CN210814082U - Sand and scale removal device in landfill leachate anaerobic treatment system - Google Patents

Abstract

The utility model relates to a sand and scale removal device in an anaerobic treatment system for landfill leachate, wherein: a water inlet guide part is connected with a water inlet pipe section equipped with a hydraulic sand washing mixer; The effluent collection part is equipped with an effluent triangular weir and an effluent annular collection tank; the sand scale discharge part is equipped with a screw pressing conveyor and a sand water separation and discharge pipe. The water flow enters the circular and conical cylinders of the hydrocyclone sand removal, and the sand scale settles and accumulates in the sand scale collection bucket under the action of the cyclone paddle agitator. The water flows upward through the deflector inclined plate or inclined pipe, and the rising water is collected and discharged from the system through the clear liquid outlet pipe. The sand scale is lifted by the conveying of the screw press conveyor, dewatered by pressing, and the fine sand and scale blocks are discharged from the system. The utility model integrates the functions of sand washing, sand settling and sand-water separation into an integrated device, so that the anaerobic treatment system of leachate can be continuously transported and emptied, and the efficient and stable operation can be realized.

Description

Sand and scale removal device in landfill leachate anaerobic treatment system

technical field

The utility model relates to the technical field of landfill leachate treatment and the related field of waste water treatment equipment, in particular to a device for sand removal of an anaerobic treatment system for leachate of a domestic waste incineration plant and a sand and scale removal device for discharging inorganic sediments.

Background technique

At present, my country's garbage classification and collection system is not perfect, and domestic garbage is easily mixed into inorganic garbage such as fine sand produced by road cleaning; the landfill leachate itself contains high inorganic salts, and these inorganic substances will eventually enter the landfill leachate treatment system. In my country, the general treatment process for landfill leachate produced by domestic waste incineration plants is "anaerobic + nitrification and denitrification membrane bioreactor". Due to the relatively long hydraulic retention time and sludge retention time of the anaerobic treatment system in the process, fine sand is easy to accumulate in the system, causing the reactor and pipeline to be blocked. On the other hand, the pH value in the anaerobic treatment system is generally alkaline, and the concentration of calcium and magnesium ions in the landfill leachate is extremely high, which will easily form inorganic deposits, causing scaling of equipment and blockage of pipelines. Bad for normal operation.

Therefore, the landfill leachate needs to be discharged from the system in time for the fine sand and the formed inorganic scale deposits in the anaerobic system. The conventional sand removal and descaling method in the anaerobic system is to dredging and replacing the anaerobic system after the anaerobic system is stopped and emptied, which easily leads to the system restart time and operation time being too long, which cannot meet the requirements of the treatment system for uninterrupted operation.

At present, there is also a treatment method that adopts the sand settling and sand removal methods in the traditional sewage treatment process. Most of the traditional methods such as sand settling tanks and sand-water separators are used, but the equipment of the traditional sewage treatment process is directly applied to the landfill leachate. The sand and scale removal in the anaerobic treatment system has the following defects:

1. The particle size of inorganic solids in the anaerobic system is small and cannot be effectively removed by traditional methods.

2. A large amount of anaerobic sludge adheres to the surface of fine sand and inorganic solid scale in the anaerobic system. It is difficult to clean the sludge on the solid surface by traditional methods. The directly discharged fine sand and inorganic matter contain sludge, which is easy to cause Secondary environmental pollution and severe odor can easily lead to the loss of sludge in the anaerobic system.

3. Most of the traditional sewage treatment processes adopt the separate design of sand settling and sand removal, that is, the sand settling device and the sand-water separation device are set separately, which occupies a large area.

4. In the traditional sewage treatment process, the number of equipment for sand washing, sand settling and sand water separation is large, and the failure rate is high, especially the sand lifting device is easy to block after long-term operation.

In view of this, those skilled in the art are devoted to developing a kind of sand discharge and cleaning system that can keep the leachate anaerobic treatment system emptied continuously, can efficiently remove fine sand and scale blocks, and realize the efficient and stable operation of the leachate anaerobic treatment system. A device for discharging inorganic deposits to solve the problems existing in the above-mentioned treatment methods.

