A comprehensive sewage treatment system

Abstract

The present invention provides a comprehensive sewage treatment system, comprising a water inlet pump, at least one purification device, at least one gas-liquid mixing tower, and a transfer pump connected in sequence; wherein the gas-liquid mixing tower is provided with a water collection unit, an air inlet unit, a gas-liquid mixing unit, a water distribution unit, a cooling dehumidification and demisting unit, and a clean water washing unit in sequence from bottom to top; an air outlet is provided at the top of the gas-liquid mixing tower, and the air outlet is connected to a fan; the water outlet of the purification device is connected to the water collection unit through a first pipeline; the air inlet unit is used to transport ambient air or dust-containing gas to the gas-liquid mixing tower; during the contact process between the ambient air or the dust-containing gas and the sewage, the sewage is aerated to achieve aerobic treatment of the sewage. The present invention combines the aerobic treatment process of sewage with a circulating water cooling system, avoids the need to separately set up an aerobic treatment device, reduces equipment costs, and allows the dust-containing gas to be purified.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial sewage treatment, and in particular to a comprehensive sewage treatment system. Background Art

[0002] The existing industrial wastewater treatment process usually uses a separate wastewater treatment device to remove organic pollutants in the wastewater through biochemical methods, and then recycles the treated water, which makes the industrial wastewater treatment process costly. Summary of the invention

[0003] The problem solved by the present invention is that the existing industrial sewage treatment process has high cost.

[0004] To solve the above problems, the present invention provides a comprehensive sewage treatment system, comprising a water inlet pump, at least one purification device for removing oil and particles, at least one gas-liquid mixing tower with a cooling tower function, and a transfer pump connected in sequence; wherein,

[0005] The gas-liquid mixing tower is provided with a water collection unit, an air intake unit, a gas-liquid mixing unit, a water distribution unit, a cooling, dehumidification and demisting unit and a clean water washing unit from bottom to top;

[0006] An air outlet is provided at the top of the gas-liquid mixing tower, and the air outlet is connected to a fan;

[0007] The purification device is used to purify the primary sewage and the circulating sewage in the water collection unit, and the water outlet of the purification device is connected to the water collection unit through a first pipeline;

[0008] The transfer pump is used to transport the sewage in the water collection unit to the water distribution unit;

[0009] The first pipeline is provided with a dosing device;

[0010] The air inlet unit is used to transport ambient air or dust-containing gas into the gas-liquid mixing tower;

[0011] During the contact between the ambient air or the dust-containing gas and the sewage, the sewage is aerated to achieve aerobic treatment of the sewage.

[0012] Optionally, the temperature of the sewage in the first pipeline is not higher than 45°C.

[0013] Optionally, the condensed water collected by the cooling, dehumidifying and demisting unit is used as grey water.

[0014] Optionally, an aerobic treatment unit is further provided in the gas-liquid mixing tower, and the aerobic treatment unit is provided between the water distribution unit and the gas-liquid mixing unit.

[0015] Optionally, the aerobic treatment unit includes a carrier, and aerobic degradation bacteria supported on the carrier.

[0016] Optionally, the gas-liquid mixing unit includes a gas-liquid mixing body, in which a plurality of tubular channels are arranged, each of the tubular channels is cross-connected with at least two channels with different distribution directions at the same time, and a variable diameter structure is formed at the intersection to constitute Venturi mixing.

[0017] Optionally, an anaerobic treatment device is also included; the anaerobic treatment device is arranged between the purification device and the gas-liquid mixing tower.

[0018] Optionally, the anaerobic treatment device comprises an anaerobic treatment tank, in which an anaerobic water inlet section, at least one anaerobic treatment section, and an anaerobic water outlet section are sequentially arranged from top to bottom.

[0019] Optionally, the anaerobic treatment section includes a microbial carrier and anaerobic bacteria loaded on the microbial carrier.

[0020] Compared with the prior art, the comprehensive sewage treatment system provided by the present invention has the following advantages:

[0021] The comprehensive sewage treatment system provided by the present invention combines the aerobic treatment process of sewage with the circulating water cooling system, thus avoiding the need to set up a separate aerobic treatment device, reducing equipment costs, and achieving zero sewage discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a simplified structural diagram of the comprehensive sewage treatment device in the present invention;

[0023] Figure 2 A top view of the gas-liquid mixing unit of the present invention;

[0024] Figure 3 is a cross-sectional view of the gas-liquid mixing unit of the present invention;

[0025] Figure 4 It is a simplified structural diagram of the anaerobic treatment device in the present invention.

