Sequencing batch activated sludge method for removing phosphorus in cooling circulating water of power plant by taking ammonia nitrogen as nitrogen source

Abstract

The invention discloses a sequencing batch activated sludge method for removing phosphorus in cooling circulating water of a power plant by taking ammonia nitrogen as a nitrogen source, and belongs to the technical field of water treatment. When ammonia nitrogen is used as a nitrogen source and nitrate nitrogen is used as a nitrogen source to directly remove phosphorus from the circulating cooling water of the power plant, the phosphorus removal effect is poor, and the inlet water quality and the operation mode of the reactor need to be adjusted to a certain degree to improve the phosphorus removal effect. Therefore, the optimal water inlet condition and the reactor operation condition during the operation of the two processes are explored by simulating the circulating cooling water, so that the phosphorus removal effect of the reactor on the circulating cooling water of the power plant is improved and contrastive analysis is carried out; after the phosphorus removal effect reaches the standard, the water inlet condition and the operation mode of the reactor are adjusted, so that the operation and maintenance cost of the reactor is reduced on the premise that the effluent TP meets the requirement.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a sequencing batch activated sludge process for removing phosphorus in cooling circulating water of a power plant by using ammonia nitrogen as a nitrogen source. Background Art

[0002] The water quality targeted in the current experimental research is domestic sewage, which has a low salt content, sufficient nutrients, and a high ammonia nitrogen content. However, the phosphorus removal effect and phosphorus removal characteristics of this process in thermal power plant circulating cooling water, which has high salt, high alkalinity, scarce nutrients, almost no ammonia nitrogen, and high nitrate content, are still unknown. There are also few reports on the phosphorus removal characteristics of the reactor when nitrate nitrogen is used as the nitrogen source. The phosphorus removal technology for circulating cooling water is still a blank in the field of industrial wastewater. At this stage, there are few reports on the use of biological methods to remove phosphorus from such water.

[0003] Biological phosphorus removal has the advantages of low energy consumption, low operating costs, and small sludge production. At the same time, biological phosphorus removal also has the following disadvantages: high infrastructure costs; high requirements for water quality stability and nutrient content; and greater impact of toxic and harmful substances in the water.

[0004] Based on the above problems, the treatment method of cooling circulating water in power plants needs to be improved. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] Applying the single-stage aerobic phosphorus removal process with ammonia nitrogen as the nitrogen source and nitrate nitrogen as the nitrogen source to this type of water quality and exploring its phosphorus removal characteristics can enrich the research in this field. The present invention will enrich the relevant research in this field and provide a reference for subsequent exploration.

[0007] This method uses an existing biological pool with a volume of about 1 / 200 of the circulating water pool, so it is small and acceptable compared to the overall construction cost of the project. Since the supplementary water is natural surface water or tap water, the water quality is stable. Since the influent water quality is stable and the content of toxic and harmful substances is low, it is suitable for the reproduction of microorganisms.

[0008] The sequencing batch activated sludge process with ammonia nitrogen as the nitrogen source solves the following problems: 1. Apply the single-stage aerobic phosphorus removal process with ammonia nitrogen as the nitrogen source to the circulating cooling water of thermal power plants, which has high salt, high alkalinity, scarce nutrients, almost no ammonia nitrogen, and high nitrate content, and explore its phosphorus removal characteristics. 2. A few years ago, the phosphorus removal technology for circulating cooling water was still a blank in the field of industrial wastewater. At present, there are few reports on the use of biological methods to remove phosphorus from such water.

[0009] In summary, the demand for biological phosphorus removal technology can be basically met, and the use of microbial phosphorus removal has certain operability. Microbial phosphorus removal will consume nutrients in the water, inhibit the growth of microorganisms in cooling water, reduce the concentration of microorganisms in circulating cooling water, and reduce the corrosion caused by microorganisms. The single-stage aerobic SBR phosphorus removal process is a phosphorus removal process that does not require an anaerobic stage. It has the advantages of good phosphorus removal effect, simple operation, and less impact of nitrates.

[0010] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0011] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source.

