Device for reducing inhibition effect of PFASs new pollutants on activated sludge microorganisms

Abstract

The utility model discloses a device for reducing the inhibition effect of PFASs new pollutants on activated sludge microorganisms, which comprises an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and an ultrasonic reaction pressure tank, a base is welded at the bottom of the ultrasonic reaction pressure tank, and the top and the bottom of the ultrasonic reaction pressure tank are respectively connected with a liquid inlet regulating valve pipe and a liquid outlet regulating valve pipe. A water outlet of the anaerobic tank is connected with a water inlet of the anoxic tank, a water outlet of the anoxic tank is connected with a water inlet of the aerobic tank, and mixed liquid flows back to the water inlet of the anoxic tank through a backflow pipeline. According to the device for reducing the inhibition effect of the new PFASs pollutants on the activated sludge microorganisms, the returned sludge is subjected to reaction treatment by adopting ultrasonic waves, the PFASs treatment efficiency of an A2 / O process is improved in a manner of enhancing the activity of the microorganisms, and the ultrasonic waves directly act on the microorganisms in the activated sludge, so that the PFASs treatment efficiency is improved. Compared with the prior art acting on a mud-water mixture, the electric energy consumption can be saved, the use cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of return sludge in sewage treatment, and particularly relates to a device for reducing the inhibitory effect of new pollutants of PFASs on activated sludge microorganisms. Background Technique

[0002] New pollutants refer to pollutants that have been newly discovered or concerned, pose risks to the ecological environment or human health, have not been included in management, or the existing management measures are not sufficient to effectively prevent and control their risks. At present, more than 20 major categories of new pollutants have been discovered globally, and each category contains dozens or even hundreds of compounds. At present, the new pollutants mainly concerned internationally include: environmental endocrine disruptors, persistent organic pollutants such as perfluorinated compounds, antibiotics, microplastics and other 4 categories. Different types of new pollutants have one or more biological toxicities such as organ toxicity, embryo toxicity, reproductive toxicity, neurotoxicity, endocrine disruption effect, carcinogenicity, teratogenicity, and mutagenicity.

[0003] PFASs refer to halogenated organic compounds in which all hydrogen atoms are replaced by fluorine, and have excellent stability, surface activity, hydrophobic and oleophobic properties, etc. However, in recent years, with the wide application of PFASs in the manufacture of various products including textiles, clothing, carpets, paper coatings, cosmetics, non-stick pans, waterproof materials, and foam fire extinguishers, PFASs have inevitably accumulated in sewage treatment plants. However, due to the limitation of treatment technology, existing sewage treatment technologies and equipment at home and abroad (such as coagulation, sedimentation, filtration, and chlorination sewage treatment technologies, etc.) often cannot completely remove PFASs, which has seriously threatened human health and the safety of the entire ecological environment.

[0004] At present, the main treatment methods of PFASs include electrochemical oxidation method, ozone oxidation method, photocatalytic oxidation method, adsorption method, biological treatment method, etc. The biological treatment method is the mainstream process adopted by sewage treatment plants and has the advantages of stability, economy, etc. Among them, the A 2 / O process is a commonly used biological secondary sewage treatment process and is widely used in urban sewage treatment plants and industrial sewage treatment plants. The A 2 / O process has a certain removal effect on PFASs by the microorganisms in the return sludge, but PFASs inhibit the growth of microorganisms due to their strong biological toxicity, resulting in low removal efficiency of PFASs by microorganisms. Therefore, there is an urgent need for a device for reducing the inhibitory effect of new pollutants of PFASs on activated sludge microorganisms to improve the biological activity of microorganisms in the return sludge and enhance the removal efficiency of microorganisms on PFASs. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present utility model provides a device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms, and solves the problems raised in the above-mentioned background art.

