Graphene production wastewater zero-pollution discharge treatment equipment

Abstract

The invention discloses graphene production wastewater zero-pollution discharge treatment equipment which comprises a graphene production wastewater storage tank, a filter, a concentration membrane system, a reverse osmosis system and a bipolar membrane system, and a liquid outlet of the graphene production wastewater storage tank is communicated with a liquid inlet of the filter through a pipeline; a liquid outlet of the filter is communicated with a liquid inlet of the concentration membrane system through a pipeline, a permeate outlet of the concentration membrane system is communicated with a liquid inlet of the reverse osmosis system through a pipeline, a permeate outlet of the reverse osmosis system outputs pure water, and the permeate outlet of the reverse osmosis system is communicated with the liquid inlet of the concentration membrane system through a pipeline; a concentrated solution outlet of the concentration membrane system is communicated with a liquid inlet of the bipolar membrane system through a pipeline, and two outlets of the bipolar membrane system respectively output a product acid and a product alkali. According to the invention, zero-pollution discharge of wastewater treatment can be realized, and available pure water, acid and alkali products can be produced.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment equipment, and in particular to a zero-pollution discharge treatment equipment for graphene production wastewater. Background Art

[0002] Existing graphene production wastewater is basically transformed into solid hazardous waste through evaporation and crystallization; the main drawback of this method is that evaporation and crystallization consumes a lot of energy and is costly, and the solid hazardous waste formed needs to be treated as hazardous waste, which pollutes the environment and is costly. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a graphene production wastewater zero pollution emission treatment equipment, which can achieve zero pollution emission and produce usable pure water, acid and alkali products.

[0004] To achieve the above object, the present invention is achieved through the following technical solutions: A zero-pollution discharge treatment device for graphene production wastewater comprises a graphene production wastewater storage tank, a filter, a concentration membrane system, a reverse osmosis system and a bipolar membrane system, wherein the liquid outlet of the graphene production wastewater storage tank is connected to the liquid inlet of the filter through a pipeline, the liquid outlet of the filter is connected to the liquid inlet of the concentration membrane system through a pipeline, the permeate outlet of the concentration membrane system is connected to the liquid inlet of the reverse osmosis system through a pipeline, the permeate outlet of the reverse osmosis system outputs pure water, the permeate outlet of the reverse osmosis system is connected to the liquid inlet of the concentration membrane system through a pipeline, the concentrated liquid outlet of the concentration membrane system is connected to the liquid inlet of the bipolar membrane system through a pipeline, and the two outlets of the bipolar membrane system respectively output product acid and product alkali.

[0005] Furthermore, a feed pump is provided on the connecting pipeline between the liquid outlet of the graphene production wastewater storage tank and the liquid inlet of the filter.

[0006] Furthermore, a first buffer tank is provided on the connecting pipeline between the permeate outlet of the concentration membrane system and the liquid inlet of the reverse osmosis system.

[0007] Furthermore, a circulation pump is provided on the connecting pipeline between the permeate outlet of the concentration membrane system and the liquid inlet of the reverse osmosis system.

[0008] Furthermore, a second buffer tank is provided on the connecting pipeline between the concentrated liquid outlet of the concentrated membrane system and the liquid inlet of the bipolar membrane system.

[0009] Furthermore, the filter is a bag filter or a precision filter.

[0010] Furthermore, the concentration membrane system is a roll-type concentration membrane or a butterfly-type concentration membrane, the inlet pressure of the concentration membrane system is 20-80 bar, and the temperature is 25-40°C; the inlet pressure of the reverse osmosis system is 15-25 bar, and the temperature is 25-40°C.

[0011] Furthermore, the membrane of the bipolar membrane system is an ion exchange membrane, the inlet pressure of the bipolar membrane system is 1 to 3 bar, and the temperature is 25 to 40°C.

[0012] The above technical solution has the following advantages or beneficial effects:

[0013] In the graphene production wastewater zero-pollution emission treatment equipment described in the present invention, the graphene production wastewater to be treated is input from the graphene production wastewater storage tank into a filter for filtration pretreatment, and then input into a concentration membrane system to concentrate the filtered wastewater, and the concentrated liquid is treated by the bipolar membrane system to produce product acid and product alkali. At the same time, the permeate of the concentration membrane system is input into a reverse osmosis system for reverse osmosis treatment, and the permeate outlet of the reverse osmosis system can produce pure water for recycling, and the concentrated liquid of the reverse osmosis system circulates back to the concentration membrane system through a pipeline to form a closed loop. Therefore, the graphene production wastewater treatment system can achieve zero pollution emission, and the produced pure water, acid and alkali products can be recycled, achieving the effect of turning waste into treasure of graphene production wastewater, and solving the problem that graphene production wastewater is difficult to treat and easy to pollute the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural block diagram of an embodiment of the present invention.

