Acid pickling structure of ABR (anaerobic baffled reactor) reaction tank

Abstract

The utility model discloses a pickling structure of an ABR (anaerobic baffled reactor) reaction tank. An acid liquor control valve is arranged at the end, extending out of the reaction tank, of each acid liquor conveying pipe. During use, sewage in the reaction tank is completely emptied, and the acid liquor conveying pipe conveys acid liquor into the reaction tank until the liquid level of the acid liquor is slightly below the uppermost end of the small gravel layer, so that the acid liquor sufficiently reacts with hardening and blockage of impurities, falls off from the surfaces of the gravels and returns to the bottom of the reaction tank during back flushing, and the acid liquor is recycled. And then the sewage is discharged from the drain outlet. In the acid pickling process, the acid liquor conveying pipe in the gravel layer sprays acid liquor into the gravel layer, the acid liquor conveying pipe at the pool bottom conveys the acid liquor to the bottom in the reaction pool, and the liquid level of the acid liquor continuously rises through continuous conveying till the liquid level of the acid liquor makes contact with the bottom face of the large gravel layer. After pickling for several times, the reaction tank is cleaned by backwashing water, so that hardening and blockage are eliminated, and the normal use of the reaction tank is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial wastewater treatment and relates to the improvement of an ABR structure, in particular to an ABR reaction tank acid washing structure. Background Art

[0002] The general structure of the ABR (Advanced Biological Reactor) reaction tank is shown in Figure 1, including a tank body 1, a carrier filter layer 2 and a support layer 5. A plurality of filter plates 11 arranged in a matrix are arranged between the support layer and a plurality of spaced filter beams 10, and a plurality of filter heads 9 are installed on each filter plate. The filter head is used to connect the bottom and the top of the filter plate. When in use, the sewage valve 14 is opened, and the sewage enters the bottom of the reaction tank from the water inlet pipe 13, and then enters the support layer and the carrier filter layer from the filter head. The treated water is filtered through the filter grid at the outlet of the reaction tank and enters the drainage tank. In actual use, it is found that since the support layer is composed of multiple layers of gravel with different particle sizes, when the sewage passes through, some impurities in it will stick to the irregular surface of the gravel. Although the reaction tank is provided with a backwashing structure and backwashing is performed regularly, some impurities will still remain until the impurities are compacted and blocked at each layer of gravel, which not only reduces the flow of sewage, but also blocks the entire support layer in severe cases, so that the sewage at the bottom of the reaction tank cannot rise to the carrier filter layer. Once partial or complete blockage occurs, operators are required to clear the blockage. First, the sewage must be discharged, then the carrier filter layer must be salvaged, and then the gravel blockage in the supporting layer must be cleared by manpower. This treatment method is not only inefficient, but also causes heavy work for the operators. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide an ABR reaction tank acid washing structure.

[0004] The technical solution adopted by the utility model to solve the technical problem is:

[0005] An ABR reaction tank pickling structure comprises a reaction tank, a carrier filter layer and a supporting layer, characterized in that: a plurality of acid delivery pipes are arranged in the supporting layer, a plurality of openings are arranged on the outer surface of the portion of each acid delivery pipe located in the reaction tank, and one end of each acid delivery pipe extends out of the reaction tank.

[0006] Further: the supporting layer includes a large gravel layer, a medium-large gravel layer, a medium-small gravel layer and a small gravel layer;

[0007] Any one, any two, any three or all four of the large gravel layer, the medium-large gravel layer, the medium-small gravel layer or the small gravel layer are provided with a plurality of acid delivery pipes.

[0008] Furthermore: a plurality of acid delivery pipes are respectively arranged in the large gravel layer, the medium-large gravel layer, the medium-small gravel layer and the small gravel layer; the acid delivery pipes in adjacent gravel layers are staggered with each other; and an acid control valve is arranged on each acid delivery pipe extending out of the reaction tank.

[0009] Further: any one, any two, any three or all of the large gravel layer, the medium-large gravel layer, the medium-small gravel layer and the small gravel layer are provided with a plurality of aeration pipes.

[0010] Furthermore: a plurality of acid delivery pipes are arranged at the bottom of the reaction tank.

[0011] Furthermore: a liquid level meter for detecting the height of the acid liquid injected into the reaction tank is arranged on the outer surface of the reaction tank.

