Composite filtered water treatment system for wet spunlace and working method of composite filtered water treatment system

Abstract

The invention discloses a composite filtered water treatment system for wet spunlace and a working method thereof, and the system comprises an air flotation reaction system, a middle water tank, a sand filter tank filtering system, a micro-nano filtering system and a clean water barrel for production, the air flotation reaction system, the middle water tank, the sand filter tank filtering system, the micro-nano filtering system and the clean water barrel for production are sequentially connected through pipelines; the air flotation reaction system is connected with a production water recovery pipeline, and the middle water tank is connected with a raw water pipeline. According to the composite filtered water treatment system for wet spunlace, the wastewater treatment efficiency is improved, zero discharge of wastewater is achieved, the environmental influence is reduced, water resources are saved, and the production cost is reduced. And meanwhile, the quality of non-woven fabric products is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wet spunlace production, and more specifically, relates to a composite filtering water treatment system for wet spunlace and a working method thereof. Background Art

[0002] The water treatment system is an important part of the production process of spunlace nonwoven materials. Its function is to purify and recycle the wastewater generated during the production process. With the advancement of green production and the increasing requirements for production efficiency and consumption reduction, the demand for more environmentally friendly and efficient water treatment systems is imminent.

[0003] Wet-laid spunlace nonwoven materials use pulp and ultra-short fibers as raw materials. The fibers in the pulp are short, and some of them will flow into the production wastewater system. The traditional production wastewater treatment system uses primary flotation sedimentation, sand filtration, and discharge, which consumes a lot of water. Each ton of product requires 25 to 35 tons of production water. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and to provide a composite filtration water treatment system for wet hydroentanglement and a working method thereof.

[0005] Technical solution: The composite filtration water treatment system for wet hydroentanglement described in the present invention includes a flotation reaction system, an intermediate water tank, a sand filter tank filtration system, a micro-nano filtration system and a production clean water bucket. The flotation reaction system, the intermediate water tank, the sand filter tank filtration system, the micro-nano filtration system and the production clean water bucket are connected in sequence through pipelines; the flotation reaction system is connected to a production water recovery pipeline, and the intermediate water tank is connected to a raw water pipeline.

[0006] In some embodiments, the flotation reaction system includes a plurality of interconnected flotation reaction tanks, and a gas dissolving tank is installed on the flotation reaction tank.

[0007] In some embodiments, a water treatment flotation agent adding device is installed on the flotation reaction system.

[0008] In some embodiments, a water treatment bactericide adding device is installed on the intermediate water tank.

[0009] In some embodiments, the intermediate water tank is connected to the sand filter tank filtration system via a water pipeline, and an intermediate booster pump is provided in the water pipeline.

[0010] In some embodiments, an intermediate booster pump is provided between the sand filter tank filtration system and the micro-nano filtration system; and a high-pressure water pump is provided at the output end of the production water bucket.

[0011] In some embodiments, a backwash pipe is further included, one end of which is connected to the intermediate water tank through a backwash pump, the other end of which is connected to the bottom of the sand filter tank filtration system, and the top of the sand filter tank filtration system is connected to the flotation reaction system through a sand filter tank backwash water recovery pipe.

[0012] In some embodiments, the micro-nanofiltration system comprises a multi-stage micro-nanofiltration device.

[0013] In some embodiments, the production water recovery pipeline collects wastewater generated during the production process and transports it to the treatment system for recovery and reprocessing.

[0014] On the other hand, the present invention also discloses a working method of a composite filtration water treatment system for wet hydroentanglement, comprising:

[0015] Water for flushing nets: It is directly taken from tap water, pressurized by the intermediate booster pump, and then sprayed out from the flushing net nozzle located above the idle section of the inclined net. A water receiving trough is directly installed at the lower end to collect the water for flushing nets and directly flow it into the production water recovery pipeline for reuse;

[0016] Water for spunlace: If recycled water is used, it must first pass through the flotation reaction system, sand filter tank filtration system, micro-nano filtration system, and add bactericides through the water treatment bactericide adding device for sterilization; if raw water newly added to the intermediate water tank is used, it must also pass through the sand filter tank filtration system, micro-nano filtration system, and add bactericides through the water treatment bactericide adding device for sterilization;

