Solid-liquid separation and guide discharge device and method for sludge discharged by anaerobic digestion

Abstract

The invention discloses a solid-liquid separation and guide discharge device and method for anaerobic digestion discharged sludge, and belongs to the technical field of anaerobic digestion discharged sludge separation. The device comprises a separation box, a liquid treatment box and a solid treatment box. A solid-liquid separation screen is obliquely arranged in the separation box, a solid outlet and a liquid outlet are formed in the two sides of the screen respectively, and the screen is communicated with the solid treatment box and the liquid treatment box through conveying pipes. And a multi-stage filtering mechanism consisting of a coarse filter screen, a fine filter screen and an activated carbon filter screen is arranged in the liquid treatment box. And a discharging mechanism is arranged on the solid treatment box, comprises driving equipment, a rotating shaft and a stirring plate which is spirally distributed, and is used for assisting solid materials to be smoothly discharged. The solid-liquid separation device is reasonable in structural design, efficient solid-liquid separation is achieved through the inclined screen, the liquid purity is improved in combination with multi-stage filtration, meanwhile, blockage is avoided through forced discharging of the stirring plate, and the solid-liquid separation device has the advantages of being high in separation efficiency, stable in operation, low in secondary pollution risk and the like.

Description

Technical Field

[0001] This invention belongs to the field of anaerobic digestion sludge separation technology, specifically relating to a solid-liquid separation and drainage device and method for anaerobic digestion sludge. Background Technology

[0002] Anaerobic digestion technology, as a highly efficient and sustainable method for treating organic waste, occupies an important position in the fields of environmental protection and waste management. This technology decomposes organic matter through the metabolic activity of microorganisms under anaerobic conditions and is widely used in wastewater treatment plants, agricultural waste treatment, and urban organic waste treatment. The anaerobic digestion process not only effectively degrades organic pollutants but also produces biogas (mainly methane and carbon dioxide) as a renewable energy source, while generating stable digestion residues, namely anaerobic digestion sludge.

[0003] However, the treatment and disposal of anaerobic digestion sludge has become one of the key issues restricting the widespread application of this technology. The sludge typically contains a large amount of water and solid residue, requiring effective solid-liquid separation before direct discharge or resource utilization. Currently, traditional solid-liquid separation methods mainly include gravity sedimentation and centrifugal separation. While these methods can achieve solid-liquid separation to some extent, they still face many technical bottlenecks in practical applications. Specifically, traditional methods generally suffer from low separation efficiency, long processing cycles, large equipment footprints, and the potential risk of secondary pollution. These technical shortcomings not only affect the treatment effect of anaerobic digestion sludge but also restrict the economic efficiency and environmental friendliness of the entire anaerobic digestion technology. Therefore, there is an urgent need to develop a rapid solid-liquid separation and discharge device for anaerobic digestion sludge. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a solid-liquid separation and drainage device and method for anaerobic digestion sludge.

[0005] The specific technical solution adopted in this invention is as follows:

[0006] In a first aspect, the present invention provides a solid-liquid separation and discharge device for anaerobic digestion sludge, comprising a separation tank, a liquid treatment tank, and a solid treatment tank; the top of the separation tank has an inlet for receiving anaerobic digestion sludge, and the bottom has a solid outlet and a liquid outlet respectively; a solid-liquid separation screen is inclinedly arranged inside the separation tank, and the solid outlet and liquid outlet are respectively located on both sides of the solid-liquid separation screen; the solid outlet is connected to the solid treatment tank through a solid conveying pipe, and the liquid outlet is connected to the liquid treatment tank through a liquid conveying pipe;

[0007] The liquid treatment tank is equipped with a filtration mechanism for filtering liquid substances; the solid treatment tank is equipped with a discharge mechanism for assisting the discharge of solid substances; the discharge mechanism includes a drive device located outside the solid treatment tank and a rotating shaft horizontally fixed inside the solid treatment tank, the rotating shaft and the drive device forming a transmission connection; several actuating plates are fixed on the rotating shaft.

[0008] Preferably, the liquid delivery pipe is equipped with a valve for controlling the liquid flow rate.

[0009] Preferably, the filtration mechanism includes a coarse filter, a fine filter, and an activated carbon filter arranged at intervals from top to bottom with decreasing pore sizes; wherein the pore size of the coarse filter is 0.5 to 2.0 mm, and the pore size of the fine filter is 0.1 to 0.5 mm.

[0010] Preferably, the solids handling box is also equipped with a rinsing device for cleaning the actuating plate.

