Up-flow synchronous denitrification granular sludge reactor with pulse composite propellers

Abstract

The utility model relates to the field of sewage treatment, in particular to a pulse composite propeller up-flow synchronous denitrification granular sludge reactor. The pulse composite propeller up-flow synchronous denitrification granular sludge reactor comprises a reactor main body, the water inlet and pulse water distribution assembly comprises a water inlet pipeline communicated with the interior of the reactor main body, a pulse generator mounted on the water inlet pipeline and a pulse water distribution pipe arranged at the end part of the water inlet pipeline; the pulse water distribution pipes are uniformly arranged in the reactor main body in the circumferential direction of the reactor main body in an odd number; the hydraulic spiral assembly comprises a driving turbine and a propeller connected with the driving turbine, and an outlet of the pulse water distribution pipe faces the driving turbine. According to the up-flow type synchronous denitrification granular sludge reactor with the pulse composite propellers, the granular sludge can be prevented from being accumulated and hardened at the bottom through the water inlet and pulse water distribution assembly and the hydraulic spiral assembly, and the denitrification reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a pulse composite propeller upflow type synchronous denitrification granular sludge reactor. Background Art

[0002] Traditional biological denitrification technology faces the problems of consuming a lot of energy for aeration, consuming a lot of organic matter for microbial heterotrophic metabolism, and producing excessive residual sludge, resulting in large carbon emissions. With the further improvement of sewage discharge standards, the proposal of dual carbon goals and the need for energy conservation and consumption reduction, new sewage treatment technologies are urgently needed to solve the above problems. Short-range denitrification coupled anaerobic ammonia oxidation process, namely PD / A process, provides a new direction for the upgrading and transformation of biological denitrification technology. Short-range denitrification can reduce nitrate to nitrite, providing a stable reaction substrate for anaerobic ammonia oxidation. While anaerobic ammonia oxidation generates nitrogen, its byproduct nitrate re-enters the short-range denitrification reaction to complete the closed cycle of the denitrification process. Therefore, in theory, the PD / A process can achieve complete denitrification of sewage with a low carbon-nitrogen ratio. According to existing research results, the total nitrogen removal rate of the PD / A process can reach more than 80%, which can reduce 48% of oxygen consumption, 54% of organic matter consumption and 66% of sludge production compared with the traditional nitrification-denitrification denitrification process. Therefore, the PD / A process has good development potential and application prospects.

[0003] The existing PD / A process has various types of reaction devices, which are divided into two types: integrated and segmented. The integrated ones are mainly ordered batch reactors (SBR) and upflow sludge blanket reactors (UASB); SBR needs to be operated intermittently, which hinders its promotion and application in engineering; UASB, as the most common continuous flow bioreactor, has the characteristics of small footprint, high nitrogen load, low operating cost, and convenient operation. The device structure is conducive to the formation of granular sludge, protecting microorganisms from environmental changes and achieving stable denitrification. Therefore, UASB has become a commonly used reaction device in PDA process. However, in the actual operation process, it is found that granular sludge is easy to accumulate and compact at the bottom for anaerobic reaction and even cause particle disintegration, and short-circuit phenomenon is easy to occur during the rising process of water flow, resulting in obstruction of mass transfer process, which is not conducive to the domestication and maintenance of PD / A microbial flora, causing imbalance of biological system and affecting the denitrification efficiency in the reactor.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to improve or solve the technical problem in the prior art that granular sludge is prone to accumulation and hardening at the bottom of the reactor, the utility model provides a pulse compound propeller upflow synchronous denitrification granular sludge reactor. The pulse compound propeller upflow synchronous denitrification granular sludge reactor includes a reactor body; a water inlet and pulse water distribution assembly, including a water inlet pipe connected to the inside of the reactor body, a pulse generator installed on the water inlet pipe, and a pulse water distribution pipe arranged at the end of the water inlet pipe; the pulse water distribution pipe is arranged in the reactor body and is evenly arranged in an odd number along the circumference of the reactor body; a hydraulic screw assembly is arranged in the reactor body and located at the bottom of the reactor body; the hydraulic screw assembly includes a driving turbine and a propeller connected to the driving turbine, and the outlet of the pulse water distribution pipe faces the driving turbine.

