filtered by the screen first. Each screen can intercept and filter solid waste of matching size. In fact, the solid waste inside the sewage has irregular shapes and sizes, and the multiple screens in the screen pool will disrupt the normal flow of sewage in the pool, causing the sewage to generate vortices during the flow, and the solid waste may pass through the mesh of the screen with the vortex and cannot be effectively intercepted, reducing the interception and filtration efficiency of the screen pool for solid waste in the sewage. In order to prevent the sewage vortex in the screen pool from affecting the interception of solid waste by the screen net, it is necessary to suppress and reduce the formation of sewage vortex in the screen pool. Specifically, the system first identifies the dynamic flow of sewage through each grid mesh within the grid pool, and determines the effective interception ratio of solid waste for each sub-region within the global grid mesh. This effective interception ratio refers to the ratio between the amount of solid waste actually intercepted by each sub-region per unit time and the amount of solid waste caused by the sewage to drift in the corresponding space of each sub-region. This effective interception ratio is then compared with a preset interception ratio threshold. If the effective interception ratio is less than the preset interception ratio threshold, it is determined that an abnormal solid-liquid separation event has occurred in the corresponding sub-region, meaning that the grid mesh in the corresponding sub-region is unable to effectively intercept and separate solid waste from sewage. Then, the spatial distribution positions of all sub-areas where abnormal solid-liquid separation events occur in the grille network are identified from the above-mentioned flow dynamic images, and the vortex state of the vortex existence position and vortex speed of the extracted sewage passing through the grille network is identified from the flow dynamic images based on the above-mentioned spatial distribution positions; according to the above-mentioned vortex state, the output rate and / or output flow rate of the sewage from the above-mentioned vortex existence position and other adjacent positions to the grille pool are adaptively reduced, thereby smoothing the flow intensity of the sewage inside the grille pool, minimizing the probability of sewage vortex occurrence in the grille pool and improving the interception efficiency of the grille network for solid waste.

[0028] S200: Obtaining the sludge distribution state in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation; adjusting the liquid extraction operation of the sewage according to the sludge sedimentation state in the sewage.

[0029] Furthermore, in S200, the sludge distribution state in the sewage in the sedimentation tank is obtained to determine whether the sewage has completed sludge sedimentation; according to the sludge sedimentation state in the sewage, the liquid extraction operation of the sewage is adjusted, specifically: Perform optical scanning on the sewage in the sedimentation tank to obtain the light scattering characteristics of the sewage to the incident light; based on the changing trend of the light scattering characteristics, the change state of the sludge distribution density in the sewage in the sedimentation tank is obtained, thereby judging whether the sewage has completed sludge sedimentation; Obtain the sludge deposition position in the sewage after sludge sedimentation, determine the liquid level height corresponding to liquid extraction of the sewage; and adjust the extraction flow rate of the liquid extraction according to the current liquid level height corresponding to the liquid extraction.

[0030] Sedimentation tanks receive wastewater treated by screen tanks. This wastewater contains a large amount of sludge, which spreads throughout the wastewater as it flows. Screens alone cannot completely filter out the sludge. Once the wastewater is transferred to the sedimentation tank, it is agitated and allowed to settle. The sludge settles to the bottom of the wastewater, separating the water from the sludge. Given the small size of sludge particles, visual inspection alone cannot accurately determine whether the sludge has completely settled. To address this issue, visible light is projected onto the wastewater in the sedimentation tank. When the sludge is completely settled at the bottom, the sludge diffuses within the wastewater. As the visible light passes through the wastewater, it is scattered by the sludge. The scattering intensity of the visible light within the wastewater is positively correlated with the sludge concentration within the wastewater. By monitoring the temporal trend of the scattering intensity of the incident visible light, the change in the sludge density within the wastewater can be calculated. When the change in sludge density, indicating that the sludge density has decreased to a minimum, the wastewater is considered to have completely settled. Otherwise, the wastewater is considered to have not yet settled. The sludge content in the sewage determines the height of the sludge deposition position after sedimentation. When the sewage has completed sludge sedimentation, the sludge deposition position in the sewage is obtained to determine the liquid level height corresponding to the liquid extraction of the sewage, that is, the liquid level height of the clear water body in the sewage, and the extraction flow rate of the clear water body from the sewage is adjusted accordingly. Generally speaking, the higher the water level height, the less sludge deposited in the sewage. At this time, the extraction flow rate of the clear water body from the sewage is increased; conversely, the extraction flow rate of the clear water body from the sewage is reduced to maximize the acquisition of water without sludge impurities and improve the sewage recycling rate.

