Sewage aerobic treatment unit and sewage treatment system

Abstract

The utility model discloses a sewage aerobic treatment unit and sewage treatment system.The sewage aerobic treatment unit comprises an aeration tank, a mid-sedimentation tank, an air blower, a gas-liquid mixing spray head and a circulating pump, the gas-liquid mixing spray head is arranged in the aeration tank, and an air outlet of the air blower is communicated with an air inlet of the gas-liquid mixing spray head; a water outlet of the aeration tank is communicated with a water inlet of the mid-sedimentation tank, a water inlet of the circulating pump is communicated with the inside of the aeration tank, a water outlet of the circulating pump is communicated with a liquid inlet of the gas-liquid mixing spray head, a sludge outlet of the mid-sedimentation tank is communicated with the inside of the aeration tank through a slurry pump, and the slurry pump is used for sending sludge in the mid-sedimentation tank back into the aeration tank. The gas-liquid mixing nozzle is arranged at the bottom in the aeration tank, the gas inlet of the gas-liquid mixing nozzle is communicated with the air outlet of the air blower, the liquid inlet of the gas-liquid mixing nozzle is communicated with the water outlet of the circulating pump, and the circulating pump extracts sewage from the aeration tank, mixes the sewage through the gas-liquid mixing nozzle and sprays the sewage, so that the contact efficiency of air and the sewage can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment systems, and in particular relates to a sewage aerobic treatment unit and a sewage treatment system. Background Art

[0002] At present, when air is introduced into the aeration tank through a blower, the air is mostly introduced directly into the bottom of the aeration tank, which causes a large number of large bubbles to appear in the aeration tank and large waves on the water surface. Although it can achieve better contact between sewage and air to facilitate the activity of aerobic microorganisms, it has high power consumption requirements for the blower, indirectly increasing the operating cost, and the air utilization rate at the blower pump is low. Although document number CN116375181A "An Energy-Saving Aeration Tank Based on Precision Aeration" discloses a device that cooperates with a jet device and an aeration device to increase the contact rate between air and sewage in the aeration tank, its structure is relatively complicated. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a sewage aerobic treatment unit which has a simple structure and can fully aerate sewage and has high utilization efficiency of the air pumped out by the blower.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a sewage aerobic treatment unit, comprising an aeration tank, a middle sedimentation tank, a blower, a gas-liquid mixing nozzle and a circulation pump, wherein the gas-liquid mixing nozzle is placed in the aeration tank, the air outlet of the blower is connected with the air inlet of the gas-liquid mixing nozzle, the water outlet of the aeration tank is connected with the water inlet of the middle sedimentation tank, the water inlet of the circulation pump is connected with the inside of the aeration tank and a first valve is arranged at the connection point, the water outlet of the circulation pump is connected with the liquid inlet of the gas-liquid mixing nozzle, the sludge outlet of the middle sedimentation tank is connected with the inside of the aeration tank through a mud pump and a fifth valve is arranged at the connection point, and the mud pump is used to return the sludge in the middle sedimentation tank to the aeration tank.

[0005] The beneficial effect of the above technical solution is that: by arranging a gas-liquid mixing nozzle at the bottom of the aeration tank, the air inlet of the gas-liquid mixing nozzle is connected with the air outlet of the blower, and the liquid inlet of the gas-liquid mixing nozzle is connected with the water outlet of the circulation pump, and the circulation pump draws sewage from the aeration tank and mixes and sprays it through the gas-liquid mixing nozzle. At this time, the air flow and the water flow are fully mixed, and a large number of fine bubbles will eventually be formed in the aeration tank, which can improve the contact efficiency between air and sewage. Although rolling waves will appear on the water surface, the power requirement of the blower is reduced.

[0006] In the above technical solution, a plurality of gas-liquid mixing nozzles are provided, and the plurality of gas-liquid mixing nozzles are evenly distributed in the aeration tank.

[0007] The beneficial effect of the above technical solution is that the aeration effect at various locations in the aeration tank is relatively uniform, which is beneficial to improving the aerobic treatment effect.

[0008] In the above technical solution, a second valve is provided at the connection point between the water outlet of the circulation pump and the liquid inlet of each gas-liquid mixing nozzle.

[0009] The beneficial effect of the above technical solution is that the gas supply volume of each gas-liquid mixing nozzle can be adjusted according to needs.

[0010] The water outlet of the aeration tank in the above technical solution is also connected to the water inlet of at least one of the gas-liquid mixing nozzles.

[0011] The beneficial effect of the above technical solution is that part of the water discharged from the aeration tank outlet can be sprayed back into the aeration tank through the corresponding gas-liquid mixing nozzle, thereby further improving the aeration effect in the aeration tank.

[0012] The water inlet and sludge outlet of the intermediate settling tank described in the above technical solution are both located at the bottom of the tank.

