Anaerobic tank capable of preventing sludge from settling

Abstract

The utility model discloses an anoxic tank for preventing sludge from settling, which comprises a rectangular tank body, a membrane aeration component for oxygen to pass through and fresh air to be introduced through a fan is placed in the tank body, a plurality of first perforated pipes for discharging waste gas in the membrane aeration component are arranged at the lower end of the membrane aeration component, and a plurality of second perforated pipes for discharging waste gas in the membrane aeration component are arranged at the lower end of the membrane aeration component. Exhaust ports of the first perforated pipes face four corners in the tank body, and first electromagnetic valves are arranged on the first perforated pipes. When the first battery valve is opened, waste gas can be discharged through the first perforated pipe, so that the pressure in the membrane is reduced, fresh air is ensured to enter the membrane, and the exhaust port of the first perforated pipe faces four corners in the tank body, so that the discharged waste gas can stir sludge at the corners in the anoxic tank, and precipitation dead angles in the anoxic tank are prevented; the membrane aeration assembly is arranged, so that the periphery, close to the membrane aeration assembly, of the anoxic tank is an aerobic environment to realize nitrification, and the volume of the aerobic tank is conveniently reduced, so that the aeration rate is reduced, and the aeration energy consumption is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically relating to an anoxic tank for preventing sludge sedimentation. Background Technology

[0002] Currently, rural wastewater treatment mainly uses the AO process, also known as the anaerobic-aerobic process. It is primarily used for nitrogen and phosphorus removal, as well as the removal of organic matter from water. AO treatment applies anaerobic hydrolysis technology to the pretreatment of activated sludge, which can degrade organic pollutants and has a certain nitrogen and phosphorus removal function. Traditional biological denitrification (AO) relies on autotrophic nitrification followed by heterotrophic denitrification. This denitrification process requires a certain carbon source; generally, a COD / TN ratio between 8 and 15 can achieve good denitrification results. In traditional AO treatment processes, the volume ratio of the anoxic tank to the aerobic tank is 3:7. The aerobic tank has a large volume, resulting in high aeration energy consumption. A stirring device is also needed in the anoxic tank to prevent sludge sedimentation, further increasing energy consumption. Utility Model Content

[0003] This invention proposes an anoxic tank to prevent sludge sedimentation, which features high oxygen utilization, low aeration volume, high removal efficiency, and low energy consumption.

[0004] Therefore, the technical solution adopted by this utility model is as follows: an anoxic tank for preventing sludge sedimentation, comprising a rectangular tank body, wherein a membrane aeration component is placed in the tank body to allow oxygen to pass through and fresh air is introduced through a blower, wherein a plurality of first perforated pipes for discharging waste gas from the membrane aeration component are provided at the lower end of the membrane aeration component, wherein the exhaust ports of the first perforated pipes face the four corners of the tank body, and a first solenoid valve is provided on the first perforated pipe.

[0005] As a preferred embodiment of the above scheme, a plurality of second perforated pipes for discharging waste gas from the membrane aeration component are laid below the membrane aeration component, and a second solenoid valve is provided on the second perforated pipe.

[0006] More preferably, the membrane aeration assembly includes a frame and a breathable membrane disposed within the frame. The upper end of the frame is provided with an air inlet buffer chamber communicating with the breathable membrane, and the lower end of the frame is provided with an exhaust buffer chamber communicating with the breathable membrane.

[0007] Preferably, the blower is shared with the blower in the aeration device in the aerobic tank.

[0008] Further preferably, the bottom of the pool is provided with a flow promoter to prevent sludge sedimentation.

[0009] The beneficial effects of this invention are as follows: When the first battery valve is opened, the exhaust gas can be discharged through the first perforated pipe, which reduces the pressure inside the membrane and ensures the entry of fresh air. Furthermore, since the exhaust port of the first perforated pipe faces the four corners of the tank, the discharged exhaust gas can stir the sludge at the corners of the anoxic tank, preventing the formation of sedimentation dead zones in the anoxic tank. A membrane aeration component that can be connected to a blower and supply oxygen is placed in the anoxic tank, so that the area around the membrane aeration component in the anoxic tank becomes an aerobic environment to achieve nitrification. This allows the anoxic tank to also achieve aerobic conditions, making it easier to reduce the volume of the aerobic tank, thereby reducing the aeration volume and aeration energy consumption. Attached Figure Description

[0010] Figure 1 This is the front view of the present invention.

[0011] Figure 2 This is a top view of the present invention.

