A sludge optimization device and a denitrification system having the same

Abstract

This invention relates to the technical field of wastewater treatment, and more specifically, to a sludge optimization device and a denitrification system therein. The device includes a tank and a sludge discharge hopper connected to the bottom of the tank. A sludge inlet pipe is connected to the side of the tank, and a sludge outlet pipe is connected to the top of the tank. A centrifugal assembly for separating non-microbial impurities is provided inside the tank. The sludge inlet pipe is located above the centrifugal assembly, and the non-microbial impurities sink to the sludge discharge hopper. A sludge discharge assembly is located at the bottom of the sludge discharge hopper. The sludge optimization device of this invention utilizes the centrifugal force of the centrifugal assembly to separate heavier non-microbial impurities from the sludge, reducing the content of non-microbial impurities in the sludge and improving sludge activity. The denitrification system of this invention, due to the reduced content of non-microbial impurities and increased sludge activity in the returned sludge to the biological treatment tank, improves the treatment capacity of the biological treatment tank and effectively improves the denitrification effect of wastewater with a low C / N ratio.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to a sludge optimization device and a denitrification system having the same. Background Art

[0002] With the rapid growth of social economy and the improvement of the average living standard of residents, urbanization has been rapidly promoted, the discharge of urban sewage has also increased, and the requirements for sewage treatment technology have become higher and higher. For pollutants, the removal of chemical oxygen demand (COD) is relatively simple, and most research focuses on the removal of ammonia nitrogen. Biological denitrification technology is currently the most widely used sewage denitrification technology, that is, nitrogen removal is achieved through nitrifying bacteria and denitrifying bacteria, and sufficient carbon source is the key to efficient denitrification by denitrifying bacteria. Some researchers have proposed that when the influent C / N ratio is lower than 3.4, an external carbon source needs to be added to ensure the biological denitrification effect. This result has also been widely recognized and widely used.

[0003] At present, since most cities in my country use a combined drainage system for domestic sewage and rainwater, the C / N ratio of water entering the sewage treatment plant is often lower than 3.4. In order to achieve efficient nitrogen removal, it is usually necessary to add organic carbon sources such as methanol or ethanol, which not only consumes limited organic resources, but also increases the operating costs of the sewage treatment plant. Patent CN201910079980.1 discloses a water efficient nitrogen and phosphorus removal process (SSCS) and its application. Although it can use its own carbon source to make up for the denitrification carbon source, the method it adopts is to add a sludge activation tank to activate the sludge and then return it. The equipment cost is high and the process is complicated, which is not conducive to improving the efficiency of sewage treatment. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a sludge optimization device and a denitrification system having the same, which can improve and increase the microbial content of the return sludge without adding an external carbon source, make full use of the existing carbon source, and improve the denitrification effect of low C / N sewage.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A sludge optimization device is provided, comprising a tank body and a sludge discharge hopper connected to the bottom of the tank body, wherein a sludge inlet pipe is connected to the side of the tank body, and a sludge outlet pipe is connected to the upper part of the tank body; a centrifugal assembly for separating non-microbial impurities is provided in the tank body, the sludge inlet pipe is located above the centrifugal assembly, and the non-microbial impurities sink to the sludge discharge hopper, and a sludge discharge assembly is provided at the bottom of the sludge discharge hopper.

[0007] In the sludge optimization device of the present invention, sludge enters the tank body through the sludge inlet pipe and falls to the centrifugal assembly. Under the centrifugal action of the centrifugal assembly, the heavier non-microbial impurities in the sludge are separated and sink into the sludge discharge bucket, so that the sludge with a higher microbial content is discharged from the upper sludge discharge pipe. The present invention can reduce the content of non-microbial impurities in the return sludge and improve the sludge activity.

[0008] Furthermore, the centrifugal assembly includes a fixed bracket and a guide plate coaxially arranged with the tank body, the fixed bracket is connected between the guide plate and the tank body, and the sludge flow direction of the sludge inlet pipe is tangent to the surface of the guide plate.

[0009] Furthermore, the guide plate is a frustum structure which is narrow at the top and wide at the bottom, and the sludge flow direction of the sludge inlet pipe is tangent to the side surface of the frustum structure.

