Multi-stage wastewater treatment control methods and systems

Abstract

This invention relates to the field of wastewater treatment, specifically to a multi-stage wastewater treatment control method and system. It identifies the filtration state of wastewater in a grit chamber, determines the spatial state of abnormal solid-liquid separation events, and adjusts the wastewater output to the grit chamber accordingly. It also identifies the sludge deposition state in the sedimentation tank and adjusts the liquid extraction operation. Furthermore, it obtains the dissolved oxygen state corresponding to the wastewater flowing through multiple filtration layers in the aeration tank and adjusts the aeration operation of the filtration layers accordingly. Additionally, it adjusts the disinfection operation in the disinfection tank based on the water output state from the aeration tank to the disinfection tank, and performs diversion treatment of the effluent from the disinfection tank based on the water disinfection state within the disinfection tank. This invention can simultaneously adsorb fine impurities within the wastewater and aerate it, allowing dissolved oxygen in the wastewater to fully contact and react with organic matter, thereby improving wastewater purification efficiency and ensuring the stability of effluent quality.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and more particularly to a method and system for multi-stage wastewater treatment control. Background Technology

[0002] Large amounts of wastewater are generated during daily life and production processes. If this wastewater is discharged into rivers or land without proper treatment, it will not only cause secondary pollution to water or land resources but also prevent effective wastewater recycling, exacerbating water scarcity. Wastewater mainly contains garbage, phosphorus / nitrogen-containing substances, bacteria, etc. To ensure that the treated wastewater meets the needs of different applications such as irrigation or drinking, multi-stage treatment is required. For example, invention patent CN106927638A discloses a multi-stage flow-guided MBBR wastewater treatment system and method. This system employs a multi-stage process of "bar + equalization tank + MBBR wastewater treatment system + filter cloth filter + ultraviolet disinfection" to treat wastewater in functional zones within the flow-guided system, obtaining purified water that meets the corresponding water quality requirements. However, the aforementioned wastewater treatment systems and methods do not consider that the decomposition of substances such as phosphorus and nitrogen in wastewater requires specific atmospheric conditions. They simply use conventional methods to introduce air into the wastewater to achieve contact between dissolved oxygen and organic matter. They do not consider that fine impurities inside the wastewater itself will reduce the sufficiency of contact between dissolved oxygen and organic matter, thus failing to improve the efficiency of the internal oxidation and decomposition reaction of the wastewater and reducing the quality of the treated wastewater. Summary of the Invention

[0003] To reduce the impact of fine impurities in wastewater on the sufficient contact between dissolved oxygen and organic matter, thus preventing the incomplete oxidation and decomposition of organic matter and resulting in low wastewater treatment efficiency and unstable effluent quality over long periods, this invention provides a multi-stage wastewater treatment control method, which includes the following steps:

[0004] S100: Identify the filtration status of wastewater in the bar screen to determine the abnormal solid-liquid separation event occurring in the bar screen; adjust the output status of wastewater to the bar screen according to the spatial state of the abnormal solid-liquid separation event.

[0005] S200: Obtain the sludge distribution state in the wastewater in the sedimentation tank to determine whether the wastewater has completed sludge sedimentation; adjust the liquid extraction operation of the wastewater according to the sludge deposition state in the wastewater.

[0006] S300: Obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state.

[0007] S400: Adjust the disinfection operation in the disinfection tank according to the water output status from the aeration tank to the disinfection tank; and divert the effluent from the disinfection tank according to the water disinfection status inside the disinfection tank.

[0008] Preferably, in S100, the filtration state of the wastewater within the bar screen is identified to determine an abnormal solid-liquid separation event occurring within the bar screen; based on the spatial state of the abnormal solid-liquid separation event, the output state of the wastewater to the bar screen is adjusted, specifically as follows:

[0009] The system acquires dynamic images of wastewater flowing through a grid in a grit chamber, and identifies the filtration status of solid waste in the wastewater on the grid from the dynamic images; wherein, the filtration status refers to the effective interception ratio of solid waste in each sub-region of the grid; based on the effective interception ratio, the sub-regions in the grid where solid-liquid separation anomalies occur are determined.

[0010] The spatial distribution location of the sub-region where the solid-liquid separation anomaly occurs is identified from the dynamic image of the flow, and the vortex state of the sewage flow through the grid corresponding to the spatial distribution location is obtained; the output rate and / or output flow rate of the sewage to the grid pool is adjusted according to the vortex state.