[0017] Water for washing plates: tap water is directly taken and sprayed directly from the booster nozzle. A collection tank is set under the washing table. The collected washing water is directly connected to the sand filter tank backwash water recovery pipeline, passes through the flotation reaction system, sand filter tank filtration system, micro-nano filtration system, and is reused after adding bactericides through the water treatment bactericide adding device for sterilization treatment;

[0018] Sand filter tank backwash water: When the filtration system is working, the control valve of the backwash water pipeline is closed, and the control valve of the water pipeline is opened. The water to be filtered passes through the flotation reaction system, the intermediate water tank, the intermediate booster pump, and the water pipeline, and enters the sand filter tank filtration system at a pressure close to or lower than the tap water supply system, that is, 0.2~0.3MPa. Then, it passes through the micro-nano filtration system and is gathered into the production water bucket, and is pumped to the spurt zone by a high-pressure water pump.

[0019] When the sand filter tank filtration system reaches its working limit, it needs to be backwashed. At this time, the control valve of the water supply pipeline is closed, and the control valve of the backwash water pipeline is opened. The water in the intermediate water tank passes through the backwash pump and the backwash water pipeline, and enters the sand filter tank filtration system from the lower end to backwash it at a pressure 2 to 3 times higher than the tap water supply system. The outlet water is injected into the water treatment system through the sand filter tank backwash water recovery pipeline for recycling and reuse.

[0020] Beneficial effects: Wet-process spunlace nonwoven materials use pulp and ultra-short fibers as raw materials. The fibers in the pulp are short, and some of them will flow into the production wastewater system. The traditional production wastewater treatment system uses primary flotation sedimentation, sand filtration, and discharge, which consumes a lot of water. Each ton of product requires 25 to 35 tons of production water.

[0021] By adopting the wet hydroentanglement composite filtration water treatment system of the present invention, production wastewater is subjected to primary flotation sedimentation, sand filtration, deep treatment and sterilization treatment to obtain production water with cleanliness and sanitary indexes meeting the standards, which can be transported back to the pulp preparation unit or directly used for hydroentanglement; sand filtration backwash drainage is subjected to discharge collection, primary flotation sedimentation, sand filtration, deep treatment and sterilization treatment to obtain production water with cleanliness and sanitary indexes meeting the standards, which can be transported back to the pulp preparation unit or directly used for hydroentanglement, thereby forming a fully closed cycle of production water, production water recovery and sand filter tank backwash water recovery, reducing water consumption, and reducing production water consumption per ton of product to 15-20 tons, saving 40% water compared with traditional water treatment systems.

[0022] The composite filtering water treatment system for wet spunlace improves the wastewater treatment efficiency, achieves zero wastewater discharge, reduces environmental impact, saves water resources, reduces production costs, and improves the quality of non-woven products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the structural principle of a water treatment system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "inside" and "outside" are the directions or positional relationships shown, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0028] Example 1

[0029] like Figure 1 As shown, a composite filtration water treatment system for wet hydroentanglement includes a flotation reaction system 4, an intermediate water tank 9, a sand filter tank filtration system 14, a micro-nano filtration system 15 and a production water bucket 16, wherein the flotation reaction system 4, the intermediate water tank 9, the sand filter tank filtration system 14, the micro-nano filtration system 15 and the production water bucket 16 are connected in sequence through pipelines; the flotation reaction system is connected to a production water recovery pipeline 1, and the intermediate water tank 9 is connected to a raw water pipeline 11 (tap water).

[0030] In this embodiment, Figure 1 As shown, the flotation reaction system 4 includes a primary flotation reaction tank 5 and a secondary flotation reaction tank 7 which are interconnected, and a primary dissolved air tank 6 and a secondary dissolved air tank 8 are installed on the primary flotation reaction tank 5 and the secondary flotation reaction tank 7, respectively. Among them, the function of the flotation reaction system 4 is to separate the suspended matter such as fibers, pulp, impurities, etc. in the water by flotation technology. Specifically, the primary flotation reaction tank 5 is the primary stage of flotation, which is mainly responsible for the preliminary separation of suspended matter such as fibers, pulp, impurities, etc. in the water. The function of the secondary flotation reaction tank 7 is to further process the suspended matter such as fibers, pulp, impurities, etc. that cannot be completely separated by the primary flotation reaction tank 5, so as to improve the water treatment efficiency.

