Sewage treatment device

Abstract

The utility model discloses a sewage treatment device. Comprising a reaction shell, a water outlet channel for discharging treated water is arranged on the inner side of the upper part of the reaction shell; a water inlet pipe for feeding sewage is arranged at the bottom of the reaction shell; a perforated plate for supporting filler balls is arranged above the water inlet pipe, and the filler balls inoculated with activated sludge are arranged on the perforated plate; and an aeration pipe is arranged in the reaction shell on the lower side of the water inlet pipe. According to the utility model, the problem of maintenance of high-concentration sludge is solved, the concentration of sludge in the aeration tank can be effectively improved, the concentration of activated sludge in the aeration tank is not limited by hydraulic retention time and sludge discharge cycle, and meanwhile, due to more sludge anoxic and anaerobic zones arranged in the sludge maintenance device, the denitrification reaction is more facilitated, and the denitrification efficiency is improved. Therefore, the total nitrogen removal effect is better.

Description

Technical Field

[0001] The utility model relates to a filler ball used for maintaining high-concentration activated sludge in an aeration tank and a sewage treatment device. Background Art

[0002] The activated sludge method is one of the most widely used sewage treatment technologies. However, in the actual application of the activated sludge method, there is a problem of mismatch between the hydraulic retention time and the sludge age of the activated sludge. Therefore, in order to maintain a high activated sludge concentration in the activated sludge system, a sludge return system is often required. This not only wastes energy, but also the activated sludge is still easy to lose, making it difficult to maintain the sludge concentration and volumetric load at a high level, which restricts the improvement of sewage treatment efficiency.

[0003] In view of the problem that the sludge concentration and volume load in the sewage treatment aeration tank are difficult to maintain at a high level, the prior art often adopts biofilm technology or immobilized microorganism technology to increase the activated sludge concentration in the aeration tank. However, due to the superposition of hydraulic shear force in the aeration tank and the interaction force between microorganisms and fillers, it is difficult to form a too thick biofilm in the biofilm method, thereby limiting the increase of sludge concentration in the aeration tank. The existing immobilization technology has harsh reaction conditions and a long sludge startup time, and there are difficulties in practical application. In view of the above problems, the utility model provides a high-concentration activated sludge filler ball and a sewage treatment device, which inoculates high-concentration activated sludge into the filler ball, realizes the fixation of sludge, saves the sludge return system, avoids sludge loss, and can effectively increase the sludge concentration and volume load in the aeration tank; at the same time, since the sludge in the device is fixed in the filler ball, an anoxic zone can be formed inside to provide an anoxic environment for denitrification, and the coupling of the external aerobic zone and the internal anoxic zone can realize the simultaneous nitrification and denitrification, thereby effectively improving the removal efficiency of total nitrogen. Utility Model Content

[0004] In order to overcome the above-mentioned defects, the purpose of the utility model is to provide a sewage treatment device.

[0005] To achieve the above-mentioned purpose, the sewage treatment device of the utility model comprises: a reaction shell; a water outlet channel for discharging treated water is arranged on the inner side of the upper part of the reaction shell; a water inlet pipe for taking in sewage is arranged at the bottom of the reaction shell; a porous plate for supporting filler balls is arranged above the water inlet pipe, and filler balls inoculated with activated sludge are arranged on the porous plate; an aeration pipe is arranged in the reaction shell at the lower side of the water inlet pipe.

[0006] Furthermore, the filler ball is composed of a mesh frame, a microfiltration membrane outer shell and a polyurethane filler filled inside, and an activated sludge injection nozzle is arranged on the filler ball.

[0007] Furthermore, the mesh skeleton is used as a supporting skeleton of the microfiltration membrane jacket, and the microfiltration membrane jacket is made of filter cloth or a material with a microfiltration aperture, and is filled with polyurethane filler inside, with a filling rate of 30%-60%.

[0008] Furthermore, the activated sludge injection nozzle is composed of an elastic rubber ring head and a duckbill tail, and the total length of the injection nozzle does not exceed the radius of the filler ball.

[0009] Furthermore, a mud discharge channel for discharging excess sludge is provided at the lower outer portion of the reaction shell, and a mud discharge valve is provided on the reaction shell corresponding to the mud discharge channel.

