Intelligent regulation and control ceramic membrane microalgae recovery system and method

Abstract

The invention relates to an intelligent regulation and control ceramic membrane microalgae recovery system and method. The invention relates to the technical field of microalgae recovery, which comprises the following steps: inoculating a target microalgae variety in a microalgae culture pond, and setting proper initial culture conditions such as temperature, illumination intensity and nutrient substance addition amount according to the growth characteristics of microalgae; various parameters in the microalgae culture pond are monitored in real time through the intelligent monitoring module; according to monitoring data, the ceramic membrane filtering unit is controlled through the feedback control unit, the filtering performance of a culture solution is improved, and the stability of membrane flux is maintained. Compared with a traditional ceramic membrane recovery method, the method has the advantages that the microalgae recovery efficiency is remarkably improved by 30% or above, the membrane pollution degree is reduced by 40% or above, the economic benefits and environmental benefits of microalgae recovery are greatly improved, and a solid foundation is laid for large-scale industrial development and utilization of microalgae resources.

Description

Technical Field

[0001] The present invention relates to the field of microalgae recovery technology, and is an intelligently controlled ceramic membrane microalgae recovery system and method. In particular, it relates to an innovative system and method for realizing efficient ceramic membrane microalgae recovery by means of an intelligent monitoring and feedback control mechanism, which can be widely used in microalgae separation and recovery processes in many microalgae-related industries such as bioenergy, food additives, and health care product raw materials. Background Art

[0002] Ceramic membrane, also known as inorganic ceramic membrane, is an asymmetric membrane made of inorganic ceramic materials through special processes. Ceramic membranes are divided into tubular ceramic membranes and flat ceramic membranes. The wall of the tubular ceramic membrane is densely covered with micropores. Under pressure, the raw liquid flows inside the membrane tube or outside the membrane, small molecules (or liquids) pass through the membrane, and large molecules (or solids) are retained by the membrane, thereby achieving the purpose of separation, concentration, purification and environmental protection. The flat ceramic membrane is densely covered with micropores. According to the different molecular diameters of the penetrating substances within a certain membrane pore size range, the permeability is different. The pressure difference on both sides of the membrane is the driving force, and the membrane is the filter medium. Under a certain pressure, when the feed liquid flows through the membrane surface, only water, inorganic salts, and small molecules are allowed to pass through the membrane, while large molecules such as suspended matter, glue and microorganisms in the water are prevented from passing through. Ceramic membranes have many advantages, such as high separation efficiency, stable effect, good chemical stability, acid and alkali resistance, organic solvent resistance, bacteria resistance, high temperature resistance, pollution resistance, high mechanical strength, good regeneration performance, simple separation process, low energy consumption, easy operation and maintenance, and long service life. They have been successfully used in many fields such as food, beverages, plant (drug) deep processing, biomedicine, fermentation, fine chemicals, etc., and can be used for separation, clarification, purification, concentration, sterilization, desalination, etc. in the process.

[0003] In the current field of microalgae recycling, traditional ceramic membrane recycling technology faces many challenges. Microalgae exhibit different physiological characteristics and concentration changes in different growth cycles, which makes it difficult for ceramic membrane recycling processes with fixed parameters to maintain high efficiency. On the one hand, the recovery efficiency fluctuates greatly and is difficult to control accurately. In the later stage of microalgae growth, when the cell density is too high, the membrane pores are easily blocked, resulting in a sharp drop in the recovery flux; on the other hand, membrane contamination problems occur frequently and are difficult to effectively curb, which greatly shortens the service life of ceramic membranes and increases operating costs and maintenance difficulties. For example, macromolecules such as polysaccharides and proteins produced by microalgae metabolism are easily adsorbed on the membrane surface to form a gel layer, which is difficult to completely remove by conventional cleaning methods. These problems limit the widespread application of microalgae recovery technology in large-scale industrial production. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an intelligently controlled ceramic membrane microalgae recovery system and method.

[0005] The present invention provides the following technical solutions:

[0006] An intelligent control ceramic membrane microalgae recovery system, the system comprising a microalgae culture tank, a ceramic membrane filtration unit, an intelligent monitoring unit, a drug dosing device and a feedback control unit;

[0007] The microalgae culture tank comprises an agitator, a water inlet and a water outlet valve, and the ceramic membrane filtration unit comprises a filtered water inlet, a rotator, a filtered water outlet and a microalgae collection port;

[0008] The microalgae culture tank provides suitable environmental conditions for the growth of microalgae. The agitator makes the microalgae evenly distributed in the culture solution to ensure the uniform intake of nutrients and light.