[0011] Preferably, in step S200, the distribution state of sludge in the wastewater in the sedimentation tank is obtained to determine whether the wastewater has completed sludge sedimentation; based on the sludge deposition state in the wastewater, the liquid extraction operation of the wastewater is adjusted, specifically as follows:

[0012] The wastewater in the sedimentation tank is subjected to optical scanning detection to obtain the light scattering characteristics of the wastewater to incident light; based on the changing trend of the light scattering characteristics, the change state of sludge distribution density in the wastewater in the sedimentation tank is obtained, thereby determining whether the wastewater has completed sludge sedimentation.

[0013] The location of sludge deposition in the wastewater after sludge settling is obtained, and the corresponding liquid level height for liquid extraction of the wastewater is determined; the extraction flow rate of the liquid extraction is adjusted according to the current corresponding liquid level height.

[0014] Preferably, in step S300, the dissolved oxygen state of the wastewater as it flows 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 as follows:

[0015] Obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the wastewater flows in the aeration tank, compare the dissolved oxygen concentration of each filter layer with the flow rate of oxygen supplied to each filter layer, estimate the efficiency of the oxidation decomposition reaction of the wastewater in each filter layer, and determine the filter layer where the oxidation decomposition reaction is incomplete based on the oxidation decomposition reaction efficiency.

[0016] The oxygen bubble pumping operation to the filter layer is adjusted based on the dissolved oxygen concentration and wastewater flow rate within the filter layer where the incomplete oxidative decomposition event occurs.

[0017] Preferably, in step S400, the disinfection operation in the disinfection tank is adjusted according to the water output status from the aeration tank to the disinfection tank; and the effluent from the disinfection tank is diverted according to the water disinfection status inside the disinfection tank, specifically as follows:

[0018] Based on the water output flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state inside the water body of the disinfection tank is determined; based on the bacterial diffusion state, the disinfection tank is divided into water body zones, thereby adjusting the disinfection operation intensity for different water body sub-regions within the disinfection tank.

[0019] The disinfection duration of the water inside the disinfection tank is obtained, and it is estimated whether the water inside the disinfection tank meets the corresponding water quality conditions. Based on the current water quality conditions met by the water body, the effluent from the disinfection tank is diverted for treatment.

[0020] On the other hand, the present invention provides a multi-stage wastewater treatment control system, the system comprising the following modules:

[0021] The solid-liquid separation identification module is used to identify the filtration status of wastewater in the bar screen, thereby determining the abnormal solid-liquid separation events that occur in the bar screen.

[0022] The wastewater output adjustment module is used to adjust the output state of the wastewater to the bar screen according to the spatial state of the solid-liquid separation abnormal event.

[0023] The sludge settling identification module is used to obtain the sludge distribution state in the wastewater in the settling tank, thereby determining whether the wastewater has completed sludge settling.

[0024] The liquid extraction adjustment module is used to adjust the liquid extraction operation of the wastewater according to the sludge deposition state in the wastewater.

[0025] An aeration operation adjustment module is used to obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state.

[0026] 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.

[0027] The effluent diversion module is used to divert the effluent from the disinfection tank according to the disinfection status of the water inside the disinfection tank.

[0028] Preferably, the solid-liquid separation identification module is used to identify the filtration status of wastewater in the bar screen, thereby determining any abnormal solid-liquid separation events occurring in the bar screen, specifically:

[0029] The system acquires dynamic images of wastewater flowing through a grid in a grit chamber, and identifies the filtration status of solid waste in the wastewater on the grid from the dynamic images; wherein, the filtration status refers to the effective interception ratio of solid waste in each sub-region of the grid; based on the effective interception ratio, the sub-regions in the grid where solid-liquid separation anomalies occur are determined.

[0030] The wastewater output adjustment module is used to adjust the output state of the wastewater to the bar screen according to the spatial state of the solid-liquid separation anomaly event, specifically:

[0031] The spatial distribution location of the sub-region where the solid-liquid separation anomaly occurs is identified from the dynamic image of the flow, and the vortex state of the sewage flow through the grid corresponding to the spatial distribution location is obtained; the output rate and / or output flow rate of the sewage to the grid pool is adjusted according to the vortex state.

[0032] Preferably, the sludge sedimentation identification module is used to obtain the sludge distribution state in the wastewater in the sedimentation tank, thereby determining whether the wastewater has completed sludge sedimentation, specifically as follows:

[0033] The wastewater in the sedimentation tank is subjected to optical scanning detection to obtain the light scattering characteristics of the wastewater to incident light; based on the changing trend of the light scattering characteristics, the change state of sludge distribution density in the wastewater in the sedimentation tank is obtained, thereby determining whether the wastewater has completed sludge sedimentation.

