Anaerobic scale inhibitor and preparation method thereof

Abstract

The invention discloses an anaerobic scale inhibitor and a preparation method thereof, and belongs to the technical field of chemistry and chemical engineering, the anaerobic scale inhibitor can inhibit scale generation through chelation solubilization, lattice distortion and electrostatic repulsion, sludge activity is enhanced, corrosion to equipment is reduced, and scaling and blocking phenomena of the equipment are reduced, so that equipment maintenance is reduced, and the service life of the equipment is prolonged. The facility maintenance period of the anaerobic sewage treatment system is prolonged, the operation cost is reduced, and the stability and safety of system operation are improved. SAS and HPMA which are relatively low in price are mixed with HEDP or PBTCA for use, so that the cost of the scale inhibitor is effectively reduced, and the operation cost of a sewage treatment plant is reduced. Meanwhile, the combination of SAS and HPMA is mixed with HEDP or PBTCA for use, so that a better scale inhibition effect is achieved, the concentration of calcium and magnesium ions can be effectively reduced, and the retention rate of calcium and magnesium ions is improved, thereby inhibiting the formation of scale, improving the operation efficiency of an anaerobic reactor, prolonging the service life of equipment, improving the sewage treatment efficiency and improving the system stability, and having environmental protection benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of chemistry and chemical engineering, and specifically relates to an anaerobic scale inhibitor and a preparation method thereof. Background Art

[0002] The current mainstream treatment processes all adopt the "pretreatment + anaerobic + denitrification + nitrification + membrane treatment" method, among which the anaerobic reactor is the key equipment, mainly used to remove a large amount of organic matter. However, the infiltration of waste incineration plants is characterized by high concentrations of organic matter, ammonia nitrogen, and calcium and magnesium ions. Since the anaerobic reaction process provides additional alkalinity, the calcium and magnesium hardness of the system increases. Sulfate, phosphate and silicate ions are also easily generated and accumulated during the anaerobic reaction process, and combine with calcium and magnesium metal cations in the water to form water-insoluble salts.

[0003] At the same time, during the operation, the water-insoluble salts gradually crystallize and deposit on the inner wall of the anaerobic reactor and the inner wall of the outlet pipe. The outlet pipe of the anaerobic reactor is a gravity pipe with a small flow rate and slow flow rate. In addition, the layout of the anaerobic reactor has spatial distance requirements, which leads to a long pipe between the outlet pipe of the anaerobic reactor and the denitrification tank, aggravating the scale thickness of the inner wall of the outlet pipe of the anaerobic reactor, and finally causing blockage, which has adverse consequences on production. Summary of the invention

[0004] The purpose of the present invention is to provide an anaerobic scale inhibitor and a preparation method thereof in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: an anaerobic scale inhibitor and a preparation method thereof, comprising:

[0006] SAS: polyaspartic acid;

[0007] HPMA: hydroxyethylidene diphosphonic acid;

[0008] HEDP: ethylenediaminetetramethylenephosphonic acid;

[0009] PBTCA: polycarboxylic acid;

[0010] Among them, SAS:HPMA:HEDP:PBTCA=2:2:2:3~4.

[0011] In a preferred embodiment, the anaerobic scale inhibitor and the preparation method thereof comprise the following steps:

[0012] S1: Mix SAS and HPMA in a certain ratio. The specific ratio can be adjusted according to actual needs. In this case, the ratio of SAS to HPMA is 1:1;

[0013] S2: adding HEDP or PBTCA to the mixture of SAS and HPMA;

[0014] The amount of HEDP or PBTCA added can be adjusted as needed to achieve the best antiscaling effect;

[0015] S3: Use a whisk to mix the mixture well to ensure all ingredients are well mixed;

[0016] S4: Acid or alkali can be used to adjust the pH value of the mixture as needed to achieve the best scale inhibition effect;

[0017] S5: filtering the mixture to remove impurities and obtain a clear anaerobic antiscalant solution;

[0018] S6: Pack the filtered solution into smaller pieces and store them in sealed containers;

[0019] S7: Store the packaged anaerobic antiscalant in a cool, dry place, away from direct sunlight;

[0020] S8: Add the anaerobic antiscalant to the anaerobic reactor according to the recommended method of use;

[0021] S9: Regularly monitor the water quality in the anaerobic reactor and adjust the amount of anaerobic antiscalant added according to the actual situation;

[0022] S10: Regularly evaluate the effectiveness of the anaerobic scale inhibitor and optimize it based on the evaluation results, after which the entire anaerobic scale inhibitor preparation process can be completed.

