Device for rapidly forming denitrifying granular sludge

Abstract

The utility model discloses a device for rapidly forming denitrifying granular sludge, which is characterized in that a reaction tank water outlet on the side surface of the top of a reaction tank is communicated with an inlet of a secondary sedimentation tank, a membrane component and a stirring device are arranged in the reaction tank, and granular sludge is filled in the reaction tank, the granular sludge and blades of the stirring device are positioned below the membrane component, and the water outlet of the reaction tank is positioned above the membrane component; an inclined plate is arranged on the side face of the bottom of the secondary sedimentation tank, a secondary sedimentation tank water outlet in the side face of the top of the secondary sedimentation tank is communicated with an inlet of a water inlet backflow pipe through a water outlet backflow pipe, a waste water inlet is communicated with the inlet of the water inlet backflow pipe, and a dosing port is communicated with the inlet of the water inlet backflow pipe. And a reaction tank water inlet of the water inlet return pipe is inserted into the bottom of the reaction tank. The device can quickly form denitrifying granular sludge.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater treatment technical field relates to a device of denitrification granular sludge rapid formation. BACKGROUND

[0002] High nitrate industrial wastewater refers to the wastewater discharged in the industrial production process containing high concentration of nitrate (NO3 - N). This kind of wastewater mainly comes from the industrial fields such as chemical fertilizer production, metal surface treatment, electroplating, petroleum processing, pharmaceuticals, etc. Excessive discharge of nitrate will lead to water eutrophication, aquatic organism death, water quality deterioration and other environmental problems, which pose a threat to the ecological environment and human health. Granular sludge is a kind of biomass, which plays an important role in wastewater treatment. Its advantages include good settling performance, high-efficiency biodegradation, strong impact resistance, simple operation and maintenance, and the ability to maintain a high concentration of microorganisms in the biological reactor. In terms of treating high-concentration industrial wastewater and domestic sewage, granular sludge process has the characteristics of saving land area, saving cost and environmental protection benefit, so it has broad market prospects in the field of industrial wastewater and municipal wastewater treatment. SUMMARY

[0003] The utility model discloses a device of denitrification granular sludge rapid formation, which can quickly form denitrification granular sludge.

[0004] To achieve the above object, the utility model discloses a device of denitrification granular sludge rapid formation, including reaction pool, two sedimentation tanks, outlet water return pipe, inlet water return pipe, wastewater inlet and dosing port;

[0005] The outlet water port on the side surface of the top of the reaction pool is connected with the inlet of the two sedimentation tanks, and the membrane assembly and the stirring device are arranged in the reaction pool. The reaction pool is filled with granular sludge, and the granular sludge and the blades of the stirring device are located below the membrane assembly, and the outlet water port of the reaction pool is located above the membrane assembly.

[0006] The side surface of the bottom of the two sedimentation tanks is provided with an inclined plate, the outlet water port on the side surface of the top of the two sedimentation tanks is connected with the inlet of the inlet water return pipe through the outlet water return pipe, the wastewater inlet is connected with the inlet of the inlet water return pipe, the dosing port is connected with the inlet of the inlet water return pipe, and the reaction pool inlet of the inlet water return pipe is inserted into the bottom of the reaction pool.

[0007] As a further improvement of the device of denitrification granular sludge rapid formation according to the utility model, the reaction pool is provided with a sludge discharge port.

[0008] Further, the bottom of the reaction pool is provided with a sludge discharge port.

[0009] Further, the membrane assembly is located at a position of three quarters of the height of the reaction tank.

[0010] Further, the inclination angle of the inclined plate is 60°.

[0011] Further, 40% of the water in the secondary sedimentation tank outlet enters the water outlet return pipe.

[0012] Further, the filter membrane pore size of the membrane assembly is 0.05mm.

