A wastewater treatment system

Abstract

This utility model relates to a wastewater treatment system, including a base layer and a treatment cylinder installed on the base layer. The treatment cylinder includes an inner cylinder and an outer cylinder fitted outside the inner cylinder. The treatment space between the inner and outer cylinders is divided into at least one wastewater treatment process zone. The internal space of the inner cylinder is divided into an isolated air purification chamber, a sludge chamber, and a greywater chamber. An air purification device is installed in the air purification chamber, which is equipped with a polluted gas inlet and a purified gas outlet. At least one wastewater treatment device is installed on the base layer, and / or at least one process platform is built above the base layer, with at least one wastewater treatment device installed on the process platform. The upper gas layer of each wastewater treatment process zone and the polluted gas outlet of each wastewater treatment device are all connected to the polluted gas inlet. The system has a compact structure and can effectively collect and purify the polluted gases generated during wastewater treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system. Background Technology

[0002] In traditional wastewater treatment systems, to achieve a multi-stage process of "pretreatment + biological treatment + advanced treatment," multiple independent tanks need to be constructed on the ground, including primary sedimentation tanks, aeration tanks, secondary sedimentation tanks, and disinfection tanks. This results in a large land area for the wastewater treatment system, and the wastewater treatment facilities for each process stage are scattered, making it difficult to collect pollutants. When pollutants escape into the air, they have several adverse effects: 1. Pollutants contain toxic and harmful substances such as hydrogen sulfide, ammonia, and volatile organic compounds. Long-term exposure may cause respiratory diseases, headaches, and nausea, threatening the health of factory workers and nearby residents. 2. Pollutants can trigger photochemical reactions to generate ozone or PM2.5, exacerbating air pollution. 3. Severe odors significantly impact the quality of life for nearby residents.

[0003] Chinese patent CN115893667B discloses a wastewater treatment system, such as... Figure 1 As shown, the wastewater treatment system includes a foundation layer located below the ground surface and a treatment cylinder installed on the foundation layer. The treatment cylinder includes an inner cylinder 1 and an outer cylinder 2 coaxially fitted together. The treatment space formed between the inner cylinder 1 and the outer cylinder 2 is evenly divided into multiple fan-shaped zones. These fan-shaped zones are further divided into sequentially adjacent anaerobic, anoxic, and aerobic zones. The anaerobic and anoxic zones are connected, as are the anoxic and aerobic zones. Adjacent fan-shaped zones within the anaerobic, anoxic, and aerobic zones are sequentially connected, allowing the wastewater in the treatment cylinder to flow sequentially through each fan-shaped zone along a vertical serpentine path, thereby sequentially flowing through the anaerobic, anoxic, and aerobic zones. At least two layers of process platforms, arranged sequentially from top to bottom, are constructed around the treatment cylinder above the foundation layer. These include a first process platform 3 and a second process platform 4 located below the first process platform 3. Secondary sedimentation equipment is installed on the first process platform 3, and advanced treatment equipment is installed on the second process platform 4. A solid-liquid separation device, a central pressurization pump station, a sludge dewatering machine, a baling machine, and an emergency sewage discharge device are installed on the foundation layer. The inner cylinder 1 is divided into three enclosed areas arranged sequentially from top to bottom, serving as a fire water chamber, a greywater chamber, and a sludge chamber, respectively.

[0004] The solid-liquid separation device performs coarse filtration on the sewage entering the central booster pump station. The central booster pump station sends the coarsely filtered sewage into the anaerobic zone from the top of the treatment cylinder. The secondary sedimentation equipment is connected to the sewage outlet of the treatment cylinder (i.e., the sewage outlet of the aerobic zone). The advanced treatment equipment is connected to the clear water outlet of the secondary sedimentation equipment. The outlet of the advanced treatment equipment is connected to the greywater chamber. The sludge outlet of the secondary sedimentation equipment is connected to the sludge chamber. The sludge dewatering machine is used to dewater the sludge in the sludge chamber. The baling machine is used to bale the dewatered sludge into sludge bricks.