[0031] S300: Obtaining the dissolved oxygen status of sewage flowing through multiple filter layers in the aeration tank, and adjusting the oxygenation operation of the filter layers according to the dissolved oxygen status.

[0032] Furthermore, in S300, the dissolved oxygen state corresponding to the sewage flowing through the multiple filter layers in the aeration tank is obtained, and the aeration operation of the filter layers is adjusted according to the dissolved oxygen state, specifically: Obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the sewage flows in the aeration tank, compare the dissolved oxygen concentration in each filter layer with the flow rate of oxygen delivered to each filter layer, and estimate the efficiency of the oxidative decomposition reaction of the sewage in each filter layer; based on the oxidative decomposition reaction efficiency, determine the filter layer where the oxidative decomposition reaction is insufficient; The oxygen bubble pumping operation to the filter layer is adjusted according to the dissolved oxygen concentration in the filter layer and the sewage flow rate where the insufficient oxidation decomposition reaction occurs.

[0033] There are also impurities in sewage that are smaller than the sludge particles. These impurities cannot be removed by sedimentation and filtration. At the same time, sewage also contains a large amount of organic matter. These organic matter dissolves in water and causes eutrophication of the water body. In order to take into account the efficient adsorption of fine impurities in sewage and the thorough oxidation and decomposition of organic matter in sewage, the following methods are used: Figure 3 The aeration tank shown in the figure is equipped with multiple layers of impurity filter material. These filter materials are arranged in the order of pebbles, gravel, and activated carbon along the flow direction of the sewage. Each layer of filter material is equipped with an independent aeration input pipe. Each aeration output pipe is capable of delivering micron-sized oxygen bubbles to the corresponding layer of filter material. These oxygen bubbles are generated by corresponding micro-nano bubble generators, and each aeration input pipe can independently control the oxygen bubble flow rate to the corresponding layer of filter material. When the oxygen bubbles are delivered into the sewage, they form dissolved oxygen, which reacts with organic matter in the sewage, causing the organic matter to decompose and form reaction gases such as carbon dioxide. The above analysis shows that the dissolved oxygen concentration in the sewage directly affects the efficiency of the oxidative decomposition reaction of organic matter. Furthermore, the concentration of fine impurities in the sewage also affects the dissolved oxygen concentration. If the concentration of fine impurities in the sewage is high, the oxygen bubbles will be trapped by the fine impurities and will not be able to fully contact the organic matter in the sewage. To ensure sufficient dissolved oxygen as wastewater flows through multiple layers of filter material within the aeration tank, a dissolved oxygen sensor is first used to obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the wastewater flows. The dissolved oxygen concentration in each filter layer is then compared with the oxygen flow rate supplied to each filter layer to estimate the efficiency of the wastewater's oxidation decomposition reaction in each filter layer. This efficiency refers to the amount of organic matter undergoing oxidation decomposition in each filter layer per unit time. This efficiency can be calculated using the dissolved oxygen concentration in each filter layer, the volume of oxygen supplied to each filter layer per unit time, and the reaction equation for the oxidation decomposition of organic matter in the wastewater. This efficiency is then compared with a preset efficiency threshold. If the efficiency is less than the threshold, insufficient oxidation decomposition is determined to have occurred in that filter layer; otherwise, insufficient oxidation decomposition is determined to have not occurred in that filter layer. Based on the dissolved oxygen concentration in the filter layer experiencing insufficient oxidation decomposition and the wastewater flow rate, the oxygen bubble pumping rate to the filter layer is then adaptively increased or decreased to ensure sufficient dissolved oxygen for the oxidation decomposition of organic matter while the wastewater flows through the corresponding filter layer and to avoid excessive dissolved oxygen waste.

