Autotrophic total nitrogen removal sewage treatment system

Abstract

The utility model relates to the field of sewage treatment, and discloses an autotrophic total nitrogen removal sewage treatment system which comprises a reaction tank, an aeration disc, a sedimentation tank, a backwashing water tank, a water outlet tank, a water inlet pipe, a backwashing water pipe, an air pipe and the like. Because dead bacterial colonies or decomposition products of a denitrifying microorganism filter layer in the treatment tank can be continuously attached to filter materials of the filter layer along with the increase of treatment time, gaps among the filter materials are blocked, the flow rate of sewage passing through the filter materials is reduced, the speed is slowed down, the total nitrogen removal efficiency of microorganisms is continuously reduced, and the sewage treatment efficiency is improved. And finally, the effluent quality exceeds the standard. According to the invention, the filter material is scrubbed by mixing gas and water, so that attachments in the filter material are removed, the continuous production is ensured, the replacement period of the filter material is prolonged, and the use cost of the filter material is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an autotrophic total nitrogen removal sewage treatment system. Technical Background

[0002] Total nitrogen refers to the total content of various forms of inorganic and organic nitrogen in water. It is often used to indicate the degree of nutrient pollution in water bodies and is one of the important indicators for measuring water quality. Wastewater generated during industrial production often contains nitrogen. If the nitrogen content in the discharged water is high, it will cause eutrophication of the water body. Therefore, when industrial wastewater is discharged, it is necessary to reduce the total nitrogen content in the wastewater and remove a large amount of nitrogen. The general biological denitrification method is to add a carbon source externally to make the C / N in the wastewater reach a corresponding ratio, and then use a series of reactions such as nitrification and denitrification of microorganisms to convert ammonia nitrogen in the wastewater into nitrogen gas, thereby achieving the purpose of wastewater treatment.

[0003] As a new denitrification process that has developed rapidly in recent years, autotrophic denitrification technology has attracted the attention of researchers in the field of biological denitrification of wastewater all over the world. Compared with traditional nitrification and denitrification, this process can save 60% of oxygen supply energy and 100% of organic carbon source addition, so it is considered to be the most economical and effective way to biologically denitrify wastewater. In the traditional autotrophic denitrification process, denitrifying microorganisms are gathered in the reaction tank, and nitrite and nitrate are reduced to nitrogen gas through their denitrification to achieve the purpose of denitrification and nitrogen reduction.

[0004] As the treatment time of the denitrifying microbial filter layer in the treatment pool increases, its dead bacterial colonies or decomposition products will continue to adhere to the filter material of the filter layer, thereby blocking the gaps between the filter materials, causing the flow rate of sewage through the filter material to decrease and the rate to slow down, and the efficiency of microorganisms in removing total nitrogen continues to decrease, eventually resulting in conditions such as effluent water quality exceeding the standard. To address this problem, the common method is to replace the filter material of the reaction tank in a timely manner, but this method will not only affect the normal production of sewage treatment, or even stop production, but also cause unnecessary waste of manpower and materials due to frequent replacement of filter materials. Summary of the invention