[0026] Description of reference numerals:

[0027] 1-water inlet pump; 2-anaerobic treatment device; 21-water outlet; 22-anaerobic water inlet section; 23-anaerobic treatment section; 24-anaerobic water outlet section; 3-gas-liquid mixing tower; 31-water collection unit; 32-air inlet unit; 33-gas-liquid mixing unit; 331-gas-liquid mixing body; 3311-channel; 34-water distribution unit; 35-air outlet; 36-cooling, dehumidification and demisting unit; 37-aerobic treatment unit; 4-first pipeline; 5-dosing device; 6-transfer pump; 7-drainage pump; 8-purification device. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are only used to simplify the description and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" the first feature may include that the first feature is in direct contact with the second feature, or may include that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] The existing sewage treatment process mostly includes anaerobic treatment process and aerobic treatment process. In the traditional aerobic treatment process, it is necessary to set up a separate aerobic treatment device, and aerate the sewage by aerating the aerobic treatment device. In the traditional aerobic treatment process, the cost of sewage treatment is high due to the need to provide an aerobic treatment device and perform continuous aeration. In addition, for some industrial sewage with high salt, high COD and special pollutants such as antibiotics, it is difficult to directly treat these industrial sewage into recyclable industrial water through biochemical methods, which makes the recycling of these industrial sewage difficult.

[0034] In order to solve the problem of high cost in the existing sewage treatment process, the present invention provides a comprehensive sewage treatment system. Figure 1 As shown, the comprehensive sewage treatment device includes a water inlet pump 1 connected in sequence, at least one purification device 8 for removing oil and particulate matter, at least one gas-liquid mixing tower 3 with a cooling tower function, and a transfer pump 6; wherein the purification device 8 can be a simple component such as a filter screen, or a filtering device suitable for filtering sewage, such as a sand layer tank, a membrane filtering device, etc., and the present application does not specifically limit the purification device 8; the gas-liquid mixing tower 3 is provided with a water collection unit 31, an air inlet unit 32, a gas-liquid mixing unit 33, a water distribution unit 34, a cooling, dehumidification and demisting unit 36 ​​and a clean water washing unit from bottom to top; the top of the gas-liquid mixing tower 3 is provided with an air outlet 35, and the air outlet 35 is connected to the fan; the purification device 8 is used to purify the primary sewage and the collection The circulating sewage in the water unit 31, the water outlet of the purification device 8 is connected to the water collection unit 31 through the first pipeline 4; at the same time, the water inlet of the transfer pump 6 is connected to the water collection unit 31 through the pipeline, and the water outlet is connected to the water distribution unit 34 through the pipeline; the sewage collected in the water collection unit 31 is transported to the water distribution unit 34 through the transfer pump 6 to realize water circulation; a dosing device 5 is provided on the first pipeline 4; the dosing device 5 can be used to add aerobic degradation bacteria to the first pipeline 4, and can also be used to add anti-corrosion, anti-scaling and anti-algae drugs to the first pipeline 4; the air inlet unit 32 is used to transport ambient air or dust-containing gas to the gas-liquid mixing tower 3; during the contact between ambient air or dust-containing gas and sewage, the sewage is aerated to realize aerobic treatment of the sewage.

[0035] Among them, the water inlet pump 1, the purification device 8 and the gas-liquid mixing tower 3 are connected by pipelines; the water inlet pump 1 is used to transport the sewage to be treated to the purification device 8, and after the purification device 8 performs preliminary oil and particle removal treatment on the sewage, the preliminary purified sewage is further transported to the gas-liquid mixing tower 3; the sewage can be transported between the purification device 8 and the gas-liquid mixing tower 3 through the height difference, and a transfer pump 6 can also be set between the purification device 8 and the gas-liquid mixing tower 3 to transport the sewage after anaerobic treatment.

[0036] In order to reduce the cost of sewage treatment, the present application prefers that the gas-liquid mixing tower 3 is an existing device in the device, such as a cooling tower used to cool industrial exhaust gas in the steel, chemical and other industries, and a dust removal tower used to purify industrial exhaust gas; the present application transports the purified sewage to the existing gas-liquid mixing tower 3, so that the purified sewage is used as the liquid phase medium in the gas-liquid mixing tower 3, so that the ambient air or dust-containing gas entering the gas-liquid mixing tower 3 plays an aeration role in the process of contact with the sewage, thereby realizing aerobic treatment of the sewage.

