A sewage treatment process based on targeted treatment of functional microorganisms

Abstract

The present invention relates to the field of water treatment technology, and in particular to a sewage treatment process based on targeted treatment of functional microorganisms. The process includes step S1, customizing a biofilm structure; step S2, biodegradation; step S3, analysis; and step S4, aeration and oxygenation. The present invention customizes the corresponding functional microbial strains according to the type of pollutants, and customizes the corresponding strains on the filler to form a microbial membrane structure. As the sewage contacts the microbial membrane structure, an oxygen consumption process is carried out. Since the strains with poor tolerance to characteristic pollutants will die, the strain community will change. If the pollutants are too many compared to the microorganisms, the dissolved oxygen will be consumed too quickly, and the microbial flora structure needs to be adjusted to improve. If the anaerobic microorganisms grow and reproduce rapidly, a large amount of dissolved oxygen will be consumed, or even the dissolved oxygen will be exhausted. At this time, aeration and oxygenation are required to improve the activity of microorganisms, so that the sewage can be purified and the sewage treatment efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a sewage treatment process based on targeted treatment of functional microorganisms. Background Art

[0002] The basic principle of traditional biological treatment of industrial wastewater is that in the process of microbial growth and reproduction, the organic matter in the wastewater is consumed, and the harmful substances in it are degraded and utilized, so as to finally purify the wastewater; according to the demand of microorganisms for oxygen, the traditional biological process can be divided into anaerobic process and aerobic process, among which the method of using aerobic organisms to degrade organic matter under sufficient oxygen conditions is called aerobic process; the method of using facultative anaerobic microorganisms and anaerobic microorganisms to degrade organic matter under anoxic and anaerobic conditions is called anaerobic process. Traditional biological methods are widely used in various sewage treatment systems due to their low operating cost, simple process operation and no secondary pollution. However, traditional biological methods have certain limitations in treating high-concentration industrial wastewater: the tolerance of characteristic pollutants is low, and pretreatment must be added, resulting in more process links and higher treatment costs; low treatment efficiency and long residence time, because the traditional biological method has a low organic load, resulting in a long residence time and a large area; poor impact tolerance, difficult to recover after impact, affecting production; therefore, there is an urgent need for an efficient biological technology for high-concentration industrial wastewater, so that the industrial wastewater treatment effect is stable, the effluent is stable, the operating cost is low, and the environmental protection problems that plague industrial enterprises are solved.

[0003] Chinese patent application publication number: CN113087125A, discloses an efficient sewage treatment process system and process method based on microorganisms, which includes a uniform spreading structure and an activated carbon component. The activated carbon component is installed in the middle of a sewage pool through a support rod. The uniform spreading structure arranged at the bottom of the sewage pool breathes air to the activated carbon component. The bubbles exhaled by the uniform spreading structure carry microorganisms to flush the activated carbon component, and the microorganisms are attached to the activated carbon component. It can be seen that the existing microbial targeted treatment technology has a large number of pollutants in the sewage, lacks customized microbial flora, and cannot monitor the sewage purification process in real time when the sewage contacts the microbial membrane structure, and replace the biofilm structure in time, resulting in low sewage treatment efficiency. Summary of the invention

[0004] To this end, the present invention provides a sewage treatment process based on targeted treatment of functional microorganisms to overcome the problem of low sewage treatment efficiency in the prior art due to the lack of optimized and customized biofilm structure to purify sewage.

[0005] To achieve the above-mentioned purpose, the present invention provides a sewage treatment process based on targeted treatment of functional microorganisms, comprising:

[0006] Sampling and testing are performed at each sampling point on the surface of raw water, characteristic pollution factors and raw water pollution intensity are determined according to the test results, and microbial membrane structures are matched according to the raw water pollution intensity and characteristic pollution factors;

[0007] The raw water is passed through a microbial membrane structure with targeted treatment function to perform sewage purification treatment;

[0008] Wherein, during the sewage purification process, the real-time dissolved oxygen concentration corresponding to the raw water is obtained in a preset monitoring period, and the real-time dissolved oxygen concentration is determined according to the standard dissolved oxygen concentration range. When the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration and the real-time consumption rate is greater than or equal to the standard consumption rate, the upper surface of the raw water is continuously photographed to obtain a continuous purification image, and the image grayscale change rate is obtained according to the continuous purification image;

[0009] Drawing a purification rate change curve according to the grayscale change rate of the image, and judging the change trend of the drawn purification rate change curve to determine whether the flocculation process of the suspended pollutants is completed to form primary purified water;

[0010] Wherein, when the purification rate change curve does not have a peak value and the real-time residence time is greater than or equal to the standard residence time, the raw water is switched to another input pipeline;

[0011] Aeration and oxygenation are performed, and the primary purified water is injected into the sludge aeration tank to obtain secondary purified water.