[0009] The rotator of the ceramic membrane filtration unit is provided with a filtration membrane, and the rotator adopts a spiral flow channel membrane component structure;

[0010] The intelligent monitoring unit monitors various parameters in the microalgae culture pool. When the microalgae concentration rises to the pre-set recovery concentration standard and the membrane flux of the ceramic membrane filtration unit shows signs of decline, the feedback control unit quickly intervenes to optimize the operating parameters of the ceramic membrane filtration unit. The feedback control unit controls the reagent dosing device to add polyaluminium chloride according to the severity of membrane contamination.

[0011] Preferably, the intelligent monitoring unit includes a particle size analyzer, an ultraviolet spectrophotometer and a pressure sensor;

[0012] The particle size of algal cells was measured by a particle size analyzer;

[0013] The UV spectrophotometer was used to measure the UV680 value and UV254 content in the algae-containing water;

[0014] The transmembrane pressure difference of the ceramic membrane during microalgae recovery was measured by a pressure sensor.

[0015] Preferably, the filter membrane disc is made of inorganic material, has a nominal pore size of 100 nm, an operating pressure of 0.1-0.5 bar, an operating temperature of 0-60°C, and a pH range of 0-12;

[0016] The diaphragm includes two membrane layers, with a guide groove inside and a number of liquid outlet holes around the middle. During filtration, the liquid is filtered from the outside to the inside.

[0017] Preferably, the pitch of the spiral flow channel membrane module structure is adjusted between 5-20 cm, the flow channel width is 3-8 mm, and the membrane tube diameter is 10-30 mm.

[0018] A method for recovering microalgae using an intelligently regulated ceramic membrane, the method comprising the following steps:

[0019] Step 1: Inoculate the target microalgae species in the microalgae culture pond, and set appropriate initial culture conditions of temperature, light intensity, and nutrient addition according to the growth characteristics of the microalgae;

[0020] Step 2: Real-time monitoring of various parameters in the microalgae culture pool through the intelligent monitoring module;

[0021] Step 3: Based on the monitoring data, the ceramic membrane filtration unit is controlled through the feedback control unit to improve the filtration performance of the culture solution and maintain the stability of the membrane flux;

[0022] When the membrane flux drops by more than 8% and the microalgae concentration is higher than the set value, the backwash frequency is increased immediately, and the backwash pressure is fine-tuned according to the microalgae particle size distribution to ensure that the pollutants on the membrane surface are efficiently removed while avoiding excessive damage to the microalgae.

[0023] Preferably, after a linear relationship is established between the UV680 value and the algae cell concentration through a linear function y=ax±b by an ultraviolet spectrophotometer, the concentration of the algae cells in the growth stage is obtained by measuring the UV680 value;

[0024] The UV spectrophotometer simultaneously measures the content of UV254 in the algae-containing water, and transmits the data to the feedback control unit through the UV spectrophotometer, providing a basis for determining the growth stage of the microalgae.

[0025] Preferably, the particle size of the algae cells is measured by a particle size analyzer. When the particle size analyzer detects that the particle size of the microalgae culture tank has reached maturity, the data is transmitted to the feedback control unit. The feedback control unit determines the operating parameters of the ceramic membrane filtration unit based on the particle size distribution data and the indicators of UV680 and UV254 to reduce membrane pollution in a targeted manner.

[0026] Preferably, the pressure sensor transmits the transmembrane pressure difference value to the feedback control unit, and the feedback control unit issues a backwash instruction after determining that the transmembrane pressure difference of the ceramic membrane filtration unit exceeds the set value, so that the ceramic membrane can recover its performance as soon as possible, and the feedback control unit controls the reagent dosing device to add polyaluminium chloride;

[0027] When the UV spectrophotometer detects an increase in UV254 data, it indicates that the organic matter index of the culture fluid has increased. When the pressure sensor detects an increase in the transmembrane pressure difference of the ceramic membrane filtration unit, the feedback control unit will be triggered to automatically control the addition of a specific filter aid, polyaluminium chloride, to improve the filtration performance of the culture fluid and maintain the stability of the membrane flux.

