A double drum solid-liquid separation device for treating wastewater

Abstract

The utility model relates to a kind of double-drum solid-liquid separation equipment of wastewater treatment, including upper collecting cylinder and lower collecting cylinder, lower collecting cylinder is located below upper collecting cylinder, power motor is installed in the outside of upper collecting cylinder and lower collecting cylinder, the output end of two power motors is connected with screen drum, screen drum is respectively arranged in upper collecting cylinder and lower collecting cylinder inside, screen drum in upper collecting cylinder is communicated with inlet pipe, the bottom of upper collecting cylinder is communicated with the input end of connecting pipe, the output end of connecting pipe is communicated with the inside of screen drum in lower collecting cylinder, solid collecting bin is installed in the other side of power motor relative to upper collecting cylinder and lower collecting cylinder, solid collecting bin is communicated with the screen drum inside in upper collecting cylinder and lower collecting cylinder, and two cleaning brush rollers are further provided in the inside. In the utility model, by twice solid-liquid separation treatment to wastewater, the solid-liquid separation effect can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a double-drum solid-liquid separation device for treating wastewater. Background Technology

[0002] Livestock and poultry farming wastewater (especially pig farm wastewater) is characterized by high suspended solids (SS), high fiber content, and high organic matter concentration. Solid-liquid separation, as a key step in the treatment of livestock and poultry farming wastewater, aims to separate the solid components in the wastewater to the greatest extent possible, thereby achieving separate treatment of solids and liquids. However, traditional solid-liquid separation equipment generally suffers from technical drawbacks such as poor solid-liquid separation efficiency and easy clogging of screens.

[0003] To address the above problems, a dual-drum solid-liquid separation device for wastewater treatment is proposed. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a double-drum solid-liquid separation device for wastewater treatment, aiming to improve the problems of poor solid-liquid separation effect and easy clogging of screens in existing livestock and poultry manure treatment devices.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-drum solid-liquid separation device for treating wastewater, comprising an upper collection cylinder and a lower collection cylinder, wherein the lower collection cylinder is located below the upper collection cylinder, and a power motor is installed on the outer side of both the upper and lower collection cylinders. The output ends of the two power motors are connected to screen rollers, which are respectively disposed inside the upper and lower collection cylinders. The screen roller in the upper collection cylinder is connected to the liquid inlet pipe, and the bottom of the upper collection cylinder is connected to the input end of a connecting pipe. The output end of the connecting pipe is connected to the interior of the screen roller in the lower collection cylinder. A solid collection chamber is installed on the other side of the upper and lower collection cylinders opposite to the power motors. The solid collection chamber is connected to the screen roller inside the upper and lower collection cylinders. Two cleaning brush rollers are symmetrically arranged inside the upper and lower collection cylinders, respectively located on the outer sides of the screen roller, and the bristles of the cleaning brush rollers abut against the screen roller.

[0006] As a further description of the above technical solution:

[0007] It also includes a backwashing screen system, which includes a backwashing pipe network. The backwashing pipe network is respectively installed on the inner top wall of the upper collection cylinder and the lower collection cylinder, and multiple nozzles are installed on the backwashing pipe network.

[0008] As a further description of the above technical solution:

[0009] It also includes a PLC control device, the output of which is connected to the two backwashing pipe networks through a pipeline to control the backwashing screen system; the PLC control device also controls the motor through wires.

[0010] As a further description of the above technical solution:

[0011] Each cleaning brush roller is equipped with a motor at its end, and a load-bearing plate is provided at the bottom of the motor. The load-bearing plate is fixedly connected to the ends of the upper and lower collection cylinders.

[0012] As a further description of the above technical solution:

[0013] It is also equipped with a screw extruder, the top of which is equipped with a collection hopper, the opening of which is aligned with the bottom of the solid collection bin.

[0014] As a further description of the above technical solution:

[0015] The bottom of the lower collection cylinder is equipped with a drain pipe.

[0016] As a further description of the above technical solution:

[0017] The mesh size of the screen roller in the upper collecting cylinder is smaller than that of the screen roller in the lower collecting cylinder.

