A teaching experimental device for wastewater treatment using the activated sludge process

Abstract

This invention discloses a teaching experimental device for activated sludge wastewater treatment, comprising: a primary sedimentation and water distribution unit connected to an activated sludge zoned bioreactor unit via an influent pump; the inner and outer annular channels of the activated sludge zoned bioreactor unit being divided into multiple cells by multiple fixed partitions; an aeration assembly located within the inner and outer annular channels; a stirring assembly located within the outer annular channel; a mixed liquor recirculation assembly connected between the inner and outer annular channels; a sludge-water separation unit located below the activated sludge zoned bioreactor unit and connected to the central channel; a siphon drainage assembly connected between the inner annular channel and the sludge-water separation unit; and a sludge recirculation assembly connected between the sludge outlet at the bottom of the sludge-water separation unit and the outer annular channel of the activated sludge zoned bioreactor unit. This experimental device is clear in principle, integrated, simple to operate, provides good wastewater treatment, and is low in cost, making it suitable for use in experimental teaching.

Description

Technical Field

[0001] This invention relates to the field of teaching experimental devices for wastewater treatment, and in particular to an integrated experimental teaching device suitable for multiple uses of activated sludge process in wastewater treatment, with adjustable treatment capacity. Background Technology

[0002] The TML-JPS-081003-2023 edition of the "Guideline for Undergraduate Majors in Water Supply and Drainage Science and Engineering in Higher Education Institutions" stipulates that activated sludge process is a required subject in biological wastewater treatment. However, there are many activated sludge treatment processes, each with its own characteristics and advantages, such as ordinary activated sludge process, completely mixed activated sludge process, anaerobic-aerobic activated sludge process, anoxic-aerobic activated sludge process (multi-stage or single-stage), aerobic-anoxic-aerobic activated sludge process, and A... 2 O, Inverted A 2 Furthermore, the primary sedimentation and water distribution unit, the activated sludge biological treatment unit, and the sludge-water separation and sedimentation unit are all different treatment equipment. Therefore, in the teaching practice, the existing teaching experimental equipment cannot take into account all processes, the treatment capacity cannot be changed, different processes require different equipment, and the area occupied is large, resulting in a shortage of teaching funds and teaching space, and restricting the cultivation of students' innovation and practical abilities.

[0003] In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a teaching experimental device for wastewater treatment using the activated sludge process. This device allows for convenient and free selection of different activated sludge treatment processes for wastewater treatment within the same device, and is applicable to different wastewater volumes. It also provides a visual demonstration of the activated sludge process for wastewater treatment, reducing the cost of experimental equipment and floor space required, thus addressing the aforementioned technical problems in the prior art.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A teaching experimental device for wastewater treatment using the activated sludge process includes:

[0007] The system includes a primary sedimentation and water distribution unit, an activated sludge zoned bioreactor unit, an aeration assembly, a mixing assembly, a mixed liquor recirculation assembly, a siphon drainage assembly, a sludge-water separation unit, and a sludge recirculation assembly; among these components...

[0008] The primary sedimentation and water distribution unit is equipped with a wastewater inlet and a wastewater outlet. The wastewater outlet is connected to the raw water inlet of the activated sludge zoned biological reaction unit via a pipeline equipped with an inlet pump.

[0009] The activated sludge partitioned bioreactor unit includes: a cylindrical structure tank composed of a central channel, an inner annular channel and an outer annular channel. Both the inner and outer annular channels are equipped with multiple detachable partitions, which can divide the inner and outer annular channels into cells of different heights and sizes.

[0010] The aeration components are respectively installed in the inner annular channel and the outer annular channel of the activated sludge partitioned bioreactor unit;

[0011] The stirring assembly is disposed within the inner and outer annular channels of the activated sludge partitioned bioreactor unit;

[0012] The mixed liquor recirculation assembly is connected between the inner annular channel and the outer annular channel of the activated sludge zoned bioreactor unit.

[0013] The sludge-water separation unit is located below the activated sludge partitioned bioreactor unit and is connected to the central channel of the activated sludge partitioned bioreactor unit.