[0012] Furthermore, the dissolved oxygen concentration in the biological contact anaerobic tank is detected by a microbial sensor during a preset monitoring period to obtain a real-time dissolved oxygen concentration, and the real-time dissolved oxygen concentration is determined according to a standard dissolved oxygen concentration range.

[0013] If the real-time dissolved oxygen concentration is within the standard dissolved oxygen concentration range, the real-time consumption rate will be determined based on the standard consumption rate.

[0014] If the real-time dissolved oxygen concentration is not within the standard dissolved oxygen concentration range, the real-time dissolved oxygen concentration will be judged according to the first standard dissolved oxygen concentration and the second standard dissolved oxygen concentration to determine whether to correct the preset oxygen flow rate.

[0015] Furthermore, when the real-time dissolved oxygen concentration is not within the standard dissolved oxygen concentration range, the real-time dissolved oxygen concentration will be determined based on the first standard dissolved oxygen concentration and the second standard dissolved oxygen concentration.

[0016] If the real-time dissolved oxygen concentration is less than the first standard dissolved oxygen concentration, the preset oxygen flow rate is corrected to the corrected first oxygen flow rate;

[0017] If the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration, the real-time consumption rate will be determined according to the standard consumption rate to analyze the dissolved oxygen consumption;

[0018] Wherein, Qc1'=Qc×[1+(Cb1-Cs) / Cs], Qc1' is the corrected first oxygen flow rate, Qc is the preset oxygen flow rate, Cb1 is the first standard dissolved oxygen concentration, and Cs is the real-time dissolved oxygen concentration.

[0019] Furthermore, when the real-time dissolved oxygen concentration is within the standard dissolved oxygen concentration range, or the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration, the real-time consumption rate is calculated according to the real-time dissolved oxygen concentration and the initial dissolved oxygen concentration, and the real-time consumption rate is determined according to the standard consumption rate.

[0020] If the real-time consumption rate is less than the standard consumption rate, the preset oxygen flow rate is corrected to a corrected second oxygen flow rate;

[0021] If the real-time consumption rate is greater than or equal to the standard consumption rate, the grayscale change rate of the image will be obtained to analyze the sewage purification process.

[0022] Furthermore, when the real-time consumption rate is greater than or equal to the standard consumption rate, continuous photographs of the raw water surface taken at a preset acquisition interval during the monitoring period are obtained to obtain the continuous purification image, and the average grayscale value of each of the continuous purification images is obtained. A curve of the change of the average grayscale value over time is plotted with a preset acquisition time, and a linear fit is performed to obtain an average grayscale fitting curve, and the maximum slope of the average grayscale fitting curve is used as the image grayscale change rate.

[0023] Furthermore, the grayscale change rate of the image in each preset monitoring period is obtained, and a change curve of the grayscale change rate of each image over time is plotted as a purification rate change curve, and the change trend of the purification rate change curve is determined.

[0024] If a peak value appears in the purification rate change curve, it is determined that the flocculation process of the suspended pollutants is completed and the aeration and oxygenation process will be carried out;

[0025] If the purification rate variation curve does not show a peak value, the standard residence time is compared with the real-time residence time to determine whether to switch the input pipeline of the raw water.

[0026] Furthermore, when the purification rate change curve does not have a peak, the contact time between the sewage and the microbial membrane structure is obtained as the real-time residence time, and the standard residence time is compared with the real-time residence time.

[0027] If the real-time residence time is greater than or equal to the standard residence time, the input pipeline of the raw water is switched to another input pipeline, so that the raw water flows through another microbial membrane structure for sewage purification;

[0028] If the real-time residence time is less than the standard residence time, the input pipeline of the raw water is not switched.

[0029] Furthermore, the real-time refractive index difference detected at each sampling point of the raw water is obtained, and the real-time refractive index difference is determined according to the standard refractive index difference.

[0030] If the real-time refractive index difference is less than or equal to the standard refractive index difference, the corresponding sampling point will not be marked;

[0031] If the real-time refractive index difference is greater than the standard refractive index difference, the corresponding sampling point will be marked as a suspended pollutant site;

[0032] The percentage of the number of suspended pollutant sites to the total number of sampling points is obtained and recorded as the proportion of suspended colloidal pollutants.

[0033] Furthermore, the real-time chromaticity value of the raw water is obtained by a camera device, the chromaticity difference ratio is calculated according to the standard chromaticity value and the real-time chromaticity value, and the pollution intensity of the raw water is calculated according to the suspended colloidal pollutant ratio and the chromaticity difference ratio;

[0034] Among them, Qs=Ac+Ps, Ac=|Ab-As| / As, Qs is the raw water pollution intensity, Ac is the chromaticity difference ratio, As is the real-time chromaticity value, Ab is the standard chromaticity value, and Ps is the ratio of suspended colloidal pollutants.

[0035] Furthermore, characteristic pollution factors are obtained, corresponding bacterial species are selected from the microbial strain library, bacterial strain communities are constructed, each of the bacterial strain communities is colonized on each filler to form a number of the microbial membrane structures, and the standard residence time is calculated according to the raw water pollution intensity.