[0028] When the dosage of polyaluminium chloride is controlled at 20 mg / L, the transmembrane pressure difference is reduced by more than 40%.

[0029] A computer-readable storage medium stores a computer program, which is executed by a processor to implement an intelligently regulated ceramic membrane microalgae recovery method.

[0030] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements an intelligently controlled ceramic membrane microalgae recovery method when executing the computer program.

[0031] The present invention has the following beneficial effects:

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] Different from the traditional straight-tube or simple elbow-tube flow channel, it can optimize the membrane filtration performance in the microalgae recovery process from a structural perspective. The filtration unit is connected with a high-precision pressure sensor and flow sensor for real-time monitoring of key operating data such as membrane flux and transmembrane pressure difference. The pressure sensor has an accuracy of ±0.01MPa and the flow sensor has an accuracy of ±0.1L / min, which can accurately capture subtle changes in the membrane operation status and provide reliable data support for subsequent feedback control.

[0034] The pool body of the present invention is constructed of anti-corrosion, acid- and alkali-resistant materials, and has a smooth inner wall for easy cleaning and maintenance. The volume can be flexibly designed according to the actual production scale, ranging from a few cubic meters to hundreds of cubic meters. At the same time, it is equipped with a stirring device to evenly distribute the microalgae in the culture solution, thereby ensuring uniform intake of nutrients and light.

[0035] The present invention integrates a variety of advanced sensors and can accurately measure the concentration and particle size distribution of microalgae in the microalgae culture pool.

[0036] The present invention has been verified through a large number of experimental comparisons. Under the same microalgae cultivation and recovery conditions, the intelligent control ceramic membrane microalgae recovery system of the present invention significantly improves the microalgae recovery efficiency by more than 30% and reduces the membrane pollution degree by more than 40% compared with the traditional ceramic membrane recovery method, which greatly improves the economic and environmental benefits of microalgae recovery and lays a solid foundation for the large-scale industrial development and utilization of microalgae resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is the device structure and experimental flow chart of the present invention;

[0039] Figure 2 is a cross-sectional view of the diaphragm of the present invention;

[0040] Figure 3 Schematic diagram of the relationship between algae cell concentration and UV680 value of the present invention;

[0041] Figure 4 It is a schematic diagram of algae cell particle size distribution determination of the present invention;

[0042] Figure 5 It is a schematic diagram of the relationship between the dosage of polyaluminium chloride and membrane fouling resistance according to feedback control of the present invention.

[0043] Among them, 1-microalgae culture tank, 11-water inlet, 12-agitator, 13-water outlet valve; 2-ceramic membrane filtration unit, 21-filtered water inlet, 22-rotator, 23-filtered water outlet, 24-microalgae collection port; 3-particle size analyzer; 4-ultraviolet spectrophotometer; 5-pressure sensor; 6-drug dosing device; 7-feedback control unit. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] The present invention is described in detail below in conjunction with specific embodiments. Specific embodiment one:

[0050] according to Figure 1-Figure 5 As shown, the specific optimization technical solution adopted by the present invention to solve the above technical problems is: the present invention relates to an intelligent control ceramic membrane microalgae recovery system and method.

[0051] An intelligent control ceramic membrane microalgae recovery system, the system comprising a microalgae culture tank 1, a ceramic membrane filtration unit 2, an intelligent monitoring unit, a drug dosing device 6 and a feedback control unit 7;

[0052] The microalgae culture tank 1 includes a stirrer 12, a water inlet 11 and a water outlet valve 13, and the ceramic membrane filtration unit 2 includes a filtered water inlet 21, a rotator 22, a filtered water outlet 23 and a microalgae collection port 24;

[0053] The microalgae culture pool 1 provides suitable environmental conditions for the growth of microalgae, and the microalgae are evenly distributed in the culture solution through the agitator 12 to ensure uniform intake of nutrients and light;

[0054] The rotator 22 of the ceramic membrane filtration unit 2 is provided with a filtration membrane, and the rotator 22 adopts a spiral flow channel membrane component structure;

[0055] The intelligent monitoring unit monitors various parameters in the microalgae culture pool 1. When the microalgae concentration rises to a preset recovery concentration standard and the membrane flux of the ceramic membrane filtration unit 2 shows signs of decreasing, the feedback control unit 7 quickly intervenes to optimize the operating parameters of the ceramic membrane filtration unit 2. The feedback control unit 7 controls the reagent dosing device 6 to add polyaluminium chloride according to the severity of membrane contamination.