[0006] The present utility model provides the following technical solutions: A device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms includes an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, and an ultrasonic reaction pressure tank. A base is welded to the bottom of the ultrasonic reaction pressure tank. The top and bottom of the ultrasonic reaction pressure tank are respectively connected with a liquid inlet regulating valve pipe and a liquid outlet regulating valve pipe. The water outlet of the anaerobic tank is connected to the water inlet of the anoxic tank, the water outlet of the anoxic tank is connected to the water inlet of the aerobic tank, and the water outlet of the aerobic tank is connected to the water inlet of the secondary sedimentation tank;

[0007] The water outlet of the secondary sedimentation tank is connected to one end of the liquid inlet regulating valve pipe through a connecting pipe, and one end of the liquid outlet regulating valve pipe is communicated with the anaerobic tank to form a reflux channel;

[0008] A stirring assembly and an ultrasonic generator are arranged inside the ultrasonic reaction pressure tank, and an anti-interference space is arranged between the stirring assemblies.

[0009] Further, the valves arranged in the liquid inlet regulating valve pipe and the valves arranged in the liquid outlet regulating valve pipe are both flow regulating valves, and a flow monitoring device is installed on one end of the liquid inlet regulating valve pipe to facilitate controlling the operation rhythm of the overall device.

[0010] Further, the stirring assembly includes a turntable, a rotating shaft, a spiral blade, and a servo motor. The inner side of the middle of the spiral blade is fixedly sleeved on the surface of one end of the rotating shaft. The other end of the rotating shaft is sleeved inside the top of the ultrasonic reaction pressure tank through a sealing ring and a bearing, and the end of the other end of the rotating shaft is in transmission connection with the output end of the servo motor. Thus, the stirring assembly is used to continuously stir to ensure that the low-intensity ultrasonic waves output by the ultrasonic generator are evenly dispersed.

[0011] Further, the working part of the ultrasonic generator is sleeved inside the ultrasonic reaction pressure tank, and the number of ultrasonic generators is not less than two and they are evenly distributed on both side walls of the ultrasonic reaction pressure tank. The ultrasonic waves generated by the ultrasonic generators are used to react with the reflux sludge, and then the efficiency of treating PFASs by the A 2 / O process is improved by enhancing the microbial activity.

[0012] Further, an outer protective cover is sleeved outside the ultrasonic reaction pressure tank, and the outer protective cover covers and protects the ultrasonic generator to prevent other structures in the environment from damaging the ultrasonic generator.

[0013] Furthermore, the ultrasonic reaction pressure tank specifically adopts a sealed pressure tank structure. Thus, under the action of pressure, the ultrasonic-treated return sludge can be directly transported into the anaerobic tank without the need for additional pumping equipment, reducing the use cost of the overall device.

[0014] Furthermore, a protective cover frame is sleeved outside the turntable, and the bottom of the protective cover frame is fixedly connected to the inner wall of the bottom of the ultrasonic reaction pressure tank. The protective cover frame is used to share the pressure of the sludge flow suffered by the turntable, avoiding damage to the turntable and extending its service life. Beneficial effects

[0015] 1. The device for reducing the inhibitory effect of new pollutants of PFASs on activated sludge microorganisms proposed by the present utility model uses ultrasonic waves to react and treat the return sludge, and improves the efficiency of treating PFASs by the A / O process by enhancing the microbial activity. Moreover, the ultrasonic waves directly act on the microorganisms in the activated sludge. Compared with the prior art that acts on the mixture of mud and water, it can save the consumption of electric energy, reduce the use cost and improve the working efficiency. 2 / O process for treating PFASs, and the ultrasonic waves directly act on the microorganisms in the activated sludge. Compared with the prior art that acts on the mixture of mud and water, it can save the consumption of electric energy, reduce the use cost and improve the working efficiency.

[0016] 2. The ultrasonic reaction pressure tank set by the present utility model is a sealed pressure tank. During subsequent use, under the action of pressure, the sludge after ultrasonic treatment can directly flow back to the anaerobic tank without the need for additional pumping equipment such as a reflux pump, thus fully reducing the use cost of the overall device. Brief description of the drawings

[0017] Figure 1 is a process schematic diagram of the present utility model;

[0018] Figure 2 is a front view schematic diagram of the ultrasonic reaction pressure tank of the present utility model;

[0019] Figure 3 is a three-dimensional schematic diagram of the ultrasonic reaction pressure tank of the present utility model;

[0020] Figure 4 is a sectional view schematic diagram of the ultrasonic reaction pressure tank of the present utility model;

[0021] Figure 5 is an enlarged schematic diagram of the turntable of the present utility model.