[0010] Furthermore, the guide discs are in multiple groups, and the multiple groups of guide discs are coaxially arranged at equal intervals.

[0011] Furthermore, there are two groups of fixed brackets, and the two groups of fixed brackets are symmetrically arranged on both sides of the axis of the guide plate.

[0012] Furthermore, the fixing bracket is an L-shaped structure, one end of the L-shaped structure is connected to the guide plate, and the other end of the L-shaped structure is connected to the bottom of the pool body.

[0013] Furthermore, the mud discharge assembly includes a mud discharge pipe and a mud discharge valve, the mud discharge pipe is connected to the bottom of the mud discharge bucket, and the mud discharge valve is arranged on the mud discharge pipe.

[0014] Furthermore, the mud discharge bucket is a conical structure with a cross-sectional diameter gradually decreasing from top to bottom.

[0015] The present invention also provides a denitrification system, including a biochemical tank, a secondary sedimentation tank, a sludge pump and the sludge optimization device as described above, wherein the biochemical tank is connected to the secondary sedimentation tank, a sludge pump is connected between the secondary sedimentation tank and the sludge inlet pipe, and the sludge outlet pipe is connected to the biochemical tank.

[0016] In the denitrification system of the present invention, the sludge produced in the secondary sedimentation tank is treated by the sludge optimization device, and the heavier non-microbial impurities in the sludge are separated and sink into the sludge discharge hopper, and the sludge with a higher microbial content is discharged from the upper sludge discharge pipe to the biochemical tank for denitrification treatment. Since the content of non-microbial impurities in the return sludge is reduced and the sludge activity is improved, the treatment capacity of the biochemical tank is improved, which can effectively improve the denitrification effect of low C / N ratio sewage.

[0017] Furthermore, the secondary sedimentation tank is connected to a sludge discharge pipeline, and the sludge discharge assembly is connected to the sludge discharge pipeline.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The sludge optimization device of the present invention utilizes the centrifugal action of the centrifugal assembly to separate the heavier non-microbial impurities in the sludge, thereby reducing the content of the non-microbial impurities in the sludge and improving the activity of the sludge.

[0020] The denitrification system of the present invention reduces the non-microbial impurity content of the return sludge returned to the biochemical pool, improves the sludge activity, improves the treatment capacity of the biochemical pool, and effectively improves the denitrification effect of low C / N ratio sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram I of the sludge optimization device in Example 1;

[0022] Figure 2 It is a top view of the sludge optimization device in Example 1;

[0023] Figure 3 It is a structural schematic diagram II of the sludge optimization device in Example 1;

[0024] Figure 4 It is the structural schematic diagram III of the sludge optimization device in Example 1;

[0025] Figure 5 It is a structural schematic diagram IV of a sludge optimization device of an embodiment;

[0026] Figure 6 It is a schematic diagram of the denitrification system in Example 2;

[0027] In the attached drawings: 10-sludge optimization device; 1-tank body; 2-sludge discharge bucket; 3-sludge inlet pipe; 31-connecting part; 32-sludge inlet part; 4-sludge outlet pipe; 5-centrifugal assembly; 51-fixed bracket; 52-guide plate; 53-first rod; 54-second rod; 6-sludge discharge assembly; 61-sludge discharge pipe; 62-sludge discharge valve; 20-biochemical tank; 30-second sedimentation tank; 40-sludge pump. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] like Figures 1 to 5 The embodiment of the sludge optimization device 10 of the present invention is shown, which includes a tank body 1 and a sludge discharge bucket 2 connected to the bottom of the tank body 1, a sludge inlet pipe 3 connected to the side of the tank body 1, and a sludge outlet pipe 4 connected to the top of the tank body 1; a centrifugal assembly 5 for separating non-microbial impurities is provided in the tank body 1, the sludge inlet pipe 3 is located above the centrifugal assembly 5, and the non-microbial impurities sink to the sludge discharge bucket 2, and a sludge discharge assembly 6 is provided at the bottom of the sludge discharge bucket 2. The tank body 1 of this embodiment can preferably be a columnar structure, but it is not a limiting provision of the present invention.

