Industrial salt-containing water purification treatment method

Abstract

The invention relates to the technical field of water treatment, in particular to an industrial salt-containing water purification treatment method which comprises the following steps: S1, conveying a water body to be treated to a reservoir for pretreatment, S2, obtaining the particle size and the content of pollutants in the pretreated water body to calculate a pollution characteristic value, and S3, calculating the pollution characteristic value according to the particle size and the content of the pollutants in the pretreated water body. The method comprises the following steps: S1, monitoring the water body after pretreatment, adaptively selecting a preset treatment branch to treat the water body, conveying the pretreated water body to each treatment branch according to a pollution characteristic value, and evaluating a treatment result, and S4, conveying the treated water body to a target area. Damage of pollutants to the membrane in the subsequent membrane separation process is reduced, intelligent treatment of the water body is realized, and the treatment efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a method for purifying and treating industrial salt water. Background Art

[0002] With the accelerated development of industrialization and urbanization, a large amount of industrial wastewater is generated, which may contain various harmful substances, such as heavy metals, organic pollutants, pathogenic microorganisms, various salt ions, etc. In actual situations, membrane treatment technology is often used to treat wastewater. This method is also widely valued and studied because of its effectiveness.

[0003] For example, Chinese patent publication number: CN104437092A discloses a membrane separation device for water treatment, comprising: a hollow fiber curtain membrane assembly having a lower end and a hollow fiber membrane bundle, a base for supporting the lower end, and a water collecting device connected to the water outlet of the hollow fiber curtain membrane assembly; the hollow fiber membrane bundle is arranged vertically, there is a gap between two adjacent hollow fiber curtain membrane assemblies, an air distribution device with air distribution holes is arranged between the gaps, the air distribution device is connected to an aeration device for providing air flow, and the air distribution holes face the root of the hollow fiber membrane bundle near the lower end. The air distribution device is arranged between two adjacent hollow fiber curtain membrane assemblies, the orifice of the air distribution hole faces the root of the hollow fiber membrane bundle, the distance between the orifice and the root of the membrane bundle is short, and there is no obstruction between the two.

[0004] However, the prior art has the following problems: if the water body is not pretreated before membrane separation treatment, large particle pollutants in the water body will block the membrane pores and damage the membrane during the membrane separation process. Summary of the invention

[0005] To this end, the present invention provides a method for purifying industrial salt water to overcome the problem in the prior art that due to the lack of pretreatment of the water body, large particle pollutants in the water body block the membrane pores and damage the membrane during the membrane separation process.

[0006] To achieve the above object, the present invention provides a method for purifying industrial salt water, which comprises:

[0007] Step S1, transporting the water to be treated to a reservoir for pretreatment;

[0008] Step S2, obtaining the particle size and content of pollutants in the pretreated water body to calculate the pollution characteristic value;

[0009] Step S3, transporting the pre-treated water to each treatment branch according to the pollution characteristic value, and evaluating the treatment result, including:

[0010] Determining whether the processing of the third processing branch meets the preset standard according to the separation characteristic coefficient;

[0011] Determining whether the treatment of the second treatment branch meets the preset standard according to the water quality evaluation value;

[0012] Secondarily determining whether the treatment of the second treatment branch meets the preset standard according to the proportion of suspended solids in the middle layer of the water body under the second preset time length;

[0013] Step S4, transporting the treated water to the target area;

[0014] Among them, the first treatment branch is directly connected to the membrane separation module, the second treatment branch includes an aeration tank and an aeration device for aeration, a first sedimentation tank for sedimenting activated sludge, and a water return pump for returning water, and the third treatment branch includes a second sedimentation tank for separating pollutants according to gravity.

[0015] Furthermore, in step S2, the pollutant characteristic value is determined by the particle size and content of the pollutant.

[0016] Furthermore, the transport path of the pretreated water is determined according to the characteristic values ​​of the pollutants, wherein:

[0017] If the pollutant characteristic value is less than the first preset pollutant characteristic value, determining that the conveying path of the pretreated water body is the first processing branch;

[0018] If the pollutant characteristic value is greater than or equal to the first preset pollutant characteristic value and less than the second preset pollutant characteristic value, determining that the conveying path of the pretreated water body is the second processing branch;

[0019] If the pollutant evaluation value is greater than or equal to the second preset pollutant characteristic value, the conveying path of the pretreated water body is determined to be the third processing branch.