[0014] The siphon drainage component is connected between the annular channel of the activated sludge zoned bioreactor unit and the sludge-water separation unit.

[0015] The sludge return assembly is connected between the sludge discharge port at the bottom of the sludge-water separation unit and the outer annular channel of the activated sludge zoned bioreactor unit.

[0016] Compared with existing technologies, the wastewater activated sludge process treatment teaching experimental device provided by this invention has the following beneficial effects:

[0017] It can easily control the water flow between the various parts, adjust the aeration volume, stirring speed and return flow, and thus combine and construct activated sludge biological treatment processes of different treatment scales and different wastewater treatment processes in the same device. The experimental device has a clear principle, is integrated, and is easy to operate. It has good wastewater treatment effect and low cost, making it suitable for use in experimental teaching. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0019] Figure 1 This is a schematic diagram of the structure of the teaching experimental device for wastewater activated sludge process treatment provided in an embodiment of the present invention.

[0020] Figure 2The diagram shows the structure of the activated sludge partitioned bioreactor unit of the wastewater activated sludge process teaching experimental device provided in the embodiment of the present invention; wherein, (a) is a top view of the activated sludge partitioned bioreactor unit, (b) is a side view of the activated sludge partitioned bioreactor unit, and (c) is another side view of the activated sludge partitioned bioreactor unit.

[0021] Figure 3 This is a schematic diagram of the perforation arrangement of the partition A of the activated sludge partitioned bioreactor unit provided in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the opening arrangement of the partition A1 of the activated sludge partitioned bioreactor unit provided in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the opening arrangement of the partition plates B-B6 of the activated sludge zoned bioreactor unit provided in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the opening arrangement of the partition plate C-C4 of the activated sludge partitioned bioreactor unit provided in an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the water passage arrangement of the partition D of the activated sludge partitioned bioreactor unit provided in an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the gate passage arrangement of the activated sludge zoned bioreactor unit provided in an embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the siphon drainage component of the activated sludge zoned bioreactor unit provided in an embodiment of the present invention.

[0028] In the diagram: 1-Primary sedimentation and water distribution unit; 2-Activated sludge zoned biological reaction unit; 3-Sludge-water separation unit; 4-Aeration component; 5-Agitation component; 6-Sludge return component; 7-Siphon drainage component; 71-Vacuum pump; 72-Controller; 73-Inverted U-shaped drain pipe; 731-Inverted U-shaped pipe; 7311-Inlet pipe; 7312-Drain pipe; 732-Single pipe; 74-Switch controller; 75-Top-opening throat; 76-Bottom-opening throat; 77, 78-Water level sensor; 8-Mixed liquor return component. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specific content of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments, which do not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0030] First, the following explanations are provided for the terms that may be used in this article:

[0031] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0032] The terms “including,” “comprising,” “containing,” “having,” or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, “including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.)” should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0033] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0034] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0035] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0036] The following is a detailed description of the teaching experimental apparatus for wastewater activated sludge treatment provided by this invention. Contents not described in detail in the embodiments of this invention are prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of this invention, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this invention, unless otherwise specified by the manufacturer, are all commercially available conventional products.

[0037] like Figure 1 , Figure 2 As shown, this embodiment of the invention provides a teaching experimental device for wastewater activated sludge treatment, comprising:

[0038] The system includes a primary sedimentation and water distribution unit, an activated sludge zoned bioreactor unit, an aeration assembly, a mixing assembly, a mixed liquor recirculation assembly, a siphon drainage assembly, a sludge-water separation unit, and a sludge recirculation assembly; among these components...

[0039] The primary sedimentation and water distribution unit is equipped with a wastewater inlet and a wastewater outlet. The wastewater outlet is connected to the raw water inlet of the activated sludge zoned biological reaction unit via a pipeline equipped with an inlet pump.

[0040] The activated sludge partitioned bioreactor unit includes: a cylindrical structure tank composed of a central channel, an inner annular channel and an outer annular channel. Both the inner and outer annular channels are equipped with multiple detachable partitions, which can divide the inner and outer annular channels into cells of different heights and sizes.

