Plateau region denitrification improvement AAO process sewage treatment system

Abstract

The utility model relates to a plateau region denitrification improvement AAO process sewage treatment system, and relates to the technical field of sewage treatment, the plateau region denitrification improvement AAO process sewage treatment system comprises a pretreatment tank, an AAO reaction tank, a solid-liquid separation tank and a sludge backflow tank which are connected in sequence; the AAO reaction tank comprises an anaerobic zone, an anoxic zone and an aerobic zone which are sequentially arranged, the AAO reaction tank is provided with a heat preservation device, the heat preservation device comprises a first heat preservation layer arranged in the anaerobic zone, a second heat preservation layer arranged in the anoxic zone and a third heat preservation layer arranged in the aerobic zone, the first heat preservation layer is communicated with the second heat preservation layer, and the second heat preservation layer is communicated with the third heat preservation layer; and the heating device is communicated with the first heat preservation layer. The method has the effect of improving the adaptability and efficiency of microbiological treatment in a plateau area sewage treatment system.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage treatment system using a denitrification-modified AAO process in plateau areas. Background Art

[0002] The unique environmental characteristics of the Qinghai-Tibet Plateau, such as high altitude, large temperature difference between day and night, and strong solar radiation, have a significant impact on the performance of concrete, thereby affecting the construction of sewage treatment systems.

[0003] Existing wastewater treatment technologies primarily include physical, chemical, and biological treatment. Biological treatment is widely adopted due to its low cost and ease of operation. Generally, microbial decomposition in biological treatment methods can be categorized into three distinct treatment methods: anaerobic, aerobic, and facultative. Appropriate bacterial species are selected to achieve efficient degradation of organic matter in wastewater.

[0004] Regarding the aforementioned technologies, due to the unique environmental conditions in plateau regions, such as low temperature, low pressure, and large temperature swings between day and night, the microbial activity of traditional biological treatment methods is significantly inhibited, resulting in low organic matter decomposition efficiency and significantly affecting wastewater treatment effectiveness. Therefore, improving the adaptability and efficiency of microbial treatment in wastewater treatment systems in plateau regions has become a pressing issue. Utility Model Content

[0005] In order to improve the adaptability and efficiency of microbial treatment in the sewage treatment system in the original area, the present application provides a denitrification improved AAO process sewage treatment system in the plateau area.

[0006] This application provides a denitrification improved AAO process sewage treatment system for plateau areas, which adopts the following technical solutions:

[0007] A denitrification improved AAO process sewage treatment system in plateau areas, characterized by comprising a pretreatment tank, an AAO reaction tank, a solid-liquid separation tank and a sludge return tank connected in sequence;

[0008] The AAO reaction tank includes an anaerobic zone, an anoxic zone, and an aerobic zone arranged in sequence. The AAO reaction tank is provided with a heat preservation device, which includes a first heat preservation layer provided in the anaerobic zone, a second heat preservation layer provided in the anoxic zone, and a third heat preservation layer provided in the aerobic zone. The first heat preservation layer is connected to the second heat preservation layer, and the second heat preservation layer is connected to the third heat preservation layer.

[0009] It also includes a heating device, which is connected to the first insulation layer.

[0010] By adopting the above technical solution, before sewage treatment, due to the low temperature in the plateau area and the large temperature difference between day and night, the growth rate of microorganisms will be affected, further affecting the effect of sewage treatment. By setting up a heat preservation device, the AAO reaction tank is regulated by the heat preservation device to ensure that the temperature remains constant, further improving the decomposition and purification function of microorganisms in sewage treatment. The sewage enters the pretreatment tank to remove large particles of suspended matter, drift and other impurities in the sewage. The sewage enters the anaerobic zone in the AA reaction tank to release phosphorus in the sewage. The anoxic zone in the AAO reaction tank decomposes the large molecular organic matter in the sewage that is difficult to indirectly decompose into small molecular organic matter, and releases phosphorus into the water body. The aerobic zone completely oxidizes and decomposes the organic matter in the sewage. The sewage after oxidation and decomposition enters the solid-liquid separation zone, and realizes mud-water separation by sedimentation. The sludge return tank returns part of the activated sludge from the solid-liquid separation tank to the aerobic zone to maintain a sufficient amount of microorganisms in the aerobic zone.

[0011] Optionally, the heating device includes a first heating water distribution pipe and a first heating element, one end of the first heating water distribution pipe is connected to the first insulation layer, and the first heating element is connected to the first heating water distribution pipe.