[0020] Further, it is determined whether the processing of the third processing branch meets the preset standard according to the separation characteristic coefficient, wherein:

[0021] If the separation characteristic coefficient is less than the preset separation characteristic coefficient, it is determined that the processing of the third processing branch does not meet the preset standard, and the sedimentation time of the pollutants in the second sedimentation tank is increased according to the difference between the preset separation characteristic coefficient and the separation characteristic coefficient;

[0022] If the separation characteristic coefficient is greater than the preset separation characteristic coefficient, it is determined that the treatment of the third treatment branch meets the preset standard, and the water body is transported to the second treatment branch;

[0023] The separation characteristic coefficient is the sedimentation ratio of the pollutants within the first preset time period.

[0024] Furthermore, the adjustment range of the sedimentation time of pollutants in the second sedimentation tank is positively correlated with the difference in separation characteristic coefficients, wherein the difference in separation characteristic coefficients is the difference between the preset separation characteristic coefficient and the separation characteristic coefficient.

[0025] Further, it is determined whether the treatment of the second treatment branch meets the preset standard according to the water quality evaluation value, wherein:

[0026] If the water quality evaluation value is less than the first preset water quality evaluation value, it is determined that the treatment of the second treatment branch meets the preset standard, and the treated water is transported to the membrane separation module;

[0027] If the water quality evaluation value is greater than or equal to the first preset water quality evaluation value and less than the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch does not meet the preset standard, and a second determination is made as to whether the treatment of the second treatment branch meets the preset standard based on the proportion of suspended solids in the middle layer of the water body in the first sedimentation tank under the second preset time length;

[0028] If the water quality evaluation value is greater than or equal to the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch does not meet the preset standard, and the water body is returned to the aeration tank, and the aeration speed is increased according to the difference between the water quality evaluation value and the second preset water quality evaluation value.

[0029] Furthermore, the water quality evaluation value is determined by chemical oxygen demand and biochemical oxygen demand.

[0030] Further, a second determination is made as to whether the treatment of the second treatment branch meets the preset standard according to the proportion of suspended solids in the middle layer of the water body in the first sedimentation tank under the second preset time, wherein:

[0031] If the suspended solids ratio is less than a preset suspended solids ratio threshold, it is determined that the treatment of the second treatment branch meets the preset standard, and the water body is transported to the membrane separation module;

[0032] If the suspended solids ratio is greater than or equal to the preset suspended solids ratio threshold, it is determined that the treatment of the second treatment branch does not meet the preset standard, and the sludge return ratio is reduced according to the difference between the suspended solids ratio and the preset suspended solids ratio threshold.

[0033] Further, the aeration rate is increased according to the water quality evaluation difference, wherein:

[0034] If the water quality evaluation difference is less than a first preset water quality evaluation difference, the aeration speed is increased to a corresponding value using a first speed adjustment coefficient;

[0035] If the water quality evaluation difference is greater than or equal to the first preset water quality evaluation difference and less than the second preset water quality evaluation difference, the aeration speed is increased to a corresponding value using a second speed adjustment coefficient;

[0036] If the water quality evaluation difference is greater than or equal to the second preset water quality evaluation difference, increasing the aeration speed to a corresponding value using a third speed adjustment coefficient;

[0037] The water quality evaluation difference is the difference between the water quality evaluation value and the second preset water quality evaluation value.

[0038] Furthermore, several ratio adjustment methods are provided for reducing the sludge return ratio, and each ratio adjustment method has a different reduction range for the sludge return ratio.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention monitors the pretreated water body, adaptively selects the pre-set treatment branch to treat the water body, reduces the damage of pollutants to the membrane in the subsequent membrane separation process, realizes intelligent water treatment, and improves treatment efficiency.

[0040] Furthermore, the conveying path of the pretreated water body is determined according to the pollutant characteristic value, wherein, if the pollutant characteristic value is less than the first preset pollutant characteristic value, the conveying path of the pretreated water body is determined to be the first treatment branch; if the pollutant characteristic value is greater than or equal to the first preset pollutant characteristic value and less than the second preset pollutant characteristic value, the conveying path of the pretreated water body is determined to be the second treatment branch; if the pollutant evaluation value is greater than or equal to the second preset pollutant characteristic value, the conveying path of the pretreated water body is determined to be the third treatment branch. By setting different treatment paths, the most appropriate treatment strategy can be adopted for water bodies with different degrees of pollution, thereby reducing the cost of water treatment and improving the accuracy of water treatment.