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions, including:

[0013] According to the characteristics and treatment requirements of cooling circulating water in power plants, microbial strains with high phosphorus removal capabilities are selected, and the selected strains are purified and amplified;

[0014] Monitor the water quality of circulating cooling water, evaluate the current water quality and make water quality adjustments based on the monitoring results;

[0015] Select the dosing point according to the layout and process of the circulating cooling water system of the power plant; calculate the required amount of bacteria to be added according to the water quality monitoring results and the characteristics of the bacteria; run the SBR reactor after adding the bacteria;

[0016] The phosphorus in the cooling water is absorbed by the bacteria and condensed into bacterial agglomerates, which are then transported to the solid waste disposal center for unified treatment, thereby reducing the phosphorus content in the cooling water and achieving the purpose of recycling the water in the bacterial agglomerates.

[0017] As a preferred embodiment of the sequencing batch activated sludge method for removing phosphorus in cooling circulating water of power plants using ammonia nitrogen as a nitrogen source, the microbial strains include one or more of polyphosphate-accumulating bacteria, Acinetobacter, HS-P2 bacteria, Tetracoccus, Bacillus, and Aeromonas.

[0018] As a preferred embodiment of the sequencing batch activated sludge process for removing phosphorus from cooling circulating water of power plants using ammonia nitrogen as a nitrogen source, the highly efficient phosphorus removal capability is to effectively remove phosphorus under anaerobic and aerobic conditions.

[0019] As a preferred embodiment of the sequencing batch activated sludge method for removing phosphorus from cooling circulating water of a power plant using ammonia nitrogen as a nitrogen source according to the present invention, the screening means includes high-throughput sequencing.

[0020] As a preferred scheme of the sequencing batch activated sludge method for removing phosphorus in cooling circulating water of power plants using ammonia nitrogen as a nitrogen source as described in the present invention, the culture conditions are controlled during the amplification process, wherein the culture conditions include temperature, pH value, and dissolved oxygen.

[0021] As a preferred scheme of the sequencing batch activated sludge method for removing phosphorus from cooling circulating water of a power plant using ammonia nitrogen as a nitrogen source, the water quality monitoring indicators include phosphorus content, BOD / TP ratio, pH value, and dissolved oxygen.

[0022] As a preferred scheme of the sequencing batch activated sludge method for removing phosphorus from cooling circulating water of a power plant using ammonia nitrogen as a nitrogen source according to the present invention, the water quality adjustment includes adding an acid-base regulator and increasing the aeration amount.

[0023] As a preferred scheme of the sequencing batch activated sludge method for removing phosphorus in the cooling circulating water of a power plant using ammonia nitrogen as the nitrogen source described in the present invention, the adding method of the bacterial strain includes continuous adding, impact adding, alternating adding, regular adding, and adding based on the operating cycle of the SBR reactor.

[0024] As a preferred scheme of the sequencing batch activated sludge method for removing phosphorus in power plant cooling circulating water using ammonia nitrogen as a nitrogen source described in the present invention, the addition point is located in an area that is easy to mix and react to ensure that the bacteria can fully contact with the phosphorus in the water.

[0025] As a preferred scheme of the sequencing batch activated sludge method for removing phosphorus in cooling circulating water of power plants using ammonia nitrogen as a nitrogen source, the dosage of the added bacteria is dynamically adjusted according to the activity of the microorganisms and the sludge yield.

[0026] Beneficial effects of the present invention:

[0027] (1) For the single-stage aerobic SBR reactor with ammonia nitrogen as the nitrogen source, the optimal influent COD is 300 mg / L, the optimal influent pH is 8.5, the optimal reaction temperature is 25℃, the optimal sludge retention time is 10 days, and the optimal carbon source is glucose. The average phosphorus removal rate of the reactor can reach more than 98%, and the TP content of the effluent is less than 0.05 mg / L, which can meet the power plant's requirement of effluent TP less than 0.5 mg / L after treatment; the average COD removal rate can reach more than 92.5%, and the average effluent COD is less than 15 mg / L, which can meet the power plant's requirement of not increasing the COD concentration in the cooling circulation system after additional carbon source addition; ammonia nitrogen and nitrite nitrogen can be almost completely removed, and the average removal rates of TN and nitrate nitrogen can reach more than 55%; the average effluent pH of the reactor is above 8.45, which is consistent with the actual circulating cooling water pH.