[0041] The aeration components are respectively installed in the inner annular channel and the outer annular channel of the activated sludge partitioned bioreactor unit;

[0042] The stirring assembly is disposed within the inner and outer annular channels of the activated sludge partitioned bioreactor unit;

[0043] The mixed liquor recirculation assembly is connected between the inner annular channel and the outer annular channel of the activated sludge zoned bioreactor unit.

[0044] The sludge-water separation unit is located below the activated sludge partitioned bioreactor unit and is connected to the central channel of the activated sludge partitioned bioreactor unit.

[0045] The siphon drainage component is connected between the annular channel of the activated sludge partitioned bioreactor unit and the sludge-water separation unit.

[0046] The sludge return assembly is connected between the sludge discharge port at the bottom of the sludge-water separation unit and the outer annular channel of the activated sludge zoned bioreactor unit.

[0047] See Figures 2 to 8 Preferably, in the above method, the total height of the ring-shaped cylindrical structure tank of the activated sludge partitioned bioreactor unit is 600mm, wherein the outer diameter of the outer ring channel is 700mm and the inner diameter is 500mm; the outer diameter of the inner ring channel is 500mm and the inner diameter is 120mm; the outer ring channel is divided into 8 to 10 cells by multiple movable partitions, and the inner ring channel is divided into 6 to 10 cells by multiple movable partitions.

[0048] The outer annular channel and the inner annular channel are adjacent to each other with water passage holes of 10mm to 30mm in height and 100 to 200mm in width at heights of 40mm, 300mm and 550mm respectively, so that the water flow in the outer annular channel and the inner annular channel is a vertically folding flow pattern.

[0049] Preferably, in the above-mentioned device, each of the water passage holes on the inner ring wall between the outer annular channel and the inner annular channel is provided with a movable gate to regulate the water flow. Each movable gate has an opening at a position of 300mm, which is the same as the corresponding water passage hole at 300mm on the inner ring wall. The water flow can be easily controlled by the movable gate.

[0050] Preferably, in the above-mentioned device, the multiple fixed baffles within the outer annular channel of the activated sludge partitioned bioreactor unit include:

[0051] One starting outer partition and multiple outer ring partitions; among them,

[0052] The starting partition is a blind plate with a height of 550mm and no water passage holes;

[0053] Each outer ring baffle is a baffle with multiple water passage holes;

[0054] The multiple fixed partitions within the inner annular channel include:

[0055] One starting inner partition and multiple inner ring partitions; among which,

[0056] The inner partition of the starting point is a blind plate with a height of 550mm and no water passage holes;

[0057] Each inner ring baffle is a baffle with multiple water passage holes.

[0058] Preferably, in the above device, each outer ring partition has three water passage holes with a height of 10mm to 30mm and a width of 50 to 100mm respectively at heights of 40mm, 300mm and 550mm;

[0059] Each inner ring baffle has three water passages with a height of 10mm to 30mm and a width of 100mm to 200mm at heights of 40mm, 300mm, and 550mm, respectively.

[0060] Preferably, in the above-mentioned device, each water passage hole on the outer ring partition and the inner ring partition is provided with a movable gate for regulating water passage, and each movable gate is provided with an opening at 300mm, which is the same in position and size as the water passage hole at 300mm on the corresponding partition.

[0061] Preferably, the above-mentioned device further includes: a box structure, wherein the primary sedimentation and water distribution unit, the activated sludge zoned biological reaction unit, the aeration component, the stirring component, the mixed liquor return component, the siphon drainage component, the sludge-water separation unit, and the sludge return component are all disposed within the box structure.

[0062] Preferably, in the above-mentioned device, the sludge-water separation unit has a cylindrical structure and is concentrically arranged with the activated sludge partitioned bioreactor unit.