Utility model content

The task of the utility model is to provide a sand and scale removal device in the landfill leachate anaerobic treatment system, which integrates the functions of sand washing, sand settling and sand-water separation into an integrated device, aiming to realize the maintenance of anaerobic leachate. The treatment system is continuously emptied to achieve efficient removal of fine sand and scale blocks, and to achieve efficient and stable operation of the leachate anaerobic treatment system. It leads to problems such as blockage and deposition, reducing treatment efficiency and shortening the service life of anaerobic treatment system, which has good practical application value.

The technical solution of the present utility model is as follows:

A sand and scale removal device in a landfill leachate anaerobic treatment system, comprising a frame, a hydraulic sand washing mixer, a water inlet diversion part, a sand water separation part, an effluent collection part, a sand scale discharge part and a connecting pipeline;

The water inlet guide part is a circular cylinder, the circular cylinder is installed on the frame, the water inlet guide part is connected to the water inlet pipe section, and a hydraulic sand washing mixer is installed on the water inlet pipe section; the water inlet guide part The middle part of the circular cylinder is provided with a deflector inclined plate or inclined pipe;

The sand-water separation part is a conical cylinder, the circular cylinder part of the conical cylinder is installed under the water inlet guide part and connected with the bottom of the circular cylinder, and the top of the sand-water separation part is equipped with a swirl blade The swirling paddle agitator consists of a pendant shaft with a helical body and a horizontal axis. The horizontal axis is installed at the bottom end of the pendant axis, and there are several inclined paddles evenly distributed on the horizontal axis. , the horizontal axis is located in the middle of the conical cylinder of the sand-water separation part, and a sand scale collection bucket and a sand separation control valve are installed at the outlet of the bottom of the conical cylinder;

The water outlet collection part is located above the sand-water separation part, the water outlet collection part is equipped with a water outlet triangular weir and a water outlet annular collection tank, and the water outlet triangular weir is arranged on the top of the circular cylinder of the water inlet guide part and is located on the guide inclined plate or Above the inclined pipe, the water outlet annular collection tank is installed on the outer ring of the circular cylinder and is connected to the clear liquid outlet pipe. The system is discharged through the clear liquid outlet pipe into the inlet or circulation pipeline of the leachate anaerobic treatment system;

The sand scale discharge part is arranged below the sand scale collection bucket at the outlet of the conical cylinder of the sand water separation part. The sand scale discharge part is equipped with a screw pressing conveyor and a sand water separation discharge pipe. It is installed obliquely on the ground, the power part of the screw press conveyor is located on the ground, the conveying part of the screw press conveyor is inclined upward, and the outlet part of the screw press conveyor is located at the top; the screw press conveyor is equipped with a screw vent valve, sand and scale separation The liquid level control valve and the sensor located at the outlet of the screw press conveyor. When the sand and scale collection bucket at the bottom of the sand-water separation part collects fine sand and scale blocks, the sensor in the sand and scale discharge part senses the outlet part of the screw press conveyor. No sand and scale blocks fall, operate the screw vent valve, sand separation control valve and sand scale separation liquid level control valve, the sand scale is transported and lifted through the oblique spiral body of the screw press conveyor, press and dewater, and discharge the fine sand and scale blocks. In this system, the drainage is connected to the inlet or circulation pipeline of the leachate anaerobic treatment system through the sand-water separation and discharge pipe.

The hydraulic sand washing mixer is equipped with a series of double Y-shaped diversion devices.

The hydraulic sand washing mixer is provided with a front valve and a rear valve respectively at the front and rear positions of the installation part of the water inlet pipe section.

A middle position water outlet pipe is arranged on the conical cylinder of the sand-water separation part, and a middle position water outlet pipe is provided with a middle position vent valve, and the middle position water outlet pipe is connected with the clear liquid outlet pipe.

The sand and scale removal device is equipped with a programmable control device, which synchronously controls the switches of the sand separation control valve, the spiral vent valve and the sand scale separation liquid level control valve, as well as the operation of the screw press conveyor, so as to realize the sand and scale discharge part. The sequence batch mode runs automatically.