[0013] The utility model has the following beneficial effects:

[0014] The device for quickly forming denitrification granular sludge in the utility model is operated as follows: the granular sludge and the blades of the stirring device are located below the membrane assembly, the reaction tank outlet is located above the membrane assembly, the granular sludge is intercepted at the bottom of the reaction tank through the membrane assembly, so that the granular sludge is prevented from being washed out of the reaction tank, the denitrification granular sludge is quickly formed, in addition, the stirring device is used for stirring, the channeling and wall flow phenomena in the initial stage of the formation of the granular sludge are effectively solved, the problems of short flow of the wastewater and poor treatment effect are avoided, and the sludge hardening and the caking of the denitrification granular sludge are also prevented. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, and do not constitute an improper limitation on the utility model. In the drawings:

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] In the drawings, 1 is a reaction tank outlet, 2 is granular sludge, 3 is a secondary sedimentation tank, 4 is a reaction tank, 5 is a wastewater inlet, 6 is a dosing port, 7 is a sludge discharge port, 8 is a stirring device, 9 is a reaction tank inlet, 10 is a water inlet return pipe, 11 is a membrane assembly, 12 is a blade, 13 is a secondary sedimentation tank outlet, 14 is a water outlet return pipe, and 15 is an inclined plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] In the description of the utility model, it is understood that the terms "comprising" and "including" indicate the presence of described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or its set.

[0020] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless otherwise clear from the context, the singular forms "a", "an" and "the" are intended to include plural forms.

[0021] It should be further understood that the term "and / or" used in the utility model specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations, for example, A and / or B can represent three cases of A alone, A and B exist simultaneously, and B alone. In addition, the character " / " in the utility model generally represents that the front and rear associated objects are in an "or" relationship.

[0022] It should be understood that although the terms first, second, third, etc. may be used in the utility model embodiments to describe the preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range without departing from the scope of the utility model embodiments, and similarly, the second preset range can also be referred to as the first preset range.

[0023] Depending on the context, the word "if" as used herein can be interpreted as meaning "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0025] Various structural schematic diagrams according to the disclosed embodiments of the utility model are shown in the drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and certain details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0026] Embodiment one

[0027] The device for rapid formation of denitrification granular sludge provided by the utility model comprises a reaction tank 4, a secondary sedimentation tank 3, a water outlet backflow pipe 14, a water inlet backflow pipe 10, a wastewater inlet 5 and a dosing port 6. The water outlet of the reaction tank 4 on the top side of the reaction tank 4 is connected with the inlet of the secondary sedimentation tank 3. A membrane assembly 11 and a stirring device 8 are arranged in the reaction tank 4. The reaction tank 4 is filled with granular sludge 1. The granular sludge 1 and the blades 12 of the stirring device 8 are located below the membrane assembly 11, and the water outlet of the reaction tank 4 is located above the membrane assembly 11. An inclined plate 15 is arranged on the side of the bottom of the secondary sedimentation tank 3. The water outlet of the secondary sedimentation tank 3 on the top side of the secondary sedimentation tank 3 is connected with the inlet of the water inlet backflow pipe 10 through the water outlet backflow pipe 14. The wastewater inlet 5 is connected with the inlet of the water inlet backflow pipe 10. The dosing port 6 is connected with the inlet of the water inlet backflow pipe 10. The water inlet of the reaction tank 10 is inserted into the bottom of the reaction tank 4.

[0028] The working process of the utility model is as follows:

[0029] The waste water is mixed with aluminum sulfate in the dosing port 6 at the waste water inlet 5, mixed with the backflow water, and then enters the bottom of the reaction tank 4, and is uniformly mixed with the granular sludge 1 under the action of the stirring device 8. The waste water and the granular sludge 1 in the reaction tank 4 are fully reacted, the granular sludge 1 cannot pass through the membrane assembly 11 and is intercepted at the bottom of the reaction tank 4, the treated waste water is discharged into the secondary sedimentation tank 3 through the reaction tank outlet 1, and the waste water in the secondary sedimentation tank 3 is separated into sludge and water through the action of the inclined plate 15. The upper clear liquid is divided into two paths after passing through the secondary sedimentation tank outlet 13 of the secondary sedimentation tank 3, one of which enters the water inlet backflow pipe 10, and the other of which is discharged.

[0030] Example two

[0031] Reference Figure 1 The device for quickly forming the denitrification granular sludge comprises a reaction tank outlet 1, a granular sludge 1, a secondary sedimentation tank 3, a reaction tank 4, a waste water inlet 5, a dosing port 6, a sludge discharge port 7, a stirring device 8, a reaction tank inlet 9, a water inlet backflow pipe 10, a membrane assembly 11, a blade 12, a secondary sedimentation tank outlet 13, a water outlet backflow pipe 14 and an inclined plate 15.