[0063] Preferably, in the above-mentioned device, the aeration component includes: an air pump connected to two main branch aeration pipes via a main aeration pipe, each main branch aeration pipe connected to multiple fine branch aeration pipes, each fine branch aeration pipe being equipped with a gas flow meter, and each fine branch aeration pipe having an aeration disc at its end. Specifically, the aeration disc on the fine branch aeration pipe connected to one main branch aeration pipe is located within the cell of the outer annular channel of the activated sludge partitioned bioreactor unit, and the aeration disc on the fine branch aeration pipe connected to the other main branch aeration pipe is located within the inner annular channel of the activated sludge partitioned bioreactor unit.

[0064] The stirring assembly consists of a speed regulator connected to a motor, and the motor connected to a stirring paddle.

[0065] The mixture reflux assembly includes: a mixture reflux pipe equipped with a mixture reflux pump, and a mixture flow meter installed on the mixture reflux pipe;

[0066] The sludge return assembly includes: a sludge return pipe equipped with a sludge return pump, and a sludge flow meter installed on the sludge return pipe.

[0067] Preferably, in the above-mentioned device, the siphon drainage component is provided with two automatic start water levels, namely 300mm automatic start water level and 550mm automatic start water level.

[0068] The experimental teaching device for wastewater treatment using the activated sludge process of this invention is designed to handle a flow rate of 86.4 L / d to 168 L / d. The influent BOD is 130 to 160 mg / L, SS is no higher than 70 mg / L, TN is no more than 50 mg / L, and TP is no more than 5.0 mg / L. The treated effluent has a BOD of less than 6.0 mg / L, COD no more than 30 mg / L, ammonia nitrogen no more than 1.5 mg / L, TN no more than 15 mg / L, and TP no more than 0.3 mg / L. The MLSS in the aerobic tank is 2000 to 3000 mg / L, and the MLSS in the return sludge is 6000 to 9000 mg / L.

[0069] In summary, the device of this invention is a multi-compatible, adjustable-volume, integrated experimental device for wastewater activated sludge treatment. It is low-cost, allows for convenient and flexible selection of the required treatment process, and is applicable to different wastewater volumes. A single device can enable the selection of multiple activated sludge treatment processes, visually demonstrates the treatment results, is easy to use, occupies a small area, and effectively reduces the cost of teaching equipment.

[0070] To more clearly demonstrate the technical solution and its effects provided by the present invention, the following detailed description of the teaching experimental device for wastewater activated sludge treatment provided by the present invention is based on specific embodiments.

[0071] Example 1

[0072] like Figure 1 As shown, this embodiment of the invention provides a teaching experimental device for wastewater activated sludge process treatment, which is a device suitable for teaching experiments on biological treatment of wastewater using the activated sludge process, comprising:

[0073] The system includes a primary sedimentation and water distribution unit, an activated sludge zoned biological reaction unit, a sludge-water separation unit, an aeration assembly, a mixing assembly, a sludge return assembly, a mixed liquor return assembly, and a siphon drainage assembly; among which,

[0074] The primary sedimentation and water distribution unit is a combined water distribution tank, and the raw water is injected into the biological reaction unit by a water pump;

[0075] The activated sludge partitioned bioreactor unit has a cylindrical structure, consisting of inner and outer annular channels; fixed partitions are installed inside the inner and outer annular channels to divide the inner and outer annular channels into cells of different heights and sizes.

[0076] The sludge-water separation unit is located below the activated sludge zoned biological reaction unit, and the two are connected by a central channel in the biological zoned reaction unit.

[0077] The aeration assembly consists of an air pump, a flow meter, and an aeration disc, with each flow meter controlling the aeration volume of each compartment.

[0078] The stirring assembly consists of a speed regulator and a stirring paddle with a motor, and is placed on the activated sludge partitioned bioreactor unit.

[0079] The sludge return assembly consists of a sludge return pump and flow meter and a mixed liquor return pump and flow meter;

[0080] The siphon drainage component is a free-moving type, which can send the treated wastewater from the last compartment of the activated sludge biological reaction unit into the sludge-water separation unit.

[0081] In the above experimental setup, the activated sludge zoned bioreactor unit is composed of cells of different sizes combined to form different bioreactor zones, such as A. 2 The process includes anaerobic, anoxic, and aerobic zones, or aerobic-anoxic-aerobic zones. Each reaction zone is connected to others via water passages on the upper and lower parts of a partition.

