Sewage treatment equipment

Abstract

The utility model provides sewage treatment equipment. The sewage treatment equipment comprises a shell, a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a membrane tank, wherein a feeding hole is formed in a first side wall on one side of the shell; a discharge hole is formed in a second side wall on the other side of the shell; the pre-denitrification tank, the anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are sequentially arranged in the shell in the direction from the first side wall to the second side wall and are sequentially communicated; the water inlet pipe extends to the upper part of the anaerobic tank from the first side wall and is provided with a first water outlet facing the opening of the pre-denitrification tank and a second water outlet facing the opening of the anaerobic tank; the sludge return pipeline extends from the upper part of the pre-denitrification tank to the upper part of the membrane tank, and continues to extend towards the membrane module on one side of the filter inlet of the membrane module so as to penetrate through the membrane module to reach the bottom of the membrane tank; the nitrification liquid backflow pipeline extends from the upper part of the anoxic tank to the upper part of the aerobic tank and continues to extend towards the bottom of the aerobic tank, and a backflow inlet is formed in the bottom of the nitrification liquid backflow pipeline, so that the installation efficiency of the equipment is improved, and the recycling of water resources is realized.

Description

Technical Field

[0001] The present application relates to the field of water treatment technology, and in particular to a sewage treatment device. Background Art

[0002] Taking effective measures to scientifically treat rural domestic sewage is an urgent need to improve the rural ecological environment and create a healthy and harmonious ecological environment. It is an inevitable measure to achieve new rural construction and improve the quality of rural life, and it is also an inevitable requirement for rural economic development. Unlike urban sewage, which is discharged in a centralized manner, rural domestic sewage is widely distributed and dispersed, and most of it lacks supporting pipe networks. Therefore, a domestic sewage treatment solution with simple processes, adapted to the characteristics of rural domestic sewage, and with better treatment effects is needed. Utility Model Content

[0003] The embodiment of the utility model provides a decentralized domestic sewage treatment system, which eliminates the defects of the domestic sewage treatment equipment in the prior art, such as the complicated installation process and poor treatment effect.

[0004] The present invention provides a sewage treatment device, comprising:

[0005] A housing, wherein a first side wall of one side of the housing is provided with a feed port penetrating the first side wall and a second side wall of the opposite side is provided with a discharge port penetrating the second side wall;

[0006] a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, and a membrane tank, wherein the pre-denitrification tank, anaerobic tank, anoxic tank, aerobic tank, and membrane tank are sequentially arranged in the shell in the direction from the first side wall toward the second side wall, a water inlet pipe is connected to the feed port on the inner side of the first side wall, the water inlet pipe extends from the first side wall above the anaerobic tank, and the water inlet pipe has a first drain port opening toward the pre-denitrification tank and a second drain port opening toward the anaerobic tank, the pre-denitrification tank has a first communication port communicating with the anaerobic tank, the anaerobic tank has a second communication port communicating with the anoxic tank, the anoxic tank has a third communication port communicating with the aerobic tank, the aerobic tank has a fourth communication port communicating with the membrane tank, and a membrane assembly is provided in the membrane tank, the membrane assembly covers the bottom of the membrane tank, a filter outlet is provided on the side of the membrane assembly opposite to the fourth communication port, and the filter outlet is connected to the discharge port.

[0007] The sludge return pipe is configured to extend from above the pre-denitrification tank to above the membrane tank and continue to extend toward the membrane module on the filter inlet side of the membrane module to pass through the membrane module to reach the bottom of the membrane tank.

[0008] The nitrification liquid reflux pipeline is arranged to extend from above the anoxic tank to above the aerobic tank and further extend toward the bottom of the aerobic tank and has a reflux inlet at the bottom of the aerobic tank.

