A cleaning method for effectively removing organic contamination from membranes

Abstract

The invention discloses a cleaning method for effectively removing organic pollution of a membrane, and relates to the technical field of water treatment. The invention establishes a three-dimensional map model and divides and marks regions, collects seawater sample data from different sea areas, calculates and evaluates an organic pollution index Yjw, objectively evaluates the concentration and distribution of organic pollutants in seawater, selects sea areas below a pollution threshold A1 for further treatment and cleaning, and reduces the cost of seawater desalination; introduces biological treatment before chemical pretreatment of seawater, utilizes microorganisms to decompose and degrade organic pollutants, thereby reducing their impact on the membrane system; removes organic pollutants and other impurities on the membrane through cleaning, restores the permeability and treatment efficiency of the membrane, and prolongs the service life of the membrane system; comprehensively analyzes various indicators, evaluates the cleaning effect, and generates different treatment strategies, saving time and cleaning resources, and improving the efficiency and effect of the overall treatment system.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a cleaning method for effectively removing organic pollution of a membrane. Background Art

[0002] Membrane technology is a technology that uses semi-permeable membranes to separate substances. It is widely used in water treatment, food processing, biomedicine, chemical separation and other fields. It has promoted the development and application of modern separation technology and provided important technical support for environmental protection, resource utilization and industrial production.

[0003] At the same time, membrane technology has extensive and important applications in seawater treatment, covering many aspects from seawater desalination, pretreatment to marine aquaculture and pollution control. Through efficient membrane separation technology, it can provide clean and safe freshwater resources, promote the sustainable use of marine resources, and protect the marine ecological environment.

[0004] However, there are still some shortcomings in the current seawater treatment using membrane technology. When treating seawater, due to the complex nature of pollutants, microorganisms and biofilms are easily attached to the surface of the membrane system and are difficult to remove, thus affecting the permeability and long-term stability of the membrane and the filtration effect of seawater. Summary of the invention

[0005] Technical issues solved

[0006] In view of the deficiencies of the prior art, the present invention provides a cleaning method for effectively removing organic contamination from a membrane, thereby solving the problems mentioned in the background art.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented by the following technical scheme: A cleaning method for effectively removing organic contamination from a membrane comprises the following steps:

[0009] Step 1: Collect sea area maps, build a three-dimensional map model, divide the sea area into several areas at equal intervals, and divide and mark the several areas on the three-dimensional map model;

[0010] At the same time, seawater quality data from different sea areas are collected, a seawater sample set is established, and the seawater sample set is analyzed to obtain the organic pollution index Yjw of several areas; if the organic pollution index Yjw exceeds the pollution threshold A1, a first warning instruction is issued; if the seawater organic pollution index Yjw is lower than the pollution threshold A1, it means that the seawater in the current area is suitable for collection, which is convenient for subsequent processing and conversion into drinking water after cleaning, and is marked as a qualified area;

[0011] Step 2: Extract seawater from the qualified area, perform biological pretreatment after production and processing, collect data in the biological pretreatment process, and construct a biological data set; calculate and obtain the biological treatment index Swc based on the biological data set; and preset the biological threshold A2 and the biological treatment index Swc for evaluation. If the biological threshold A 2 If it is less than the biological treatment index Swc, a second instruction is issued and biological pretreatment is performed again;

[0012] Step 3: Chemically pre-treat the seawater in the area with qualified biological treatment index Swc; preliminarily filter the seawater, then add coagulant and flocculant respectively, and finally precipitate to obtain clean water; perform multi-media filtration and fine filtration on the clean water after precipitation, and finally disinfect it; after the chemical pre-treatment of the seawater is completed, it is cleaned to remove organic pollutants in the membrane system;

[0013] Step 4: Stop the operation of the membrane system, drain the water in the membrane system, perform physical and chemical cleaning on the membrane system in sequence, and finally flush the membrane system; after the flushing is completed, collect the cleaning parameters of the membrane system, build a cleaning data set, extract the cleaning data set and calculate to obtain the first cleaning coefficient Qxs1, and evaluate the first cleaning coefficient Qxs1 to generate different solutions; then reconnect the membrane system to the system and gradually resume the operation of the membrane system;

[0014] Step 5: Centrifuge the cleaned seawater; after centrifugation, high-pressure flushing is performed again to remove residual cleaning agents and pollutants on the membrane surface; after flushing, the permeability Tgl, salt interception rate Yfl and organic pollutant content Wrl in the seawater are collected and a second cleaning coefficient Qxs2 is constructed; at the same time, the second cleaning coefficient Qxs2 is evaluated to generate different response strategies.

[0015] Preferably, the seawater areas divided in the three-dimensional model are marked as QY1, QY2, QY3, ... QY n , n represents the number of segmented regions; the seawater sample set includes lower chemical parameters: water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs;

[0016] The pH value of water quality Sz refers to the negative logarithm of the hydrogen ion concentration in the solution, which is used to measure the acidity and alkalinity of water and is obtained by pH test paper testing;

[0017] Dissolved oxygen Rjy refers to oxygen dissolved in water, which is used to decompose organic matter and degrade pollutants, and is measured by electrochemical sensors;

[0018] Salt concentration Ynd refers to the total amount of dissolved salts in the water body. The conductivity is measured by the conductivity method to calculate the salt concentration in seawater.

[0019] The heavy metal content Zjs refers to the content of metal elements with high density and large atomic weight in seawater. The content of specific heavy metal elements in seawater samples is determined by atomic absorption spectroscopy, which utilizes the absorption of light of specific wavelengths.