A guide plate is arranged in the circular cylinder of the water inlet guide part, the distance between the guide plate and the circular cylinder is 5-15mm, and the guide length of the guide plate is 0.3-0.5 times the diameter of the cylinder.

The angle at which the circular cylinder of the water inlet guide part is connected with the conical cylinder of the sand-water separation part is 15°˜30°.

The height of the oblique guide plate or the oblique tube area of the water inlet guide part is 0.6-1.0 m, and the installation inclination angle is 60°-75°.

According to the sand and scale removal device in a landfill leachate anaerobic treatment system of the utility model, the functions of sand washing, sand settling and sand-water separation are designed and integrated into an integrated device, which can realize the continuous maintenance of the leachate anaerobic treatment system. It is emptied to realize the efficient removal of fine sand and scale, and realize the efficient and stable operation of the leachate anaerobic treatment system.

The sand and scale removal device in the landfill leachate anaerobic treatment system of the utility model can realize the integration of the functions of sand washing, sand settling and sand removal, and has the advantages of simple structure, reasonable design, saving floor space, convenient operation and use, and easy operation. It has the advantages of low maintenance cost, etc.; it can achieve stable sand removal and descaling of the leachate anaerobic treatment system, while avoiding the risk of anaerobic sludge loss; and improve the operating efficiency and service life of the anaerobic treatment system.

The sand and scale removal device of the utility model can produce a higher removal effect on the fine sand and scale blocks accumulated after a long-term operation of the leachate anaerobic treatment system, and can remove the fine sand and scale blocks with a particle size larger than 0.2 mm in the anaerobic system. Sand removal. The device realizes the continuous operation of the effluent of the cyclone desanding and descaling, and the batch operation of the sand discharging sequence, which improves the operation stability of the equipment. The device can optimize the set monitoring device, realize automatic control operation through PLC, improve the working efficiency of automatic operation, and ensure a good treatment effect. The device does not cause the loss of sludge in the anaerobic system while realizing the function of sand removal and descaling.

Description of drawings

Figure 1 is a schematic structural diagram of a sand and scale removal device in a landfill leachate anaerobic treatment system of the present invention.

Reference number:

1 is the water inlet pipe section, 2 is the front valve, 3 is the hydraulic sand washing mixer, 4 is the rear valve, 5 is the water inlet diversion section, 6 is the sand-water separation section, 7 is the swirl paddle mixer, 8 It is the neutral vent valve, 9 is the guide inclined plate or inclined pipe, 10 is the outlet triangular weir, 11 is the outlet water collection part, 12 is the clear liquid outlet pipe, 13 is the sand separation control valve, 14 is the sand scale discharge part, 15 is a screw press conveyor, 16 is a screw vent valve, 17 is a sand scale separation liquid level control valve, and 18 is a sand water separation discharge pipe.

Detailed ways

The present utility model will be described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to Figure 1, the present utility model provides a sand and scale removal device in an anaerobic treatment system for landfill leachate, which is mainly composed of a frame, a hydraulic sand washing mixer 3, a water inlet diversion part 5, a sand water separation part 6, The effluent collection part 11, the sand scale discharge part 14 and the connecting pipeline are composed.

The water inlet guide portion 5 is a circular cylinder, and the circular cylinder is installed on the frame. The water inlet guide part 5 is connected to the water inlet pipe section 1, and the hydraulic sand washing mixer 3 is installed on the water inlet pipe section 1 through a flange. The hydraulic sand washing mixer 3 is equipped with double Y-shaped diversion devices in series. The ratio of the length of the Y-shaped diversion body to the diameter of the water inlet pipe is 2:1 to 2.5:1, and the middle angle of the Y-shaped diversion body is 30°. ~45°. The hydraulic sand washing mixer 3 is respectively equipped with a front valve 2 and a rear valve 4 at the front and rear positions of the installation part of the water inlet pipe section 1 . A guide plate is arranged in the circular cylinder of the water inlet guide part 5, the distance between the guide plate and the circular cylinder is 5-15mm, and the guide length of the guide plate is 0.3-0.5 times the diameter of the cylinder. The central part of the circular cylinder of the water inlet guide part 5 is provided with a guide inclined plate or inclined pipe 9, the height of the area of the guide inclined plate or inclined pipe 9 is 0.6-1.0 m, and the installation inclination angle is 60°-75°. The distance between the inclined plates or the diameter of the pipe is about 50 to 150 mm.