[0009] The sewage treatment equipment provided by the embodiment of the present invention is configured such that a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, and a membrane tank are housed in a shell, and a feed port is provided on the side wall of one side of the shell and a discharge port is provided on the side wall of the other side. A pre-denitrification tank is provided in front of the anaerobic tank, and a water outlet of a water inlet pipe is provided above both the pre-denitrification tank and the anaerobic tank. The sludge return pipe is configured to extend from above the bottom pool of the membrane module and finally extend parallel to the pool to above the pre-denitrification tank, so that the sludge at the bottom of the membrane module can be returned to the pre-denitrification tank for treatment, so that when in use, only the feed port can be connected. The equipment can be installed by simply installing the equipment through the outlet, which improves the installation efficiency of the equipment. The sludge returned from the membrane pool can first be denitrified by the denitrifying bacteria in the pre-denitrification tank using the carbon source in the influent to remove the nitrate nitrogen carried in the sludge, and then the treated return sludge is transported to the anaerobic tank together with the feed, thereby eliminating the effect of the nitrate nitrogen originally carried in the return sludge on phosphorus removal in the anaerobic tank, preventing the deterioration of the sewage treatment effect, improving the treatment efficiency, and allowing the treated water discharged from the outlet to be directly used for domestic purposes such as greening, thereby realizing the recycling of water resources.

[0010] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0012] Figure 1 The figure schematically shows the overall structure of a sewage treatment device according to one embodiment of the present application. DETAILED DESCRIPTION

[0013] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0014] With the rapid economic and social development of my country, farmers' living standards have continued to improve, and their lifestyles have undergone tremendous changes. Rural domestic sewage discharge has also increased dramatically. The reckless discharge of untreated rural domestic sewage has seriously impacted the rural ecological environment, exacerbated the water resource crisis, and directly threatened the health of farmers and rural economic development. Taking effective measures to scientifically treat rural domestic sewage is an urgent need to improve the rural ecological environment and create a healthy and harmonious ecological environment. It is an inevitable measure to achieve new rural construction and improve the quality of rural life, and it is also an inevitable requirement for rural economic development. Unlike urban sewage, which is discharged in a centralized manner, rural domestic sewage is widely distributed and dispersed, and most of it lacks supporting pipe networks. Therefore, a domestic sewage treatment solution with simple processes, adapted to the characteristics of rural domestic sewage, and with better treatment effects is needed.

[0015] To this end, existing domestic sewage treatment solutions based on denitrification have been proposed. For example, an anoxic tank, an aerobic tank, and a membrane tank, such as an MBR membrane, can be used in sequence. The domestic sewage can first undergo certain pretreatment processes, such as using a mesh to intercept or filter suspended and floating matter, preventing large foreign matter or large amounts of hair from entering the sewage treatment equipment. The pretreated sewage then enters the anoxic tank, where heterotrophic bacteria convert soluble organic matter into organic acids, breaking down large organic molecules into small ones, converting insoluble organic matter into soluble organic matter, and ammonifying pollutants such as proteins and fats. Subsequently, in the aerobic tank, the organic matter is converted into gaseous nitrogen for discharge, and finally filtered through the MBR membrane module to produce treated water suitable for discharge or recycling. However, this sewage treatment solution only performs denitrification, but does not remove phosphorus from the sewage. Therefore, the treated sewage requires the use of additional chemical dephosphorization agents for phosphorus removal, which is not only costly but also easily interferes with the biochemical treatment process.

[0016] Furthermore, existing technologies have proposed domestic sewage treatment solutions based on nitrogen and phosphorus removal. For example, based on the aforementioned solutions using anoxic and aerobic tanks, as well as membrane tanks such as MBR membranes, anaerobic tanks can be added. Similarly pretreated domestic sewage can first enter the anaerobic tank to release phosphorus, and then enter the anoxic and aerobic tanks to undergo similar denitrification treatment.