[0056] Microalgae culture pool 1: Provides suitable environmental conditions for the growth of microalgae, equipped with conventional control devices such as temperature and light to ensure the stable growth of microalgae. The pool body is constructed of anti-corrosion, acid and alkali resistant materials, with a smooth inner wall for easy cleaning and maintenance. Its volume can be flexibly designed according to the actual production scale, ranging from a few cubic meters to hundreds of cubic meters. It is also equipped with a stirring device to evenly distribute the microalgae in the culture solution to ensure uniform intake of nutrients and light.

[0057] Ceramic membrane filtration unit 2: It adopts a specially designed spiral flow channel membrane component structure. This unique design significantly prolongs the contact time and contact area between the microalgae and the membrane surface, effectively improves the material exchange efficiency between the microalgae and the membrane, and thus improves the recovery effect. The pitch of the spiral flow channel can be adjusted between 5-20 cm, the flow channel width is 3-8 mm, and the membrane tube diameter is 10-30 mm. This size design has been optimized through multiple experiments and can minimize energy consumption while ensuring flux. At the same time, the spiral flow channel facilitates the formation of strong water flow disturbances during backwashing, which is more conducive to removing impurities and microalgae residues attached to the membrane surface, reducing the degree of membrane contamination, and providing guarantees for long-term stable operation. Different from traditional straight-tube or simple elbow flow channels, it can structurally optimize the membrane filtration performance during the microalgae recovery process. The filtration unit is connected with a high-precision pressure sensor 5 and a flow sensor for real-time monitoring of key operating data such as membrane flux and transmembrane pressure difference. The pressure sensor 5 has an accuracy of ±0.01MPa and the flow sensor has an accuracy of ±0.1L / min, which can accurately capture subtle changes in the membrane operating state and provide reliable data support for subsequent feedback control.

[0058] The ceramic ultrafiltration material is inorganic material filtering inward. The disc is made of inorganic material, with a nominal pore size of 100nm, an operating pressure of 0.-0.5bar, an operating temperature of 0-60℃, and a pH range of 0-12. The membrane includes two membrane layers, with a guide groove inside and a number of liquid outlet holes around the middle. When filtering, the liquid is filtered from the outside to the inside.

[0059] Intelligent monitoring unit: It integrates a variety of advanced sensors to accurately measure the concentration and particle size distribution of microalgae in the microalgae culture pool 1. The particle size analyzer 3 based on the laser scattering principle can obtain the particle size information of microalgae in real time. Its measurement range is 1-100 microns and the resolution is 0.1 microns, which provides an important basis for judging the growth stage of microalgae. Continuously monitor the parameters such as UV680 and UV254 of the culture solution to evaluate the number of algae cells, the organic matter content and the accumulation of microalgae metabolites. These data are critical for timely adjusting the microalgae culture environment and predicting the risk of membrane contamination. It is connected to the sensor of the ceramic membrane filtration unit 2, summarizes all monitoring data and transmits them to the feedback control unit 7. The data transmission adopts high-speed and stable wireless transmission technology to ensure the real-time and accuracy of the data. The transmission frequency is once every 5 seconds.

[0060] After the UV spectrophotometer 4 establishes a linear relationship between the UV680 value and the algae cell concentration through the linear function y=ax±b, the concentration of algae cells in the growth stage can be obtained by measuring the UV680 value. The UV spectrophotometer 4 can also measure the content of UV254 in the algae-containing water. UV254 represents the content of humus organic matter in the water. If the humus content in the algae-containing water is high, it means that the activity of the algae cells is poor, otherwise the activity is good. The activity state of the cells is directly related to the efficiency of the microalgae in the membrane filtration process. The data is transmitted to the feedback control unit 7 through the UV spectrophotometer 4, which provides an important basis for judging the growth stage of the microalgae.