[0011] Furthermore, a water pump for driving the rinsing equipment is provided outside the solids treatment tank.

[0012] Preferably, the actuating plates are spirally distributed circumferentially on the rotating shaft.

[0013] Preferably, the feed inlet is equipped with a distributor for evenly dispersing the anaerobic digestion sludge onto the solid-liquid separation screen.

[0014] Preferably, a vibrator is also fixed on the inner wall of the separation box; the vibrator is connected to the solid-liquid separation screen to prevent the screen from clogging.

[0015] Preferably, the angle between the solid-liquid separation screen and the horizontal plane is set to 15°~45°.

[0016] Secondly, the present invention provides a separation method using the solid-liquid separation and discharge device for anaerobic digestion sludge described in the first aspect, the specific steps of which are as follows:

[0017] S1: The anaerobic digestion sludge to be treated is conveyed to the separation box through the feed inlet, and the sludge is separated by gravity on the inclined solid-liquid separation screen.

[0018] S2: The liquid material carried in the sludge passes through the solid-liquid separation screen under the action of gravity, flows into the liquid outlet and enters the liquid treatment tank through the liquid conveying pipe; the liquid entering the liquid treatment tank flows through the filtration mechanism, and removes suspended solids and impurities through multi-stage filtration to obtain purified liquid product;

[0019] S3: The solid material trapped above the solid-liquid separation screen in the mud discharge slides down the inclined surface of the screen to the solid outlet under the action of gravity, and enters the solid treatment box through the solid conveying pipe.

[0020] S4: Start the drive device. The drive device drives the rotating shaft and the actuating plate to rotate, actuating and pushing the solid material entering the solid material processing box, and assisting the solid material to be discharged from the solid material processing box.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The separation box provided by the present invention is equipped with a solid-liquid separation screen, which can quickly and effectively separate the solid and liquid in the anaerobic digestion sludge, thereby improving the subsequent separation efficiency.

[0023] (2) The solid processing box provided by the present invention is equipped with a discharge mechanism. The drive device drives the spiral agitator to rotate, which forces the solid material to move and push it, avoiding solid accumulation and blockage, and ensuring the thoroughness of solid-liquid separation.

[0024] (3) The liquid treatment tank provided by the present invention is equipped with a filtration mechanism, which adopts a multi-stage gradient filtration consisting of a coarse filter, a fine filter and an activated carbon filter to purify the separated liquid step by step, significantly improving the purity and recyclability of the liquid.

[0025] In summary, the present invention has a reasonable structural design, good solid-liquid separation effect, stable and reliable operation, and effectively solves the problems of low separation efficiency, easy clogging and high risk of secondary pollution in existing technologies, while also having good environmental and economic benefits. Attached Figure Description

[0026] Figure 1 This is an isometric view of the solid-liquid separation and discharge device for anaerobic digestion sludge provided in this embodiment;

[0027] Figure 2 This is a front view of the solid-liquid separation and discharge device for anaerobic digestion sludge provided in this embodiment;

[0028] Figure 3 This is a schematic diagram of the solid processing box provided in this embodiment;

[0029] In the diagram: Separation tank 1, Inlet 1-1, Liquid outlet 1-2, Solid outlet 1-3, Liquid processing tank 2, Solid processing tank 3, Solid conveying pipe 4, Liquid conveying pipe 5, Valve 6, Solid-liquid separation screen 7, Discharge mechanism 8, Drive device 8-1, Rotating shaft 8-2, Actuating plate 8-3, Water pump 9, Filtration mechanism 10, Coarse filter screen 10-1, Fine filter screen 10-2, Activated carbon filter screen 10-3, Washing device 11. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Technical features in the various embodiments of the present invention can be combined accordingly without mutual conflict.

[0031] like Figure 1 and Figure 2 As shown, in a preferred embodiment of the present invention, this embodiment provides a solid-liquid separation and discharge device for anaerobic digestion sludge. The device includes a separation tank 1, a liquid treatment tank 2, a solid treatment tank 3, a solid conveying pipe 4, and a liquid conveying pipe 5.

[0032] In the apparatus provided in this embodiment, the separation box 1 serves as the core unit for achieving preliminary solid-liquid separation, and its structural design has a significant impact on the separation efficiency. Specifically, the top of the separation box 1 has an inlet 1-1 for receiving the anaerobic digestion sludge. As a preferred embodiment, this embodiment provides a distributor at the inlet 1-1. Through the uniform distribution effect of this distributor, the anaerobic digestion sludge can be evenly dispersed onto the solid-liquid separation screen 7, avoiding local accumulation of material, thereby improving the effective utilization area of ​​the screen and the separation efficiency.