[0082] In the above experimental setup, the total height of the activated sludge zoned bioreactor unit is 600 mm; the outer diameter of the outer annular channel is 700 mm and the inner diameter is 500 mm; the outer diameter of the inner annular channel is 500 mm and the inner diameter is 120 mm; the outer annular channel is divided into 8 to 10 cells by multiple fixed partitions, and the inner annular channel is divided into 6 to 10 cells by multiple fixed partitions.

[0083] In the above experimental setup, an inner baffle is installed within the inner annular channel of the activated sludge zoned bioreactor unit, with the structure as follows: Figure 3 As shown, the height is 550mm, and it is a blind plate without water passage holes; an outer starting point partition is set inside the outer annular channel, and the structure is as follows. Figure 4 As shown, the height is 550mm, and it is a blind plate without water passage holes.

[0084] In the activated sludge partitioned bioreactor unit of the above experimental device, all other partitions in the outer annular channel are outer ring partitions. Each outer ring partition has three water passage holes with a height of 10mm to 30mm and a width of 50mm to 100mm at heights of 40mm, 300mm, and 550mm, respectively. All other partitions in the inner annular channel are inner ring partitions. Each inner ring partition has three water passage holes with a height of 10mm to 30mm and a width of 100mm to 200mm at heights of 40mm, 300mm, and 550mm, respectively. On the inner ring wall between the outer and inner rings, water passage holes with a height of 10mm to 30mm and a width of 100mm to 200mm are opened at heights of 40mm, 300mm, and 550mm, respectively. Through these water passage holes, the water flow between the cells of the inner and outer annular channels is an overall up-and-down zigzag flow pattern.

[0085] Each water passage hole on the inner ring wall between the inner ring baffle, outer ring baffle, and inner and outer annular channels is equipped with a movable gate to regulate water flow, such as... Figure 8 As shown, each movable gate has an opening at 300mm, the same position and size as the water passage hole at 300mm on the corresponding partition. This effectively controls the water flow between adjacent cells.

[0086] like Figure 9 As shown, the structure of the above-mentioned siphon drainage assembly includes: at least one water level sensor, a controller, a vacuum pump, an inverted U-shaped drain pipe switch controller, an upper-opening throat plate, and a lower-opening throat plate; wherein,

[0087] Each water level sensor is installed in the last compartment of the activated sludge zoning biological reaction unit, at the designed drainage water level.

[0088] The inverted U-shaped drainage pipe is a pipeline consisting of an inverted U-shaped pipe connected to a single pipe in the middle. One side of the inverted U-shaped pipe serves as the inlet pipe, extending into the last compartment of the activated sludge zoning biological reaction unit, while the other side serves as the drainage pipe, extending into the sludge-water separation unit.

[0089] The inverted U-shaped drain pipe is equipped with an upward-opening throat flap inside each single pipe. This upward-opening throat flap can open upwards and close downwards the single pipe.

[0090] The inverted U-shaped drain pipe has a downward-opening throat flap inside one side of the drain pipe. The downward-opening throat flap can open downwards and close the drain pipe upwards. A switch controller is located below the downward-opening throat flap.

[0091] The vacuum pump is connected to the upper end of the single pipe of the inverted U-shaped drain pipe;

[0092] The controller is electrically connected to the control terminals of the water level sensor, the switch controller, and the vacuum pump, respectively. It can control the vacuum pump to start according to the signal from the water level sensor and control the vacuum pump to stop according to the signal from the switch controller, so as to siphon the treated wastewater from the last compartment of the activated sludge biological reaction unit into the sludge-water separation unit through the inlet and outlet pipes of the inverted U-shaped drainage pipe.

