Deep emission reduction treatment system based on cooperation of softening and multi-stage filtration and concentration

Abstract

The utility model discloses a deep emission reduction treatment system based on softening and multistage filtration concentration. The deep emission reduction treatment system comprises a high-density sedimentation tank, a filter, a raw water tank and a reverse osmosis device, the high-density sedimentation tank is used for removing silicon from raw water and softening the raw water; the filter is used for filtering the softened raw water; the first reverse osmosis membrane is used for carrying out primary concentration on raw water; the second reverse osmosis membrane is used for secondary concentration. According to the utility model, firstly, raw water is softened through the high-density sedimentation tank, so that hardness impurities possibly influencing subsequent concentration treatment are removed; the softened raw water is filtered through a filter, and suspended matter impurities possibly influencing subsequent concentration treatment are removed; the first reverse osmosis membrane and the second reverse osmosis membrane which are connected in series are used for carrying out primary concentration and secondary concentration on raw water respectively, high-power concentration is improved in a multi-stage reverse osmosis concentration mode, and finally deep emission reduction treatment of multi-stage filtration and concentration is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment systems, and in particular to a deep emission reduction treatment system based on softening and multi-stage filtration and concentration. Background Technology

[0002] Reverse osmosis (RO) membrane separation technology, as a highly efficient water treatment method, has been widely used in the field of industrial wastewater concentration treatment. Traditional single-stage reverse osmosis systems achieve the separation of solute and solvent by applying high pressure to force water molecules to pass through a selectively permeable membrane. However, industrial wastewater often contains various impurities such as high turbidity, high hardness, and high salinity, which is not conducive to subsequent concentration treatment. In addition, when treating industrial wastewater with high salinity, high organic content, or containing special pollutants, single reverse osmosis membrane systems have significant technical bottlenecks: (1) the operating pressure requirement increases exponentially with the increase of feed water concentration, leading to a surge in energy consumption; (2) the concentration polarization phenomenon intensifies, causing the risk of scaling on the membrane surface and resulting in a decrease in permeate flux; (3) the concentration ratio is limited by the maximum withstand pressure of the membrane element, making it difficult to achieve the goal of high concentration.

[0003] Therefore, it is necessary to provide a deep emission reduction treatment system based on softening and synergistic multi-stage filtration and concentration to overcome the above-mentioned defects. Utility Model Content

[0004] The purpose of this invention is to provide a deep emission reduction treatment system based on softening and synergistic multi-stage filtration and concentration, which aims to improve the problem that a single reverse osmosis membrane system is prone to impurities and has poor concentration effect, and to achieve a multi-stage filtration and concentration effect.

[0005] To achieve the above objectives, this utility model provides a deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration, comprising:

[0006] High-density sedimentation tank, which is used for desiliconization and softening of raw water;

[0007] A filter for filtering softened raw water;

[0008] Raw water tank, which is used to receive and store filtered raw water;

[0009] A reverse osmosis device includes a first reverse osmosis membrane and a second reverse osmosis membrane connected in series. The first reverse osmosis membrane is connected to the raw water tank and has a first product water end and a first concentrate water end. The first concentrate water end is used to concentrate the raw water once and send it into the second reverse osmosis membrane. The second reverse osmosis membrane has a second product water end and a second concentrate water end. The second concentrate water end is used to concentrate the raw water after the first concentration and to discharge the resulting concentrate water. The second product water end is used to discharge the product water obtained from the first product water end and the second reverse osmosis membrane.

[0010] In a preferred embodiment, the raw water tank and the reverse osmosis unit are connected by a raw water delivery pipeline, the product water end is connected to a product water discharge pipeline, and the product water discharge pipeline is equipped with a product water control valve; the concentrate end is connected to a concentrate discharge pipeline, and the concentrate discharge pipeline is equipped with a concentrate control valve.

[0011] In a preferred embodiment, the raw water delivery pipeline is equipped with a security filter, which is used to filter impurities in the raw water that exceed the pore size of the filter element.