[0012] By adopting the above technical solution, in order to heat the first insulation layer, a first heating water distribution pipe and a first heating element are set up, and the first heating element heats the first heating water distribution pipe. The heated water flows into the first insulation layer and further flows to the second insulation layer and the third insulation layer.

[0013] Optionally, the heating device further includes a second heating water distribution pipe and a second heating element, one end of the second heating water distribution pipe is connected to the third insulation layer, and the second heating element is connected to the second heating water distribution pipe.

[0014] By adopting the above technical solution, although the first insulation layer, the second insulation layer and the third insulation layer are interconnected, since the temperature transfer takes time, in order to further quickly maintain the temperature in the anaerobic zone, the anoxic zone and the aerobic zone constant, a second heating water distribution pipe and a second heating element are provided, and the second heating element heats the third insulation layer through the second heating distribution pipe, and the first insulation layer transfers the water flow to the second insulation layer through the first pipe, and the third insulation layer transfers the water flow to the second insulation layer through the second pipe, so that the heated water can achieve heat exchange in the first insulation layer, the second insulation layer and the third insulation layer, thereby realizing rapid conduction of the heated water and ensuring that the temperature of the first insulation layer, the second insulation layer and the third insulation layer can be quickly maintained constant.

[0015] Optionally, the heating device also includes a heating main water pipe, one end of which is connected to the end of the first heating water distribution pipe away from the first insulation layer, and the other end is connected to the end of the second heating water distribution pipe away from the second insulation layer, and a circulation pump is provided on the heating main water pipe.

[0016] By adopting the above technical solution, by setting up a heating main water pipe, water flows through the first heating water branch pipe, the first insulation layer, the first pipeline, the second insulation layer, the second pipeline, the third insulation layer, the second heating water branch pipe and the heating main water pipe to form a water flow loop, thereby realizing heat transfer of circulating water

[0017] Optionally, temperature detectors are provided in the anaerobic zone, the anoxic zone and the aerobic zone.

[0018] By adopting the above technical solution and setting up a temperature detector, personnel can observe the temperature conditions in the anaerobic zone, anoxic zone and aerobic zone in the AAO reaction tank.

[0019] Optionally, it further includes a water inlet pipe, the water inlet end of which is connected to the first heating water distribution pipe and / or the second heating water distribution pipe, and the first heating water distribution pipe and / or the second heating water distribution pipe are provided with valves.

[0020] By adopting the above technical solution, a water inlet pipe is set up, and water enters the first heating water distribution pipe from the water inlet pipe. After the water flow forms a circulation loop, the valve can be closed.

[0021] Optionally, a filter element is provided in the first heating water distribution pipe and the second heating water distribution pipe.

[0022] By adopting the above technical solution, if there are too many impurities in the water of the first heating water distribution pipe, they will adhere to the wall of the first heating water distribution pipe, which will affect the insulation effect of the first heating water distribution pipe. By setting a filter element, the impurities in the water can be filtered.

[0023] Optionally, one end of the heating main water pipe is detachably connected to the first heating branch water pipe, and the other end is detachably connected to the second heating pipe.

[0024] By adopting the above technical solution, in order to facilitate personnel to remove the filter for cleaning or replacement, one end of the heating main water pipe is detachably connected to the first heating branch water pipe, and the other end is detachably connected to the second heating pipe.

[0025] Optionally, both the anoxic zone and the aerobic zone are provided with aeration devices.

[0026] By adopting the above technical solution, an aeration device is set in the anoxic zone and the aerobic zone. The aeration device allows air to be introduced into the anoxic zone and the aerobic zone, thereby achieving the dissolution and transfer of oxygen, which helps to provide sufficient dissolved oxygen for the anoxic zone and the aerobic zone, thereby promoting their oxidation and decomposition of organic matter in the sewage.

[0027] Optionally, a sludge return pipe is further included, one end of which is connected to the solid-liquid separation tank, and the other end of which is connected to the aerobic zone.

[0028] By adopting the above technical solution, a sludge return pipe is set up, and the sewage after oxidation and decomposition enters the solid-liquid separation area, and the mud and water are separated by sedimentation. The sludge return tank returns part of the activated sludge from the solid-liquid separation tank to the aerobic area to maintain sufficient microbial mass in the aerobic area.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. This application provides balanced heating and insulation for the AAO reaction tank by installing a first insulation layer, a second insulation layer, and a third insulation layer in the anaerobic zone, anoxic zone, and aerobic zone, respectively. The lower temperature in plateau areas reduces microbial activity and affects microbial growth. The installation of insulation devices ensures a constant temperature, further enhancing the decomposition and purification effects of microorganisms in sewage treatment.