[0034] The liquid extraction adjustment module is used to adjust the liquid extraction operation of the wastewater according to the sludge deposition state in the wastewater, specifically as follows:

[0035] The location of sludge deposition in the wastewater after sludge settling is obtained, and the corresponding liquid level height for liquid extraction of the wastewater is determined; the extraction flow rate of the liquid extraction is adjusted according to the current corresponding liquid level height.

[0036] Preferably, the aeration operation adjustment module is used to obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state, specifically as follows:

[0037] Obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the wastewater flows in the aeration tank, compare the dissolved oxygen concentration of each filter layer with the flow rate of oxygen supplied to each filter layer, estimate the efficiency of the oxidation decomposition reaction of the wastewater in each filter layer, and determine the filter layer where the oxidation decomposition reaction is incomplete based on the oxidation decomposition reaction efficiency.

[0038] The oxygen bubble pumping operation to the filter layer is adjusted based on the dissolved oxygen concentration and wastewater flow rate within the filter layer where the incomplete oxidative decomposition event occurs.

[0039] Preferably, 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 as follows:

[0040] Based on the water output flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state inside the water body of the disinfection tank is determined; based on the bacterial diffusion state, the disinfection tank is divided into water body zones, thereby adjusting the disinfection operation intensity for different water body sub-regions within the disinfection tank.

[0041] The effluent diversion module is used to divert the effluent from the disinfection tank according to the disinfection status of the water inside the disinfection tank, specifically as follows:

[0042] The disinfection duration of the water inside the disinfection tank is obtained, and it is estimated whether the water inside the disinfection tank meets the corresponding water quality conditions. Based on the current water quality conditions met by the water body, the effluent from the disinfection tank is diverted for treatment.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The filtration status of wastewater within the bar screen is identified to determine any abnormal solid-liquid separation events occurring within the screen. Based on the spatial state of these abnormal events, the wastewater output to the bar screen is adjusted. This process prevents wastewater from forming eddies within the bar screen, which could negatively impact the bar screen's filtration efficiency for solid waste. It also reduces the flow intensity of wastewater within the bar screen, minimizing the probability of eddies and maximizing the bar screen's efficiency in intercepting solid waste.

[0045] The distribution of sludge in the wastewater within the sedimentation tank is obtained to determine whether sludge sedimentation has been completed. Based on the sludge deposition state, the liquid extraction operation of the wastewater is adjusted. Through this process, the sedimentation trend of sludge in the wastewater is accurately determined, sludge deposition efficiency is improved, water free of sludge impurities is obtained to the maximum extent, and the wastewater recycling rate is increased.

[0046] The dissolved oxygen levels of wastewater as it flows through multiple filtration layers in the aeration tank are obtained. Based on these dissolved oxygen levels, the aeration operation of the filtration layers is adjusted. This process ensures that sufficient oxygen is dissolved in the wastewater during its passage through each filtration layer for the oxidation and decomposition of organic matter, while also preventing the waste caused by excessive dissolved oxygen, thereby improving the efficiency of the internal oxidation and decomposition reaction in the wastewater.

[0047] Based on the water output from the aeration tank to the disinfection tank, the disinfection operation within the disinfection tank is adjusted; based on the disinfection status of the water inside the disinfection tank, the effluent from the disinfection tank is diverted for treatment. Through the above process, it is ensured that the water in the disinfection tank receives sufficient disinfection intensity, and by diverting the effluent from the disinfection tank, the effluent can be used for irrigation or drinking water, thereby improving wastewater purification efficiency and ensuring the stability of effluent quality. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0049] Figure 1 This is a flowchart of the multi-stage wastewater treatment control method provided by the present invention.

[0050] Figure 2 It is a multi-stage tank structure corresponding to multi-stage sewage treatment.

[0051] Figure 3 It refers to the overall structure of the aeration tank.

[0052] Figure 4 This is a structural diagram of the multi-stage wastewater treatment and control system provided by the present invention. Detailed Implementation

[0053] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and not for limiting the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all structures. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0054] The terms "comprising" and "having," and any variations thereof, used in this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] Please see Figure 1 As shown, the present invention provides a multi-stage wastewater treatment control method, which includes the following steps:

[0057] S100: Identify the filtration status of wastewater in the bar screen to determine any abnormal solid-liquid separation events occurring in the bar screen; adjust the wastewater output status to the bar screen based on the spatial state of the abnormal solid-liquid separation events.