[0012] In a preferred embodiment, a booster pump is provided between the raw water tank and the security filter, the booster pump being used to pump the raw water in the raw water tank into the security filter; a high-pressure plunger pump is provided between the security filter and the reverse osmosis device, the high-pressure plunger pump being used to pump the raw water filtered by the security filter into the reverse osmosis device.

[0013] In a preferred embodiment, the system further includes a reducing agent dosing component, a scale inhibitor dosing component, and a bactericide dosing component; the reducing agent dosing component is used to add a reducing agent to the raw water delivery pipeline, and the dosing point is located between the booster pump and the security filter; the scale inhibitor dosing component is used to add a scale inhibitor compatible with the reverse osmosis device to the raw water delivery pipeline, and the dosing point is located between the booster pump and the security filter; the bactericide dosing component is used to add a bactericide to the raw water delivery pipeline, and the dosing point is located between the booster pump and the security filter.

[0014] In a preferred embodiment, a product water cleaning pipeline is connected between the raw water tank and the product water discharge pipeline, with the connection point located between the product water end and the product water control valve. The product water cleaning pipeline is equipped with a product water cleaning valve. A concentrated water cleaning pipeline is connected between the raw water tank and the concentrated water discharge pipeline, with the connection point located between the concentrated water end and the concentrated water control valve. The concentrated water cleaning pipeline is equipped with a concentrated water cleaning valve. The product water cleaning pipeline is used to clean the reverse osmosis device from the product water end and discharge the generated cleaning wastewater through the product water discharge pipeline. The concentrated water cleaning pipeline is used to clean the reverse osmosis device from the concentrated water end and discharge the generated cleaning wastewater through the concentrated water discharge pipeline.

[0015] In a preferred embodiment, a concentrate return pipeline is further provided between the concentrate discharge pipeline and the raw water delivery pipeline; the connection point between the concentrate return pipeline and the raw water delivery pipeline is located between the security filter and the high-pressure plunger pump; the concentrate return pipeline is provided with a concentrate return control valve.

[0016] The advanced emission reduction treatment system based on softening and multi-stage filtration and concentration provided by this utility model first removes silica and softens the raw water through a high-density sedimentation tank to remove hardness impurities that may affect subsequent concentration treatment; then, the softened raw water is filtered through a filter to remove suspended impurities that may affect subsequent concentration treatment; finally, the raw water is concentrated in one stage and two stages respectively through a first reverse osmosis membrane and a second reverse osmosis membrane arranged in series, using multi-stage reverse osmosis concentration to achieve high concentration, and finally achieve advanced emission reduction treatment through multi-stage filtration and concentration. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration provided by this utility model.

[0019] The diagram is labeled as follows: 100. Deep emission reduction treatment system based on softening and multi-stage filtration and concentration; 1. High-density sedimentation tank; 10. Filter; 20. Raw water tank; 30. Reverse osmosis unit; 31. First reverse osmosis membrane; 32. Second reverse osmosis membrane; 321. Second product water end; 322. Second concentrate end; 40. Security filter; 50. Booster pump; 60. High-pressure plunger pump; 70. Reducing agent dosing assembly; 80. Scale inhibitor dosing assembly; 90. Bactericide dosing assembly.

[0020] 101. Raw water delivery pipeline; 102. Product water discharge pipeline; 1021. Product water control valve; 103. Concentrate discharge pipeline; 1031. Concentrate control valve; 104. Product water cleaning pipeline; 1041. Product water cleaning valve; 105. Concentrate cleaning pipeline; 1051. Concentrate cleaning valve; 106. Concentrate return pipeline; 1061. Concentrate return control valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the present utility model and are not intended to limit the present utility model.

[0022] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] In an embodiment of this utility model, a deep emission reduction treatment system 100 based on softening synergistic multi-stage filtration and concentration is provided for filtering and concentrating raw wastewater after hardening and silicon removal, thereby obtaining high-concentration saline wastewater and low-concentration permeable water, so as to improve the efficiency of evaporation and crystallization treatment in subsequent processes.