[0031] 2. This application sets up an insulation device and a heating device to form a water flow loop among the first heating water distribution pipe, the first insulation layer, the first pipeline, the second insulation layer, the second pipeline, the third insulation layer, the second heating water distribution pipe and the heating main water pipe, thereby realizing heat transfer of the circulating water and ensuring that the first insulation layer, the second insulation layer and the third insulation layer can quickly realize temperature conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall structure of a denitrification improved AAO process sewage treatment system in plateau areas of the present application;

[0033] Figure 2 It is a structural diagram of the heat preservation device of the present application;

[0034] Figure 3 It is a structural schematic diagram of the heating device of the present application;

[0035] Figure 4 It is a structural diagram of the filter element and heating device of this application.

[0036] Explanation of the accompanying symbols: 1. Pretreatment tank; 2. AAO reaction tank; 21. Anaerobic zone; 22. Anoxic zone; 23. Aerobic zone; 24. Temperature detector; 25. Aeration device; 3. Solid-liquid separation tank; 4. Sludge return tank; 41. Sludge return pipe; 5. Insulation device; 51. First insulation layer; 511. First pipeline; 52. Second insulation layer; 521. Second pipeline; 53. Third insulation layer; 6. Heating device; 61. First heating water distribution pipe; 611. First heating element; 62. Second heating water distribution pipe; 621. Second heating element; 63. Heating main water pipe; 631. Circulation pump; 7. Water inlet pipe; 71. Valve; 8. Filter element. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-4 This application is described in further detail.

[0038] The present application discloses a denitrification improved AAO process sewage treatment system in plateau areas. Figure 1 The denitrification improved AAO process sewage treatment system in the plateau area includes a pretreatment tank 1, an AAO reaction tank 2, a solid-liquid separation tank 3 and a sludge return tank 4. The AAO reaction tank 2 includes an anaerobic zone 21, an anoxic zone 22 and an aerobic zone 23 arranged in sequence. The AAO reaction tank 2 is provided with an insulation device 5. The insulation device 5 includes a first insulation layer 51 provided in the anaerobic zone 21, a second insulation layer 52 provided in the anoxic zone 22 and a third insulation layer 53 provided in the aerobic zone 23. The first insulation layer 51 is connected to the second insulation layer 52, and the second insulation layer 52 is connected to the third insulation layer 53.

[0039] Reference Figure 1 The sludge passes through the pretreatment tank 1, AAO reaction tank 2, solid-liquid separation tank 3 and sludge return tank 4 in sequence. The pretreatment tank 1 performs preliminary treatment on the sewage. The pretreatment tank 1 is equipped with grids, screens, etc. to remove large particles of suspended solids, drift matter and other impurities in the sewage. The sewage enters the anaerobic zone 21 in the AAO reaction tank to release phosphorus in the sewage. The anoxic zone 22 in the AAO reaction tank 2 decomposes the large molecular organic matter in the sewage that is difficult to indirectly decompose into small molecular organic matter, and releases phosphorus into the water body. The aerobic zone 23 completely oxidizes and decomposes the organic matter in the sewage. The sewage after oxidation and decomposition enters the solid-liquid separation zone, and mud and water separation is achieved by sedimentation. The sludge return tank 4 returns part of the activated sludge from the solid-liquid separation tank 3 to the aerobic zone 23 to maintain sufficient microbial biomass in the aerobic zone 23.

[0040] Reference Figure 1 In order to transfer the sludge in the sludge return tank 4 to the aerobic zone 23, the plateau denitrification improved AAO process sewage treatment system also includes a sludge return pipe 41, one end of the sludge return pipe 41 is connected to the solid-liquid separation tank 3, and the other end is connected to the aerobic zone 23.

[0041] Reference Figure 2 The first insulation layer 51 is connected to the second insulation layer 52 through the first pipe 511, and the second insulation layer 52 is connected to the third insulation layer 53 through the second pipe 521. The heating device 6 is connected to the first insulation layer 51, and the first insulation layer 51 is heated by the heating device 6. The temperature is further conducted by the first pipe 511 and the second pipe 521. Since the temperature in the plateau area is low and the temperature difference between day and night is large, it will affect the growth rate of microorganisms and further affect the effect of sewage treatment. By setting the insulation device 5, the insulation device 5 can regulate the AAO reaction tank 2 to ensure that the temperature remains constant, thereby further improving the decomposition and purification effect of microorganisms in sewage treatment.