[0020] Preferably, the water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs of the seawater sample are extracted, and after dimensionless processing, the seawater organic pollution index Yjw is calculated by the following formula:

[0021]

[0022] Wherein, w1, w2, w3 and w4 represent the weight values ​​of water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs respectively, and w1+w2+w3+w4=1, 0≤w1<1, 0≤w2<1, 0≤w3<1, 0≤w4<1, the specific value is adjusted by the user, and B represents the first correction coefficient;

[0023] The following results are generated by evaluating the preset pollution threshold A1 and the seawater organic pollution index Yjw:

[0024] If the preset pollution threshold A1>seawater organic pollution index Yjw, it means that the cost of removing organic pollution from seawater membranes in the current area is low and suitable for cleaning. At this time, the first result is generated and biological treatment is performed;

[0025] If the preset pollution threshold A1 ≤ seawater organic pollution index Yjw, it means that the cost of removing organic pollution from seawater membrane in the current area is high and it is not suitable for cleaning, and the second result is generated at this time.

[0026] Preferably, the biological data set includes: biological density per cubic meter Msw, biological growth rate Szl and species number Wz;

[0027] The biological density per cubic meter Msw refers to the number of organisms in each cubic meter of seawater. Image data is obtained through remote sensing technology, and the density of organisms is detected through image processing and analysis;

[0028] The biological growth rate Szl refers to the weekly growth rate of biological individuals in seawater. It is also obtained by obtaining image data using remote sensing technology and calculating it through image processing and analysis.

[0029] The number of species Wz refers to the number of different types of organisms present in each cubic meter of seawater. The presence and number of species are determined by DNA in seawater samples;

[0030] The biological density per cubic meter Msw, biological growth rate Szl and species number Wz in the biological data set are extracted and dimensionlessly processed to obtain the biological treatment index Swc using the following formula:

[0031]

[0032] Where, Msw i represents the biomass density per cubic meter in the ith area; Szl i represents the biological growth rate of the ith region; Wz i represents the number of species in the ith region; n represents the total number of regions;

[0033] q1, q2 and q3 represent the weight values ​​of biological density Msw per cubic meter, biological growth rate Szl and species quantity Wz respectively, and q1+q2+q3=1, 0≤q1<1, 0≤q2<1, 0≤q3<1, the specific value is adjusted by the user, and C represents the second correction coefficient;

[0034] By evaluating the preset biological threshold A2 and the biological treatment index Swc, the following instructions are generated:

[0035] If the preset biological threshold value A2>biological treatment index Swc, it means that the biological treatment index Swc in the current seawater is qualified, the biological density Msw per cubic meter, the biological growth rate Szl and the number of species Wz are normal, and the first instruction is generated at this time, and pretreatment and cleaning are performed;

[0036] If the preset biological threshold A2≤biological treatment index Swc, it means that the biological treatment index Swc in the current seawater is unqualified, and the biological density Msw, biological growth rate Szl and species number Wz per cubic meter are abnormal. At this time, the second instruction is generated and biological treatment is performed again.

[0037] Preferably, a coarse grid with a pore size of 1-5 mm is installed to remove large particles, seaweed and debris in the seawater to prevent them from entering subsequent treatment equipment; after adding the coagulant in the mixing tank, the flocculant is added and allowed to stand for 20-30 minutes of reaction time to form a stable floc, and the floc is settled by gravity; the precipitated clean water is then filtered through a sand filter for multi-media filtration, and then microfiltered by using a microfiltration membrane with a pore size of 0.1-1 micron.

[0038] Preferably, the membrane system is completely still, the water in the membrane system is drained, and the membrane system is backwashed for 10-15 minutes using a low-pressure reverse water flow of 1.5-2 times the working pressure to remove loose particles and suspended matter on the membrane surface; a chemical cleaning solution is injected into the membrane system and circulated in the membrane system for 30-60 minutes, and finally the membrane system is flushed with pretreated clean water to remove the chemical cleaning solution and decomposed organic pollutants;

[0039] The cleaning data set includes: membrane flux Mtl, inlet and product water quality difference Jccz, backwash flow Fcx and pressure recovery rate Ylh; membrane flux Mtl refers to the volume flow through the membrane in liters per square meter per hour. The total water volume of the membrane is measured by the flow meter installed at the water outlet of the membrane system, and the filtration time and effective filtration area are collected for calculation. The calculation formula is: Where V represents the total water volume of the membrane, Mj represents the effective filtration area of ​​the membrane, and t represents the filtration time;

[0040] The difference between the inlet and product water quality Jccz refers to the difference between the water quality parameters of the inlet and product water. It is obtained by installing a water quality analyzer on the inlet and product water pipelines, collecting and calculating the data. The calculation formula is: Jccz = P in -P out , where P in Expressed as influent water quality parameter, P out Expressed as produced water quality parameters;

[0041] The backwash flow rate Fcx refers to the water flow rate passing through the membrane during the backwash process, which is obtained by installing a flow meter on the backwash pipe and measuring it in real time;

[0042] The pressure recovery rate Ylh refers to the degree to which the operating pressure of the membrane system recovers to its initial state after cleaning. It is calculated by installing pressure sensors at the inlet and outlet of the membrane system and monitoring the operating pressure before and after cleaning in real time. The calculation formula is: P cleaned Expressed as the operating pressure after cleaning, P initial Expressed as initial operating pressure.