[0025] like Figure 1 As shown, the deep emission reduction treatment system 100 based on softening synergistic multi-stage filtration and concentration includes: a high-density sedimentation tank 1, a filter 10, a raw water tank 20, and a reverse osmosis device 30.

[0026] The high-density sedimentation tank 1 is used for desiliconization and softening of raw water. Specifically, the raw water is first softened in the high-density sedimentation tank 1 to remove hardness impurities that may affect subsequent concentration treatment, such as calcium and magnesium ions that readily react to form precipitates. It should be noted that the steps for desiliconization and hardening of raw water can refer to existing technologies and will not be elaborated here.

[0027] Filter 10 can be a multi-media filter, sand filter, carbon filter, high-efficiency filter, or fiber ball filter, or scraper self-cleaning filter. Its core function is to filter the softened raw water and remove suspended impurities, especially solid particulate impurities, that may affect subsequent concentration treatment.

[0028] Among them, the raw water tank 20 is used to receive and store the filtered raw water.

[0029] The reverse osmosis unit 30 includes a first reverse osmosis membrane 31 and a second reverse osmosis membrane 32 connected in series. That is, the raw water undergoes primary concentration through the first reverse osmosis membrane 31, and then undergoes secondary concentration through the second reverse osmosis membrane 32 to increase the concentration ratio. The first reverse osmosis membrane 31 is connected to the raw water tank 20 and is used to send the raw water to the second reverse osmosis membrane 32 after primary concentration.

[0030] The first reverse osmosis membrane 31 has a first product water end and a first concentrate end. The first concentrate end is used to concentrate the raw water once and send it into the second reverse osmosis membrane 32. The second reverse osmosis membrane 32 has a second product water end 321 and a second concentrate end 322. The second concentrate end 322 is used to further concentrate the raw water after the first concentration and to discharge the highly concentrated concentrate. The first product water end and the second product water end 321 are connected. The second product water end 321 is used to discharge the product water obtained from the first product water end flowing through the second reverse osmosis membrane 32.

[0031] Specifically, the raw water tank 20 and the reverse osmosis unit 30 are connected via a raw water delivery pipeline 101. The second product water end 321 is connected to a product water discharge pipeline 102, which is equipped with a product water control valve 1021. The second concentrate end 322 is connected to a concentrate discharge pipeline 103, which is equipped with a concentrate control valve 1031.

[0032] Furthermore, the raw water delivery pipeline 101 is equipped with a security filter 40. The security filter 40 is used to filter impurities in the raw water passing through the raw water delivery pipeline 101 that exceed the preset size of its own filter element pores.

[0033] Among them, the security filter 40, also known as a precision filter, is a device used for liquid filtration. It mainly uses a filter element as the filter medium and achieves liquid-solid separation through pressure. It mainly performs mechanical filtration through the micropores on the filter element; the common filter element pore size is 5 micrometers, which can effectively intercept suspended particles, colloids, microorganisms and other impurities in the water. Therefore, the security filter 40 is installed at the front end of the reverse osmosis unit 30 to intercept particles larger than 5 micrometers, preventing large particles from scratching or puncturing the reverse osmosis membrane.

[0034] In this embodiment, a booster pump 50 is provided between the raw water tank 20 and the security filter 40. The booster pump 50 is used to pump the raw water in the raw water tank 20 into the security filter 40, and at the same time provide the water pressure required by the security filter 40. A high-pressure plunger pump 60 is provided between the security filter 40 and the reverse osmosis unit 30. The high-pressure plunger pump 60 is used to pump the raw water filtered by the security filter 40 into the reverse osmosis unit 30, and provide the water pressure required by the reverse osmosis unit 30.

[0035] Furthermore, the system also includes a reducing agent dosing component 70, a scale inhibitor dosing component 80, and a bactericide dosing component 90.

