Novel double-oxygen-layer composite carrier membrane reactor for dynamic oxygen supply adjustment and application of novel double-oxygen-layer composite carrier membrane reactor

Abstract

The invention relates to a novel dynamic oxygen supply regulation double-oxygen-layer composite carrier membrane bio-membrane reactor, which is particularly suitable for high-efficiency treatment of high-ammonia regulation nitrogen wastewater. The reactor comprises an AI intelligent control system, a dynamic oxygen mechanism and a composite carrier membrane system, the oxygen supply amount can be adjusted in real time according to the change of the concentration of pollutants in wastewater, and it is ensured that the concentration of dissolved oxygen in the reactor is always in the optimal range, so that the degradation effect of microorganisms is optimized. The reactor adopts a unique double-oxygen-layer structure, the inner layer and the outer layer respectively provide an aerobic environment and an anaerobic environment, and efficient removal of ammonia nitrogen is promoted. Meanwhile, by using the composite membrane material (the hollow fiber membrane with the modified graphene oxide-polyvinyl alcohol coating), the adhesive force and the stability of the biological membrane are remarkably improved, and falling of the membrane and accumulation of pollutants are avoided. The reactor monitors and adjusts parameters such as dissolved oxygen, pH value and temperature in real time through an AI intelligent control system, and it is ensured that the reactor can keep excellent treatment effects under various water quality and load conditions.

Description

Technical Field

[0001] The invention relates to wastewater treatment technology, in particular to a novel double oxygen layer composite carrier membrane reactor, which optimizes the growth environment of microorganisms by dynamically adjusting oxygen supply and improving the removal efficiency of pollutants in wastewater, especially the removal of nitrogen pollutants. Background Art

[0002] With the rapid development of industrialization and urbanization in my country, wastewater contains high concentrations of pollutants such as ammonia nitrogen and nitrogen organic matter, which seriously threaten the safety of the environment and water quality. In order to effectively remove these pollutants, biofilm reactors (such as biological contact oxidation reactors) are widely used. However, existing biofilm reactors still face the problem of unstable oxygen supply, which may lead to a decrease in microbial activity and affect the treatment effect, especially in nitrogen removal.

[0003] Patent CN 109734198 B (A double oxygen layer biofilm reactor for wastewater treatment and a wastewater treatment method) proposes a double oxygen layer biofilm reactor, which promotes the removal of ammonia nitrogen in wastewater by adjusting the dissolved oxygen concentration. Although the reactor can achieve a removal rate of 80%-90%, in practical applications, the dynamic regulation of oxygen concentration still needs to be further optimized to cope with changes in different water quality and load. In addition, patent CN 110606556 B (A tail gas reflow biofilm reactor) proposes a tail gas reflow biofilm reactor, which controls the aeration intensity in the reactor by adjusting the ratio of tail gas reflow and fresh air, thereby adjusting the dissolved oxygen concentration. Although this technology has been successful in controlling the dissolved oxygen content in the reactor, it relies on the reflux of tail gas for oxygen regulation, and does not fully utilize the dynamic regulation of oxygen supply to optimize the formation of biofilm and nitrogen removal efficiency. Patent CN 102659244 B (An integrated internal circulation denitrification and carbon removal biofilm reactor and operation method) introduces an integrated internal circulation denitrification and carbon removal biofilm reactor. This technology promotes the full mixing of the water phase and the gas phase in the reactor by means of internal circulation water flow, improves the oxygen transmission efficiency of the reactor, and optimizes the removal of nitrogen and carbon. However, this technology is insufficient in the flexibility and dynamic adjustment of oxygen control, especially when facing different pollution loads, the responsiveness and stability of the system still need to be further improved.