[0022] In the figure: 1. Anaerobic tank; 2. Anoxic tank; 3. Aerobic tank; 4. Secondary sedimentation tank; 5. Ultrasonic reaction pressure tank; 6. Liquid inlet regulating valve pipe; 7. Liquid outlet regulating valve pipe; 8. Flow monitoring device; 9. Ultrasonic generator; 10. Turntable; 11. Rotating shaft; 12. Helical blade; 13. Servo motor; 14. Base; 15. Protective cover frame; 16. Outer protective cover. Specific implementation manners

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model. Embodiment 1

[0024] Please refer to Figures 1-4 , a device for reducing the inhibitory effect of new PFASs pollutants on activated sludge microorganisms, including an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a secondary sedimentation tank 4, and an ultrasonic reaction pressure tank 5. A base 14 is welded to the bottom of the ultrasonic reaction pressure tank 5. The top and bottom of the ultrasonic reaction pressure tank 5 are respectively connected with a liquid inlet regulating valve pipe 6 and a liquid outlet regulating valve pipe 7. The water outlet of the anaerobic tank 1 is connected to the water inlet of the anoxic tank 2, the water outlet of the anoxic tank 2 is connected to the water inlet of the aerobic tank 3, and the water outlet of the aerobic tank 3 is connected to the water inlet of the secondary sedimentation tank 4;

[0025] The ultrasonic reaction pressure tank 5 specifically adopts a sealed pressure tank structure, so that the ultrasonicated return sludge can be directly transported into the anaerobic tank 1 under the action of pressure, without additional pumping equipment, reducing the use cost of the overall device;

[0026] The water outlet of the secondary sedimentation tank 4 is connected to one end of the liquid inlet regulating valve pipe 6 through a connecting pipe, and one end of the liquid outlet regulating valve pipe 7 is communicated with the anaerobic tank 1 to form a reflux channel. The valves provided in the liquid inlet regulating valve pipe 6 and the liquid outlet regulating valve pipe 7 are both flow regulating valves. A flow monitoring device 8 is installed on one end of the liquid inlet regulating valve pipe 6 to facilitate controlling the operation rhythm of the overall device;

[0027] A stirring assembly and an ultrasonic generator 9 are arranged inside the ultrasonic reaction pressure tank 5. An anti-interference space is arranged between the stirring assemblies. The stirring assembly includes a turntable 10, a rotating shaft 11, a spiral blade 12, and a servo motor 13. The inner side of the middle of the spiral blade 12 is fixedly sleeved on the surface of one end of the rotating shaft 11. The other end of the rotating shaft 11 is sleeved on the inner side of the top of the ultrasonic reaction pressure tank 5 through a sealing ring and a bearing, and the end of the other end of the rotating shaft 11 is in transmission connection with the output end of the servo motor 13. Thus, the stirring assembly is used to continuously stir to ensure that the low-intensity ultrasonic waves output by the ultrasonic generator 9 are evenly dispersed;

[0028] The working part of the ultrasonic generator 9 is installed inside the ultrasonic reaction pressure tank 5, and the number of ultrasonic generators 9 is not less than two and is evenly distributed on the side walls on both sides of the ultrasonic reaction pressure tank 5. The ultrasonic waves generated by the ultrasonic generator 9 are used to react with the return sludge, so as to enhance the microbial activity and improve the A 2 / O process efficiency for treating PFASs.

[0029] Working principle: During use, the sludge is settled in the secondary sedimentation tank 4 and then undergoes sludge reflux, that is, it enters the inside of the ultrasonic reaction pressure tank 5 through the connecting pipe. To ensure efficiency, the existing sludge pump is also combined with the connecting pipe to achieve the conveying effect. After the sludge enters the inside of the ultrasonic reaction pressure tank 5, the ultrasonic generator 9 is started, and a low-intensity ultrasonic generator outputs ultrasonic waves for ultrasonic action. At the same time, the servo motor 13 is started, and the output end of the servo motor 13 drives the rotating shaft 11 and the spiral blade 12 to continuously stir, so as to ensure the uniform dispersion of the low-intensity ultrasonic waves;