[0041] Furthermore, the introduction of pollutant characteristic values, which are jointly determined by the particle size and content of the pollutants, ensures the accuracy of the transportation path selection.

[0042] Furthermore, it is determined whether the processing of the third processing branch meets the preset standards based on the separation characteristic coefficient, wherein if the separation characteristic coefficient is less than the preset separation characteristic coefficient, it is determined that the processing of the third processing branch does not meet the preset standards, and the sedimentation time of pollutants in the second sedimentation tank is increased according to the difference between the preset separation characteristic coefficient and the separation characteristic coefficient; if the separation characteristic coefficient is greater than the preset separation characteristic coefficient, it is determined that the processing of the third processing branch meets the preset standards, and the water body is transported to the second processing branch. By introducing the separation characteristic coefficient, the eligibility of the water body treatment in the third processing branch can be accurately determined, and different strategies can be implemented for regulation, thereby improving flexibility.

[0043] Furthermore, it is determined whether the treatment of the second treatment branch meets the preset standard based on the water quality evaluation value, wherein if the water quality evaluation value is less than the first preset water quality evaluation value, it is determined that the treatment of the second treatment branch meets the preset standard, and the water body is transported to the membrane separation module; if the water quality evaluation value is greater than or equal to the first preset water quality evaluation value and less than the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch does not meet the preset standard, and a second determination is made whether the treatment of the second treatment branch meets the preset standard based on the proportion of suspended solids in the middle layer of the water body in the first sedimentation tank; if the water quality evaluation value is greater than or equal to the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch does not meet the preset standard, and the water body is returned to the aeration tank, and the aeration speed is increased based on the difference between the water quality evaluation value and the second preset water quality evaluation value. By introducing the water quality evaluation value, the eligibility of the water body treatment of the second treatment branch is accurately determined, thereby improving the flexibility of the treatment.

[0044] Furthermore, the control module determines whether the treatment of the second treatment branch meets the preset standards based on the proportion of suspended solids in the middle layer of the water body in the first sedimentation tank. If the suspended solids proportion is less than the preset suspended solids proportion threshold, the treatment of the second treatment branch is determined to meet the preset standards, and the water body is transported to the membrane separation module; if the suspended solids proportion is greater than or equal to the preset suspended solids proportion threshold, the treatment of the second treatment branch is determined to not meet the preset standards, and the sludge return ratio is reduced according to the difference between the suspended solids proportion and the preset suspended solids proportion threshold. Through the secondary judgment, it is avoided that the water body that does not meet the standards causes burden or damage to the subsequent treatment, thereby improving the overall treatment efficiency.

[0045] Furthermore, the control module is provided with different adjustment modes for increasing the aeration speed according to the water quality evaluation difference, thereby reducing energy consumption by precisely controlling the aeration speed.

[0046] Furthermore, the control module is provided with several proportion adjustment methods for reducing the sludge return ratio, and each proportion adjustment method has a different reduction range for the sludge return ratio, thereby enhancing the accuracy of the adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the steps of a method for purifying industrial salt water according to an embodiment of the present invention;

[0048] Figure 2 A cross-sectional view of a device used in a method for purifying industrial salt water according to an embodiment of the present invention;

[0049] Figure 3 This is a connection diagram of a water transport module according to an embodiment of the present invention;

[0050] Figure 4 This is a flow chart of determining the transport and processing branch of the pre-treated water body according to the characteristic values ​​of the pollutants according to an embodiment of the present invention;

[0051] In the figure: 101, water storage tank; 102, screen; 201, first treatment branch; 202, second treatment branch; 203, third treatment branch; 204, aeration tank; 205, aeration device; 206, first sedimentation tank; 207, sludge return pump; 208, water return pump; 209, second sedimentation tank; 210, middle layer; 301, first detection unit; 302, second detection unit; 401, first image acquisition unit; 402, second image acquisition unit; 501, separation membrane. DETAILED DESCRIPTION

[0052] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0054] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0055] In addition, it should be noted that in the description of the present invention, 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] See also Figures 1 to 4 , Figure 1 This is a schematic diagram of the steps of the industrial salt water purification method according to an embodiment of the present invention. Figure 2 This is a cross-sectional view of a device used in a method for purifying industrial salt water according to an embodiment of the present invention. Figure 3 This is a connection diagram of a water transport module according to an embodiment of the present invention. Figure 4 This is a flow chart of determining the transport and processing routes of pretreated water according to pollutant characteristic values ​​according to an embodiment of the present invention.

