Activated sludge system

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to an activated sludge system. The system comprises: a pretreatment tank; the primary sedimentation tank is communicated with the pretreatment tank through a first conveying pipeline; the aeration tank is internally provided with activated sludge, and the aeration tank is communicated with the primary sedimentation tank through a second conveying pipeline; a first sampler is arranged on the aeration tank; the secondary sedimentation tank is communicated with the aeration tank through a third conveying pipeline; the bottom of the secondary sedimentation tank is communicated with the bottom of the aeration tank through a backflow pipeline, so that part of sludge flows back to the aeration tank; a second sampler is arranged on the secondary sedimentation tank; the oxygen supply device is used for supplying oxygen to the aeration tank; the control device performs the following control: after the first sampler acquires the activated sludge sample of the aeration tank for a preset time, the second sampler acquires an effluent sample of the secondary sedimentation tank; the preset time is the time when the wastewater flows from the sampling point of the first sampler to the sampling point of the second sampler. The system provided by the utility model can synchronously obtain the matched conditions in the pool.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, especially relate to a kind of activated sludge systems. BACKGROUND

[0002] Activated sludge process is widely used in industrial and municipal wastewater treatment due to its economic, strong water quality and quantity adaptability. The actual inflow load cannot only fluctuate within the design range, so timely measures are taken to ensure the stability of activated sludge process, which is the key to continuous compliance of effluent.

[0003] The activated sludge process system in the existing sewage treatment plant mainly collects effluent quality and regularly detects mixed liquid properties (MLSS, MLVSS, SV, SVI), but this control method cannot simultaneously obtain the physicochemical information of the corresponding aeration tank, resulting in unreasonable control. UTILITY MODEL CONTENT

[0004] To solve the above problems in the prior art, the utility model provides an activated sludge system.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is as follows:

[0006] An activated sludge system comprises:

[0007] a pretreatment tank;

[0008] a primary sedimentation tank, which is connected to the pretreatment tank by a first conveying pipe;

[0009] an aeration tank, which has activated sludge inside and is connected to the primary sedimentation tank by a second conveying pipe; a first sampler is arranged on the aeration tank;

[0010] a secondary sedimentation tank, which is connected to the aeration tank by a third conveying pipe; the bottom of the secondary sedimentation tank is connected to the bottom of the aeration tank by a reflux pipe to reflux part of the sludge to the aeration tank; a second sampler is arranged on the secondary sedimentation tank;

[0011] an oxygen supply device, which is used to supply oxygen to the aeration tank;

[0012] a control device, which controls as follows: the first sampler obtains a sample of activated sludge in the aeration tank, and then the second sampler obtains a sample of effluent in the secondary sedimentation tank after a preset time; the preset time is the time for wastewater to flow from the sampling point of the first sampler to the sampling point of the second sampler.

[0013] In an embodiment, the pretreatment tank is embedded with a grid.

[0014] In an embodiment, the grid comprises a coarse grid and a fine grid arranged in sequence along the water flow direction.

[0015] In an embodiment, the bottom of the pre-treatment tank is provided with an aeration device for pre-aeration and agitation.

[0016] In an embodiment, a check valve is arranged on the return pipe communicating with the bottom of the aeration tank.

[0017] In an embodiment, the activated sludge system further comprises:

[0018] a detection device for analyzing the activated sludge sample and the effluent sample to obtain information on the microbial composition in the activated sludge in the aeration tank and information on the effluent quality in the secondary sedimentation tank;

[0019] an analysis device for obtaining activated sludge property evaluation information according to the information on the microbial composition in the activated sludge in the aeration tank, the information on the effluent quality in the secondary sedimentation tank and a preset water quality evaluation system.

[0020] In an embodiment, the activated sludge system further comprises:

[0021] a storage device for storing the activated sludge property evaluation information containing the information on the microbial composition in the activated sludge in the aeration tank.

[0022] In an embodiment, the first sampler obtains the activated sludge sample at the end of the aeration tank.

[0023] In an embodiment, the activated sludge system further comprises:

[0024] a discharge device for discharging the wastewater in the secondary sedimentation tank.