[0093] Based on flow calculations, when the design water depth is 300mm, the water level sensor is placed at 300mm; when the design water depth is 550mm, the water level sensor is placed at 550mm. When the water level in the drainage area reaches the design water level, the controller starts the vacuum pump. Due to the negative pressure, the lower-opening throat closes, and the upper-opening throat opens. The water to be drained is forced into the drainage pipe from the inlet side of the inverted U-shaped pipe by atmospheric pressure. Then, the lower-opening throat opens under the gravity of the water. When it contacts the switch controller, the controller shuts off the vacuum pump, the upper-opening throat closes, and the siphon drainage assembly operates. When the water to be drained is completely drained, the siphon effect is broken, and the siphon drainage assembly returns to the standby mode.

[0094] Preferably, multiple siphon drainage components can be installed according to the required drainage water level. For example, taking two water level sensors as an example, the first water level sensor 77 and the second water level sensor 78 can be installed in the last compartment of the activated sludge partitioned biological reaction unit according to the designed drainage water levels of 300mm and 550mm, respectively (see...). Figure 9 This allows the siphon drainage component to start automatically via water level control, with two selectable water level settings: 300mm and 550mm. The siphon drainage component activates when the set water level is reached and stops after drainage is complete, as the siphon effect is disrupted.

[0095] It is understood that the shape of the device of the present invention is not limited by the schematic diagram, and changes in shape alone are also within the scope of protection of the present invention.

[0096] Example 2

[0097] like Figures 1 to 9 As shown, this embodiment of the invention provides a teaching experimental device for wastewater activated sludge treatment, comprising:

[0098] The system includes: 1. Primary sedimentation and water distribution unit; 2. Activated sludge zoned biological reaction unit; 3. Sludge-water separation unit; 4. Aeration assembly; 5. Mixing assembly; 6. Sludge return assembly; 7. Siphon drainage assembly; and 8. Mixed liquor return assembly.

[0099] The working principle of this device is as follows: Assuming an influent flow rate of 86.4 L / d and MLSS of 2500 mg / L, using an anaerobic-anoxic-aerobic (A2O) treatment process, the calculated volume is: anaerobic tank 5.4 L, anoxic tank 34 L, aerobic tank 40 L, mixed liquor-sludge return ratio 1.0, and sludge return ratio 0.4. Figure 2 As shown in (a), the cell combination method within the activated sludge zoned bioreactor unit 2 is as follows: cell S1 is selected as the anaerobic zone, with baffle B as the middle hole position; cells S2, S3, S4, S5, and S6 are selected as the anoxic zone. Through the corresponding movable gates, the outer ring baffle B1 selects the lower hole for water passage, the outer ring baffle B2 selects the middle hole for water passage, and the outer ring baffle B3 selects the lower hole for water passage. Plate B4 is selected for water passage through the lower hole, and outer ring baffle B5 is selected for water passage through the middle hole. Cells S7, S8, S9, S10, and S11 are selected as aerobic zones. Outer ring baffle B6 is selected for water passage through the lower hole, inner ring wall D at cell S9 is selected for water passage through the middle hole, inner ring baffle C1 is selected for water passage through the lower hole, and inner ring baffle C2 is the middle hole. Cell S12 is the drainage zone, and inner ring baffle C3 is adjusted to a blind plate by a gate control.

[0100] The raw water to be treated is injected into the bottom of the anaerobic zone of the activated sludge biological reaction unit 2 from the primary sedimentation and water distribution unit 1. After passing through the anoxic zone and the aerobic zone, it flows into the drainage zone and is discharged to the sludge-water separation unit 3 through the siphon drainage component 7. The water quality indicators of the overflow water from the sludge-water separation unit are monitored, and excess sludge is discharged.

[0101] In the above device, the siphon drainage component 7 is automatically started by water level control. When the water level reaches 300mm, the siphon drainage component 7 starts. After the drainage is completed, the siphon effect is destroyed and the siphon drainage component 7 stops.

[0102] In the above-mentioned device, the function of aeration component 4 is to aerate and oxygenate the water in the aerobic zone, so that the oxygen content in the water is between 2 and 3 mg / L.

[0103] In the above-mentioned device, the stirring component 5 is used to ensure that the oxygen-deficient zone can be fully denitrified.