[0033] A solid-liquid separation screen 7 is inclined inside the separation chamber 1, through which the sludge is gravity-screened. The angle between the solid-liquid separation screen 7 and the horizontal plane is set to 15°~45°. This range of inclination angles ensures that the solid material can slide smoothly down the screen surface under gravity, while avoiding the problem of insufficient separation due to excessively large inclination angles, thus achieving effective separation of the solid and liquid phases. Those skilled in the art can set the specific inclination angle of the solid-liquid separation screen 7 according to actual conditions. To prevent solid particles from clogging the solid-liquid separation screen 7, a vibrator is also fixedly installed on the inner wall of the separation chamber 1 in this embodiment. The vibrator is connected to the solid-liquid separation screen 7 and can drive the screen to generate micro-vibration during equipment operation to prevent screen clogging.

[0034] At the bottom of the separation tank 1, a solid outlet 1-3 and a liquid outlet 1-2 are respectively provided, and the solid outlet 1-3 and the liquid outlet 1-2 are respectively located on both sides of the solid-liquid separation screen 7. The solid outlet 1-3 is connected to the solid processing tank 3 through the solid conveying pipe 4, and the liquid outlet 1-2 is connected to the liquid processing tank 2 through the liquid conveying pipe 5. In this embodiment, the liquid conveying pipe 5 is equipped with a valve 6 for controlling the liquid flow rate.

[0035] In the device provided by this invention, the liquid treatment tank 2 is mainly used for further purification of the separated liquid substances. Specifically, the liquid treatment tank 2 is equipped with a filtration mechanism 10 for filtering the liquid substances, which employs multi-stage gradient filtration. In this embodiment, the filtration mechanism 10 includes a coarse filter 10-1, a fine filter 10-2, and an activated carbon filter 10-3 arranged at intervals from top to bottom, with the pore size of the three filter screens decreasing sequentially. The coarse filter 10-1 is used for preliminary filtration of large particulate impurities in the separated liquid, the fine filter 10-2 further removes medium-sized suspended solids, and the activated carbon filter 10-3 removes small particles and dissolved organic matter through adsorption, thereby effectively improving the clarity and water quality of the liquid product. In this embodiment, the pore size of the coarse filter 10-1 is 0.5–2.0 mm, and the pore size of the fine filter 10-2 is 0.1–0.5 mm. Those skilled in the art can select a filter screen with a suitable pore size according to actual working conditions.

[0036] like Figure 3 As shown, the solids processing box 3 serves as the core unit for collecting and discharging solid materials, and it is equipped with a discharge mechanism 8 to assist in the discharge of solid materials. This discharge mechanism 8 includes a drive device 8-1 located outside the solids processing box 3 and a rotating shaft 8-2 horizontally fixed inside the solids processing box 3. One end of the rotating shaft 8-2 passes through the side wall of the box and forms a transmission connection with the output end of the drive device 8-1 to obtain rotational power. Several actuating plates 8-3 are fixed axially on the rotating shaft 8-2. As a preferred arrangement, the actuating plates 8-3 are spirally distributed circumferentially on the rotating shaft 8-2. This spiral layout allows the actuating plates 8-3 to simultaneously exert a dual effect of actuating and pushing on the solid materials during rotation, effectively guiding the materials towards the discharge outlet, preventing material accumulation or bridging within the box, thereby achieving continuous and stable solid discharge.

[0037] Furthermore, considering that sludge or residue may adhere to the surface of the actuating plate 8-3 during long-term operation, this embodiment also includes a rinsing device 11 for cleaning the actuating plate 8-3 inside the solids treatment tank 3. This rinsing device 11 sprays cleaning media towards the actuating plate 8-3 to remove the adhering substances. An external water pump 9 is provided to drive the rinsing device 11, providing stable pressure and flow for the rinsing operation, ensuring cleaning effectiveness, and guaranteeing the long-term stable operation of the discharge mechanism.

[0038] This embodiment also provides a separation method using the above-mentioned solid-liquid separation and discharge device for anaerobic digestion sludge, the specific steps of which are as follows:

[0039] S1: The anaerobic digestion sludge to be treated is conveyed to the separation box 1 through the feed inlet 1-1, and the sludge is separated by gravity on the inclined solid-liquid separation screen 7.