[0006] The utility model pulse composite propeller upflow synchronous denitrification granular sludge reactor comprises a reactor body, a water inlet and pulse water distribution component and a hydraulic screw component. Among them, the reactor body provides space for denitrification reaction. The water inlet and pulse water distribution component transports sewage into the reactor body. The water inlet and pulse water distribution component comprises a water inlet pipe, a pulse generator and a pulse water distribution pipe. Through the pulse generator and the pulse water distribution pipe, the medium in the reactor body is intermittently oscillated, the medium movement frequency is increased, the sludge is kept in a suspended state, and the granular sludge is prevented from accumulating and hardening at the bottom. The hydraulic screw component comprises a driving turbine and a propeller, and the opening of the pulse water distribution pipe faces the driving turbine. The driving turbine rotates under the hydraulic impact of the pulse water distribution pipe, and then drives the propeller to rotate, so that the water flow spirals up in the reactor, and the bottom presents a circulating flow state, and the medium is stirred to keep the granular sludge at the bottom in a moving state, and the flocculent sludge in the middle section is kept in a suspended state, thereby improving the denitrification reaction efficiency, and at the same time increasing the probability of particle collision in the reactor to promote the growth of granular sludge. Through the above-mentioned settings, the pulse composite propeller upflow synchronous denitrification granular sludge reactor of the utility model can prevent the granular sludge from accumulating and compacting at the bottom through the water inlet and pulse water distribution components and the hydraulic screw components, enhance the mixing performance between sewage and granular sludge, strengthen the mass transfer rate of pollutants, organic matter, etc. between water bodies and microorganisms, and improve the denitrification reaction efficiency; at the same time, the water inlet impact pressure generated by the water inlet and pulse water distribution components can drive the drive turbine to rotate, and then drive the propeller to rotate, without the need for external power drive, saving energy, and overcoming the maintenance difficulty of conventional electric drive devices.

[0007] In the preferred technical solution of the above-mentioned pulse compound propeller upflow synchronous denitrification granular sludge reactor, the propeller includes a connecting portion connected to the driving turbine, and a plurality of blades uniformly and spacedly arranged along the circumference of the connecting portion.

[0008] In the preferred technical solution of the pulse compound propeller upflow synchronous denitrification granular sludge reactor, the blade forms a first angle with the plane where the connecting portion is located, and the angle range of the first angle is 20°-40°. Through the above-mentioned setting, the inclination angle is 20°-40°, which can produce severe water flow disturbance at a relatively low power, and the turbulence in the flow field is optimal, which can enhance the suspended motion of granular sludge and promote the uniform distribution of the concentration of the suspended medium. At the same time, it affects the push motion, effectively reduces the probability of granular sludge accumulation at the bottom of the reactor, and enhances the radial circulation of water flow under the blade, effectively eliminating the "dead water area" at the bottom, and improving the mixing effect at the bottom.

[0009] In the preferred technical solution of the pulse compound propeller upflow synchronous denitrification granular sludge reactor, it also includes a three-phase separation component installed in the reactor body, and a circulating water inlet is arranged on the three-phase separation component; the water inlet and pulse water distribution component also includes a circulating pipe connecting the circulating water inlet and the water inlet pipe, and a circulating pump installed on the circulating pipe, and the intersection of the circulating pipe and the water inlet pipe is located on the side of the pulse generator away from the reactor body. Through the above arrangement, the liquid separated by the three-phase separation component is transported to the water inlet pipe through the circulating pipe, so as to realize the recycling of the liquid.

[0010] In the preferred technical solution of the pulse compound propeller upflow synchronous denitrification granular sludge reactor, a circulation flowmeter is installed on the circulation pipeline; an inlet flowmeter is arranged on the inlet pipeline, and the inlet flowmeter and the pulse generator are respectively located on both sides of the intersection of the circulation pipeline and the inlet pipeline. Through the above settings, the circulation flowmeter is used to control the flow of the circulating liquid in the circulation pipeline; the inlet flowmeter is used to control the flow of the liquid transported from the outside to the inlet and pulse water distribution components.

[0011] In the preferred technical scheme of the above-mentioned pulse compound propeller upflow synchronous denitrification granular sludge reactor, it also includes a carbon source addition component, which includes a carbon source storage tank, a carbon source addition pipeline connecting the carbon source storage tank and the water inlet pipeline, a carbon source addition pump installed on the carbon source addition pipeline, and an addition flow meter installed on the carbon source addition pipeline.