[0018] As a further description of the above technical solution:

[0019] Both the top of the upper and lower collection cylinders are rotatably connected with cylinder covers.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, a double-layer screen drum is used to perform solid-liquid separation of wastewater twice, which greatly improves the solid-liquid separation effect; moreover, cleaning brush rollers are provided on both sides of the screen drum to clean the screen regularly, prevent clogging, and further improve the solid-liquid separation effect.

[0022] 2. In this utility model, the backwashing screen system can be set with different flushing intensities and flushing time intervals according to the clogging of the screen, so as to achieve backwashing, efficiently remove screen blockage, and quickly restore the solid-liquid separation function of the screen. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a double-drum solid-liquid separation device for treating wastewater proposed in this utility model;

[0024] Figure 2This is a schematic diagram of the drain pipe of a double-drum solid-liquid separation device for treating wastewater proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the screen drum of a double-drum solid-liquid separation device for treating wastewater, as proposed in this utility model.

[0026] Legend:

[0027] 1. Inlet pipe; 2. Screen drum; 3. Upper collection cylinder; 4. Connecting pipe; 5. Cylinder cover; 6. Solid collection bin; 7. Screw extruder; 8. Collection hopper; 9. Lower collection cylinder; 10. Drain pipe; 11. Backwashing network; 12. Nozzle; 13. Power motor; 14. PLC control device; 15. Motor; 16. Load-bearing plate; 17. Cleaning brush roller. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figure 1 - Figure 3The present invention provides an embodiment of a double-drum solid-liquid separation device for treating wastewater, comprising an upper collection cylinder 3 and a lower collection cylinder 9, which are arranged vertically, with the lower collection cylinder 9 located below the upper collection cylinder 3, and both are securely installed inside the entire equipment frame, effectively utilizing space and facilitating the step-by-step treatment of liquids. Independent motors 13 are installed on the outside of the upper collection cylinder 3 and the lower collection cylinder 9. The output of these two motors 13 drives the two screen rollers 2 to rotate. The screen rollers 2 are designed with a certain inclination angle so that solid fecal residue is gradually pushed to the solid collection bin 6, thereby realizing the solid-liquid separation function in their respective areas. The two screen rollers 2 are respectively set inside the upper collection cylinder 3 and the lower collection cylinder 9. After the two screen rollers 2 rotate, the liquid is thrown out by centrifugal force and collected by the upper collection cylinder 3 and the lower collection cylinder 9. The collected liquid finally gathers at the bottom of the upper collection cylinder 3 and the lower collection cylinder 9. The upper collection cylinder 3 and the lower collection cylinder 9 are designed with a certain inclination angle to facilitate further separation of the collected liquid. The upper collection cylinder 3 and the lower collection cylinder 9 not only serve as an outer shell to protect the normal operation of the screen rollers 2, but also to collect the liquid separated from the screen rollers 2. The screen rollers 2 set inside the upper collection cylinder 3 are connected to the liquid inlet pipe 1. The liquid pipe 1 feeds the wastewater to be treated into the screen roller 2 inside the upper collection cylinder 3 for initial separation. The bottom of the upper collection cylinder 3 is connected to the input end of the connecting pipe 4, and the output end of the connecting pipe 4 is connected to the inside of the screen roller 2 in the lower collection cylinder 9. The liquid after solid-liquid separation in the screen roller 2 inside the upper collection cylinder 3 collects at the bottom of the upper collection cylinder 3 and is fed into the screen roller 2 in the lower collection cylinder 9 through the connecting pipe 4 for a second centrifugal separation. There are two solid collection chambers 6 installed on the other side of the upper collection cylinder 3 and the lower collection cylinder 9 opposite to the power motor 13. They are connected to the screen roller 2 inside the upper collection cylinder 3 and the lower collection cylinder 9, respectively. The solid matter separated in the screen roller 2 is gradually pushed to the solid collection chamber 6 by the continuously rotating roller. It is worth noting that, in order to facilitate equipment maintenance and internal inspection, the top of both the upper collection cylinder 3 and the lower collection cylinder 9 is designed with a rotatable cover 5 for easy observation and operation by the staff.