[0005] The aforementioned wastewater treatment system adopts a three-dimensional building form, which reduces the construction land area and centralizes the layout of wastewater treatment facilities for each process stage. Based on this, there is an urgent need to provide a solution for collecting pollutant gases from the wastewater treatment system. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a wastewater treatment system with a compact structure that can effectively collect and purify polluting gases generated during wastewater treatment.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0010] This utility model provides a wastewater treatment system, including a base layer and a treatment cylinder installed on the base layer. The treatment cylinder includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder. The treatment space between the inner cylinder and the outer cylinder is divided into at least one wastewater treatment process area. The internal space of the inner cylinder is divided into an air purification chamber, a sludge chamber and a greywater chamber that are isolated from each other. An air purification device is installed in the air purification chamber, and the air purification chamber is provided with a polluted gas inlet and a purified gas outlet.

[0011] At least one wastewater treatment device is installed on the foundation layer, and / or at least one process platform is built above the foundation layer, on which at least one wastewater treatment device is installed; the upper gas layer of each wastewater treatment process area and the polluted gas outlet of each wastewater treatment device are connected to the polluted gas inlet.

[0012] Optionally, the treatment space between the inner and outer cylinders is divided into an anaerobic tank, an anoxic tank, and an aerobic tank. The treatment spaces of the anaerobic tank, anoxic tank, and aerobic tank all extend upwards to the top plate of the treatment cylinder and downwards to the bottom plate of the treatment cylinder. The wastewater treatment process zones and wastewater treatment equipment are connected according to the wastewater treatment process. The anaerobic tank is connected to the anoxic tank, and the anoxic tank is connected to the aerobic tank. The wastewater in the treatment cylinder flows through the anaerobic tank, anoxic tank, and aerobic tank in sequence along a serpentine path that alternates between vertical and horizontal directions.

[0013] Optionally, the anaerobic tank is divided into at least one sub-zone that extends upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder; the anoxic tank is divided into at least one sub-zone that extends upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder; and the aerobic tank is divided into at least one sub-zone that extends upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder. The sub-zones are interconnected, so that the wastewater in the treatment cylinder flows through each sub-zone sequentially along a serpentine path that alternates between vertical and horizontal directions, and the wastewater in the treatment cylinder flows through the anaerobic tank, the anoxic tank, and the aerobic tank sequentially.

[0014] Optionally, the treatment space between the inner and outer cylinders is further divided into an anaerobic tank. The treatment space of the anaerobic tank extends upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder. The aerobic tank is connected to the anaerobic tank. The sewage in the treatment cylinder flows through the anaerobic tank, anoxic tank, aerobic tank and anaerobic tank in sequence along a serpentine path that alternates between the upper and lower directions.

[0015] Optionally, the treatment space between the inner and outer cylinders is divided into an acidification tank, a neutralization tank, and a Fenton oxidation tank. The treatment spaces of the acidification tank, neutralization tank, and Fenton oxidation tank all extend upwards to the top plate of the treatment cylinder and downwards to the bottom plate of the treatment cylinder. The wastewater treatment process areas and wastewater treatment equipment are connected according to the wastewater treatment process.

[0016] Optionally, the internal space of the inner cylinder is divided into an air purification chamber, a sludge chamber, and a greywater chamber arranged along the axial direction of the inner cylinder and isolated from each other, with the air purification chamber located above the sludge chamber and the greywater chamber.

[0017] Optionally, the wastewater treatment equipment includes sludge-water separation equipment, advanced treatment equipment, and sludge dewatering machine. The inlet of the sludge-water separation equipment is connected to the wastewater outlet of the treatment cylinder, the inlet of the advanced treatment equipment is connected to the clear water outlet of the secondary sedimentation equipment, the outlet of the advanced treatment equipment is connected to the inlet of the greywater chamber, the sludge outlet of the secondary sedimentation equipment is connected to the sludge inlet of the sludge chamber, and the sludge outlet of the sludge chamber is connected to the inlet of the sludge dewatering machine. The polluted gas outlets of the sludge-water separation equipment, the advanced treatment equipment, and the sludge dewatering machine are all connected to the polluted gas inlet.

[0018] Optionally, the air purification device includes a biological filter and an activated carbon adsorption unit connected sequentially along the direction of the polluted gas flow. The polluted gas inlet includes a first polluted gas inlet for supplying polluted gas to the biological filter and a second polluted gas inlet for supplying polluted gas to the activated carbon adsorption unit. The upper gas layer of the anaerobic tank, the upper gas layer of the anoxic tank, the upper gas layer of the sludge chamber, and the polluted gas outlet of the sludge dewatering machine are all connected to the first polluted gas inlet. The upper gas layer of the aerobic tank, the polluted gas outlet of the sludge-water separation equipment, and the polluted gas outlet of the deep treatment equipment are all connected to the second polluted gas inlet.