[0032] When this embodiment is implemented, the sludge enters the tank body 1 from the sludge inlet pipe 3 and falls to the centrifugal assembly 5. Under the centrifugal action of the centrifugal assembly 5, the heavier non-microorganism impurities in the sludge are separated and sink into the sludge discharge bucket 2, and the sludge with a higher microbial content is discharged from the sludge discharge pipe 4 at the upper part of the tank body 1. This embodiment uses physical separation, does not need to increase pressure, and has a simple structure; compared with traditional sedimentation separation, this embodiment can save tank volume and sedimentation time.

[0033] The sludge entering from the sludge inlet pipe 3 falls into the centrifugal assembly 5, and the centrifugal assembly 5 produces a centrifugal effect on the sludge. The ways of producing the centrifugal effect in this embodiment include but are not limited to the following two: the centrifugal assembly 5 rotates, the sludge falls to the centrifugal assembly 5, and the non-microbial impurities with heavier mass are separated under the action of centrifugal force; the centrifugal assembly 5 is fixed, and the sludge inlet direction of the sludge inlet pipe 3 and the structure of the centrifugal assembly 5 are set, so that the centrifugal force is generated when the sludge falls to the centrifugal assembly 5, and the non-microbial impurities with heavier mass are separated under the action of centrifugal force.

[0034] In order to simplify the structure of the pool body 1, this embodiment adopts a method of fixing the centrifugal assembly 5, specifically:

[0035] The centrifugal assembly 5 includes a fixed bracket 51 and a guide plate 52 coaxially arranged with the tank body 1. The fixed bracket 51 is connected between the guide plate 52 and the tank body 1. The sludge flow direction of the sludge inlet pipe 3 is tangent to the surface of the guide plate 52. Figure 2As shown, the guide plate 52 is provided with a smooth arc-shaped side surface. When the sludge enters from the sludge inlet pipe 3, the sludge inflow direction is tangent to the arc-shaped side surface of the guide plate 52, and a circular flow state is formed on the arc-shaped side surface, thereby generating a centrifugal force, so that the heavier non-microorganism impurities in the sludge are separated and sink into the conical sludge discharge bucket 2, so that the microbial content in the sludge can be easily increased and the sludge activity can be improved.

[0036] The guide plate 52 is a truncated cone structure that is narrow at the top and wide at the bottom. The sludge flow direction of the sludge inlet pipe 3 is tangent to the side of the truncated cone structure; the sludge inlet pipe 3 includes a connecting portion 31 and a sludge inlet portion 32 that are connected to each other, and an obtuse angle is provided between the connecting portion 31 and the sludge inlet portion 32 to ensure that the sludge flow can form a circular flow centrifugal separation on the side of the truncated cone structure to prevent the sludge flow from flowing to the inner wall of the tank body 1 and affecting the centrifugal effect; the sludge outlet pipe 4 is arranged at the upper part of the tank body 1 and above the guide plate 52. Under the action of centrifugal force, non-microbial impurities with larger mass sink, and the sludge flows out from the upper part of the tank body 1, which can effectively ensure that the microbial content and activity of the discharged sludge are high.

[0037] In order to improve the separation effect, the guide plates 52 of this embodiment are multiple groups, and the multiple groups of guide plates 52 are coaxially arranged at equal intervals. The multiple groups of guide plates 52 play a separation role at the same time, which can improve the separation effect and separation efficiency. The multiple groups of guide plates 52 are evenly spaced and distributed for the purpose of obtaining an aesthetic effect, and are not intended to be a limiting provision of the present invention. Specifically, in this embodiment, multiple groups of mud inlet pipes 3 can be arranged on the side of the pool body 1, and the number of mud inlet pipes 3 is equal to the number of guide plates 52, and the mud inlet pipes 3 correspond to the guide plates 52 one by one, such as Figure 3 As shown; in this embodiment, multiple groups of mud inlet portions 32 can be connected to the same connecting portion 31, and multiple groups of mud inlet portions 32 correspond to the guide plate 52 one by one, such as Figure 4 As shown; with such an arrangement, each sludge inlet can be tangent to the side of the guide plate 52, and a circulation can be formed on the side of the guide plate 52, thereby playing a centrifugal and sedimentation role. Multiple groups of guide plates 52 play a centrifugal role and inclined plate sedimentation role at the same time, effectively improving the separation effect and centrifugal efficiency of the centrifugal assembly 5.