[0005] In order to solve the above problems, the utility model proposes an autotrophic total nitrogen removal sewage treatment system to achieve the purpose of reducing the maintenance cost of filter materials, ensuring the continuity of sewage treatment, and improving the stability of nitrogen removal efficiency.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an autotrophic total nitrogen removal sewage treatment system, comprising a reaction tank (1), an aeration plate (2), a filter material A (4), a filter material B (5), a sedimentation tank (6), a backwash water tank (7), a water outlet tank (8), a water inlet pipe (12), a backwash water pipe (14), and an air duct (18); the reaction tank (1) is an integral steel structure or a concrete civil engineering structure; a layer of aeration plates (2) is evenly arranged at the bottom of the reaction tank (1); a filter material support (3) is provided in the middle of the reaction tank (1); a layer of filter material A (4) and a layer of filter material B (5) are sequentially filled above the filter material support (3) from bottom to top; a sedimentation tank (6) is provided at the rear of the reaction tank (1); A backwash water tank (7) is provided at the rear of the backwash water tank (7), a water outlet tank (8) is provided at the rear of the backwash water tank (7), a water outlet pipe (9) is provided at the upper position of the rear end of the water outlet tank (8), an emptying pipe (10) and an emptying valve (11) are provided at the bottom side positions of the sedimentation tank (6), the backwash water tank (7) and the water outlet tank (8), an inlet pipe (12) is communicated with the bottom of the reaction tank (1), an inlet valve (13) and a booster pump (16) are installed on the inlet pipe (12), a backwash water pipe (14) is communicated with the backwash water tank (7) and the inlet pipe (12), a backwash valve (15) is installed on the backwash water pipe (14), an air pipe (18) is communicated with an aeration disk (2) in the reaction tank (1), and a Roots blower (17) and an air intake valve (19) are installed on the air pipe (18).

[0007] The aeration disc (2) is installed at a position 0.3-1.5 m below the filter material support (3), and a plurality of aeration discs (2) are evenly arranged at the bottom of the reaction tank (1). The aeration discs (2) are interconnected through pipelines and are connected to the air duct (18). The advantage of this is that the high-speed airflow generated by the Roots blower (17) is evenly distributed, preventing the airflow from generating dead corners when passing through the filter material A (4) and the filter material B (5).

[0008] The water inlet of the booster pump (16) is connected to the backwash water pipe (14) and the water inlet pipe (12) at the same time. The backwash water pipe (14) is provided with a backwash valve (15), and the water inlet pipe (12) is provided with a water inlet valve (13). The advantage of this is that when the system does not take in water for a long time, the backwash valve (15) is opened by switching the valves, the water in the backwash water tank (7) is closed, the booster pump (16) is turned on, and the filter material A (4) and the filter material B (5) are regularly washed with water to prevent the filter material from being hardened.

[0009] The bottom of the reaction tank (1) is connected to a water inlet pipe (12) and an air duct (18), and they are controlled separately by a water inlet valve (13) and an air inlet valve (19). The advantage of this is that when water is inletted, the Roots blower (17) and the air inlet valve (19) are turned on to scrub the filter material A (4) and the filter material B (5) with a mixture of air and water, which greatly improves the ability to remove the attached matter in the filter material. The filter material can be cleaned without stopping production, which ensures the continuity of production, and at the same time prolongs the replacement cycle of the filter material, saving the use cost of the filter material.

[0010] The backwash water pipe (14) in the backwash water tank (7) is 0.5-0.8m higher than the bottom of the backwash water tank (7), and the backwash water tank (7) is connected to the bottom of the reaction tank (1) through the backwash water pipe (14), the backwash valve (15), and the booster pump (16). The advantage of this is that most of the active sludge is suspended in the middle of the water body when passing through the backwash water tank (7), and a part of the active sludge can be returned to the reaction tank (1) by regularly opening the backwash valve (15), thereby ensuring a suitable sludge concentration and improving the system's denitrification capacity, shock load resistance, and effluent stability.

[0011] The bottom of the sedimentation tank (6), backwash tank (7) and outlet tank (8) is provided with a slope of 3-10°, and the lowest position of the bottom is connected to the drain pipe (10) through the drain valve (11). The advantage of this is that the inactivated sludge is precipitated at the bottom of the tank body, and the sludge can be prevented from aging and salt accumulation by regular sludge discharge.