[0012] In the preferred technical solution of the above-mentioned pulse compound propeller upflow synchronous denitrification granular sludge reactor, the intersection of the carbon source addition pipeline and the water inlet pipeline is located between the pulse generator and the pulse water distribution pipe.

[0013] In the preferred technical solution of the above-mentioned pulse compound propeller upflow synchronous denitrification granular sludge reactor, a water outlet pipe and an air outlet pipe for discharging the gas generated by the reaction are also provided on the reactor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0015] Figure 1 It is a schematic diagram of an embodiment of the pulse compound propeller upflow synchronous denitrification granular sludge reactor of the utility model.

[0016] Figure 2 It is a schematic diagram of a driving turbine in a pulse compound propeller upflow synchronous denitrification granular sludge reactor of the utility model.

[0017] Figure 3 It is a schematic diagram of a propeller in a pulse composite propeller upflow synchronous denitrification granular sludge reactor of the utility model.

[0018] List of reference numerals: 1. Reactor body; 11. Water outlet pipe; 12. Air outlet pipe; 21. Water inlet pipe; 22. Pulse generator; 23. Pulse water distribution pipe; 24. Water inlet pump; 25. Circulation pipe; 26. Circulation pump; 27. Water inlet flow meter; 28. Circulation flow meter; 31. Driving turbine; 32. Propeller; 321. Connecting part; 322. Blade; 4. Three-phase separation component; 51. Carbon source storage tank; 52. Carbon source addition pipe; 53. Carbon source addition pump; 54. Addition flow meter. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0020] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In order to improve or solve the technical problem that granular sludge is easy to accumulate and harden at the bottom of the reactor in the prior art, the utility model provides a pulse compound propeller upflow synchronous denitrification granular sludge reactor. The pulse compound propeller upflow synchronous denitrification granular sludge reactor includes a reactor body 1; a water inlet and pulse water distribution assembly, including a water inlet pipe 21 connected to the inside of the reactor body 1, a pulse generator 22 installed on the water inlet pipe 21, and a pulse water distribution pipe 23 arranged at the end of the water inlet pipe 21; the pulse water distribution pipe 23 is arranged in the reactor body 1 and is evenly arranged in an odd number along the circumference of the reactor body 1; a hydraulic screw assembly is arranged in the reactor body 1 and located at the bottom of the reactor body 1; the hydraulic screw assembly includes a driving turbine 31 and a propeller 32 connected to the driving turbine 31, and the outlet of the pulse water distribution pipe 23 faces the driving turbine 31.

[0023] Figure 1 Schematic diagram of an embodiment of the pulse compound propeller upflow synchronous denitrification granular sludge reactor of the utility model. Figure 1 As shown, in one or more embodiments, the pulse composite propeller upflow synchronous denitrification granular sludge reactor of the utility model includes a reactor body 1, a water inlet and pulse water distribution component, a carbon source addition component, a hydraulic screw component and a three-phase separation component 4.

[0024] Continue to see Figure 1 In one or more embodiments, the reactor body 1 is a hollow cylindrical structure with a height-to-diameter ratio of 2-5:1. A water outlet pipe 11 and an air outlet pipe 12 are provided at the top of the reactor body 1. Specifically, a water collecting tank is provided on the inner wall of the reactor body 1, and the water collecting tank is connected to the water outlet pipe 11. An exhaust port is provided at the top of the reactor body 1, and the exhaust port is sealed and connected to the air outlet pipe 12 for discharging the gas generated by the reaction, and a breathing valve is provided on the air outlet pipe 12.