[0037] In order to enable the gas-liquid mixing tower 3 to have the function of aerobic treatment on the basis of satisfying its original function, the present application preferably provides a water collection unit 31, an air inlet unit 32, a gas-liquid mixing unit 33, a water distribution unit 34, a cooling dehumidification and demisting unit 36 ​​and a clean water washing unit in the gas-liquid mixing tower 3 from bottom to top; an air outlet 35 is provided at the top of the gas-liquid mixing tower 3; in order to facilitate the flow of ambient air or dust-containing gas, a fan can be provided at the top of the air inlet unit 32 or the gas-liquid mixing tower 3, and the present application preferably connects the air outlet 35 to the fan (not shown in the figure); the water outlet of the purification device 8 is connected to the water distribution unit 34 through the first pipeline 4, which is used to transport the purified sewage to the water distribution unit 3 4; a dosing device 5 is provided on the first pipeline 4, and the dosing device 5 is used to add aerobic degradation bacteria into the first pipeline 4 to ensure the anaerobic treatment effect; drugs with anti-corrosion, anti-scaling and anti-algae functions can also be added to the first pipeline 4 to avoid pipeline clogging after pipeline corrosion; to ensure the anaerobic treatment effect, the present application preferably sets the dosing device 5 on the first pipeline 4 near the gas-liquid mixing tower 3; the air inlet unit 32 is connected to the air conveying device, which is used to convey air to the gas-liquid mixing tower 3; to ensure the aerobic treatment effect, the present application preferably conveys the oxygen content of the air to the gas-liquid mixing tower 3 to be not less than 10%; during the contact between the air and the sewage after anaerobic treatment, the sewage is aerated to achieve aerobic treatment of the sewage.

[0038] During the operation of the comprehensive sewage treatment system, after the sewage to be treated is purified in the purification device 8, it is transported to the water distribution unit 34 in the gas-liquid mixing tower 3. The water distribution unit 34 can use a water distributor of any structural form. Under the action of the water distribution unit 34, the sewage enters the gas-liquid mixing unit 33 located below the water distribution unit 34; at the same time, the air is transported to the gas-liquid mixing tower 3 through the air inlet unit 32, and moves upward under the action of the fan and enters the gas-liquid mixing unit 33; in the gas-liquid mixing unit 33, the sewage and the air are fully mixed. During the mixing process, on the one hand, the sewage is cooled by the air to realize the cooling function; on the other hand, the sewage is aerated by the air to promote aerobic treatment of the sewage.

[0039] After the sewage and air are fully mixed in the gas-liquid mixing unit 33, the sewage after aerobic treatment continues to move downward and enters the water collecting unit 31 located at the bottom of the gas-liquid mixing tower 3, and then the treated water in the water collecting unit 31 is transported to the corresponding process for recycling again through the drainage pump 7; the present application preferably transports the treated water in the water collecting unit 31 to the inlet of the purification device 8 through the drainage pump 7, and further, the drainage pump 7 can be combined with the water inlet pump 1 for use together, that is, the drainage pump 7 is reduced, and the water collecting unit 31 is connected to the inlet of the water inlet pump 1 through a pipeline, thereby reducing the use of the drainage pump 7; in order to improve the sewage treatment effect, the water in the water collecting unit 31 can also be transported to the water distribution unit 34 through the drainage pump 7, so that the water can be aerobically treated again during the falling process.

[0040] The treated wastewater can be reused as circulating cooling water, and can be reused by heat exchange and cooling of devices or materials without direct contact with materials or reaction. Therefore, for industrial wastewater with high salt, high COD and special pollutants such as antibiotics, even if the wastewater still contains some organic pollutants after treatment through the above process, it will not affect the reuse of this part of the wastewater, thereby reducing the cost of wastewater treatment on the one hand, and on the other hand, it is also beneficial to reduce the amount of make-up water used in production, reduce wastewater discharge, and even achieve zero wastewater discharge, further reducing production costs.

[0041] During the reuse of this part of the treated sewage, in order to avoid clogging of the pipeline or device due to scaling, it is preferred to add corresponding anti-scaling agents or anti-algae growth agents to the reused pipeline or device; the specific type of agent depends on the nature of the sewage.