[0004] Therefore, although the prior art provides some solutions, there is still room for optimization in terms of dynamic oxygen supply regulation and the formation of a double oxygen layer biofilm. The present invention solves the problem of unstable oxygen supply in the prior art by innovating a dynamic oxygen supply regulation system combined with a double oxygen layer biofilm structure, thereby improving the removal efficiency of nitrogen pollutants. Summary of the invention

[0005] The present invention relates to a novel double oxygen layer composite carrier membrane reactor with dynamic oxygen supply regulation and its application in wastewater treatment. The reactor combines an AI intelligent control system, a dynamic oxygen regulation mechanism and a composite carrier membrane system, and can efficiently treat high ammonia nitrogen wastewater, especially suitable for environments with variable water quality. The innovation of the present invention is to ensure the stability of the biofilm inside the reactor, the dynamic regulation of oxygen concentration, and the efficient pollutant removal ability through advanced technology integration, thus overcoming the defects in the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A novel double oxygen layer composite carrier membrane reactor with dynamic oxygen supply regulation Figure 1 The reactor shown includes a reactor body 1, a water inlet system (16, 18, 19), a stirring system (2), an oxygen supply and regulation system (20, 21, 22), a biofilm carrier (15), an AI intelligent control and monitoring system (5, 6, 7, 23), a water circulation and drainage system (9, 10, 11, 12, 13, 14), a gas reflux system (20, 21), a composite membrane material (15), an intelligent exhaust system (8, 20), and a water outlet system (8, 17).

[0008] The reactor body 1 is made of corrosion-resistant stainless steel and preferably has a volume range of 1.5 m 3 -2 m 3 , the temperature inside the reactor is 20℃-35℃, and the gas pressure inside the reactor is 0.05MPa-0.10MPa.

[0009] The water inlet 16 of the reactor is connected to the water inlet pump 18, and the wastewater flows into the reactor evenly through the water inlet pipe 19. The preferred water inlet flow rate is 0.5m 3 / h-1.5m 3 / h, the wastewater enters the reactor through the water inlet and contacts with the biofilm system for treatment.

[0010] Furthermore, the treated wastewater is discharged through the wastewater outlet 8 and the discharge branch pipe 17 .

[0011] The discharge port of the reactor is designed with an adjustable valve to ensure that the effluent flow rate during the treatment process matches the treatment capacity of the reactor.

[0012] The reactor is provided with a secondary and tertiary water circulation system, and the wastewater is ensured to circulate evenly in the reactor through circulating water pumps 9, 11 and related pipes 10, 12, 13, 14.

[0013] The bottom of the reactor is equipped with a high-efficiency stirring device 2, preferably with an adjustable stirring speed (20-35 r / min) to ensure that the wastewater is fully in contact with the biofilm, while avoiding the accumulation of sediments and promoting the degradation of microorganisms.

[0014] The oxygen supply system adopts a precise dynamic adjustment mechanism and is monitored in real time by an AI intelligent control system 24 hours a day. When the dissolved oxygen concentration is low, the system automatically increases the gas flow to supplement oxygen; when the dissolved oxygen concentration is too high, the gas flow is automatically reduced.

[0015] Furthermore, the air flow meter 20 monitors the gas flow to ensure a stable supply of oxygen, preferably within a flow range of 1.5 m 3 / h-2.5m 3 / h.

[0016] Furthermore, the air pressure sensor 21 monitors the oxygen pressure in real time and feeds back to the embedded control unit 23. The control unit adjusts the output of the air pump 22 according to the PID control algorithm to accurately adjust the oxygen supply.

[0017] Furthermore, the embedded control unit 23 is connected to the remote monitoring module through the AI ​​intelligent management and control system 24, which can realize the remote operation, data analysis and alarm functions of the reactor.

[0018] The reactor system is designed with an oxygen reflow mechanism, so part of the gas is recirculated through tail gas and mixed with fresh air to supply oxygen again.

[0019] The biofilm carrier 15 in the reactor adopts a hollow fiber membrane with a modified graphene oxide-polyvinyl alcohol composite coating.

[0020] The composite coating material has good hydrophobicity and mechanical strength.

[0021] The biofilm forms a double oxygen layer structure on the membrane surface, wherein the inner layer provides oxygen and the outer layer maintains a lower oxygen environment, thereby promoting the activity of denitrifying microorganisms.