[0061] The particle size of the algae cells is measured by the particle size analyzer 3. The particle size is an important indicator for judging the maturity of the algae cell growth. The cell diameter of Chlorella with better maturity can reach 3.0-8.0 μm. When the particle size analyzer 3 detects that the particle size of the microalgae culture pool 1 has reached the maturity stage, the data is transmitted to the feedback control unit 7. The feedback control unit 7 can determine the operating parameters of the ceramic membrane filtration unit 2 according to the particle size distribution data and the indicators of UV680 and UV254 to reduce membrane pollution in a targeted manner.

[0062] The pressure sensor 5 can be used to obtain the transmembrane pressure difference of the ceramic membrane during microalgae recovery. During microalgae recovery, the transmembrane pressure difference increases rapidly in the early stage and reaches a constant value in the later stage. When the pressure sensor 5 transmits the transmembrane pressure difference value to the feedback control unit 7, the feedback control unit 7 determines that the transmembrane pressure difference of the ceramic membrane filtration unit 6 exceeds the set value and then issues a backwashing instruction to restore the performance of the ceramic membrane as soon as possible. At the same time, the feedback control unit 7 will control the reagent dosing device 6 to add polyaluminium chloride according to the severity of the membrane pollution.

[0063] When the UV spectrophotometer 4 detects an increase in UV254 data, it indicates that the organic index of the culture solution has increased, indicating that the macromolecular organic matter or microalgae secretions have increased, which may increase the risk of membrane contamination. When the pressure sensor 5 detects an increase in the transmembrane pressure difference of the ceramic membrane filtration unit 2, it will trigger the feedback control unit 7 to automatically control the addition of specific filter aids, such as an appropriate amount of polyaluminum chloride, to improve the filtration performance of the culture solution and maintain the stability of the membrane flux. The filter aid used in Example 1 of the present invention is polyaluminum chloride. When the polyaluminum chloride is added in an amount of 20 mg / L, the transmembrane pressure difference can be reduced by more than 40%.

[0064] Feedback control unit 7: Rapid calculation and decision-making based on the massive data transmitted by the intelligent monitoring module, dynamically adjusting parameters according to the characteristics of different growth stages of microalgae and the operating status of the membrane, while traditional methods mostly use fixed parameter settings. The algorithm uses a machine learning model, which is trained and optimized with a large amount of experimental data, and can accurately predict the membrane fouling trend and the best time to recover microalgae. When it is monitored that the concentration of microalgae reaches the preset recovery threshold and the membrane flux begins to show a downward trend, the automatic adjustment program is quickly started to optimize the operating parameters of the ceramic membrane filtration unit. For example, in the early stage of microalgae growth, since the microalgae cells are relatively fragile, the feedback control unit will instruct the ceramic membrane filtration unit to appropriately reduce the filtration flow rate, which can generally be controlled below 0.05m / s, thereby effectively reducing the mechanical damage to the microalgae cells and ensuring the integrity and activity of the microalgae; in the vigorous growth period of microalgae, when the microalgae concentration rises sharply and the membrane flux is still in a relatively stable stage, the filtration pressure is increased in a timely manner, which can be gradually increased to 0.3MPa, and the backwashing strategy is optimized simultaneously, such as shortening the backwashing interval to 15 minutes and extending the backwashing time to 60 seconds, so as to ensure that the microalgae are efficiently recovered while effectively preventing the aggravation of membrane pollution. The operating parameters are flexibly adjusted according to the changes in the characteristics of the culture fluid. When the UV254 monitoring data shows that the organic matter index of the culture fluid increases, it indicates that the macromolecular organic matter or microalgae secretions increase, which may increase the risk of membrane pollution. At this time, the feedback control unit automatically controls the addition of specific filter aids, such as an appropriate amount of polyaluminum chloride, etc. The amount of addition can be calculated and determined according to the specific proportion of the organic matter amplitude to improve the filtration performance of the culture fluid and maintain the stability of the membrane flux. Specific embodiment 2:

[0066] The difference between the second embodiment of the present invention and the first embodiment is that:

[0067] The intelligent monitoring unit includes a particle size analyzer 3, an ultraviolet spectrophotometer 4 and a pressure sensor 5;

[0068] The particle size of the algae cells is measured by a particle size analyzer 3;

[0069] The UV spectrophotometer 4 measures the UV680 value and UV254 content in the algae-containing water;