[0019] Optionally, the treatment space between the inner and outer cylinders is further divided into an anoxic tank, and the upper gas layer of the anoxic tank is connected to the second pollutant gas inlet.

[0020] Optionally, the wastewater treatment equipment also includes interconnected solid-liquid separation devices, which are used to perform coarse filtration on the wastewater entering the treatment cylinder, and the polluted gas outlet of the solid-liquid separation device is connected to the first polluted gas inlet.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are:

[0023] The wastewater treatment system provided by this utility model includes a wastewater treatment process area set up in the treatment cylinder, which has a centralized layout. Other wastewater treatment equipment is installed on the foundation layer and / or process platform, which also has the advantage of centralized layout. By setting up an air purification chamber and air purification device in the inner cylinder of the treatment cylinder, on the one hand, the inner cylinder space is used to arrange the air purification device, making full use of the inner cylinder space and making the overall structure of the wastewater treatment system more compact. On the other hand, the location advantage of the inner cylinder in the middle of the wastewater treatment system and the elevation effect of the inner cylinder are utilized to facilitate the delivery of polluted gas from the treatment cylinder and each wastewater treatment equipment to the air purification device. The required gas delivery pipeline length is small and the cost is low. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a wastewater treatment system according to the background technology of this utility model;

[0025] Figure 2 This is a cross-sectional schematic diagram of the processing cylinder according to Embodiment 1 of the present invention;

[0026] Figure 3 This is a top view of the processing cylinder according to Embodiment 1 of the present invention.

[0027] Explanation of reference numerals in the attached figures

[0028] 1: Inner cylinder;

[0029] 11: Air purification chamber; 12: Sludge chamber; 13: Greywater chamber;

[0030] 111: Polluted gas inlet; 112: Purified gas outlet; 113: Horizontal base plate;

[0031] 121: Conical bottom plate; 122: Sludge inlet; 123: Sludge outlet; 124: First vent; 125: First polluted gas outlet;

[0032] 131: Water inlet; 132: Water outlet; 133: Second vent; 134: Second polluted gas outlet;

[0033] 2: Outer cylinder;

[0034] 21: Anaerobic tank; 22: Anoxic tank; 23: Aerobic tank; 24: Anoxic tank; 25: Treatment tank inlet; 26: Treatment tank outlet; 27: Operating liquid level;

[0035] 3: First process platform;

[0036] 4: Second process platform. Detailed Implementation

[0037] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. The directional terms such as "upper" and "lower" used herein refer to... Figure 2 The orientation shall prevail.

[0038] Example 1

[0039] like Figure 2 As shown, this embodiment provides a treatment cylinder for wastewater treatment. The treatment cylinder includes an inner cylinder 1 and an outer cylinder coaxially sleeved together. The treatment space between the inner cylinder 1 and the outer cylinder 2 is divided into an anaerobic tank 21, an anoxic tank 22, and an aerobic tank 23 arranged sequentially around the inner cylinder 1 and along its circumference. The internal space of the inner cylinder 1 is divided into an air purification chamber 11, a sludge chamber 12, and a greywater chamber 13 arranged sequentially along the axial direction of the inner cylinder 1. The air purification chamber 11, the sludge chamber 12, and the greywater chamber 13 are isolated from each other. The air purification chamber 11 is located in... Above the sludge chamber 12 and the greywater chamber 13, an air purification device is installed in the air purification chamber 11. The side wall of the air purification chamber 11 is provided with a polluted gas inlet 111 for supplying polluted gas to the air purification device and a purified gas outlet 112 for supplying purified gas to the outside. The polluted gas inlet 111 is connected to the upper gas layer of the anaerobic tank 21, the upper gas layer of the anoxic tank 22, the upper gas layer of the aerobic tank 23, and the upper gas layer of the sludge chamber 12.