[0015] Description of labels:

[0016] 1. Graphene production wastewater storage tank, 2. Filter, 3. Concentration membrane system, 4. Reverse osmosis system, 5. Bipolar membrane system, 6. Feed pump, 7. First buffer tank, 8. Circulation pump, 9. Second buffer tank. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] Please refer to the attached Figure 1An embodiment of the present invention provides a graphene production wastewater zero-pollution discharge treatment device, comprising a graphene production wastewater storage tank 1, a filter 2, a concentration membrane system 3, a reverse osmosis system 4 and a bipolar membrane system 5, the liquid outlet of the graphene production wastewater storage tank 1 is connected to the liquid inlet of the filter 2 through a pipeline, the liquid outlet of the filter 2 is connected to the liquid inlet of the concentration membrane system 3 through a pipeline, the permeate outlet of the concentration membrane system 3 is connected to the liquid inlet of the reverse osmosis system 4 through a pipeline, the permeate outlet of the reverse osmosis system 4 outputs pure water, the permeate outlet of the reverse osmosis system 4 is connected to the liquid inlet of the concentration membrane system 3 through a pipeline, the concentrated liquid outlet of the concentration membrane system 3 is connected to the liquid inlet of the bipolar membrane system 5 through a pipeline, and the two outlets of the bipolar membrane system 5 respectively output product acid and product alkali. It can be understood that in this embodiment, the graphene production wastewater to be treated is input from the graphene production wastewater storage tank 1 into the filter 2 for filtration pretreatment, and then input into the concentration membrane system 3 to concentrate the filtered wastewater. The concentrated liquid is treated by the bipolar membrane system 5 to produce product acid (sulfuric acid) and product alkali (sodium hydroxide). At the same time, the permeate of the concentration membrane system 3 is input into the reverse osmosis system 4 for reverse osmosis treatment. The permeate outlet of the reverse osmosis system 4 can produce pure water for recycling, and the concentrated liquid of the reverse osmosis system 4 is circulated back to the concentration membrane system 3 through the pipeline to form a closed loop. Therefore, the graphene production wastewater treatment system can achieve zero pollution discharge, and the pure water, acid and alkali products produced can be recycled, achieving the effect of turning waste into treasure of graphene production wastewater, and solving the problem that graphene production wastewater is difficult to treat and easy to pollute the environment.

[0020] Please refer to the attached Figure 1 In one preferred embodiment, a feed pump 6 is provided on the connecting pipeline between the liquid outlet of the graphene production wastewater storage tank 1 and the liquid inlet of the filter 2. The feed pump 6 is used to pump the wastewater stored in the graphene production wastewater storage tank 1 into the filter 2 for filtration pretreatment. The tank material of the graphene production wastewater storage tank 1 is 316L stainless steel or 304 stainless steel.

[0021] Please refer to the attached Figure 1 In one preferred embodiment, a first buffer tank 7 is provided on the connecting pipeline between the permeate outlet of the concentration membrane system 3 and the liquid inlet of the reverse osmosis system 4. Furthermore, a circulation pump 8 is also provided on the connecting pipeline between the permeate outlet of the concentration membrane system 3 and the liquid inlet of the reverse osmosis system 4. In this embodiment, by providing the first buffer tank 7 on the connecting pipeline between the permeate outlet of the concentration membrane system 3 and the liquid inlet of the reverse osmosis system 4, the first buffer tank 7 is used to temporarily buffer the permeate after the concentration treatment, and then the permeate is pumped into the subsequent reverse osmosis system 4 by the circulation pump 8, so that the permeate of the concentration membrane system 3 can be more stably input into the reverse osmosis system 4 for treatment, thereby improving the stability of wastewater treatment.

[0022] Please refer to the attached Figure 1 In one preferred embodiment, a second buffer tank 9 is provided on the connecting pipeline between the concentrated liquid outlet of the concentrated membrane system 3 and the liquid inlet of the bipolar membrane system 5. The tank material of the first buffer tank 7 and the second buffer tank 9 is PP material or 316L stainless steel material.

