Device for recovering fibers in water

Abstract

The utility model provides a device for recovering fibers in water, which comprises a sedimentation tank, a filter tank, a clean water tank, a concentration tank, a centrifugal dehydrator and a PLC (programmable logic controller), the upper part of the sedimentation tank is connected to the filter tank through an overflow pipeline, a first mud bucket is arranged at the lower end of the sedimentation tank, a liquid level meter is arranged in the filter tank, and a plurality of flat ceramic membranes are horizontally and laterally arranged in the middle of the filter tank. The flat plate ceramic membrane is connected to the clean water tank through a water producing valve and a water producing pump in sequence, a second mud hopper is arranged at the lower end of the filtering tank, the first mud hopper and the second mud hopper are connected to the concentration tank through a first thick liquid discharging valve and a second thick liquid discharging valve respectively, the bottom of the concentration tank is connected to the centrifugal dehydrator through a third thick liquid discharging valve, and the input end of the PLC is electrically connected with a liquid level meter. The output end of the PLC is electrically connected with the water producing pump, the water producing valve, the first thick liquid discharging valve, the second thick liquid discharging valve and the third thick liquid discharging valve. According to the utility model, the separation and recovery of fibers are realized through physical separation, and the purification of water is also realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the resource recycling technology and water treatment technical field, especially, relate to a water fiber recovery device. BACKGROUND

[0002] In the production or washing process of papermaking, textile and nitrocellulose, a large amount of wastewater containing fibers will be produced. The fibers in water are difficult to be treated by biochemical method, resulting in a large amount of sludge. Moreover, the direct discharge of these fibers also causes great waste of resources. Therefore, it is necessary to recycle the fibers in water. At present, the main methods for recycling fibers in water include: recycling fibers by air flotation, which has low recycling efficiency, such as Chinese invention patent ZL202111402159.2; intercepting fibers by filter medium, which has high requirements for the pore size and pore size distribution of the filter medium, otherwise the clogging of the filter medium is difficult to solve, such as Chinese invention patents 201711417404.0; ZL201911118046.2; ZL202210947986.8; adding flocculants to make fibers flocculate and precipitate; recycling fibers by centrifugal dewatering, which produces fiber products that may have adverse effects on human health and ecological environment due to the addition of flocculants, such as Chinese invention patent application 201910472076.7. SUMMARY

[0003] The utility model solves the problem of negative effects of adding flocculants in the traditional fiber recycling process on the quality of special fibers.

[0004] The utility model provides a water fiber recovery device, including sedimentation tank, filter tank, clear water tank, thickening tank, centrifugal dewatering machine, PLC controller, the upper part of sedimentation tank is connected to filter tank through overflow pipeline, the lower end of sedimentation tank is equipped with first hopper, be equipped with liquid level meter in filter tank, the middle part of filter tank is equipped with a plurality of flat plate ceramic membranes laterally, flat plate ceramic membrane is connected to clear water tank in proper order through water production valve and water production pump, the lower end of filter tank is equipped with second hopper, first hopper and second hopper are connected to thickening tank through first thickening valve and second thickening valve respectively, the bottom of thickening tank is connected to centrifugal dewatering machine through third thickening valve,

[0005] The input end of the PLC controller is electrically connected with the liquid level meter, and the output end of the PLC controller is electrically connected with the water production pump, the water production valve, the first thickening valve, the second thickening valve and the third thickening valve respectively.

[0006] Further, the flat plate ceramic membrane has a pore size of 100-300 mu m, is provided with two layers, and is further connected with a backwashing valve and a backwashing pump in sequence between the flat plate ceramic membrane and the clean water pool, and the backwashing valve and the backwashing pump are electrically connected with the PLC controller output end.

[0007] Further, the filter pool bottom is provided with an aeration pipeline, the aeration pipeline is connected with an aeration fan through an air inlet valve, and the air inlet valve is electrically connected with the PLC controller output end.

[0008] Further, the device further comprises a regulating pool, the concentrated pool upper clear liquid and the centrifugal dewatering machine centrifugal clear liquid are connected to the regulating pool through pipelines respectively, and the regulating pool is connected to the lower part of the sedimentation pool through a pipeline.