[0013] The beneficial effects of the above technical solution are: its structure is simple, and water is introduced into the intermediate settling tank from the bottom at the water inlet to avoid sludge accumulation at the bottom of the intermediate settling tank.

[0014] The sludge outlet of the intermediate settling tank in the above technical solution is also connected to the slurry tank and the sludge thickening workshop. A third valve is provided at the connection between the sludge outlet of the intermediate settling tank and the slurry tank. A fourth valve is provided at the connection between the sludge outlet of the intermediate settling tank and the sludge thickening workshop. The filtrate of the sludge thickening workshop is connected to the aeration tank through a reflux pump.

[0015] The beneficial effect of the above technical solution is that the sludge discharged from the intermediate settling tank can be returned to the aeration tank for reuse, and can also be discharged to the slurry tank for reuse according to the nature of the sludge, or discharged to the sludge thickening workshop for drying treatment, and finally the filtrate of the dried sludge can be returned to the aeration tank for aeration treatment, thereby avoiding the generation of wastewater in the sludge thickening workshop to pollute the surrounding environment.

[0016] The second purpose of the utility model is to provide a sewage treatment system which has a simple structure and can fully treat factory sewage.

[0017] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a sewage treatment system, comprising an anaerobic tank, a concentration tank and the sewage aerobic treatment unit as described above, the water outlet of the anaerobic tank and the supernatant outlet of the concentration tank are both connected to the aeration tank, the anaerobic tank ditch is connected to the aeration tank through a lifting pump, and the lifting pump is used to pump the sewage in the anaerobic tank ditch into the aeration tank.

[0018] The beneficial effect of the above technical solution is that the wastewater in the anaerobic tank, anaerobic tank ditch and concentration tank can be discharged into the aeration tank for aeration treatment. In particular, sufficient aeration treatment of the wastewater in the anaerobic tank ditch can avoid rainwater flooding the ditch and polluting the environment.

[0019] The water outlet of the intermediate settling tank described in the above technical solution is connected with the Fenton tank and a sixth valve is arranged at the connection point.

[0020] The beneficial effect of the above technical solution is that the wastewater in the intermediate settling tank can be directly introduced into the Fenton tank for further treatment of COD after sedimentation treatment.

[0021] The water outlet of the intermediate settling tank described in the above technical solution is connected with the regulating tank and a seventh valve is arranged at the connection point.

[0022] The beneficial effect of the above technical solution is that the wastewater in the intermediate sedimentation tank can be returned to the regulating tank after sedimentation treatment to adjust the water quality.

[0023] The water outlet of the intermediate settling tank described in the above technical solution is connected with the acidification tank and an eighth valve is arranged at the connection point.

[0024] The beneficial effect of the above technical solution is that the wastewater in the intermediate sedimentation tank can be returned to the acidification tank after sedimentation treatment to adjust the water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the sewage aerobic treatment unit described in Example 1 of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the sewage treatment system described in Example 2 of the present utility model.

[0027] In the figure: 1 aeration tank; 2 intermediate sedimentation tank; 3 blower; 4 gas-liquid mixing nozzle; 5 circulation pump; 6 mud pump; 7 first valve; 8 fifth valve; 9 second valve; 10 slurry tank; 11 sludge thickening workshop; 12 third valve; 13 fourth valve; 14 return pump; 100 sewage aerobic treatment unit; 200 anaerobic tank; 210 anaerobic tank ditch; 300 thickening tank; 400 lifting pump; 500 Fenton tank; 510 sixth valve; 600 regulating tank; 610 seventh valve; 700 acidification tank; 710 eighth valve. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a sewage aerobic treatment unit, including an aeration tank 1, a middle sedimentation tank 2, a blower 3, a gas-liquid mixing nozzle 4 and a circulation pump 5, wherein the gas-liquid mixing nozzle 4 is placed in the aeration tank 1, the air outlet of the blower 3 is connected to the air inlet of the gas-liquid mixing nozzle 4, the water outlet of the aeration tank 1 is connected to the water inlet of the middle sedimentation tank 2, the water inlet of the circulation pump 5 is connected to the inside of the aeration tank 1 and a first valve 7 is provided at the connection point, the water outlet of the circulation pump 5 is connected to the liquid inlet of the gas-liquid mixing nozzle 4, and the sludge outlet of the middle sedimentation tank 2 is connected to the inside of the aeration tank 1 through a slurry pump 6. A fifth valve 8 is provided at the connection point. The mud pump 6 is used to return the sludge in the intermediate settling tank 2 to the aeration tank 1. A gas-liquid mixing nozzle is provided at the bottom of the aeration tank, and the air inlet of the gas-liquid mixing nozzle is connected with the air outlet of the blower, and the liquid inlet of the gas-liquid mixing nozzle is connected with the water outlet of the circulation pump. The circulation pump draws sewage from the aeration tank and mixes and sprays it through the gas-liquid mixing nozzle. At this time, the air flow and the water flow are fully mixed, and eventually a large number of fine bubbles will be formed in the aeration tank, which can improve the contact efficiency between air and sewage. Although rolling waves will appear on the water surface, the power requirement of the blower is reduced.