[0057] The industrial salt water purification treatment method according to the embodiment of the present invention comprises:

[0058] Step S1, transporting the water to be treated to a reservoir for pretreatment. It is understood that the pretreatment may include filtration, which is achieved through the screen 102;

[0059] Step S2, obtaining the particle size and content of pollutants in the pretreated water body to calculate the pollution characteristic value;

[0060] Step S3, transporting the pre-treated water to each treatment branch according to the pollution characteristic value, and evaluating the treatment result, including:

[0061] Determining whether the processing of the third processing branch meets a preset standard according to the separation characteristic coefficient;

[0062] Determining whether the treatment of the second treatment branch meets the preset standard according to the water quality evaluation value;

[0063] Secondarily determining whether the treatment of the second treatment branch meets the preset standard according to the proportion of suspended solids in the middle layer of the water body under the second preset time length;

[0064] Step S4, transporting the treated water to the target area. It can be understood that each treatment branch leads to the membrane separation module, and the treatment is completed after passing through the membrane separation module;

[0065] Among them, the first treatment branch is directly connected to the membrane separation module, the second treatment branch includes an aeration tank and an aeration device for aeration, a first sedimentation tank for sedimenting activated sludge, and a water return pump for returning water, and the third treatment branch includes a second sedimentation tank for separating pollutants according to gravity.

[0066] Specifically, the transport path of the pretreated water body is determined according to the characteristic values ​​of the pollutants, where:

[0067] If the pollutant characteristic value is less than the first preset pollutant characteristic value 0.52, the conveying path of the pretreated water body is determined to be the first processing branch 201;

[0068] If the pollutant characteristic value is greater than or equal to the first preset pollutant characteristic value and less than the second preset pollutant characteristic value 0.85, then the conveying path of the pretreated water body is determined to be the second processing branch 202;

[0069] If the pollutant evaluation value is greater than or equal to the second preset pollutant characteristic value, the conveying path of the pretreated water body is determined to be the third processing branch 203.

[0070] Specifically, the process of determining the pollutant characteristic value by the particle size and content of the pollutant includes:

[0071] The square root of the ratio of the pollutant particle size to the pollutant particle size threshold is multiplied by the first evaluation coefficient to obtain the pollutant particle size evaluation value, wherein the first evaluation coefficient is 0.55 and the pollutant particle size threshold is 10 μm;

[0072] The ratio of the pollutant content to the pollutant content threshold is squared and multiplied by the second evaluation coefficient to obtain a pollutant content evaluation value, wherein the second evaluation coefficient is 0.42 and the pollutant content threshold is 5%;

[0073] The sum of the pollutant particle size evaluation value and the pollutant content evaluation value is recorded as the pollutant characteristic value.

[0074] Specifically, it is determined whether the processing of the third processing branch 203 meets the preset standard according to the separation characteristic coefficient, wherein:

[0075] If the separation characteristic coefficient is less than 95% of the preset separation characteristic coefficient, it is determined that the treatment of the third treatment branch 203 does not meet the preset standard, and the sedimentation time of the pollutants in the second sedimentation tank 209 is increased according to the difference between the preset separation characteristic coefficient and the separation characteristic coefficient;

[0076] If the separation characteristic coefficient is greater than the preset separation characteristic coefficient, it is determined that the treatment of the third treatment branch 203 meets the preset standard, and the water body is transported to the second treatment branch 202;

[0077] The separation characteristic coefficient is the sedimentation ratio of pollutants within the first preset time period of 1.5 hours.

[0078] Specifically, the preset separation characteristic coefficient is set according to the sedimentation ratio of pollutants within the historical separation treatment time of 5 minutes, but the above value is not limited thereto, and technicians in this field can also adjust the value according to actual needs.