[0028] (2) When the process uses ammonia nitrogen as the nitrogen source and nitrate nitrogen as the nitrogen source to directly remove phosphorus from the circulating cooling water of the power plant, the phosphorus removal effect is poor, and the inlet water quality and the reactor operation mode need to be adjusted to improve the phosphorus removal effect. Therefore, it is necessary to explore the optimal inlet water conditions and reactor operation conditions when the two processes are running by simulating circulating cooling water to improve the reactor's phosphorus removal effect on the circulating cooling water of the power plant and conduct a comparative analysis; after the phosphorus removal effect reaches the standard, adjust the reactor's inlet water conditions and operation mode to reduce the reactor operation and maintenance costs while the effluent TP meets the demand.

[0029] (3) The two processes were used to treat actual power plant circulating cooling water, and the main indicators and removal efficiency of related pollutants were measured to explore whether this method can meet the phosphorus removal requirements and whether it will lead to increased levels of pollutants such as COD, ammonia nitrogen, nitrate, and nitrite, which are of key concern to power plants.

[0030] (4) Perform high-throughput sequencing of the microorganisms to identify the dominant bacterial community in the reactor, and use the results to analyze the types and contents of functional microorganisms. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] The raw materials used in the present invention are all commercially available unless otherwise specified.

[0035] Example 1

[0036] This embodiment provides a sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source, specifically:

[0037] This example is carried out in an SBR sequencing batch reactor, and the effective volume of each reactor is 1.8 L. The specific operation mode of this experiment is set as follows: instantaneous water inlet → aeration for 4 h → sedimentation for 0.5 h → instantaneous water outlet → idle for 7.5 h, that is, the operation time of one cycle is 12 h, 2 cycles are run per day, and 1 L of water is inlet in each cycle.

[0038] Influent: The present invention uses power plant water as a reference, and the initial sludge concentration is set to 1000 mg / L; glucose is used as the single carbon source; ammonium chloride is used as the nitrogen source, NH 4+ The concentration is 20 mg / L. Since no other nitrogen sources are added, the total nitrogen and ammonia nitrogen concentrations in the influent are the same. Potassium dihydrogen phosphate is added to supplement phosphorus to the same level as the target water (TP = 1.8 mg / L). The influent pH is synchronized with the electric field water and maintained at around 8.75. The temperature is controlled at 25°C by a thermostat. KH2PO4-P (12 mg / L ) ; NH4Cl-N(30mg / L ) ;Mg SO4(5mg / L ) ;CaCl2(5mg / L ) ; Trace elements ( 0.5m L ) .

[0039] Example 2

[0040] The difference between this embodiment and embodiment 1 is that the COD concentration in the reactor is adjusted to 100 mg / L, and the remaining processes are the same as those in embodiment 1, treating the circulating cooling water.

[0041] Example 3

[0042] The difference between this embodiment and embodiment 1 is that the COD concentration in the reactor is adjusted to 200 mg / L, and the remaining processes are the same as those in embodiment 1, treating the circulating cooling water.

[0043] Example 4

[0044] The difference between this embodiment and embodiment 1 is that the COD concentration in the reactor is adjusted to 400 mg / L, and the remaining processes are the same as those in embodiment 1, treating the circulating cooling water.

[0045] Example 5

[0046] The difference between this embodiment and embodiment 1 is that the COD concentration in the reactor is adjusted to 500 mg / L, and the remaining processes are the same as those in embodiment 1, treating the circulating cooling water.

[0047] The water output of the method shown in the above embodiment was tested for its effect, and the comparison results with those of Example 1 are shown in Table 1.

[0048] Table 1

[0049] Example 1 Example 2 Example 3 Example 4 Example 5 Influent COD concentration (mg / L) 300 100 200 400 500 Phosphorus removal rate (%) 90.64 22.37 87.67 84.31 57.96 TP content (mg / L) 0.17 1.40 0.22 0.28 0.76 Average COD removal rate (%) 92.23 91.08 92.02 94.72 95.02 Average TN removal rate (%) 55.86 38.78 54.65 59.80 63.00

[0050] As can be seen from the above table, the COD concentration in the reactor is adjusted to have a significant effect on the phosphorus removal effect of the method of the present invention. This is because the change in the concentration of nutrients will cause a change in the nutritional ratio, forming competition for nutrient sources between different types of microorganisms, inducing different dominant microbial types in activated sludge, and affecting its growth and reproduction, thereby affecting the biological treatment effect of wastewater. When the influent COD concentration is insufficient, because there is no sufficient PHA in the aerobic stage to supplement the amount of glycogen in the microorganism, polyphosphate bacteria will be washed out of the system. However, when the COD concentration in the reactor is too high, heterotrophic bacteria such as denitrifying bacteria will occupy a dominant position in the competition with polyphosphate bacteria (PAO) for organic nutrients, thereby affecting the phosphorus removal effect of the reactor. According to the results in the above table, the best technical effect can be obtained when the COD concentration in the present invention is 300mg / L.