[0017] However, in such existing solutions, a reflux pump is required to pump the treated water that has passed through the aerobic tank and entered the MBR membrane tank back to the anaerobic tank and the anoxic tank again to repeatedly release phosphorus and denitrify. However, since the reflux liquid has been treated in the aerobic tank, it inevitably carries nitrate nitrogen and dissolved oxygen, which will affect the release of phosphorus in the anaerobic zone. In particular, when the carbon source in the sewage to be treated is insufficient, the sewage will consume the degraded carbon source when entering the anaerobic zone, resulting in insufficient carbon source for denitrification, thereby affecting the denitrification effect in the anoxic tank. For this reason, Figure 1 As shown in Figure 1 Schematic diagram showing the structure of a sewage treatment device according to an embodiment of the present application. Figure 1 In the figure, the sewage treatment equipment may include: a pre-denitrification tank 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4 and a membrane tank 5, and a schematic diagram of the structure of the sewage treatment equipment of the embodiment housed therein. Figure 1 In the embodiment, the sewage treatment equipment may include a housing 20 of a pre-denitrification tank 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, and a membrane tank 5. For example, the pre-denitrification tank 1, the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4, and the membrane tank 5 may be arranged in a direction from the first side wall toward the second side wall, for example, Figure 1 The anaerobic tank 20 is sequentially arranged from left to right in the housing 20. A feed port 201 penetrating the first sidewall of the housing 20 may be provided on a first sidewall thereof, and a discharge port 202 penetrating the second sidewall thereof may be provided on a second sidewall thereof on the opposite side. The feed port 201 may be connected to a water inlet pipe 101 on the inner side of the first sidewall, which extends from the first sidewall to above the anaerobic tank 2.

[0018] The pre-denitrification tank 1 can be filled with an elastic composite filler, for example, an artificial synthetic fiber biological filler can be used as the basic filler, and denitrifying bacteria can be attached and grown thereon. The water inlet pipe 101 can be used to provide raw sewage to the pre-denitrification tank 1, and a first drain outlet 1011 can be provided above the pre-denitrification tank 1, which opens toward the pre-denitrification tank 1, so as to facilitate the injection of raw sewage into the pre-denitrification tank 1. In addition, in an embodiment of the present application, the water inlet pipe 101 can also further include a first drain pipe extending downward for a certain length at the pre-denitrification tank 1, and the first drain outlet 1011 can be located below the first drain pipe near one end of the pre-denitrification tank 1, so that the sewage discharged from the water inlet pipe 101 can be close to the liquid level maintained in the pre-denitrification tank 1. In addition, a switch valve can be further provided at the first drain outlet 1011 to control the amount of sewage discharged from the first drain outlet 1011 into the pre-denitrification tank 1 by adjusting the opening of the switch valve.

[0019] The pre-denitrification tank 1 may have a first communication port communicating with the anaerobic tank 2, and a first agitator 11 may be further provided in the pre-denitrification tank 1. The first agitator 11 may be located at the bottom of the pre-denitrification tank 1 on a side away from the anaerobic tank 2, so that the first agitator 11 can stir the liquid in the pre-denitrification tank 1 to fully mix the biochemical bacteria in the activated sludge with the sewage, degrade pollutants, and prevent sludge precipitation.

[0020] The anaerobic tank 2 can be set up next to the pre-denitrification tank 1, and a composite filler can also be set in the anaerobic tank 2 to facilitate the release of phosphorus through the polyphosphate bacteria therein and the rapid degradation of organic matter in the treated sewage transported from the pre-denitrification tank 1. In addition, in the embodiment of the present application, the water inlet pipe 101 can further extend from above the pre-denitrification tank 1 to above the anaerobic tank 2, and can also have a second drain port 1012 above the anaerobic tank 2 that opens toward the anaerobic tank 2, so as to facilitate the injection of raw sewage into the anaerobic tank 2. In addition, in the embodiment of the present application, the water inlet pipe 101 can also further include a second drain pipe extending downward for a certain length at the anaerobic tank 2, and the second drain port 1012 can be located below the second drain pipe at one end near the anaerobic tank 2, so that the sewage discharged from the water inlet pipe 101 can be close to the liquid level maintained in the anaerobic tank 2. In addition, a switch valve may be further provided at the second drain outlet 1012 so as to control the amount of sewage discharged from the second drain outlet 1012 to the anaerobic tank 2 by adjusting the opening of the switch valve.