[0079] Specifically, the adjustment range of the sedimentation time of pollutants in the second sedimentation tank 209 is positively correlated with the difference of the separation characteristic coefficient, wherein,

[0080] If the separation characteristic coefficient difference is less than the first preset separation characteristic coefficient difference of 1.7%, the first time adjustment coefficient of 1.02 is used to increase the sedimentation time of the pollutants in the second sedimentation tank 209 to a corresponding value;

[0081] If the separation characteristic coefficient difference is greater than or equal to the first preset separation characteristic coefficient difference and less than 3.5% of the second preset separation characteristic coefficient difference, the second time adjustment coefficient 1.05 is used to increase the sedimentation time of the pollutants in the second sedimentation tank 209 to a corresponding value;

[0082] If the separation characteristic coefficient difference is greater than or equal to the second preset separation characteristic coefficient difference, the third time adjustment coefficient 1.10 is used to increase the sedimentation time of the pollutants in the second sedimentation tank 209 to a corresponding value;

[0083] The separation characteristic coefficient difference is the difference between the preset separation characteristic coefficient and the separation characteristic coefficient.

[0084] Specifically, it is determined whether the treatment of the second treatment branch 202 meets the preset standard according to the water quality evaluation value, wherein:

[0085] If the water quality evaluation value is less than the first preset water quality evaluation value 0.75, it is determined that the treatment of the second treatment branch 202 meets the preset standard, and the treated water is transported to the membrane separation module;

[0086] If the water quality evaluation value is greater than or equal to the first preset water quality evaluation value and less than the second preset water quality evaluation value 0.88, it is determined that the treatment of the second treatment branch 202 does not meet the preset standard, and a second determination is made as to whether the treatment of the second treatment branch 202 meets the preset standard based on the proportion of suspended solids in the middle layer 210 of the water body in the first sedimentation tank 206 under the second preset time length;

[0087] If the water quality evaluation value is greater than or equal to the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch 202 does not meet the preset standard, and the water body is returned to the aeration tank 204, and the aeration speed is increased according to the difference between the water quality evaluation value and the second preset water quality evaluation value.

[0088] Specifically, the process of determining the water quality evaluation value by chemical oxygen demand and biochemical oxygen demand includes:

[0089] The first evaluation coefficient is assigned to the square root of the ratio of the chemical oxygen demand to the chemical oxygen demand threshold to obtain the chemical oxygen demand evaluation value, wherein the first evaluation coefficient is 0.52 and the chemical oxygen demand threshold is 30 mg / L;

[0090] The second evaluation coefficient is assigned to the ratio of the biochemical oxygen demand to the biochemical oxygen demand threshold after square root to obtain the biochemical oxygen demand evaluation value, wherein the second evaluation coefficient is 0.45 and the biochemical oxygen demand threshold is 20 mg / L;

[0091] The chemical oxygen demand evaluation value and the biochemical oxygen demand evaluation value are added together to form the water quality evaluation value.

[0092] Specifically, it is determined whether the treatment of the second treatment branch 202 meets the preset standard based on the proportion of suspended solids in the water middle layer 210 in the first sedimentation tank 206 for the second preset time of 24 hours, wherein:

[0093] If the suspended solids ratio is less than the preset suspended solids ratio threshold of 5%, it is determined that the treatment of the second treatment branch 202 meets the preset standard, and the water body is transported to the membrane separation module;

[0094] If the suspended solids ratio is greater than or equal to the preset suspended solids ratio threshold, it is determined that the treatment of the second treatment branch 202 does not meet the preset standard, and the sludge return ratio is reduced according to the difference between the suspended solids ratio and the preset suspended solids ratio threshold.

[0095] Specifically, the middle layer 210 is from the surface of the sedimentation layer to 2 / 3 of the height of the water body liquid level.

[0096] Specifically, the aeration rate is increased according to the water quality evaluation difference, among which,

[0097] If the water quality evaluation difference is less than the first preset water quality evaluation difference of 0.04, the aeration speed is increased to a corresponding value using the first speed adjustment coefficient of 1.01;

[0098] If the water quality evaluation difference is greater than or equal to the first preset water quality evaluation difference and less than the second preset water quality evaluation difference of 0.10, the aeration speed is increased to a corresponding value using a second speed adjustment coefficient of 1.04;

[0099] If the water quality evaluation difference is greater than or equal to the second preset water quality evaluation difference, the aeration speed is increased to a corresponding value using a third speed adjustment coefficient of 1.08;

[0100] The water quality evaluation difference is the difference between the water quality evaluation value and the second preset water quality evaluation value.