[0104] In the above-mentioned device, the function of sludge return component 6 is to return the mixed liquor from the aerobic zone to the anaerobic zone at a flow rate of 86.4 mg / L. The function of mixed liquor return component 8 is to return the sludge returned from the sludge-water separation unit 3 to the starting section cell S7 of the aerobic zone at a flow rate of 34.6 mg / L.

[0105] The teaching experimental device of the present invention can adjust the position of the movable gate, the aeration volume, the stirring speed and the return flow rate, and combine them to construct activated sludge biological treatment processes for wastewater of different treatment scales and treatment methods. The experimental device has a clear principle, is integrated, and is easy to operate. It has good wastewater treatment effect and low cost, making it suitable for use in experimental teaching.

[0106] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of the present invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A teaching experimental device for wastewater treatment using the activated sludge process, characterized in that, The utility model relates to a sewage treatment device, including: Primary sedimentation and water distribution unit, active sludge partition biological reaction unit, aeration assembly, stirring assembly, mixed liquid reflux assembly, siphon drainage assembly, sludge-water separation unit and sludge reflux assembly, wherein, The primary sedimentation and water distribution unit is respectively provided with a wastewater inlet and a wastewater outlet, and the wastewater outlet is connected with the raw water inlet of the active sludge partition biological reaction unit through a pipeline provided with a water inlet pump; The active sludge partition biological reaction unit comprises a split-ring cylindrical structure pool body composed of a middle core channel, an inner annular channel and an outer annular channel, a plurality of fixed partitions are arranged in the inner annular channel and the outer annular channel, and the inner annular channel and the outer annular channel are divided into unit cells of different heights and different sizes; The aeration assembly is arranged in the inner annular channel and the outer annular channel of the active sludge partition biological reaction unit; The stirring assembly is arranged in the outer annular channel of the active sludge partition biological reaction unit; The mixed liquid reflux assembly is connected between the inner annular channel and the outer annular channel of the active sludge partition biological reaction unit; The sludge-water separation unit is arranged below the active sludge partition biological reaction unit and communicates with the middle core channel of the active sludge partition biological reaction unit; The siphon drainage assembly is connected between the inner annular channel of the active sludge partition biological reaction unit and the sludge-water separation unit; The sludge reflux assembly is connected between the sludge discharge port at the bottom of the sludge-water separation unit and the outer annular channel of the active sludge partition biological reaction unit; The total height of the split-ring cylindrical structure pool body of the active sludge partition biological reaction unit is 600 mm, wherein the outer diameter of the outer annular channel is 700 mm, the inner diameter is 500 mm, the outer diameter of the inner annular channel is 500 mm, and the inner diameter is 120 mm; the outer annular channel is divided into 8-10 unit cells by a plurality of movable partitions arranged therein, and the inner annular channel is divided into 6-10 unit cells by a plurality of movable partitions arranged therein; Water holes with a height of 10-30 mm and a width of 100-200 mm are formed in the inner annular wall between the outer annular channel and the inner annular channel at heights of 40 mm, 300 mm and 550 mm, so that the water flow in the outer annular channel and the inner annular channel is in an up-down folded return flow state.

2. The activated sludge process teaching apparatus according to claim 1, wherein Movable gates for controlling water flow are arranged at the water holes in the inner annular wall between the outer annular channel and the inner annular channel, and each movable gate is provided with an opening hole at the position corresponding to the water hole in the inner annular wall at a height of 300 mm, and the size of the opening hole is the same as that of the water hole.

3. The wastewater activated sludge process teaching experiment device according to any one of claims 1-2, characterized in that, The plurality of fixed partitions in the outer annular channel of the active sludge partition biological reaction unit comprises: A starting point outer partition and a plurality of outer ring partitions, wherein The starting point outer partition is a blind plate with a height of 550 mm and without water holes; Each outer ring partition is a partition with a plurality of water holes; The plurality of fixed partitions in the inner annular channel comprises: A starting point inner partition and a plurality of inner ring partitions, wherein The starting point inner partition is a blind plate with a height of 550 mm and without water holes; Each inner ring partition is a partition with a plurality of water holes.