[0040] This treatment cylinder design leverages the concentrated layout of the anaerobic tank 21, anoxic tank 22, aerobic tank 23, and sludge chamber 12. By incorporating an air purification chamber 11 and an air purification device, it collects and treats the polluting gases generated in these tanks, achieving purification of the polluting gases within the treatment cylinder. By creating an air purification chamber 11 at the top of the inner cylinder 1 to house the air purification device, it utilizes the space within the inner cylinder 1, making full use of the space and contributing to a more compact overall structure. Furthermore, it takes advantage of the inner cylinder 1's central location within the wastewater treatment system and its elevation, facilitating the delivery of polluting gases from various wastewater treatment facilities to the air purification device, requiring shorter gas delivery pipelines and reducing costs.

[0041] Optionally, the processing space between the inner cylinder 1 and the outer cylinder 2 is divided into an anaerobic tank 21, an anoxic tank 22, and an aerobic tank 23 arranged radially around the inner cylinder 1. In this way, the anaerobic tank 21, the anoxic tank 22, and the aerobic tank 23 can still be centrally arranged without affecting their individual functions.

[0042] It should be noted that the sequential arrangement of anaerobic tank 21, anoxic tank 22, and aerobic tank 23 is merely a preferred arrangement. It is conceivable that similar effects could be achieved by arranging anaerobic tank 21, anoxic tank 22, and aerobic tank 23 in other orders.

[0043] Preferably, the air purification device includes a biological filter and an activated carbon adsorption unit connected sequentially along the direction of the polluted gas flow. The polluted gas inlet 111 includes a first polluted gas inlet for supplying polluted gas to the biological filter and a second polluted gas inlet 111 for supplying polluted gas to the activated carbon adsorption unit. The first polluted gas inlet is connected to the upper gas layer of the anaerobic tank 21, the upper gas layer of the anoxic tank 22, and the upper gas layer of the sludge chamber 12. The second polluted gas inlet 111 is connected to the upper gas layer of the aerobic tank 23. Because the pollutants generated from the anaerobic tank 21, anoxic tank 22, and sludge chamber 12 have high concentrations (e.g., H2S > 100 ppm) and complex compositions (containing sulfur-containing organic matter, halogenated hydrocarbons, benzene compounds, and other recalcitrant VOCs), they require sequential treatment in the air purification device through both biological filtration and activated carbon adsorption. Therefore, the first pollutant gas inlet is connected to the upper gas layer of the anaerobic tank 21, the upper gas layer of the anoxic tank 22, and the upper gas layer of the sludge chamber 12. Conversely, because the pollutants generated from the aerobic tank 23 have lower concentrations (e.g., H2S < 50 ppm) and simpler compositions (mainly inorganic substances such as hydrogen sulfide and ammonia), they only require activated carbon adsorption in the air purification device. Therefore, the second pollutant gas inlet 111 is connected to the upper gas layer of the aerobic tank 23. This allows for the categorized treatment of pollutants within the treatment chamber, improving the overall purification efficiency.

[0044] Preferably, such as Figure 3 As shown, the treatment space between the inner cylinder 1 and the outer cylinder 2 is divided into an anaerobic tank 21, an anoxic tank 22, an aerobic tank 23 and an anaerobic tank 24 arranged in sequence around the inner cylinder 1. The second pollutant gas inlet 111 is connected to the upper gas layer of the anaerobic tank 24.

[0045] More preferably, the treatment space formed between the inner cylinder 1 and the outer cylinder is divided into multiple fan-shaped zones, i.e., sub-zones. These fan-shaped zones are further divided into sequentially adjacent anaerobic tanks 21, anoxic tanks 22, aerobic tanks 23, and facultative tanks 24. Anaerobic tanks 21 and anoxic tanks 22 are connected, anoxic tanks 22 and aerobic tanks 23 are connected, and aerobic tanks 23 and facultative tanks 24 are connected. Adjacent fan-shaped zones within anaerobic tanks 21, anoxic tanks 22, aerobic tanks 23, and facultative tanks 24 are sequentially connected, allowing the wastewater in the treatment cylinder to flow sequentially through each fan-shaped zone along a vertical serpentine path, thereby sequentially flowing through anaerobic tanks 21, anoxic tanks 22, aerobic tanks 23, and facultative tanks 24.