The sand-water separation part 6 is a conical cylinder, and the circular cylinder part of the conical cylinder is installed under the water inlet guide part 5 and connected with the bottom of the circular cylinder. The angle at which the circular cylinder of the water inlet guide part 5 is connected with the conical cylinder of the sand-water separation part 6 is 15° to 30°. A swirling paddle stirrer 7 is installed on the top of the sand-water separation part 6 . The swirling paddle agitator 7 is composed of a pendant shaft with a helical body and a horizontal axis. The length of the pendant axis is 3 to 5m. The horizontal axis is installed at the bottom end of the pendulous axis. 6 in the middle of the conical cylinder. Several inclined blades are evenly arranged on the horizontal axis. The diameter of the blades is 0.95 to 0.98 times the diameter of the bottom of the sand-water separation part 6. The distance between the top of the blade and the tank wall is determined according to the critical particle size of the material. Generally not less than 10mm. A sand scale collection bucket and a sand separation control valve 13 are installed at the outlet of the bottom of the conical cylinder. The conical cylindrical body of the sand-water separation part 6 is provided with a middle water outlet pipe, and a middle position vent valve 8 is installed on the middle position water outlet pipe, and the middle position water outlet pipe is connected to the clear liquid outlet pipe 12 .

The outlet water collection part 11 is located above the sand-water separation part 6 . The outlet collecting part 11 is equipped with an outlet triangular weir 10 and an outlet annular collecting tank. The water outlet triangular weir 10 is arranged on the top of the circular cylinder of the water inlet guide portion 5 and above the guide inclined plate or inclined pipe 9 . The water outlet annular collection tank is installed on the outer ring of the circular cylinder and is connected to the clear liquid outlet pipe 12 . The effluent that is diverted and ascended by the diversion inclined plate or inclined pipe 9 overflows through the outlet triangular weir 10, flows into the effluent annular collection tank, and then is discharged from the system through the clear liquid outlet pipe 12, and enters the influent of the leachate anaerobic treatment system. or in the circulation line.

The sand and scale discharge part 14 is arranged below the sand and scale collection bucket at the outlet of the conical cylindrical body of the sand-water separation part 6 . The sand scale discharge part 14 is equipped with a screw press conveyor 15 and a sand water separation and discharge pipe 18 . The screw press conveyor 15 is installed obliquely in a sealed manner, the power part of the screw press conveyor 15 is located on the ground, the conveying part of the screw press conveyor 15 is inclined upwardly, and the outlet part of the screw press conveyor 15 is located on the top. The screw press conveyor 15 is equipped with a screw vent valve 16 , a sand scale separation liquid level control valve 17 and a sensor located at the outlet of the screw press conveyor 15 . When the sand and scale collection bucket at the bottom of the sand-water separation part 6 collects the fine sand and scale blocks, the sensor of the sand and scale discharge part 14 senses that there is no sand and scale blocks falling at the outlet of the screw press conveyor 15, and operates the screw vent valve 16, The sand separation control valve 13 and the sand scale separation liquid level control valve 17, the sand scale is transported and lifted by the oblique spiral body of the screw press conveyor 15, pressed and dehydrated, and the fine sand and scale blocks are discharged from the system, and at the same time, the sand and water are separated and discharged. Pipe 18 connects the drain to the feed or circulation line of the leachate anaerobic treatment system.

The sand and scale removal device in the landfill leachate anaerobic treatment system of the present invention is equipped with a programmable control device, which synchronously controls the switches of the sand separation control valve 13, the spiral vent valve 16 and the sand and scale separation liquid level control valve 17. And the operation of the screw press conveyor 15 realizes the automatic operation of the sequence batch type of the sand scale discharge part 14 .