[0012] The technical effects achieved by the utility model are:

[0013] In the utility model, a plurality of acid delivery pipes spaced apart from each other are arranged in each of the large gravel layer, the medium-large gravel layer, the medium-small gravel layer and the small gravel layer, and a plurality of acid delivery pipes spaced apart from each other are installed in the filter beam at the bottom of the reaction tank, and an acid control valve is arranged at the end of each acid delivery pipe extending out of the reaction tank. When in use, the sewage in the reaction tank is completely emptied, and the acid delivery pipe delivers the acid into the reaction tank until the liquid level of the acid is slightly below the uppermost end of the small gravel layer, so that the acid fully reacts with the compaction and blockage of the impurities, so that the impurities fall off from the gravel surface, and return to the bottom of the reaction tank during backwashing, and then are discharged from the sewage outlet. In the above-mentioned pickling process, the acid delivery pipe in the gravel layer sprays the acid into the gravel layer, and the acid delivery pipe at the bottom of the tank delivers the acid to the bottom of the reaction tank and continuously delivers the acid so that the liquid level of the acid continues to rise until the acid level contacts the bottom of the large gravel layer. After pickling several times, it is cleaned with backwash water to eliminate compaction and blockage to ensure the normal use of the reaction tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 yes Figure 1 Enlarged left view of the support layer. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them.

[0017] An ABR reaction tank pickling structure, as shown in the figure, includes a reaction tank, a carrier filter layer 2 and a supporting layer 5, a plurality of acid delivery pipes 6 are arranged in the supporting layer, a plurality of openings are arranged on the outer surface of the portion of each acid delivery pipe located in the reaction tank, and one end of each acid delivery pipe extends out of the outside of the reaction tank.

[0018] The supporting layer includes a large gravel layer 21, a medium-large gravel layer 20, a medium-small gravel layer 19 and a small gravel layer 18; any one, any two, any three or all four of the large gravel layer, the medium-large gravel layer, the medium-small gravel layer or the small gravel layer are provided with a plurality of acid delivery pipes. The preferred solution is that: the large gravel layer, the medium-large gravel layer, the medium-small gravel layer and the small gravel layer are respectively provided with a plurality of acid delivery pipes; the acid delivery pipes in adjacent gravel layers are as follows: Figure 2 Each acid delivery pipe extending out of the reaction tank is provided with an acid control valve 15. The pipe body of the acid delivery pipe in the gravel layer is provided with openings on both sides of the radial direction, and the aperture of the opening is small, so that the flow rate of the acid output is as small as possible.

[0019] The above mutual misalignment is as follows Figure 2 As shown, the acid delivery pipes in the small gravel layer are arranged at intervals in the horizontal direction, and each acid delivery pipe in the small and medium gravel layer below it is located exactly between two adjacent acid delivery pipes in the small gravel layer. Similarly, the acid delivery pipe in the medium and large gravel layer is also located between two adjacent acid delivery pipes in the small and medium gravel layers.

[0020] Any one, any two, any three or all of the large gravel layer, medium-large gravel layer, medium-small gravel layer and small gravel layer are provided with a plurality of aeration pipes 7, one end of the aeration pipe extends out of the reaction tank and the pipe is installed with an aeration control valve 16. The aeration pipe structure in the figure is only for illustration, and the specific structure must meet the requirements of the reaction tank.

[0021] A plurality of acid delivery pipes are arranged at the bottom of the reaction tank, and the acid delivery pipes at this location also have openings at both sides of the radial direction of the pipe body, and the aperture of the openings at this location is appropriately increased to increase the flow rate of the acid. A liquid level gauge 17 for detecting the height of the acid injected into the reaction tank is arranged on the outer surface of the reaction tank.

[0022] A filter screen 3 is installed at the outlet of the reaction tank, and a backwash nozzle 4 is arranged beside the filter screen. A plurality of filter beams 10 are arranged at the bottom of the reaction tank, and a plurality of filter plates 11 are fixed to two adjacent filter beams one by one. The two ends of the filter plates are pressed on the surface of the filter beams on the same side. When all the filter plates are placed, cement is poured to form a fixed layer 8. The fixed layer seals all the filter plates. The upper end of the filter head on each filter plate is located above the fixed layer, and the lower end of each filter head is located in the gap between the filter beams at the bottom of the reaction tank.

[0023] A sewage inlet pipe 13 is arranged on one side of the bottom of the reaction tank, and a sewage valve 14 is arranged on the pipe. A sampling pipe 12 is arranged on the bottom of the reaction tank, and a control valve is installed on the sampling pipe. A plate-type liquid level gauge 17 using the connecting pipe principle is installed on the outer wall of the lower end of the reaction tank. The upper and lower ends of the plate-type liquid level gauge are respectively connected to the inside of the reaction tank, and the connecting pipes are both installed with switch valves.