[0040] S2: The liquid material carried in the sludge passes through the solid-liquid separation screen 7 under the action of gravity, flows into the liquid outlet 1-2 and enters the liquid treatment tank 2 through the liquid conveying pipe 5; the liquid entering the liquid treatment tank 2 flows through the filtration mechanism 10, and removes suspended solids and impurities through multi-stage filtration to obtain purified liquid product.

[0041] S3: The solid material trapped above the solid-liquid separation screen 7 in the mud discharge slides down the inclined surface of the screen to the solid outlet 1-3 under the action of gravity, and enters the solid treatment box 3 through the solid conveying pipe 4.

[0042] S4: Start the drive device 8-1. The drive device 8-1 drives the rotating shaft 8-2 and the actuating plate 8-3 to rotate, actuating and pushing the solid material entering the solid processing box 3, and assisting the solid material to be discharged from the solid processing box 3.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A solid-liquid separation and discharge device for anaerobic digestion sludge, characterized in that, The system includes a separation tank (1), a liquid treatment tank (2), and a solid treatment tank (3). The top of the separation tank (1) has an inlet (1-1) for receiving anaerobic digestion sludge, and the bottom has a solid outlet (1-3) and a liquid outlet (1-2). A solid-liquid separation screen (7) is inclinedly arranged inside the separation tank (1), and the solid outlet (1-3) and the liquid outlet (1-2) are respectively located on both sides of the solid-liquid separation screen (7). The solid outlet (1-3) is connected to the solid treatment tank (3) through a solid conveying pipe (4), and the liquid outlet (1-2) is connected to the liquid treatment tank (2) through a liquid conveying pipe (5). The liquid processing tank (2) is provided with a filter mechanism (10) for filtering liquid substances; the solid processing tank (3) is provided with a discharge mechanism (8) for assisting the discharge of solid substances; the discharge mechanism (8) includes a drive device (8-1) located outside the solid processing tank (3) and a rotating shaft (8-2) horizontally fixed inside the solid processing tank (3), the rotating shaft (8-2) and the drive device (8-1) forming a transmission connection; a number of actuating plates (8-3) are fixed on the rotating shaft (8-2).

2. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, The liquid delivery pipe (5) is equipped with a valve (6) for controlling the liquid flow rate.

3. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, The filtration mechanism (10) includes a coarse filter (10-1), a fine filter (10-2), and an activated carbon filter (10-3) arranged at intervals from top to bottom with decreasing pore sizes; wherein the pore size of the coarse filter (10-1) is 0.5 to 2.0 mm, and the pore size of the fine filter (10-2) is 0.1 to 0.5 mm.

4. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, The solids handling box (3) is also equipped with a rinsing device (11) for cleaning the toggle plate (8-3).

5. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 4, characterized in that, The solids treatment box (3) is equipped with a water pump (9) for driving the rinsing equipment (11).

6. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, The actuating plate (8-3) is spirally distributed circumferentially on the rotating shaft (8-2).

7. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, The feed inlet (1-1) is equipped with a feeder for evenly dispersing the anaerobic digestion sludge onto the solid-liquid separation screen (7).

8. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, A vibrator is also fixed on the inner wall of the separation box (1); the vibrator is connected to the solid-liquid separation screen (7) to prevent the screen from clogging.

9. The solid-liquid separation and discharge device for anaerobic digestion sludge according to claim 1, characterized in that, The angle between the solid-liquid separation screen (7) and the horizontal plane is set to 15°~45°.

10. A separation method using the solid-liquid separation and discharge device for anaerobic digestion sludge as described in any one of claims 1 to 9, characterized in that, The specific steps are as follows: S1: The anaerobic digestion sludge to be treated is transported to the separation box (1) through the feed port (1-1), and the sludge is separated by gravity on the inclined solid-liquid separation screen (7); S2: The liquid material carried in the mud passes through the solid-liquid separation screen (7) under the action of gravity, flows into the liquid outlet (1-2) and enters the liquid treatment tank (2) through the liquid conveying pipe (5); the liquid entering the liquid treatment tank (2) flows through the filtration mechanism (10), and removes suspended solids and impurities through multi-stage filtration to obtain purified liquid products; S3: The solid material trapped above the solid-liquid separation screen (7) in the mud flows down the inclined surface of the screen to the solid outlet (1-3) under the action of gravity, and enters the solid processing box (3) through the solid conveying pipe (4). S4: Start the drive device (8-1). The drive device (8-1) drives the rotating shaft (8-2) and the actuating plate (8-3) to rotate, actuating and pushing the solid material entering the solid processing box (3) to assist the solid material to be discharged from the solid processing box (3).

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