[0051] Example 6

[0052] The difference between this embodiment and embodiment 1 is that the pH of the influent water is adjusted to 6.5, and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0053] Example 7

[0054] The difference between this embodiment and embodiment 1 is that the pH of the influent water is adjusted to 7.5, and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0055] Example 8

[0056] The difference between this embodiment and embodiment 1 is that the pH of the influent water is adjusted to 9.0, and the rest of the processes are the same as those in embodiment 1, treating the circulating cooling water.

[0057] Example 9

[0058] The difference between this embodiment and embodiment 1 is that the pH of the influent water is adjusted to 9.5, and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0059] The phosphorus removal effect of the method shown in the above embodiment was tested, and the comparison results with Example 1 are shown in Table 2.

[0060] Table 2

[0061] Example 1 Example 6 Example 7 Example 8 Example 9 pH 8.5 6.5 7.5 9.0 9.5 Phosphorus removal rate (%) 96.96 89.54 90.70 89.88 71.56 TP content (mg / L) 0.03 0.19 0.11 0.18 0.51 Average COD removal rate (%) 92.95 91.49 93.82 89.65 84.48 Average TN removal rate (%) 57.29 49.25 59.09 52.63 47.73

[0062] As can be seen from the table above, adjusting the pH of the influent has a significant effect on the phosphorus removal effect of the method of the present invention, because the change in the pH value of the influent will have a huge impact on the activity and metabolism of the relevant functional bacteria. According to the results in the table above, the best technical effect can be obtained when the pH of the influent is 8.5.

[0063] Example 10

[0064] The difference between this embodiment and embodiment 1 is that the inlet water temperature is adjusted to 15° C., and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0065] Embodiment 11

[0066] The difference between this embodiment and embodiment 1 is that the inlet water temperature is adjusted to 20° C., and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0067] Example 12

[0068] The difference between this embodiment and embodiment 1 is that the inlet water temperature is adjusted to 30° C., and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0069] The phosphorus removal effect of the method shown in the above embodiment was tested, and the comparison results with Example 1 are shown in Table 3.

[0070] Table 3

[0071] Example 1 Example 10 Embodiment 11 Example 12 Temperature(℃) 25 15 20 30 Phosphorus removal rate (%) 90.83 50.62 68.39 98.07 TP content (mg / L) 0.17 0.89 0.57 0.03 Average COD removal rate (%) 92.36 83.88 90.31 93.14 Average TN removal rate (%) 71.24 77.34 72.04 57.00

[0072] As can be seen from the above table, adjusting the temperature of the inlet water has a significant effect on the phosphorus removal effect of the method of the present invention. This is because the adaptability of polyphosphate bacteria to temperature is weak, and the suitable temperature range is small. The temperature mainly affects the phosphorus removal ability of the microorganisms in the reactor by affecting the sedimentation performance of the activated sludge in the reactor, the metabolic capacity of the microorganisms, and the colony structure in the reactor (for example, by affecting the growth rate of certain opposing bacteria, inhibiting the growth rate of polyphosphate microorganisms, etc., affecting the colony structure of the reactor), thereby affecting the treatment effect of the reactor. According to the results in the above table, the best technical effect can be obtained when the inlet water temperature in the present invention is 25°C.

[0073] Example 13

[0074] The difference between this embodiment and embodiment 1 is that the sludge retention time is adjusted to 15 days, and the rest of the processes are the same as those in embodiment 1, treating circulating cooling water.

[0075] Embodiment 14

[0076] The difference between this embodiment and embodiment 1 is that the sludge retention time is adjusted to 30 days, and the remaining processes are the same as those in embodiment 1, treating circulating cooling water.