[0058] Furthermore, in S100, the filtration state of the wastewater within the grit chamber is identified to determine any abnormal solid-liquid separation events occurring within the grit chamber; based on the spatial state of these abnormal events, the wastewater output to the grit chamber is adjusted, specifically as follows:

[0059] The system acquires dynamic images of wastewater flowing through the grid in a grit chamber, and identifies the filtration status of solid waste on the grid from these images. The filtration status refers to the effective interception ratio of solid waste in each sub-region of the grid. Based on the effective interception ratio, the sub-regions in the grid where abnormal solid-liquid separation events occur are determined.

[0060] The spatial distribution of sub-regions where solid-liquid separation anomalies occur is identified from dynamic images, and the vortex state of sewage flowing through the grid corresponding to the spatial distribution location is obtained; based on the vortex state, the output rate and / or output flow rate of sewage to the grid tank are adjusted.

[0061] The multi-stage wastewater treatment of this invention employs, for example... Figure 2 The multi-stage tank structure shown includes, along the wastewater transport direction, a screen tank, a sedimentation tank, an aeration tank, and a disinfection tank. Wastewater collected from the wastewater source is input into the multi-stage tank structure, where solid waste is intercepted and filtered in the screen tank, sludge is separated and settled in the sedimentation tank, organic matter undergoes aeration and decomposition in the aeration tank, and sterilization and purification are carried out in the disinfection tank. This comprehensive treatment of the wastewater involves filtering, inactivating, and purifying harmful substances, converting the wastewater into purified water that meets preset water quality requirements for irrigation or drinking water applications.

[0062] The bar screen contains multiple layers of screens, each with a different mesh size. Typically, these screens are spaced apart along the wastewater flow direction, with the mesh size gradually decreasing in that direction. When wastewater enters the bar screen and flows through these screens, larger solid waste particles are initially intercepted and filtered. Each screen can intercept solid waste of a matching size. However, the irregular shapes and sizes of solid waste within the wastewater, coupled with the multiple screens, can disrupt normal wastewater flow, creating eddies. Solid waste carried by these eddies may pass through the screen mesh and fail to be effectively intercepted, reducing the bar screen's filtration efficiency. To prevent these eddies from hindering the screens' ability to intercept solid waste, it is necessary to suppress and reduce their formation. Specifically, the dynamic flow image of wastewater passing through each grid in the grit chamber is first identified to obtain the effective interception ratio of solid waste in each sub-region within the global scope of the grit chamber. This effective interception ratio refers to the ratio between the actual amount of solid waste intercepted in each sub-region per unit time and the amount of solid waste carried by the wastewater 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 threshold, a solid-liquid separation anomaly is determined for the corresponding sub-region, meaning that the grit section of the corresponding sub-region cannot effectively intercept and separate solid waste from the wastewater. Then, the spatial distribution locations of all sub-regions where solid-liquid separation anomalies occurred are identified from the aforementioned dynamic images. Based on these spatial distribution locations, the location and velocity of eddies as wastewater passes through the grid are identified and extracted from the dynamic images. According to these eddy states, the output rate and / or flow rate of wastewater to the grid pool at the locations where eddies exist and their adjacent locations are adaptively reduced, thereby smoothing the flow intensity of wastewater inside the grid pool, minimizing the probability of wastewater eddies occurring in the grid pool, and improving the grid's interception efficiency for solid waste.

[0063] S200: Obtain the sludge distribution status in the wastewater in the sedimentation tank to determine whether the sludge sedimentation has been completed; adjust the liquid extraction operation of the wastewater according to the sludge deposition status in the wastewater.

[0064] Furthermore, in S200, the distribution state of sludge in the wastewater in the sedimentation tank is obtained to determine whether sludge sedimentation has been completed; based on the sludge deposition state in the wastewater, the liquid extraction operation of the wastewater is adjusted, specifically as follows:

[0065] The wastewater in the sedimentation tank is subjected to optical scanning detection to obtain the light scattering characteristics of the wastewater to incident light; based on the changing trend of the light scattering characteristics, the change state of sludge distribution density in the wastewater in the sedimentation tank is obtained, thereby determining whether the wastewater has completed sludge sedimentation.

[0066] Obtain the sludge deposition location in the wastewater after sludge settling, and determine the corresponding liquid level height for liquid extraction; adjust the extraction flow rate based on the current liquid level height.