[0022] The reactor is equipped with a dissolved oxygen sensor 5 to detect the concentration of dissolved oxygen in real time, and the preferred dissolved oxygen concentration range is 2.5 mg / L-3.5 mg / L.

[0023] The reactor system is also integrated with a pH sensor 6 and a temperature sensor 7 to monitor the pH value and temperature of the wastewater in real time.

[0024] A wastewater treatment method based on a novel double oxygen layer composite carrier membrane biofilm reactor with dynamic oxygen supply regulation comprises the following steps:

[0025] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet 16, and the water flow rate is precisely adjusted by the water inlet pump 18 (0.5m3 / h-1.5m 3 / h) to ensure that the wastewater is evenly distributed. The stirring system in the reactor (the speed is controlled at 25-35r / min) is started to ensure that the wastewater is fully in contact with the biofilm carrier 15 and to avoid the accumulation of sediment in the wastewater.

[0026] S2 Biofilm formation and reaction: The hollow fiber membrane biofilm carrier 15 in the reactor provides a stable attachment surface for microorganisms. Under the action of influent and airflow, the biofilm is stably formed on the membrane surface, the inner layer maintains an aerobic environment, and the outer layer forms an anaerobic environment. Through nitrification and denitrification, pollutants such as ammonia nitrogen in the wastewater are effectively removed.

[0027] S3 Dynamic oxygen supply adjustment: The oxygen supply system automatically adjusts the oxygen flow rate through the air flow meter 20, the air pressure sensor 21 and the electric air pump 22. The dissolved oxygen concentration in the reactor is controlled within the range of 2.5mg / L-3.5mg / L, and the intelligent control system automatically adjusts the oxygen supply according to the change of pollutant concentration in the wastewater to ensure that the biofilm grows in the best oxygen environment.

[0028] S4 Wastewater treatment and pollutant removal: In the reactor, the biofilm effectively removes pollutants such as ammonia nitrogen and total nitrogen in the wastewater through a double oxygen layer structure. The difference in oxygen concentration between the inner and outer layers promotes the coordinated work of aerobic and anaerobic bacteria, and the ammonia nitrogen removal rate reaches more than 85%, ensuring that the wastewater meets the discharge standards.

[0029] S5 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet 8, and the system automatically adjusts the outlet flow to ensure that the ammonia nitrogen concentration of the wastewater reaches the predetermined standard. The real-time data in the reactor (such as dissolved oxygen, pH, temperature, etc.) is monitored by the intelligent control system (target 23, 24), and the oxygen supply, wastewater flow and other parameters are automatically adjusted to ensure efficient and stable operation of the system.

[0030] The beneficial effects of the present invention are mainly manifested in the following aspects:

[0031] (1) Dynamic oxygen supply regulation: By automatically adjusting the gas flow rate and oxygen concentration, the problem of unstable dissolved oxygen in traditional reactors is avoided, making the formation and growth environment of the biofilm more stable.

[0032] (2) Composite carrier membrane: The use of modified graphene oxide and polyvinyl alcohol composite coating improves the adhesion and durability of the biofilm and improves the wastewater treatment efficiency.

[0033] (3) Intelligent control system: The intelligent control system equipped with the reactor can monitor the wastewater treatment status in real time, automatically adjust the operating parameters of the reactor, and ensure the efficiency and stability of the treatment process.

[0034] (4) Energy saving and environmental protection: The reactor system greatly reduces energy consumption and reduces the risk of secondary pollution by recycling and reusing gas and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the structure of a new double oxygen layer composite carrier membrane biofilm reactor with dynamic oxygen supply regulation

[0036] 1. Reactor body, 2. Stirring device, 3. Secondary circulation outlet, 4. Third circulation outlet,