[0043] Preferably, the membrane flux Mtl, the inlet and outlet water quality difference Jccz, the backwash flow Fcx and the pressure recovery rate Ylh in the cleaning data set are extracted and dimensionlessly processed, and the first cleaning coefficient Qxs1 is calculated by the following formula:

[0044] Qxs1=e1*Mtl+e2*Jccz-e3*Fcx+e4*Ylh+D

[0045] Wherein, e1, e2, e3 and e4 represent the weight values ​​of membrane flux Mtl, inlet and product water quality difference Jccz, backwash flow Fcx and pressure recovery rate Ylh, and e1+e2+e3+e4=1, 0≤e1<1, 0≤e2<1, 0≤e3<1, 0≤e4<1, the specific value is adjusted by the user, and D represents the third correction coefficient;

[0046] By comparing the preset processing threshold A3 and the first cleaning coefficient Qxs1, the following solution is generated:

[0047] If the processing threshold value A3> the first cleaning coefficient Qxs1, it means that the current membrane system cleaning effect is qualified, and centrifugal separation is performed at this time to generate the first solution;

[0048] If the processing threshold value A3 ≤ the first cleaning coefficient Qxs1, it means that the current membrane system cleaning effect is unsatisfactory. In this case, a secondary cleaning is performed to generate a second solution.

[0049] Preferably, the transmittance Tgl refers to the degree of light transmission through the water body, reflecting the transparency and cleanliness of the water body, and is obtained by measuring the degree of light transmission through the water sample through a transmittance measuring instrument;

[0050] The salt interception rate Yfl refers to the efficiency of removing salt during seawater treatment, reflecting the degree of reduction in the salinity of desalinated water. The conductivity of the water sample before and after treatment is measured by a conductivity instrument, and the salt interception rate is calculated based on the change in conductivity. The specific formula is: Among them, σ t is the conductivity of the water sample after treatment, σ0 is the conductivity of the water sample before treatment;

[0051] The organic pollutant content Wrl refers to the concentration of organic pollutants in seawater, including organic dissolved matter and suspended particles. It reflects the degree of pollution and the treatment effect of the water body and is obtained by analyzing seawater samples with a mass spectrometer.

[0052] Preferably, after the permeability Tgl, the salt interception rate Yfl and the organic pollutant content Wrl are dimensionlessly processed, the second cleaning coefficient Qxs2 is calculated by the following formula:

[0053]

[0054] Wherein, t represents the time range, Tgl(t), Yfl(t) and Wrl(t) represent the variation curves of permeability Tgl, salt interception rate Yfl and organic pollutant content Wrl with time t, respectively.

[0055] Preferably, the first cleaning threshold C and the second cleaning threshold D are preset to be compared with the second cleaning coefficient Qxs2, and the first cleaning threshold C> the second cleaning threshold D, and the following response strategy is generated:

[0056] If the second cleaning coefficient Qxs2> the first cleaning threshold C, it means that the current seawater cleaning quality is unqualified and seawater circulation cleaning is required. At this time, the first strategy is generated;

[0057] If the first cleaning threshold C> the second cleaning coefficient Qxs2≥ the second cleaning threshold D, it means that the current seawater cleaning is unqualified, and the seawater is cleaned again using ultrasonic cleaning technology, and the second strategy is generated at this time;

[0058] If the second cleaning threshold D> the second cleaning coefficient Qxs2, it means that the current seawater cleaning quality is qualified and can be put into use. At this time, the third strategy is generated.

[0059] Beneficial Effects

[0060] The present invention provides a cleaning method for effectively removing organic contamination from membranes. It has the following beneficial effects:

[0061] (1) This is a cleaning method for effectively removing organic contamination from membranes. By establishing a three-dimensional map model and dividing and marking the regions, seawater sample data from different sea areas are collected, which helps to identify and locate the degree of pollution in different areas and facilitates subsequent seawater collection and treatment; the organic pollution index Yjw is calculated and evaluated, the concentration and distribution of organic pollutants in seawater are objectively evaluated, and sea areas below the pollution threshold A1 are selected for further treatment and cleaning, thereby reducing the cost of seawater desalination. At the same time, it is determined which areas of seawater are suitable for collection and conversion into drinking water, which helps to ensure the safety and reliability of drinking water; biological treatment is introduced before the chemical pretreatment of seawater, and microorganisms are used to decompose and degrade organic pollutants, thereby reducing their impact on the membrane system; the biological treatment index Swc is calculated and evaluated, which is used to quantify the efficiency and performance of the biological pretreatment system to ensure the stable operation and treatment effect of the biological pretreatment system.

[0062] (2) This is a cleaning method for effectively removing organic contamination from membranes. Through chemical pretreatment, the overall efficiency of seawater treatment is improved, the burden of subsequent cleaning and treatment is reduced, the membrane system is protected from damage by large particles and suspended matter, and the service life of the membrane system is extended; through cleaning, organic pollutants and other impurities on the membrane are removed, the permeability and treatment efficiency of the membrane are restored, and at the same time the service life of the membrane system is extended, and maintenance and replacement costs are reduced; by calculating and evaluating the centrifugal index Lxzs, the effect of centrifugal separation is quantified to ensure the stability and efficiency of the centrifugal separation process; by high-pressure flushing, the membrane surface is ensured to be clean to prevent residual pollutants from affecting the treatment effect; and by comprehensively analyzing various indicators, the cleaning effect is evaluated, and the subsequent treatment strategy is guided to improve the efficiency and effect of the overall treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 The present invention is a schematic flow chart of a cleaning method for effectively removing organic contamination from a membrane. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0065] Example 1

[0066] See also Figure 1 The present invention provides a cleaning method for effectively removing organic contamination from a membrane, comprising the following steps:

[0067] Step 1: Collect sea area maps, build a three-dimensional map model, divide the sea area into several areas at equal intervals, and divide and mark the several areas on the three-dimensional map model;

