PAC adding device for sludge conditioning

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a PAC adding device for sludge conditioning, which comprises a PAC storage tank and a PAC adding tank. The PAC storage tank is connected with a PAC adding tank, a second conveying pipe is arranged at the bottom of the PAC adding tank and extends to the sludge conditioning pool, a second conveying pump is arranged on the second conveying pipe, and the second conveying pipe is connected with a third conveying pipe at the rear end of the second conveying pump; water in the sludge conditioning tank is extracted by the third conveying pipe and is premixed with PAC in the second conveying pipe; a medicine adding pipe is arranged at the tail end of the second conveying pipe, and a horizontal arc-shaped bent pipe section is arranged at the tail end of the medicine adding pipe. According to the utility model, on one hand, the premixing of PAC can be realized, and on the other hand, the added PAC can be quickly dispersed in water, so that the PAC can quickly and efficiently play a role.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a PAC dosing device for sludge conditioning. Background Technology

[0002] During the biological treatment of wastewater, a large amount of residual sludge is generated. The water content of the residual sludge can reach over 99%, which will cause environmental harm if not treated. However, the residual sludge also contains a large amount of organic matter, which is a reusable resource. However, due to the high water content of the residual sludge, it needs to be dewatered during the treatment process. But due to the characteristics of the residual sludge, dewatering is difficult during the treatment process. The current conventional method is to condition the residual sludge before dewatering to improve its settling and dewatering performance.

[0003] PAC (polyaluminum chloride) is commonly used in sludge conditioning. During the addition of PAC, stirring is used to ensure that PAC is evenly dispersed in the sludge conditioning tank, thereby conditioning the sludge. Generally speaking, the dispersion effect of PAC in the sludge conditioning tank directly affects the conditioning effect and efficiency of the sludge. Existing PAC is generally added directly, followed by stirring to ensure that PAC is evenly dispersed. However, even dispersion takes a long time, which can lead to a decrease in conditioning efficiency and an increase in reagent consumption.

[0004] Therefore, this utility model proposes a PAC dosing device for sludge conditioning. By pre-mixing and increasing the water volume before spraying, PAC can be dispersed more quickly in the sludge conditioning tank, thus facilitating the rapid and efficient function of PAC and playing a positive role in improving treatment efficiency. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a PAC dosing device for sludge conditioning, so as to enable PAC to be rapidly dispersed in the sludge conditioning tank.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a PAC dosing device for sludge conditioning, comprising a PAC storage tank and a PAC addition tank connected together, wherein a second conveying pipe is provided at the bottom of the PAC addition tank, the second conveying pipe extends to the sludge conditioning tank, a second conveying pump is provided on the second conveying pipe, a third conveying pipe is connected to the second conveying pipe at the rear end of the second conveying pump, a third conveying pump is provided on the third conveying pipe, and the third conveying pipe conveys water from the sludge conditioning tank to the second conveying pipe.

[0007] Furthermore, a first delivery pipe is provided between the PAC storage tank and the PAC addition tank, a first delivery pump is provided on the first delivery pipe, and a first control valve is provided at the front end of the first delivery pump. The first control valve and the first delivery pump are used interchangeably.

[0008] Furthermore, a second delivery pump is installed on the second delivery pipe, and a second control valve is installed at the front end of the second delivery pump. The second control valve and the second delivery pump are used interchangeably.

[0009] Furthermore, a third control valve is provided at the front end of the third delivery pump and a check valve is provided at the rear end of the third delivery pump on the third delivery pipe.

[0010] Furthermore, a dosing pipe is provided at the end of the second conveying pipe, and the outlet of the dosing pipe is partially or entirely located below the liquid surface of the sludge conditioning tank.

[0011] Furthermore, the dosing pipe includes a straight pipe section connected to the second delivery pipe, and a horizontal arc-shaped bend is provided below the straight pipe section. The outlet is located behind the arc-shaped bend and is funnel-shaped.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model achieves premixing of PAC by adding water from the sludge conditioning tank through the PAC addition pipe, which is beneficial for the rapid dispersion of PAC in the sludge conditioning tank.

[0014] 2. This utility model uses a dosing pipe to add PAC to the effluent after mixing in the sludge conditioning tank by spraying it out at the liquid surface, which further accelerates the dispersion of PAC in the sludge conditioning tank and helps PAC to play its role quickly and efficiently. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the dosing tube structure of this utility model.

[0017] The names corresponding to each mark in the diagram:

[0018] 1. PAC storage tank; 11. First inlet; 12. First outlet; 2. First delivery pipe; 21. First control valve; 22. First delivery pump; 3. PAC addition tank; 31. Second inlet; 32. Water inlet; 33. Second outlet; 4. Water inlet pipe; 5. Second delivery pipe; 51. Second delivery pump; 52. Second control valve; 6. Third delivery pipe; 61. Third delivery pump; 62. Third control valve; 63. Check valve; 7. Dosing pipe; 71. Straight pipe section; 72. Connecting flange; 73. Arc-shaped bend section; 74. Bell mouth. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0020] Embodiments of this utility model:

[0021] like Figure 1-2 As shown, in this embodiment, a PAC storage tank 1 is provided, and a first liquid inlet 11 and a first liquid outlet 12 are provided on the PAC storage tank 1. The first liquid outlet 12 is connected to a first conveying pipe 2, which extends to the bottom of the interior of the PAC storage tank 1. In this embodiment, the PAC storage tank 1 is a horizontal storage tank, which may be buried underground, etc.

[0022] A first delivery pump 22 is installed on the first delivery pipe 2, and a first control valve 21 is installed at the front end of the first delivery pump 22. The first delivery pump 22 and the first control valve 21 are used interchangeably. The first delivery pipe 2 is connected to the PAC addition tank 3.