[0036] Compared with the prior art, the beneficial effect of the present invention lies in that, by determining the type of pollutants, the corresponding functional microbial strains are customized, the targeted functional engineering is carried out in a targeted manner, and after strengthening, the corresponding microbial strains are customized on the filler to form a targeted governance functional matrix, that is, a microbial membrane structure. As the sewage contacts the microbial membrane structure, an oxygen consumption process is carried out, that is, as the dissolved oxygen in the water body is consumed, the pollutants in the sewage are oxidized and degraded into stable inorganic substances, such as water, carbon dioxide, phosphate, etc. by the aerobic strains. In the oxygen consumption process, the strains that can decompose the pollutants reproduce and produce active ingredients to degrade the pollutants. However, due to the poor tolerance of characteristic pollutants, the strains will die, and the strain community may change. Moreover, if the pollutants are too many compared to the microorganisms, the dissolved oxygen will be consumed too quickly. It may be that the characteristic pollutants do not match the corresponding strain community, and the microbial flora structure needs to be adjusted for improvement. It may also be due to the rapid growth and reproduction of anaerobic microorganisms, which consume a large amount of dissolved oxygen, or even consume all the dissolved oxygen. At this time, aeration and oxygenation are required to improve the activity of microorganisms, purify the sewage, and improve the sewage treatment efficiency.

[0037] Furthermore, by real-time monitoring of the dissolved oxygen concentration in the raw water, the degree of microbial degradation of pollutants, that is, dynamic sewage purification, can be characterized. By setting a standard dissolved oxygen concentration range, sufficient oxygen supply can be guaranteed to enhance the vitality of microorganisms, promote their growth and metabolic activities, and contribute to the stable operation of the treatment system and sewage purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of a sewage treatment process based on targeted treatment of functional microorganisms according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the targeted treatment of sewage by functional microorganisms according to an embodiment of the present invention;

[0040] Figure 3 A logic decision diagram for determining the formation of primary purified water according to an embodiment of the present invention;

[0041] Figure 4 This is a logic decision diagram for allowing raw water to flow through another microbial membrane structure in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0044] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0045] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] See also Figure 1 and Figure 2 As shown, Figure 1 The following is a schematic diagram of a sewage treatment process based on targeted treatment of functional microorganisms according to an embodiment of the present invention. Figure 2 The present invention provides a sewage treatment process based on the targeted treatment of functional microorganisms, including raw water detection, targeted compounding of functional microorganisms, construction of a functional matrix and enhanced targeted treatment of microorganisms, wherein:

[0047] Step S1, sampling and testing each sampling point of raw water, determining the characteristic pollution factors and pollution intensity of raw water according to the test results, and targeting and compounding functional microbial flora according to the raw water pollution intensity and characteristic pollution factors to construct a biochemical functional matrix for raw water microbial targeted treatment, and forming a number of microbial membrane structures after targeted engineering enhancement;

[0048] Step S2, allowing the raw water to flow through a microbial membrane structure with targeted treatment function for sewage purification treatment at a standard residence time;

[0049] Wherein, during the sewage purification process, the real-time dissolved oxygen concentration corresponding to the raw water is obtained in a preset monitoring period, and the real-time dissolved oxygen concentration is determined according to the standard dissolved oxygen concentration range. When the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration and the real-time consumption rate is greater than or equal to the standard consumption rate, the upper surface of the raw water is continuously photographed to obtain a continuous purification image, and the image grayscale change rate is obtained according to the continuous purification image;

[0050] Step S3, drawing a purification rate change curve according to the grayscale change rate of the image, and judging the change trend of the drawn purification rate change curve to determine whether the flocculation process of the suspended pollutants is completed to form primary purified water;

[0051] Wherein, when the purification rate change curve does not have a peak value and the real-time residence time is greater than or equal to the standard residence time, the raw water is switched to another input pipeline;

[0052] Step S4, aeration and oxygenation, injecting the primary purified water into the sludge aeration tank to obtain secondary purified water.

[0053] In this embodiment, the types of pollutants are determined by detecting raw water, and corresponding functional microbial strains are customized to obtain targeted compound bacterial agents. The corresponding microbial strains are targeted and customized on the filler to form a microbial community, namely, a microbial membrane structure. The sewage purification treatment includes the flocculation and sedimentation process of suspended pollutants by microorganisms and the degradation of organic pollutants. By monitoring the sewage treatment process and verifying the process effect of functional microorganisms to optimize the process parameters, a microbial biochemical functional matrix is ​​obtained, and targeted treatment and efficient treatment of sewage by functional microorganisms are achieved.