[0101] Specifically, several ratio adjustment methods for reducing the sludge return ratio can be set in the control module, and each ratio adjustment method has a different reduction range for the sludge return ratio, wherein:

[0102] If the suspended solids ratio difference is less than the first preset suspended solids ratio difference of 1.2%, the first ratio adjustment coefficient of 0.98 is used to reduce the sludge return ratio to a corresponding value;

[0103] If the suspended solids ratio difference is greater than or equal to the first preset suspended solids ratio difference and less than 2.5% of the second preset suspended solids ratio difference, the sludge return ratio is reduced to a corresponding value using a second ratio adjustment coefficient of 0.95;

[0104] If the suspended solids ratio difference is greater than or equal to the second preset suspended solids ratio difference, the sludge return ratio is reduced to a corresponding value using a third ratio adjustment coefficient of 0.92;

[0105] The suspended solids ratio difference is a difference between the suspended solids ratio and the preset suspended solids ratio threshold.

[0106] Specifically, this embodiment also provides a device for use in an industrial salt water purification and treatment method, comprising:

[0107] The water pretreatment module includes a water reservoir 101 for storing water and a screen 102 for removing large impurities in the water;

[0108] a water transport module connected to the water pretreatment module, comprising a first treatment branch 201, a second treatment branch 202, and a third treatment branch 203, wherein the second treatment branch 202 comprises an aeration tank 204 and an aeration device 205 for aeration, a first sedimentation tank 206 for sedimenting activated sludge, a sludge return pump 207 for returning sludge, and a water return pump 208 for returning water, and the third treatment branch 203 comprises a second sedimentation tank 209 for separating pollutants according to gravity;

[0109] A detection module, which is connected to the water pretreatment module and the water delivery module respectively, including a first detection unit 301 arranged at the water outlet of the water storage tank 101 for detecting the particle size and content of pollutants in the water body, and a second detection unit 302 arranged at the water outlet of the first sedimentation tank 206 for detecting the chemical oxygen demand and biochemical oxygen demand in the water body after sedimentation in the second treatment branch 202;

[0110] An image acquisition module, which is connected to the water transport module, includes a first image acquisition unit 401 disposed on the inner wall of the first sedimentation tank 206 for acquiring the suspended solids ratio, and a second image acquisition unit 402 disposed on the inner wall of the second sedimentation tank 209 for acquiring the separation characteristic coefficient;

[0111] A membrane separation module, which is connected to the water transport module and includes a separation membrane 501 for separating pollutants;

[0112] A control module, which is respectively connected to the water transport module and the detection module, is used to determine the path of water transport according to the pollutant characteristic values, to determine whether the treatment of the third treatment branch 203 meets the preset standard according to the separation characteristic coefficient, to determine whether the treatment of the second treatment branch 202 meets the preset standard according to the water quality evaluation value, and to secondarily determine whether the treatment of the second treatment branch 202 meets the preset standard according to the proportion of suspended solids in the middle layer 210 of the water body under a second preset time length.

[0113] Specifically, the aeration device 205 is, for example, a jet aerator, which is not specifically limited, and is used for underwater aeration.

[0114] Specifically, the first detection unit 301 includes a water particle detector and a COD meter.

[0115] Specifically, the second detection unit 302 includes a chemical oxygen demand meter and a BOD meter.

[0116] Specifically, the first image acquisition unit 401 and the second image acquisition unit 402 are both cameras with image processing functions, which are not specifically limited and are used to collect water body patterns and obtain the suspended solids ratio and separation characteristic coefficient respectively.

[0117] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for purifying industrial salt water, characterized in that: include: Step S1, transporting the water to be treated to a reservoir for pretreatment; Step S2, obtaining the particle size and content of pollutants in the pretreated water body to calculate the pollution characteristic value; Step S3, transporting the pre-treated water to each treatment branch according to the pollution characteristic value, and evaluating the treatment result, include, Determining whether the processing of the third processing branch meets the preset standard according to the separation characteristic coefficient; Determine whether the treatment of the second treatment branch meets the preset standard according to the water quality evaluation value; Secondarily determining whether the treatment of the second treatment branch meets the preset standard according to the proportion of suspended solids in the middle layer of the water body under the second preset time length; Step S4, transporting the treated water to the target area; Among them, the first treatment branch is directly connected to the membrane separation module, the second treatment branch includes an aeration tank and an aeration device for aeration, a first sedimentation tank for sedimenting activated sludge, and a water return pump for returning water, and the third treatment branch includes a second sedimentation tank for separating pollutants according to gravity.

2. The method for purifying industrial salt water according to claim 1, characterized in that: In the step S2, the pollutant characteristic value is determined by the particle size and content of the pollutant.