[0030] The screen of the upper collection cylinder 3's screen roller 2 is made of 304 stainless steel to increase durability and corrosion resistance. The screen mesh size can be selected from 30 to 60 mesh depending on the characteristics of the wastewater. The screen of the lower collection cylinder 9's screen roller 2 is made of replaceable segmented (e.g., 120-150-180 mesh) hydrophilic polymer material (which provides better filtration than stainless steel). It intercepts particles in the wastewater segment by segment according to their size, effectively reducing the risk of screen clogging and maximizing solid-liquid separation. The screen roller 2 is formed by fixing the screen to the roller frame with snap-fit ​​mechanisms, ensuring convenient and quick screen replacement. Driven by the motor 13, the roller rotates, generating centrifugal force to throw the liquid in the wastewater through the screen and retain solids within it, achieving solid-liquid separation in the wastewater.

[0031] Wastewater is first transported through the inlet pipe 1 to the inside of the screen roller 2 in the upper collection cylinder 3. The mesh size of the screen roller 2 in the upper collection cylinder 3 is designed to be smaller than that of the screen roller 2 in the lower collection cylinder 9. This means that the first stage of separation (screen roller 2 in the upper collection cylinder 3) will initially intercept larger solid particles in the wastewater, while the second stage of separation (screen roller 2 in the lower collection cylinder 9) will further intercept smaller solid particles in the wastewater. Driven by the power motor 13, the screen rollers 2 in the upper and lower layers rotate continuously and discharge the intercepted solid matter (such as fecal residue) gradually to the solid collection chamber 6 through the continuously rotating rollers. The liquid after the initial separation will pass through the screen into the upper collection cylinder 3 due to centrifugal force and collect at its bottom.

[0032] The initially separated liquid collected in the upper collection cylinder 3 is not directly discharged. Instead, it is guided through a connecting pipe 4 located at the bottom of the upper collection cylinder 3. The other end of the connecting pipe 4 is cleverly connected to the inside of the screen drum 2 in the lower collection cylinder 9, thus transporting the liquid after the first stage of separation to the second stage separation device—the screen drum 2 in the lower collection cylinder 9—for further processing. The screen drum 2 in the lower collection cylinder 9 has a relatively large mesh size, used to process the liquid containing smaller suspended particles after the first stage of separation, achieving a more thorough solid-liquid separation. The filtrate after separation by the screen drum 2 in the lower collection cylinder 9 finally enters the lower collection cylinder 9. A drain pipe 10 is provided at the bottom of the lower collection cylinder 9 to discharge the filtrate after the two stages of treatment from the equipment, which can be returned to the front end of the wastewater treatment system or discharged directly.

[0033] Solid collection chambers 6 are installed on the opposite side of the upper collection cylinder 3 and the lower collection cylinder 9 relative to the power motor 13. There are two solid collection chambers 6, which are connected to the screen rollers 2 inside the upper collection cylinder 3 and the lower collection cylinder 9. While the screen rollers 2 are performing solid-liquid separation, the solid impurities (such as solid fecal residue) intercepted by the screen rollers 2 are pushed into the solid collection chambers 6 by the rotation of the rollers. The screen rollers 2 are designed with a certain inclination angle so that solid matter (such as fecal residue) is gradually and continuously pushed into the solid collection chambers 6. There are two solid collection chambers 6, one at the end of each of the upper and lower screen rollers 2.

[0034] The machine also includes a screw extruder 7 with a collection hopper 8 at its top. The opening of the collection hopper 8 is aligned with the bottom of the solid collection bin 6. Solid materials (such as manure residue) in the solid collection bin 6 fall into the collection hopper 8 of the screw extruder 7 by gravity, which is used to collect the solid manure residue and further dehydrate it. The screw extruder 7 adopts a segmented screw shaft design. The front section uses a large pitch (200-300mm) to quickly convey materials with high water content. The pitch of the rear section gradually decreases (50-100mm), which can apply increasing pressure to the solid manure residue segment by segment to achieve the desired dehydration effect. This segmented pressurization design can minimize the moisture content of the output material, extruding the solid manure residue into a material with lower moisture content. A discharge port is provided in the screw extrusion section for discharging the dehydrated solid material, which is convenient for subsequent storage or treatment.