[0067] Sedimentation tanks are used to receive wastewater that has been treated by a bar screen. This wastewater contains a large amount of sludge, which spreads throughout the wastewater as it flows. A bar screen alone cannot completely filter the sludge. When the wastewater is delivered to the sedimentation tank, it is stirred and allowed to settle. The sludge settles at the bottom, separating the water from the sludge. Considering the small particle size of the sludge, visual inspection alone is insufficient to accurately determine if the sludge has completely settled at the bottom. Therefore, visible light can be projected onto the wastewater in the sedimentation tank. When the sludge has not completely settled at the bottom, it is diffused within the wastewater. When visible light passes through the wastewater, it is scattered by the sludge. The intensity of visible light scattering in the wastewater is positively correlated with the sludge concentration. By detecting the change in the intensity of the scattered visible light over time, the change in sludge density can be calculated. When the sludge density reaches its minimum, the wastewater is considered to have completed sludge sedimentation; otherwise, the sludge has not settled. The sludge content in wastewater determines the deposition level of the sludge after sedimentation. Once the sludge sedimentation is complete, the deposition level of the sludge in the wastewater is determined to establish the appropriate liquid level for liquid extraction, i.e., the level of the clear water within the wastewater. This information is used to adjust the extraction flow rate for extracting the clear water. Generally, a higher water level indicates less sludge deposited in the wastewater, thus increasing the extraction flow rate. Conversely, a lower water level indicates a lower sludge content, maximizing the extraction of sludge-free water and improving the wastewater recycling rate.

[0068] S300: Obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state.

[0069] Furthermore, in S300, the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank is obtained. Based on the dissolved oxygen state, the aeration operation of the filter layers is adjusted, specifically as follows:

[0070] Obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the wastewater flows in the aeration tank, compare the dissolved oxygen concentration of each filter layer with the flow rate of oxygen supplied to each filter layer, estimate the efficiency of the oxidation decomposition reaction of the wastewater in each filter layer, and determine the filter layer where the oxidation decomposition reaction is incomplete based on the oxidation decomposition reaction efficiency.

[0071] Adjust the oxygen bubble pump operation to the filter layer based on the dissolved oxygen concentration and wastewater flow rate in the filter layer where the incomplete oxidative decomposition event occurs.

[0072] Wastewater contains impurities smaller than sludge particles, which cannot be removed by sedimentation. It also contains a large amount of organic matter, which dissolves in the water and causes eutrophication. To achieve both efficient adsorption of fine impurities and complete oxidation and decomposition of organic matter in wastewater, a method such as... Figure 3 The aeration tank shown contains multiple layers of filter media. These filter media, arranged sequentially along the wastewater flow direction, consist of pebbles, gravel, and activated carbon. Each layer of filter media has an independent aeration inlet pipe, and each aeration outlet pipe delivers micron-sized oxygen bubbles to its corresponding filter layer. These oxygen bubbles are generated using a micro / nano bubble generator, and the flow rate of oxygen bubbles delivered to each filter layer can be independently controlled. When the oxygen bubbles are delivered into the wastewater, they form dissolved oxygen. This dissolved oxygen reacts with the organic matter in the wastewater, causing the organic matter to decompose and form reactive gases such as carbon dioxide. The above analysis shows that the dissolved oxygen concentration in the wastewater directly affects the efficiency of the oxidative decomposition reaction of organic matter. Simultaneously, the concentration of fine impurities in the wastewater also affects the dissolved oxygen concentration. Higher concentrations of fine impurities lead to the capture of oxygen bubbles, preventing them from fully contacting the organic matter in the wastewater. To ensure sufficient oxygen dissolves as wastewater flows through multiple layers of filter media in the aeration tank, dissolved oxygen sensors are used to obtain the dissolved oxygen concentration at each of the filter layers. The dissolved oxygen concentration at each layer is compared with the oxygen flow rate supplied to that layer to estimate the oxidation-decomposition efficiency at each filter layer. This efficiency refers to the amount of organic matter oxidized and decomposed per unit time at each filter layer. This efficiency can be calculated using the dissolved oxygen concentration at each filter layer, the volume of oxygen supplied per unit time, and the reaction formula for the oxidation-decomposition of organic matter in the wastewater. This efficiency is then compared to a preset efficiency threshold. If the efficiency is lower than the threshold, an insufficient oxidation-decomposition event is identified; otherwise, no event is considered. Based on the dissolved oxygen concentration and wastewater flow rate at the filter layer where the insufficient event occurred, the oxygen bubble pump flow rate is adjusted to ensure sufficient oxygen dissolves for organic matter oxidation and decomposition while avoiding waste due to excessive dissolved oxygen.

[0073] S400: Adjust the disinfection operation in the disinfection tank according to the water output status from the aeration tank to the disinfection tank; and divert the effluent from the disinfection tank according to the water disinfection status inside the disinfection tank.