As shown in Figure 1, the utility model provides an implementation process of a sand and scale removal device in a landfill leachate anaerobic treatment system, the details are as follows:

The water flow containing the mixture is discharged from the drainage port or mud outlet at the bottom of the anaerobic system, and enters the water inlet pipe section 1 and the hydraulic sand washing mixer 3. In the hydraulic sand washing mixer 3, the action of hydraulic turbulence is used to strengthen the friction cleaning of the mixture and remove it. Anaerobic sludge and organic matter adhering to the surface of the fine sand block.

The water flow after passing through the hydraulic sand washing mixer 3 enters the circular cylinder of the water inlet diversion part 5 and the conical cylinder of the sand water separation part 6 of the hydrocyclone sand removal through the tangential inlet, and passes through the guide in the cylinder. The flow plate groove allows the water flow to flow along the circular cylinder and the conical cylinder to form a hydraulic swirling flow. Along the bottom ramp of the sand-water separation part 6, it gathers into the sand and scale collection bucket.

The water flows upward through the guide inclined plate or inclined pipe 9 arranged in the middle of the circular cylinder of the water inlet guide part 5, and accelerates the sinking of fine sand or scale blocks through the action of the guide inclined plate or inclined pipe 9, and improves the removal of water. The effect of sand removal. The rising effluent overflows through the effluent triangular weir 10, and enters the effluent annular collection tank located on the outer ring of the circular cylinder. After the effluent is collected, it is discharged from the system through the clear liquid outlet pipe 12, and enters the influent or circulation of the leachate anaerobic treatment system. in the pipeline.

After the sand and scale collection bucket at the bottom of the sand-water separation part 6 collects the fine sand and scale blocks, the sensor installed at the outlet of the sand and scale discharge part 14 is used. To run, open the screw vent valve 16 to vent and then close it. Then, the sand separation control valve 13 is opened to fill the sand and scale discharge part 14 with the deposited sand water and scale blocks, and then the sand separation control valve 13 is closed. Then open the sand scale separation liquid level control valve 17, balance the water level of the screw part of the screw press conveyor 15, and then close it. Then turn on the screw press conveyor 15 to carry out the separation operation, and run it after no discharge is detected at the discharge port. Finally, through the sealed oblique screw conveying and lifting, squeezing and dehydration, the fine sand and scale blocks are discharged from the system, and at the same time, the drainage is connected to the inlet or circulation pipeline of the leachate anaerobic treatment system through the sand-water separation and discharge pipe 18. middle.

The sand and scale removal device in the landfill leachate anaerobic treatment system of the utility model can realize the integration of the functions of sand washing, sand settling and sand removal, and has the advantages of simple structure, reasonable design, saving floor space, convenient operation and use, and easy operation. It has the advantages of low maintenance cost, etc.; it can achieve stable sand removal and descaling of the leachate anaerobic treatment system, while avoiding the risk of anaerobic sludge loss; and improve the operating efficiency and service life of the anaerobic treatment system.

Of course, those skilled in the art should realize that the above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention. Variations, modifications, etc. of the examples will fall within the scope of the claims of the present invention.

Claims (8)

1. The utility model provides a degritting scale removal device among landfill leachate anaerobic treatment system which characterized in that: the device comprises a frame, a hydraulic sand washing mixer (3), a water inlet flow guide part (5), a sand-water separation part (6), a water outlet collection part (11), a sand scale discharge part (14) and a connecting pipeline;

the water inlet flow guide part (5) is a circular cylinder, the circular cylinder is arranged on the rack, the water inlet flow guide part (5) is connected with the water inlet pipe section (1), and the water inlet pipe section (1) is provided with the hydraulic sand washing mixer (3); the middle part in the circular cylinder of the water inlet diversion part (5) is provided with a diversion inclined plate or an inclined pipe (9);

the sand-water separation part (6) is a conical barrel, the circular barrel part of the conical barrel is arranged below the water inlet guide part (5) and is connected with the bottom of the circular barrel, the top of the sand-water separation part (6) is provided with a rotational flow paddle type stirrer (7), the rotational flow paddle type stirrer (7) consists of a downward vertical shaft with a spiral line body and a horizontal shaft, the horizontal shaft is arranged at the bottom end of the downward vertical shaft, a plurality of inclined paddles are uniformly distributed on the horizontal shaft, the horizontal shaft is positioned in the middle of the conical barrel of the sand-water separation part (6), and a sand scale collection hopper and a sand setting separation control valve (13) are arranged at the outlet of the bottom of the conical barrel;