4. The wastewater activated sludge process teaching experiment apparatus according to claim 3, characterized in that, Three water passing holes with a height of 10-30mm and a width of 50-100mm are formed on each outer ring partition plate at a height of 40mm, 300mm and 550mm respectively; Three water passing holes with a height of 10-30mm and a width of 100-200mm are formed on each inner ring partition plate at a height of 40mm, 300mm and 550mm respectively.

5. The wastewater activated sludge process teaching experiment apparatus according to claim 4, characterized in that, Each water passing hole on the outer ring partition plate and the inner ring partition plate is provided with a movable gate for controlling water passing, and each movable gate is provided with an opening hole at the position and with the same size as the water passing hole at the position of 300mm on the corresponding partition plate.

6. The wastewater activated sludge process teaching experiment device according to any one of claims 1-2, characterized in that, Further comprising: The box structure, the primary sedimentation water distribution unit, the activated sludge partitioned biological reaction unit, the aeration assembly, the stirring assembly, the mixed liquid reflux assembly, the siphon drainage assembly, the sludge-water separation unit and the sludge reflux assembly are all arranged in the box structure.

7. The activated sludge process teaching experiment device for wastewater treatment according to any one of claims 1 to 2, characterized in that, The sludge-water separation unit is in a cylindrical structure and is concentrically arranged with the activated sludge partitioned biological reaction unit.

8. The activated sludge process teaching experiment device for wastewater treatment according to any one of claims 1 to 2, characterized in that, The aeration assembly comprises a gas pump, two branch aeration pipes connected through a main aeration pipe, a gas flow meter arranged on each branch aeration pipe, and an aeration disc arranged at the end of each branch aeration pipe, wherein the aeration disc connected with one branch aeration pipe is arranged in the outer annular channel of the activated sludge partitioned biological reaction unit, and the aeration disc connected with the other branch aeration pipe is arranged in the inner annular channel of the activated sludge partitioned biological reaction unit; The stirring assembly is composed of a speed regulator connected with a motor, and the motor is connected with a stirring paddle; The mixed liquid reflux assembly comprises a mixed liquid reflux pipe provided with a mixed liquid reflux pump, and a mixed liquid flow meter arranged on the mixed liquid reflux pipe; The sludge reflux assembly comprises a sludge reflux pipe provided with a sludge reflux pump, and a sludge flow meter arranged on the sludge reflux pipe.

9. The wastewater activated sludge process teaching experiment device according to any one of claims 1-2, characterized in that, The siphon drainage assembly comprises at least one water level sensor, a controller, a vacuum pump, a reverse U-shaped drainage pipe switch controller, an upper opening type throat piece and a lower opening type throat piece, wherein Each water level sensor is arranged in the last tank of the activated sludge partitioned biological reaction unit and is arranged at the designed drainage water level; The reverse U-shaped drainage pipe is a pipeline composed of a single pipe connected in the middle of a reverse U-shaped pipe, one side of the pipeline of the reverse U-shaped pipe is used as a water inlet pipe and extends into the last tank of the activated sludge partitioned biological reaction unit, and the other side of the pipeline is used as a drainage pipe and extends into the sludge-water separation unit; The single pipe of the reverse U-shaped drainage pipe is provided with an upper opening type throat piece which can be opened upward and closed downward of the single pipe; The drainage pipe on one side of the reverse U-shaped drainage pipe is provided with a lower opening type throat piece which can be opened downward and closed upward of the drainage pipe, and the lower opening type throat piece is provided with a switch controller below; The vacuum pump is connected with the upper end of the single pipe of the reverse U-shaped drainage pipe; The controller is electrically connected with the water level sensor, the switch controller and the control end of the vacuum pump respectively, can control the opening of the vacuum pump according to the signal of the water level sensor, and control the closing of the vacuum pump according to the signal of the switch controller, so as to realize the siphon of the treated wastewater in the last tank of the active sludge partitioned biological reaction unit into the sludge-water separation unit by the inlet pipe and the outlet pipe of the inverted U-shaped drainage pipe.

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