[0046] Specifically, in this embodiment, the treatment space formed between the inner cylinder 1 and the outer cylinder is evenly divided into 8 fan-shaped zones. These 8 fan-shaped zones are further divided into sequentially adjacent anaerobic tank 21, anoxic tank 22, aerobic tank 23, and facultative tank 24. Anaerobic tank 21 occupies 1 fan-shaped zone, anoxic tank 22 occupies 2 fan-shaped zones, aerobic tank 23 occupies 4 fan-shaped zones, and facultative tank 24 occupies 1 fan-shaped zone. Anaerobic tank 21 and anoxic tank 22 are connected, anoxic tank 22 and aerobic tank 23 are connected, and aerobic tank 23 and facultative tank 24 are connected. Adjacent fan-shaped zones within anoxic tank 22 are sequentially connected, and adjacent fan-shaped zones within aerobic tank 23 are sequentially connected. This allows the wastewater in the treatment cylinder to flow sequentially through each fan-shaped zone along a vertical serpentine path, thereby sequentially flowing through anaerobic tank 21, anoxic tank 22, aerobic tank 23, and facultative tank 24.

[0047] Furthermore, in this embodiment, the top of the treatment cylinder is sealed by a top plate, and there is a space between the operating liquid level 27 of the sewage in the anaerobic tank 21, anoxic tank 22, aerobic tank 23 and facultative tank 24 and the top plate to form an upper gas layer for collecting pollutant gases and preventing pollutant gases from being directly discharged into the atmosphere without treatment.

[0048] Specifically, in this embodiment, the air purification chamber 11 is separated from the sludge chamber 12 by a horizontal base plate 113.

[0049] Preferably, the sludge chamber 12 is separated from the greywater chamber 13 by a conical bottom plate 121, and a sludge outlet 123 for communicating with the sludge outlet pipe is provided at the tip of the conical bottom plate 121. In this way, the conical bottom plate 121 facilitates the sludge to slide down and be discharged through the sludge outlet bend, and the sludge can be compressed during the process of sliding down into and out of the sludge outlet bend.

[0050] More preferably, the conical base plate 121 is conical in shape. Optionally, the conical base plate 121 is pyramidal in shape.

[0051] Preferably, the upper part of the sludge chamber 12 is provided with a sludge inlet 122, a first vent 124, and a first polluted gas outlet 125. The first vent 124 is used to communicate with the upper gas layer of the anaerobic tank 21, the upper gas layer of the anoxic tank 22, the upper gas layer of the aerobic tank 23, or the upper gas layer of the facultative tank 24 through a vent pipe. The first vent 124 is higher than the sludge inlet 122, and the first polluted gas outlet 125 is higher than the first vent 124. The first polluted gas outlet 125 is connected to the first polluted gas inlet. In this way, when the sewage treatment system is in an abnormal operating state, if too much sludge accumulates in the sludge chamber 12, the first vent 124 can play a protective role by discharging the excess sludge, and the first polluted gas outlet 125 can collect the polluted gas in the sludge chamber 12 and transport it to the air purification device.

[0052] Preferably, the second pollutant gas inlet 111 is connected to the upper gas layer of the medium water tank.

[0053] More preferably, the upper part of the greywater chamber 13 is provided with an inlet 131, a second vent 133, and a second polluted gas outlet 134. The second vent 133 is used to communicate with the upper gas layer of the anaerobic tank 21, the upper gas layer of the anoxic tank 22, the upper gas layer of the aerobic tank 23, or the upper gas layer of the facultative tank 24 through a vent pipe. The second vent 133 is higher than the inlet 131, and the second polluted gas outlet 134 is higher than the second vent 133. The second polluted gas outlet 134 is connected to the second polluted gas inlet 111. In this way, when the sewage treatment system is in an abnormal operating state, if too much greywater accumulates in the greywater chamber 13, the second vent 133 can play a protective role by discharging the excess greywater, and the second polluted gas outlet 134 can collect the polluted gas in the greywater chamber 13 and transport it to the air purification device.

[0054] Specifically, in this embodiment, the lower part of the greywater chamber 13 is also provided with a water outlet 132 for discharging greywater to the outside.