[0042] During the contact between sewage and air in the gas-liquid mixing tower 3, part of the water in the sewage is evaporated and carried away, making the concentration of pollutants in the sewage higher and higher; in order to improve the sewage treatment effect, a corresponding filtering device can be added to facilitate the removal of solid matter that appears in the treated sewage due to crystallization, etc.; during the treatment process, when the treated sewage is concentrated to a certain extent, the concentrated sewage with a higher pollutant content can be collected and treated in accordance with the hazardous waste treatment method.

[0043] At the same time, after the air passes through the gas-liquid mixing unit 33 and is fully mixed with the sewage in the gas-liquid mixing unit 33, a part of the water vapor in the sewage is taken away, so that the water content in this part of the air is relatively high. If it is discharged directly, white smoke is likely to appear. In order to reduce white smoke, a cooling, dehumidification and demisting unit 36 ​​is also provided in the gas-liquid mixing tower 3 in the present application. The cooling, dehumidification and demisting unit 36 ​​is arranged above the water distribution unit 34. The cooling, dehumidification and demisting unit 36 ​​realizes the function of removing white smoke by condensing water vapor in the air. The cooling, dehumidification and demisting unit 36 ​​can be any structure suitable for removing white smoke from the air in the prior art, and the specific structural form of the cooling, dehumidification and demisting unit 36 ​​can be determined according to the properties of the air. The present application preferably comprises a heat exchanger for the cooling, dehumidification and demisting unit 36.

[0044] The air passes through the cooling, dehumidifying and demisting unit 36 ​​during its rising process, and water vapor in the air is removed by the cooling, dehumidifying and demisting unit 36 ​​to avoid the generation of white smoke after the air is discharged.

[0045] Furthermore, the present application preferably collects the condensed water generated in the cooling, dehumidification and demisting unit 36, and preferably uses the collected condensed water as grey water to improve the utilization rate of water resources.

[0046] In order to avoid the discharged air not meeting the emission standards, the comprehensive sewage treatment system provided by the present application also includes a clean water washing unit (not shown in the figure), which can be arranged in the gas-liquid mixing tower 3 or outside the gas-liquid mixing tower 3; the present application preferably arranges the clean water washing unit in the gas-liquid mixing tower 3, so that the air can be further washed by the clean water washing unit before being discharged, so as to avoid pollution caused by air discharge.

[0047] The air washed with clean water is discharged from the air outlet 35 under the action of the fan; the present application preferably further detects the discharged air, and if it meets the emission requirements, the air discharged from the air outlet 35 is directly discharged; if it does not meet the emission requirements, the air can be transported to the air inlet unit 32 again, so that the air is purified again during the rising process, or cooled again; the air that does not meet the emission requirements can also be transported to other exhaust gas treatment devices, and the air is deeply treated again before being discharged; for example, according to the composition of the discharged air, before the air is discharged, the air can be cleaned by adding corresponding agents, and then cleaned with clean water, until the treated air meets the emission standards and then discharged.

[0048] The comprehensive sewage treatment system provided by the present invention combines the aerobic treatment process of sewage with the circulating water cooling treatment process to avoid the need for a separate aerobic treatment device, thereby reducing the cost of sewage treatment and achieving zero discharge of sewage.

[0049] The comprehensive sewage treatment system provided by the present invention can combine the sewage treatment process with the reuse process for sewage that is difficult to treat by biochemical methods. Compared with the traditional treatment process of treating sewage until it meets the discharge standards and then reusing it, it helps to reduce sewage treatment costs, improve sewage reuse rates, and reduce sewage discharge.

[0050] The comprehensive sewage treatment system provided in the present application can not only purify the dust-containing gas by bringing sewage at room temperature or lower temperature into contact with dust-containing gas at higher temperature, but also preheat the sewage, that is, recover the waste heat in the tail gas, so as to facilitate the reuse of the sewage; it can also cool the sewage by bringing sewage at higher temperature into contact with ambient air or dust-containing gas at room temperature, so that the treated sewage can be used for cooling water recycling, thereby realizing the combination of aerobic treatment and circulating water cooling treatment.

[0051] Specifically, one processing situation is that the dust-containing gas transported by the air inlet unit 32 to the gas-liquid mixing tower 3 is industrial hot air; in this case, the amount of industrial hot air transported by the air inlet unit 32 needs to be calculated based on the temperature of the industrial hot air and the temperature of the sewage. The specific calculation basis is that after the industrial hot air is input, the temperature of the sewage in the gas-liquid mixing tower 3 needs to be controlled to be no higher than 45°C to avoid inactivation of aerobic degradation bacteria due to excessively high temperature.