[0068] At the same time, seawater quality data from different sea areas are collected, a seawater sample set is established, and the seawater sample set is analyzed to obtain the organic pollution index Yjw of several areas; if the organic pollution index Yjw exceeds the pollution threshold A1, a first warning instruction is issued; if the seawater organic pollution index Yjw is lower than the pollution threshold A1, it means that the seawater in the current area is suitable for collection, which is convenient for subsequent processing and conversion into drinking water after cleaning, and is marked as a qualified area;

[0069] Step 2: Extract seawater from the qualified area, perform the first biological pretreatment after production and processing, and collect data from the first biological pretreatment process to construct a biological data set; calculate and obtain the biological treatment index Swc based on the biological data set; and preset the biological threshold A2 and the biological treatment index Swc for evaluation. If the biological threshold A 2 If it is less than the biological treatment index Swc, a second instruction is issued and biological treatment is repeated;

[0070] Step 3: pre-treat the seawater in the area with qualified biological treatment index Swc; preliminarily filter the seawater, then add coagulant and flocculant respectively, and finally precipitate to obtain clean water; perform multi-media filtration and fine filtration on the clean water after precipitation, and finally disinfect it; after the seawater pre-treatment is completed, it is cleaned to remove organic pollutants in the membrane system;

[0071] Step 4: Stop the operation of the membrane system, drain the water in the membrane system, perform physical and chemical cleaning on the membrane system in sequence, and finally flush the membrane system; after the flushing is completed, collect the cleaning parameters of the membrane system, build a cleaning data set, extract the cleaning data set and calculate to obtain the first cleaning coefficient Qxs1, and evaluate the first cleaning coefficient Qxs1 to generate different solutions; then reconnect the membrane system to the system and gradually resume the operation of the membrane system;

[0072] Step 5: Centrifuge the cleaned seawater; after centrifugation, high-pressure flushing is performed again to remove residual cleaning agents and pollutants on the membrane surface; after flushing, the permeability Tgl, salt interception rate Yfl and organic pollutant content Wrl in the seawater are collected and a second cleaning coefficient Qxs2 is constructed; at the same time, the second cleaning coefficient Qxs2 is evaluated to generate different response strategies.

[0073] In this embodiment, the sea area is divided into several areas at equal intervals, and these areas are divided and marked to facilitate the management and monitoring of the sea area; the seawater organic pollution index Yjw and the pollution threshold A1 are compared to distinguish between unsuitable areas and suitable areas, improve resource utilization efficiency, and reduce treatment and cleaning costs; the seawater in the suitable area is then biologically pretreated, and microorganisms are used to decompose and degrade organic pollutants, thereby reducing their impact on the membrane system; the membrane system is cleaned after the seawater is chemically treated; the cleaning and reprocessing work of the membrane system is multiple evaluated through the first cleaning coefficient Qxs1 and the second cleaning coefficient Qxs2, and different response strategies and plans are formulated.

[0074] Example 2

[0075] See also Figure 1 , the seawater areas divided in the three-dimensional model are marked as QY1, QY2, QY3, ...QY n , n represents the number of segmented regions; the seawater sample set includes lower chemical parameters: water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs;

[0076] The pH value of water quality Sz refers to the negative logarithm of the hydrogen ion concentration in the solution, which is used to measure the acidity and alkalinity of water and is obtained by pH test paper testing;

[0077] Dissolved oxygen Rjy refers to oxygen dissolved in water, which is used to decompose organic matter and degrade pollutants, and is measured by electrochemical sensors;

[0078] Salt concentration Ynd refers to the total amount of dissolved salts in the water body. The conductivity is measured by the conductivity method to calculate the salt concentration in seawater.

[0079] The heavy metal content Zjs refers to the content of metal elements with high density and large atomic weight in seawater. The content of specific heavy metal elements in seawater samples is determined by atomic absorption spectroscopy, which utilizes the absorption of light of specific wavelengths.

[0080] The pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs of the seawater sample were extracted and dimensionless, and the seawater organic pollution index Yjw was calculated by the following formula:

[0081]

[0082] Wherein, w1, w2, w3 and w4 represent the weight values ​​of water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs respectively, and w1+w2+w3+w4=1, 0≤w1<1, 0≤w2<1, 0≤w3<1, 0≤w4<1, the specific value is adjusted by the user, and B represents the first correction coefficient;

[0083] The following results are generated by evaluating the preset pollution threshold A1 and the seawater organic pollution index Yjw:

[0084] If the preset pollution threshold A1>seawater organic pollution index Yjw, it means that the cost of removing organic pollution from seawater membranes in the current area is low and suitable for cleaning. At this time, the first result is generated and biological treatment is performed;

[0085] If the preset pollution threshold A1 ≤ seawater organic pollution index Yjw, it means that the cost of removing organic pollution from seawater membrane in the current area is high and it is not suitable for cleaning, and the second result is generated at this time.

[0086] In this embodiment, the water quality pH value Sz reflects the hydrogen ion concentration in seawater, and the change in pH value reflects the acidity and alkalinity of seawater, which has an important impact on biological growth, chemical reactions and soluble substances in seawater; dissolved oxygen Rjy measures the amount of oxygen dissolved in seawater and reflects the oxygen supply in seawater; salt concentration Ynd is responsible for measuring the concentration of dissolved salt substances in seawater, and affects the density, buoyancy, freezing point and evaporation of seawater; heavy metal content Zjs reflects the degree of pollution of heavy metal elements in seawater; when the seawater organic pollution index Yjw in a certain area is greater than or equal to the preset pollution threshold A1, it means that the pollution level in the area is high, the cost of cleaning the membrane system is high, and it is not suitable for cleaning treatment, so as to improve the utilization efficiency of cleaning resources.