[0037] 5. Dissolved oxygen sensor, 6. PH sensor, 7. Temperature sensor, 8. Wastewater outlet, 9. Secondary circulation water pump, 10. Secondary circulation pipeline, 11. Tertiary circulation water pump, 12. Tertiary circulation pipeline, 13. Tertiary circulation water inlet, 14. Secondary circulation water inlet, 15. Hollow fiber membrane biofilm carrier (modified graphene oxide-polyvinyl alcohol composite coating), 16. Water inlet, 17. Discharge branch pipe, 18. Water inlet pump, 19. Water inlet pipeline, 20. Air flow meter

[0038] , 21. Air pressure sensor, 22. Electric air pump, 23. Embedded control unit, PID control algorithm, remote monitoring, 24. AI intelligent management and control system, remote control, automatic alarm, data analysis DETAILED DESCRIPTION

[0039] Example 1

[0040] In this embodiment, the wastewater treated is high ammonia nitrogen wastewater with an ammonia nitrogen concentration of 150 mg / L. The reactor volume is 1.5 m 3 The gas flow rate of the oxygen supply system is set to 2.0m 3 / h, the goal is to maintain the dissolved oxygen concentration in the reactor at 3.0 mg / L. The reaction time is set to 8 hours and the temperature is controlled at 25°C.

[0041] Wastewater treatment steps:

[0042] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet (16) with an inlet flow rate of 1.5m 3 / h, which is precisely regulated by the inlet water pump (18). The stirring system (2) in the reactor is started at a speed of 25r / min to ensure that the wastewater is fully in contact with the biofilm carrier (15).

[0043] S2 Dynamic oxygen supply regulation: The oxygen supply system automatically adjusts the oxygen flow rate through the air flow meter (20), the air pressure sensor (21) and the electric air pump (22), maintaining the dissolved oxygen concentration in the reactor at 3.0 mg / L and optimizing the biofilm environment.

[0044] S3 Wastewater treatment and pollutant removal: The wastewater passes through the biofilm carrier (15), through the action of the double oxygen layer structure, ammonia nitrogen is removed through nitrification and denitrification reactions.

[0045] S4 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8).

[0046] The final ammonia nitrogen removal rate reached 88%, and the ammonia nitrogen concentration in the wastewater was 18 mg / L.

[0047] Example 2

[0048] This example uses municipal sewage for treatment, and the initial ammonia nitrogen concentration is 50 mg / L. The reactor volume is set to 2m 3 The gas flow rate of the oxygen supply system is set to 1.8m 3 / h, the dissolved oxygen concentration was controlled at 2.7 mg / L, the reaction time was 6 hours, and the temperature was controlled at 22°C.

[0049] Wastewater treatment steps:

[0050] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet (16), and the water flow rate is accurately adjusted to 0.8m by the water inlet pump (18). 3 / h.

[0051] S2 Dynamic oxygen supply adjustment: The intelligent control system automatically adjusts the oxygen flow rate according to real-time monitoring data to maintain the dissolved oxygen concentration at 2.7mg / L.

[0052] S3 wastewater treatment and pollutant removal: The double oxygen layer biofilm structure promotes the removal of ammonia nitrogen, and microorganisms remove pollutants through aerobic and anaerobic reactions.

[0053] S4 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8).

[0054] The final ammonia nitrogen removal rate reached 85%, and the ammonia nitrogen concentration of the treated wastewater was 7.5 mg / L.

[0055] Example 3

[0056] In this example, industrial wastewater with an initial ammonia nitrogen concentration of 200 mg / L was treated. The reactor volume was 2m 3 , the oxygen supply system gas flow rate is 2.2m 3 / h, the dissolved oxygen concentration was controlled at 3.2 mg / L, the reaction time was set to 10 hours, and the temperature was controlled at 28°C.

[0057] Wastewater treatment steps:

[0058] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet (16), and the water flow rate is accurately adjusted to 1.2m by the water inlet pump (18). 3 / h.

[0059] S2 Dynamic oxygen supply adjustment: The oxygen supply system adjusts the gas flow according to the real-time monitored dissolved oxygen concentration to maintain the dissolved oxygen concentration at 3.2 mg / L.