[0077] The phosphorus removal effect of the method shown in the above embodiment was tested, and the comparison results with Example 1 are shown in Table 4.

[0078] Table 4

[0079]

[0080]

[0081] As can be seen from the above table, adjusting the sludge retention time has a significant effect on the phosphorus removal effect of the method of the present invention. This is because a lower sludge retention time will allow more phosphorus to be discharged from the system, but it will also cause the daily growth rate of microorganisms to be not equivalent to the amount of microorganisms discharged daily, thereby causing the system effluent to deteriorate. In addition, a lower sludge retention time will also increase the sludge treatment cost; a higher sludge retention time can increase the relative number of polyphosphate microorganisms in the reactor, but it may also cause the sedimentation performance of the sludge to decrease, causing the reactor effluent to deteriorate. According to the results in the above table, the best technical effect can be obtained when the sludge retention time in the present invention is 10d.

[0082] Embodiment 15

[0083] The difference between this embodiment and embodiment 1 is that the type of carbon source is adjusted to methanol, and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0084] Example 16

[0085] The difference between this embodiment and embodiment 1 is that the type of carbon source is adjusted to ethanol, and the rest of the processes are the same as those in embodiment 1, and the circulating cooling water is treated.

[0086] The phosphorus removal effect of the method shown in the above embodiment was tested, and the comparison results with Example 1 are shown in Table 5.

[0087] Table 5

[0088] Example 1 Embodiment 15 Example 16 Carbon source type glucose Methanol Ethanol Phosphorus removal rate (%) 50.10 45.54 47.26 TP content (mg / L) 0.90 0.98 0.95 Average COD removal rate (%) 93.84 87.60 98.44 Average TN removal rate (%) 44.99 69.19 51.40

[0089] As can be seen from the above table, adjusting the type of carbon source has a significant effect on the phosphorus removal effect of the method of the present invention. This is because when the nutrient content in the water is low, it is difficult for the reactor to fully exert its phosphorus removal effect. At this time, it is necessary to add additional carbon sources to the water to supplement energy for the phosphorus removal activities of microorganisms. Due to the different carbon sources in the water, different types of microorganisms will be induced to occupy a dominant position in the reactor, resulting in different phosphorus removal capabilities of the system. The different types of organic carbon sources added may bring about great differences in the phosphorus removal effect of the reactor. According to the results in the above table, the best technical effect can be obtained when the carbon source type in the present invention is glucose.

[0090] Comparative Example 1

[0091] Segmented influent SBR process: The removal of total phosphorus in sewage is mainly achieved by polyphosphate bacteria consuming organic matter to obtain energy and release phosphorus in the anaerobic stage, absorbing phosphorus in sewage in the aeration stage, and finally through sludge discharge. The mass concentration of phosphorus decreased after the first aeration. When the reaction environment gradually changed from aerobic to anoxic, the denitrifying bacteria competed with polyphosphate bacteria for carbon sources, resulting in less phosphorus release. In the anaerobic stage, on the one hand, the secondary influent increased the carbon source, and on the other hand, the removal of nitrate nitrogen avoided adverse effects on the release of phosphorus by polyphosphate bacteria, so the mass concentration of total phosphorus increased sharply and reached a peak. Subsequently, aerobic aeration shortened the process of phosphorus removal, polyphosphate bacteria absorbed a large amount of phosphorus, and the mass concentration of phosphorus in sewage was greatly reduced. In general, the general trends of the three working conditions are consistent, but the phosphorus release is the largest when the anaerobic stage time is 2h, the phosphorus absorption is the largest when the aeration time is 6h, and the removal effect is the best. Therefore, the optimal effective operation time of the anoxic stage is 2h and the aeration time is 6h.

[0092] Comparative Example 2

[0093] DPR process: A laboratory-scale organic glass SBR reactor is used. The reactor is equipped with mechanical stirring and aeration devices. The aeration intensity is controlled by a gas flow meter and the temperature is controlled at (23±2)℃. The reactor runs 3 cycles a day, with water inflow for 10 minutes, sedimentation for 30 minutes, drainage for 10 minutes, and idle for the rest of the time. The reactor runs for a total of 6 stages. The S1 stage uses the anaerobic / aerobic (A / O) mode to restore sludge activity and enrich PAOs. The aeration in the aerobic stage is controlled by a gas flow meter to control the DO concentration at about 2mg / L; the S2~S6 stages use the anaerobic / anoxic / aerobic (A / A / O) mode to enrich DPAOs.