[0087] Example 3

[0088] The biological data set includes: biological density per cubic meter Msw, biological growth rate Szl, and species number Wz;

[0089] The biological density per cubic meter Msw refers to the number of organisms in each cubic meter of seawater. Image data is obtained through remote sensing technology, and the density of organisms is detected through image processing and analysis;

[0090] The biological growth rate Szl refers to the weekly growth rate of biological individuals in seawater. It is also obtained by obtaining image data using remote sensing technology and calculating it through image processing and analysis.

[0091] The number of species Wz refers to the number of different types of organisms present in each cubic meter of seawater. The presence and number of species are determined by DNA in seawater samples;

[0092] The biological density per cubic meter Msw, biological growth rate Szl and species number Wz in the biological data set are extracted and dimensionlessly processed to obtain the biological treatment index Swc using the following formula:

[0093]

[0094] Where, Msw i represents the biomass density per cubic meter in the ith area; Szl i represents the biological growth rate of the ith region; Wz i represents the number of species in the ith region; n represents the total number of regions;

[0095] q1, q2 and q3 represent the weight values ​​of biological density Msw per cubic meter, biological growth rate Szl and species quantity Wz respectively, and q1+q2+q3=1, 0≤q1<1, 0≤q2<1, 0≤q3<1, the specific value is adjusted by the user, and C represents the second correction coefficient;

[0096] By evaluating the preset biological threshold A2 and the biological treatment index Swc, the following instructions are generated:

[0097] If the preset biological threshold value A2>biological treatment index Swc, it means that the biological treatment index Swc in the current seawater is qualified, the biological density Msw per cubic meter, the biological growth rate Szl and the number of species Wz are normal, and the first instruction is generated at this time, and pretreatment and cleaning are performed;

[0098] If the preset biological threshold A2≤biological treatment index Swc, it means that the biological treatment index Swc in the current seawater is unqualified, and the biological density Msw, biological growth rate Szl and species number Wz per cubic meter are abnormal. At this time, the second instruction is generated and biological treatment is performed again.

[0099] In this embodiment, the biological density per cubic meter Msw reflects the richness and diversity of the biological ecosystem. A high-density biological community will form a biofilm or biological attachment on the surface of the membrane system, causing blockage and pollution of the membrane system, affecting the permeability and performance of the membrane; the biological growth rate Szl reflects the reproduction and growth status of organisms in seawater. Some microorganisms or biological metabolites have biodegradability, but also produce harmful substances, affecting the material and performance of the membrane; the number of species Wz reflects the biodiversity of the ocean. Different types of organisms will have different effects on the membrane system. Some organisms will form biofilms, while others will produce biological toxic substances; by evaluating the biological treatment index Swc, defects in biological pretreatment can be promptly processed and adjusted to ensure water quality safety.

[0100] Example 4

[0101] Install a coarse screen with a pore size of 1-5 mm to remove large particles, seaweed and debris in the seawater to prevent them from entering subsequent treatment equipment; add flocculants after adding coagulants into the mixing tank and let it stand for 20-30 minutes to form stable flocs, and use gravity to settle the flocs; then filter the precipitated clean water through a sand filter for multi-media filtration, and then use a microfiltration membrane with a pore size of 0.1-1 micron for microfiltration.

[0102] Make the membrane system completely still, drain the water in the membrane system, and use low-pressure reverse water flow of 1.5-2 times the working pressure to backwash the membrane system for 10-15 minutes to remove loose particles and suspended matter on the membrane surface; inject chemical cleaning liquid into the membrane system and circulate the chemical cleaning liquid in the membrane system for 30-60 minutes, and finally use pre-treated clean water to flush the membrane system to remove the chemical cleaning liquid and decomposed organic pollutants;

[0103] The cleaning data set includes: membrane flux Mtl, inlet and product water quality difference Jccz, backwash flow Fcx and pressure recovery rate Ylh; membrane flux Mtl refers to the volume flow through the membrane in liters per square meter per hour. The total water volume of the membrane is measured by the flow meter installed at the water outlet of the membrane system, and the filtration time and effective filtration area are collected for calculation. The calculation formula is: Where V represents the total water volume of the membrane, Mj represents the effective filtration area of ​​the membrane, and t represents the filtration time;

[0104] The difference between the inlet and product water quality Jccz refers to the difference between the water quality parameters of the inlet and product water. It is obtained by installing a water quality analyzer on the inlet and product water pipelines, collecting and calculating the data. The calculation formula is: Jccz = P in -P out , where P in Expressed as influent water quality parameter, P out Expressed as produced water quality parameters;

[0105] The backwash flow rate Fcx refers to the water flow rate passing through the membrane during the backwash process, which is obtained by installing a flow meter on the backwash pipe and measuring it in real time;

[0106] The pressure recovery rate Ylh refers to the degree to which the operating pressure of the membrane system recovers to its initial state after cleaning. It is calculated by installing pressure sensors at the inlet and outlet of the membrane system and monitoring the operating pressure before and after cleaning in real time. The calculation formula is: P cleaned Expressed as the operating pressure after cleaning, P initial Expressed as initial operating pressure.

