CN106430557B - A device for preventing the MBBR feed from clogging the water outlet of the biochemical pool - Google Patents

Abstract

A device for preventing the water outlet of a biochemical pool from being blocked by MBBR materials, comprising a U-shaped water outlet screen placed in front of the water outlet. The mesh holes of the water outlet screen are rhombuses with internal angles of 120° and 60° respectively, and the side lengths of the rhombus are according to The size of the MBBR material is obtained by calculation. The back of the screen is close to the inside of the biochemical tank wall where the water outlet is located, and covers the water outlet. The aeration pipe of the water outlet connected to the air source; on the wall of the biochemical pool above the water outlet, there is a baffle plate that bends inwards and the upper edge is higher than the front edge of the screen; on the bottom of the biochemical pool near the water outlet There are auxiliary aeration pipes corresponding to the outlet screen at the end of the biochemical pool wall. The device can effectively prevent the MBBR feed from blocking the water outlet of the biochemical pool, and avoid the phenomenon of sewage overflow affecting equipment operation and loss of MBBR feed caused by the blockage of the water outlet by MBBR feed.

Description

A device for preventing the MBBR feed from clogging the water outlet of the biochemical pool

technical field

The invention relates to a sewage treatment device, in particular to a device used for biochemical treatment of sewage pools to prevent MBBR from adding materials to block the water outlet.

Background technique

The MBBR (Moving Bed Biofilm Reactor) process is called the moving bed biofilm reactor process. This process adds a certain amount of suspension carrier to the reactor, that is, the MBBR feed. Since the feed density is close to water, the aeration When it is in a state of complete mixing with water, the environment for the growth of microorganisms is gas, liquid and solid. Through the collision and shearing of the carrier in the water, the air bubbles are made smaller and the utilization rate of oxygen is improved; at the same time, a single carrier (generally a hollow cylinder) has different biological species inside and outside, and some anaerobic bacteria or bacteria grow in the inner hole. Facultative bacteria, external bacteria are good bacteria, a single carrier is a micro-reactor, and nitrification and denitrification reactions exist at the same time, so that the sewage treatment effect is improved.

The MBBR process combines the advantages of both the traditional fluidized bed and the biological contact oxidation method. It is a new and efficient sewage treatment method. Form suspended activated sludge and adhered biofilm, so that the moving bed biofilm fills the entire reactor space, give full play to the advantages of both attached phase and suspended phase organisms, make them complement each other, and improve the efficiency of sewage treatment improve.

Although the MBBR process can effectively improve the sewage treatment effect, there is a common technical problem affecting the operation of the process in the existing sewage treatment plants using this process. It is very easy to gather to the water outlet, block the water outlet, cause the water level of the biochemical pool to rise, and make the sewage overflow from the upper part of the biochemical pool. Not only seriously affect the normal operation of the sewage treatment system, but also part of the additives will be lost together with the overflowing sewage. This is an important factor affecting the popularization and application of MBBR technology.

Contents of the invention

The purpose of the present invention is to provide a kind of device that prevents MBBR feeding from blocking the water outlet of biochemical pool, to solve the technical problem that MBBR feeding blocks the water outlet of biochemical pool existing in existing sewage treatment plants.

The device provided by the present invention to prevent the MBBR from adding materials to block the water outlet of the biochemical pool includes a water outlet screen placed at the front of the water outlet and having a U-shaped longitudinal section, and the back of the water outlet screen is attached to the biochemical pool where the water outlet is located The inner side of the wall and cover the water outlet, the upper edge of the front edge of the water outlet screen is 300-400mm higher than the water level of the biochemical pool (design water level); there is a water outlet connected to the gas source through the air pipe and valve on the bottom of the water outlet screen Aeration pipe; on the inner wall of the biochemical pool above the water outlet hole, there is a baffle plate that bends toward the pool and its upper edge is higher than the front edge of the water outlet screen; on the bottom of the biochemical pool near the water outlet, the biochemical pool There are auxiliary aeration pipes corresponding to the outlet screen at the end of the wall.