[0031] Among them, Figure 1As shown, the flotation reaction system 4 is respectively connected with a production water recovery pipeline 1, a sand filter tank backwash water recovery pipeline 2 and a water treatment flotation agent adding device 3. Among them, the production water recovery pipeline 1 is used to collect the wastewater generated in the production process and transport it to the treatment system for recycling and reuse. The sand filter tank backwash water recovery pipeline 2 is used to collect the wastewater generated in the sand filter tank backwashing process for further treatment and recycling. The water treatment flotation agent adding device 3 is used to add necessary agents in the water treatment process to help remove suspended matter and impurities in the water.

[0032] In this embodiment, Figure 1 As shown, the water inlet end of the intermediate water tank 9 is connected to the secondary flotation reaction tank 7, and the intermediate water tank 9 is connected to a raw water pipeline 11 (tap water), and a water treatment bactericide adding device 10 is also installed on the intermediate water tank 9. The intermediate water tank 9 is used to temporarily store water that has been preliminarily treated by flotation in preparation for subsequent treatment. The function of the water treatment bactericide adding device 10 is to add bactericide to the water to ensure that the treated water quality meets the sanitary standards. The raw water pipeline 11 is a channel for adding tap water to the intermediate water tank 9 as needed.

[0033] In this embodiment, Figure 1 As shown, the water outlet of the intermediate water tank 9 is connected to the sand filter tank filtration system 14, and the water outlet of the intermediate water tank 9 is connected to the sand filter tank filtration system 14 through a water pipeline 13, and an intermediate booster pump 12 is arranged in the water pipeline 13. Among them, the intermediate booster pump 12 is used to pressurize the water in the intermediate water tank to ensure that the water can pass through the subsequent filtering units smoothly. The water pipeline 13 is a channel for conveying the water that has been preliminarily treated by flotation to the sand filter tank filtration system 14. The sand filter tank filtration system 14 is an important device for further removing medium-sized fibers and pulp impurities in the water through the screening, collision, adsorption and other effects of the fine sand in the tank.

[0034] In this embodiment, Figure 1 As shown, the water outlet of the sand filter tank filtration system 14 is connected to the micro-nano filtration system 15, and an intermediate booster pump 12 is also provided between the water outlet of the sand filter tank filtration system 14 and the micro-nano filtration system 15; wherein the micro-nano filtration system 15 is composed of a multi-stage micro-nano filtration device, through which the micro-level filtration of the multi-stage micro-nano filtration device further removes tiny particles and impurities in the water to ensure the purity of the water quality.

[0035] In this embodiment, Figure 1 As shown, the water outlet of the micro-nano filtration system 15 is connected to the production water bucket 16, and the water outlet of the production water bucket 16 is connected to a high-pressure water pump 17. The production water bucket 16 is used to store completely treated water for use in the production process. The high-pressure water pump 17 is used to transport the treated water to the spunlacing machine of the production line to meet production needs.

[0036] In this embodiment, Figure 1 As shown, it also includes a backwash pipe 19, one end of which is connected to the intermediate water tank 9 through a backwash pump 18, and the other end of the backwash pipe 19 is connected to the bottom of the sand filter tank filtration system 14, and the top of the sand filter tank filtration system 14 is connected to the flotation reaction system 4 through a sand filter tank backwash water recovery pipe 2.

[0037] The backwash pump 18 is used to increase the water pressure to 2-3 times to form a reverse flushing water flow when the sand filter tank and the filter system need to be cleaned. The backwash water pipeline 19 is responsible for conveying the water provided by the backwash pump to the sand filter tank system for cleaning and air washing.

[0038] Example 2

[0039] A method for operating a composite filtration water treatment system for wet hydroentanglement, comprising:

[0040] The water used in wet spunlace production mainly includes water for pulping, water for flushing, water for spunlace, water for washing plates, water for backwashing of sand filter tanks, etc. Water for pulping is used to mix pulp and fiber into evenly distributed slurry, accounting for 95%~98% of the slurry. White water in the white water tank should also be added during pulping, and the amount of water at this time accounts for 995‰~998‰ of the mass of the pulping slurry. After the pulping pump is turned on, the inclined screen former runs at the designed speed, the wet paper sheets are formed on the inclined screen, and are brought into the spunlace reinforcement area, while most of the water used to prepare the slurry circulates directly in the pulping and flushing system, and only a small part of the water is brought into the spunlace area by the wet paper sheets.