[0107] The membrane flux Mtl, the difference in inlet and outlet water quality Jccz, the backwash flow Fcx and the pressure recovery rate Ylh in the cleaning data set are extracted and dimensionlessly processed, and the first cleaning coefficient Qxs1 is calculated by the following formula:

[0108] Qxs1=e1*Mtl+e2*Jccz-e3*Fcx+e4*Ylh+D

[0109] Wherein, e1, e2, e3 and e4 represent the weight values ​​of membrane flux Mtl, inlet and product water quality difference Jccz, backwash flow Fcx and pressure recovery rate Ylh, and e1+e2+e3+e4=1, 0≤e1<1, 0≤e2<1, 0≤e3<1, 0≤e4<1, the specific value is adjusted by the user, and D represents the third correction coefficient;

[0110] By comparing the preset processing threshold A3 and the first cleaning coefficient Qxs1, the following solution is generated:

[0111] If the processing threshold value A3> the first cleaning coefficient Qxs1, it means that the current membrane system cleaning effect is qualified, and centrifugal separation is performed at this time to generate the first solution;

[0112] If the processing threshold value A3 ≤ the first cleaning coefficient Qxs1, it means that the current membrane system cleaning effect is unsatisfactory. In this case, a secondary cleaning is performed to generate a second solution.

[0113] In this embodiment, large particles, seaweed and other impurities in seawater are removed in order to reduce the load of subsequent treatment equipment and reduce the pollution risk of the membrane system; after the formation of coagulation and floccules, suspended matter and colloidal particles are removed from the water by gravity sedimentation, thereby purifying the water quality; the purity of the water quality is improved by multi-media filtration and microfiltration; the cleaning effect is quantified by calculating the first cleaning coefficient Qxs1; the membrane flux Mtl has a direct impact on the water production of the membrane system, and a high membrane flux means that more water is processed per unit area; the difference in inlet and outlet water quality Jccz reflects the purification effect of the membrane system on the water quality, and a higher difference means that the membrane system removes pollutants in the water more effectively; the backwash flow Fcx is used to clean the membrane surface, remove dirt and impurities on the membrane, and restore the permeability of the membrane; the pressure recovery rate Ylh reflects the degree of recovery of the operating pressure of the membrane system after cleaning, and a higher pressure recovery rate means that the operating pressure of the membrane system can be quickly restored to the initial state, maintaining the stability and reliability of the system.

[0114] Example 5

[0115] Transmittance Tgl refers to the degree of light transmission through water, reflecting the transparency and cleanliness of the water. It is obtained by measuring the degree of light transmission through the water sample through a transmittance measuring instrument.

[0116] The salt interception rate Yfl refers to the efficiency of removing salt during seawater treatment, reflecting the degree of reduction in the salinity of desalinated water. The conductivity of the water sample before and after treatment is measured by a conductivity instrument, and the salt interception rate is calculated based on the change in conductivity. The specific formula is: Among them, σ t is the conductivity of the water sample after treatment, σ0 is the conductivity of the water sample before treatment;

[0117] The organic pollutant content Wrl refers to the concentration of organic pollutants in seawater, including organic dissolved matter and suspended particles. It reflects the degree of pollution and the treatment effect of the water body and is obtained by analyzing seawater samples with a mass spectrometer.

[0118] After dimensionless processing of the permeability Tgl, the salt interception rate Yfl and the organic pollutant content Wrl, the second cleaning coefficient Qxs2 is calculated by the following formula:

[0119]

[0120] Wherein, t represents the time range, Tgl(t), Yfl(t) and Wrl(t) represent the variation curves of permeability Tgl, salt interception rate Yfl and organic pollutant content Wrl with time t, respectively.

[0121] By comparing the preset first cleaning threshold C and the second cleaning threshold D with the second cleaning coefficient Qxs2, and the first cleaning threshold C> the second cleaning threshold D, the following response strategy is generated:

[0122] If the second cleaning coefficient Qxs2> the second cleaning threshold C, it means that the current seawater cleaning quality is unqualified and seawater circulation cleaning is required. At this time, the first strategy is generated;

[0123] If the first cleaning threshold C> the second cleaning coefficient Qxs2≥ the second cleaning threshold D, it means that the current seawater cleaning is unqualified, and the seawater is cleaned again using ultrasonic cleaning technology, and the second strategy is generated at this time;

[0124] If the second cleaning threshold D> the second cleaning coefficient Qxs2, it means that the current seawater cleaning quality is qualified and can be put into use. At this time, the third strategy is generated.

[0125] In this embodiment, the higher the transmittance Tgl, the clearer the water quality, the salt interception rate Yfl is used to understand the degree of salinity reduction in the seawater treatment process, and the organic pollutant content Wrl evaluates the efficiency of the seawater treatment system in removing organic pollutants; different cleaning strategies are selected for seawater according to the degree of cleaning of the seawater, and the ultrasonic cleaning technology can remove pollutants and impurities on the membrane surface at a microscopic level, improve the cleaning effect, thereby ensuring the normal operation of the seawater treatment equipment and ensuring the high efficiency of the treated water quality, saving time and cleaning resources.