[0054] As sewage comes into contact with the microbial membrane structure, an oxygen consumption process occurs, that is, as the dissolved oxygen in the water body is consumed, the pollutants in the sewage are oxidized and degraded into stable inorganic substances, such as water, carbon dioxide, phosphates, etc. by aerobic bacteria. During the oxygen consumption process, bacteria that can decompose pollutants reproduce and produce active ingredients to degrade pollutants. However, due to the death of bacteria with poor tolerance to characteristic pollutants, the bacterial community may change. Moreover, if there are too many pollutants compared to microorganisms, the dissolved oxygen will be consumed too quickly. It may be that the characteristic pollutants do not match the corresponding bacterial community. In this case, the microbial community structure needs to be adjusted for improvement. It may also be due to the rapid growth and reproduction of anaerobic microorganisms, which consume a large amount of dissolved oxygen or even consume all the dissolved oxygen. At this time, oxygenation is required in time to improve the activity of microorganisms, purify the sewage, and improve the efficiency of sewage treatment.

[0055] Specifically, the dissolved oxygen concentration in the biological contact anaerobic tank is detected by a microbial sensor during a preset monitoring period to obtain the real-time dissolved oxygen concentration, and the real-time dissolved oxygen concentration is determined according to the standard dissolved oxygen concentration range.

[0056] If the real-time dissolved oxygen concentration is within the standard dissolved oxygen concentration range, the real-time consumption rate will be determined based on the standard consumption rate;

[0057] If the real-time dissolved oxygen concentration is not within the standard dissolved oxygen concentration range, the real-time dissolved oxygen concentration will be judged according to the first standard dissolved oxygen concentration and the second standard dissolved oxygen concentration to determine whether to correct the preset oxygen flow rate.

[0058] The standard dissolved oxygen concentration range set in this embodiment is related to the temperature, pressure and salinity of the water body. The first standard dissolved oxygen concentration and the second standard dissolved oxygen concentration constitute the standard dissolved oxygen concentration range. The first standard dissolved oxygen concentration is generally set to 0.2 mg / L, and the second standard dissolved oxygen concentration is generally set to between 2 mg / L and 3 mg / L, and is selected according to the actual type of raw water.

[0059] Raw water contains organic pollutants in suspended colloid and dissolved states. With the participation of dissolved oxygen in water, aerobic microorganisms oxidize and degrade them into small inorganic molecules such as water and carbon dioxide. The change in the content of dissolved oxygen in water represents the intensity of purification of organic pollutants in water. Therefore, the dissolved oxygen concentration in raw water is monitored in real time to characterize the degree of microbial degradation of pollutants, that is, the degree of dynamic sewage purification. By setting a standard dissolved oxygen concentration range, sufficient oxygen supply is guaranteed to improve the vitality of microorganisms, promote their growth and metabolic activities, and contribute to the stable operation of the treatment system and the purification of sewage.

[0060] Specifically, when the real-time dissolved oxygen concentration is not within the standard dissolved oxygen concentration range, the real-time dissolved oxygen concentration will be determined based on the first standard dissolved oxygen concentration and the second standard dissolved oxygen concentration.

[0061] If the real-time dissolved oxygen concentration is less than the first standard dissolved oxygen concentration, the preset oxygen flow rate is corrected to the corrected first oxygen flow rate;

[0062] If the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration, the real-time consumption rate will be determined according to the standard consumption rate to analyze the dissolved oxygen consumption;

[0063] Wherein, Qc1'=Qc×[1+(Cb1-Cs) / Cs], Qc1' is the corrected first oxygen flow rate, Qc is the preset oxygen flow rate, Cb1 is the first standard dissolved oxygen concentration, and Cs is the real-time dissolved oxygen concentration.

[0064] The preset oxygen flow rate set in this embodiment is the oxygenation flow rate, which can be set to 50 liters per minute and can be selected according to the actual sewage type, flow rate, treatment requirements, and scale of the treatment system.

[0065] Specifically, when the real-time dissolved oxygen concentration is within the standard dissolved oxygen concentration range, or when the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration, the real-time consumption rate is calculated based on the real-time dissolved oxygen concentration and the initial dissolved oxygen concentration, and the real-time consumption rate is determined based on the standard consumption rate.

[0066] If the real-time consumption rate is less than the standard consumption rate, the preset oxygen flow rate is corrected to a corrected second oxygen flow rate;

[0067] If the real-time consumption rate is greater than or equal to the standard consumption rate, the grayscale change rate of the image will be obtained to analyze the sewage purification process;

[0068] The real-time consumption rate is the ratio of the absolute value of the difference between the real-time dissolved oxygen concentration and the initial dissolved oxygen concentration to the preset monitoring period, and the initial dissolved oxygen concentration is the real-time dissolved oxygen concentration corresponding to the previous monitoring period;

[0069] Qc2'=Qc×[1+(Vb-Vs) / Vs], Qc2' is the corrected second oxygen flow rate, Qc is the preset oxygen flow rate, Vb is the standard consumption rate, and Vs is the real-time consumption rate.