[0025] In an embodiment, the first transfer pipe is provided with a first control valve; and / or

[0026] the second transfer pipe is provided with a second control valve; and / or

[0027] the third transfer pipe is provided with a third control valve.

[0028] Based on the above, compared with the prior art, the activated sludge system provided by the utility model can synchronously obtain corresponding activated sludge samples and effluent samples, so as to comprehensively analyze when needed, thereby realizing reasonable regulation and control of adverse conditions.

[0029] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and advantages of the application can be realized and attained by means of the instrumentalities and combinations particularly pointed out in the description and appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. In the following description, the positional relationship shown in the drawings is the direction of the components drawn in the drawings as the reference, unless otherwise specified.

[0031] Figure 1 The structural schematic diagram of the activated sludge system provided by the first embodiment of the present application is shown in the figure.

[0032] Figure 2 The structural schematic diagram of the activated sludge system provided by the second embodiment of the present application is shown in the figure.

[0033] Reference signs:

[0034] 10, pretreatment tank; 20, primary sedimentation tank; 30, aeration tank; 40, secondary sedimentation tank; 60, control device; 70, detection device; 80, analysis device; 90, storage device. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. The technical features designed in different embodiments of the present application can be combined with each other as long as they do not conflict with each other. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] In the description of the utility model, it is to explain, the utility model uses all the terms (including technical terms and scientific terms) have same meaning with the meaning that the ordinary skill in the art to which the utility model belongs generally understands, cannot be understood as the limitation of the utility model;Should be further understood, the utility model uses the term should be understood as having the meaning consistent with the meaning of these terms in the context of the specification and related art, and should not be understood in an idealized or overly formal sense, except that the utility model is defined thusly.

[0037] Figure 1 The structure schematic view of the activated sludge system provided by the first embodiment of the utility model.

[0038] Please refer to Figure 1 The first embodiment of the utility model provides an activated sludge system, comprising:

[0039] Pretreatment pool 10, primary sedimentation tank 20, aeration tank 30, secondary sedimentation tank 40 and control device 60;

[0040] Wherein, the pretreatment pool 10 is used to remove the large solid and suspended matter in wastewater;Specifically, for example, a grid can be embedded in the pretreatment pool 10 to intercept most of the solid and suspended matter, preventing these solids from causing blockage or damage to subsequent treatment equipment;Preferably, the grid can also be a coarse grid and a fine grid arranged in sequence according to the water flow direction, through the coarse grid to remove the large particles in the wastewater, and then through the fine grid to remove the small particles and suspended matter in the wastewater, thereby better removing the large solid and suspended matter in the wastewater;Preferably, an aeration device for pre-aeration and stirring is arranged at the bottom of the pretreatment pool, wherein pre-aeration can increase the dissolved oxygen concentration in the wastewater, which is beneficial to the aerobic respiration of microorganisms in the subsequent activated sludge, thereby decomposing organic matter.

[0041] In a preferred embodiment, the pretreatment pool 10 can be composed of a grid pool and a conditioning pool, the grid pool is used to remove the large solid and floating matter in wastewater, after the wastewater treated by the grid pool is discharged to the flocculation tank, a flocculating agent can be added to the flocculation tank, and the flocculating agent is uniformly stirred for a period of time, so that the flocculating agent can be uniformly dispersed in the flocculation tank through stirring, thereby more fully contacting the small impurities / particles in the wastewater, improving the efficiency of flocculation, and further removing smaller particles and floating matter in the wastewater.

[0042] The primary sedimentation tank 20 flocculates fine solids into larger particles by natural settling, and removes settleable solids and floatables, thereby reducing the load on subsequent treatment facilities. Furthermore, the primary sedimentation tank 20 can also function to adjust water quality and homogenize the water, by storing and mixing wastewater from different times and different sources, thereby making the water quality in the primary sedimentation tank 20 uniform and reducing the impact of water quality changes on subsequent systems. The primary sedimentation tank 20 is connected to the pretreatment tank 10 by a first transfer conduit. Preferably, a first control valve is provided on the first transfer conduit, thereby achieving control of water flow and sludge flow. The first control valve can be a gate valve, a butterfly valve, a ball valve, a sludge discharge valve, etc.