[0025] Continue to see Figure 1In one or more embodiments, the water inlet and pulse water distribution assembly includes a water inlet pipe 21 connected to the inside of the reactor body 1, a pulse generator 22 installed on the water inlet pipe 21, and a pulse water distribution pipe 23 arranged at the end of the water inlet pipe 21. The pulse water distribution pipe 23 is arranged on the inner wall of the reactor body 1. Further, at least three pulse water distribution pipes 23 are provided, and the three pulse water distribution pipes 23 are arranged uniformly and spaced along the circumference of the reactor body 1. Preferably, the pulse water distribution pipes 23 are arranged in an odd number. Further, a water inlet pump 24 is provided on the water inlet pipe 21 to drive the raw water to flow in the water inlet pipe 21. Further, a water inlet flowmeter 27 is arranged between the water inlet pipe 21 and the pulse generator 22, and the water inlet flowmeter 27 is used to control the flow of liquid transported from the outside to the water inlet pipe 21. Further, a circulating water inlet is provided on the three-phase separation component 4. The water inlet and pulse water distribution assembly also includes a circulation pipe 25 connecting the circulating water inlet and the water inlet pipe 21, and a circulation pump 26 installed on the circulation pipe 25. The liquid separated by the three-phase separation assembly 4 is transported to the water inlet pipe 21 again through the circulation pipe 25. Furthermore, the intersection of the circulation pipe 25 and the water inlet pipe 21 is located on the side of the pulse generator 22 away from the reactor body 1. Specifically, the intersection of the circulation pipe 25 and the water inlet pipe 21 is located between the water inlet flowmeter 27 and the pulse generator 22. The circulating liquid in the circulation pipe 25 is combined with the raw water in the water inlet pipe 21 and then transported to the pulse generator 22. Furthermore, a circulation flowmeter 28 is arranged on the circulation pipe 25, and the circulation flowmeter 28 is used to control the flow rate of the circulating liquid transported from the circulation pipe 25 to the water inlet pipe 21.

[0026] Continue to see Figure 1 In one or more embodiments, the carbon source dosing assembly includes a carbon source storage tank 51, a carbon source dosing pipeline 52 connecting the carbon source storage tank 51 and the water inlet pipeline 21, a carbon source dosing pump 53 arranged on the carbon source dosing pipeline 52, and a dosing flowmeter 54 installed on the carbon source dosing pipeline 52. Specifically, the carbon source storage tank 51 stores a carbon source. The intersection of the carbon source dosing pipeline 52 and the water inlet pipeline 21 is located between the pulse generator 22 and the pulse water distribution pipe 23. The carbon source in the carbon source storage tank 51 is combined with the raw water in the water inlet pipeline 21 and the circulating liquid in the circulating pipeline 25 and then transported to the pulse water distribution pipe 23.

[0027] Continue to see Figure 1 In one or more embodiments, the three-phase separation component 4 is arranged in the reactor body 1, and is located in the middle and upper part of the reactor body 1. The three-phase separation component 4 is a finished device, and is provided with at least two layers, which will not be described in detail here.

[0028] Figure 2 This is a schematic diagram of the driving turbine in the pulse compound propeller upflow synchronous denitrification granular sludge reactor of the utility model. Figure 3 This is a schematic diagram of the propeller in the pulse composite propeller upflow synchronous denitrification granular sludge reactor of the utility model. Figures 1 to 3 As shown, in one or more embodiments, the hydraulic screw assembly is arranged in the reactor body 1 and is located at the bottom of the reactor body 1. The hydraulic screw assembly includes a driving turbine 31 and a propeller 32 connected to the driving turbine 31. Specifically, a bottom bearing can be provided at the bottom of the reactor body 1, a bracket can be provided at the middle and lower position of the reactor body 1, and a top bearing opposite to the bottom bearing can be provided on the bracket; at the same time, a rotating shaft running through the driving turbine 31 and the propeller 32 is provided, and the two ends of the rotating shaft are respectively provided in the bottom bearing and the top bearing, so as to realize the rotation of the driving turbine 31 and the propeller 32 in the reactor body 1. Further, the outlet of the pulse water distribution pipe 23 faces the driving turbine 31, so that when the pulse generator 22 oscillates, the driving turbine 31 is driven to rotate, and then the propeller 32 is driven to rotate. Further, the propeller 32 includes a connecting portion 321 connected to the driving turbine 31, and a plurality of blades 322 arranged uniformly and spaced along the circumference of the connecting portion 321. Specifically, the connecting portion 321 is roughly in the shape of a round pancake, and four blades 322 are evenly arranged along the circumference of the connecting portion 321. Further, the blades 322 form a first angle with the plane where the connecting portion 321 is located, and the angle range of the first angle is 20°-40°. Preferably, the first angle is 30°. Specifically, based on Figure 1 In the orientation shown, the first angle refers to the angle between the blade 322 and the horizontal plane where the connecting portion 321 is located. When the inclination angle is 20°-40° and the stirring speed is 1-5rpm, a violent water flow disturbance can be generated at the minimum input power, and the turbulence in the flow field is optimal, which can enhance the suspended motion of granular sludge, promote the uniform distribution of suspended solid concentration, and affect the push motion, reduce the probability of granular sludge accumulation at the bottom of the reactor, enhance the radial circulation of water flow under the blade 322, effectively eliminate the "dead water area" at the bottom, and improve the mixing effect at the bottom. At the same time, as the blades 322 rotate, the fluid can be fully exchanged up and down in the reactor body 1, effectively promoting the circulation of the fluid, strengthening the convective mass transfer and molecular diffusion, improving the system denitrification efficiency, strengthening macroscopic mixing, and increasing the overall turbulence level in the reactor. Under high shear force, the metabolic pathway of microorganisms changes, and a large amount of highly viscous polysaccharides are produced, which increases the collision probability of particles and flocs, and is conducive to the adsorption between floc microorganisms and nuclei. In addition, the physical and chemical reaction on the surface of the nucleated particles is active, and they have electric charge and water chemical properties. The fine flocculent sludge in the water flow can easily combine with each other, thereby promoting the growth of granular sludge.