[0070] The transmembrane pressure difference of the ceramic membrane during the recovery of microalgae is measured by the pressure sensor 5 . Specific embodiment three:

[0072] The difference between the third embodiment of the present invention and the second embodiment is that:

[0073] The filter membrane disc is made of inorganic material, with a nominal pore size of 100nm, an operating pressure of 0.1-0.5bar, an operating temperature of 0-60℃, and a pH range of 0-12;

[0074] The diaphragm includes two membrane layers, with a guide groove inside and a number of liquid outlet holes around the middle. During filtration, the liquid is filtered from the outside to the inside. Specific embodiment four:

[0076] The difference between the fourth embodiment of the present invention and the third embodiment is that:

[0077] The pitch of the spiral flow channel membrane component structure is adjusted between 5-20 cm, the flow channel width is 3-8 mm, and the membrane tube diameter is 10-30 mm. Specific embodiment five:

[0079] The difference between the fifth embodiment of the present invention and the fourth embodiment is that:

[0080] The present invention provides a method for recovering microalgae using an intelligently regulated ceramic membrane, the method comprising the following steps:

[0081] Step 1: Inoculate the target microalgae species in the microalgae culture pool 1, and set appropriate initial culture conditions of temperature, light intensity, and nutrient addition amount according to the growth characteristics of the microalgae;

[0082] Step 2: Real-time monitoring of various parameters in the microalgae culture pool 1 through the intelligent monitoring module;

[0083] Step 3: Based on the monitoring data, the ceramic membrane filtration unit is controlled through the feedback control unit to improve the filtration performance of the culture solution and maintain the stability of the membrane flux;

[0084] When the membrane flux drops by more than 8% and the microalgae concentration is higher than the set value, the backwash frequency is immediately increased and the backwash pressure is fine-tuned according to the microalgae particle size distribution to ensure that while pollutants on the membrane surface are efficiently removed, excessive damage to the microalgae is avoided. Specific embodiment six:

[0086] The difference between the sixth embodiment of the present invention and the fifth embodiment is that:

[0087] After the UV680 value and the algae cell concentration are linearly related by the linear function y=ax±b by the ultraviolet spectrophotometer 4, the concentration of the algae cells in the growth stage is obtained by measuring the UV680 value;

[0088] The ultraviolet spectrophotometer 4 simultaneously measures the content of UV254 in the algae-containing water, and transmits the data to the feedback control unit through the ultraviolet spectrophotometer 4, providing a basis for determining the growth stage of the microalgae. Specific embodiment seven:

[0090] The difference between the seventh embodiment of the present invention and the sixth embodiment is that:

[0091] The particle size of the algae cells is measured by the particle size analyzer 3. When the particle size analyzer 3 detects that the particle size of the microalgae culture pool 1 has reached maturity, the data is transmitted to the feedback control unit. The feedback control unit determines the operating parameters of the ceramic membrane filtration unit according to the particle size distribution data and the indicators of UV680 and UV254 to reduce membrane pollution in a targeted manner. Specific embodiment eight:

[0093] The difference between the eighth embodiment of the present invention and the seventh embodiment is that:

[0094] The pressure sensor 5 transmits the transmembrane pressure difference value to the feedback control unit. The feedback control unit determines that the transmembrane pressure difference of the ceramic membrane filtration unit exceeds the set value and issues a backwashing instruction to restore the performance of the ceramic membrane as soon as possible. The feedback control unit controls the reagent dosing device 6 to add polyaluminium chloride.

[0095] When the UV spectrophotometer 4 detects that the UV254 data increases, it indicates that the organic matter index of the culture solution increases. When the pressure sensor 5 detects that the transmembrane pressure difference of the ceramic membrane filtration unit increases, the feedback control unit is triggered to automatically control the addition of a specific filter aid, polyaluminium chloride, to improve the filtration performance of the culture solution and maintain the stability of the membrane flux.

[0096] When the dosage of polyaluminium chloride is controlled at 20 mg / L, the transmembrane pressure difference is reduced by more than 40%. Specific embodiment nine:

[0098] The difference between the ninth embodiment of the present invention and the eighth embodiment is that:

[0099] The present invention provides a computer-readable storage medium on which a computer program is stored. The program is executed by a processor to implement a method for recovering microalgae using an intelligently regulated ceramic membrane.