[0023] Please refer to the attached Figure 1 In one preferred embodiment, the filter 2 is a bag filter or a precision filter. The filter is made of 316L stainless steel or 304 stainless steel.

[0024] Please refer to the attached Figure 1 In one preferred embodiment, the concentration membrane system 3 is a roll-type concentration membrane or a butterfly-type concentration membrane, and the concentration membrane adopts acid-resistant and sanitary membrane elements. The inlet pressure of the concentration membrane system 3 is 20-80 bar and the temperature is 25-40°C; the inlet pressure of the reverse osmosis system 4 is 15-25 bar and the temperature is 25-40°C, and the reverse osmosis membrane adopts anti-pollution and pollution-resistant reverse osmosis membrane elements.

[0025] Please refer to the attached Figure 1 In one preferred embodiment, the membrane of the bipolar membrane system 5 is an ion exchange membrane, the inlet pressure of the bipolar membrane system 5 is 1 to 3 bar, and the temperature is 25 to 40°C.

[0026] Please refer to the attached Figure 1 In one preferred embodiment, the permeate outlet of the reverse osmosis system 4 is connected to a storage tank for storing pure water, and the two outlets of the bipolar membrane system 5 are respectively connected to a product acid storage tank for storing product acid and a product alkali storage tank for storing product alkali.

[0027] As described above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Claims

1. A graphene production wastewater zero pollution discharge treatment equipment, characterized by: The invention comprises a graphene production wastewater storage tank (1), a filter (2), a concentration membrane system (3), a reverse osmosis system (4) and a bipolar membrane system (5); the liquid outlet of the graphene production wastewater storage tank (1) is connected to the liquid inlet of the filter (2) through a pipeline; the liquid outlet of the filter (2) is connected to the liquid inlet of the concentration membrane system (3) through a pipeline; the permeate outlet of the concentration membrane system (3) is connected to the liquid inlet of the reverse osmosis system (4) through a pipeline; the permeate outlet of the reverse osmosis system (4) outputs pure water; the permeate outlet of the reverse osmosis system (4) is connected to the liquid inlet of the concentration membrane system (3) through a pipeline; the concentrated liquid outlet of the concentration membrane system (3) is connected to the liquid inlet of the bipolar membrane system (5) through a pipeline; and the two outlets of the bipolar membrane system (5) respectively output product acid and product alkali.

2. The graphene production wastewater zero-pollution discharge treatment equipment according to claim 1 is characterized in that: A feed pump (6) is provided on the connecting pipeline between the liquid outlet of the graphene production wastewater storage tank (1) and the liquid inlet of the filter (2).

3. The graphene production wastewater zero-pollution discharge treatment equipment according to claim 1 is characterized in that: A first buffer tank (7) is provided on the connecting pipeline between the permeate outlet of the concentration membrane system (3) and the liquid inlet of the reverse osmosis system (4).

4. The graphene production wastewater zero-pollution discharge treatment equipment according to claim 3 is characterized in that: A circulation pump (8) is also provided on the connecting pipeline between the permeate outlet of the concentration membrane system (3) and the liquid inlet of the reverse osmosis system (4).

5. The graphene production wastewater zero-pollution discharge treatment equipment according to claim 1 is characterized in that: A second buffer tank (9) is provided on the connecting pipeline between the concentrated liquid outlet of the concentrated membrane system (3) and the liquid inlet of the bipolar membrane system (5).

6. The graphene production wastewater zero-pollution discharge treatment equipment according to any one of claims 1 to 5, characterized in that: The filter (2) is a bag filter or a precision filter.

7. The graphene production wastewater zero-pollution discharge treatment equipment according to any one of claims 1 to 5, characterized in that: The concentration membrane system (3) is a roll-type concentration membrane or a butterfly-type concentration membrane. The inlet pressure of the concentration membrane system (3) is 20 to 80 bar and the temperature is 25 to 40° C. The inlet pressure of the reverse osmosis system (4) is 15 to 25 bar and the temperature is 25 to 40° C.

8. The graphene production wastewater zero-pollution discharge treatment equipment according to any one of claims 1 to 5, characterized in that: The membrane of the bipolar membrane system (5) is an ion exchange membrane, the inlet pressure of the bipolar membrane system (5) is 1 to 3 bar, and the temperature is 25 to 40°C.

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