[0010] Furthermore, the water inlet pipe is designed to be wheel-shaped, and holes are evenly opened on the water inlet pipe.

[0011] Furthermore, the filler balls in the reaction shell account for 50%-60% of the total volume, and the pore size of the porous plate supporting the filler balls is smaller than the diameter of the filler balls.

[0012] Furthermore, the aeration pipe is a rubber membrane aerator, which is evenly distributed at the bottom of the reaction device.

[0013] Furthermore, the activated sludge injected into the filler balls is the residual sludge in the secondary sedimentation tank or the artificially domesticated sludge.

[0014] The utility model has the following beneficial effects:

[0015] (1) The utility model solves the problem of maintaining high-concentration sludge, and can effectively increase the sludge concentration in the aeration tank, so that the concentration of activated sludge in the aeration tank is not limited by the hydraulic retention time and the sludge discharge cycle. At the same time, when the sludge concentration in the device changes, the sludge concentration in the aeration tank can be controlled at an appropriate level by adding or removing filler balls. The ordinary activated sludge method can only maintain the sludge concentration at about 3000 mg / L, and the device of the utility model can maintain the sludge concentration at more than 10000 mg / L. At the same time, since there are more sludge anoxic and anaerobic zones in the sludge maintenance device, it is more conducive to the occurrence of denitrification reaction, so the total nitrogen removal effect is better.

[0016] (2) The packing ball is made of a mesh frame, a microfiltration membrane jacket and a polyurethane filler filled inside, which can ensure that sewage and air can enter the packing ball smoothly. The air entering the packing is broken into tiny bubbles under the action of the mesh, so that it can fully contact the sludge and sewage, ensuring the mass transfer efficiency. It is difficult for sludge to pass through the microfiltration membrane jacket, so the loss phenomenon is effectively avoided.

[0017] (3) There are both muddy sludge and membrane sludge in the packing balls. The membrane sludge adheres to the polyurethane packing, and the muddy sludge is distributed in the packing balls. When the system is started, the muddy sludge is converted into membrane sludge, and the density of the packing balls increases continuously. Because the packing balls in the aeration tank are always in a fluidized state, the packing balls form hydraulic classification. The packing balls with high density are distributed to the lower part of the reaction device, and the packing balls with low density are distributed to the upper part of the reaction device. After the reactor has been running for a period of time, the amount of sludge in the system increases. When the residual sludge needs to be discharged, the sludge discharge port is opened from the lower part of the reaction device, and the density is increased. The large filler balls are discharged from the lower mud discharge port into the mud discharge channel. After the muddy sludge in the high-density filler is extracted, the density of the filler balls becomes smaller and is re-added to the reaction device. Under the action of hydraulic classification, it is transferred to the upper part of the reaction device. With the continuous operation of the reaction device, the membrane sludge becomes thicker and the force with the main body of the biofilm becomes smaller. The membrane sludge separates from the biofilm and is converted into muddy sludge. This cycle can ensure the continuous renewal of the sludge in the filler balls, enhance the biological activity of the activated sludge, and improve the sewage purification efficiency.

[0018] (4) The sludge in the device gathers in the packing balls to form a large number of anoxic zones, which provide reaction conditions and space for denitrification. Therefore, the effective removal of organic matter and total nitrogen can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view of an embodiment of the utility model;

[0020] Figure 2 This is the plan view of the aeration pipe;

[0021] Figure 3 This is the plan view of the water inlet pipe;

[0022] Figure 4 Schematic diagram of the structure of the packing ball.

[0023] 1. Reaction shell; 2. Water outlet channel; 3. Mud discharge valve; 4. Mud discharge channel; 5. Filling ball; 6. Filling ball supporting porous plate; 7. Water inlet pipe; 8. Aeration pipe.