[0009] Further, the PLC controller controls the first, second and third concentration discharge valves to be opened for concentration discharge, when the filter pool liquid level reaches the water production pump starting liquid level, the PLC controller controls the water production valve and the water production pump to be opened, when the filter pool liquid level is lower than the low liquid level, the PLC controller controls the water production valve and the water production pump to be closed, and meanwhile, the PLC controller controls the backwashing valve, the backwashing pump and the air inlet valve to be opened to flush the flat plate ceramic membrane.

[0010] Further, the sedimentation pool is an inclined plate sedimentation pool or a vertical plate sedimentation pool.

[0011] Further, the centrifugal dewatering machine is a flat plate type, the rotating speed is 2000-5000 r / min, and the filter cloth mesh number is 6000-10000 meshes.

[0012] Further, the first and second mud buckets have a taper of 45-60°.

[0013] The utility model has the advantages that: the utility model through setting the sedimentation pool in front end, the fiber of larger particle size is under the action of gravity natural settlement, has alleviated the load of rear end filter pool, utilizes the flat plate membrane to carry out the interception to the fiber in water after the deposition, can intercept more than 99.5% fiber through the size effect of membrane hole, realizes the separation of fiber, reaches the purification of water. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model water in the fiber recovery device process flow diagram.

[0015] Figure 2 The utility model water in the fiber recovery device process flow diagram. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of the scheme, the following will be described through specific embodiments, and combined with the drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0017] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it can not be understood as a limitation on the utility model. Embodiments

[0018] As Figure 1 Indicated, a kind of underwater fiber recovery device, including sedimentation tank 12, filter tank 11, clean water tank 14, thickening tank 13, centrifugal dehydrator 15, adjusting tank 16, PLC controller, sedimentation tank 12 is inclined plate sedimentation tank or vertical plate sedimentation tank, the upper portion in sedimentation tank 12 is connected to filter tank 11 via overflow pipe 1, the lower end of sedimentation tank 12 is equipped with first hopper.

[0019] Filter tank 11 is equipped with liquid level meter 2, and a plurality of flat plate ceramic membranes 3 are horizontally and laterally arranged in the middle of filter tank 11, the flat plate ceramic membranes 3 are sequentially connected to clean water tank 14 via water production valve 4 and water production pump 5, the pore size of the flat plate ceramic membranes 3 in the embodiment is 100-300 μm, the flat plate ceramic membranes 3 are provided with two layers, the two layers of flat plate ceramic membranes 3 are controlled separately, and the flat plate ceramic membranes 3 are sequentially connected with backwash valve 6 and backwash pump 7 between the flat plate ceramic membranes 3 and clean water tank 14, the bottom of filter tank 11 is provided with aeration pipe 9, the aeration pipe 9 is connected with aeration fan via air inlet valve 10, the lower end of filter tank 11 is provided with second hopper, and the taper of first hopper and second hopper is 45-60 °. The first hopper and the second hopper are connected to the thickening tank 13 via the first thickening discharge valve 801 and the second thickening discharge valve 802 respectively.

[0020] The bottom of thickening tank 13 is connected to centrifugal dehydrator 15 via third thickening discharge valve 803, centrifugal dehydrator 15 is flat plate type, the rotating speed is 2000-5000 revolutions / minute, and the filter cloth mesh number is 6000-10000 meshes, the supernatant of thickening tank 13 and the centrifugal supernatant of centrifugal dehydrator 15 are connected to adjusting tank 16 via pipes respectively, and adjusting tank 16 is connected to the lower part of sedimentation tank 12 via a pipe.

[0021] The input terminal of the PLC controller is electrically connected to the level gauge 2, and the output terminal of the PLC controller is electrically connected to the inlet pump, the product water valve 4, the first discharge valve 801, the second discharge valve 802, the third discharge valve 803, the backwash valve 6, the backwash pump 7, and the air inlet valve 9 of the sedimentation tank 12.