[0126] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cleaning method for effectively removing organic contamination from a membrane, characterized in that: The following steps are involved: Step 1: Collect sea area maps, build a three-dimensional map model, divide the sea area into several areas at equal intervals, and divide and mark the several areas on the three-dimensional map model; At the same time, seawater quality data from different sea areas were collected to establish a seawater sample set, and the seawater sample set was analyzed to obtain the organic pollution index Yjw of several regions; the water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs in the seawater sample set were extracted, and after dimensionless processing, the seawater organic pollution index Yjw was calculated using the following formula: Wherein, w1, w2, w3 and w4 represent the weight values ​​of water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs respectively, and w1+w2+w3+w4=1, 0≤w1<1, 0≤w2<1, 0≤w3<1, 0≤w4<1, the specific value is adjusted by the user, and B represents the first correction coefficient; If the organic pollution index Yjw exceeds the pollution threshold A1, the first warning instruction is issued. If the seawater organic pollution index Yjw is lower than the pollution threshold A1, it means that the seawater in the current area is suitable for collection, which is convenient for subsequent processing and cleaning to be converted into drinking water, and is marked as a qualified area; Step 2: extract seawater from the qualified area, perform biological pretreatment after production and processing, and collect data during the biological pretreatment process to construct a biological data set; Based on the biological data set, the following were calculated: biological treatment index Swc; The biological data set includes: biological density per cubic meter Msw, biological growth rate Szl, and species number Wz; The biological density per cubic meter Msw refers to the number of organisms in each cubic meter of seawater. Image data is obtained through remote sensing technology, and the density of organisms is detected through image processing and analysis; The biological growth rate Szl refers to the weekly growth rate of biological individuals in seawater. It is also obtained by obtaining image data using remote sensing technology and calculating it through image processing and analysis. The number of species Wz refers to the number of different types of organisms present in each cubic meter of seawater. The presence and number of species are determined by DNA in seawater samples; The biological density per cubic meter Msw, biological growth rate Szl and species number Wz in the biological data set are extracted and dimensionlessly processed to obtain the biological treatment index Swc using the following formula: Where, Msw i represents the biomass density per cubic meter in the ith area; Szl i represents the biological growth rate of the ith region; Wz i represents the number of species in the ith region; n represents the total number of regions; q1, q2 and q3 represent the weight values ​​of biological density Msw per cubic meter, biological growth rate Szl and species quantity Wz respectively, and q1+q2+q3=1, 0≤q1<1, 0≤q2<1, 0≤q3<1, the specific value is adjusted by the user, and C represents the second correction coefficient; The biological threshold value A2 and the biological treatment index Swc are preset for evaluation. If the biological threshold value A2 is less than the biological treatment index Swc, a second instruction is issued and biological pretreatment is performed again; Step 3: Chemically pre-treat the seawater in the area with qualified biological treatment index Swc; preliminarily filter the seawater, then add coagulant and flocculant respectively, and finally precipitate to obtain clean water; perform multi-media filtration and fine filtration on the clean water after precipitation, and finally disinfect it; after the chemical pre-treatment of the seawater is completed, it is cleaned to remove organic pollutants in the membrane system; Step 4: Stop the operation of the membrane system, drain the water in the membrane system, perform physical and chemical cleaning on the membrane system in sequence, and finally flush the membrane system; after the flushing is completed, collect the cleaning parameters of the membrane system, build a cleaning data set, extract the cleaning data set and calculate to obtain the first cleaning coefficient Qxs1, and evaluate the first cleaning coefficient Qxs1 to generate different solutions; then reconnect the membrane system to the system and gradually resume the operation of the membrane system; Make the membrane system completely still, drain the water in the membrane system, and use low-pressure reverse water flow of 1.5-2 times the working pressure to backwash the membrane system for 10-15 minutes to remove loose particles and suspended matter on the membrane surface; inject chemical cleaning liquid into the membrane system and circulate the chemical cleaning liquid in the membrane system for 30-60 minutes, and finally use pre-treated clean water to flush the membrane system to remove the chemical cleaning liquid and decomposed organic pollutants; The cleaning data set includes: membrane flux Mtl, inlet and product water quality difference Jccz, backwash flow Fcx and pressure recovery rate Ylh; membrane flux Mtl refers to the volume flow through the membrane in liters per square meter per hour. The total water volume of the membrane is measured by the flow meter installed at the water outlet of the membrane system, and the filtration time and effective filtration area are collected for calculation. The calculation formula is: Where V represents the total water volume of the membrane, Mj represents the effective filtration area of ​​the membrane, and t represents the filtration time; The difference between the inlet and product water quality Jccz refers to the difference between the water quality parameters of the inlet and product water. It is obtained by installing a water quality analyzer on the inlet and product water pipelines, collecting and calculating the data. The calculation formula is: Jccz = P in -P out , where P in Expressed as influent water quality parameter, P out Expressed as produced water quality parameters; The backwash flow rate Fcx refers to the water flow rate passing through the membrane during the backwash process, which is obtained by installing a flow meter on the backwash pipe and measuring it in real time; The pressure recovery rate Ylh refers to the degree to which the operating pressure of the membrane system recovers to its initial state after cleaning. It is calculated by installing pressure sensors at the inlet and outlet of the membrane system and monitoring the operating pressure before and after cleaning in real time. The calculation formula is: Where P cleaned Expressed as the operating pressure after cleaning, P initial Expressed as initial touch operating pressure; The membrane flux Mtl, the difference in inlet and outlet water quality Jccz, the backwash flow Fcx and the pressure recovery rate Ylh in the cleaning data set are extracted and dimensionlessly processed, and the first cleaning coefficient Qxs1 is calculated by the following formula: Qxs1=e1*Mtl+e2*Jccz-e3*Fcx+e4*Ylh+D Wherein, e1, e2, e3 and e4 represent the weight values ​​of membrane flux Mtl, inlet and product water quality difference Jccz, backwash flow Fcx and pressure recovery rate Ylh, and e1+e2+e3+e4=1, 0≤e1<1, 0≤e2<1, 0≤e3<1, 0≤e4<1, the specific value is adjusted by the user, and D represents the third correction coefficient; By comparing the preset processing threshold A3 and the first cleaning coefficient Qxs1, the following solution is generated: If the processing threshold value A3> the first cleaning coefficient Qxs1, it means that the current membrane system cleaning effect is qualified, and centrifugal separation is performed at this time to generate the first solution; If the processing threshold value A3 ≤ the first cleaning coefficient Qxs1, it means that the current membrane system cleaning effect is unsatisfactory, and a secondary cleaning is performed to generate the second solution; Step 5: centrifuge the cleaned seawater; after centrifugation, high-pressure flushing is performed again to remove the residual cleaning agent and pollutants on the membrane surface; after flushing, the permeability Tgl, salt interception rate Yfl and organic pollutant content Wrl in the seawater are collected and the second cleaning coefficient Qxs2 is constructed; at the same time, the second cleaning coefficient Qxs2 is evaluated to generate different response strategies; Transmittance Tgl refers to the degree of light transmission through water, reflecting the transparency and cleanliness of the water. It is obtained by measuring the degree of light transmission through the water sample through a transmittance measuring instrument. The salt interception rate Yfl refers to the efficiency of removing salt during seawater treatment, reflecting the degree of reduction in salinity of desalinated water. The conductivity of the water sample before and after treatment is measured by a conductivity instrument, and the salt interception rate is calculated based on the change in conductivity. The specific formula is: Among them, σ t is the conductivity of the water sample after treatment, σ0 is the conductivity of the water sample before treatment; Organic pollutant content Wrl refers to the concentration of organic pollutants in seawater, including organic dissolved matter and suspended particles, which reflects the degree of pollution and treatment effect of the water body. It is obtained by analyzing seawater samples with a mass spectrometer; After dimensionless processing of the permeability Tgl, the salt interception rate Yfl and the organic pollutant content Wrl, the second cleaning coefficient Qxs2 is calculated by the following formula: Wherein, t represents the time range, Tgl(t), Yfl(t) and Wrl(t) represent the variation curves of permeability Tgl, salt interception rate Yfl and organic pollutant content Wrl with time t, respectively.