[0074] Furthermore, in S400, the disinfection operation in the disinfection tank is adjusted according to the water output status from the aeration tank to the disinfection tank; and the effluent from the disinfection tank is diverted for treatment according to the water disinfection status inside the disinfection tank, specifically as follows:

[0075] Based on the water output flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state inside the water body of the disinfection tank is determined; based on the bacterial diffusion state, the disinfection tank is divided into water body zones, thereby adjusting the disinfection operation intensity of different water body sub-regions within the disinfection tank.

[0076] Obtain the disinfection duration of the water inside the disinfection tank and estimate whether the water inside the disinfection tank meets the corresponding water quality conditions; based on the current water quality conditions met by the water body, divert the effluent from the disinfection tank for treatment.

[0077] After the wastewater undergoes adsorption of fine impurities and oxidative decomposition of organic matter in the aeration tank, it still contains active bacteria, which can affect water quality. To improve water quality, the wastewater needs to be transferred to a disinfection tank for sterilization. Therefore, based on the water flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state within the disinfection tank is determined. This bacterial diffusion state can be, but is not limited to, the spatial state of bacterial movement within the water body. Based on this bacterial diffusion state, the wastewater in the disinfection tank is divided into zones to determine the bacterial enrichment concentration. This allows for adjustments to the disinfection intensity in sub-zones with different bacterial enrichment concentrations within the disinfection tank. The disinfection intensity can be, but is not limited to, the intensity of ultraviolet (UV) irradiation. In addition, the duration of water disinfection inside the disinfection tank (such as the duration of ultraviolet disinfection irradiation) is obtained to estimate whether the water inside the disinfection tank meets the corresponding water quality conditions. That is, it is estimated whether the average bacterial concentration of the water inside the disinfection tank reaches the bacterial concentration conditions corresponding to the quality of irrigation water or drinking water. In this way, the effluent from the disinfection tank is diverted for treatment, so that the effluent from the disinfection tank can be used as irrigation water or drinking water, thereby improving the wastewater purification efficiency and ensuring the stability of effluent quality.

[0078] Please see Figure 4 As shown, the present invention provides a multi-stage wastewater treatment control system, which includes the following modules:

[0079] The solid-liquid separation identification module is used to identify the filtration status of wastewater in the bar screen, thereby determining any abnormal solid-liquid separation events that occur in the bar screen.

[0080] The wastewater output adjustment module is used to adjust the wastewater output to the bar screen based on the spatial state of the solid-liquid separation abnormal event.

[0081] The sludge settling identification module is used to obtain the sludge distribution status in the wastewater in the settling tank, so as to determine whether the wastewater has completed sludge settling;

[0082] The liquid extraction adjustment module is used to adjust the liquid extraction operation of the wastewater according to the sludge deposition state in the wastewater.

[0083] The aeration operation adjustment module is used to obtain the dissolved oxygen status of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen status.

[0084] 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.

[0085] The effluent diversion module is used to divert the effluent from the disinfection tank according to the disinfection status of the water inside the disinfection tank.

[0086] Furthermore, the solid-liquid separation identification module is used to identify the filtration status of wastewater within the grit chamber, thereby determining any abnormal solid-liquid separation events occurring within the grit chamber, specifically:

[0087] The system acquires dynamic images of wastewater flowing through the grid in a grit chamber, and identifies the filtration status of solid waste on the grid from these images. The filtration status refers to the effective interception ratio of solid waste in each sub-region of the grid. Based on the effective interception ratio, the sub-regions in the grid where abnormal solid-liquid separation events occur are determined.

[0088] The wastewater output adjustment module is used to adjust the wastewater output to the bar screen based on the spatial state of abnormal solid-liquid separation events. Specifically:

[0089] The spatial distribution of sub-regions where solid-liquid separation anomalies occur is identified from dynamic images, and the vortex state of sewage flowing through the grid corresponding to the spatial distribution location is obtained; based on the vortex state, the output rate and / or output flow rate of sewage to the grid tank are adjusted.

[0090] Furthermore, the sludge settling identification module is used to obtain the sludge distribution state in the wastewater in the settling tank, thereby determining whether the wastewater has completed sludge settling. Specifically:

[0091] The wastewater in the sedimentation tank is subjected to optical scanning detection to obtain the light scattering characteristics of the wastewater to incident light; based on the changing trend of the light scattering characteristics, the change state of sludge distribution density in the wastewater in the sedimentation tank is obtained, thereby determining whether the wastewater has completed sludge sedimentation.