[0055] Example 2

[0056] Based on the treatment cylinder proposed in Example 1, this embodiment proposes a wastewater treatment system. This system includes a foundation layer located below the ground surface and a treatment cylinder as described in Example 1, installed on the foundation layer. At least two layers of process platforms are constructed above the foundation layer, arranged sequentially from top to bottom around the treatment cylinder. These include a first process platform and a second process platform located below the first process platform. Secondary sedimentation equipment is installed on the first process platform, and advanced treatment equipment is installed on the second process platform. A sludge dewatering machine is installed on the foundation layer. The inlet of the secondary sedimentation equipment is connected to the outlet 26 of the treatment cylinder. The inlet of the advanced treatment equipment is connected to the clear water outlet of the secondary sedimentation equipment, and the outlet of the advanced treatment equipment is connected to the inlet of the greywater chamber. The sludge outlet of the secondary sedimentation equipment is connected to the sludge inlet of the sludge chamber, and the sludge outlet of the sludge chamber is connected to the inlet of the sludge dewatering machine. The polluted gas outlets of the secondary sedimentation equipment, the advanced treatment equipment, and the sludge dewatering machine are all connected to the polluted gas inlet.

[0057] This wastewater treatment system takes advantage of the centralized layout of wastewater treatment facilities in each process stage, and realizes the collection and treatment of polluting gases generated in the secondary sedimentation equipment, advanced treatment equipment and sludge dewatering machine, thereby achieving the purification of polluting gases in the wastewater treatment system.

[0058] Furthermore, the polluted gas outlets of the secondary sedimentation equipment and the advanced treatment equipment are both connected to the second polluted gas inlet, while the polluted gas outlet of the sludge dewatering machine is connected to the first polluted gas inlet.

[0059] Preferably, a solid-liquid separation device and a central pressurization pump station are also installed on the base layer. The solid-liquid separation device is used to coarsely filter the sewage entering the central pressurization pump station. The central pressurization pump station is used to send the coarsely filtered sewage from the top of the treatment cylinder through the treatment cylinder inlet 25 into the anaerobic tank 21. The polluted gas outlet of the solid-liquid separation device is connected to the polluted gas inlet.

[0060] Furthermore, the polluted gas outlet of the solid-liquid separation device is connected to the first polluted gas inlet.

[0061] Furthermore, the sludge inlet of the sludge chamber in the treatment cylinder is located below the first process platform, and the water inlet of the greywater chamber in the treatment cylinder is located below the second process platform. This facilitates the use of gravity due to the elevation difference to transport sludge generated by the secondary sedimentation equipment to the sludge chamber, and also facilitates the use of gravity due to the elevation difference to transport greywater generated by the advanced treatment equipment to the greywater chamber.

[0062] Example 3

[0063] The main difference between this embodiment and Embodiment 2 is:

[0064] The treatment space between the inner cylinder 1 and the outer cylinder 2 is further divided into an acidification tank, a neutralization tank, and a Fenton oxidation tank. The treatment spaces of the acidification tank, neutralization tank, and Fenton oxidation tank all extend upwards to the top plate of the treatment cylinder and downwards to the bottom plate of the treatment cylinder. The acidification tank, neutralization tank, Fenton oxidation tank, anaerobic tank 21, anoxic tank 22, aerobic tank 23, facultative tank 24, and various wastewater treatment equipment are connected according to the wastewater treatment process.

[0065] The remaining contents are the same as in Example 1, and will not be repeated here.

[0066] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0068] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sewage treatment system characterised in that, The system includes a base layer and a treatment cylinder installed on the base layer. The treatment cylinder includes an inner cylinder (1) and an outer cylinder (2) fitted outside the inner cylinder. The treatment space between the inner cylinder (1) and the outer cylinder (2) is divided into at least one wastewater treatment process area. The internal space of the inner cylinder (1) is divided into an air purification chamber (11), a sludge chamber (12), and a greywater chamber (13) that are isolated from each other. An air purification device is installed in the air purification chamber (11). The air purification chamber (11) is provided with a polluted gas inlet (111) and a purified gas outlet (112). At least one wastewater treatment device is installed on the foundation layer, and / or at least one process platform is built above the foundation layer, on which at least one wastewater treatment device is installed; the upper gas layer of each wastewater treatment process area and the polluted gas outlet of each wastewater treatment device are connected to the polluted gas inlet (111).

2. The wastewater treatment system according to claim 1, characterized in that, The treatment space between the inner cylinder (1) and the outer cylinder (2) is divided into an anaerobic tank (21), an anoxic tank (22) and an aerobic tank (23). The treatment spaces of the anaerobic tank (21), the anoxic tank (22) and the aerobic tank (23) all extend upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder. According to the sewage treatment process, the sewage treatment process areas and sewage treatment equipment are connected. The anaerobic tank (21) is connected to the anoxic tank (22), and the anoxic tank (22) is connected to the aerobic tank (23). The sewage in the treatment tank flows through the anaerobic tank (21), the anoxic tank (22) and the aerobic tank (23) along a serpentine path that changes alternately in the up and down direction.