[0035] To ensure the long-term, efficient operation of the screen drum 2 without clogging, a backwashing screen system is also provided. This system includes a backwashing pipe network 11, which is installed on the inner top walls of the upper collection cylinder 3 and the lower collection cylinder 9. Multiple nozzles 12 are installed on these backwashing pipe networks 11. This backwashing screen system uses a high-pressure spray pipe network, with nozzle 12 spacing of 30–50 mm and a pressure range of 0.5–1.0 MPa. The nozzles 12 are located on the outer layer of the screen drum 2, and the high-pressure water they generate can thoroughly clean the screen. The wastewater generated during cleaning is collected by the upper and lower collection cylinders.

[0036] In order to ensure thorough cleaning of the screen roller 2, cleaning brush rollers 17 are installed on both sides of its exterior and driven by two motors 15. When the screen roller 2 is rinsed by the backwashing pipe network 11, the cleaning brush rollers 17 rotate in the opposite direction to the screen roller 2 under the drive of the motors 15, which can effectively clean the screen and prevent impurities from clogging the screen holes.

[0037] It also includes a PLC control device 14, which intelligently manages the backwashing screen system. The PLC control device 14 is mounted on the equipment frame, and its output is connected to two backwashing pipe networks 11 via pipelines. This PLC control device can set different flushing intensities and time intervals according to the actual clogging condition of the screen roller 2, thus achieving the backwashing function. Furthermore, the PLC control device 14 controls the motor 15 to work synchronously via electrical wires; when screen clogging is detected, high-pressure water flows through the nozzle 12 to flush the screen, and the cleaning brush roller 17 also reverses synchronously to clean the screen, efficiently removing screen clogging, quickly restoring its solid-liquid separation function, and greatly improving the equipment's operational stability and maintenance convenience.

[0038] Working Principle: This equipment mainly achieves staged solid-liquid separation of wastewater through two-stage series-connected screen drums 2, which is particularly suitable for solid-liquid separation treatment of aquaculture wastewater. First, the wastewater to be treated is transported through the inlet pipe 1 to the screen drum 2 inside the upper collection cylinder 3, where it is driven to rotate by an external power motor 13 for the first stage of solid-liquid separation. During this process, larger solids are intercepted by the screen and pushed into the solid collection chamber 6 connected to the screen drum 2, eventually converging into the bottom collection hopper 8, where it is further dehydrated by a screw extruder 7. The initially separated liquid is then guided from the upper collection cylinder 3 through the connecting pipe 4 to the screen drum 2 inside the lower collection cylinder 9. Driven by another power motor 13, the screen drum 2 in the lower collection cylinder 9 rotates again, performing a second stage of solid-liquid separation on the liquid after the first stage of separation, further filtering out fine suspended solids and smaller particles. Finally, the liquid, purified through both stages, flows into the bottom of the lower collection cylinder 9 and is discharged through the drain pipe 10 at its bottom. To ensure the continuous and efficient operation of the screen, both the upper collection cylinder 3 and the lower collection cylinder 9 are equipped with backwashing pipe networks 11, on which multiple nozzles 12 are installed. Cleaning brush rollers 17 are installed on both sides of the screen drum 2. Under the command of the PLC control device 14, the screen drum 2 can be backwashed and brushed under high pressure to effectively remove screen blockage and maintain the permeability of the screen.

[0039] Solid-liquid separation effect comparison test: To better demonstrate the solid-liquid separation effect of the double-drum solid-liquid separation equipment in this application, the double-drum solid-liquid separation equipment was compared with the two-stage solid-liquid separation (i.e., 40-mesh inclined screen solid-liquid separator + 60-mesh single-layer screen drum solid-liquid separator) commonly used in pig farms. The solid-liquid separation effect of the two solid-liquid separation facilities was evaluated by the removal rates of TS (the mass percentage of solids in wastewater) and COD (chemical oxygen demand) after solid-liquid separation, and the screw extrusion effect of the two solid-liquid separation facilities was evaluated by the moisture content of the manure residue after solid-liquid separation. The test site was a pig farm in Guangdong Province.