[0036] The reducing agent dosing assembly 70 is used to add a reducing agent (e.g., sodium bisulfite) to the raw water delivery pipeline 101, and the dosing point is located between the booster pump 50 and the security filter 40. The reducing agent is used to control the ORP (Oxidation-Reduction Potential) in the raw wastewater to below 200, preventing oxidizing substances in the raw water from corroding the membrane material in the subsequent reverse osmosis unit 30.

[0037] The scale inhibitor dosing component 80 is used to add scale inhibitor compatible with the reverse osmosis unit 30 to the raw water delivery pipeline 101, and the dosing point is located between the booster pump 50 and the security filter 40. The scale inhibitor can be an organic phosphonate scale inhibitor (e.g., hydroxyethylidene diphosphonic acid (HEDP), aminotrimethylene phosphonic acid (ATMP), diethylenetriaminepentamethylidene phosphonic acid (DTPMP), etc.), which prevents scale formation on the membrane surface by forming stable complexes with hardness ions such as calcium and magnesium in the water; or a polycarboxylic acid scale inhibitor (e.g., polyacrylic acid (PAA), polymaleic anhydride (PMA), polyaspartic acid (PASP)), which prevents the deposition of calcium and magnesium ions on the membrane surface through dispersion; or an inorganic phosphate scale inhibitor (e.g., sodium tripolyphosphate (STPP), sodium hexametaphosphate (SHMP)), which prevents scale formation on the membrane surface by forming insoluble phosphates with hardness ions in the water. The solid particles formed by the reaction of the scale inhibitor with ions in the raw water will be filtered by the security filter 40.

[0038] The bactericide dosing assembly 90 is used to add bactericide to the raw water delivery pipeline 101, and the dosing point is located between the booster pump 50 and the security filter 40. The bactericide is used to disinfect microorganisms in the raw water. The bactericide can be any existing product with microbial disinfecting function, and there are no restrictions on its use.

[0039] In this embodiment of the invention, a product water cleaning pipeline 104 is connected between the raw water tank 20 and the product water discharge pipeline 102, with the connection point located between the product water end 321 and the product water control valve 1021. The product water cleaning pipeline 104 is equipped with a product water cleaning valve 1041. The product water cleaning pipeline 104 is used to clean the reverse osmosis unit 30 from the second product water end 321 and discharge the generated cleaning wastewater through the product water discharge pipeline 102. When the reverse osmosis unit 30 is performing concentration treatment, the product water cleaning valve 1041 is closed and the product water control valve 1021 is opened; when it is necessary to clean the second product water end 321, the product water cleaning valve 1041 is opened and the product water control valve 1021 is closed, thereby sending the raw water in the raw water tank 20 into the second product water end 321 for cleaning. After cleaning is completed, the product water cleaning valve 1041 is closed and the product water control valve 1021 is opened so that the cleaning wastewater is discharged through the product water discharge pipeline 102.

[0040] Similarly, a concentrated water cleaning pipeline 105 is connected between the raw water tank 20 and the concentrated water discharge pipeline 103, and the connection point is located between the second concentrated water end 322 and the concentrated water control valve 1031. The concentrated water cleaning pipeline 105 is equipped with a concentrated water cleaning valve 1051. The concentrated water cleaning pipeline 105 is used to clean the reverse osmosis unit 30 from the second concentrated water end 322, and discharges the generated cleaning wastewater through the concentrated water discharge pipeline 103.

[0041] Furthermore, a concentrate return pipeline 106 is provided between the concentrate discharge pipeline 103 and the raw water delivery pipeline 101. The connection between the concentrate return pipeline 106 and the raw water delivery pipeline 101 is located between the security filter 40 and the high-pressure plunger pump 60. The concentrate return pipeline 106 is equipped with a concentrate return control valve 1061. The concentrate return pipeline 106 is used to return the concentrate from the downstream end of the second reverse osmosis membrane 32 to the upstream end of the first reverse osmosis membrane 31, thereby concentrating it again through the reverse osmosis unit 30 to increase the concentration ratio.