[0070] The standard consumption rate set in this embodiment represents the rate of change of dissolved oxygen concentration, which is affected by environmental pressure, water temperature, and water type, and is generally set between 0.1 mg / L-1.0 mg / L per hour, and is selected and adjusted according to actual conditions.

[0071] By analyzing the dissolved oxygen consumption rate of the water body under the state of high dissolved oxygen concentration, the purification effect of the water body can be analyzed in more detail. If the real-time consumption rate is determined to be less than the standard consumption rate, it means that the dissolved oxygen consumption rate is low. In this case, oxygen is added to the system to increase the dissolved oxygen in time to ensure the effect of microbial degradation of pollutants. If the real-time consumption rate is determined to be greater than or equal to the standard consumption rate, it means that the dissolved oxygen consumption rate is large, and the efficiency of microbial degradation of pollutants is high. When suspended matter flocculates and settles, the suspended matter will be gathered together to make it larger and settle. At this time, microorganisms need to consume a large amount of dissolved oxygen to carry out metabolic activities. Therefore, the microorganisms will increase the consumption of dissolved oxygen when the suspended matter flocculates and settles. In the case of rapid dissolved oxygen consumption, the macroscopic phenomenon produced by the flocculation and sedimentation of suspended matter is used to characterize the sewage purification effect. The method is simple and effective.

[0072] Specifically, when the real-time consumption rate is greater than or equal to the standard consumption rate, continuous photographs of the raw water surface taken at a preset acquisition interval during the monitoring period are obtained to obtain the continuous purification image, and the average grayscale value of each of the continuous purification images is obtained. A curve of the change of the average grayscale value over time is plotted with a preset acquisition time, and a linear fit is performed to obtain an average grayscale fitting curve, and the maximum slope of the average grayscale fitting curve is used as the image grayscale change rate.

[0073] The preset collection duration is set to 50 seconds; the preset collection interval is 10 seconds;

[0074] In this embodiment, the mean filtering method is used to filter the continuous purified images. The grayscale values ​​of all pixels on any image are added and then divided by the total number of pixels to obtain the average grayscale value of the corresponding continuous purified image. A linear fit of "average grayscale value-time" is performed every five frames of images, and the fitting curve with a correlation coefficient greater than 0.9 is taken, and the maximum slope is taken as the image grayscale change rate.

[0075] The correlation coefficient is the correlation between the data points and the fitted curve.

[0076] Due to the flocculation effect of microorganisms, suspended colloids will be condensed into larger particles and settle, and the clarity of the water body will increase, making it easier for light to pass through the water body, that is, the transmittance of the water body will increase. Therefore, by taking pictures of the water surface and analyzing the transmittance of the water body through grayscale values, the sewage treatment process can be analyzed according to the trend of grayscale value changes. If it is determined that a peak value appears in the purification rate change curve, it means that the flocculation process of suspended pollutants is completed and the water body becomes clear and transparent.

[0077] See also Figure 3 As shown, it is a logic decision diagram for determining the formation of primary purified water according to an embodiment of the present invention;

[0078] Specifically, the grayscale change rate of the image in each preset monitoring period is obtained, and a change curve of the grayscale change rate of each image over time is plotted as a purification rate change curve, and the change trend of the purification rate change curve is determined.

[0079] If a peak value appears in the purification rate change curve, it is determined that the flocculation process of the suspended pollutants is completed, primary purified water is formed, and the aeration and oxygenation process will be carried out;

[0080] If the purification rate variation curve does not show a peak value, the standard residence time is compared with the real-time residence time to determine whether to switch the input pipeline of the raw water.

[0081] The preset monitoring period set in this embodiment is 180 seconds to 600 seconds, and is selected or adjusted according to the needs of the actual purification process.

[0082] Through real-time monitoring data and trend analysis, the treatment method can be accurately adjusted to improve the efficiency and purification effect of sewage treatment. When it is determined that a peak appears in the purification rate change curve, it means that the image grayscale change rate of each preset monitoring period tends to be constant, and the sedimentation process is completed at this time. If it is determined that no peak appears in the purification rate change curve, it means that the image grayscale change rate of each preset monitoring period does not tend to be constant and is in the sedimentation process. The sedimentation process is determined by analyzing the time for microorganisms to degrade pollutants.

[0083] See also Figure 4 As shown, it is a logic decision diagram for making raw water flow through another microbial membrane structure in an embodiment of the present invention;

[0084] Specifically, a standard residence time is set, and when the purification rate change curve does not have a peak, the contact time between the sewage and the microbial membrane structure is obtained as the real-time residence time, and the standard residence time is compared with the real-time residence time.