[0023] A second liquid inlet 31 and a water inlet 32 ​​are provided above the PAC addition tank 3, and a second liquid outlet 33 is provided below the PAC addition tank 3. The second liquid inlet 31 is connected to the first conveying pipe 2, the water inlet 32 ​​is connected to the water inlet pipe 4, and the second liquid outlet 33 is connected to the second conveying pipe 5. In this embodiment, the PAC addition tank 3 is a vertical storage tank with a stirrer provided above it. Commercially available PAC can be diluted to a certain extent in the PAC addition tank 3 according to the production process, and then discharged through the second conveying pipe 5.

[0024] A second delivery pump 51 is provided on the second delivery pipe 5, and a second control valve 52 is provided at the front end of the second delivery pump 51. The second control valve 52 and the second delivery pump 51 are used interchangeably. In this embodiment, the second delivery pump 51 can be a peristaltic pump.

[0025] The second conveying pipe 5 extends to the sludge conditioning tank and is connected to the third conveying pipe 6 via a tee. A third conveying pump 61 is installed on the third conveying pipe 6, a third control valve 62 is installed at the front end of the third conveying pipe 6, and a check valve 63 is installed at the rear end of the third conveying pipe 6. In this embodiment, the third conveying pump 61 pumps the sewage in the sludge conditioning tank into the second conveying pipe 5 and premixes it with the PAC in the second conveying pipe 5.

[0026] At the end of the second delivery pipe 5, it is connected to the dosing pipe 7 via a flange. The outlet of the dosing pipe 7 extends to below the liquid surface of the sludge conditioning tank. The dosing pipe 7 includes a straight pipe section 71. A connecting flange 72 is provided above the straight pipe section 71, and it is connected to the second delivery pipe 5 via the connecting flange 72. A horizontal arc-shaped bend section 73 is provided below the straight pipe section 71. A bell mouth 74 is provided behind the arc-shaped bend section 73. The effluent after mixing PAC flows out tangentially from the outlet of the arc-shaped bend section 73.

[0027] The principle of this utility model is as follows:

[0028] In use, the commercially available PAC in the PAC storage tank 1 is pumped into the PAC addition tank 3. In actual production, multiple PAC addition tanks 3 can be arranged in parallel (each is independently controlled by a valve). On the one hand, if there are multiple sludge conditioning tanks, different tanks can be adapted; on the other hand, when the PAC in one PAC addition tank 3 is finished, it can be switched to another PAC addition tank 3.

[0029] According to actual production needs, PAC is diluted to a suitable concentration by adding a certain amount of water to PAC addition tank 3. For example, if 10% liquid PAC is purchased from the market, and a concentration of about 5% is required in production, it can be diluted to a certain extent. During the process, a certain amount of water can be metered and added. The addition of water can be done by metering pump or flow meter, etc., which will not be elaborated further. The stirrer can make PAC and water mix evenly.

[0030] The PAC in the PAC addition tank 3 is metered and transported to the sludge conditioning tank by a peristaltic pump. During the transportation process, water from the tank is added to the transportation pipeline, which not only premixes the PAC but also increases the total water volume (the amount of PAC added is generally small), so that the water after mixing the PAC can be sprayed out from the end of the dosing pipe 7.

[0031] In actual production, the funnel 74 at the end of the dosing pipe is partially or completely below the liquid surface of the sludge sedimentation tank (if it is completely below the liquid surface, it is 0-5cm below the liquid surface). This allows the PAC in the effluent from the dosing pipe 7 to disperse quickly in the water, which helps the PAC to work quickly and efficiently.

Claims

1. A PAC dosing device for sludge conditioning, comprising a PAC storage tank (1) and a PAC addition tank (3), wherein the PAC storage tank (1) and the PAC addition tank (3) are connected, characterized in that: The bottom of the PAC addition tank (3) is provided with a second conveying pipe (5), which extends to the sludge conditioning tank. A second conveying pump (51) is provided on the second conveying pipe (5). The second conveying pipe (5) at the rear end of the second conveying pump (51) is connected to a third conveying pipe (6). A third conveying pump (61) is provided on the third conveying pipe (6). The third conveying pipe (6) conveys water from the sludge conditioning tank to the second conveying pipe (5).

2. The PAC dosing device for sludge conditioning according to claim 1, characterized in that: A first delivery pipe (2) is provided between the PAC storage tank (1) and the PAC addition tank (3). A first delivery pump (22) is provided on the first delivery pipe (2). A first control valve (21) is provided at the front end of the first delivery pump (22). The first control valve (21) and the first delivery pump (22) are used interchangeably.

3. The PAC dosing device for sludge conditioning according to claim 1, characterized in that: A second delivery pump (51) is provided on the second delivery pipe (5), and a second control valve (52) is provided at the front end of the second delivery pump (51). The second control valve (52) and the second delivery pump (51) are used interchangeably.

4. The PAC dosing device for sludge conditioning according to claim 1, characterized in that: On the third delivery pipe (6), a third control valve (62) is provided at the front end of the third delivery pump (61), and a check valve (63) is provided at the rear end of the third delivery pump (61).

5. The PAC dosing device for sludge conditioning according to claim 1, characterized in that: The second conveying pipe (5) is provided with a dosing pipe (7) at its end, and the outlet of the dosing pipe (7) is located partially or entirely below the liquid surface of the sludge conditioning tank.

6. The PAC dosing device for sludge conditioning according to claim 5, characterized in that: The dosing pipe (7) includes a straight pipe section (71) connected to the second delivery pipe (5). A horizontal arc-shaped bend pipe section (73) is provided below the straight pipe section (71), and the outlet is located behind the arc-shaped bend pipe section (73) and the outlet is in the shape of a trumpet (74).

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