[0032] The bottom of the reaction tank 4 is provided with the sludge discharge port 7, the reaction tank outlet 1 on the top side of the reaction tank 4 is in communication with the inlet of the secondary sedimentation tank 3, the membrane assembly 11 and the stirring device 8 are arranged in the reaction tank 4, and the reaction tank 4 is filled with the granular sludge 1, wherein the granular sludge 1 and the blade 12 of the stirring device 8 are located below the membrane assembly 11, and the reaction tank outlet 1 is located above the membrane assembly 11.

[0033] The side of the bottom of the secondary sedimentation tank 3 is provided with the inclined plate 15, the secondary sedimentation tank outlet 13 on the top side of the secondary sedimentation tank 3 is in communication with the inlet of the water outlet backflow pipe 14 and the water inlet backflow pipe 10, the waste water inlet 5 is in communication with the inlet of the water inlet backflow pipe 10, the dosing port 6 is in communication with the inlet of the water inlet backflow pipe 10, and the reaction tank inlet 9 of the water inlet backflow pipe 10 is inserted into the bottom of the reaction tank 4.

[0034] The membrane assembly 11 is located at a position of three quarters of the height of the reaction tank 4, the filter membrane pore size of the membrane assembly 11 is 0.05 mm, the membrane assembly 11 is used for intercepting the granular sludge 1 at the bottom of the reaction tank 4, and the granular sludge 1 is prevented from being washed out of the reaction tank 4. 40% of the water outlet in the secondary sedimentation tank outlet 13 of the secondary sedimentation tank 3 enters the water outlet backflow pipe 14.

[0035] The inclination angle of the inclined plate 15 is 60°.

[0036] The working process of the device for quickly forming the denitrification granular sludge is as follows:

[0037] The waste water is mixed with aluminum sulfate in the dosing port 6 at the waste water inlet 5 and mixed with 40% backflow water, and then enters the bottom of the reaction tank 4, and is uniformly mixed with the granular sludge 1 under the action of the stirring device 8. The waste water in the reaction tank 4 and the granular sludge 1 are fully reacted, the granular sludge 1 cannot pass through the membrane assembly 11 and is intercepted at the bottom of the reaction tank 4, and part of the sludge is discharged through the sludge discharge port 7. The treated waste water is discharged into the secondary sedimentation tank 3 through the reaction tank outlet 1, and the waste water in the secondary sedimentation tank 3 is separated from the sludge through the action of the inclined plate 15. The upper clear liquid is divided into two ways after passing through the secondary sedimentation tank outlet 13 of the secondary sedimentation tank 3, one of which enters the water inlet backflow pipe 10, and the other is discharged. The stirring device 8 uniformly mixes the waste water and the granular sludge 1 in the reaction tank 4, which is used to solve the channeling and wall flow phenomenon of the granular sludge 1 in the initial stage, so that the waste water is short-circuited and the treatment effect is poor. The problem can be solved, and the sludge is also solved and the denitrification granular sludge 1 is also solved.

[0038] The conventional activated sludge process has the problems of low denitrification load in removing nitrate nitrogen in waste water, and is easily affected by factors such as temperature and pH value, and needs a long start-up and running period, and may cause problems such as sludge hardening and caking. The filter membrane separation technology is adopted in the utility model, the granular sludge 1 is effectively controlled at the bottom of the reaction tank 4, and the treatment efficiency and separation effect are improved; at the same time, the channeling and wall flow phenomenon of the granular sludge 1 in the initial stage are solved through the stirring device 8, the problems of waste water short-circuiting and poor treatment effect are avoided, the operation is simple, and industrial production and on-site application are easy, so that the efficiency and effect of sewage treatment are significantly improved.

[0039] The granular sludge 1 cultivated in the utility model has excellent performance in various indexes. Firstly, the MLVSS content of the granular sludge 1 is 29.6-30.1 g / L, and the treatment efficiency is improved; secondly, the VSS / SS ratio is 0.34-0.36, and the activity of the granular sludge 1 is relatively strong; in addition, the SVI5 / SVI30 ratio is 0.95-0.97, and the settling performance of the granular sludge 1 is better. The microbial amount in the granular sludge 1 is greatly increased, and the extracellular polymer content is also high, and the LB-EPS and TB-EPS contents are 23.62 mg / g and 45.19 mg / g respectively, which all help to improve the efficiency and stability of the sewage treatment system.