[0042] Reference Figure 3 In order to heat the first insulation layer 51, the plateau denitrification improved AAO process sewage treatment system also includes a heating device 6, which is connected to the first insulation layer 51, and the anaerobic zone 21, the anoxic zone 22 and the aerobic zone 23 are connected to realize the transportation of sewage. The heating device 6 includes a first heating water distribution pipe 61 and a first heating element 611. One end of the first heating water distribution pipe 61 is connected to the first insulation layer 51, and the first heating element 611 is connected to the first heating water distribution pipe 61. Water flows from the first heating water distribution pipe 61 to the insulation layer, and the first insulation layer 51 is heated by the first heating element 611 through the first heating water distribution pipe 61;

[0043] Reference Figure 3 Although the first insulation layer 51, the second insulation layer 52 and the third insulation layer 53 are interconnected, since the temperature transfer takes time, in order to further quickly maintain the temperature in the anaerobic zone 21, the anoxic zone 22 and the aerobic zone 23 constant, the heating device 6 also includes a second heating water distribution pipe 62 and a second heating element 621. One end of the second heating water distribution pipe 62 is connected to the third insulation layer 53, and the second heating element 621 is connected to the second heating water distribution pipe 62. The second heating element 621 heats the third insulation layer 53 through the second heating distribution pipe. The first insulation layer 51 transfers water to the second insulation layer 52 through the first pipe 511, and the third insulation layer 53 transfers water to the second insulation layer 52 through the second pipe 521, so that the heated water can achieve heat exchange among the first insulation layer 51, the second insulation layer 52 and the third insulation layer 53.

[0044] Reference Figure 3 In order to realize the thermal circulation of heated water, the heating device 6 also includes a heating main water pipe 63. One end of the heating main water pipe 63 is connected to the end of the first heating water distribution pipe 61 away from the first insulation layer 51, and the other end is connected to the end of the second heating water distribution pipe 62 away from the second insulation layer 52. A circulation pump 631 is provided on the heating main water pipe 63. When the circulation pump 631 is turned on, water flows through the first heating water distribution pipe 61, the first insulation layer 51, the first pipeline 511, the second insulation layer 52, the second pipeline 521, the third insulation layer 53, the second heating water distribution pipe 62 and the heating main water pipe 63 to form a water flow loop, thereby realizing heat transfer of circulating water.

[0045] Reference Figure 2 In order to detect the temperatures of the anaerobic zone 21 , the anoxic zone 22 and the aerobic zone 23 , temperature detectors 24 are provided in each of the anaerobic zone 21 , the anoxic zone 22 and the aerobic zone 23 .

[0046] Reference Figure 3In order to transport water into the first insulation layer 51, the plateau denitrification improved AAO process sewage treatment system also includes a water inlet pipe 7, the water inlet end of the water inlet pipe 7 is connected to the first heating water distribution pipe 61 and / or the second heating water distribution pipe 62, and the first heating water distribution pipe 61 and / or the second heating water distribution pipe 62 is provided with a valve 71. In this embodiment, the water inlet end of the water inlet pipe 7 is connected to the first heating water distribution pipe 61, and the water inlet pipe 7 is provided with a valve 71.

[0047] Reference Figure 4 During long-term use, in order to prevent excessive impurities in the water of the first heating water distribution pipe 61 from adhering to the wall of the first heating water distribution pipe 61, which will affect the insulation effect of the first heating water distribution pipe 61, a filter element 8 is provided in the first heating water distribution pipe 61 and the second heating water distribution pipe 62. In this embodiment, the filter element 8 is a filter mesh, so that the filter element 8 can filter impurities in the water.

[0048] Reference Figure 3 In order to facilitate personnel to remove the filter element 8 for cleaning, one end of the heating main water pipe 63 is detachably connected to the first heating water branch pipe 61, and the other end is detachably connected to the second heating water branch pipe 62.

[0049] Reference Figure 3 In order to further accelerate the contact between microorganisms and dissolved oxygen and improve the reaction efficiency, the anoxic zone 22 and the aerobic zone 23 are both provided with an aeration device 25. The aeration device 25 allows air to be introduced into the anoxic zone 22 and the aerobic zone 23, thereby achieving the dissolution and transfer of oxygen, which helps to provide sufficient dissolved oxygen for the anoxic zone 22 and the aerobic zone 23, thereby promoting their oxidation and decomposition of organic matter in the sewage.