In order to minimize the leakage rate of MBBR feed from the outlet screen, and at the same time not increase the probability of the outlet screen being blocked by MBBR feed due to the small mesh size of the outlet screen, the mesh size of the outlet screen is preferably the same Adjacent to a rhombus with internal angles of 120° and 60° respectively, the side length a of the rhombus is calculated by the following formula:

a＝(0.85R ² +0.8L ² )^(1/2)

In the formula:

L——The length (mm) of hollow cylindrical MBBR additive particles,

R——the outer diameter (mm) of hollow cylindrical MBBR additive particles.

The working principle of the present invention is:

When the biochemical tank is in normal operation, the aeration pipe at the water outlet does not work, and the aeration pipe and auxiliary aeration pipe work. Once the MBBR additives are gathered near the outlet screen, under the joint action of the gas in the aeration pipe and the auxiliary aeration pipe, they will circulate and leave the outlet screen. The mesh of the outlet screen will not be blocked by the MBBR addition, ensuring The sewage passes through the outlet screen smoothly, and then flows out from the outlet. During this process, a small amount of MBBR additives will pass through the water outlet screen. Over time, these leaked MBBR additives will accumulate at the water outlet, increasing the resistance of the water outlet, and the water level in the outlet screen (normally This water level is lower than the biochemical pool water level) rises. When the water level in the water outlet screen is higher than the control water level, the valve of the aeration pipe at the water outlet is automatically controlled by the water level gauge, and the aeration of the aeration pipe at the water outlet is used to blow this part of the MBBR material back to the front of the water outlet screen. pool water, thus effectively preventing these leaked MBBR additives from clogging the water outlet of the biochemical pool. When the water level in the water outlet screen returns to below the control water level, the valve of the aeration pipe at the water outlet is closed, the aeration pipe at the water outlet stops aeration, and the system resumes normal operation.

Beneficial effects of the present invention:

1. Utilizing the device of the present invention can effectively prevent the water outlet of the biochemical pool from being blocked by MBBR feeding, and avoid the phenomenon of sewage overflow affecting equipment operation and loss of MBBR feeding caused by blocking the water outlet of the biochemical pool due to MBBR feeding.

2. The mesh of the outlet screen adopts rhombus with internal angles of 120° and 60°, and the size of the rhombus is obtained according to the calculation formula according to the size of the MBBR filler, which can reduce the leakage rate of the MBBR filler from the outlet screen to a minimum. The lowest, while not affecting the water permeability of the outlet screen.

3. The present invention can be used to transform the existing biochemical treatment sewage pool, and also can add the device of the present invention when building a new sewage pool.

4. The present invention is simple in structure and easy to install; adopts automatic control, easy to operate and reliable in performance.

Description of drawings

Fig. 1 is the structural representation of adopting the biochemical pond of the present invention;

Fig. 2 is the three-dimensional stereogram of MBBR adding material among Fig. 1;

Fig. 3 is a schematic diagram of meshes of the outlet screen in Fig. 1 .

In the figure: 1-biochemical pool wall, 2-water outlet, 3-(original) aeration pipe, 4-auxiliary aeration pipe, 5-material baffle, 6-water outlet screen, 7-water outlet Aeration pipe, 8-air pipe, 9-valve, 10-water level in the outlet screen, 11-biochemical tank water level, 12-MBBR feed.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is a schematic diagram of the structure of a biochemical pool adopting the present invention. The sewage treated by the biochemical pool is domestic sewage. The length, width and height of the biochemical pool are calculated according to the scale of sewage treatment and water quality. There is a water outlet 2 on the wall 1 of the biochemical pool at one end, and the water outlet is the side length 300-1000mm circular hole. The added MBBR material is a polymer material with a density of 0.99. Its shape is shown in Figure 2. It is a hollow cylindrical particle. The length L and outer diameter R of the particle are both 10mm. The design water level of the biochemical pool is 500mm from the inner bottom of the pool.