[0024] Acid cleaning can be done in the following ways:

[0025] The acid liquid can use citric acid, and the acid liquid can be prepared on site, or the acid liquid stored in the storage tank can be used. The acidity of citric acid is weak, but when it is transported to the tank body through each acid delivery pipe, the liquid level of the acid liquid should be lower than the upper end surface of the uppermost small gravel layer. The specific height of the acid liquid level can be observed through the above-mentioned plate level gauge located outside the tank body.

[0026] When the acid is transported, it is initially transported by the multiple acid delivery pipes located at the bottom of the filter beam. At this time, the flow rate can be increased to increase the speed of acid delivery. When the plate level gauge shows that the acid is close to the bottom large gravel layer, the acid delivery speed is reduced to allow the acid level to slowly rise. When it finally approaches the upper end surface of the top small gravel layer, the acid control valve 15 located outside the tank body of the acid delivery pipe at the filter beam is closed. After the acid has been soaked for a period of time, the drain outlet at the bottom of the tank is opened to discharge the acid.

[0027] In addition to the above operation methods, when the acid delivery pipe at the filter beam starts to deliver acid, the acid delivery pipes in each gravel layer can also be used to deliver acid synchronously, but the acid delivery speed here should be slow to avoid the acid rising too fast to the carrier layer due to the compaction and blockage of the gravel layer. When the acid level is close to the upper end of the small gravel layer, stop the acid delivery, and after soaking for a period of time, open the sewage outlet at the bottom of the pool to discharge the acid.

[0028] The acid delivery pipe located in the gravel layer can also be used alone, for example: the acid delivery pipe of the large gravel layer sprays acid for cleaning first, and then after a period of time, the acid delivery pipe of the medium and large gravel layer is opened, and the acid delivery pipes of the medium and small gravel layers and the small gravel layer are gradually opened. The acid delivery pipe of the gravel layer delivers acid at a slower speed, and the gravel layer below is cleaned first to facilitate the impurities eluted by the acid in the upper layer to flow to the bottom of the pool below. Similarly, after cleaning for a period of time, the acid delivery pipe is closed.

[0029] Regardless of which of the above acid cleaning methods is used, clean water should be backwashed after cleaning is completed to discharge the acid out of the pool body. After flushing several times, water should be taken from the sampling tube at the bottom of the pool to measure the pH value. If it meets the process requirements, the next batch of sewage can be treated.

[0030] When the utility model is used, the sewage in the reaction tank is completely emptied, and the acid delivery pipe delivers the acid into the reaction tank until the liquid level of the acid is slightly below the upper end surface of the uppermost end of the small gravel layer, so that the acid fully reacts with the compaction and blockage of the impurities, causing them to fall off the gravel surface, and return to the bottom of the reaction tank during backwashing, and then be discharged from the sewage outlet. During the above-mentioned pickling process, the acid delivery pipe in the gravel layer sprays the acid into the gravel layer, and the acid delivery pipe at the bottom of the tank delivers the acid to the bottom of the reaction tank and continuously delivers the acid to continuously increase the liquid level until the acid level contacts the bottom surface of the large gravel layer. After pickling several times, it is cleaned by backwashing water to eliminate compaction and blockage, thereby ensuring the normal use of the reaction tank.

Claims

1. An ABR reaction tank pickling structure, comprising a reaction tank, a carrier filter layer and a supporting layer, characterized in that: A plurality of acid delivery pipes are arranged in the supporting layer, and a plurality of openings are arranged on the outer surface of the portion of each acid delivery pipe located in the reaction tank, and one end of each acid delivery pipe extends out of the reaction tank; The supporting layer includes a large gravel layer, a medium-large gravel layer, a medium-small gravel layer and a small gravel layer; Any one, any two, any three or all four of the large gravel layer, the medium-large gravel layer, the medium-small gravel layer or the small gravel layer are provided with a plurality of acid delivery pipes; A plurality of acid delivery pipes are respectively arranged in the large gravel layer, the medium-large gravel layer, the medium-small gravel layer and the small gravel layer; the acid delivery pipes in adjacent gravel layers are mutually staggered; and an acid control valve is arranged on each acid delivery pipe extending out of the reaction tank; A plurality of acid delivery pipes are arranged at the bottom of the reaction tank; A liquid level meter for detecting the height of the acid solution injected into the reaction tank is arranged on the outer surface of the reaction tank.

2. The ABR reaction tank pickling structure according to claim 1, characterized in that: Any one, any two, any three or all of the large gravel layer, the medium-large gravel layer, the medium-small gravel layer and the small gravel layer are provided with a plurality of aeration pipes.

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