[0041] The water for flushing the net is used for flushing the inclined net. It can be directly taken from tap water. After being pressurized by the intermediate booster pump 12, it is sprayed out from the net flushing nozzle located above the idle section of the inclined net. A water receiving trough is directly installed at the lower end to collect the water for flushing the net and directly merge it into the production water recovery pipeline 1.

[0042] The water used for hydroentanglement is the water used for fiber reinforcement. Because it needs to pass through the micropores of the water needle plate at high pressure, it needs to maintain high purity. If recycled water is used, it needs to first pass through the flotation reaction system 4, the sand filter tank filtration system 14, and the micro-nano filtration system 15, and add a bactericide through the water treatment bactericide addition device 10 for sterilization treatment; when using raw water newly added to the intermediate water tank, it must also pass through the sand filter tank filtration system 14, the micro-nano filtration system 15, and add a bactericide through the water treatment bactericide addition device 10 for sterilization treatment.

[0043] The water for washing the plate is used for regularly flushing the water needle plate. The tap water can be directly taken and sprayed directly by the booster nozzle. A collection tank is set under the plate washing table. The collected plate washing water is directly connected to the sand filter tank backwash water recovery pipeline 2, passes through the flotation reaction system 4, the sand filter tank filtration system 14, the micro-nano filtration system 15, and is reused after adding the bactericide through the water treatment bactericide adding device 10 for sterilization treatment.

[0044] The backwash water of the sand filter tank is used to backwash the sand filter tank regularly. When the filtration system is working, the control valve of the backwash water pipeline 19 is closed, and the control valve of the water delivery pipeline 13 is opened. The water to be filtered passes through the flotation reaction system 4, the intermediate water tank 9, the intermediate booster pump 12, and the water delivery pipeline 13, and enters the sand filter tank filtration system 14 at a pressure close to or lower than the tap water supply system, that is, 0.2~0.3MPa, and then passes through the micro-nano filtration system 15 to gather into the production water bucket 16, and is pumped to the water spurting area by the high-pressure water pump 17.

[0045] When the sand filter tank filtration system 14 reaches its working limit, it needs to be backwashed. At this time, the control valve of the water supply pipeline 13 is closed, and the control valve of the backwash water pipeline 19 is opened. The water in the intermediate water tank 9 enters the sand filter tank filtration system 14 from the lower end through the backwash pump 18 and the backwash water pipeline 19 at a pressure 2 to 3 times higher than the tap water supply system for backwashing. The outlet water is injected into the composite filtration water treatment system for wet hydroentanglement of the present invention through the sand filter tank backwash water recovery pipeline 2.

[0046] Wet-laid spunlace nonwoven materials use pulp and ultra-short fibers as raw materials. The fibers in the pulp are short, and some of them will flow into the production wastewater system. The traditional production wastewater treatment system uses primary flotation sedimentation, sand filtration, and discharge, which consumes a lot of water. Each ton of product requires 25 to 35 tons of production water.

[0047] The present invention adopts a independently designed wet-process hydroentanglement composite filtration water treatment system. After the production wastewater is subjected to primary flotation sedimentation, sand filtration, deep treatment and sterilization treatment, production water with cleanliness and sanitary indicators that meet the standards is obtained, which can be transported back to the pulp preparation unit or directly used for hydroentanglement; the sand filtration backwash drainage is discharged and collected, subjected to primary flotation sedimentation, sand filtration, deep treatment and sterilization treatment, production water with cleanliness and sanitary indicators that meet the standards is obtained, which can be transported back to the pulp preparation unit or directly used for hydroentanglement, thereby forming a fully closed cycle of production water, production water recovery and sand filter tank backwash water recovery, reducing water consumption. The production water consumption per ton of product is reduced to 15-20 tons, saving 40% water compared with traditional water treatment systems.