As shown in Figure 1, the device of the present invention adopted in this biochemical pool includes a water outlet screen 6 placed at the front of the water outlet 2 and having a U-shaped longitudinal section. The water outlet screen is made of carbon steel anti-corrosion or stainless steel. The back side of the water outlet is attached to the inner side of the biochemical pool wall 1 where the water outlet is located, and its lower end is 250mm lower than the water outlet, and the water outlet is covered. The bottom edge of the water outlet screen is 350mm wide, and the upper edge of the front of the water outlet screen is higher The water level of the chemical tank is 11 (design water level) 350mm. In order to minimize the leakage rate of MBBR additives from the water outlet screen, and at the same time prevent the water outlet screen from being blocked, after a large number of experiments and optimization, the mesh shape of the water outlet screen is preferably as shown in Figure 3. The inner angles are respectively The diamond-shaped mesh is 120° and 60° (the angle can effectively prevent the cylindrical particles from being stuck on the mesh); according to the size of the MBBR additive particles, the side length a of the diamond-shaped mesh is calculated to be 12.8mm, which is The diamond-shaped mesh can ensure that the leakage rate of MBBR feed particles from the outlet screen is minimized without the outlet screen being blocked by MBBR feed. In order to prevent the MBBR leaking from the water outlet screen from blocking the water outlet, the water outlet aeration pipe 7 is installed on the bottom surface of the U-shaped water outlet screen, and the water outlet aeration pipe passes through the air pipe 8 (air pipe) passing through the wall of the biochemical pool There is a waterproof seal with the pool wall) and the valve 9 is connected with the air source. On the inner wall of the biochemical pool above the water outlet hole, a baffle plate 5 bent 150° towards the pool is fixedly installed. The baffle plate is made of carbon steel anti-corrosion or stainless steel, and the upper edge of the baffle plate should be higher than the outlet screen. the top edge of the front. Install three rows of auxiliary aeration pipes 4 at the bottom of the biochemical pool near the end of the wall of the biochemical pool where the water outlet is located. The auxiliary aeration pipes are installed between the originally designed aeration pipes 3 of the biochemical pool, keeping an equidistant distance from each other, and making the auxiliary The aeration head of the aeration pipe 4 is 10-15cm higher than the aeration head of the aeration pipe 3, and the auxiliary aeration pipe and its aeration head are all made of finished microporous aeration discs.

The control water level (not shown) of the aeration pipe aeration at the water outlet of the biochemical pool is set to be 100 mm lower than the water level 11 of the biochemical pool. During normal operation, aeration is performed by the aeration pipe and auxiliary aeration pipe at the bottom of the pool. When the water level 10 in the outlet screen is higher than the set control water level, it means that the water outlet is filled by the MBBR leaking from the outlet screen. At this time, the valve of the aeration pipe at the water outlet is automatically controlled by the water level meter to open, and the aeration of the aeration pipe at the water outlet is used to blow these MBBR additives back to the pool water in front of the water outlet screen to prevent these leaks The MBBR feed blocked the water outlet of the biochemical pool.

Claims (1)

1. The utility model provides a prevent that MBBR from adding the device that blocks up biochemical pond delivery port which characterized in that: the device comprises a water outlet screen (6) which is arranged at the front part of a water outlet (2) and has a U-shaped longitudinal section, the back edge of the water outlet screen is attached to the inner side of the biochemical pool wall (1) where the water outlet is positioned and covers the water outlet, the upper edge of the front edge of the water outlet screen is 300-400 mm higher than the water level of the biochemical pool, and the width of the bottom edge of the water outlet screen is 350mm; a water outlet aeration pipe (7) connected with an air source through an air conveying pipe (8) and a valve (9) is arranged on the bottom surface of the water outlet screen; a baffle plate (5) which is bent in the biochemical pool and the upper edge of which is higher than the upper edge of the front edge of the water outlet screen is arranged on the inner wall of the pool wall (1) of the biochemical pool above the water outlet hole; an aeration pipe (3) is arranged on the bottom surface of the biochemical tank, an auxiliary aeration pipe (4) corresponding to the water outlet screen is arranged at the end part of the tank wall of the biochemical tank, which is close to the water outlet, on the bottom surface of the biochemical tank, and the aeration head of the auxiliary aeration pipe (4) is 10-15 cm higher than that of the aeration pipe (3);

the adjacent inner angles of the meshes of the water outlet screen (6) are rhombuses with 120 degrees and 60 degrees respectively, and the side length a of each rhombus is calculated by the following formula:

a=（0.85R ² +0.8L ² ）^（1/2）

in the formula:

l is the length of the hollow cylindrical MBBR charging particles,

r is the outer diameter of the hollow cylindrical MBBR filler particles.

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