[0038] However, it should be noted that the tangent of the sludge inflow direction to the arc-shaped side of the guide plate 52 is a preferred method for obtaining a better separation effect and centrifugal efficiency, but it is not a limiting provision of the present invention. When the sludge inflow direction is not tangent to the guide plate 52, the sludge can also be separated under the sedimentation effect of the inclined plate of the guide plate 52. In this case, the sludge inlet 32 ​​of this embodiment can be set as a bell-mouth structure, such as Figure 5 As shown, the sludge entering from the bell mouth can fall onto the upper and lower multi-layer guide plates 52, and the sludge is separated under the sedimentation effect of the inclined plates of the guide plates 52 and the centrifugal effect.

[0039] There are two groups of fixed brackets 51, and the two groups of fixed brackets 51 are symmetrically arranged on both sides of the axis of the guide plate 52. Figure 1 , Figure 3 As shown. Among them, the fixed bracket 51 is an L-shaped structure, one end of the L-shaped structure is connected to the guide plate 52, and the other end of the L structure is connected to the bottom of the pool body 1. In order to avoid the influence of the fixed bracket 51 structure on the centrifugal effect, the fixed bracket 51 of this embodiment is set to a rod-shaped structure. Specifically, the L-shaped structure includes a first rod 53 and a second rod 54 connected at the end, the first rod 53 is connected to the guide plate 52, and the second rod 54 is connected to the bottom of the pool body 1. When the guide plates 52 are multiple groups, the multiple groups of guide plates 52 are connected in series on the first rod 53 at equal intervals. In addition, in order to ensure the fixing effect of the guide plate 52, the two groups of second rods 54 in this embodiment are located on the same diameter of the cross section of the pool body 1. It should be noted that the structure, quantity and position of the fixed bracket 51 are preferably made in order to obtain an aesthetically pleasing appearance and good fixing stability, and are not intended to be a restrictive provision of the present invention.

[0040] The mud discharge assembly 6 includes a mud discharge pipe 61 and a mud discharge valve 62. The mud discharge pipe 61 is connected to the bottom of the mud discharge bucket 2, and the mud discharge valve 62 is arranged on the mud discharge pipe 61. The mud discharge bucket 2 is used to collect non-microbial structures with large mass: to facilitate the collection of sediment (non-microbial structures with large mass), the mud discharge bucket 2 of this embodiment is set as a conical structure with a gradually decreasing cross-sectional diameter from top to bottom; to facilitate the control of the mud discharge process, the mud discharge pipe 61 and the mud discharge valve 62 are arranged at the bottom of the mud discharge bucket 2 in this embodiment. When the mud discharge valve 62 is opened, the sediment can be discharged, and when the mud discharge valve 62 is closed, it is conducive to the collection of the sediment.

[0041] Embodiment 2

[0042] like Figure 6 The figure shows an embodiment of the denitrification system of the present invention, including a biochemical tank 20, a secondary sedimentation tank 30, a sludge pump 40 and a sludge optimization device 10 as in the first embodiment. The biochemical tank 20 is connected to the secondary sedimentation tank 30, a sludge pump 40 is connected between the secondary sedimentation tank 30 and the sludge inlet pipe 3, and the sludge outlet pipe 4 is connected to the biochemical tank 20.

[0043] During the implementation of this embodiment, the sludge produced in the secondary sedimentation tank 30 is treated by the sludge optimization device 10, and the heavier non-microbial impurities in the sludge are separated and sink into the sludge discharge hopper 2, and the sludge with a higher microbial content is discharged from the upper sludge discharge pipe 4 to the biochemical tank 20 for denitrification treatment. Since the content of non-microbial impurities in the return sludge is reduced and the sludge activity is improved, the processing capacity of the biochemical tank 20 is improved, which can effectively improve the denitrification effect of low C / N ratio sewage.