[0012] The beneficial effects of the utility model are as follows: air is conveyed into the air duct (18) by the Roots blower (17), and then discharged after being evenly distributed by the aeration plate (2), thereby aerating the sewage in the reaction tank (1). At the same time, the sewage passes through two layers of filter materials from bottom to top in sequence, and the autotrophic denitrifying microorganisms in the filter materials decompose the nitrate and nitrite in the sewage, thereby reducing the total nitrogen concentration in the sewage and the eutrophication degree of ammonia nutrient salts, thereby deammonifying the sewage. At the same time, the flushing effect of air flow and water flow is used to clean the attachments on the filter materials, thereby ensuring the flux and flow rate of the sewage and guaranteeing the denitrification treatment effect. The utility model has strong practicality, high promotion value, and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural elevation view of the equipment of the present utility model.

[0014] Figure 2 It is a plan view of the equipment structure of the utility model.

[0015] Wherein: (1) reaction tank, (2) aeration plate, (3) filter material support, (4) filter material A, (5) filter material B, (6) sedimentation tank, (7) backwash water tank, (8) outlet water tank, (9) outlet pipe, (10) drain pipe, (11) drain valve, (12) inlet pipe, (13) inlet valve, (14) backwash water pipe, (15) backwash valve, (16) booster pump, (17) Roots blower, (18) air duct, (19) inlet valve. DETAILED DESCRIPTION

[0016] In order to have a further understanding and recognition of the structural features and the effects achieved by the utility model, a preferred embodiment and accompanying drawings are used to illustrate the invention as follows:

[0017] As shown in FIG. (1), an autotrophic total nitrogen removal sewage treatment system comprises a reaction tank (1), an aeration plate (2), filter material A (4), filter material B (5), a sedimentation tank (6), a backwash water tank (7), an outlet tank (8), a water inlet pipe (12), a backwash water pipe (14), and an air duct (18). The reaction tank (1) is an integral steel structure or a concrete civil engineering structure. A layer of aeration plates (2) is evenly arranged at the bottom of the reaction tank (1). A filter material support (3) is provided in the middle of the reaction tank (1). A layer of filter material A (4) and a layer of filter material B (5) are sequentially filled above the filter material support (3) from bottom to top. A sedimentation tank (6) is provided at the rear of the reaction tank (1). A backwash water pipe (14) is provided at the rear of the sedimentation tank (6). A water tank (7) is provided with a water outlet tank (8) at the rear of the backwash water tank (7), a water outlet pipe (9) is provided at the upper position of the rear end of the water outlet tank (8), an emptying pipe (10) and an emptying valve (11) are provided at the bottom side positions of the sedimentation tank (6), the backwash water tank (7) and the water outlet tank (8), an inlet pipe (12) is connected to the bottom of the reaction tank (1), an inlet valve (13) and a booster pump (16) are installed on the inlet pipe (12), a backwash water pipe (14) is connected to the backwash water tank (7) and the inlet pipe (12), a backwash valve (15) is installed on the backwash water pipe (14), an air pipe (18) is connected to an aeration disk (2) in the reaction tank (1), and a Roots blower (17) and an air inlet valve (19) are installed on the air pipe (18).

[0018] In this embodiment, the aeration plate (2) is installed at a position 0.8 m below the filter material support (3), and multiple aeration plates (2) are evenly arranged at the bottom of the reaction tank (1). The aeration plates (2) are interconnected through pipes and connected to the air duct (18).

[0019] In this embodiment, the water inlet of the booster pump (16) is connected to the backwash water pipe (14) and the water inlet pipe (12) at the same time. The backwash water pipe (14) is provided with a backwash valve (15), and the water inlet pipe (12) is provided with a water inlet valve (13).

[0020] In this embodiment, the bottom of the reaction tank (1) is connected to a water inlet pipe (12) and an air duct (18) at the same time, and is independently controlled by a water inlet valve (13) and an air inlet valve (19), respectively.

[0021] In this embodiment, the backwash water pipe (14) in the backwash water tank (7) is 0.5 m higher than the bottom of the backwash water tank (7), and the backwash water tank (7) is connected to the bottom of the reaction tank (1) through the backwash water pipe (14), the backwash valve (15), and the booster pump (16).