[0034] S400: adjusting the disinfection operation in the disinfection pool according to the water output status from the aeration pool to the disinfection pool; and diverting the effluent from the disinfection pool according to the water disinfection status inside the disinfection pool.

[0035] Furthermore, in S400, the disinfection operation in the disinfection pool is adjusted according to the water output status of the aeration pool to the disinfection pool; and the effluent of the disinfection pool is diverted according to the water disinfection status inside the disinfection pool, specifically: Determine the bacterial diffusion state within the water body of the disinfection tank based on the water output flow rate and bacterial concentration from the aeration tank to the disinfection tank; and divide the water body of the disinfection tank into zones based on the bacterial diffusion state, thereby adjusting the disinfection operation intensity of different water sub-zones within the disinfection tank. Obtain the duration of water disinfection in the disinfection pool and estimate whether the water body in the disinfection pool meets the corresponding water quality conditions; and divert the effluent from the disinfection pool according to the water quality conditions currently met by the water body.

[0036] After the sewage has absorbed fine impurities and oxidized and decomposed organic matter in the aeration tank, it still contains active bacteria, which can affect water quality. To improve water quality, the sewage needs to be transported to a disinfection tank for disinfection and sterilization. To this end, the bacterial diffusion state within the water body in the disinfection tank is determined based on the water output flow rate and bacterial concentration from the aeration tank to the disinfection tank. This bacterial diffusion state can be, but is not limited to, the spatial state of bacterial diffusion movement within the water body. Based on this bacterial diffusion state, the sewage in the disinfection tank is then divided into water zones to determine the bacterial enrichment concentration within the disinfection tank. This allows the disinfection operation intensity to be adjusted for sub-areas of the water body with different bacterial enrichment concentrations within the disinfection tank. This disinfection operation intensity can be, but is not limited to, the intensity of ultraviolet disinfection irradiation. It is also necessary to obtain the duration of water disinfection inside the disinfection pool (such as the duration of ultraviolet disinfection irradiation) and estimate whether the water body inside the disinfection pool meets the corresponding water quality conditions, that is, to estimate whether the average bacterial concentration of the water body inside the disinfection pool reaches the bacterial concentration content conditions corresponding to the irrigation water quality or drinking water quality, so as to divert the effluent from the disinfection pool and use it as irrigation water or drinking water, thereby improving the sewage purification efficiency and ensuring the stability of the effluent quality.

[0037] See also Figure 4 As shown, the present invention provides a multi-stage sewage treatment control system, which includes the following modules: The solid-liquid separation identification module is used to identify the filtration status of sewage in the grid pool, thereby determining abnormal solid-liquid separation events that occur in the grid pool; The sewage output adjustment module is used to adjust the output state of sewage to the grid pool according to the spatial state of the abnormal event of solid-liquid separation; The sludge sedimentation identification module is used to obtain the sludge distribution status in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation; A liquid extraction adjustment module is used to adjust the liquid extraction operation of the sewage according to the sludge deposition state in the sewage; The oxygen exposure operation adjustment module is configured to obtain a dissolved oxygen state of the sewage flowing through the plurality of filter layers in the aeration tank, and adjust the oxygen exposure operation on the filter layers according to the dissolved oxygen state. The disinfection operation adjustment module is configured to adjust a disinfection operation in the disinfection tank according to a water output state of the aeration tank to the disinfection tank. The effluent diversion module is configured to divert the effluent of the disinfection tank according to a water disinfection state in the disinfection tank.

