A device for separating sludge from water in wastewater treatment of lyocell fibers

Abstract

The utility model relates to a kind of lyocell fibre sewage treatment sludge-water separation device, including sedimentation tank, the top in sedimentation tank is sequentially installed from inside to outside with the flow guide cylinder and annular overflow box of the coaxial line setting of sedimentation tank, the bottom surface opening of flow guide cylinder is set, and the top of flow guide cylinder is communicated with mixed liquor inlet pipe, the top surface opening of annular overflow box is set and lower than the top of flow guide cylinder, and annular overflow box is communicated with water outlet pipe on it;The inner bottom surface of sedimentation tank is installed with several convex strips, both ends of each convex strip are fixedly connected with the inner wall of sedimentation tank, and adjacent two convex strips are spaced apart and can form the sludge collecting groove with vertical section V, each sludge collecting groove is communicated with horizontally distributed sludge discharge pipe, the first regulating valve located outside sedimentation tank is installed on sludge discharge pipe, and sludge recovery device is commonly communicated between several sludge discharge pipes;The utility model can make sludge and water in lyocell fibre sewage separate, so as to process lyocell fibre sewage.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a lyocell fiber wastewater treatment sludge-water separation device. Background Technology

[0002] Lyocell fiber is a regenerated cellulose fiber produced by wet spinning using NMMO (also known as N-methylmorpholine-N-oxide) as a solvent.

[0003] Currently, in the process of manufacturing Lyocell fibers, cellulose needs to be dissolved in a high-concentration NMMO aqueous solution to form a spinning solution. Then, the spinning solution is crystallized and precipitated in a low-concentration NMMO aqueous solution to obtain Lyocell fibers. However, since the production of Lyocell fibers generates high-salt, high-chloride, and high-COD production wastewater, it is necessary to treat the production wastewater to achieve compliance with discharge standards.

[0004] Existing treatment methods sometimes involve mixing production wastewater with activated sludge, treating the production wastewater first using the activated sludge process, and then treating the resulting mixture of sludge and wastewater, i.e., lyocell fiber wastewater. However, when treating lyocell fiber wastewater, it is necessary to separate the sludge from the water and then treat the separated water and sludge separately. Therefore, it is necessary to design a sludge-water separation device for treating lyocell fiber wastewater. Utility Model Content

[0005] The purpose of this invention is to provide a lyocell fiber wastewater treatment sludge-water separation device to solve the problems mentioned in the background art.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows:

[0007] A lyocell fiber wastewater treatment sludge-water separation device includes a vertically arranged sedimentation tank with a certain height. The top of the sedimentation tank is equipped with a guide cylinder and an annular overflow box arranged coaxially with the sedimentation tank from the inside to the outside. The bottom surface of the guide cylinder is open and the top of the guide cylinder is connected to a mixed liquid inlet pipe. The top surface of the annular overflow box is open and lower than the top of the guide cylinder, and the annular overflow box is connected to an outlet pipe.

[0008] The sedimentation tank has several horizontally distributed and parallel protruding strips installed on its inner bottom surface. Both ends of each protruding strip are fixedly connected to the inner wall of the sedimentation tank. Adjacent protruding strips are spaced apart and can form a vertical V-shaped sludge collection trough. Each sludge collection trough is connected to a horizontally distributed sludge discharge pipe. Each sludge discharge pipe is equipped with a first regulating valve located outside the sedimentation tank. Several sludge discharge pipes are connected to a sludge recovery device.

[0009] Furthermore, the sludge recovery device includes a sludge inlet pipe, which is connected to several sludge discharge pipes, and the sludge inlet pipe is also connected to a sludge storage tank. A sludge discharge pump is installed on the sludge storage tank and is connected to a sludge recovery pipe through the sludge discharge pump. The end of the sludge recovery pipe away from the sludge storage tank is located outside the sludge storage tank, and a second regulating valve is installed on the sludge recovery pipe.

[0010] Furthermore, a third regulating valve is installed at the end of the sludge inlet pipe near the sludge storage tank.

[0011] Furthermore, a level gauge is installed inside the sludge storage tank, and a flow meter is installed on the sludge recovery pipe.

[0012] Furthermore, a baffle is installed below the guide tube.

[0013] Furthermore, the acute angle between the inclined surface of the sludge collection trough and the bottom surface of the sedimentation tank is greater than 60 degrees.

[0014] Furthermore, each sludge discharge pipe has one end located inside the sedimentation tank and is fixedly connected to the inner wall of the sedimentation tank, and each sludge discharge pipe located inside the sedimentation tank has several sludge discharge ports.

[0015] Furthermore, a spiral staircase is installed on the outer wall of the sedimentation tank from top to bottom.