[0021] Therefore, in the embodiment of the present application, the raw materials to be processed can enter the water inlet pipe 101 through the feed port on the side wall of the shell 20 and be transported to the pre-denitrification tank 1 and the anaerobic tank 2 at the same time, so that a part of the raw materials can be put into the pre-denitrification tank 1, and the microorganisms use the organic carbon source in the influent to carry out denitrification, remove the nitrate carried in the return sludge, and eliminate the adverse effects of nitrate on anaerobic phosphorus release.

[0022] The anaerobic tank 2 has a second communication port communicating with the anoxic tank 3, and a second agitator 21 may be further provided in the anaerobic tank 2. The second agitator 21 may be located at the bottom of the anaerobic tank 2 on a side away from the anoxic tank 3, so that the second agitator 21 can stir the liquid in the anaerobic tank 2 to move toward the anoxic tank 3 through the second communication port.

[0023] The anoxic tank 3 can be set up next to the anaerobic tank 2, and the anoxic tank 3 can also be provided with a composite filler so that the nitrate in the incoming sewage can be converted into nitrogen gas through biological denitrification by the denitrifying bacteria attached thereto, so as to escape into the atmosphere, thereby achieving the effect of sewage denitrification. Since a certain amount of carbon source is required in the denitrification process of biological denitrification in the anoxic tank to ensure a certain carbon-nitrogen ratio, the denitrification reaction in the anoxic tank 3 can proceed smoothly. Therefore, as mentioned above, by putting the raw material into the pre-denitrification tank 1 through the water inlet pipe 101, sufficient carbon source is left in the treated sewage transported from the pre-denitrification tank 1, so that the microorganisms use the organic carbon source in the influent to carry out denitrification, remove the nitrate carried in the return sludge, and eliminate the adverse effects of nitrate on anaerobic phosphorus release.

[0024] In addition, the anoxic pool 3 may have a third communication port connected to the aerobic pool 4, and a third agitator 31 may be further provided in the anoxic pool 3. The third agitator 31 may be located at the bottom of the anoxic pool 3 on a side away from the aerobic pool 4, so that the third agitator 31 can stir the liquid in the anoxic pool 3 to move toward the aerobic pool 4 through the third communication port.

[0025] The aerobic tank 4 can be set up adjacent to the anoxic tank 3, and a composite filler can also be set in the aerobic tank 4. Nitrifying bacteria exist on the biofilm attached to the composite filler and in the activated sludge in the tank. Combining the biofilm method with the activated sludge method can improve the shock resistance of the system, and can also convert the ammonia nitrogen produced by ammoniaization into nitrate nitrogen, and convert it into nitrate through biological nitrification, and can remove a large amount of organic matter. In addition, in an embodiment of the present application, the nitrification liquid return pipe 41 can be set to extend from above the anoxic tank 3 to above the aerobic tank 4 and continue to extend toward the bottom of the aerobic tank 4, so as to have a return inlet at the bottom of the aerobic tank 4. In addition, a nitrification liquid return pump 42 can be further set in the aerobic tank 4, which can be set on the side of the aerobic tank 4 adjacent to the anoxic tank 3, and its outlet can be connected to the return inlet of the nitrification liquid return pipe 41. Therefore, the nitrified liquid generated by nitrification in the aerobic tank 4 can be pumped through the nitrified liquid reflux pipe 41 by the nitrified liquid reflux pump 42 and returned to the anoxic tank 3 , so that denitrification treatment can be performed in the anoxic tank 3 .

[0026] The aerobic tank 4 may further have a fourth communication port communicating with the membrane tank 5 , so that the sewage treated in the aerobic tank 4 may flow into the membrane tank 5 through the fourth communication port.

[0027] A membrane assembly is provided in the membrane pool 5, which can cover the bottom of the membrane pool 5, and a filter outlet is provided on the side of the membrane assembly opposite to the fourth connecting port, which is connected to the discharge port 202, so that the treated sewage flowing in from the aerobic tank 4 through the fourth flow port can enter from the filter inlet of the membrane assembly and then leave from the filter outlet, thereby separating the mud and water of the treated sewage through the membrane assembly, and depositing the sludge at the bottom of the membrane pool 5, and discharging the water out of the equipment through the discharge port 202 for use.