[0043] The aeration tank 30 contains activated sludge, which can be formed by repeatedly aerating and resting organic wastewater. The activated sludge can contain microorganisms such as aerobic bacteria or protozoa, and dissolved organic matter. The microorganisms in the activated sludge can be selected from species that can metabolize organic matter, such as Didinium, Amoeboide, Nematode, or aerobic bacteria (e.g., Zoogloea). The organic matter can be, for example, surfactants, phenol-containing organic compounds, biphenyl, diphenol compounds, cyclic or long-chain organic compounds such as ethylene oxide derivatives (EOD), etc.

[0044] The aeration tank 30 introduces air into the wastewater through an oxygen supply device, providing sufficient oxygen supply for the microorganisms in the wastewater. This is crucial for the growth and metabolism of aerobic microorganisms, and sufficient oxygen supply not only meets the respiratory needs of microorganisms, but also promotes the growth and reproduction of microorganisms; microorganisms proliferate continuously in the aeration tank 30, forming activated sludge, which has strong adsorption and decomposition capacity and can further remove organic matter and other pollutants in wastewater; and the microorganisms in the aeration tank 30 can obtain energy and nutrients by decomposing organic matter, which helps to convert organic matter into harmless substances such as carbon dioxide, water and biomass; through aeration, the activity of microorganisms is enhanced, thereby improving the degradation efficiency of organic matter. The aeration tank 30 is connected to the primary sedimentation tank 20 by a second conveying pipe; preferably, a second control valve is provided on the second conveying pipe to control the flow of water and sludge, which can be a gate valve, butterfly valve, ball valve, etc.; the aeration tank 30 is provided with a first sampler for obtaining activated sludge samples in the aeration tank 30; preferably, the first sampler is located at a position where activated sludge samples at the end of the aeration tank can be obtained, for example, at the end of the aeration tank. Preferably, the oxygen supply device can also be a device that introduces air into wastewater, such as by mechanical or gas injection.

[0045] The secondary sedimentation tank 40 is used for sludge-water separation of wastewater treated by the aeration tank 30; in the secondary sedimentation tank 40, due to gravity, activated sludge with higher density settles to the bottom of the tank to form a sludge layer, while clear water flows out through an outlet device (such as an overflow weir) for discharge or further use. This process ensures that the suspended solids content of the effluent meets the requirements and is the last key link in wastewater treatment; in addition to sludge-water separation, as activated sludge gradually deposits at the bottom of the secondary sedimentation tank, the sludge layer thickens, and the sludge concentration increases; the concentrated sludge can be returned to the biological treatment section for further treatment, or further treatment and disposal. This process helps to reduce the volume of sludge and reduce treatment costs; based on this, the bottom of the secondary sedimentation tank 40 is connected to the bottom of the aeration tank 30 by a return pipe to return part of the sludge to the aeration tank 30; preferably, a check valve is provided on the return pipe connected to the bottom of the aeration tank 30.

[0046] Moreover, the secondary sedimentation tank 40 can also serve as a place to store activated sludge. When the inflow or water quality changes, the activated sludge in the secondary sedimentation tank 40 can act as a buffer to ensure stable operation of the system. This helps to cope with sudden changes in water quality or water quantity and improves the flexibility and stability of the entire activated sludge system.

[0047] The second sedimentation tank 40 is communicated with the aeration tank 30 through a third conveying pipe; preferably, a third control valve is arranged on the third conveying pipe to control the flow of water and sludge, and the third control valve can be a gate valve, a butterfly valve, a ball valve or the like; the second sedimentation tank 40 is provided with a second sampler; the second sampler is used for sampling effluent water from the second sedimentation tank 40;

[0048] The discharge device 50 is used for discharging wastewater in the second sedimentation tank 40; specifically, the discharge device 50 can be a sludge pump / water pump or the like, which is used for timely discharging excess sludge / water generated in the above treatment process; in a preferred embodiment, the discharge device 50 can also be connected with various parts (for example, the pretreatment tank 10, the primary sedimentation tank 20, the aeration tank 30, the second sedimentation tank 40 and the like) of the activated sludge system through a series of pipes and valves, so as to ensure that sludge can be smoothly discharged from the various treatment tanks.