[0016] Furthermore, a guardrail is installed on the top of the sedimentation tank.

[0017] Furthermore, the guide tube is connected to the sedimentation tank via a connecting rod.

[0018] The beneficial effects of this utility model by adopting the above technical solution are as follows:

[0019] In use, this invention allows lyocell fiber wastewater to flow into a sedimentation tank through a mixed liquor inlet pipe and a guide tube. Heavier sludge in the wastewater settles freely downwards within the sedimentation tank. Simultaneously, as wastewater is continuously injected into the sedimentation tank, the supernatant at the top rises to the position of the annular overflow box and flows into it. Finally, the supernatant is discharged through the outlet pipe into a water purification unit for further treatment. During the settling of heavier sludge, the sedimentation tank's height provides sufficient settling space. Furthermore, the V-shaped sludge collection trough facilitates the discharge of sludge from the bottom of the sedimentation tank to a sludge recovery device for subsequent sludge treatment. In summary, this invention separates sludge from water in lyocell fiber wastewater, facilitating its treatment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 for Figure 1 Side view of the middle part of the device;

[0022] Figure 3 This is one of the structural schematic diagrams of some of the devices of this utility model;

[0023] Figure 4 This is the second schematic diagram of the structure of part of the device of this utility model.

[0024] Reference numerals in the attached drawings: 1. Mixed liquor inlet pipe; 2. Guide tube; 3. Sludge recovery device; 31. Sludge inlet pipe; 32. Sludge storage tank; 33. Sludge discharge pump; 34. Sludge recovery pipe; 35. Second regulating valve; 36. Third regulating valve; 37. Level gauge; 38. Flow meter; 4. Sedimentation tank; 5. Annular overflow box; 6. Outlet pipe; 7. Raised bar; 8. Sludge collection trough; 9. Sludge discharge pipe; 10. First regulating valve; 11. Baffle plate; 12. Spiral ladder; 13. Guardrail; 14. Connecting rod. Detailed Implementation

[0025] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0026] like Figures 1 to 4As shown, this utility model provides a sludge-water separation device for lyocell fiber wastewater treatment, including a vertically arranged sedimentation tank 4 with a certain height. For example, the height of the sedimentation tank 4 can be set to be greater than that of a sedimentation tank with the same diameter in the prior art, so that the sedimentation tank 4 has sufficient effective volume. In addition, the sedimentation tank 4 can be set as a circular sedimentation tank. The top of the sedimentation tank 4 is equipped with a guide cylinder 2 and an annular overflow box 5 arranged coaxially with the sedimentation tank 4 from the inside to the outside. The bottom surface of the guide cylinder 2 is open, and the top of the guide cylinder 2 is connected to a mixed liquor inlet pipe 1. The annular overflow box 5... The top opening of the overflow box 5 is set below the top of the guide tube 2, and the annular overflow box 5 is connected to the outlet pipe 6. Specifically, during use, Lyocell fiber wastewater can flow into the sedimentation tank 4 through the mixed liquid inlet pipe 1 and the guide tube 2. Then, the heavier sludge in the wastewater can settle freely downward in the sedimentation tank 4. At the same time, during the continuous injection of wastewater into the sedimentation tank 4, when the supernatant in the upper layer rises to the position of the annular overflow box 5, it can flow into the annular overflow box 5. Finally, the supernatant can be discharged into the water purification treatment unit in the subsequent process through the outlet pipe 6 for further treatment.

[0027] In addition, several horizontally distributed and parallel protruding strips 7 are installed on the inner bottom surface of the sedimentation tank 4. Both ends of each protruding strip 7 are fixedly connected to the inner wall of the sedimentation tank 4, and adjacent protruding strips 7 are spaced apart to form a vertical V-shaped sludge collection trough 8. That is, the wall of the sludge collection trough 8 is inclined and there is a certain angle between it and the inner bottom surface of the sedimentation tank 4. Each sludge collection trough 8 is connected to a horizontally distributed sludge discharge pipe 9. Specifically, the acute angle between the inclined surface of the sludge collection trough 8 and the inner bottom surface of the sedimentation tank 4 is greater than 60 degrees, so as to facilitate the sludge to slide into the sludge collection trough 8 for collection and reduce the amount of sludge adhering to the wall of the sludge collection trough 8 to prevent caking. The end of each sludge discharge pipe 9 closest to the sedimentation tank 4 is located inside the sedimentation tank 4 and fixedly connected to the inner wall of the sedimentation tank 4. The sedimentation tank 4 has several sludge discharge ports equidistantly distributed along its length on each sludge discharge pipe 9. Each sludge discharge pipe 9 is equipped with a first regulating valve 10 located outside the sedimentation tank 4. The first regulating valve 10 is used to open and close the sludge discharge channel within the sludge discharge pipe 9 and adjust the sludge discharge rate per unit time. Several sludge discharge pipes 9 are connected to a sludge recovery device 3. In use, when the first regulating valve 10 is opened, the sludge at the bottom of the sedimentation tank 4 can be discharged through the sludge discharge pipe 9 into the sludge recovery device 3. Alternatively, the first regulating valves 10 can be electrically operated and connected to a controller. In use, the controller can be used to sequentially open the first regulating valves 10 to facilitate orderly sludge discharge from the sedimentation tank 4.