the device is characterized in that the effluent collecting part (11) is positioned above the sand-water separating part (6), the effluent collecting part (11) is provided with an effluent triangular weir (10) and an effluent annular collecting tank, the effluent triangular weir (10) is arranged at the top of the circular cylinder of the water inlet flow guiding part (5) and positioned above the flow guiding inclined plate or inclined pipe (9), the effluent annular collecting tank is arranged on the outer ring of the circular cylinder and connected with a clear liquid outlet pipe (12), effluent which is guided by the flow guiding inclined plate or inclined pipe (9) and rises overflows through the effluent triangular weir (10), flows into the effluent annular collecting tank and is discharged out of the system through the clear liquid outlet pipe (12) to enter a water inlet or circulating pipeline of the leachate anaerobic treatment system;

the sand and scale discharging part (14) is arranged below a sand and scale collecting hopper at the outlet of the conical barrel of the sand and water separating part (6), the sand and scale discharging part (14) is provided with a screw press conveyor (15) and a sand and water separating and discharging pipe (18), the screw press conveyor (15) is obliquely arranged in a sealing manner, the power part of the screw press conveyor (15) is positioned on the ground, the conveying part of the screw press conveyor (15) extends upwards in an inclined manner, and the outlet part of the screw press conveyor (15) is positioned at the top of the upper part; the spiral squeezing conveyor (15) is provided with a spiral emptying valve (16), a sand and scale separation liquid level control valve (17) and a sensor positioned at the outlet part of the spiral squeezing conveyor (15), when a sand and scale collecting hopper at the bottom of the sand and water separation part (6) collects fine sand and scale blocks, the sensor of the sand and scale discharge part (14) senses that no sand and scale blocks fall at the outlet part of the spiral squeezing conveyor (15), the spiral emptying valve (16), a sand setting separation control valve (13) and the sand and scale separation liquid level control valve (17) are operated, sand and scale are conveyed and lifted through an inclined spiral body of the spiral squeezing conveyor (15), squeezed and dehydrated, the fine sand and scale blocks are discharged out of the system, and drainage is connected into water inlet or circulation pipelines of the leachate anaerobic treatment system through a sand and water separation discharge pipe (18).

2. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: the hydraulic sand washing mixer (3) is provided with double Y-shaped flow guide devices which are connected in series.

3. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: the hydraulic sand washing mixer (3) is provided with a front valve (2) and a rear valve (4) at the front and rear positions of the arrangement position of the water inlet pipe section (1).

4. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: a middle position water outlet pipe is arranged on the conical barrel of the sand-water separation part (6), a middle position emptying valve (8) is arranged on the middle position water outlet pipe, and the middle position water outlet pipe is connected with a clear liquid water outlet pipe (12).

5. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: the sand and scale removing device is provided with a programmable control device in a matched manner, and synchronously controls the on and off of a sand setting separation control valve (13), a spiral emptying valve (16) and a sand and scale separation liquid level control valve (17) and the operation of a spiral squeezing conveyor (15), so that the sequencing batch automatic operation of a sand and scale discharge part (14) is realized.

6. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: the circular cylinder of the water inlet diversion part (5) is internally provided with a diversion plate, the distance between the diversion plate and the circular cylinder is 5-15 mm, and the diversion length of the diversion plate is 0.3-0.5 times of the cylinder diameter.

7. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: the angle of the connection between the circular cylinder of the water inlet diversion part (5) and the conical cylinder of the sand-water separation part (6) is 15-30 degrees.

8. The device for removing sand and scale in the anaerobic treatment system of landfill leachate according to claim 1, wherein: the height of the diversion inclined plate or inclined pipe (9) area of the water inlet diversion part (5) is 0.6-1.0 m, and the installation inclination angle is 60-75 degrees.

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