CN116282523A - Anaerobic Tank Sludge Removal Cooperative Sand Removal System and Method - Google Patents

Abstract

The invention provides a sludge discharging collaborative sand removing system and method of an anaerobic tank, wherein the system comprises a filter arranged at an inlet of the anaerobic tank, a sand sucking pump, a sludge discharging pipe and a circulating flushing pump, wherein the inlet of the sand sucking pump is connected with an outlet at the bottom of the anaerobic tank, one end of the sludge discharging pipe is connected with the outlet at the top of the anaerobic tank, the other end of the sludge discharging pipe and the outlet of the sand sucking pump are both connected with the top of a biogas tank, the sand sucking pump is connected with the outlet at the bottom of the anaerobic tank through the sand discharging pipe, and the outlet of the circulating flushing pump is connected with the sand discharging pipe through the flushing pipe.

Description

Anaerobic Tank Sludge Removal Cooperative Sand Removal System and Method

technical field

The invention relates to the technical field of anaerobic treatment, in particular to an anaerobic tank sludge discharge and sand removal system and method.

Background technique

Anaerobic fermentation tank is the key equipment in the sewage treatment process of environmental protection projects. The material entering the anaerobic fermentation tank will inevitably contain solid particles such as sand and stones. During the anaerobic fermentation process, these solid particles will gradually accumulate at the bottom of the tank. If there is no effective design for removing sand at the bottom, sedimentation will be formed. In addition, the material in the anaerobic fermentation tank is rich in elements such as nitrogen, phosphorus, calcium and magnesium, and sand will accumulate at the bottom for a long time, which will easily produce struvite and other substances, resulting in Loss of effective volume at the bottom of the tank.

At present, there are many designs for sand discharge in anaerobic fermentation tanks, such as erecting a sand discharge screw at the bottom of the anaerobic tank for sand discharge, or directly using a sand discharge pump to directly extract the sediment from the bottom of the anaerobic tank, and then send it to the dehydration tank. The system performs dehydration, but the above methods either need to independently set up equipment such as sand discharge tanks and wave discharge spirals, and the equipment investment is high, or there is a defect that the pipeline is easy to be blocked, and it is difficult to effectively discharge sand. At the same time, the existing design also has the risk of odor leakage.

Contents of the invention

In view of the defects in the prior art, the purpose of the present invention is to provide a system and method for anaerobic tank sludge discharge and sand removal.

According to the present invention, an anaerobic tank mud discharge cooperative sand removal system includes a filter arranged at the inlet of the anaerobic tank, a sand suction pump whose inlet is connected to the bottom outlet of the anaerobic tank, and one end connected to the top of the anaerobic tank The outlet mud discharge pipe and circulating flushing pump, the other end of the mud discharge pipe and the outlet of the sand suction pump are connected to the top of the biogas slurry tank, and the sand suction pump is connected to the bottom of the anaerobic tank through the sand discharge pipe exit.

The outlet of the circulating flushing pump is connected to the sand discharge pipe through a flushing pipe.

According to a method for synergistic desanding of anaerobic tank sludge discharge provided by the present invention, the biogas slurry entering the anaerobic tank first passes through the filter to remove the large particle size sand in the biogas slurry, and then connects with the outlet at the bottom of the anaerobic tank The sand suction pump removes the small particle size sand in the biogas slurry. The outlet on the top of the anaerobic tank is connected to one end of the sludge discharge pipe, and the other end of the sludge discharge pipe and the outlet of the sand suction pump are connected to the bottom of the biogas slurry tank. At the top, the inlet of the sand suction pump is connected to the bottom outlet of the anaerobic tank through a sand discharge pipe, wherein the sand discharge pipe is continuously or discontinuously dredged through a circulating flushing pump to prevent the sand discharge pipe from being blocked.

Preferably, both the anaerobic tank and the biogas slurry tank are fully enclosed.

Preferably, the outlet of the sand suction pump is provided with a flow meter.

Preferably, a control unit is also configured, and the control unit is respectively connected to the circulating flushing pump, the sand suction pump and the flow meter in signal connection.