[0049] The control device 60 controls the second sampler to sample effluent water from the second sedimentation tank 40 after the first sampler samples activated sludge from the aeration tank 30 for a preset time; the preset time is the time for wastewater to flow from the sampling point of the first sampler to the sampling point of the second sampler; through the setting of the control device 60, the corresponding activated sludge sample and the effluent water sample can be synchronously sampled, that is, the activated sludge sample and the effluent water sample are corresponding; thus, the water quality information detected subsequently can match the activated sludge condition in the current sedimentation tank of the water quality sample, so that more comprehensive analysis can be performed when needed, and thus reasonable regulation and control of adverse conditions can be realized.

[0050] Figure 2 A structure diagram of an activated sludge system according to a second embodiment of the present application is shown.

[0051] Please refer to Figure 2 The second embodiment of the present application provides an activated sludge system, which comprises:

[0052] The pretreatment tank 10, the primary sedimentation tank 20, the aeration tank 30, the second sedimentation tank 40, the control device 60, the detection device 70, the analysis device 80 and the storage device 90;

[0053] The pretreatment tank 10, the primary sedimentation tank 20, the aeration tank 30, the second sedimentation tank 40 and the control device 60 are the same as those in the first embodiment, and will not be described in detail here;

[0054] The detection device 70 is used for analyzing the activated sludge sample and the effluent water sample to obtain microbial composition information in the activated sludge in the aeration tank and water quality information of effluent water in the second sedimentation tank;

[0055] In the embodiment, the method for obtaining the information of the microorganism composition in the activated sludge in the aeration tank comprises the following steps:

[0056] An image sample of the activated sludge in the aeration tank is obtained.

[0057] An effective area image with the microorganism topography feature on the image sample is extracted.

[0058] The type and quantity of the microorganism in the sample are identified according to the feature of the microorganism on the effective area image.

[0059] In some embodiments, the sludge at the bottom of the end of the aeration tank is sampled to form a sample, and an image is collected at a magnification of 100-400 times, and an easily observable image is obtained after easy-to-identify processing; color feature extraction, texture feature extraction and shape feature extraction are performed based on the easily observable images, and the microorganism composition in the sample is confirmed by comparing with the single composition standard sample of each type of representative microorganism.

[0060] The color feature extraction comprises a histogram; the color histogram of the pixel value in each segmented area is counted to obtain the distribution information of different color channels (such as RGB or HSV). Specifically, the image in the ocular lens of the sample sent into the optical microscope is photographed by an RGB camera as a detection object, and the RGB image is converted into an HSV image to facilitate subsequent analysis.

[0061] The texture feature extraction comprises GLCM features; the gray-level co-occurrence matrix (Gray-Level Co-occurrence Matrix) features of each area are calculated, including energy, contrast, uniformity, etc., for describing the texture information.

[0062] The shape feature extraction comprises contour features; the contour features of each segmented area are extracted, such as size, shape and biological structures such as spores, capsules and flagella, so as to extract the morphological features of the microorganism in the image.

[0063] Further, the SVM and decision tree model can be used to classify and count each type of microorganism to obtain the information of the microorganism composition in the activated sludge in the aeration tank.

[0064] The analysis device 80 is used to obtain the activated sludge property evaluation information according to the information of the microorganism composition in the activated sludge in the aeration tank, the effluent quality information of the secondary sedimentation tank and a preset water quality evaluation system.