[0023] In a preferred embodiment, in step S1, SAS and HPMA powders with a purity of ≥98% are mixed in a ratio of 1:1, and are fully stirred for 40 minutes using a high-speed stirrer with a rotation speed of 500-1000 rpm to ensure that the two components are evenly mixed to avoid excessive local concentration affecting the scale inhibition effect.

[0024] In a preferred embodiment, in step S2, HEDP or PBTCA is selected as an auxiliary component according to water quality conditions and experimental results, and is added at 10% to 20% of the total amount of SAS and HPMA. HEDP or PBTCA powder is slowly added to the SAS and HPMA mixture, and stirring is continued for 10 minutes to ensure that the three components are fully mixed to form a uniform solution.

[0025] In a preferred embodiment, in step S3, the mixture is stirred evenly using a stirrer with a rotation speed of 200-400 rpm to avoid excessive stirring to cause bubbles to be generated. The stirring time is 30 minutes to ensure that all ingredients are fully mixed to form a uniform and stable solution.

[0026] In a preferred embodiment, in step S4, a pH meter is used to monitor the pH value of the mixture, and 0.1M dilute hydrochloric acid or 0.1M sodium hydroxide solution is used to adjust the pH value as needed. The pH value is controlled at 7.0±0.5, and the specific range can be adjusted according to water quality conditions. When adjusting the pH value, stir while adding to ensure that the pH value is evenly distributed to avoid local pH values ​​that are too high or too low;

[0027] In step S5, the mixture is filtered using a microporous filter membrane with a pore size of 0.45 μm or a filter cloth with a mesh size of 80-100 to remove impurities and obtain a clear anaerobic antiscalant solution. The filtered solution should be clear and transparent without suspended matter and sediment.

[0028] In a preferred embodiment, in step S6, the filtered solution is divided into clean polyethylene plastic barrels or glass bottles, each barrel / bottle has a capacity of 20L. Air should be avoided during subpackaging to prevent the solution from oxidizing and deteriorating. The packaged anaerobic scale inhibitor should be stored in a cool and dry place, the temperature should be controlled at 10-25°C, avoid direct sunlight and high temperature environment to maintain product stability and effectiveness. The storage time is 1 year. After the storage time, the product performance may decline. Check the storage conditions regularly to ensure product quality.

[0029] In a preferred embodiment, in step S7, the packaged anaerobic scale inhibitor is stored in a room temperature environment, the temperature is controlled at 10-25°C, and high or low temperature environments are avoided. The storage time is 1 year. After the storage time is exceeded, the product performance may decline. Check the storage conditions regularly to ensure product quality.

[0030] In a preferred embodiment, in step S8, the anaerobic scale inhibitor is added to the anaerobic reactor according to the recommended method of use. The scale inhibitor can be dissolved in water at a concentration of 10% to 20%, and then continuously added to the reactor through a metering pump, and the added amount is 0.1% to 0.5% of the treated water volume. The specific amount added can be adjusted according to water quality conditions and scale inhibition effect.

[0031] In a preferred embodiment, in step S9, water quality indicators in the anaerobic reactor are regularly monitored, such as calcium and magnesium ion concentrations, pH value, and turbidity. The monitoring frequency should be adjusted according to changes in water quality and the use of scale inhibitors, such as once a day or a week. The monitoring data can be used to evaluate the effect of the scale inhibitor and adjust the addition amount and usage method in a timely manner;

[0032] In step S10, the use effect of the anaerobic scale inhibitor is regularly evaluated, including the scale inhibition rate, corrosion inhibition rate, and sludge activity. The evaluation method may include an experimental method or an on-site monitoring method. According to the evaluation results, the ratio of SAS, HPMA, HEDP or PBTCA, as well as the addition amount and the use method are adjusted to achieve the best scale inhibition effect. The ratio of HEDP can be increased to improve the chelating ability of the scale inhibitor; or the ratio of PBTCA can be increased to improve the dispersion ability of the scale inhibitor.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. In the present invention, the anaerobic scale inhibitor can inhibit the formation of scale through chelation solubilization, lattice distortion and electrostatic repulsion, enhance sludge activity, reduce corrosion to equipment, and alleviate scaling and clogging of equipment, thereby reducing equipment maintenance, extending the maintenance cycle of anaerobic sewage treatment system facilities, reducing operating costs, and improving the stability and safety of system operation.

