High-concentration activated sludge filler ball and sewage treatment device

Abstract

The application discloses a high-concentration activated sludge filler ball and sewage treatment equipment. The equipment comprises a reaction shell, a water outlet channel for discharging treated water arranged on the upper inner side of the reaction shell, a water inlet pipe for feeding sewage arranged on the bottom of the reaction shell, a porous plate for supporting the filler ball arranged above the water inlet pipe, filler balls inoculated with activated sludge arranged on the porous plate, and an aeration pipe arranged in the reaction shell on the lower side of the water inlet pipe. The application solves the problem of maintaining high-concentration sludge, effectively improves the sludge concentration in the aeration tank, makes the activated sludge concentration in the aeration tank not limited by the hydraulic retention time and the sludge discharge period, and simultaneously, since the sludge in the sludge maintaining device is short of oxygen and anaerobic, the denitrification reaction is more favorable to occur, and therefore, the total nitrogen removal effect is better.

Description

Technical Field

[0001] The present invention relates to a filler ball 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 activated sludge age. 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 makes the activated sludge easy to lose. It is difficult to maintain the sludge concentration and volume load at a high level, which restricts the improvement of sewage treatment efficiency.

[0003] To address the problem of difficulty in maintaining high sludge concentration and volumetric load in sewage treatment aeration tanks, biofilm processes or immobilized microorganism technologies are often used in the prior art to increase the activated sludge concentration in the aeration tank. However, due to the combined effects of hydraulic shear force and interaction between microorganisms and fillers in the aeration tank, it is difficult for the biofilm method to form a very thick biofilm, thereby limiting the increase in sludge concentration in the aeration tank. Existing immobilization technology has harsh reaction conditions and a long sludge startup time, which makes it difficult to apply in practice. To address the above problems, the present invention provides high-concentration activated sludge filler balls and a sewage treatment device. High-concentration activated sludge is inoculated into the filler balls, achieving sludge immobilization, saving a sludge return system, avoiding sludge loss, and effectively increasing the sludge concentration and volumetric load in the aeration tank. At the same time, since the sludge in the device is immobilized in the filler balls, an anoxic zone can be formed inside, providing an anoxic environment for denitrification. The coupling of the external aerobic zone and the internal anoxic zone can achieve simultaneous nitrification and denitrification, thereby effectively improving the removal efficiency of total nitrogen. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the object of the present invention is to provide a high-concentration activated sludge filler ball and sewage treatment equipment.

[0005] To achieve the above-mentioned objectives, the high-concentration activated sludge filler balls and sewage treatment equipment of the present invention include: a reaction shell; a water outlet channel for discharging treated water is provided on the inner side of the upper portion of the reaction shell; an inlet pipe for taking in sewage is provided at the bottom of the reaction shell; a porous plate for supporting the filler balls is provided above the inlet pipe, and filler balls inoculated with activated sludge are provided on the porous plate; and an aeration pipe is provided in the reaction shell below the inlet pipe.

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

[0007] Furthermore, the mesh skeleton serves as a supporting skeleton for the microfiltration membrane jacket, which is made of filter cloth or a material with a microfiltration aperture, and is filled with polyurethane filler 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 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.

[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 excess sludge in the secondary sedimentation tank or artificially domesticated sludge.

[0014] The present invention has the following beneficial effects:

[0015] (1) The present invention solves the problem of maintaining high-concentration sludge, can effectively increase the sludge concentration in the aeration tank, and makes the activated sludge concentration in the aeration tank 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 present invention can maintain the sludge concentration at more than 10000 mg / L. At the same time, since there are more anoxic and anaerobic zones in the sludge installed 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 balls are made of a mesh skeleton, a microfiltration membrane jacket and a polyurethane filler filled inside, which can ensure that sewage and air can enter the packing balls smoothly. The air entering the packing is broken into tiny bubbles under the action of the mesh, thereby fully contacting the sludge and sewage, ensuring the mass transfer efficiency. Sludge is difficult 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 removed, the sludge outlet is opened from the lower part of the reaction device, and the density is increased. The large filler balls are discharged from the lower sludge discharge port into the sludge discharge channel. After the muddy sludge in the high-density filler is extracted, the density of the filler balls becomes smaller and they are re-added into the reaction device. Under the action of hydraulic classification, they are transferred to the upper part of the reaction device. As the reaction device continues to operate, the membrane sludge continues to thicken, and the force acting on the biofilm body continues to decrease. The membrane sludge separates from the biofilm and is converted into muddy sludge again. This cycle can ensure that the sludge in the filler balls is constantly updated, enhance the biological activity of the activated sludge, and improve the sewage purification efficiency.

[0018] (4) The sludge in this 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 is a cross-sectional view of an embodiment of the present invention;

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

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

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

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

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

[0025] The embodiments of the present invention 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 the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] Example 1

[0030] like Figure 1 As shown, the high-concentration activated sludge filler balls and sewage treatment equipment of the present invention include: a reaction shell 1, which is a cylindrical shell; a water outlet channel 2 for discharging treated water is provided on the inner side of the upper portion of the reaction shell, and a water outlet (not shown in the figure) is provided on the side wall of the reaction shell 1 corresponding to the water outlet channel 2; an inlet pipe 7 for taking in sewage is provided at the bottom of the reaction shell; a porous plate 6 for supporting the filler balls is provided above the inlet pipe 7, and filler balls 5 inoculated with activated sludge are provided on the porous plate; an aeration pipe 8 is provided in the reaction shell below 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 serves as a supporting skeleton for 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 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 portion of the outer side 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 artificially domesticated sludge.

[0045] Example 8

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

[0047] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments. Various modifications may be made within the scope of knowledge of those skilled in the art without departing from the spirit of the present invention. Many other changes and modifications that do not depart from the spirit and scope of the present invention should be considered within the scope of protection of the present invention.

[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 description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A sewage treatment equipment, characterized in that: include: A reaction shell; a water outlet channel for discharging treated water is provided on the inner side of the upper portion of the reaction shell; an inlet pipe for sewage is provided at the bottom of the reaction shell; a porous plate for supporting filler balls is provided above the inlet pipe, and filler balls for inoculating activated sludge are provided on the porous plate; an aeration pipe is provided in the reaction shell below the inlet pipe; The filler ball is composed of a mesh frame, a microfiltration membrane jacket and a polyurethane filler filled inside, and an activated sludge injection nozzle is provided on the filler ball; 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; The mesh skeleton serves as a supporting skeleton for the microfiltration membrane jacket. The microfiltration membrane jacket is made of a material with a microfiltration pore size and is filled with polyurethane filler with a filling rate of 30%-60%.

2. The sewage treatment equipment 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.

3. The sewage treatment equipment according to claim 1, characterized in that: The water inlet pipe is designed to be wheel-shaped, and holes are evenly opened on the water inlet pipe.

4. The sewage treatment equipment according to claim 1, characterized in that: The filler balls in the reaction shell account for 50%-60% of the total volume, and the aperture of the porous plate supporting the filler balls is smaller than the diameter of the filler balls.

5. The sewage treatment equipment according to claim 1, characterized in that: The aeration pipe is a rubber membrane aerator, which is evenly distributed at the bottom of the reaction device.

6. The sewage treatment equipment according to claim 1, characterized in that: The activated sludge injected into the filler balls is the residual sludge in the secondary sedimentation tank or artificially domesticated sludge.

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