[0028] Furthermore, in the embodiment of the present application, the sludge return pipe 51 can be configured to extend from above the pre-denitrification tank 1 to above the membrane tank 5 and continue to extend toward the membrane assembly so as to pass through the membrane assembly and reach the bottom of the membrane tank 5. That is, the sludge return pipe 51 can have a sludge return inlet at the bottom of the membrane tank 5, and a sludge return pump 52 can be further provided at the sludge return inlet, with its outlet connected to the return inlet of the sludge return pipe 51 located at the bottom of the membrane tank 5, so that the sludge accumulated at the bottom of the membrane tank 5 can be returned to the pre-denitrification tank 1 by means of the sludge return pump 52. Therefore, since the return sludge may carry nitrate nitrogen, if the nitrate nitrogen directly enters the anaerobic tank 2, it will consume the anaerobic bacteria in the anaerobic tank, greatly reducing the effect of phosphorus release by the anaerobic bacteria in the anaerobic tank 2. In the embodiment of the present application, the return sludge pipeline is arranged between the membrane tank 5 and the pre-denitrification tank 1, so that the sludge accumulated in the membrane tank 5 can return to the pre-denitrification tank 1. In the pre-denitrification tank, since the carbon source in the raw material can be provided through the water inlet pipe 101, the pre-denitrification tank 1 can use the carbon source supplemented from the raw material to denitrify the nitrate nitrogen carried in the return sludge. When the return sludge treated in this way enters the anaerobic tank 2 together with the raw material from the pre-denitrification tank 1, it contains less nitrate nitrogen that affects the anaerobic release of phosphorus, thereby ensuring the effect and efficiency of the treatment performed by the anaerobic tank 2.

[0029] In addition, in an embodiment of the present application, the membrane pool further includes a sludge return pump, which is arranged at the bottom of the membrane pool and located on the filtration inlet side of the membrane assembly, and the outlet of the sludge return pump is connected to the pipe inlet of the sludge return pipe located at the bottom of the membrane pool.

[0030] In addition, in an embodiment of the present application, the sewage treatment equipment further includes a suction component, the water suction port of the suction component is connected to the filtration outlet of the membrane component in the membrane pool, and the water outlet of the suction component is connected to the discharge port.

[0031] In addition, in the embodiment of the present application, an aeration pipe is provided at the bottom of the aerobic tank and the membrane tank, and the sewage treatment equipment further includes a fan assembly, the air outlet of the fan assembly is connected to the aeration pipe.

[0032] In addition, in an embodiment of the present application, the sewage treatment equipment further includes a phosphorus removal component, which is connected to the top of the membrane pool.

[0033] In addition, in an embodiment of the present application, the feed port is connected to a feed tank located outside the shell through a feed pipe, and the feed pipe extends from the feed port to the bottom of the feed tank.

[0034] In addition, in this embodiment of the present application, the sewage treatment equipment further includes a suction assembly 6. The suction assembly 6 can be one or more suction pumps, and its water inlet can be connected to the filtration outlet of the membrane module in the membrane pool 5. For example, the suction inlet of the suction assembly 6 can use the negative pressure generated by the suction pump to suck water from the sewage deposited in the membrane pool 5 through the filtration inlet of the membrane module into the membrane module, and then suck it out from the filtration outlet of the membrane module, while other substances can be deposited as sludge below the membrane module, that is, at the bottom of the membrane pool 5. In this embodiment of the present application, this sludge can be activated sludge and macromolecular organic matter, and therefore, an MBR membrane can be used as the membrane module. This ensures that when the suction pump 6 is used to form a negative pressure on the membrane module in the membrane pool 5 to absorb water, this sludge and macromolecular organic matter can remain in the membrane pool 5 because they cannot pass through the membrane module. The deposited sludge can then be transported to the pre-denitrification tank 1 for treatment via the sludge return pump 52 and the sludge return pipe 51. Of course, in the embodiment of the present application, the suction assembly 6 can also be connected to the membrane assembly through a special suction pipe, and the present application has no limitation to this.