[0038] Further, the solid-liquid separation identification module is configured to identify a filtration state of the sewage in the grid tank, so as to determine a solid-liquid separation abnormal event occurring in the grid tank. Specifically, the solid-liquid separation identification module is configured to: obtain a flow dynamic image of the sewage passing through the grid net in the grid tank, and identify a filtration state of the solid waste in the grid net from the flow dynamic image, wherein the filtration state refers to an effective interception ratio of each sub-region in the grid net to the solid waste, and determine a sub-region in which the solid-liquid separation abnormal event occurs in the grid net according to the effective interception ratio. The sewage output adjustment module is configured to adjust an output state of the sewage to the grid tank according to a spatial state of the solid-liquid separation abnormal event. Specifically, the sewage output adjustment module is configured to: identify a spatial distribution position of the sub-region in which the solid-liquid separation abnormal event occurs in the grid net from the flow dynamic image, obtain a vortex state of the sewage flowing through the grid net corresponding to the spatial distribution position, and adjust an output rate and / or an output flow of the sewage to the grid tank according to the vortex state.

[0039] Further, the sludge sedimentation identification module is configured to obtain a sludge distribution state in the sewage in the sedimentation tank, so as to determine whether the sewage completes sludge sedimentation. Specifically, the sludge sedimentation identification module is configured to: perform light scanning detection on the sewage in the sedimentation tank to obtain a light scattering feature of the sewage to incident light, and obtain a sludge distribution density change state of the sewage in the sedimentation tank according to a change trend of the light scattering feature, so as to determine whether the sewage completes sludge sedimentation. The liquid extraction adjustment module is configured to adjust a liquid extraction operation on the sewage according to a sludge deposition state in the sewage. Specifically, the liquid extraction adjustment module is configured to: obtain a sludge deposition position in the sewage that completes sludge sedimentation, determine a liquid level height corresponding to the liquid extraction on the sewage, and adjust an extraction flow of the liquid extraction according to the liquid level height currently corresponding to the liquid extraction.

[0040] Further, the oxygen exposure operation adjustment module is configured to obtain a dissolved oxygen state of the sewage flowing through the plurality of filter layers in the aeration tank, and adjust the oxygen exposure operation on the filter layers according to the dissolved oxygen state. Specifically, the oxygen exposure operation adjustment module is configured to: Obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the sewage flows in the aeration tank, compare the dissolved oxygen concentration in each filter layer with the flow rate of oxygen delivered to each filter layer, and estimate the efficiency of the oxidative decomposition reaction of the sewage in each filter layer; based on the oxidative decomposition reaction efficiency, determine the filter layer where the oxidative decomposition reaction is insufficient; The oxygen bubble pumping operation to the filter layer is adjusted according to the dissolved oxygen concentration in the filter layer and the sewage flow rate where the insufficient oxidation decomposition reaction occurs.

[0041] Furthermore, the disinfection operation adjustment module is used to adjust the disinfection operation in the disinfection tank according to the water output status from the aeration tank to the disinfection tank, specifically: Determine the bacterial diffusion state within the water body of the disinfection tank based on the water output flow rate and bacterial concentration from the aeration tank to the disinfection tank; and divide the water body of the disinfection tank into zones based on the bacterial diffusion state, thereby adjusting the disinfection operation intensity of different water sub-zones within the disinfection tank. The effluent diversion module is used to divert the effluent from the disinfection pool according to the disinfection status of the water inside the disinfection pool. Specifically: Obtain the duration of water disinfection in the disinfection pool and estimate whether the water body in the disinfection pool meets the corresponding water quality conditions; and divert the effluent from the disinfection pool according to the water quality conditions currently met by the water body.

[0042] The operation and effects of the multi-stage sewage treatment control system of the present invention correspond to and are consistent with those of the above-mentioned multi-stage sewage treatment control method, and the multi-stage sewage treatment control system will not be described again here.

[0043] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using a general-purpose hardware platform, or alternatively, through a combination of hardware and software. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a computer product. The present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it, and other embodiments may also be used. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-stage sewage treatment control method, characterized in that: The method comprises the following steps: S100: Identifying the filtration state of sewage in the grille pool, thereby determining a solid-liquid separation abnormality event occurring in the grille pool; adjusting the output state of the sewage to the grille pool according to the spatial state of the solid-liquid separation abnormality event; S200: Obtaining a sludge distribution state in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation; adjusting a liquid extraction operation of the sewage according to the sludge sedimentation state in the sewage; S300: Obtaining the dissolved oxygen status of the sewage flowing through multiple filter layers in the aeration tank, and adjusting the oxygenation operation of the filter layers according to the dissolved oxygen status; S400: adjusting the disinfection operation in the disinfection pool according to the water output status from the aeration pool to the disinfection pool; and performing diversion treatment on the effluent of the disinfection pool according to the water disinfection status inside the disinfection pool.