[0022] Fiber recycling process such as Figure 2 As shown, fiber-containing water is transported to sedimentation tank 12. The PLC controller controls the first concentration valve 801 to discharge the concentrate from the sedimentation tank every 4-5 hours. The upper layer of water in sedimentation tank 12 overflows into filter tank 11. The PLC controller controls the second concentration valve 802 to discharge the concentrate from filter tank 11 every 5 hours. When the liquid level in filter tank 11 reaches the starting level of product water pump 5, the PLC controller controls the product water valve 4 and product water pump 5 to open, discharging the upper layer of clear water in filter tank 11 into clear water tank 14. When the liquid level in filter tank 11 is lower than the low level, the PLC controller controls the product water valve 4 and product water pump 5 to close. At the same time, the PLC controller controls the backwash valve 6, backwash pump 7 and air inlet valve 9 to open, rinsing the flat ceramic membrane 3. The backwash time and aeration time are set by the PLC controller. In this embodiment, the backwash method is to add water and backwash for 1 minute every 30 minutes of aeration. The concentrated liquid discharged from sedimentation tank 12 and filtration tank 11 enters concentration tank 13; concentration time in concentration tank 13 is 30 minutes, and the supernatant from concentration tank 13 is returned to equalization tank 16. The highly concentrated liquid discharged from concentration tank 13 enters centrifugal dewatering machine 15 for dewatering. After centrifugation for 10 minutes, a fiber product with a moisture content of 53.6%-64.5% is obtained, and the centrifuged clear liquid is returned to equalization tank 16. This utility model achieves physical separation of fibers in water without the addition of flocculants, avoiding the impact of chemical agents on the quality of special fiber products.

[0023] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0024] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An in-water fiber recovery apparatus characterized by comprising: The application relates to a plate ceramic membrane filter, which comprises a sedimentation tank, a filter tank, a clean water tank, a concentration tank, a centrifugal dewatering machine and a PLC controller, wherein the upper part of the sedimentation tank is connected to the filter tank through an overflow pipeline, the lower end of the sedimentation tank is provided with a first mud bucket, a liquid level meter is arranged in the filter tank, a plurality of plate ceramic membranes are arranged in the middle part of the filter tank in a horizontal and lateral mode, the plate ceramic membranes are sequentially connected to the clean water tank through a water production valve and a water production pump, the lower end of the filter tank is provided with a second mud bucket, the first mud bucket and the second mud bucket are respectively connected to the concentration tank through a first thick liquid discharge valve and a second thick liquid discharge valve, the bottom of the concentration tank is connected to the centrifugal dewatering machine through a third thick liquid discharge valve, the input end of the PLC controller is electrically connected with the liquid level meter, and the output end of the PLC controller is electrically connected with the water production pump, the water production valve, the first thick liquid discharge valve, the second thick liquid discharge valve and the third thick liquid discharge valve.

2. The in-water fiber recovery apparatus according to claim 1, characterized by, The pore diameter of the plate ceramic membrane is 100-300 mu m, the plate ceramic membrane is provided with two layers, and a backwashing valve and a backwashing pump are further sequentially connected between the plate ceramic membrane and the clean water tank, and the backwashing valve and the backwashing pump are electrically connected with the output end of the PLC controller.

3. The in-water fiber recovery apparatus of claim 1, wherein, The bottom of the filter tank is provided with an aeration pipeline, the aeration pipeline is connected with an aeration fan through an air inlet valve, and the air inlet valve is electrically connected with the output end of the PLC controller.

4. The in-water fiber recovery apparatus of claim 1, wherein, The plate ceramic membrane filter further comprises an adjusting tank, the clear liquid in the upper layer of the concentration tank and the centrifugal clear liquid of the centrifugal dewatering machine are respectively connected to the adjusting tank through pipelines, and the adjusting tank is connected to the lower part of the sedimentation tank through a pipeline.

5. The in-water fiber recovery apparatus according to any one of claims 1 to 3, characterized by The PLC controller controls the first thick liquid discharge valve, the second thick liquid discharge valve and the third thick liquid discharge valve to be opened for thick liquid discharge, when the liquid level in the filter tank reaches the starting liquid level of the water production pump, the PLC controller controls the water production valve and the water production pump to be opened, when the liquid level in the filter tank is lower than a low liquid level, the PLC controller controls the water production valve and the water production pump to be closed, meanwhile, the PLC controller controls the backwashing valve, the backwashing pump and the air inlet valve to be opened, and the plate ceramic membrane is flushed.

6. The in-water fiber recovery apparatus of claim 1, wherein, The sedimentation tank is a inclined plate sedimentation tank or a vertical plate sedimentation tank.

7. The in-water fiber recovery apparatus of claim 1, wherein, The centrifugal dewatering machine is a flat plate type, the rotating speed is 2000-5000 revolutions per minute, and the filter cloth mesh number is 6000-10000 meshes.

8. The in-water fiber recovery apparatus of claim 1, wherein, The taper of the first mud bucket and the second mud bucket is 45-60 degrees.

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