[0029] So far, the technical scheme of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical schemes after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A pulse compound propeller upflow synchronous denitrification granular sludge reactor, characterized in that: include: Reactor body (1); A water inlet and pulse water distribution assembly, comprising a water inlet pipe (21) in communication with the interior of the reactor body (1), a pulse generator (22) mounted on the water inlet pipe (21), and a pulse water distribution pipe (23) arranged at the end of the water inlet pipe (21); the pulse water distribution pipe (23) is arranged in the reactor body (1) and is evenly arranged in odd numbers along the circumference of the reactor body (1); A hydraulic screw assembly is arranged in the reactor body (1) and located at the bottom of the reactor body (1); the hydraulic screw assembly includes a driving turbine (31) and a propeller (32) connected to the driving turbine (31), and the outlet of the pulse water distribution pipe (23) faces the driving turbine (31).

2. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 1 is characterized in that: The propeller (32) comprises a connection portion (321) connected to the driving turbine (31), and a plurality of blades (322) arranged evenly and at intervals along the circumference of the connection portion (321).

3. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 2 is characterized in that: The blade (322) and the plane where the connecting portion (321) is located form a first angle, and the angle range of the first angle is 20°-40°.

4. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 1, characterized in that: It also includes a three-phase separation component (4) installed in the reactor body (1), and a circulating water inlet is arranged on the three-phase separation component (4); the water inlet and pulse water distribution component also includes a circulating pipe (25) connecting the circulating water inlet and the water inlet pipe (21), and a circulating pump (26) installed on the circulating pipe (25), and the intersection of the circulating pipe (25) and the water inlet pipe (21) is located on the side of the pulse generator (22) away from the reactor body (1).

5. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 4 is characterized in that: A circulation flow meter (28) is installed on the circulation pipeline (25); a water inlet flow meter (27) is arranged on the water inlet pipeline (21); the water inlet flow meter (27) and the pulse generator (22) are respectively located on both sides of the intersection of the circulation pipeline (25) and the water inlet pipeline (21).

6. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 1, characterized in that: The invention also comprises a carbon source dosing component, wherein the carbon source dosing component comprises a carbon source storage tank (51), a carbon source dosing pipeline (52) connecting the carbon source storage tank (51) and the water inlet pipeline (21), a carbon source dosing pump (53) installed on the carbon source dosing pipeline (52), and a dosing flow meter (54) installed on the carbon source dosing pipeline (52).

7. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 6, characterized in that: The intersection of the carbon source addition pipeline (52) and the water inlet pipeline (21) is located between the pulse generator (22) and the pulse water distribution pipe (23).

8. The pulse compound propeller upflow synchronous denitrification granular sludge reactor according to claim 1, characterized in that: The reactor body (1) is also provided with a water outlet pipe (11) and a gas outlet pipe (12) for discharging gas generated by the reaction.

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