[0094] The phosphorus removal effect of the method shown in the above comparative example was tested, and the comparison results with Example 1 are shown in Table 6.

[0095] Table 6

[0096] Example 1 Comparative Example 1 Comparative Example 2 Phosphorus removal rate (%) 90.64 83.69 84.6

[0097] As can be seen from the above table, for the single-stage aerobic SBR reactor with ammonia nitrogen as the nitrogen source, the optimum influent COD is 300 mg / L, the optimum influent pH is 8.5, the optimum reaction temperature is 25°C, the optimum sludge retention time is 10 days, and the optimum carbon source is glucose. The average phosphorus removal rate of the reactor can reach more than 98%, and the TP content of the effluent is less than 0.05 mg / L, which can meet the power plant's demand for effluent TP less than 0.5 mg / L after treatment; the average COD removal rate can reach more than 92.5%, and the average effluent COD is less than 15 mg / L, which can meet the power plant's requirement that the COD concentration in the cooling circulation system will not increase after the additional addition of carbon source; ammonia nitrogen and nitrite nitrogen can be almost completely removed, and the average removal rates of TN and nitrate nitrogen can reach more than 55%; the average effluent pH of the reactor is above 8.45, which is consistent with the actual circulating cooling water pH.

[0098] In summary, when the present invention uses ammonia nitrogen as a nitrogen source and nitrate nitrogen as a nitrogen source to directly remove phosphorus from the circulating cooling water of a power plant, the phosphorus removal effect is poor, and it is necessary to make certain adjustments to the inlet water quality and the reactor operation mode to improve the phosphorus removal effect. Therefore, it is necessary to explore the optimal inlet water conditions and reactor operation conditions when the two processes are running by simulating circulating cooling water to improve the phosphorus removal effect of the reactor on the circulating cooling water of the power plant and conduct a comparative analysis; after the phosphorus removal effect reaches the standard, adjust the reactor inlet water conditions and operation mode to reduce the reactor operation and maintenance costs on the premise that the effluent TP meets the demand.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source, characterized in that: include, According to the characteristics and treatment requirements of cooling circulating water in power plants, microbial strains with high phosphorus removal capabilities are screened, and the selected strains are purified and amplified; Monitor the water quality of circulating cooling water, evaluate the current water quality and make water quality adjustments based on the monitoring results; Select the dosing point according to the layout and process of the circulating cooling water system of the power plant; calculate the required amount of bacteria to be added according to the water quality monitoring results and the characteristics of the bacteria; run the SBR reactor after adding the bacteria; The phosphorus in the cooling water is absorbed by the bacteria and condensed into bacterial agglomerates, which are then transported to the solid waste disposal center for unified treatment, thereby reducing the phosphorus content in the cooling water and achieving the purpose of recycling the water in the bacterial agglomerates.

2. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: The microbial strains include one or more of polyphosphate bacteria, Acinetobacter, HS-P2 bacteria, Tetracoccus, Bacillus, and Aeromonas.

3. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: The screening method for the microbial strains includes high-throughput sequencing.

4. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in any one of claims 1 to 3, characterized in that: The highly efficient phosphorus removal capability refers to the effective removal of phosphorus under anaerobic and aerobic conditions.

5. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: During the amplification process, the culture conditions are controlled, wherein the culture conditions include temperature, pH value, and dissolved oxygen.

6. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: The water quality monitoring indicators include phosphorus content, BOD / TP ratio, pH value, and dissolved oxygen.

7. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: The water quality adjustment includes adding acid-base regulator and increasing aeration volume.

8. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: The adding methods of the bacterial strains include continuous adding, impact adding, alternating adding, regular adding, and adding based on the operation cycle of the SBR reactor.

9. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1 or 8, characterized in that: The dosing point is located in an area that is easy to mix and react to ensure that the bacteria can fully contact with the phosphorus in the water.

10. The sequencing batch activated sludge process for removing phosphorus from cooling circulating water in a power plant using ammonia nitrogen as a nitrogen source as claimed in claim 1, characterized in that: The dosage of the added bacteria is dynamically adjusted according to the activity of the microorganisms and the output of the sludge.

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