3. The industrial salt water purification method according to claim 1, characterized in that: The transport path of the pretreated water is determined according to the characteristic values ​​of the pollutants, where: If the pollutant characteristic value is less than the first preset pollutant characteristic value, determining that the conveying path of the pretreated water body is the first processing branch; If the pollutant characteristic value is greater than or equal to the first preset pollutant characteristic value and less than the second preset pollutant characteristic value, determining that the conveying path of the pretreated water body is the second processing branch; If the pollutant evaluation value is greater than or equal to the second preset pollutant characteristic value, the conveying path of the pretreated water body is determined to be the third processing branch.

4. The method for purifying industrial salt water according to claim 3, characterized in that: According to the separation characteristic coefficient, it is determined whether the processing of the third processing branch meets the preset standard, wherein: If the separation characteristic coefficient is less than the preset separation characteristic coefficient, it is determined that the processing of the third processing branch does not meet the preset standard, and the sedimentation time of the pollutants in the second sedimentation tank is increased according to the difference between the preset separation characteristic coefficient and the separation characteristic coefficient; If the separation characteristic coefficient is greater than the preset separation characteristic coefficient, it is determined that the treatment of the third treatment branch meets the preset standard, and the water body is transported to the second treatment branch; The separation characteristic coefficient is the sedimentation ratio of the pollutants within the first preset time period.

5. The method for purifying industrial salt water according to claim 4, characterized in that: The adjustment range of the sedimentation time of pollutants in the second sedimentation tank is positively correlated with the difference in separation characteristic coefficients, wherein the difference in separation characteristic coefficients is the difference between the preset separation characteristic coefficient and the separation characteristic coefficient.

6. The method for purifying industrial salt water according to claim 5, characterized in that: According to the water quality evaluation value, it is determined whether the processing of the second processing branch meets the preset standard, wherein: If the water quality evaluation value is less than the first preset water quality evaluation value, it is determined that the treatment of the second treatment branch meets the preset standard, and the treated water is transported to the membrane separation module; If the water quality evaluation value is greater than or equal to the first preset water quality evaluation value and less than the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch does not meet the preset standard, and a second determination is made as to whether the treatment of the second treatment branch meets the preset standard based on the proportion of suspended solids in the middle layer of the water body in the first sedimentation tank under the second preset time length; If the water quality evaluation value is greater than or equal to the second preset water quality evaluation value, it is determined that the treatment of the second treatment branch does not meet the preset standard, and the water body is returned to the aeration tank, and the aeration speed is increased according to the difference between the water quality evaluation value and the second preset water quality evaluation value.

7. The method for purifying industrial salt water according to claim 6, characterized in that: The water quality evaluation value is determined by chemical oxygen demand and biochemical oxygen demand.

8. The method for purifying industrial salt water according to claim 7, characterized in that: According to the proportion of suspended solids in the middle layer of the water body in the first sedimentation tank under the second preset time, it is determined whether the treatment of the second treatment branch meets the preset standard, wherein: If the suspended solids ratio is less than a preset suspended solids ratio threshold, it is determined that the treatment of the second treatment branch meets the preset standard, and the water body is transported to the membrane separation module; If the suspended solids ratio is greater than or equal to the preset suspended solids ratio threshold, it is determined that the treatment of the second treatment branch does not meet the preset standard, and the sludge return ratio is reduced according to the difference between the suspended solids ratio and the preset suspended solids ratio threshold.

9. The method for purifying industrial salt water according to claim 8, characterized in that: Increase the aeration rate according to the water quality evaluation difference, among which, If the water quality evaluation difference is less than a first preset water quality evaluation difference, the aeration speed is increased to a corresponding value using a first speed adjustment coefficient; If the water quality evaluation difference is greater than or equal to the first preset water quality evaluation difference and less than the second preset water quality evaluation difference, the aeration speed is increased to a corresponding value using a second speed adjustment coefficient; If the water quality evaluation difference is greater than or equal to the second preset water quality evaluation difference, increasing the aeration speed to a corresponding value using a third speed adjustment coefficient; The water quality evaluation difference is the difference between the water quality evaluation value and the second preset water quality evaluation value.

10. The method for purifying industrial salt water according to claim 9, characterized in that: Several ratio adjustment methods are provided for reducing the sludge return ratio, and each ratio adjustment method has a different reduction range for the sludge return ratio.

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