[0042] In summary, the deep emission reduction treatment system 100 based on softening and multi-stage filtration and concentration provided by this utility model first softens the raw water through a high-density sedimentation tank to remove hardness impurities that may affect subsequent concentration treatment; then, the softened raw water is filtered through a filter 10 to remove suspended impurities that may affect subsequent concentration treatment; finally, the raw water is concentrated in the first stage and the second stage respectively through a first reverse osmosis membrane 31 and a second reverse osmosis membrane 32 arranged in series, thereby achieving high-concentration through multi-stage reverse osmosis concentration and ultimately realizing deep emission reduction treatment through multi-stage filtration and concentration.

[0043] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.

Claims

1. A deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration, characterized in that, include: High-density sedimentation tank, which is used for desiliconization and softening of raw water; A filter for filtering softened raw water; Raw water tank, which is used to receive and store filtered raw water; A reverse osmosis device includes a first reverse osmosis membrane and a second reverse osmosis membrane connected in series. The first reverse osmosis membrane is connected to the raw water tank and has a first product water end and a first concentrate water end. The first concentrate water end is used to concentrate the raw water once and send it into the second reverse osmosis membrane. The second reverse osmosis membrane has a second product water end and a second concentrate water end. The second concentrate water end is used to concentrate the concentrated raw water a second time and to discharge the resulting concentrate water. The second product water end is used to discharge the product water obtained from the first product water end and the second reverse osmosis membrane.

2. The deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration as described in claim 1, characterized in that, The raw water tank and the reverse osmosis unit are connected by a raw water delivery pipeline. The product water end is connected to a product water discharge pipeline, which is equipped with a product water control valve. The concentrate end is connected to a concentrate discharge pipeline, which is equipped with a concentrate control valve.

3. The deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration as described in claim 2, characterized in that, The raw water delivery pipeline is equipped with a security filter, which is used to filter impurities in the raw water that exceed the pore size of the filter element.

4. The deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration as described in claim 3, characterized in that, A booster pump is provided between the raw water tank and the security filter, and the booster pump is used to pump the raw water in the raw water tank into the security filter; a high-pressure plunger pump is provided between the security filter and the reverse osmosis device, and the high-pressure plunger pump is used to pump the raw water filtered by the security filter into the reverse osmosis device.

5. The deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration as described in claim 4, characterized in that, It also includes a reducing agent dosing component, a scale inhibitor dosing component, and a bactericide dosing component; the reducing agent dosing component is used to add a reducing agent to the raw water delivery pipeline, and the dosing point is located between the booster pump and the security filter; the scale inhibitor dosing component is used to add a scale inhibitor compatible with the reverse osmosis unit to the raw water delivery pipeline, and the dosing point is located between the booster pump and the security filter. ； The bactericide dosing assembly is used to add bactericide to the raw water delivery pipeline, and the dosing point is located between the booster pump and the security filter.

6. The deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration as described in claim 2, characterized in that, A product water cleaning pipeline is connected between the raw water tank and the product water discharge pipeline, with the connection point located between the product water end and the product water control valve. The product water cleaning pipeline is equipped with a product water cleaning valve. A concentrate cleaning pipeline is connected between the raw water tank and the concentrate discharge pipeline, with the connection point located between the concentrate end and the concentrate control valve. The concentrate cleaning pipeline is equipped with a concentrate cleaning valve. The product water cleaning pipeline is used to clean the reverse osmosis unit from the product water end and discharge the generated cleaning wastewater through the product water discharge pipeline. The concentrate cleaning pipeline is used to clean the reverse osmosis unit from the concentrate end and discharge the generated cleaning wastewater through the concentrate discharge pipeline.

7. The deep emission reduction treatment system based on softening synergistic multi-stage filtration and concentration as described in claim 4, characterized in that, A concentrated water return pipeline is also provided between the concentrated water discharge pipeline and the raw water delivery pipeline; the connection between the concentrated water return pipeline and the raw water delivery pipeline is located between the security filter and the high-pressure plunger pump; the concentrated water return pipeline is equipped with a concentrated water return control valve.

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