[0040] In addition, in the utility model, after the sewage is mixed with the medicine, the medicine and the granular sludge 1 in the reaction tank 4 are fully reacted, the formation of the granular sludge 1 is accelerated, so that the waste water is more effectively treated, and the treated sewage is separated from the sludge through the secondary sedimentation tank 3, so that the waste water is effectively treated, and the denitrification load reaches 15.20-17.12 kg NO3 - -N / (m 3·d), the influent nitrate concentration is 1000-1200 mg / L, the effluent nitrate concentration is below 5 mg / L, and the HRT is 6 h.

[0041] Embodiment three

[0042] In this embodiment, the reaction tank 4 is a cuboid structure with a length of 50 cm, a width of 50 cm, and a height of 60 cm; the bottom length of the secondary sedimentation tank 3 is 20 cm, the top length of the secondary sedimentation tank 3 is 30 cm, the width of the secondary sedimentation tank 3 is 50 cm, and the height of the secondary sedimentation tank 3 is 60 cm; and the processing object is simulated wastewater.

[0043] The device is operated for 190 days, and the denitrifying granular sludge 1 is formed in 19 days, and the mature stable period is reached in 30 days, the particle size is 1.5-4.5 mm, and the color is yellow-brown. The influent nitrate concentration of the device is 1000-1200 mg / L, the effluent nitrate concentration is stably below 5 mg / L, the denitrification volume load is 15.20-17.12 kgNO3 - -N / (m 3 ·d), so it can be seen that the device has good denitrification effect, and the nitrate removal rate can reach more than 99%.

[0044] Those skilled in the art will readily conceive other embodiments of the device after considering the specification and disclosure of the device. The present application is intended to cover any variations, uses, or adaptations of the device that follow the general principles of the device and include common knowledge or conventional technical means in the technical field of the device that are not disclosed by the device. The specification and examples are only considered as exemplary, and the true scope and spirit of the device are indicated by the following claims.

[0045] It should be understood that the device is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the device is only limited by the appended claims.

[0046] The above is only the preferred embodiment of the device, and does not limit the device in any way, and any simple modification, change, and equivalent structural change according to the technical essence of the device are still within the protection scope of the technical solution of the device.

Claims

1. A device for rapid formation of denitrifying granular sludge, characterized in that, It includes a reaction tank (4), a secondary sedimentation tank (3), an effluent return pipe (14), an influent return pipe (10), a wastewater inlet (5), and a chemical dosing port (6); The reaction tank outlet (1) on the top side of the reaction tank (4) is connected to the inlet of the secondary sedimentation tank (3). The reaction tank (4) is equipped with a membrane module (11) and a stirring device (8). The reaction tank (4) is filled with granular sludge (2). The granular sludge (2) and the blades (12) of the stirring device (8) are located below the membrane module (11), and the reaction tank outlet (1) is located above the membrane module (11). An inclined plate (15) is provided on the side of the bottom of the secondary sedimentation tank (3). The outlet (13) of the secondary sedimentation tank on the top side of the secondary sedimentation tank (3) is connected to the inlet of the inlet return pipe (10) via the outlet return pipe (14). The wastewater inlet (5) is connected to the inlet of the inlet return pipe (10). The dosing port (6) is connected to the inlet of the inlet return pipe (10). The reaction tank inlet (9) of the inlet return pipe (10) is inserted into the bottom of the reaction tank (4).

2. The apparatus for rapid formation of denitrifying granular sludge according to claim 1, characterized in that, The bottom of the reaction tank (4) is provided with a sludge discharge port (7).

3. The apparatus for rapid formation of denitrifying granular sludge according to claim 1, characterized in that, The membrane module (11) is located at three-quarters of the height inside the reaction tank (4).

4. The apparatus for rapid formation of denitrifying granular sludge according to claim 1, characterized in that, The tilt angle of the inclined plate (15) is 60°.

5. The apparatus for rapid formation of denitrifying granular sludge according to claim 1, characterized in that, 40% of the water effluent from the outlet (13) of the secondary sedimentation tank (3) enters the effluent return pipe (14).

6. The apparatus for rapid formation of denitrifying granular sludge according to claim 1, characterized in that, The filter membrane pore size of the membrane module (11) is 0.05 mm.

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