[0035] In addition, in the embodiment of the present application, aeration pipes may be provided at the bottom of the aerobic tank 4 and the membrane tank 5, and the sewage treatment equipment may further include a fan assembly 7. The air outlet of the fan assembly 7 can generate vibrations in the membrane tank through the aeration pipe in the membrane tank, thereby preventing the MBR membrane from clogging during the filtration of sludge and macromolecular organic matter, which would affect the filtration effect. On the other hand, the fan assembly 7 can also replenish oxygen to the aerobic tank 4 through the aeration pipe located at the bottom of the aerobic tank 4, thereby ensuring an aerobic environment within the aerobic tank 4.

[0036] In addition, the water sucked from the membrane pool 5 by the suction equipment can be further subjected to ultraviolet disinfection by an additional ultraviolet sterilizer so that it meets the discharge standards or recycling requirements, so that the treated water discharged from the discharge port can be directly used for greening or other living purposes, for example, which can further improve the utilization rate of sewage.

[0037] In addition, in an embodiment of the present application, the sewage treatment equipment further includes a chemical cleaning tank 8. The chemical cleaning tank 8 can be a tank body for containing chemical cleaning agents, which can be provided with a water replenishment port and a drug outlet. The water replenishment port of the chemical cleaning tank 8 can be connected to the water outlet of the suction component of a suction pump, for example, and the drug outlet can be connected to the filtration inlet of the membrane component in the membrane pool 5, so that the chemical cleaning agent contained in the chemical cleaning tank 8 can be discharged from the drug outlet to the membrane component in the membrane pool 5 by gravity, so as to facilitate the cleaning of the contamination of the membrane component to avoid the treatment effect and treatment efficiency of the MBR membrane. When the amount of water in the chemical cleaning tank 8 is insufficient, a portion of the filtered water filtered through the membrane component in the membrane pool 5 can be sucked into the chemical cleaning tank 8 through the water replenishment port connected to the water outlet of the suction component to replenish the water in the chemical cleaning tank 8.

[0038] In addition, in the embodiment of the present application, the sewage treatment equipment may further include a phosphorus removal assembly 9. The phosphorus removal assembly 9 may be connected between the water suction port of the suction assembly 6 and the membrane assembly. Therefore, if the treated water treated by the sewage treatment equipment according to the embodiment of the present application needs to have a further improved phosphorus removal effect, the phosphorus removal assembly 9 may be used to chemically remove phosphorus from the treated water pumped from the membrane tank, thereby enhancing the phosphorus removal effect of the sewage treatment equipment according to the embodiment of the present application, so that the treated water meets or complies with the requirements for discharge or recycling of the treated water.

[0039] In addition, in the embodiment of the present application, the feed port on the side wall of the shell 20 can also be connected to the feed tank 10 through a feed pipe. The feed tank 10 can be arranged outside the shell 20, and can contain sewage to be treated, or sewage that has undergone some pretreatment. The feed pipe can be further extended to the bottom of the feed tank 10, so that the raw sewage can first be placed in the feed tank 10, for example, to undergo some pretreatment, and then, the raw sewage can be pumped to the feed pipe by, for example, a feed pump, and enter the water inlet pipe 101 through the feed port on the side wall of the shell 20 to be transported to the pre-denitrification tank 1 and the anaerobic tank 2.