[0052] In another case, the sewage transported in the first pipeline 4 is sewage with a relatively high temperature, and the temperature of the sewage in the first pipeline 4 needs to be controlled so that the water temperature in the water collection unit can be controlled at no higher than 45°C; the present application preferably has a temperature of the sewage in the first pipeline 4 that is no higher than 45°C to avoid inactivation of aerobic degradation bacteria due to excessively high sewage temperature; at the same time, the air that comes into contact with the sewage with a relatively high temperature is preferably ambient air at normal temperature; that is, in this case, the gas-liquid mixing tower 3 can be a cooling tower, which can cool the sewage while aerobically treating the sewage through air, thereby combining the aerobic treatment process of the sewage with the circulating water cooling process.

[0053] In order to further improve the aerobic treatment effect, the present application preferably further provides an aerobic treatment unit 37 in the gas-liquid mixing tower 3 , and the aerobic treatment unit 37 is provided between the water distribution unit 34 and the gas-liquid mixing unit 33 .

[0054] Specifically, the present application prefers that the aerobic treatment unit 37 includes a carrier capable of carrying aerobic degrading bacteria, and aerobic degrading bacteria carried on the carrier; the present application prefers that the carrier includes ceramic particles, so that when the sewage passes through the aerobic treatment unit 37, the sewage is aerobically treated under the action of aerobic degrading bacteria and industrial exhaust gas.

[0055] To ensure that sewage and industrial exhaust gas are fully in contact, see Figure 2 , Figure 3 As shown, the preferred gas-liquid mixing unit 33 of the present application includes a gas-liquid mixing body 331, and a plurality of tubular channels 3311 are arranged in the gas-liquid mixing body 331. Each tubular channel 3311 is cross-connected with at least two channels 3311 with different distribution directions at the same time, and a variable diameter structure is formed at the intersection to constitute Venturi mixing.

[0056] The plurality of channels 3311 in the gas-liquid mixing unit 33 intersect and penetrate each other to form a mixed flow zone of sewage and air; after the sewage and air enter the gas-liquid mixing unit 33, the air is divided into a plurality of fine air columns by the plurality of channels 3311, which continuously collide with the sewage in the channels 3311, are fully mixed and contacted, and sufficient aeration of the sewage is achieved, thereby promoting the aerobic treatment process; further, by making each channel 3311 connected to at least two channels 3311 with different distribution directions, when the air reaches the position where a certain channel 3311 intersects with other channels 3311 with different distribution directions, the cross-sectional area of ​​the channel 3311 becomes larger, thereby forming a negative pressure at the position, which plays a role of Venturi mixing, and more air and sewage are sucked into the channel 3311 through the formed negative pressure, thereby playing a role of efficient mixing.

[0057] Furthermore, in order to improve the sewage treatment effect, the present application preferably prefers that the comprehensive sewage treatment system also includes an anaerobic treatment device 2; the anaerobic treatment device 2 is arranged between the purification device 8 and the gas-liquid mixing tower 3, and the water outlet 21 of the anaerobic treatment device 2 is connected to the water distribution unit 34 through the first pipeline 4, which is used to transport the sewage after anaerobically treatment to the water distribution unit 34; in order to reduce the floor space of the comprehensive sewage treatment system, the present application prefers that the anaerobic treatment device 2 is a vertical device.

[0058] See also Figure 4 As shown, the anaerobic treatment device 2 includes an anaerobic treatment tank, in which an anaerobic water inlet section 22, at least one anaerobic treatment section 23, and an anaerobic water outlet section 24 are sequentially arranged from top to bottom.

[0059] An anaerobic water inlet is provided at the anaerobic water inlet section 22; the water outlet of the water inlet pump 1 is connected to the anaerobic water inlet through a pipeline; a water outlet 21 is provided at the anaerobic water outlet section 24; the water outlet 21 is connected to the gas-liquid mixing tower 3; an exhaust port for discharging gas is provided at the top of the anaerobic tank body, so that methane and other gases generated during the anaerobic treatment process can be discharged through the exhaust port; the exhaust port can be connected to the gas collection unit through a pipeline, so as to recycle the gas generated in the anaerobic stage.