[0048] The composite filtering water treatment system for wet spunlace improves the wastewater treatment efficiency, achieves zero wastewater discharge, reduces environmental impact, saves water resources, reduces production costs, and improves the quality of non-woven products.

[0049] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A composite filtration water treatment system for wet spunlace, characterized in that: It includes an air flotation reaction system, an intermediate water tank, a sand filter tank filtration system, a micro-nano filtration system and a clean water barrel for production. The air flotation reaction system, the intermediate water tank, the sand filter tank filtration system, the micro-nano filtration system and the clean water barrel for production are connected in sequence through pipelines; the air flotation reaction system is connected to a production water recovery pipeline, and the intermediate water tank is connected to a raw water pipeline.

2. A composite filtration water treatment system for wet spunlacing according to claim 1, characterized in that: The air flotation reaction system comprises multiple stages of air flotation reaction pools which are interconnected, and an air dissolving tank is installed on the air flotation reaction pools.

3. A composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: The flotation reaction system is equipped with a water treatment flotation agent adding device.

4. A composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: The intermediate water tank is provided with a water treatment bactericide adding device.

5. The composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: The intermediate water tank is communicated with the sand filter tank filtration system through a water delivery pipeline, and an intermediate booster pump is arranged in the water delivery pipeline.

6. A composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: An intermediate booster pump is provided between the sand filter tank filtration system and the micro-nano filtration system; and a high-pressure water pump is provided at the output end of the production clean water bucket.

7. A composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: It also includes a backwash pipe, one end of which is connected to the intermediate water tank through a backwash pump, the other end of which is connected to the bottom of the sand filter tank filtration system, and the top of the sand filter tank filtration system is connected to the flotation reaction system through a sand filter tank backwash water recovery pipe.

8. The composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: The micro-nano filtration system comprises a multi-stage micro-nano filtration device.

9. The composite filtration water treatment system for wet spunlace according to claim 1, characterized in that: The production water recovery pipeline is used to collect waste water generated during the production process and transport it to the treatment system for recovery and reprocessing.

10. A working method of a composite filtration water treatment system for wet hydroentanglement according to any one of claims 1 to 9, characterized in that: Water for flushing nets: It is directly taken from tap water, pressurized by the intermediate booster pump, and then sprayed out from the flushing net nozzle located above the idle section of the inclined net. A water receiving trough is directly installed at the lower end to collect the water for flushing nets and directly flow it into the production water recovery pipeline for reuse; Water for spunlace: If recycled water is used, it must first pass through the flotation reaction system, sand filter tank filtration system, micro-nano filtration system, and be sterilized by adding bactericides through the water treatment bactericide adding device; If the raw water newly added to the intermediate water tank is used, it must also pass through the sand filter tank filtration system, micro-nano filtration system, and add bactericides through the water treatment bactericide adding device for sterilization treatment; Water for washing plates: tap water is directly taken and sprayed directly from the booster nozzle. A collection tank is set under the washing table. The collected washing water is directly connected to the sand filter tank backwash water recovery pipeline, passes through the flotation reaction system, sand filter tank filtration system, micro-nano filtration system, and is reused after adding bactericides through the water treatment bactericide adding device for sterilization treatment; Sand filter tank backwash water: When the filtration system is working, the control valve of the backwash water pipeline is closed, and the control valve of the water pipeline is opened. The water to be filtered passes through the flotation reaction system, the intermediate water tank, the intermediate booster pump, and the water pipeline, and enters the sand filter tank filtration system at a pressure close to or lower than the tap water supply system, that is, 0.2~0.3MPa. Then, it passes through the micro-nano filtration system and is gathered into the production water bucket, and is pumped to the spurt zone by a high-pressure water pump. When the sand filter tank filtration system reaches its working limit, it needs to be backwashed. At this time, the control valve of the water supply pipeline is closed, and the control valve of the backwash water pipeline is opened. The water in the intermediate water tank passes through the backwash pump and the backwash water pipeline, and enters the sand filter tank filtration system from the lower end to backwash it at a pressure 2 to 3 times higher than the tap water supply system. The outlet water is injected into the water treatment system through the sand filter tank backwash water recovery pipeline for recycling and reuse.

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