[0022] In this embodiment, the bottom of the sedimentation tank (6), the backwash tank (7), and the outlet tank (8) is provided with a slope of 5°, and the lowest position of the bottom is connected to the drain pipe (10) through the drain valve (11).

[0023] The above-mentioned embodiment treats 20000m3 of water. 3 / d, and currently they are running stably with good results.

[0024] Attached below are the inlet and outlet water quality test data during the sewage treatment operation of this embodiment.

[0025]

[0026] Statement content: The above embodiments are only used to illustrate the equipment structure involved in the utility model, rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, relevant personnel in the field should understand that it is allowed to modify and adjust the equipment structure of the utility model within a reasonable range without departing from the essence and scope of the technology of the utility model.

Claims

1. An autotrophic total nitrogen removal sewage treatment system, characterized in that: The invention comprises a reaction tank (1), an aeration plate (2), a filter material A (4), a filter material B (5), a sedimentation tank (6), a backwash water tank (7), a water outlet tank (8), a water inlet pipe (12), a backwash water pipe (14), and an air duct (18). The reaction tank (1) is an integral steel structure or a concrete civil engineering structure. A layer of aeration plates (2) is evenly arranged at the bottom of the reaction tank (1). A filter material support (3) is provided in the middle of the reaction tank (1). A layer of filter material A (4) and a layer of filter material B (5) are sequentially filled above the filter material support (3) from bottom to top. A sedimentation tank (6) is provided at the rear of the reaction tank (1). A backwash water tank (7) is provided at the rear of the sedimentation tank (6). A water outlet tank (8) is provided at the rear of the reaction tank (7), a water outlet pipe (9) is provided at the upper rear end of the water outlet tank (8), an emptying pipe (10) and an emptying valve (11) are provided at the bottom side of the sedimentation tank (6), the backwash water tank (7) and the water outlet tank (8), a water inlet pipe (12) is connected to the bottom of the reaction tank (1), a water inlet valve (13) and a booster pump (16) are installed on the water inlet pipe (12), a backwash water pipe (14) is connected to the backwash water tank (7) and the water inlet pipe (12), a backwash valve (15) is installed on the backwash water pipe (14), an air duct (18) is connected to the aeration disk (2) in the reaction tank (1), and a Roots blower (17) and an air inlet valve (19) are installed on the air duct (18).

2. The autotrophic total nitrogen removal sewage treatment system according to claim 1, characterized in that: The aeration disc (2) is installed at a position 0.3-1.5 m below the filter material support (3). A plurality of aeration discs (2) are evenly arranged at the bottom of the reaction tank (1). The aeration discs (2) are interconnected through pipes and are connected to the air duct (18).

3. The autotrophic total nitrogen removal sewage treatment system according to claim 1, characterized in that: The water inlet of the booster pump (16) is connected to the backwash water pipe (14) and the water inlet pipe (12) at the same time. The backwash water pipe (14) is provided with a backwash valve (15), and the water inlet pipe (12) is provided with a water inlet valve (13).

4. The autotrophic total nitrogen removal sewage treatment system according to claim 1, characterized in that: The bottom of the reaction tank (1) is connected to a water inlet pipe (12) and an air duct (18) at the same time, and is independently controlled by a water inlet valve (13) and an air inlet valve (19) respectively.

5. The autotrophic total nitrogen removal sewage treatment system according to claim 1, characterized in that: The backwash water pipe (14) in the backwash water tank (7) is 0.5-0.8 m higher than the bottom of the backwash water tank (7), and the backwash water tank (7) is connected to the bottom of the reaction tank (1) through the backwash water pipe (14), the backwash valve (15) and the booster pump (16).

6. The autotrophic total nitrogen removal sewage treatment system according to claim 1, characterized in that: The sedimentation tank (6), the backwash water tank (7) and the water outlet tank (8) have a bottom with a slope of 3-10 degrees, and the lowest position of the bottom is connected to the drain pipe (10) after passing through the drain valve (11).

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