Preferably, the control unit can control the sand suction pump to stop and at the same time control the circulating flushing pump to start and stop after running for a first period of time according to the set program, and then start the sand suction pump, wherein the The circulation flushing pump is started at a set interval or when the flow meter is lower than a set threshold.

Preferably, the filtering precision of the filter is 4 mesh to 6 mesh.

Preferably, the outlet of the circulating flushing pump is provided with a check valve.

Preferably, a balance pipe is provided between the anaerobic tank and the biogas slurry tank.

Preferably, the inlet of the circulating flushing pump is connected to the middle part of the anaerobic tank, and the middle part is located between the bottom outlet and the top outlet of the anaerobic tank.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention cancels the method that the traditional anaerobic tank needs to be provided with a separate sand discharge facility, and reduces the traditional equipment investment that requires a sand-water separator, a sand discharge screw, and a sand discharge tank. The water in the anaerobic tank is first pretreated by a filter Remove large particle size sand, and then use the bottom closed pipeline suction, sludge discharge and circular flushing to carry out efficient sand removal, which can effectively prevent the bottom of the anaerobic tank from sand compaction and sand discharge pipe blockage, simplifying the traditional independent drainage. Sand technology, while reducing the environmental risk of odor leakage.

2. In the present invention, the filter is installed at the water inlet end of the anaerobic tank, and the sand with a larger particle size is excluded in advance, which reduces the grit load of the anaerobic tank 3 at the back end, and prevents the sand with a large particle size from affecting the dehydration system at the back end. damage to the equipment.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a structural schematic diagram of the present invention.

The figure shows:

Anaerobic inlet pipe 1

filter 2

Anaerobic tank 3

first mixer 4

Circulation flushing pump 5

Flush pipe 6

Check valve 61

Sand discharge pipe 7

Sand suction pump 8

flow meter 9

Drain pipe 10

Second mixer 11

Biogas slurry tank 12

Dehydration feed pump 13

Dehydration feed pipe 14

Dehydration unit 15

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Example 1:

The present invention provides an anaerobic tank mud discharge cooperative sand removal system, as shown in FIG. The bottom outlet of the tank 3 is connected to the inlet of the sand suction pump 8 through the sand discharge pipe 7, the top outlet of the anaerobic tank 3 is connected to one end of the mud discharge pipe 10, and the other end of the mud discharge pipe 10 and the outlet of the sand suction pump 8 are connected to the biogas slurry tank 12, the inlet of the circulating flushing pump 5 is connected to the anaerobic tank 3, and the outlet of the circulating flushing pump 5 is connected to the sand discharge pipe 7 through the flushing pipe 6.

The present invention also provides a method for synergistic desand removal of sludge from anaerobic tank. The biogas slurry entering the anaerobic tank 3 first passes through the filter 2 to remove the large particle size sand in the biogas slurry. The filtration accuracy of the filter 2 is 4 mesh to 6 mesh, and the filtration accuracy of the filter 2 is preferably 5 mesh. By setting the filter 2, the large particle size sand in the biogas slurry can be removed. On the one hand, it can avoid the blockage of the subsequent pump and the internal parts of the pump. Wear and tear, on the other hand, the large-size grit is not easy to be pumped away, so it can also avoid the accumulation of grit at the bottom of the anaerobic tank 3, which affects the normal sand removal operation. The biogas slurry from which the large particle size is removed enters the anaerobic tank 3, and then the sand suction pump 8 connected to the bottom outlet of the anaerobic tank 3 removes the small particle size grit in the biogas slurry, and the sand suction pump 8 will extract The biogas slurry with small particle size grit is driven into the biogas slurry tank 12, wherein the outlet on the top of the anaerobic tank 3 is connected to one end of the sludge discharge pipe 10, and the other end of the sludge discharge pipe 10 is connected to the top of the biogas slurry tank 12, It is used to overflow into the biogas slurry tank 12 through the sludge discharge pipe 10 when the liquid level of the anaerobic tank 3 reaches the top outlet, so as to maintain the liquid level of the anaerobic tank 3 .