[0024] A. Microfiltration membrane jacket; B. Mesh frame; C. Polyurethane filler; D. Activated sludge injection nozzle; D1. Elastic rubber ring head; D2. Duckbill tail. DETAILED DESCRIPTION

[0025] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example 1

[0030] like Figure 1 As shown, the high-concentration activated sludge filler ball and sewage treatment device of the utility model include: a reaction shell 1, which is a cylindrical shell; a water outlet channel 2 for discharging treated water is arranged on the inner side of the upper part of the reaction shell, and a water outlet (not shown in the figure) is arranged on the reaction shell 1 corresponding to the water outlet channel 2; an inlet pipe 7 for sewage is arranged at the bottom of the reaction shell; a porous plate 6 for supporting the filler ball is arranged above the inlet pipe 7, and a filler ball 5 inoculated with activated sludge is arranged on the porous plate; an aeration pipe 8 is arranged in the reaction shell at the lower side of the inlet pipe.

[0031] Example 2

[0032] As a further improvement of the above embodiment, the filler ball is composed of a mesh skeleton, a microfiltration membrane jacket and a polyurethane filler filled inside, and an activated sludge injection nozzle D is provided on the filler ball.

[0033] The mesh skeleton is used as a supporting skeleton of the microfiltration membrane jacket. The microfiltration membrane jacket is made of filter cloth or a material with a microfiltration aperture, and is filled with polyurethane filler inside, with a filling rate of 30%-60%.

[0034] The activated sludge injection nozzle D is composed of an elastic rubber ring head D1 and a duckbill tail D2, and the total length of the injection nozzle does not exceed the radius of the filler ball.

[0035] Example 3

[0036] As a further improvement of the above embodiment, a mud discharge channel 4 for discharging excess sludge is provided at the lower outer portion of the reaction shell, and a mud discharge valve 3 is provided on the reaction shell corresponding to the mud discharge channel.

[0037] Example 4

[0038] As a further improvement of the above embodiment, the water inlet pipe is designed to be wheel-shaped, and holes are evenly opened on the water inlet pipe.

[0039] Example 5

[0040] As a further improvement of the above embodiment, the filler balls in the reaction shell occupy 50%-60% of the total volume, and the pore size of the porous plate supporting the filler balls is smaller than the diameter of the filler balls.

[0041] Example 6

[0042] As a further improvement of the above embodiment, the aeration pipe is a rubber membrane aerator, which is evenly distributed at the bottom of the reaction device.

[0043] Example 7

[0044] As a further improvement of the above embodiment, the activated sludge injected into the filler balls is the residual sludge in the secondary sedimentation tank or the artificially domesticated sludge.

[0045] Example 8

[0046] As a further improvement of the above embodiment, the aeration volume of the aeration pipe should not only meet the oxygen demand of the microorganisms, but also enable the filler balls to be in a fluidized state. The specific air-water ratio should be determined based on experiments, and it is recommended that the air-water ratio be controlled at 10-20.

[0047] The utility model is described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the utility model. Many other changes and modifications that do not depart from the concept and scope of the utility model should be considered as the protection scope of the utility model.

[0048] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0049] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sewage treatment device, characterized in that: include: A reaction shell; a water outlet channel for discharging treated water is arranged on the inner side of the upper part of the reaction shell; a water inlet pipe for taking in sewage is arranged at the bottom of the reaction shell; a porous plate for supporting filler balls is arranged above the water inlet pipe, and filler balls for inoculating activated sludge are arranged on the porous plate; an aeration pipe is arranged in the reaction shell below the water inlet pipe; The filler ball is composed of a mesh frame, a microfiltration membrane outer shell and a polyurethane filler filled inside, and an activated sludge injection nozzle is arranged on the filler ball.

2. The sewage treatment device according to claim 1, characterized in that: The mesh skeleton is used as a supporting skeleton of the microfiltration membrane jacket. The microfiltration membrane jacket is made of filter cloth or a material with a microfiltration aperture, and is filled with polyurethane filler inside, with a filling rate of 30%-60%.

3. The sewage treatment device according to claim 1, characterized in that: The activated sludge injection nozzle is composed of an elastic rubber ring head and a duckbill tail, and the total length of the injection nozzle does not exceed the radius of the filler ball.

4. The sewage treatment device according to claim 1, characterized in that: A mud discharge channel for discharging excess sludge is arranged at the lower part of the outer side of the reaction shell, and a mud discharge valve is arranged on the reaction shell corresponding to the mud discharge channel.

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