[0060] S3 wastewater treatment and pollutant removal: Through biofilm carriers (15) and double oxygen layer structures, microorganisms work synergistically in aerobic and anaerobic zones to effectively remove pollutants such as ammonia nitrogen.

[0061] S4 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8).

[0062] The final ammonia nitrogen removal rate reached 92%, and the ammonia nitrogen concentration of the treated wastewater was 16 mg / L.

[0063] Example 4

[0064] This example treats mixed sewage with an ammonia nitrogen concentration of 120 mg / L. The reactor volume is 1.5 m 3 The gas flow rate of the oxygen supply system is 2.0m 3 / h, the dissolved oxygen concentration was controlled at 2.8 mg / L, the reaction time was set to 9 hours, and the temperature was controlled at 23°C.

[0065] Wastewater treatment steps:

[0066] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet (16) with a flow rate of 1.0m 3 / h, which is regulated by the inlet water pump (18).

[0067] S2 Dynamic oxygen supply adjustment: The oxygen supply system automatically adjusts the air flow rate according to real-time data to maintain the dissolved oxygen concentration at 2.8mg / L.

[0068] S3. Wastewater treatment and pollutant removal: The double oxygen layer biofilm structure ensures the effective removal of pollutants such as ammonia nitrogen and total nitrogen in wastewater.

[0069] S4. Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8).

[0070] The final ammonia nitrogen removal rate reached 86%, and the ammonia nitrogen concentration of the treated wastewater was 17 mg / L.

[0071] Example 5

[0072] This example uses low ammonia nitrogen wastewater for treatment, with an ammonia nitrogen concentration of 30 mg / L. The reactor volume is set to 1.5 m 3, the oxygen supply system gas flow rate is 1.6m 3 / h, the dissolved oxygen concentration was controlled at 3.0 mg / L, the reaction time was 7 hours, and the temperature was controlled at 26°C.

[0073] Wastewater treatment steps:

[0074] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet (16), and the water flow rate is adjusted to 1.0m by the water inlet pump (18). 3 / h.

[0075] S2 Dynamic oxygen supply adjustment: The oxygen supply system automatically adjusts the oxygen flow rate according to real-time data to maintain the dissolved oxygen concentration at 3.0 mg / L.

[0076] S3 Wastewater treatment and pollutant removal: The double oxygen layer biofilm structure removes pollutants such as ammonia nitrogen in wastewater through microbial metabolism.

[0077] S4 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8).

[0078] The final ammonia nitrogen removal rate reached 80%, and the ammonia nitrogen concentration of the treated wastewater was 6 mg / L.

[0079] Example 6

[0080] This example treats high ammonia nitrogen wastewater with an ammonia nitrogen concentration of 170 mg / L. The reactor volume is set to 1.8 m 3 , the oxygen supply system gas flow rate is 2.1m 3 / h, the dissolved oxygen concentration was maintained at 3.1 mg / L, the reaction time was 8 hours, and the temperature was controlled at 30°C.

[0081] Wastewater treatment steps:

[0082] S1 Wastewater injection and preliminary mixing: Wastewater enters the reactor through the water inlet (16), and the water flow rate is accurately adjusted to 1.0m by the water inlet pump (18). 3 / h.

[0083] S2 Dynamic oxygen supply adjustment: The oxygen supply system automatically adjusts the oxygen flow rate according to real-time data to maintain the dissolved oxygen concentration at 3.1 mg / L.

[0084] S3 Wastewater Treatment and Pollutant Removal: The double oxygen layer biofilm structure in the reactor removes ammonia nitrogen from the wastewater through aerobic and anaerobic reactions.

[0085] S4 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8).

[0086] The final ammonia nitrogen removal rate reached 90%, and the ammonia nitrogen concentration of the treated wastewater was 17 mg / L.