2. A cleaning method for effectively removing organic contamination from a membrane according to claim 1, characterized in that: The seawater areas divided in the three-dimensional model are marked as QY1, QY2, QY3, ...QY n , n represents the number of segmented regions; the seawater sample set includes the following chemical parameters: water quality pH value Sz, dissolved oxygen Rjy, salt concentration Ynd and heavy metal content Zjs; The pH value of water quality Sz refers to the negative logarithm of the hydrogen ion concentration in the solution, which is used to measure the acidity and alkalinity of water and is obtained by pH test paper testing; Dissolved oxygen Rjy refers to oxygen dissolved in water, which is used to decompose organic matter and degrade pollutants, and is measured by electrochemical sensors; Salt concentration Ynd refers to the total amount of dissolved salts in the water body. The conductivity is measured by the conductivity method to calculate the salt concentration in seawater. The heavy metal content Zjs refers to the content of metal elements with high density and large atomic weight in seawater. The content of specific heavy metal elements in seawater samples is determined by atomic absorption spectroscopy, which utilizes the absorption of light of specific wavelengths.

3. A cleaning method for effectively removing organic contamination from a membrane according to claim 2, characterized in that: The following results are generated by evaluating the preset pollution threshold A1 and the seawater organic pollution index Yjw: If the preset pollution threshold A1>seawater organic pollution index Yjw, it means that the cost of removing organic pollution from seawater membranes in the current area is low and suitable for cleaning. At this time, the first result is generated and biological treatment is performed; If the preset pollution threshold A1 ≤ seawater organic pollution index Yjw, it means that the cost of removing organic pollution from seawater membrane in the current area is high and it is not suitable for cleaning, and the second result is generated at this time.

4. A cleaning method for effectively removing organic contamination from a membrane according to claim 1, characterized in that: By evaluating the preset biological threshold A2 and the biological treatment index Swc, the following instructions are generated: If the preset biological threshold value A2>biological treatment index Swc, it means that the biological treatment index Swc in the current seawater is qualified, the biological density Msw per cubic meter, the biological growth rate Szl and the number of species Wz are normal, and the first instruction is generated at this time, and pretreatment and cleaning are performed; If the preset biological threshold A2≤biological treatment index Swc, it means that the biological treatment index Swc in the current seawater is unqualified, and the biological density Msw, biological growth rate Szl and species number Wz per cubic meter are abnormal. At this time, the second instruction is generated and biological treatment is performed again.

5. A cleaning method for effectively removing organic contamination from a membrane according to claim 1, characterized in that: Install a coarse screen with a pore size of 1-5 mm to remove large particles, seaweed and debris in the seawater to prevent them from entering subsequent treatment equipment; after adding the coagulant into the mixing tank, add the flocculant and let it stand for 20-30 minutes to form a stable floc, and use gravity to settle the floc; then filter the precipitated clean water through a sand filter for multi-media filtration, and then use a microfiltration membrane with a pore size of 0.1-1 micron for microfiltration.

6. A cleaning method for effectively removing organic contamination from a membrane according to claim 1, characterized in that: By comparing the preset first cleaning threshold C and the second cleaning threshold D with the second cleaning coefficient Qxs2, and the first cleaning threshold C> the second cleaning threshold D, the following response strategy is generated: If the second cleaning coefficient Qxs2> the first cleaning threshold C, it means that the current seawater cleaning quality is unqualified and seawater circulation cleaning is required. At this time, the first strategy is generated; If the first cleaning threshold C> the second cleaning coefficient Qxs2≥ the second cleaning threshold D, it means that the current seawater cleaning is unqualified, and the seawater is cleaned again using ultrasonic cleaning technology, and the second strategy is generated at this time; If the second cleaning threshold D> the second cleaning coefficient Qxs2, it means that the current seawater cleaning quality is qualified and can be put into use. At this time, the third strategy is generated.

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