[0044] During the operation of the denitrification system, the C / N ratio of the water in the biochemical pool 20 is relatively low. After the sludge produced in the secondary sedimentation tank 30 is treated by the sludge optimization device 10, the heavier non-microbial impurities in the sludge are separated and sink into the sludge discharge hopper 2. The sludge with a higher microbial content is discharged from the upper sludge discharge pipe 4 to the biochemical pool 20 for denitrification treatment. In this embodiment, the impurities in the sludge discharge hopper 2 are detected, and most of them are inorganic substances, with only a small amount of organic matter and microorganisms. It can be inferred that the non-microbial impurities in the sludge discharged from the sludge discharge pipe 4 are low in content and high in activity. After running for several months, the ammonia nitrogen content of the effluent from the secondary sedimentation tank 30 is detected. The ammonia nitrogen content is significantly lower than that without the sludge optimization device 10 installed. It can be seen that the denitrification system of this embodiment has a better denitrification effect due to the addition of the sludge optimization device 10, without the need for an external carbon source, which can save carbon sources.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A sludge optimization device, characterized in that: The invention comprises a tank body (1) and a mud discharge bucket (2) connected to the bottom of the tank body (1), the side of the tank body (1) is connected to a mud inlet pipe (3), and the upper part of the tank body (1) is connected to a mud outlet pipe (4); a centrifugal assembly (5) for separating non-microbial impurities is provided in the tank body (1), the mud inlet pipe (3) is located above the centrifugal assembly (5), and the non-microbial impurities sink to the mud discharge bucket (2), and a mud discharge assembly (6) is provided at the bottom of the mud discharge bucket (2); the centrifugal assembly (5) comprises a fixed bracket (51) and a guide plate (52) coaxially arranged with the tank body (1), the fixed bracket (51) is provided with a guide plate (52) coaxially arranged with the tank body (1), and the fixed bracket (51) is provided with a guide plate (52) coaxially arranged with the tank body (1). The frame (51) is connected between the guide plate (52) and the tank body (1); the direction of the sludge flow of the sludge inlet pipe (3) is tangent to the surface of the guide plate (52); the guide plate (52) is a truncated cone structure that is narrow at the top and wide at the bottom; the direction of the sludge flow of the sludge inlet pipe (3) is tangent to the side surface of the truncated cone structure; the guide plates (52) are multiple groups, and the multiple groups of guide plates (52) are coaxially arranged at equal intervals; the sludge discharge assembly (6) comprises a sludge discharge pipe (61) and a sludge discharge valve (62); the sludge discharge pipe (61) is connected to the bottom of the sludge discharge bucket (2); and the sludge discharge valve (62) is arranged on the sludge discharge pipe (61).

2. The sludge optimization device according to claim 1, characterized in that: The fixed brackets (51) are in two groups, and the two groups of fixed brackets (51) are symmetrically arranged on both sides of the axis of the guide plate (52).

3. The sludge optimization device according to claim 2, characterized in that: The fixed bracket (51) is an L-shaped structure, one end of the L-shaped structure is connected to the guide plate (52), and the other end of the L-shaped structure is connected to the bottom of the pool body (1).

4. The sludge optimization device according to claim 1, characterized in that: The mud discharge bucket (2) is a conical structure with a cross-sectional diameter that gradually decreases from top to bottom.

5. A denitrification device, characterized in that: The invention comprises a biochemical tank (20), a secondary sedimentation tank (30), a sludge pump (40), and a sludge optimization device (10) according to any one of claims 1 to 4, wherein the biochemical tank (20) is connected to the secondary sedimentation tank (30), a sludge pump (40) is connected between the secondary sedimentation tank (30) and a sludge inlet pipe (3), and the sludge outlet pipe (4) is connected to the biochemical tank (20).

6. The denitrification device according to claim 5, characterized in that: The secondary sedimentation tank (30) is connected to a sludge discharge pipeline, and the sludge discharge assembly (6) is connected to the sludge discharge pipeline.

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