The inlet of the sand suction pump 8 is connected to the bottom outlet of the anaerobic tank 3 through the sand discharge pipe 7, wherein the outlet of the circulation flushing pump 5 is connected to the sand discharge pipe 7, and the inlet of the circulation flushing pump 5 is connected to the middle of the anaerobic tank 3. When the pump 5 is started, the biogas slurry inside the anaerobic tank 3 can be pumped into the sand discharge pipe 7 to flush the sand discharge pipe 7, and the circulating flushing pump 5 can be used to continuously or discontinuously dredge the sand discharge pipe 7 to prevent the sand discharge pipe 7 from clogging.

It should be noted that both the anaerobic tank 3 and the biogas slurry tank 12 are fully enclosed. In order to balance the pressure in the two tanks, a balance pipe is installed between the anaerobic tank 3 and the biogas slurry tank 12. The balance pipe is used to balance The pressure in the anaerobic tank 3 and the biogas slurry tank 12 can effectively ensure that the liquid can flow smoothly from the anaerobic tank 3 to the biogas slurry tank 12 .

The outlet of sand suction pump 8 among the present invention is provided with flowmeter 9, can monitor the working condition of sand suction pump 8 in real time by flowmeter 9, when the flow rate of flowmeter 9 is below normal flow, will consider whether sand discharge pipe 7 In the case of blockage, at this time, the circulating flushing pump 5 can be turned on to flush the sand discharge pipe 7.

The outlet of the circulating flushing pump 5 is provided with a check valve 61, which can effectively prevent the biogas slurry and small grains of sand in the sand discharge pipe 7 from flowing into the circulating flushing pump 5 and blocking the impeller inside the circulating flushing pump 5.

In order to increase the flushing effect, the inlet of the circulating flushing pump 5 is connected to the middle of the anaerobic tank 3 and the position of the middle is between the bottom outlet and the top outlet of the anaerobic tank 3, so that the biogas slurry extracted by the circulating flushing pump 5 imports as little as possible. Miscellaneous sand settling improves the flushing effect, and reduces the probability of clogging the sand discharge pipe 7 through intermittent flushing of the sand discharge pipe 7, making the sand suction pump 8 work more efficiently and ensuring high efficiency of sand removal.

Example 2:

This embodiment is a modification example of Embodiment 1.

In this embodiment, a control unit is also configured, and the control unit is respectively connected to the circulating flushing pump 5, the sand suction pump 8, and the flow meter 9. According to the data information collected by each flow meter, liquid level gauge, pressure gauge, etc. of the system, the control unit May be able to control the sand suction pump 8 to stop according to the set program and simultaneously control the circulation flushing pump 5 to start and stop after running for the first period of time and then start the sand suction pump 8 to continue the sand removal operation.

In this embodiment, the circulation flushing pump 5 is started at a set interval or when the flow meter 9 is lower than the set threshold. That is to say, the present invention can set the circulation flushing pump 5 to start regularly to flush the sand discharge pipe 7, that is, start the circulation flushing pump 5 to flush the sand discharge pipe 7 once after a fixed period of time; the present invention can also be based on When the collected flow information, liquid level information or other information is abnormal compared with the preset threshold value, the circulation flushing pump 5 is restarted to realize the flushing of the sand discharge pipe 7 .

The working principle of the present invention is as follows:

As shown in Figure 1, at first, the anaerobic tank 3 is provided with a first agitator 4, the anaerobic water inlet pipe 1 is connected to the inlet of the filter 2, the outlet of the filter 2 is connected to the anaerobic tank 3, and the water intake of the anaerobic tank 3 is first After being filtered by the filter 2 to remove the grit with a larger particle size, it enters the anaerobic tank 3, and the filtration precision of the filter 2 is preferably 5 mesh.

Secondly, the water inlet end of the mud discharge pipe 10 is connected to the anaerobic tank 3, the water outlet end of the mud discharge pipe 10 is connected to the mud storage tank 12, and the anaerobic tank 3 discharges the mud-water mixture into the biogas slurry tank by way of high overflow 12.

Again, sand discharge pipe 7 is arranged at the bottom of anaerobic tank 3, and sand discharge pipe 7 is connected with sand suction pump 8, and the outlet end of suction sand pump 8 is provided with flow meter 9, and the sand settling at the bottom of anaerobic tank 3 is sucked by sand suction pump 8. The sand is pumped into the biogas slurry tank 12.