[0035] 2. In the present invention, by mixing relatively inexpensive SAS and HPMA with HEDP or PBTCA, the cost of scale inhibitors can be effectively reduced, thereby reducing the operating cost of sewage treatment plants. At the same time, the combination of SAS and HPMA mixed with HEDP or PBTCA has a better scale inhibition effect, can effectively reduce the concentration of calcium and magnesium ions, and improve the retention rate of calcium and magnesium ions, thereby inhibiting the formation of scale, improving the operating efficiency of anaerobic reactors, extending the life of equipment, improving sewage treatment efficiency, improving system stability, and having environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the process principle of the present invention;

[0037] Figure 2 The scale inhibition effect of different scale inhibitors on calcium and magnesium ions in the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and 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.

[0039] Reference Figure 1-2 ,

[0040] Embodiment 1:

[0041] An anaerobic scale inhibitor and a preparation method thereof, comprising:

[0042] SAS: polyaspartic acid;

[0043] HPMA: hydroxyethylidene diphosphonic acid;

[0044] HEDP: ethylenediaminetetramethylenephosphonic acid;

[0045] PBTCA: polycarboxylic acid;

[0046] Among them, SAS:HPMA:HEDP:PBTCA=2:2:2:3.

[0047] The preparation method comprises the following steps:

[0048] S1: Mix SAS and HPMA in a certain ratio. The specific ratio can be adjusted according to actual needs. In this case, the ratio of SAS to HPMA is 1:1;

[0049] S2: adding HEDP or PBTCA to the mixture of SAS and HPMA;

[0050] The amount of HEDP or PBTCA added can be adjusted as needed to achieve the best antiscaling effect;

[0051] S3: Use a whisk to mix the mixture well to ensure all ingredients are well mixed;

[0052] S4: Acid or alkali can be used to adjust the pH value of the mixture as needed to achieve the best scale inhibition effect;

[0053] S5: filtering the mixture to remove impurities and obtain a clear anaerobic antiscalant solution;

[0054] S6: Pack the filtered solution into smaller pieces and store them in sealed containers;

[0055] S7: Store the packaged anaerobic antiscalant in a cool, dry place, away from direct sunlight;

[0056] S8: Add the anaerobic antiscalant to the anaerobic reactor according to the recommended method of use;

[0057] S9: Regularly monitor the water quality in the anaerobic reactor and adjust the amount of anaerobic antiscalant added according to the actual situation;

[0058] S10: Regularly evaluate the effectiveness of the anaerobic scale inhibitor and optimize it based on the evaluation results, after which the entire anaerobic scale inhibitor preparation process can be completed.

[0059] In step S1, SAS and HPMA powders with a purity of ≥98% are mixed in a ratio of 1:1, and are fully stirred for 40 minutes using a high-speed stirrer with a rotation speed of 500-1000 rpm to ensure that the two components are evenly mixed to avoid excessive local concentration affecting the scale inhibition effect.

[0060] In step S2, HEDP or PBTCA is selected as an auxiliary component according to the water quality conditions and experimental results, and is added at 10% to 20% of the total amount of SAS and HPMA. HEDP or PBTCA powder is slowly added to the SAS and HPMA mixture, and stirring is continued for 10 minutes to ensure that the three components are fully mixed to form a uniform solution.

[0061] In step S3, the mixture is stirred evenly using a stirrer with a rotation speed of 200-400 rpm to avoid excessive stirring to cause bubbles to be generated. The stirring time is 30 minutes to ensure that all ingredients are fully mixed to form a uniform and stable solution.

[0062] In step S4, the pH value of the mixture is monitored using a pH meter and adjusted using 0.1M dilute hydrochloric acid or 0.1M sodium hydroxide solution as needed. The pH value is controlled at 7.0±0.5, and the specific range can be adjusted according to water quality conditions. When adjusting the pH value, stir while adding to ensure that the pH value is evenly distributed to avoid local pH values ​​that are too high or too low;

[0063] In step S5, the mixture is filtered using a microporous filter membrane with a pore size of 0.45 μm or a filter cloth with a mesh size of 80-100 to remove impurities and obtain a clear anaerobic antiscalant solution. The filtered solution should be clear and transparent without suspended matter and sediment.