[0100] The method comprises the following steps:

[0101] Step 1: Inoculate the target microalgae species in the microalgae culture pond, and set appropriate initial culture conditions of temperature, light intensity, and nutrient addition according to the growth characteristics of the microalgae;

[0102] Step 2: Real-time monitoring of various parameters in the microalgae culture pool through the intelligent monitoring module;

[0103] Step 3: Based on the monitoring data, the ceramic membrane filtration unit is controlled through the feedback control unit to improve the filtration performance of the culture solution and maintain the stability of the membrane flux;

[0104] When the membrane flux drops by more than 8% and the microalgae concentration is higher than the set value, the backwash frequency is immediately increased and the backwash pressure is fine-tuned according to the microalgae particle size distribution to ensure that while pollutants on the membrane surface are efficiently removed, excessive damage to the microalgae is avoided. Specific embodiment ten:

[0106] The difference between the tenth embodiment of the present invention and the ninth embodiment is that:

[0107] The present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, an intelligently regulated ceramic membrane microalgae recovery method is implemented.

[0108] The method comprises the following steps:

[0109] Step 1: Inoculate the target microalgae species in the microalgae culture pond, and set appropriate initial culture conditions of temperature, light intensity, and nutrient addition according to the growth characteristics of the microalgae;

[0110] Step 2: Real-time monitoring of various parameters in the microalgae culture pool through the intelligent monitoring module;

[0111] Step 3: Based on the monitoring data, the ceramic membrane filtration unit is controlled through the feedback control unit to improve the filtration performance of the culture solution and maintain the stability of the membrane flux;

[0112] When the membrane flux drops by more than 8% and the microalgae concentration is higher than the set value, the backwash frequency is immediately increased and the backwash pressure is fine-tuned according to the microalgae particle size distribution to ensure that while pollutants on the membrane surface are efficiently removed, excessive damage to the microalgae is avoided. Specific embodiment eleven:

[0114] The difference between the eleventh embodiment of the present invention and the tenth embodiment is that:

[0115] The present invention first inoculates the target microalgae species in the microalgae culture pool according to the standard inoculation process, and sets the initial culture conditions such as appropriate temperature, light intensity, and nutrient addition amount according to the growth characteristics of the microalgae. The intelligent monitoring module is then started to carry out all-round, uninterrupted real-time monitoring of various parameters in the microalgae culture pool. When the microalgae concentration rises to a pre-set recovery concentration standard and the membrane flux of the ceramic membrane filtration unit shows signs of decline, the feedback control unit quickly intervenes. During the recovery process, the feedback control unit strictly analyzes and processes the monitoring data once at a preset time interval, for example, every 20 minutes. If the membrane flux decreases by more than 8% and the microalgae concentration is higher than the set value, the backwashing frequency is immediately increased, and the backwashing pressure is fine-tuned according to the microalgae particle size distribution to ensure that while efficiently removing pollutants on the membrane surface, excessive damage to the microalgae is avoided. After a large number of experimental comparisons and verifications, under the same microalgae cultivation and recovery conditions, the intelligent control ceramic membrane microalgae recovery system of the present invention has significantly improved the microalgae recovery efficiency by more than 30% and reduced the membrane pollution degree by more than 40% compared with the traditional ceramic membrane recovery method, which greatly improves the economic and environmental benefits of microalgae recovery and lays a solid foundation for the large-scale industrial development and utilization of microalgae resources.

[0116] The above is only a preferred embodiment of an intelligent control ceramic membrane microalgae recovery system and method. The protection scope of an intelligent control ceramic membrane microalgae recovery system and method is not limited to the above embodiments. All technical solutions under this idea belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, several improvements and changes without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An intelligent control ceramic membrane microalgae recovery system, characterized by: The system includes a microalgae culture tank, a ceramic membrane filtration unit, an intelligent monitoring unit, a drug dosing device and a feedback control unit; The microalgae culture tank comprises an agitator, a water inlet and a water outlet valve, and the ceramic membrane filtration unit comprises a filtered water inlet, a rotator, a filtered water outlet and a microalgae collection port; The microalgae culture tank provides suitable environmental conditions for the growth of microalgae. The agitator makes the microalgae evenly distributed in the culture solution to ensure the uniform intake of nutrients and light. The rotator of the ceramic membrane filtration unit is provided with a filtration membrane, and the rotator adopts a spiral flow channel membrane component structure; The intelligent monitoring unit monitors various parameters in the microalgae culture pool. When the microalgae concentration rises to the pre-set recovery concentration standard and the membrane flux of the ceramic membrane filtration unit shows signs of decline, the feedback control unit quickly intervenes to optimize the operating parameters of the ceramic membrane filtration unit. The feedback control unit controls the reagent dosing device to add polyaluminium chloride according to the severity of membrane contamination.