[0065] In the embodiment, the current effluent quality is judged by the effluent quality information of the sedimentation tank combined with the preset water quality evaluation system, and the microbial composition in the activated sludge in the current aeration tank is further proved, which can help to extract the evaluation information of the activated sludge in the aeration tank in the activated sludge system through the current water quality sample, so as to determine whether the system working condition needs to be optimized; the optimizable items of the activated sludge system working condition include at least one of aeration time, aeration amount, stirring intensity, sludge return ratio, or water inflow amount; the water quality evaluation system can be determined according to the wastewater inflow type and the discharge standard; for municipal sewage, COD, SS, total nitrogen, ammonia nitrogen, total phosphorus, color and PH can be selected.

[0066] The storage device 90 is used to store the activated sludge property evaluation information containing the microbial composition information in the activated sludge in the aeration tank, so as to refer to and compare these stored information in the subsequent operation process.

[0067] Preferably, the activated sludge standard database can be formed by obtaining a large amount of activated sludge property evaluation information, which can be used as a reference for subsequent negative feedback optimization.

[0068] The detection device 70 is signal connected with the first sampler and the second sampler respectively; the detection device 70, the analysis device 80 and the storage device 90 are signal connected with each other, and the signal connection mode includes but is not limited to wired connection and wireless connection, and the wireless connection mode can include but is not limited to 3G / 4G / 5G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (ultrawideband) connection, and other now known or future developed wireless connection modes.

[0069] In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present application can only be improved in one or several aspects, and it is not necessary to solve all the technical problems in the prior art or background art at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be regarded as a limitation of the claim.

[0070] Although the terms such as pre-treatment tank, primary settling tank, aeration tank, secondary settling tank, control device, detection device, analysis device and storage device are used more in this paper, the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any additional limitation by interpreting them is contrary to the spirit of the present application; the terms "first", "second", etc. (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not have to describe a specific order or sequence.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An activated sludge system comprising: a pre-treatment tank; a primary settling tank, which is in communication with the pre-treatment tank through a first transfer conduit; an aeration tank, which has activated sludge therein, the aeration tank being in communication with the primary settling tank through a second transfer conduit; a first sampler being provided on the aeration tank; a secondary settling tank, which is in communication with the aeration tank through a third transfer conduit; the bottom of the secondary settling tank being in communication with the bottom of the aeration tank through a return conduit for returning part of the sludge to the aeration tank; a second sampler being provided on the secondary settling tank; an oxygen supply device for supplying oxygen to the aeration tank; a control device for controlling the second sampler to take a sample of effluent from the secondary settling tank after the first sampler takes a sample of activated sludge from the aeration tank for a predetermined time, which is the time for the wastewater to flow from the sampling point of the first sampler to the sampling point of the second sampler.

2. The activated sludge system according to claim 1, wherein: a grid is embedded in the pre-treatment tank.

3. The activated sludge system according to claim 2, wherein: the grid comprises a coarse grid and a fine grid, which are arranged in sequence in the direction of water flow.

4. The activated sludge system according to claim 1, wherein: an aeration device for pre-aeration and agitation is provided at the bottom of the pre-treatment tank.

5. The activated sludge system according to claim 1, wherein: a check valve is provided on the return conduit in communication with the bottom of the aeration tank.

6. The activated sludge system according to claim 1, further comprising: a detection device for analyzing the activated sludge sample and the effluent sample to obtain information on the microbial composition of the activated sludge in the aeration tank and information on the quality of the effluent from the secondary settling tank; an analysis device for obtaining activated sludge property evaluation information based on the information on the microbial composition of the activated sludge in the aeration tank, the information on the quality of the effluent from the secondary settling tank, and a predetermined water quality evaluation system.

7. The activated sludge system according to claim 5, further comprising: a storage device for storing the activated sludge property evaluation information containing the information on the microbial composition of the activated sludge in the aeration tank.

8. The activated sludge system according to claim 1, wherein: the first sampler takes a sample of activated sludge at the end of the aeration tank.

9. The activated sludge system according to claim 1, further comprising: a discharge device for discharging the wastewater in the secondary settling tank.

10. The activated sludge system according to claim 1, wherein: a first control valve is provided on the first transfer conduit; and / or a second control valve is provided on the second transfer conduit; and / or a third control valve is provided on the third transfer conduit. ​ ​ ​

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