[0064] In step S6, the filtered solution is divided into clean polyethylene plastic barrels or glass bottles, each barrel / bottle has a capacity of 20L. Air should be avoided during subpackaging to prevent the solution from oxidizing and deteriorating. The packaged anaerobic antiscalant should be stored in a cool and dry place, the temperature should be controlled at 10-25°C, and avoid direct sunlight and high temperature environment to maintain product stability and effectiveness. The storage time is 1 year. After the storage time, the product performance may decline. Check the storage conditions regularly to ensure product quality.

[0065] In step S7, the packaged anaerobic scale inhibitor is stored in a room temperature environment, the temperature is controlled at 10-25°C, and high or low temperature environments are avoided. The storage time is 1 year. After the storage time is exceeded, the product performance may decline. Check the storage conditions regularly to ensure product quality.

[0066] In step S8, the anaerobic scale inhibitor is added to the anaerobic reactor according to the recommended method of use. The scale inhibitor can be dissolved in water at a concentration of 10% to 20%, and then continuously added to the reactor through a metering pump, and the added amount is 0.1% to 0.5% of the treated water volume. The specific amount added can be adjusted according to water quality conditions and scale inhibition effect.

[0067] In step S9, water quality indicators in the anaerobic reactor are regularly monitored, such as calcium and magnesium ion concentrations, pH value, and turbidity. The monitoring frequency should be adjusted according to changes in water quality and the use of scale inhibitors, such as monitoring once a day or once a week. The monitoring data can be used to evaluate the effect of the scale inhibitor and adjust the addition amount and usage method in a timely manner;

[0068] In step S10, the use effect of the anaerobic scale inhibitor is regularly evaluated, including the scale inhibition rate, corrosion inhibition rate, and sludge activity. The evaluation method may include an experimental method or an on-site monitoring method. According to the evaluation results, the ratio of SAS, HPMA, HEDP or PBTCA, as well as the addition amount and the use method are adjusted to achieve the best scale inhibition effect. The ratio of HEDP can be increased to improve the chelating ability of the scale inhibitor; or the ratio of PBTCA can be increased to improve the dispersion ability of the scale inhibitor.

[0069] Embodiment 2:

[0070] An anaerobic scale inhibitor and a preparation method thereof, comprising:

[0071] SAS: polyaspartic acid;

[0072] HPMA: hydroxyethylidene diphosphonic acid;

[0073] HEDP: ethylenediaminetetramethylenephosphonic acid;

[0074] PBTCA: polycarboxylic acid;

[0075] Among them, SAS:HPMA:HEDP:PBTCA=2:2:2:4.

[0076] The preparation method comprises the following steps:

[0077] S1: Mix SAS and HPMA in a certain ratio. The specific ratio can be adjusted according to actual needs. In this case, the ratio of SAS to HPMA is 1:1;

[0078] S2: adding HEDP or PBTCA to the mixture of SAS and HPMA;

[0079] The amount of HEDP or PBTCA added can be adjusted as needed to achieve the best antiscaling effect;

[0080] S3: Use a whisk to mix the mixture well to ensure all ingredients are well mixed;

[0081] S4: Acid or alkali can be used to adjust the pH value of the mixture as needed to achieve the best scale inhibition effect;

[0082] S5: filtering the mixture to remove impurities and obtain a clear anaerobic antiscalant solution;

[0083] S6: Pack the filtered solution into smaller pieces and store them in sealed containers;

[0084] S7: Store the packaged anaerobic antiscalant in a cool, dry place, away from direct sunlight;

[0085] S8: Add the anaerobic antiscalant to the anaerobic reactor according to the recommended method of use;

[0086] S9: Regularly monitor the water quality in the anaerobic reactor and adjust the amount of anaerobic antiscalant added according to the actual situation;

[0087] S10: Regularly evaluate the effectiveness of the anaerobic scale inhibitor and optimize it based on the evaluation results, after which the entire anaerobic scale inhibitor preparation process can be completed.

[0088] In step S1, SAS and HPMA powders with a purity of ≥98% are mixed in a ratio of 1:1, and are fully stirred for 40 minutes using a high-speed stirrer with a rotation speed of 500-1000 rpm to ensure that the two components are evenly mixed to avoid excessive local concentration affecting the scale inhibition effect.

[0089] In step S2, HEDP or PBTCA is selected as an auxiliary component according to the water quality conditions and experimental results, and is added at 10% to 20% of the total amount of SAS and HPMA. HEDP or PBTCA powder is slowly added to the SAS and HPMA mixture, and stirring is continued for 10 minutes to ensure that the three components are fully mixed to form a uniform solution.