[0092] The liquid extraction adjustment module is used to adjust the liquid extraction operation of wastewater according to the sludge deposition state in the wastewater, specifically:

[0093] Obtain the sludge deposition location in the wastewater after sludge settling, and determine the corresponding liquid level height for liquid extraction; adjust the extraction flow rate based on the current liquid level height.

[0094] Furthermore, the aeration operation adjustment module is used to obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjusts the aeration operation of the filter layers according to the dissolved oxygen state, specifically as follows:

[0095] Obtain the dissolved oxygen concentration corresponding to each of the multiple filter layers through which the wastewater flows in the aeration tank, compare the dissolved oxygen concentration of each filter layer with the flow rate of oxygen supplied to each filter layer, estimate the efficiency of the oxidation decomposition reaction of the wastewater in each filter layer, and determine the filter layer where the oxidation decomposition reaction is incomplete based on the oxidation decomposition reaction efficiency.

[0096] Adjust the oxygen bubble pump operation to the filter layer based on the dissolved oxygen concentration and wastewater flow rate in the filter layer where the incomplete oxidative decomposition event occurs.

[0097] 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:

[0098] Based on the water output flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state inside the water body of the disinfection tank is determined; based on the bacterial diffusion state, the disinfection tank is divided into water body zones, thereby adjusting the disinfection operation intensity of different water body sub-regions within the disinfection tank.

[0099] The effluent diversion module is used to divert the effluent from the disinfection tank according to the disinfection status of the water inside the disinfection tank, specifically as follows:

[0100] Obtain the disinfection duration of the water inside the disinfection tank and estimate whether the water inside the disinfection tank meets the corresponding water quality conditions; based on the current water quality conditions met by the water body, divert the effluent from the disinfection tank for treatment.

[0101] The operation and effect of the multi-stage wastewater treatment control system of the present invention are consistent with the above-mentioned multi-stage wastewater treatment control method, and the multi-stage wastewater treatment control system will not be described again here.

[0102] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of a necessary general-purpose hardware platform, or by a combination of hardware and software. Based on this understanding, the above technical solutions, in essence or the part 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.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Other embodiments may also be used. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage wastewater treatment and control method, characterized in that, The method includes the following steps: S100: Identify the filtration status of wastewater within the bar screen to determine any abnormal solid-liquid separation events occurring within the bar screen; adjust the wastewater output to the bar screen based on the spatial state of the abnormal solid-liquid separation event, specifically: The system acquires dynamic images of wastewater flowing through a grid in a grit chamber, and identifies the filtration status of solid waste in the wastewater on the grid from the dynamic images; wherein, the filtration status refers to the effective interception ratio of solid waste in each sub-region of the grid; based on the effective interception ratio, the sub-regions in the grid where solid-liquid separation anomalies occur are determined. The spatial distribution location of the sub-region where the solid-liquid separation anomaly occurred is identified from the dynamic image of the flow, and the vortex state of the sewage flow through the grid corresponding to the spatial distribution location is obtained; the output rate and / or output flow rate of the sewage to the grid tank is adjusted according to the vortex state. S200: Obtain the sludge distribution state in the wastewater in the sedimentation tank to determine whether the wastewater has completed sludge sedimentation; adjust the liquid extraction operation of the wastewater according to the sludge deposition state in the wastewater, specifically: The wastewater in the sedimentation tank is subjected to optical scanning detection to obtain the light scattering characteristics of the wastewater to incident light; based on the changing trend of the light scattering characteristics, the change state of sludge distribution density in the wastewater in the sedimentation tank is obtained, thereby determining whether the wastewater has completed sludge sedimentation. The location of sludge deposition in the wastewater after sludge settling is obtained, and the liquid level height corresponding to the liquid extraction of the wastewater is determined; the extraction flow rate of the liquid extraction is adjusted according to the current liquid level height. S300: Obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state. S400: Adjust the disinfection operation in the disinfection tank according to the water output status from the aeration tank to the disinfection tank; and divert the effluent from the disinfection tank according to the water disinfection status inside the disinfection tank.

2. The method according to claim 1, characterized in that, In S300, the dissolved oxygen state of the wastewater as it flows 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 as follows: The dissolved oxygen concentrations of the wastewater as it flows through multiple filter layers in the aeration tank are obtained. The dissolved oxygen concentration of each filter layer and the flow rate of oxygen supplied to each filter layer are compared to estimate the efficiency of the oxidative decomposition reaction of the wastewater in each filter layer. Based on the oxidative decomposition reaction efficiency, determine the filter layer where the oxidative decomposition reaction insufficiency event occurs; The oxygen bubble pumping operation to the filter layer is adjusted based on the dissolved oxygen concentration and wastewater flow rate within the filter layer where the incomplete oxidative decomposition event occurs.