[0087] The wastewater treatment parameters of the above embodiment are shown in Table 1 below:

[0088] Table 1

[0089]

[0090] The foregoing examples are merely illustrative and are used to explain some features of the method of the present invention. The appended claims are intended to require the widest possible range that can be imagined, and the embodiments presented herein are demonstrated by the applicant's actual test results. Therefore, the applicant's intention is that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Some numerical ranges used in the claims also include sub-ranges therein, and changes in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A novel double oxygen layer composite carrier membrane biofilm reactor with dynamic oxygen supply regulation comprises: A reactor body (1); a water inlet system, comprising a water inlet (16), a water inlet pump (18) and a water inlet pipe (19); a stirring system (2), wherein the stirring system has an adjustable speed within a range of 20 to 35 r / min; an oxygen supply and regulation system, comprising an air flow meter (20), an air pressure sensor (21), an electric air pump (22) and an embedded control unit (23), wherein the oxygen supply and regulation system is used to regulate the oxygen concentration in the reactor in real time; a biofilm carrier (15); an intelligent control and monitoring system (5, 6, 7, 23), wherein the system is used to monitor parameters such as dissolved oxygen, pH value and temperature in the reactor in real time and to regulate the working state of the reactor; a water circulation and drainage system, comprising secondary and tertiary circulation water pumps (9, 11) and related pipes (10, 12, 13, 14); a gas reflux system, wherein oxygen is supplied by mixing exhaust gas reflux with fresh air; and a water outlet system (8, 17), wherein the treated wastewater is discharged through a discharge branch pipe (17).

2. According to claim 1, the biofilm carrier is a hollow fiber membrane biofilm carrier, which adopts a modified graphene oxide-polyvinyl alcohol composite coating and has high adhesion and durability.

3. The reactor according to claim 1, wherein the dissolved oxygen concentration in the reactor is dynamically adjusted by an oxygen supply and regulation system and maintained between 2.5 mg / L and 3.5 mg / L.

4. The reactor according to claim 1, wherein the reaction time of the reactor is 6 hours to 12 hours, and the temperature is controlled between 20°C and 30°C to ensure optimal biofilm growth conditions.

5. The reactor according to claim 1, wherein the gas flow rate in the reactor is in the range of 1.5 m / s. 3 / h to 2.5m 3 / h.

6. The reactor according to claim 1, wherein the pH value in the reactor ranges from 7.0 to 7.5, ensuring optimal biofilm growth conditions.

7. A wastewater treatment method based on a novel double oxygen layer composite carrier membrane biofilm reactor with dynamic oxygen supply regulation, characterized in that: The following steps are involved: S1 Wastewater injection and preliminary mixing: Wastewater is injected into the reactor through the water inlet (16), and the water flow rate is accurately regulated by the water inlet pump (18); S2 Biofilm formation and reaction: The wastewater is fully contacted with the biofilm carrier (15) and mixed through the stirring system (2); S3 dynamic oxygen supply adjustment: The oxygen supply system automatically adjusts the oxygen flow rate according to real-time data to maintain the dissolved oxygen concentration between 2.5mg / L and 3.5mg / L; S4 Wastewater treatment and pollutant removal: The wastewater is treated in the reactor, and the microorganisms in the biofilm remove ammonia nitrogen through nitrification and denitrification reactions; S5 Wastewater discharge and system optimization: The treated wastewater is discharged through the outlet (8), and the ammonia nitrogen removal rate reaches more than 85%.

8. The method according to claim 6, wherein the temperature in the reactor is controlled between 20°C and 30°C to improve the processing efficiency of the reactor.

9. The method according to claim 6, wherein the biofilm in the reactor forms a double oxygen layer structure, the inner layer is an aerobic zone, and the outer layer is an anaerobic zone.

10. The method according to claim 6, wherein the dissolved oxygen concentration is automatically adjusted by an AI intelligent control system to cope with changes in pollutant concentrations in the wastewater.

11. The method according to claim 6, wherein the water circulation system of the reactor ensures uniform flow of wastewater through secondary and tertiary water pumps to improve reaction efficiency.

12. The method according to claim 6, wherein the intelligent control system automatically adjusts the working state of the reactor by real-time monitoring of parameters such as dissolved oxygen, pH value, temperature, etc. in the reactor to achieve efficient wastewater treatment.

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