[0050] The implementation principle of the denitrification improved AAO process sewage treatment system in plateau areas according to the embodiment of the present application is as follows: before sewage treatment, the valve 71 is opened to allow water to enter the first heating water distribution pipe 61 from the water inlet pipe 7, and further form a loop through the first insulation layer 51, the second insulation layer 52, the third insulation layer 53, the second heating water distribution pipe 62 and the heating main pipe. The first insulation layer 51, the second insulation layer 52 and the third insulation layer 53 are heated by the first heating element 611 and the second heating element 621 to ensure constant temperature, thereby further improving the decomposition and purification effect of microorganisms in sewage treatment. The sewage passes through the pretreatment tank 1, the AAO reaction tank 2, the solid-liquid separation tank 3 and the sludge return tank 4. The sludge in the sludge return tank 4 further enters the anaerobic zone 21 through the sludge return pipe 41.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A denitrification improved AAO process sewage treatment system in plateau areas, characterized by: It comprises a pretreatment tank (1), an AAO reaction tank (2), a solid-liquid separation tank (3) and a sludge return tank (4) which are connected in sequence; The AAO reaction tank (2) comprises an anaerobic zone (21), an anoxic zone (22) and an aerobic zone (23) which are arranged in sequence. The AAO reaction tank (2) is provided with a heat preservation device (5). The heat preservation device (5) comprises a first heat preservation layer (51) provided in the anaerobic zone (21), a second heat preservation layer (52) provided in the anoxic zone (22) and a third heat preservation layer (53) provided in the aerobic zone (23). The first heat preservation layer (51) is connected to the second heat preservation layer (52), and the second heat preservation layer (52) is connected to the third heat preservation layer (53). It also includes a heating device (6), and the heating device (6) is connected to the first thermal insulation layer (51).

2. The denitrification improved AAO process sewage treatment system for plateau areas according to claim 1 is characterized by: The heating device (6) comprises a first heating water distribution pipe (61) and a first heating element (611); one end of the first heating water distribution pipe (61) is connected to the first thermal insulation layer (51); and the first heating element (611) is connected to the first heating water distribution pipe (61).

3. The denitrification improved AAO process sewage treatment system for plateau areas according to claim 2 is characterized by: The heating device (6) further comprises a second heating water distribution pipe (62) and a second heating element (621), wherein one end of the second heating water distribution pipe (62) is connected to the third heat-insulating layer (53), and the second heating element (621) is connected to the second heating water distribution pipe (62).

4. A plateau denitrification improved AAO process sewage treatment system according to claim 3, characterized in that: The heating device (6) further comprises a heating main water pipe (63), one end of the heating main water pipe (63) being connected to an end of the first heating water branch pipe (61) away from the first thermal insulation layer (51), and the other end being connected to an end of the second heating water branch pipe (62) away from the second thermal insulation layer (52), and a circulating pump (631) being provided on the heating main water pipe (63).

5. The denitrification improved AAO process sewage treatment system in plateau areas according to claim 1 is characterized by: The anaerobic zone (21), the anoxic zone (22) and the aerobic zone (23) are all provided with temperature detectors (24).

6. The denitrification improved AAO process sewage treatment system for plateau areas according to claim 4 is characterized by: It also includes a water inlet pipe (7), the water inlet end of the water inlet pipe (7) is connected to the first heating water distribution pipe (61) and / or the second heating water distribution pipe (62), and the first heating water distribution pipe (61) and / or the second heating water distribution pipe (62) are provided with a valve (71).

7. The denitrification improved AAO process sewage treatment system for plateau areas according to claim 4 is characterized by: Filter elements (8) are provided in the first heating water distribution pipe (61) and the second heating water distribution pipe (62).

8. The denitrification improved AAO process sewage treatment system for plateau areas according to claim 7, characterized in that: One end of the heating main water pipe (63) is detachably connected to the first heating water branch pipe (61), and the other end is detachably connected to the second heating water branch pipe (62).

9. The denitrification improved AAO process sewage treatment system in plateau areas according to claim 1, characterized in that: Aeration devices (25) are provided in both the anoxic zone (22) and the aerobic zone (23).

10. The denitrification improved AAO process sewage treatment system in plateau areas according to claim 1, characterized in that: It also includes a sludge return pipe (41), one end of which is connected to the solid-liquid separation tank (3), and the other end of which is connected to the aerobic zone (23).

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