2. The method according to claim 1, characterized in that In S100, the filtration state of the sewage in the grille pool is identified to determine the abnormal solid-liquid separation event occurring in the grille pool; and the output state of the sewage to the grille pool is adjusted according to the spatial state of the abnormal solid-liquid separation event, specifically: Obtaining dynamic images of sewage flowing through a grid mesh within a grid tank, and identifying, from the dynamic images, the filtration status of solid waste in the sewage on the grid mesh; wherein the filtration status refers to the effective interception ratio of solid waste in each sub-region within the grid mesh; and determining, based on the effective interception ratio, the sub-region within the grid mesh where an abnormal solid-liquid separation event occurred; The sub-area where the abnormal solid-liquid separation event occurred is identified from the flow dynamic image at the spatial distribution position of the grille network, and the vortex state of the sewage flowing through the grille network corresponding to the spatial distribution position is obtained; according to the vortex state, the output rate and / or output flow of the sewage to the grille pool is adjusted.

3. The method according to claim 1, characterized in that In S200, the sludge distribution state in the sewage in the sedimentation tank is obtained to determine whether the sewage has completed sludge sedimentation; according to the sludge sedimentation state in the sewage, the liquid extraction operation of the sewage is adjusted, specifically: Performing optical scanning on the sewage in the sedimentation tank to obtain light scattering characteristics of the sewage to incident light; obtaining a change state of sludge distribution density in the sewage in the sedimentation tank based on a change trend of the light scattering characteristics, thereby determining whether sludge sedimentation has been completed in the sewage; The sludge deposition position in the sewage after sludge precipitation is obtained, and the liquid level height corresponding to liquid extraction of the sewage is determined; and the extraction flow rate of the liquid extraction is adjusted according to the current liquid level height corresponding to the liquid extraction.

4. The method according to claim 1, wherein In S300, the dissolved oxygen state corresponding to the sewage flowing through multiple filter layers in the aeration tank is obtained, and the aeration operation of the filter layers is adjusted according to the dissolved oxygen state, specifically: Obtaining the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the sewage flows in the aeration tank, comparing the dissolved oxygen concentration of each filter layer with the flow rate of oxygen delivered to each filter layer, and estimating the efficiency of the oxidative decomposition reaction of the sewage in each filter layer; determining, based on the oxidative decomposition reaction efficiency, a filter layer where an insufficient oxidative decomposition reaction event occurs; The oxygen bubble pumping operation to the filter layer is adjusted according to the dissolved oxygen concentration in the filter layer where the insufficient oxidative decomposition reaction occurs and the sewage flow rate.

5. The method according to claim 1, wherein In S400, the disinfection operation in the disinfection pool is adjusted according to the water output status of the aeration pool to the disinfection pool; and the effluent of the disinfection pool is diverted according to the water disinfection status inside the disinfection pool, specifically: determining a bacterial diffusion state within the water body of the disinfection tank based on the water output flow rate and bacterial concentration of the aeration tank to the disinfection tank; zoning the water body of the disinfection tank based on the bacterial diffusion state, thereby adjusting the disinfection operation intensity of different water body sub-areas in the disinfection tank; Obtain the duration of water disinfection in the disinfection pool, and estimate whether the water body in the disinfection pool meets the corresponding water quality conditions; and divert the effluent of the disinfection pool according to the water quality conditions currently met by the water body.