[0031] The gas-liquid mixing nozzle is an existing product, such as a Venturi mixing jet nozzle.

[0032] In the above technical solution, a plurality of gas-liquid mixing nozzles 4 are provided, and the plurality of gas-liquid mixing nozzles 4 are evenly distributed in the aeration tank 1, so that the aeration effect at various locations in the aeration tank is relatively uniform, which is beneficial to improving the aerobic treatment effect.

[0033] The gas-liquid mixing nozzle can be determined according to the area of ​​the aeration tank. For example, at least one nozzle can be set per square meter at the bottom of the tank. The nozzle of the gas-liquid mixing nozzle can be downward, so that the jet can be more dispersed after colliding with the bottom of the tank, and the deposited sludge at the bottom of the tank can be impacted to boil in the sewage, so that the aerobic microorganisms can have a better treatment effect on the sewage.

[0034] In the above technical solution, a second valve 9 is provided at the connection point between the water outlet of the circulation pump 5 and the liquid inlet of each gas-liquid mixing nozzle 4, so that the gas supply volume of each gas-liquid mixing nozzle can be adjusted as needed.

[0035] The water outlet of the aeration tank 1 in the above technical solution is also connected to the water inlet of at least one of the gas-liquid mixing nozzles 4, so that part of the water discharged from the water outlet of the aeration tank can be sprayed back into the aeration tank through the corresponding gas-liquid mixing nozzle, thereby further improving the aeration effect in the aeration tank.

[0036] The water inlet and sludge outlet of the intermediate settling tank 2 described in the above technical solution are both located at the bottom of the tank, which has a simple structure and allows water to enter the intermediate settling tank from the bottom at the water inlet to avoid sludge accumulation at the bottom of the intermediate settling tank.

[0037] The sludge outlet of the intermediate settling tank 2 in the above technical solution is also connected with the slurry tank 10 and the sludge thickening workshop 11. A third valve 12 is provided at the connection between the sludge outlet of the intermediate settling tank 2 and the slurry tank 10. A fourth valve 13 is provided at the connection between the sludge outlet of the intermediate settling tank 2 and the sludge thickening workshop 11. The filtrate of the sludge thickening workshop 11 is connected with the aeration tank 1 through a reflux pump 14. In this way, the sludge discharged from the intermediate settling tank can be returned to the aeration tank for reuse. In addition, the sludge can be discharged to the slurry tank for reuse according to the nature of the sludge, and discharged to the sludge thickening workshop for drying treatment. Finally, the filtrate of the dried sludge is continued to flow back to the aeration tank for aeration treatment, so as to avoid the generation of wastewater in the sludge thickening workshop to pollute the surrounding environment. The sludge thickening workshop mainly adopts a plate and frame filter press to dry the sludge, and the generated filtrate is returned to the aeration tank.

[0038] Example 2

[0039] like Figure 2 As shown, this embodiment provides a sewage treatment system, including an anaerobic tank 200, a concentrating tank 300 and a sewage aerobic treatment unit 100 as described in Example 1, the outlet of the anaerobic tank 100 and the supernatant outlet of the concentrating tank 300 are both connected to the aeration tank 1, and the anaerobic tank ditch 210 is connected to the aeration tank 1 through a lifting pump 400, and the lifting pump 400 is used to pump the sewage in the anaerobic tank ditch 210 into the aeration tank 1, so that the wastewater in the anaerobic tank, the anaerobic tank ditch and the concentrating tank can be discharged into the aeration tank for aeration treatment, especially the wastewater in the anaerobic tank ditch is fully aerated to avoid rainwater overflowing the ditch and polluting the environment.

[0040] The outlet of the intermediate settling tank 2 described in the above technical solution is connected to the Fenton tank 500 and a sixth valve 510 is provided at the connection point, so that the wastewater in the intermediate settling tank can be directly introduced into the Fenton tank after sedimentation treatment for further treatment of COD (mainly the COD that is more difficult to treat is finally treated in the Fenton tank).

[0041] The outlet of the intermediate settling tank 2 described in the above technical solution is connected to the regulating tank 600 and a seventh valve 610 is provided at the connection point, so that the wastewater in the intermediate settling tank can be returned to the regulating tank after sedimentation treatment to adjust the water quality.

[0042] The outlet of the intermediate settling tank 2 in the above technical solution is connected to the acidification tank 700 and an eighth valve 710 is provided at the connection point, so that the wastewater in the intermediate settling tank can be returned to the acidification tank after sedimentation treatment to adjust the water quality.