3. The wastewater treatment system according to claim 2, characterized in that, The anaerobic tank (21) is divided into at least one sub-zone that leads upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder; the anoxic tank (22) is divided into at least one sub-zone that leads upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder; and the aerobic tank (23) is divided into at least one sub-zone that leads upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder. The sub-zones are connected so that the wastewater in the treatment tank flows through each sub-zone along a serpentine path that alternates between the vertical and horizontal directions, and the wastewater in the treatment tank flows through the anaerobic tank (21), the anoxic tank (22), and the aerobic tank (23).

4. The wastewater treatment system according to claim 2 or 3, characterized in that, The treatment space between the inner cylinder (1) and the outer cylinder (2) is further divided into an anaerobic tank (24). The treatment space of the anaerobic tank (24) extends upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder. The aerobic tank (23) is connected to the anaerobic tank (24). The sewage in the treatment cylinder flows through the anaerobic tank (21), the anoxic tank (22), the aerobic tank (23), and the anaerobic tank (24) along a serpentine path that alternates between the upper and lower directions.

5. The wastewater treatment system according to any one of claims 1 to 3, characterized in that, The treatment space between the inner cylinder (1) and the outer cylinder (2) is divided into an acidification tank, a neutralization tank and a Fenton oxidation tank. The treatment spaces of the acidification tank, the neutralization tank and the Fenton oxidation tank all extend upward to the top plate of the treatment cylinder and downward to the bottom plate of the treatment cylinder. The wastewater treatment process areas and the wastewater treatment equipment are connected according to the wastewater treatment process.

6. The wastewater treatment system according to claim 1, characterized in that, The internal space of the inner cylinder (1) is divided into an air purification chamber (11), a sludge chamber (12) and a greywater chamber (13) arranged along the axial direction of the inner cylinder (1) and isolated from each other. The air purification chamber (11) is located above the sludge chamber (12) and the greywater chamber (13).

7. The wastewater treatment system according to claim 2, characterized in that, Wastewater treatment equipment includes sludge-water separation equipment, advanced treatment equipment and sludge dewatering machine. The inlet of the sludge-water separation equipment is connected to the wastewater outlet of the treatment cylinder. The inlet of the advanced treatment equipment is connected to the clear water outlet of the secondary sedimentation equipment. The outlet of the advanced treatment equipment is connected to the inlet (131) of the greywater chamber (13). The sludge outlet of the secondary sedimentation equipment is connected to the sludge inlet (122) of the sludge chamber (12). The sludge outlet (123) of the sludge chamber (12) is connected to the inlet of the sludge dewatering machine. The polluted gas outlets of the mud-water separation equipment, the deep treatment equipment, and the sludge dewatering machine are all connected to the polluted gas inlet (111).

8. The wastewater treatment system according to claim 7, characterized in that, The air purification device includes a biological filter and an activated carbon adsorption unit connected in sequence along the direction of the polluted gas flow. The polluted gas inlet (111) includes a first polluted gas inlet for supplying polluted gas to the biological filter and a second polluted gas inlet for supplying polluted gas to the activated carbon adsorption unit. The upper gas layer of the anaerobic tank (21), the upper gas layer of the anoxic tank (22), the upper gas layer of the sludge chamber (12), and the polluted gas outlet of the sludge dewatering machine are all connected to the first polluted gas inlet. The upper gas layer of the aerobic tank (23), the polluted gas outlet of the sludge-water separation equipment, and the polluted gas outlet of the deep treatment equipment are all connected to the second polluted gas inlet.

9. The wastewater treatment system according to claim 8, characterized in that, The treatment space between the inner cylinder (1) and the outer cylinder (2) is further divided into an anoxic tank (24), and the upper gas layer of the anoxic tank (24) is connected to the second pollutant gas inlet.

10. The wastewater treatment system according to claim 8, characterized in that, The wastewater treatment equipment also includes interconnected solid-liquid separation devices, which are used to perform coarse filtration on the wastewater entering the treatment cylinder. The polluted gas outlet of the solid-liquid separation device in the treatment cylinder is connected to the first polluted gas inlet.

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