6. Multi-stage sewage treatment control system, characterized in that: The system includes the following modules: A solid-liquid separation identification module is used to identify the filtration status of sewage in the grid pool, thereby determining the abnormal solid-liquid separation event occurring in the grid pool; A sewage output adjustment module, configured to adjust the output state of the sewage to the grid pool according to the spatial state of the abnormal solid-liquid separation event; The sludge sedimentation identification module is used to obtain the sludge distribution status in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation; a liquid extraction adjustment module, configured to adjust the liquid extraction operation of the sewage according to the sludge deposition state in the sewage; an aeration operation adjustment module, configured to obtain the dissolved oxygen state corresponding to the sewage flowing through the plurality of filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state; A disinfection operation adjustment module, configured to adjust the disinfection operation in the disinfection tank according to the water output status from the aeration tank to the disinfection tank; The water outlet diversion module is used to divert the water outlet of the disinfection pool according to the disinfection status of the water inside the disinfection pool.

7. The system according to claim 6, characterized in that The solid-liquid separation identification module is used to identify the filtration status of sewage in the grid pool, so as to determine the abnormal solid-liquid separation events occurring in the grid pool, specifically: Obtaining dynamic images of sewage flowing through a grid mesh within a grid tank, and identifying, from the dynamic images, the filtration status of solid waste in the sewage on the grid mesh; wherein the filtration status refers to the effective interception ratio of solid waste in each sub-region within the grid mesh; and determining, based on the effective interception ratio, the sub-region within the grid mesh where an abnormal solid-liquid separation event occurred; The sewage output adjustment module is used to adjust the output state of the sewage to the grid pool according to the spatial state of the abnormal solid-liquid separation event, specifically: The sub-area where the abnormal solid-liquid separation event occurred is identified from the flow dynamic image at the spatial distribution position of the grille network, and the vortex state of the sewage flowing through the grille network corresponding to the spatial distribution position is obtained; according to the vortex state, the output rate and / or output flow of the sewage to the grille pool is adjusted.

8. The system according to claim 6, wherein: The sludge sedimentation identification module is used to obtain the sludge distribution status in the sewage in the sedimentation tank to determine whether the sewage has completed sludge sedimentation. Specifically: Performing optical scanning on the sewage in the sedimentation tank to obtain light scattering characteristics of the sewage to incident light; obtaining a change state of sludge distribution density in the sewage in the sedimentation tank based on a change trend of the light scattering characteristics, thereby determining whether sludge sedimentation has been completed in the sewage; The liquid extraction adjustment module is used to adjust the liquid extraction operation of the sewage according to the sludge deposition state in the sewage, specifically: The sludge deposition position in the sewage after sludge precipitation is obtained, and the liquid level height corresponding to liquid extraction of the sewage is determined; and the extraction flow rate of the liquid extraction is adjusted according to the current liquid level height corresponding to the liquid extraction.

9. The system according to claim 6, wherein: The aeration operation adjustment module is used to obtain the dissolved oxygen state corresponding to the sewage flowing through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layer according to the dissolved oxygen state, specifically: Obtaining the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the sewage flows in the aeration tank, comparing the dissolved oxygen concentration of each filter layer with the flow rate of oxygen delivered to each filter layer, and estimating the efficiency of the oxidative decomposition reaction of the sewage in each filter layer; determining, based on the oxidative decomposition reaction efficiency, a filter layer where an insufficient oxidative decomposition reaction event occurs; The oxygen bubble pumping operation to the filter layer is adjusted according to the dissolved oxygen concentration in the filter layer where the insufficient oxidative decomposition reaction occurs and the sewage flow rate.

10. The system according to claim 6, wherein: The disinfection operation adjustment module is used to adjust the disinfection operation in the disinfection tank according to the water output status of the aeration tank to the disinfection tank, specifically: determining a bacterial diffusion state within the water body of the disinfection tank based on the water output flow rate and bacterial concentration of the aeration tank to the disinfection tank; zoning the water body of the disinfection tank based on the bacterial diffusion state, thereby adjusting the disinfection operation intensity of different water body sub-areas in the disinfection tank; The water outlet diversion module is used to divert the water outlet of the disinfection pool according to the disinfection status of the water inside the disinfection pool, specifically: Obtain the duration of water disinfection in the disinfection pool, and estimate whether the water body in the disinfection pool meets the corresponding water quality conditions; and divert the effluent of the disinfection pool according to the water quality conditions currently met by the water body.

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