[0085] If the real-time residence time is greater than or equal to the standard residence time, the input pipeline of the raw water is switched to another input pipeline, so that the raw water flows through another microbial membrane structure for sewage purification;

[0086] If the real-time retention time is less than the standard retention time, the input pipeline of the raw water is not switched;

[0087] When the dissolved oxygen is consumed quickly by microorganisms during the flocculation and sedimentation of suspended matter, the standard residence time is compared with the real-time residence time to analyze the real-time duration of microbial degradation of pollutants. If the real-time residence time is determined to be less than the standard residence time, indicating that the microorganisms have a shorter time to degrade pollutants, the image grayscale change rate of the next preset monitoring period is obtained for the above analysis until the real-time residence time is greater than or equal to the standard residence time. If it is still determined that the purification rate change curve has no peak, indicating that the microorganisms have a longer time to degrade pollutants and are still in the sedimentation process, indicating that the microbial structure has a low treatment efficiency for pollutants, then it is switched to another microbial membrane structure in time to quickly respond to changes in water quality and treatment needs to ensure the purification effect of the water body.

[0088] Specifically, the real-time refractive index difference detected at each sampling point of the raw water is obtained, and the real-time refractive index difference is determined according to the standard refractive index difference.

[0089] If the real-time refractive index difference is less than or equal to the standard refractive index difference, the corresponding sampling point will not be marked;

[0090] If the real-time refractive index difference is greater than the standard refractive index difference, the corresponding sampling point will be marked as a suspended pollutant site;

[0091] The percentage of the number of suspended pollutant sites to the total number of sampling points is obtained and recorded as the proportion of suspended colloidal pollutants.

[0092] The real-time refractive index difference of each sampling point is obtained. For any sampling point, the real-time refractive index difference is subtracted from the standard refractive index and then the absolute value is calculated to obtain the real-time refractive index difference.

[0093] The standard refractive index difference value set in this embodiment is related to the water body type and the colloidal properties of suspended matter. Generally, the standard refractive index difference value is set between 0.02-0.5. The standard refractive index is the refractive index through the water body. Preliminary experiments have shown that the refraction of light through sewage represents its transparency, and there is a large difference in the refractive index between impurities and water bodies. The standard refractive index can be 1.33, and the refractive index through impurities is between 1.35-2.00. Therefore, the standard refractive index difference value is set between 0.02-0.5 to simply judge the suspended colloidal impurities in the sewage. The selection of sampling points is affected by the flow of water bodies, the distribution of pollution sources, and the characteristics of water bodies, and it is only necessary to ensure that the overall water quality is represented.

[0094] By selecting multiple sampling points in the water body for sampling, since the raw water contains suspended colloids and dissolved pollutants, multiple sampling points are set to detect whether there are suspended colloids at the corresponding positions to analyze the distribution and content of suspended colloids in the raw water. The method is simple and effective.

[0095] Specifically, the real-time chromaticity value of the raw water is obtained through a camera device, the chromaticity difference ratio is calculated according to the standard chromaticity value and the real-time chromaticity value, and the pollution intensity of the raw water is calculated according to the suspended colloidal pollutant ratio and the chromaticity difference ratio;

[0096] Among them, Qs=Ac+Ps, Ac=|Ab-As| / As, Qs is the raw water pollution intensity, Ac is the chromaticity difference ratio, As is the real-time chromaticity value, Ab is the standard chromaticity value, and Ps is the ratio of suspended colloidal pollutants.

[0097] The standard chromaticity value set in this embodiment represents the grayscale value of the image when the water quality reaches the discharge standard, which is related to the environment and region. Generally, the standard chromaticity value is set between 0-50 and is selected and adjusted according to the local water quality standard requirements and equipment specifications.

[0098] Specifically, characteristic pollution factors are obtained, corresponding bacterial species are selected from the microbial strain library, several bacterial species communities that match them are constructed and domesticated into a targeted governance functional matrix, each of the bacterial species communities is colonized on each filler to form a number of microbial film structures, and the standard residence time is calculated according to the raw water pollution intensity.

[0099] Standard residence time = standard purification time × raw water pollution intensity.

[0100] In this embodiment, the standard purification time is generally set to 24 hours to 300 hours, and is adjusted according to the actual sewage treatment volume, sewage type, and purification needs.

[0101] Microbial strains designed to target specific pollutants have highly specialized treatment capabilities and help to effectively degrade target pollutants. By determining the type of pollutant and customizing the corresponding functional microbial strains, targeted functional engineering enhancements can be used to accurately treat different pollutants and improve treatment efficiency.

[0102] In this embodiment, the targeted treatment is to customize the compound bacterial agent in the bacterial library according to the characteristic pollutants in the chemical wastewater, and use a filler with a large specific surface area to provide space for the high-efficiency bacterial agent to survive, reproduce and exert its activity. The special bacterial agent is colonized on the filler to form a microbial community. When the sewage passes through the filler, the sewage contacts the biofilm, and the sewage is purified under the action of the microorganisms on the membrane. Figure 2 As shown in the figure, the inner and outer layers of the biofilm can provide anaerobic and aerobic environments respectively, so that pollutants in industrial wastewater are converted into small inorganic molecules such as CO2 and water, and bacteria convert NH3-N into NO3 - and NO2 - After denitrification, N2 is produced and overflows the water surface, and sulfur bacteria convert SO3 2- Converted to SO4 2- Anaerobic bacteria convert carbohydrates into methane, sulfates into sulfides, and organic nitrogen compounds into nitrates and ammonia nitrogen; microbial agents include sulfide bacteria, nitrite bacteria, nitrifying bacteria, anaerobic bacteria and complex bacteria that decompose organic matter.