2. The system according to claim 1, characterized in that: The intelligent monitoring unit includes a particle size analyzer, a UV spectrophotometer, and a pressure sensor; The particle size of algal cells was measured by a particle size analyzer; The UV spectrophotometer was used to measure the UV680 value and UV254 content in the algae-containing water; The transmembrane pressure difference of the ceramic membrane during microalgae recovery was measured by a pressure sensor.

3. The system according to claim 2, characterized in that: The filter membrane disc is made of inorganic material, with a nominal pore size of 100nm, an operating pressure of 0.1-0.5bar, an operating temperature of 0-60℃, and a pH range of 0-12; The diaphragm includes two membrane layers, with a guide groove inside and a number of liquid outlet holes around the middle. During filtration, the liquid is filtered from the outside to the inside.

4. The system according to claim 3, characterized in that: The pitch of the spiral flow channel membrane component structure is adjusted between 5-20 cm, the flow channel width is 3-8 mm, and the membrane tube diameter is 10-30 mm.

5. An intelligent control ceramic membrane microalgae recovery method, characterized by: The method comprises the following steps: Step 1: Inoculate the target microalgae species in the microalgae culture pond, and set appropriate initial culture conditions of temperature, light intensity, and nutrient addition according to the growth characteristics of the microalgae; Step 2: Real-time monitoring of various parameters in the microalgae culture pool through the intelligent monitoring module; Step 3: Based on the monitoring data, the ceramic membrane filtration unit is controlled through the feedback control unit to improve the filtration performance of the culture solution and maintain the stability of the membrane flux; When the membrane flux drops by more than 8% and the microalgae concentration is higher than the set value, the backwash frequency is immediately increased and the backwash pressure is fine-tuned according to the microalgae particle size distribution to ensure that while pollutants on the membrane surface are efficiently removed, excessive damage to the microalgae is avoided.

6. The method according to claim 5, characterized in that: After the UV680 value and the algae cell concentration are linearly related by the linear function y=ax±b by using an ultraviolet spectrophotometer, the concentration of algae cells in the growth stage can be obtained by measuring the UV680 value; The UV spectrophotometer simultaneously measures the content of UV254 in the algae-containing water, and transmits the data to the feedback control unit through the UV spectrophotometer, providing a basis for determining the growth stage of the microalgae.

7. The method according to claim 6, characterized in that: The particle size of algae cells is measured by a particle size analyzer. When the particle size analyzer detects that the particle size of the microalgae culture pool has reached maturity, the data is transmitted to the feedback control unit. The feedback control unit determines the operating parameters of the ceramic membrane filtration unit based on the particle size distribution data and the indicators of UV680 and UV254 to reduce membrane pollution in a targeted manner.

8. The method according to claim 7, characterized in that: The pressure sensor transmits the transmembrane pressure difference value to the feedback control unit. After the feedback control unit determines that the transmembrane pressure difference of the ceramic membrane filtration unit exceeds the set value, it issues a backwashing instruction to restore the performance of the ceramic membrane as soon as possible. The feedback control unit controls the reagent dosing device to add polyaluminium chloride. When the UV spectrophotometer detects an increase in UV254 data, it indicates that the organic matter index of the culture fluid has increased. When the pressure sensor detects an increase in the transmembrane pressure difference of the ceramic membrane filtration unit, the feedback control unit will be triggered to automatically control the addition of a specific filter aid, polyaluminium chloride, to improve the filtration performance of the culture fluid and maintain the stability of the membrane flux. When the dosage of polyaluminium chloride is controlled at 20 mg / L, the transmembrane pressure difference is reduced by more than 40%.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method according to claims 7-8.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the method of claims 7-8 is implemented.

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