[0060] During the operation of the sewage treatment device, the water inlet pump 1 transports the sewage to be treated to the purification device 8 for preliminary purification, and then transports the preliminary purified sewage to the anaerobic water inlet section 22 through the anaerobic water inlet. The sewage entering the anaerobic water inlet section 22 flows downward into the anaerobic treatment section 23, and the sewage is anaerobically treated in the anaerobic treatment section 23. After the anaerobic treatment, part of the organic matter in the sewage is decomposed, metabolized, and digested, and the organic matter content is reduced. At the same time, methane and other gases are generated. The generated methane and other gases are discharged through the exhaust port and collected. The sewage after the anaerobic treatment enters the anaerobic effluent section 24. The sewage after the anaerobic treatment in the anaerobic effluent section 24 is further transported to the gas-liquid mixing tower 3 for aerobic treatment.

[0061] The present invention designs the anaerobic treatment device 2 as a vertical device, and the anaerobic water inlet section 22, the anaerobic treatment section 23 and the anaerobic water outlet section 24 are arranged in sequence in the vertical direction in the tank body. While ensuring the anaerobic treatment effect, the space occupied by the anaerobic treatment tank is extended upward, which helps to reduce the floor area of ​​the anaerobic treatment tank, and further helps to reduce the floor area of ​​the comprehensive sewage treatment system.

[0062] The anaerobic treatment section 23 may be carried out by adopting any form of anaerobic treatment process in the prior art. The present application preferably comprises a microbial carrier and anaerobic bacteria loaded on the microbial carrier, and further preferably the microbial carrier is ceramic particles, so that the sewage can be anaerobically treated by anaerobic bacteria during the sewage passes through the anaerobic treatment section 23.

[0063] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A comprehensive sewage treatment system, characterized in that: The invention comprises a water inlet pump (1), at least one purification device (8) for removing oil and particles, at least one gas-liquid mixing tower (3) having a cooling tower function, and a transfer pump (6) which are connected in sequence; wherein the gas-liquid mixing tower (3) is provided with a water collection unit (31), an air inlet unit (32), a gas-liquid mixing unit (33), a water distribution unit (34), a cooling, dehumidification and demisting unit (36) and a clean water washing unit in sequence from bottom to top; an air outlet (35) is provided at the top of the gas-liquid mixing tower (3), and the air outlet (35) is connected to a fan; the purification device (8) is used to purify primary sewage and circulating sewage in the water collection unit (31), and the water outlet of the purification device (8) is connected to the water collection unit (31) through a first pipeline (4); the transfer pump (6) is used to transport the sewage in the water collection unit (31) to the water distribution unit (34) to realize water circulation; the first pipeline (4) is connected to the water distribution unit (34) to realize water circulation. A dosing device (5) is arranged on the road (4); the air inlet unit (32) is used to transport dust-containing gas to the gas-liquid mixing tower (3); during the contact between the dust-containing gas and the sewage, the sewage is aerated to achieve aerobic treatment of the sewage; an aerobic treatment unit (37) is also arranged in the gas-liquid mixing tower (3), and the aerobic treatment unit (37) is arranged between the water distribution unit (34) and the gas-liquid mixing unit (33); the aerobic treatment unit (37) includes a carrier and aerobic degradation bacteria loaded on the carrier; the gas-liquid mixing unit (33) includes a gas-liquid mixing body (331), and a plurality of tubular channels (3311) are arranged in the gas-liquid mixing body (331), and each tubular channel (3311) is cross-connected with at least two channels (3311) with different distribution directions at the same time, and a variable diameter structure is formed at the intersection to constitute Venturi mixing.

2. The comprehensive sewage treatment system according to claim 1, characterized in that: The temperature of the sewage in the first pipeline (4) is not higher than 45°C.

3. The comprehensive sewage treatment system according to claim 1, characterized in that: The condensed water collected by the cooling, dehumidifying and demisting unit (36) is used as grey water.

4. The comprehensive sewage treatment system according to any one of claims 1 to 3, characterized in that: It also includes an anaerobic treatment device (2); the anaerobic treatment device (2) is arranged between the purification device (8) and the gas-liquid mixing tower (3).

5. The comprehensive sewage treatment system according to claim 4, characterized in that: The anaerobic treatment device (2) comprises an anaerobic treatment tank, in which an anaerobic water inlet section (22), at least one anaerobic treatment section (23), and an anaerobic water outlet section (24) are arranged in sequence from top to bottom.

6. The comprehensive sewage treatment system according to claim 5, characterized in that: The anaerobic treatment section (23) comprises a microbial carrier and anaerobic bacteria loaded on the microbial carrier.

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