[0028] Specifically, as the heavier sludge in the wastewater settles downwards, the sedimentation tank 4 has a certain height, providing sufficient settling space for the sludge. Furthermore, by setting a V-shaped sludge collection trough 8, the sludge located at the bottom of the sedimentation tank 4 can be easily discharged through the sludge discharge pipe 9 to the sludge recycling device 3 for subsequent sludge treatment. In general, this invention can separate the sludge from the water in Lyocell fiber wastewater, facilitating the treatment of Lyocell fiber wastewater; at the same time, the separated sludge can also be recycled.

[0029] The specific setup of sludge recovery device 3 is as follows: Figure 1 and Figure 3 As shown, the sludge recovery device 3 includes a sludge inlet pipe 31, which is connected to several sludge discharge pipes 9. The sludge inlet pipe 31 is also connected to a sludge storage tank 32. Specifically, during use, the sludge storage tank 32 can be buried underground so that the connection point between the sludge inlet pipe 31 and the sludge storage tank 32 is lower than the connection point between the sludge discharge pipes 9 and the sludge inlet pipe 31. Thus, when the first regulating valve 10 is opened, the sludge at the bottom of the sedimentation tank 4 can be discharged by gravity through the sludge discharge pipes 9 and sludge inlet pipes 31 to the sludge storage tank 32 for temporary storage. A sludge discharge pump 33 is installed on the sludge storage tank 32 and is connected to a sludge recovery pipe 34. The sludge discharge pump 33 is located... The bottom of the sludge storage tank 32 can be equipped with a sludge discharge pump 33, which can be configured as a submersible pump. The end of the sludge recovery pipe 34 away from the sludge storage tank 32 is located outside the sludge storage tank 32, and a second regulating valve 35 is installed on the sludge recovery pipe 34. Specifically, the second regulating valve 35 is used to open and close the sludge recovery channel in the sludge recovery pipe 34 and can adjust the sludge discharge volume of the sludge recovery pipe 34 per unit time. In use, when the second regulating valve 35 is opened, the sludge in the sludge storage tank 32 can be discharged to the sludge purification treatment unit of the subsequent process through the sludge recovery pipe 34 by starting the sludge discharge pump 33, or the sludge can be discharged and returned to the anoxic tank for recycling.

[0030] Furthermore, such as Figure 1 and Figure 3 As shown, a third regulating valve 36 is installed at one end of the sludge inlet pipe 31 near the sludge storage tank 32. The third regulating valve 36 is used to open and close the sludge inlet channel in the sludge inlet pipe 31 and can adjust the amount of sludge entering the sludge inlet pipe 31 per unit time. In addition, when the sludge storage tank 32 needs to be repaired, the sludge storage tank 32 can be easily isolated from the sedimentation tank 4 by closing the third regulating valve 36.

[0031] Furthermore, such as Figure 1As shown, a level gauge 37 is installed inside the sludge storage tank 32. The level gauge 37 is a pressure-bearing level gauge. A flow meter 38 is installed on the sludge recovery pipe 34. The flow meter 38 is an electromagnetic flow meter. Specifically, the flow meter 38 and the level gauge 37 are electrically connected to a controller. In use, the level gauge 37 can be used to detect the amount of sludge in the sludge storage tank 32, while the flow meter 38 can be used to detect the amount of sludge discharged from the sludge recovery pipe 34 within a unit time. In addition, the second regulating valve 35 and the third regulating valve 36 can be set to be the same as the first regulating valve 10, that is, both can be set as electric regulating valves and electrically connected to the controller. In this way, in use, according to the detection signals fed back to the controller by the flow meter 38 and the level gauge 37, the start and stop of the sludge discharge pump 33 can be controlled, and the opening and closing and flow rate of the first regulating valve 10, the second regulating valve 35 and the third regulating valve 36 can be adjusted to automatically regulate the discharge and discharge of sludge in the sludge storage tank 32.