Fourth, the sand discharge pipe 7 is connected to the flushing pipe 6, the flushing pipe 6 is connected to the circulating flushing pump 5, and the water inlet pipe of the circulating flushing pump 5 is connected to the middle of the anaerobic tank 3. Before the sand discharge of the anaerobic tank 3 and when the sand suction pipe 7 is blocked, the circulation flushing pump 5 is started to flush the sand discharge pipe 7, and the biogas slurry in the upper part of the anaerobic tank 5 is pumped into the bottom of the anaerobic tank 3 to prevent sand settling and hardening. It can prevent the sand discharge pipe 7 from clogging.

Finally, the top of the biogas slurry tank 12 is provided with a second agitator 11, and the bottom of the biogas slurry tank 12 is connected to the dehydration feed pump 13 through a pipeline. The material pump 13 is pressurized and enters the dehydration unit 15 through the dehydration feed pipe 14, thereby realizing the separation of sand (mud) and water. In the present invention, the biogas slurry tank 12 jointly receives the grit and sludge in the anaerobic tank 3 and pumps them into the dewatering unit 15, thereby realizing the coordinated dehydration treatment of the sludge and sand.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (10)

1. The utility model provides a mud is degritting system in coordination with anaerobic tank arranges, its characterized in that, including arranging filter (2) in anaerobic tank (3) import, access connection sand sucking pump (8), one end of anaerobic tank (3) bottom export are connected mud discharging pipe (10) and circulating flushing pump (5) of anaerobic tank (3) top export, the other end of mud discharging pipe (10) sand sucking pump (8) export all is connected the top of natural pond fluid reservoir (12), sand sucking pump (8) are connected anaerobic tank (3) bottom export through sand discharging pipe (7).

The outlet of the circulating flushing pump (5) is connected with the sand discharge pipe (7) through a flushing pipe (6).

2. The utility model provides a big particle diameter sand setting in the biogas slurry is got rid of to anaerobic jar mud discharging cooperation sand removal method, its characterized in that, the biogas slurry that gets into in anaerobic jar (3) is got rid of through filter (2) earlier, and the small particle diameter sand setting in the biogas slurry is got rid of through sand suction pump (8) that link to each other with anaerobic jar (3) bottom export, the one end of mud discharge pipe (10) is connected to anaerobic jar (3) top export, the top of biogas tank (12) is all connected to mud discharge pipe (10) other end and sand suction pump (8) export, sand suction pump (8) import is connected anaerobic jar (3) bottom export through sand discharge pipe (7), wherein, sand discharge pipe (7) are through circulating flushing pump (5) continuous or discontinuous dredging in order to prevent sand discharge pipe (7) jam.

3. The system or the method according to claim 1 or 2, characterized in that the anaerobic tank (3) and the biogas tank (12) are of a fully closed design.

4. A system or a method according to claim 1 or 2, characterized in that the outlet of the sand suction pump (8) is provided with a flow meter (9).

5. The system or method according to claim 4, characterized in that a control unit is also provided, which is in signal connection with the circulation flushing pump (5), the sand suction pump (8), the flow meter (9), respectively.

6. A system or method according to claim 5, characterized in that the control unit is able to control the sand suction pump (8) to stop and simultaneously control the circulation flushing pump (5) to start and to stop after a first period of operation and then to start the sand suction pump (8) according to a set program, wherein the start of the circulation flushing pump (5) is performed at set intervals or after the flow meter (9) is below a set threshold value.

7. The system or the method according to claim 1 or 2, characterized in that the filter (2) has a filtering precision of 4-6 mesh.

8. A system or a method according to claim 1 or 2, characterized in that the outlet of the circulation flushing pump (5) is provided with a non-return valve (61).

9. The system or the method according to claim 1, characterized in that a balancing pipe is provided between the anaerobic tank (3) and the biogas tank (12).

10. The system according to claim 1 or 2, characterized in that the inlet of the circulation flushing pump (5) is connected to the middle part of the anaerobic tank (3) and the position of the middle part is between the bottom outlet and the top outlet of the anaerobic tank (3).

Images