[0012] Attached reference numerals: Tank body-1, Blower-3, Membrane aeration component-4, First perforated pipe-5, Second perforated pipe-6. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0014] like Figures 1-2 As shown, an anoxic tank for preventing sludge sedimentation has a rectangular tank body 1 as its main body. A membrane aeration component 4 that allows oxygen to pass through is placed in the middle of the tank body 1. The membrane aeration component 4 is connected to a blower 3 through a ventilation duct. When air enters the membrane aeration component 4, the oxygen in the air can pass through the membrane wall of the membrane aeration component 4 and enter the anoxic tank. After entering the anoxic tank, it reacts with the sewage near the membrane aeration component in the anoxic tank to undergo a nitrification reaction. This makes the water near the membrane aeration component 4 an aerobic environment. The oxygen concentration decreases from the inside to the outside, which is an anoxic reaction. This reduces the volume of the aerobic tank and the aeration volume.

[0015] Because oxygen reacts with wastewater after passing through the membrane aeration component, leaving behind mainly nitrogen-based waste gas, multiple perforated pipes 5 are installed at the lower end of the membrane aeration component to discharge this waste gas. The exhaust ports of these perforated pipes 5 face the four corners of the tank. A solenoid valve is installed between the perforated pipes 5 and the permeable membrane. When the solenoid valve is opened, the waste gas is discharged through the perforated pipes, reducing the pressure inside the membrane and ensuring the entry of fresh air. Furthermore, because the exhaust ports of the perforated pipes face the four corners of the tank, the discharged waste gas can agitate the sludge at the corners of the anoxic tank, preventing dead zones.

[0016] Several second perforated pipes 6 are laid below the membrane aeration assembly to discharge waste gas from the assembly, and a second solenoid valve is installed on each of the second perforated pipes 6. Preferably, the exhaust port of the second perforated pipe 6 faces upwards and is aligned with the permeable membrane, allowing it to directly clean the membrane. When the exhaust port is not facing the permeable membrane, the membrane aeration assembly is shaken by force and reaction force, achieving cleaning. A nozzle can also be installed on the exhaust port of the second perforated pipe. When the second solenoid valve is opened, waste gas can be discharged through the second perforated pipe, cleaning the membrane aeration assembly and preventing sludge from adhering to it.

[0017] Preferably, the membrane aeration assembly 5 includes a frame and several breathable membranes disposed within the frame, allowing oxygen to pass through. Specifically, the breathable membranes are shaped like membrane tubes and distributed within the frame. An air-permeable buffer chamber is provided at the upper end of the frame, communicating with the upper ends of all the breathable membranes, and an exhaust buffer chamber is provided at the lower end of the frame, communicating with the lower ends of all the breathable membranes. Correspondingly, the first perforated pipe and the second perforated pipe are both connected to the exhaust buffer chamber via connecting pipes.

[0018] To further prevent sedimentation in the anoxic tank, a stirring device is installed inside the tank; preferably, the stirring device is a flow promoter.

Claims

1. An anoxic tank for preventing sludge sedimentation, characterized in that: The system includes a rectangular pool (1) containing a membrane aeration assembly (4) that allows oxygen to pass through and fresh air to be introduced by a blower (3). The lower end of the membrane aeration assembly (4) is provided with a plurality of first perforated pipes (5) for discharging waste gas from the membrane aeration assembly. The exhaust ports of the first perforated pipes (4) face the four corners of the pool (1), and a first solenoid valve is provided on the first perforated pipes (5).

2. The anoxic tank for preventing sludge sedimentation according to claim 1, characterized in that: Several second perforated pipes (6) for discharging waste gas from the membrane aeration component (4) are laid below the membrane aeration component (4), and a second solenoid valve is provided on the second perforated pipes (6).

3. The anoxic tank for preventing sludge sedimentation according to claim 1, characterized in that: The membrane aeration assembly (5) includes a frame and a breathable membrane disposed within the frame. An air inlet buffer chamber communicating with the breathable membrane is provided at the upper end of the frame, and an exhaust buffer chamber communicating with the breathable membrane is provided at the lower end of the frame.

4. An anoxic tank for preventing sludge sedimentation as described in claim 1, characterized in that: The blower (3) is shared with the blower in the aeration device in the aerobic tank.

5. An anoxic tank for preventing sludge sedimentation as described in claim 1, characterized in that: The bottom of the pool (1) is equipped with a flow promoter to prevent sludge from settling.

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