[0040] The sewage treatment equipment provided by the embodiment of the present invention is achieved by accommodating a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a membrane tank in a shell, and providing a feed port on the side wall of one side of the shell and a discharge port on the side wall of the other side. A pre-denitrification tank is provided in front of the anaerobic tank, and a drain port of a water inlet pipe is provided above the pre-denitrification tank and the anaerobic tank. The sludge return pipe is provided to extend from above the bottom pool of the membrane module and finally extend parallel to the pool to above the pre-denitrification tank, so that the sludge at the bottom of the membrane module can be returned to the pre-denitrification tank for treatment, so that the sludge returned from the membrane tank is first denitrified by the denitrifying bacteria in the pre-denitrification tank using the carbon source in the influent to remove the nitrate nitrogen carried in the sludge, and then the treated return sludge is transported to the anaerobic tank together with the feed, thereby eliminating the influence of the nitrate nitrogen originally carried in the return sludge on the phosphorus removal in the anaerobic tank, preventing the deterioration of the sewage treatment effect, and improving the treatment efficiency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sewage treatment equipment, characterized in that: include; A shell, wherein a first side wall of one side of the shell is provided with a feed port penetrating the first side wall and a second side wall of the opposite side is provided with a discharge port penetrating the second side wall; A pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a membrane tank, wherein the pre-denitrification tank, the anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are sequentially arranged in the shell in the direction from the first side wall toward the second side wall, a water inlet pipe is connected to the feed port on the inner side of the first side wall, the water inlet pipe extends from the first side wall to the top of the anaerobic tank, and the water inlet pipe has a first drain port opening toward the pre-denitrification tank and a second drain port opening toward the anaerobic tank, the pre-denitrification tank has a first connecting port communicating with the anaerobic tank, the anaerobic tank has a second connecting port communicating with the anoxic tank, the anoxic tank has a third connecting port communicating with the aerobic tank, the aerobic tank has a fourth connecting port communicating with the membrane tank, and a membrane assembly is provided in the membrane tank, the membrane assembly covers the bottom of the membrane tank, a filter outlet is provided on the side of the membrane assembly opposite to the fourth connecting port, and the filter outlet is connected to the discharge port, The sludge return pipeline is configured to extend from above the pre-denitrification tank to above the membrane tank and continue to extend toward the membrane module on the filtering inlet side of the membrane module to pass through the membrane module to reach the bottom of the membrane tank. The nitrification liquid reflux pipeline is arranged to extend from the upper part of the anoxic tank to the upper part of the aerobic tank and continue to extend toward the bottom of the aerobic tank and has a reflux inlet at the bottom of the aerobic tank.

2. The sewage treatment equipment according to claim 1, characterized in that: A first agitator is arranged at the bottom of the pre-denitrification tank on one side away from the anaerobic tank.

3. The sewage treatment equipment according to claim 2, characterized in that: A second agitator and a third agitator are respectively arranged at the bottom of one side of the anaerobic tank and the anoxic tank, wherein the second agitator is arranged on the side of the anaerobic tank close to the pre-denitrification tank, and the third agitator is arranged on the side of the anoxic tank close to the anaerobic tank.

4. The sewage treatment equipment according to claim 3, characterized in that: The aerobic pool further comprises a nitrification liquid reflux pump, which is arranged on a side of the aerobic pool adjacent to the anoxic pool, and an outlet of the pump is connected to a reflux inlet of the nitrification liquid reflux pipeline.

5. The sewage treatment equipment according to claim 4, characterized in that: The membrane pool further includes a sludge return pump, which is arranged at the bottom of the membrane pool and located on the filtration inlet side of the membrane module. The outlet of the sludge return pump is connected to the pipe inlet of the sludge return pipe located at the bottom of the membrane pool.

6. The sewage treatment equipment according to claim 5, characterized in that: The sewage treatment equipment further comprises a suction assembly, a water suction port of the suction assembly is connected to the filtration outlet of the membrane assembly in the membrane pool, and a water outlet of the suction assembly is connected to the discharge port.

7. The sewage treatment equipment according to claim 6, characterized in that: Aeration pipes are arranged at the bottom of the aerobic tank and the membrane tank, and the sewage treatment equipment further comprises a fan assembly, and an air outlet of the fan assembly is connected to the aeration pipes.

8. The sewage treatment equipment according to claim 7, characterized in that: The sewage treatment equipment further comprises a chemical cleaning tank, which is provided with a water replenishment port and a drug outlet port, wherein the water replenishment port is connected to the water outlet of the suction component, and the drug outlet port is connected to the filtration inlet of the membrane component in the membrane pool.

9. The sewage treatment equipment according to claim 8, characterized in that: The sewage treatment equipment also includes a phosphorus removal component, which is connected to the top of the membrane pool.

10. The sewage treatment equipment according to claim 9, characterized in that: The feed port is connected to a feed tank located outside the shell through a feed pipe, and the feed pipe extends from the feed port to the bottom of the feed tank.

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