[0103] In this embodiment, the standard purification time is optimized according to the raw water pollution intensity, so as to formulate a corresponding purification time by monitoring the water quality of the raw water and understanding the types and concentrations of pollutants. The more serious the raw water pollution is, the longer the required purification time will be. The microbial agents are matched according to the characteristic pollution factors. For example, for water sources with serious organic pollution, microbial agents containing aerobic bacteria or anaerobic bacteria are selected. For pollution containing inorganic substances such as nitrogen and phosphorus, microbial agents containing nitrifying bacteria, denitrifying bacteria and other species can be selected to remove nitrogen and phosphorus in a targeted manner.

[0104] Example 1, characteristic pollution factors include mixed cresols, p-cresol, xylenol, phenol, m-cresol, formaldehyde, oxalic acid, methanol, and ethylene glycol;

[0105] Matching microbial agents include Bacillus, denitrifying bacteria, nitrifying bacteria, cocci, and Pseudomonas;

[0106] Among them, Bacillus 20%, Nitrobacter 25%, Coccus 25%, Pseudomonas 30%;

[0107] It can also be 20% Bacillus, 25% denitrifying bacteria, 25% cocci, and 30% Pseudomonas;

[0108] The content percentage of each component is mass percentage;

[0109] Treatment effect: COD: 180-400 mg / L, phenol < 0 mg / L, formaldehyde < 0 mg / L.

[0110] The treatment effect data showed that the COD removal rate was above 98%, and the phenol and formaldehyde removal rates reached 100%. The influent COD concentration increased to about 25,000-37,000 mg / L, and the effluent COD concentration was also stable at 500 mg / L, indicating that the biochemical system has strong stability and impact resistance and is not affected by concentration fluctuations.

[0111] Example 2, characteristic pollution factors include ethylene oxide, propylene oxide, phosphorus oxychloride, epichlorohydrin, and ethyl chloride;

[0112] Matched microbial agents include Rhodococcus, Pseudomonas, denitrifying bacteria, and Bacillus;

[0113] Among them, Bacillus 40%, Dehalogenococcus 25%, and Rhodococcus 30%;

[0114] It can also be 40% for Pseudomonas, 25% for Dehalogenococcus, and 30% for Rhodococcus;

[0115] Treatment effect: COD 400mg / L;

[0116] Aiming at characteristic pollutants such as phenols, ethylene oxide, propylene oxide, epichlorohydrin, ethyl chloride and other characteristic pollution factors, the special biological aerobic technology of Tianjin Institute of Industrial Biology, Chinese Academy of Sciences, and customized bacterial agents are used for treatment. While improving the treatment efficiency, it also takes into account the economy and greatly gets rid of the dependence on Fenton and anaerobic process sections in traditional sewage treatment technology. The effluent meets the third-level emission standards in the "Comprehensive Sewage Discharge Standard" (GB8978-1996).