[0040] The actual solid-liquid separation results are as follows: After solid-liquid separation, the TS removal rate of the dual-drum solid-liquid separation equipment can reach over 50%, and the COD removal rate can reach over 30%, while the TS removal rate of the two-stage solid-liquid separation facility is around 20%, and the COD removal rate is between 20% and 25%. After solid-liquid separation, the moisture content of the manure residue from the dual-drum solid-liquid separation equipment is ≤75%, while the moisture content of the manure residue from the two-stage solid-liquid separation facility is between 75% and 78%. Therefore, the dual-drum solid-liquid separation equipment in this application has a superior solid-liquid separation effect and a lower discharge moisture content.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-drum solid-liquid separation device for treating wastewater, comprising an upper collection drum (3) and a lower collection drum (9), characterized in that: The lower collecting cylinder (9) is located below the upper collecting cylinder (3). Both the upper collecting cylinder (3) and the lower collecting cylinder (9) are equipped with power motors (13). The output ends of both power motors (13) are connected to screen rollers (2). The screen rollers (2) are respectively located inside the upper collecting cylinder (3) and the lower collecting cylinder (9). The screen roller (2) located in the upper collecting cylinder (3) is connected to the inlet pipe (1). The bottom of the upper collecting cylinder (3) is connected to the input end of the connecting pipe (4). The output end of the connecting pipe (4) is connected to the screen in the lower collecting cylinder (9). The internal structure of the screen roller (2) is interconnected. The upper collection cylinder (3) and the lower collection cylinder (9) are equipped with solid collection chambers (6) on the other side of the power motor (13). The solid collection chambers (6) are connected to the screen rollers (2) inside the upper collection cylinder (3) and the lower collection cylinder (9). The upper collection cylinder (3) and the lower collection cylinder (9) are each symmetrically provided with two cleaning brush rollers (17). The two cleaning brush rollers (17) are located on the outer sides of the screen roller (2), and the bristles of the cleaning brush rollers (17) abut against the screen roller (2).

2. The double-drum solid-liquid separation device for treating wastewater according to claim 1, characterized in that: It also includes a backwashing screen system, which includes a backwashing pipe network (11), which is respectively installed on the inner top wall of the upper collection cylinder (3) and the lower collection cylinder (9), and multiple nozzles (12) are installed on the backwashing pipe network (11).

3. The double-drum solid-liquid separation device for treating wastewater according to claim 2, characterized in that: Each cleaning brush roller (17) is equipped with a motor (15) at its end. The bottom of the motor (15) is provided with a load-bearing plate (16), which is fixedly connected to the ends of the upper collection cylinder (3) and the lower collection cylinder (9).

4. The double-drum solid-liquid separation device for treating wastewater according to claim 3, characterized in that: It also includes a PLC control device (14), the output end of which is connected to the two backwashing pipe networks (11) through a pipe to control the backwashing screen system; the PLC control device (14) also controls the motor (15) through a wire.

5. The double-drum solid-liquid separation device for treating wastewater according to claim 1, characterized in that: It is also equipped with a screw extruder (7), the top of which is provided with a collection hopper (8), the opening of which is aligned with the bottom of the solid collection bin (6).

6. The double-drum solid-liquid separation device for treating wastewater according to claim 1, characterized in that: The bottom of the lower collection cylinder (9) is provided with a drain pipe (10).

7. A double-drum solid-liquid separation device for treating wastewater according to claim 1, characterized in that: The mesh size of the screen roller (2) in the upper collecting cylinder (3) is smaller than that of the screen roller (2) in the lower collecting cylinder (9).

8. A double-drum solid-liquid separation device for treating wastewater according to claim 1, characterized in that: Both the top of the upper collecting cylinder (3) and the lower collecting cylinder (9) are rotatably connected with cylinder covers (5).

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