[0043] The sewage in the intermediate settling tank is returned to the regulating tank mainly when the index of the sewage sent into the regulating tank exceeds the set index. At this time, in order to make the water quality treated in each section meet the standard, the sewage in the intermediate settling tank can be returned to the regulating tank to dilute the sewage in the regulating tank, so that the index of the sewage in the regulating tank can be adjusted; and if the water inflow index in the regulating tank exceeds the standard and the water inflow is large, at this time, if the sewage in the intermediate settling tank is returned to the regulating tank, the return amount is limited, so the dilution effect on the sewage in the regulating tank is limited. At this time, the sewage in the intermediate settling tank can be directly returned to the acidification tank, so as to dilute the sewage in the acidification tank (since the volume of the acidification tank is smaller than that of the regulating tank, when the water inflow in the regulating tank is large, the sewage in the first intermediate tank is returned to the acidification tank, so as to avoid the return water occupying the storage capacity of the regulating tank).

[0044] It should be noted that the above detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0047] Also, when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0048] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0049] For ease of description, spatially relative terms such as "on", "above", "on the upper surface", "upper", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figures. It should be understood that the spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures.

[0050] For example, if a device in a drawing is inverted, a device described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can encompass both "above" and "below." The device may also be oriented in other different ways (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0051] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A sewage aerobic treatment unit, characterized in that: The invention comprises an aeration tank (1), a middle sedimentation tank (2), a blower (3), a gas-liquid mixing nozzle (4) and a circulation pump (5), wherein the gas-liquid mixing nozzle (4) is placed in the aeration tank (1), the air outlet of the blower (3) is connected to the air inlet of the gas-liquid mixing nozzle (4), the water outlet of the aeration tank (1) is connected to the water inlet of the middle sedimentation tank (2), the water inlet of the circulation pump (5) is connected to the inside of the aeration tank (1) and a first valve (7) is arranged at the connection point, the water outlet of the circulation pump (5) is connected to the liquid inlet of the gas-liquid mixing nozzle (4), the sludge outlet of the middle sedimentation tank (2) is connected to the inside of the aeration tank (1) through a sludge pump (6) and a fifth valve (8) is arranged at the connection point, and the sludge pump (6) is used to return the sludge in the middle sedimentation tank (2) to the aeration tank (1).

2. The sewage aerobic treatment unit according to claim 1, characterized in that: A plurality of the gas-liquid mixing nozzles (4) are provided, and the plurality of the gas-liquid mixing nozzles (4) are evenly distributed in the aeration tank (1).

3. The sewage aerobic treatment unit according to claim 2, characterized in that: A second valve (9) is provided at the connection point between the water outlet of the circulation pump (5) and the liquid inlet of each of the gas-liquid mixing nozzles (4).

4. The sewage aerobic treatment unit according to claim 3, characterized in that: The water outlet of the aeration tank (1) is also connected to the water inlet of at least one of the gas-liquid mixing nozzles (4).

5. The sewage aerobic treatment unit according to claim 1, characterized in that: The water inlet and sludge outlet of the intermediate settling tank (2) are both located at the bottom of the tank.

6. The sewage aerobic treatment unit according to claim 1, characterized in that: The sludge outlet of the intermediate settling tank (2) is also connected to the slurry tank (10) and the sludge thickening workshop (11); a third valve (12) is provided at the connection point between the sludge outlet of the intermediate settling tank (2) and the slurry tank (10); a fourth valve (13) is provided at the connection point between the sludge outlet of the intermediate settling tank (2) and the sludge thickening workshop (11); and the filtrate of the sludge thickening workshop (11) is connected to the aeration tank (1) via a reflux pump (14).

7. A sewage treatment system, characterized in that: The invention comprises an anaerobic tank (200), a concentrating tank (300) and a sewage aerobic treatment unit (100) according to any one of claims 1 to 6, wherein the outlet of the anaerobic tank (200) and the supernatant outlet of the concentrating tank (300) are both connected to the interior of the aeration tank (1), and the anaerobic tank ditch (210) is connected to the interior of the aeration tank (1) via a lifting pump (400), and the lifting pump (400) is used to pump the sewage in the anaerobic tank ditch (210) into the aeration tank (1).

8. The sewage treatment system according to claim 7, characterized in that: The water outlet of the intermediate settling tank (2) is connected to the Fenton tank (500) and a sixth valve (510) is provided at the connection point.

9. The sewage treatment system according to claim 8, characterized in that: The water outlet of the intermediate settling tank (2) is connected to the regulating tank (600) and a seventh valve (610) is provided at the connection point.

10. The sewage treatment system according to claim 8, characterized in that: The water outlet of the intermediate settling tank (2) is connected to the acidification tank (700) and an eighth valve (710) is provided at the connection point.

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