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

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

Claims

1. A sewage treatment process based on targeted treatment of functional microorganisms, characterized in that: include, Sampling and testing are performed at each sampling point of raw water, characteristic pollution factors and raw water pollution intensity are determined according to the test results, and microbial membrane structures are matched according to the raw water pollution intensity and characteristic pollution factors; Allowing the raw water to flow through a microbial membrane structure with targeted functions for sewage purification treatment; In the sewage purification process, the dissolved oxygen concentration in the biological contact anaerobic tank is detected by a microbial sensor during a preset monitoring period to obtain a real-time dissolved oxygen concentration, and the real-time dissolved oxygen concentration is determined according to a standard dissolved oxygen concentration range. If the real-time dissolved oxygen concentration is within the standard dissolved oxygen concentration range, the real-time consumption rate will be determined based on the standard consumption rate; If the real-time dissolved oxygen concentration is not within the standard dissolved oxygen concentration range, the real-time dissolved oxygen concentration will be judged according to the first standard dissolved oxygen concentration and the second standard dissolved oxygen concentration to determine whether to correct the preset oxygen flow rate; If the real-time dissolved oxygen concentration is less than the first standard dissolved oxygen concentration, the preset oxygen flow rate is corrected to the corrected first oxygen flow rate; If the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration, the real-time consumption rate will be determined according to the standard consumption rate to analyze the dissolved oxygen consumption; Wherein, Qc1'=Qc×[1+(Cb1-Cs) / Cs], Qc1' is the corrected first oxygen flow rate, Qc is the preset oxygen flow rate, Cb1 is the first standard dissolved oxygen concentration, and Cs is the real-time dissolved oxygen concentration; When the real-time dissolved oxygen concentration is within the standard dissolved oxygen concentration range, or the real-time dissolved oxygen concentration is greater than the second standard dissolved oxygen concentration, the real-time consumption rate is calculated based on the real-time dissolved oxygen concentration and the initial dissolved oxygen concentration, and the real-time consumption rate is determined based on the standard consumption rate. If the real-time consumption rate is less than the standard consumption rate, the preset oxygen flow rate is corrected to a corrected second oxygen flow rate; If the real-time consumption rate is greater than or equal to the standard consumption rate, continuously take photos of the upper surface of the raw water to obtain a continuous purification image, obtain the image grayscale change rate according to the continuous purification image, obtain the image grayscale change rate of each preset monitoring period, draw a change curve of each image grayscale change rate over time as a purification rate change curve, and judge the change trend of the purification rate change curve to determine whether the flocculation process of the suspended pollutants is completed to form a primary purified water; If a peak value appears in the purification rate change curve, it is determined that the flocculation process of the suspended pollutants is completed and the aeration and oxygenation process will be carried out; If the purification rate change curve does not have a peak value, when the purification rate change curve does not have a peak value, the contact time between the sewage and the microbial membrane structure is obtained as the real-time residence time, and the standard residence time is compared with the real-time residence time to determine whether to switch the input pipeline of the raw water; Wherein, when the real-time residence time is greater than or equal to the standard residence time, the raw water is switched to another input pipeline; the real-time consumption rate is the ratio of the absolute value of the difference between the real-time dissolved oxygen concentration and the initial dissolved oxygen concentration to the preset monitoring period, and the initial dissolved oxygen concentration is the real-time dissolved oxygen concentration corresponding to the previous monitoring period; Qc2'=Qc×[1+(Vb-Vs) / Vs], Qc2' is the corrected second oxygen flow rate, Qc is the preset oxygen flow rate, Vb is the standard consumption rate, and Vs is the real-time consumption rate; Aeration and oxygenation are performed, and the primary purified water is injected into the sludge aeration tank to obtain secondary purified water.

2. The sewage treatment process based on targeted treatment of functional microorganisms according to claim 1 is characterized in that: When the real-time consumption rate is greater than or equal to the standard consumption rate, continuous photographs of the raw water surface taken at a preset acquisition interval during the monitoring period are obtained to obtain the continuous purification image, and the average grayscale value of each of the continuous purification images is obtained. A curve of the change of the average grayscale value over time is plotted with a preset acquisition time, and a linear fit is performed to obtain an average grayscale fitting curve, and the maximum slope of the average grayscale fitting curve is used as the image grayscale change rate.

3. The sewage treatment process based on targeted treatment of functional microorganisms according to claim 1 is characterized in that: A standard residence time is set. When the purification rate change curve does not show a peak, the contact time between the sewage and the microbial membrane structure is obtained as the real-time residence time. The standard residence time is compared with the real-time residence time. If the real-time residence time is greater than or equal to the standard residence time, the input pipeline of the raw water is switched to another input pipeline, so that the raw water flows through another microbial membrane structure for sewage purification; If the real-time residence time is less than the standard residence time, the input pipeline of the raw water is not switched.

4. The sewage treatment process based on targeted treatment of functional microorganisms according to claim 1 is characterized in that: Obtain the real-time refractive index difference detected at each sampling point of the raw water, and determine the real-time refractive index difference according to the standard refractive index difference. If the real-time refractive index difference is less than or equal to the standard refractive index difference, the corresponding sampling point will not be marked; If the real-time refractive index difference is greater than the standard refractive index difference, the corresponding sampling point will be marked as a suspended pollutant site; Among them, the percentage of the number of suspended pollutant sites to the total number of sampling points is recorded as the proportion of suspended colloidal pollutants.

5. The sewage treatment process based on targeted treatment of functional microorganisms according to claim 4 is characterized in that: The real-time chromaticity value of the raw water is obtained by a camera device, the chromaticity difference ratio is calculated according to the standard chromaticity value and the real-time chromaticity value, and the pollution intensity of the raw water is calculated according to the suspended colloidal pollutant ratio and the chromaticity difference ratio; Among them, Qs=Ac+Ps, Ac=|Ab-As| / As, Qs is the raw water pollution intensity, Ac is the chromaticity difference ratio, As is the real-time chromaticity value, Ab is the standard chromaticity value, and Ps is the ratio of suspended colloidal pollutants.

6. The sewage treatment process based on targeted treatment of functional microorganisms according to claim 5 is characterized in that: Acquire characteristic pollution factors, select corresponding bacterial species in the microbial strain library, construct several bacterial species communities, colonize each of the bacterial species communities on each filler to form several of the microbial membrane structures, and calculate the standard residence time according to the raw water pollution intensity.

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