[0030] After a certain period of time, the flow regulating valve in the liquid outlet regulating valve pipe 7 is opened and the pressure inside the ultrasonic reaction pressure tank 5 is adjusted, so that the treated sludge is refluxed and introduced into the anaerobic tank 1 under the action of pressure through the liquid outlet regulating valve pipe 7. Embodiment 2

[0031] Please refer to Figures 1-5 , a device for reducing the inhibitory effect of new pollutants of PFASs on activated sludge microorganisms, including an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a secondary sedimentation tank 4, and an ultrasonic reaction pressure tank 5. A base 14 is welded to the bottom of the ultrasonic reaction pressure tank 5. The top and bottom of the ultrasonic reaction pressure tank 5 are respectively connected with a liquid inlet regulating valve pipe 6 and a liquid outlet regulating valve pipe 7. The water outlet of the anaerobic tank 1 is connected to the water inlet of the anoxic tank 2, the water outlet of the anoxic tank 2 is connected to the water inlet of the aerobic tank 3, and the water outlet of the aerobic tank 3 is connected to the water inlet of the secondary sedimentation tank 4;

[0032] The ultrasonic reaction pressure tank 5 specifically adopts a sealed pressure tank structure, so that the ultrasonicated return sludge can be directly transported into the anaerobic tank 1 under the action of pressure, without additional pumping equipment, reducing the use cost of the overall device;

[0033] The water outlet of the secondary sedimentation tank 4 is connected to one end of the liquid inlet regulating valve pipe 6 through a connecting pipe, and one end of the liquid outlet regulating valve pipe 7 is communicated with the anaerobic tank 1 to form a reflux channel. The valves provided in the liquid inlet regulating valve pipe 6 and the liquid outlet regulating valve pipe 7 are both flow regulating valves. A flow monitoring device 8 is installed on one end of the liquid inlet regulating valve pipe 6 to facilitate controlling the operation rhythm of the overall device;

[0034] The ultrasonic reaction pressure tank 5 is provided with a stirring assembly and an ultrasonic generator 9, and an anti-interference space is provided between the stirring assemblies. The stirring assembly includes a turntable 10, a rotating shaft 11, a spiral blade 12, and a servo motor 13. The inner side of the middle part of the spiral blade 12 is fixedly sleeved on the surface of one end of the rotating shaft 11, and the other end of the rotating shaft 11 is sleeved on the inner side of the top of the ultrasonic reaction pressure tank 5 through a sealing ring and a bearing, and the end of the other end of the rotating shaft 11 is transmission-connected with the output end of the servo motor 13, thereby continuously stirring by using the stirring assembly to ensure that the low-intensity ultrasonic wave output by the ultrasonic generator 9 is evenly dispersed;

[0035] The operating part of the ultrasonic generator 9 is mounted inside the ultrasonic reaction pressure tank 5, and the number of ultrasonic generators 9 is not less than two and is evenly distributed on the side walls of the ultrasonic reaction pressure tank 5. The ultrasonic waves generated by the ultrasonic generator 9 are used to react and treat the return sludge, thereby increasing the A by enhancing the activity of microorganisms. 2 / O process to improve the efficiency of treating PFASs, an outer protective cover 16 is mounted on the outer side of the ultrasonic reaction pressure tank 5, and the outer protective cover 16 covers and protects the ultrasonic generator 9 to prevent other structures in the environment from damaging the ultrasonic generator 9;

[0036] A protective cover frame 15 is mounted on the outer side of the turntable, and the bottom of the protective cover frame 15 is fixedly connected to the bottom inner wall of the ultrasonic reaction pressure tank 5. The protective cover frame 15 is used to share the pressure of the sludge flow on the turntable, thereby preventing the turntable from being damaged and extending its service life.