3. The method according to claim 1, characterized in that, In S400, the disinfection operation in the disinfection tank is adjusted according to the water output status from the aeration tank to the disinfection tank; the effluent from the disinfection tank is diverted according to the water disinfection status inside the disinfection tank, specifically as follows: Based on the water output flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state inside the water body of the disinfection tank is determined; based on the bacterial diffusion state, the disinfection tank is divided into water body zones, thereby adjusting the disinfection operation intensity for different water body sub-regions within the disinfection tank. The disinfection duration of the water inside the disinfection tank is obtained, and it is estimated whether the water inside the disinfection tank meets the corresponding water quality conditions. Based on the current water quality conditions met by the water body, the effluent from the disinfection tank is diverted for treatment.

4. A multi-stage wastewater treatment and control system, characterized in that, The system includes the following modules: The solid-liquid separation identification module is used to identify the filtration status of wastewater within the grit chamber, thereby determining any abnormal solid-liquid separation events occurring within the grit chamber. Specifically: The system acquires dynamic images of wastewater flowing through a grid in a grit chamber, and identifies the filtration status of solid waste in the wastewater on the grid from the dynamic images; wherein, the filtration status refers to the effective interception ratio of solid waste in each sub-region of the grid; based on the effective interception ratio, the sub-regions in the grid where solid-liquid separation anomalies occur are determined. The wastewater output adjustment module is used to adjust the output state of the wastewater to the bar screen based on the spatial state of the solid-liquid separation anomaly event, specifically: The spatial distribution location of the sub-region where the solid-liquid separation anomaly occurred is identified from the dynamic image of the flow, and the vortex state of the sewage flow through the grid corresponding to the spatial distribution location is obtained; the output rate and / or output flow rate of the sewage to the grid tank is adjusted according to the vortex state. The sludge settling identification module is used to acquire the sludge distribution state in the wastewater in the settling tank, thereby determining whether the wastewater has completed sludge settling. Specifically: The wastewater in the sedimentation tank is subjected to optical scanning detection to obtain the light scattering characteristics of the wastewater to incident light; based on the changing trend of the light scattering characteristics, the change state of sludge distribution density in the wastewater in the sedimentation tank is obtained, thereby determining whether the wastewater has completed sludge sedimentation. The liquid extraction adjustment module is used to adjust the liquid extraction operation of the wastewater according to the sludge deposition state in the wastewater, specifically as follows: The location of sludge deposition in the wastewater after sludge settling is obtained, and the liquid level height corresponding to the liquid extraction of the wastewater is determined; the extraction flow rate of the liquid extraction is adjusted according to the current liquid level height. An aeration operation adjustment module is used to obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state. 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. The effluent diversion module is used to divert the effluent from the disinfection tank according to the disinfection status of the water inside the disinfection tank.

5. The system according to claim 4, characterized in that, The aeration operation adjustment module is used to obtain the dissolved oxygen state of the wastewater as it flows through multiple filter layers in the aeration tank, and adjust the aeration operation of the filter layers according to the dissolved oxygen state, specifically: The dissolved oxygen concentrations of the wastewater as it flows through multiple filter layers in the aeration tank are obtained. The dissolved oxygen concentration of each filter layer and the flow rate of oxygen supplied to each filter layer are compared to estimate the efficiency of the oxidative decomposition reaction of the wastewater in each filter layer. Based on the oxidative decomposition reaction efficiency, determine the filter layer where the oxidative decomposition reaction insufficiency event occurs; The oxygen bubble pumping operation to the filter layer is adjusted based on the dissolved oxygen concentration and wastewater flow rate within the filter layer where the incomplete oxidative decomposition event occurs.

6. The system according to claim 4, characterized in that, 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: Based on the water output flow rate from the aeration tank to the disinfection tank and the bacterial concentration, the bacterial diffusion state inside the water body of the disinfection tank is determined; based on the bacterial diffusion state, the disinfection tank is divided into water body zones, thereby adjusting the disinfection operation intensity for different water body sub-regions within the disinfection tank. The effluent diversion module is used to divert the effluent from the disinfection tank according to the disinfection status of the water inside the disinfection tank, specifically as follows: The disinfection duration of the water inside the disinfection tank is obtained, and it is estimated whether the water inside the disinfection tank meets the corresponding water quality conditions. Based on the current water quality conditions met by the water body, the effluent from the disinfection tank is diverted for treatment.

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