[0032] Furthermore, such as Figure 2 As shown, a baffle plate 11 is installed below the guide tube 2. Specifically, the baffle plate 11 can be set as an inverted V-shaped plate. In use, when the Lyocell fiber wastewater flowing out of the guide tube 2 flows toward the baffle plate 11, the baffle plate 11 can slow down the speed at which the Lyocell fiber wastewater flows into the sedimentation tank 4. This can prevent the sludge at the bottom of the sedimentation tank 4 from rolling upward due to the excessive impact speed of the Lyocell fiber wastewater.

[0033] Furthermore, such as Figure 1 As shown, a spiral ladder 12 is installed on the outer wall of the sedimentation tank 4 from top to bottom. Specifically, by setting the spiral ladder 12, it is convenient for operators to climb from the bottom of the sedimentation tank 4 to the top of the tank for inspection and maintenance.

[0034] Furthermore, such as Figure 1 and Figure 2 As shown, a guardrail 13 is installed on the top of the sedimentation tank 4. Specifically, the guardrail 13 can be set as two rings, inner and outer, and the two rings of guardrail 13 are distributed at intervals to form a circulation channel. When in use, the guardrail 13 can protect the operator when the operator is in the circulation channel.

[0035] Furthermore, such as Figure 2 and Figure 4 As shown, the guide tube 2 and the sedimentation tank 4 are connected by connecting rods 14. Specifically, there are multiple connecting rods 14, all of which are horizontally arranged. In addition, the multiple connecting rods 14 are distributed from top to bottom along the circumference of the guide tube 2, which can fix the position of the guide tube 2 firmly to ensure the stability of the guide tube 2 in the sedimentation tank 4.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lyocell fiber wastewater treatment sludge-water separation device, comprising a vertically arranged sedimentation tank of a certain height, characterized in that: The top of the sedimentation tank is equipped with a guide cylinder and an annular overflow box arranged coaxially with the sedimentation tank from the inside to the outside. The bottom surface of the guide cylinder is open and the top of the guide cylinder is connected to a mixed liquid inlet pipe. The top surface of the annular overflow box is open and lower than the top of the guide cylinder, and an outlet pipe is connected to the annular overflow box. The sedimentation tank has several horizontally distributed and parallel protruding strips installed on its inner bottom surface. Both ends of each protruding strip are fixedly connected to the inner wall of the sedimentation tank. Adjacent protruding strips are spaced apart and can form a vertical V-shaped sludge collection trough. Each sludge collection trough is connected to a horizontally distributed sludge discharge pipe. Each sludge discharge pipe is equipped with a first regulating valve located outside the sedimentation tank. Several sludge discharge pipes are connected to a sludge recovery device.

2. The sludge-water separation device for wastewater treatment using lyocell fiber according to claim 1, characterized in that: The sludge recovery device includes a sludge inlet pipe, which is connected to several sludge discharge pipes. The sludge inlet pipe is also connected to a sludge storage tank. A sludge discharge pump is installed on the sludge storage tank and is connected to a sludge recovery pipe through the sludge discharge pump. The end of the sludge recovery pipe away from the sludge storage tank is located outside the sludge storage tank, and a second regulating valve is installed on the sludge recovery pipe.

3. The sludge-water separation device for wastewater treatment using lyocell fiber according to claim 2, characterized in that: A third regulating valve is installed at the end of the mud inlet pipe near the mud storage tank.

4. A lyocell fiber wastewater treatment sludge-water separation device according to claim 2 or 3, characterized in that: A level gauge is installed inside the sludge storage tank, and a flow meter is installed on the sludge recovery pipe.

5. A lyocell fiber wastewater treatment sludge-water separation device according to claim 1, characterized in that: A baffle plate is installed below the flow guide tube.

6. The sludge-water separation device for wastewater treatment using lyocell fiber according to claim 1, characterized in that: The acute angle between the inclined surface of the sludge collection trough and the bottom surface of the sedimentation tank is greater than 60 degrees.

7. A lyocell fiber wastewater treatment sludge-water separation device according to claim 1, characterized in that: Each sludge discharge pipe has one end located inside the sedimentation tank and is fixedly connected to the inner wall of the sedimentation tank. Each sludge discharge pipe located inside the sedimentation tank has several sludge discharge ports.

8. A lyocell fiber wastewater treatment sludge-water separation device according to claim 1, characterized in that: A spiral staircase is installed from top to bottom on the outer wall of the sedimentation tank.

9. A lyocell fiber wastewater treatment sludge-water separation device according to claim 1 or 8, characterized in that: The sedimentation tank is equipped with a guardrail on top.

10. A lyocell fiber wastewater treatment sludge-water separation device according to claim 1, characterized in that: The guide tube is connected to the sedimentation tank by a connecting rod.

Images