[0037] Working principle: When in use, the sludge is refluxed after being precipitated in the secondary sedimentation tank 4, that is, it enters the ultrasonic reaction pressure tank 5 through the connecting pipe. In order to ensure efficiency, the existing sludge pump and the connecting pipe are used in combination to achieve the conveying effect. After the sludge enters the ultrasonic reaction pressure tank 5, the ultrasonic generator 9 is started, and the ultrasonic generator 9 outputs a low-intensity ultrasonic generator for ultrasonic action. During the use of the ultrasonic generator 9, the outer protective cover 16 is used for peripheral protection. At the same time, the servo motor 13 is started, and the output end of the servo motor 13 drives the rotating shaft 11 and the spiral blade 12 to continuously stir, so as to ensure that the low-intensity ultrasonic wave is evenly dispersed;

[0038] After a certain period of time, the flow regulating valve in the outlet regulating valve pipe 7 is opened and the internal pressure of the ultrasonic reaction pressure tank 5 is adjusted, so that the treated sludge is refluxed through the outlet regulating valve pipe 7 under pressure and introduced into the interior of the anaerobic tank 1.

Claims

1. A device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms, comprising an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), a secondary sedimentation tank (4) and an ultrasonic reaction pressure tank (5), wherein a base (14) is welded to the bottom of the ultrasonic reaction pressure tank (5), characterized in that: The top and bottom of the ultrasonic reaction pressure tank (5) are respectively connected to a liquid inlet regulating valve pipe (6) and a liquid outlet regulating valve pipe (7); the water outlet of the anaerobic tank (1) is connected to the water inlet of the anoxic tank (2); the water outlet of the anoxic tank (2) is connected to the water inlet of the aerobic tank (3); and the water outlet of the aerobic tank (3) is connected to the water inlet of the secondary sedimentation tank (4); The water outlet of the secondary sedimentation tank (4) is connected to one end of the liquid inlet regulating valve pipe (6) through a connecting pipe, and one end of the liquid outlet regulating valve pipe (7) is connected to the anaerobic tank (1) to form a reflux channel; The ultrasonic reaction pressure tank (5) is provided with a stirring component and an ultrasonic generator (9) inside, and an anti-interference space is provided between the stirring components.

2. A device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms according to claim 1, characterized in that: The valve provided in the liquid inlet regulating valve tube (6) and the valve provided in the liquid outlet regulating valve tube (7) are both flow regulating valves, and a flow monitoring device (8) is installed on one end of the liquid inlet regulating valve tube (6).

3. A device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms according to claim 1, characterized in that: The stirring assembly comprises a rotating disk (10), a rotating shaft (11), a spiral blade (12), and a servo motor (13); the inner side of the middle portion of the spiral blade (12) is fixedly sleeved on the surface of one end of the rotating shaft (11); the other end of the rotating shaft (11) is sleeved on the inner side of the top of the ultrasonic reaction pressure tank (5) via a sealing ring and a bearing; and the end of the other end of the rotating shaft (11) is transmission-connected to the output end of the servo motor (13).

4. The device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms according to claim 1, characterized in that: The operating part of the ultrasonic generator (9) is sleeved inside the ultrasonic reaction pressure tank (5), and the number of ultrasonic generators (9) provided is not less than two and is evenly distributed on the side walls of both sides of the ultrasonic reaction pressure tank (5).

5. The device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms according to claim 1, characterized in that: An outer protective cover (16) is sleeved on the outer side of the ultrasonic reaction pressure tank (5), and the outer protective cover (16) covers and protects the ultrasonic generator (9).

6. The device for reducing the inhibitory effect of PFASs new pollutants on activated sludge microorganisms according to claim 1, characterized in that: The ultrasonic reaction pressure tank (5) specifically adopts a sealed pressure tank structure.

7. The device for reducing the inhibitory effect of PFASs on activated sludge microorganisms according to claim 1, characterized in that: The turntable (10) comprises an annular tube and a turntable. The annular tube is fixedly mounted on the inner wall of the bottom of the ultrasonic reaction pressure tank (5). Three turntables are arranged and are equidistantly mounted on the top of the annular tube.

8. The device for reducing the inhibitory effect of PFASs on activated sludge microorganisms according to claim 7, characterized in that: A protective cover frame (15) is sleeved on the outer side of the rotating disk, and the bottom of the protective cover frame (15) is fixedly connected to the bottom inner wall of the ultrasonic reaction pressure tank (5).

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