[0090] In step S3, the mixture is stirred evenly using a stirrer with a rotation speed of 200-400 rpm to avoid excessive stirring to cause bubbles to be generated. The stirring time is 30 minutes to ensure that all ingredients are fully mixed to form a uniform and stable solution.

[0091] In step S4, the pH value of the mixture is monitored using a pH meter and adjusted using 0.1M dilute hydrochloric acid or 0.1M sodium hydroxide solution as needed. The pH value is controlled at 7.0±0.5, and the specific range can be adjusted according to water quality conditions. When adjusting the pH value, stir while adding to ensure that the pH value is evenly distributed to avoid local pH values ​​that are too high or too low;

[0092] In step S5, the mixture is filtered using a microporous filter membrane with a pore size of 0.45 μm or a filter cloth with a mesh size of 80-100 to remove impurities and obtain a clear anaerobic antiscalant solution. The filtered solution should be clear and transparent without suspended matter and sediment.

[0093] In step S6, the filtered solution is divided into clean polyethylene plastic barrels or glass bottles, each barrel / bottle has a capacity of 20L. Air should be avoided during subpackaging to prevent the solution from oxidizing and deteriorating. The packaged anaerobic antiscalant should be stored in a cool and dry place, the temperature should be controlled at 10-25°C, and avoid direct sunlight and high temperature environment to maintain product stability and effectiveness. The storage time is 1 year. After the storage time, the product performance may decline. Check the storage conditions regularly to ensure product quality.

[0094] In step S7, the packaged anaerobic scale inhibitor is stored in a room temperature environment, the temperature is controlled at 10-25°C, and high or low temperature environments are avoided. The storage time is 1 year. After the storage time is exceeded, the product performance may decline. Check the storage conditions regularly to ensure product quality.

[0095] In step S8, the anaerobic scale inhibitor is added to the anaerobic reactor according to the recommended method of use. The scale inhibitor can be dissolved in water at a concentration of 10% to 20%, and then continuously added to the reactor through a metering pump, and the added amount is 0.1% to 0.5% of the treated water volume. The specific amount added can be adjusted according to water quality conditions and scale inhibition effect.

[0096] In step S9, water quality indicators in the anaerobic reactor are regularly monitored, such as calcium and magnesium ion concentrations, pH value, and turbidity. The monitoring frequency should be adjusted according to changes in water quality and the use of scale inhibitors, such as monitoring once a day or once a week. The monitoring data can be used to evaluate the effect of the scale inhibitor and adjust the addition amount and usage method in a timely manner;

[0097] In step S10, the effect of the use of the anaerobic scale inhibitor is regularly evaluated, including the scale inhibition rate, corrosion inhibition rate, and sludge activity. The evaluation method may include an experimental method or an on-site monitoring method. According to the evaluation results, the ratio of SAS, HPMA, HEDP or PBTCA, as well as the addition amount and the method of use are adjusted to achieve the best scale inhibition effect. The ratio of HEDP can be increased to improve the chelating ability of the scale inhibitor; or the ratio of PBTCA can be increased to improve the dispersion ability of the scale inhibitor.

[0098] From the above, we can know that:

[0099] In the present invention, the anaerobic scale inhibitor can inhibit the formation of scale through chelation solubilization, lattice distortion and electrostatic repulsion, enhance sludge activity, reduce corrosion to equipment, and alleviate scaling and clogging of equipment, thereby reducing equipment maintenance, extending the maintenance cycle of anaerobic sewage treatment system facilities, reducing operating costs, and improving the stability and safety of system operation.

[0100] In the present invention, by mixing relatively low-priced SAS and HPMA with HEDP or PBTCA, the cost of the scale inhibitor can be effectively reduced, thereby reducing the operating cost of the sewage treatment plant. At the same time, the combination of SAS and HPMA mixed with HEDP or PBTCA has a better scale inhibition effect, can effectively reduce the concentration of calcium and magnesium ions, and improve the retention rate of calcium and magnesium ions, thereby inhibiting the formation of scale, improving the operating efficiency of the anaerobic reactor, extending the life of the equipment, improving the sewage treatment efficiency, improving the system stability, and having environmental benefits.

[0101] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0102] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anaerobic scale inhibitor and a preparation method thereof, characterized in that: include: SAS: polyaspartic acid; HPMA: hydroxyethylidene diphosphonic acid; HEDP: ethylenediaminetetramethylenephosphonic acid; PBTCA: polycarboxylic acid; Among them, SAS:HPMA:HEDP:PBTCA=2:2:2:3~4.

2. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: The preparation method comprises the following steps: S1: Mix SAS and HPMA in a certain ratio, and the specific ratio is adjusted according to actual needs; in this case, the ratio of SAS to HPMA is 1:1; S2: adding HEDP or PBTCA to the mixture of SAS and HPMA; The amount of HEDP or PBTCA added should be adjusted as needed to achieve the best antiscaling effect; S3: Use a whisk to mix the mixture well to ensure all ingredients are well mixed; S4: Use acid or alkali to adjust the pH value of the mixture as needed to achieve the best scale inhibition effect; S5: filtering the mixture to remove impurities and obtain a clear anaerobic antiscalant solution; S6: Pack the filtered solution into smaller pieces and store them in sealed containers; S7: Store the packaged anaerobic antiscalant in a cool, dry place, away from direct sunlight; S8: Add the anaerobic antiscalant to the anaerobic reactor according to the recommended method of use; S9: Regularly monitor the water quality in the anaerobic reactor and adjust the amount of anaerobic antiscalant added according to the actual situation; S10: Regularly evaluate the effectiveness of the anaerobic scale inhibitor and optimize it based on the evaluation results, after which the entire anaerobic scale inhibitor preparation process can be completed.

3. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In the step S1, SAS and HPMA powders with a purity of ≥98% are mixed in a ratio of 1:1, and are fully stirred for 40 minutes using a high-speed stirrer with a rotation speed of 500-1000 rpm to ensure that the two components are evenly mixed to avoid excessive local concentration affecting the scale inhibition effect.

4. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In step S2, HEDP or PBTCA is selected as an auxiliary component according to water quality conditions and experimental results, and is added at 10% to 20% of the total amount of SAS and HPMA; HEDP or PBTCA powder is slowly added to the mixture of SAS and HPMA, and stirring is continued for 10 minutes to ensure that the three components are fully mixed to form a uniform solution.

5. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In step S3, the mixture is stirred evenly using a stirrer with a rotation speed of 200-400 rpm to avoid excessive stirring to cause bubble generation; the stirring time is 30 minutes.

6. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In step S4, a pH meter is used to monitor the pH value of the mixture, and 0.1M dilute hydrochloric acid or 0.1M sodium hydroxide solution is used to adjust the pH value as needed; the pH value is controlled at 7.0±0.5, and the specific range can be adjusted according to water quality conditions; when adjusting the pH value, stirring is performed while adding; In step S5, the mixture is filtered using a microporous filter membrane with a pore size of 0.45 μm or a filter cloth with a mesh size of 80-100 to remove impurities and obtain a clear anaerobic antiscalant solution; the filtered solution should be clear and transparent without suspended matter and sediment.

7. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In the step S6, the filtered solution is packaged into clean polyethylene plastic barrels or glass bottles, each barrel / bottle has a capacity of 20L; air should be avoided during packaging to prevent the solution from oxidizing and deteriorating; the packaged anaerobic scale inhibitor should be stored in a cool and dry place, the temperature should be controlled at 10-25°C, and avoid direct sunlight and high temperature environment to maintain product stability and effectiveness; the storage time is 1 year.

8. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In step S7, the packaged anaerobic antiscalant is stored in a room temperature environment, and the temperature is controlled at 10-25°C.

9. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In step S8, the anaerobic scale inhibitor is added to the anaerobic reactor according to the recommended method of use; the scale inhibitor is dissolved in water at a concentration of 10% to 20%, and then continuously added to the reactor through a metering pump in an amount of 0.1% to 0.5% of the treated water volume.

10. The anaerobic scale inhibitor and preparation method thereof according to claim 1, characterized in that: In the step S9, the water quality indicators in the anaerobic reactor are regularly monitored, including calcium and magnesium ion concentrations, pH value, and turbidity; the monitoring frequency should be adjusted according to the changes in water quality and the use of the scale inhibitor, and monitoring should be performed once a day or a week; the monitoring data is used to evaluate the effect of the scale inhibitor and to adjust the addition amount and usage method in a timely manner; In step S10, the use effect of the anaerobic scale inhibitor is regularly evaluated, including scale inhibition rate, corrosion inhibition rate, and sludge activity; the evaluation method includes an experimental method or an on-site detection method; according to the evaluation results, the ratio of SAS, HPMA, HEDP or PBTCA, as well as the addition amount and the use method are adjusted to achieve the best scale inhibition effect.

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