CN112142280A - A sludge optimization device and a denitrification system having the same - Google Patents

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sludge optimization device and a denitrification system with the same, wherein the sludge optimization device comprises a tank body and a sludge discharge hopper connected to the bottom of the tank body, a sludge inlet pipe is connected to the side part of the tank body, and a sludge outlet pipe is connected to the upper part of the tank body; the pond body is internally provided with a centrifugal assembly for separating out non-microbial impurities, the sludge inlet pipe is positioned above the centrifugal assembly, the non-microbial impurities sink to the sludge discharge hopper, and the bottom of the sludge discharge hopper is provided with a sludge discharge assembly. According to the sludge optimization device, the non-microbial impurities with heavier mass in the sludge are separated by utilizing the centrifugal action of the centrifugal component, so that the content of the non-microbial impurities in the sludge is reduced, and the sludge activity is improved; the denitrification system of the invention reduces the content of non-microbial impurities in the returned sludge returned to the biochemical tank, improves the sludge activity, improves the treatment capacity of the biochemical tank, and effectively improves the denitrification effect of the sewage with low C/N ratio.

Description

A sludge optimization device and a denitrification system having the same

technical field

The present invention relates to the technical field of sewage treatment, and more particularly, to a sludge optimization device and a denitrification system having the same.

Background technique

With the rapid growth of the social economy and the improvement of the average living standard of residents, urbanization has been rapidly promoted, and the discharge of urban sewage is also increasing, and the requirements for sewage treatment technology are getting higher and higher. For pollutants, the removal of chemical oxygen demand (COD) is relatively simple, and most studies focus on the removal of ammonia nitrogen. Biological denitrification technology is currently the most widely used wastewater denitrification technology, that is, nitrogen removal is achieved by 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 should be added to ensure the biological denitrification effect. This result has also been widely recognized and widely used.

At present, because most urban domestic sewage and rainwater in my country adopt the drainage system of combined rain and sewage, the C/N ratio of the water entering the sewage treatment plant is often lower than 3.4. In order to achieve efficient nitrogen removal, it is usually adopted to add organic carbon such as methanol or ethanol. This will not only consume limited organic resources, but also increase the operating cost of the sewage plant. Patent CN201910079980.1 discloses a high-efficiency water denitrification and phosphorus removal process (SSCS) and its application. Although it can use its own carbon source to make up for the denitrifying carbon source, the method adopted is to add a sludge activation tank to activate the sludge. Backflow after treatment has high equipment cost and cumbersome process, which is not conducive to improving the efficiency of sewage treatment.

SUMMARY OF THE INVENTION

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

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A sludge optimization device is provided, comprising a pool body and a sludge discharge bucket connected to the bottom of the pool body, a mud inlet pipe is connected to the side of the pool body, and a mud outlet pipe is connected to the upper part of the pool body; There is a centrifugal assembly for separating out non-microbial impurities, the mud inlet pipe is located above the centrifugal assembly, and the non-microbial impurities sink to a mud discharge bucket, and a mud discharge assembly is provided at the bottom of the mud discharge bucket.

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

Further, the centrifugal assembly includes a fixed bracket and a guide plate arranged coaxially with the pool body, the fixed bracket is connected between the guide plate and the pool body, and the sludge flow direction of the mud inlet pipe is related to the guide plate. The surfaces are tangent.

Further, the guide plate is a circular truncated structure with a narrow upper and a lower width, and the sludge flow direction of the mud inlet pipe is tangent to the side surface of the circular truncated structure.

Further, there are multiple groups of the guide discs, and the multiple sets of guide discs are arranged coaxially at equal intervals.

Further, there are two sets of the fixing brackets, and the two sets of fixing brackets are symmetrically arranged on both sides of the axis of the guide plate.

Further, 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.

Further, the mud discharge assembly includes a mud discharge pipeline and a mud discharge valve, the mud discharge pipeline is connected to the bottom of the mud discharge bucket, and the mud discharge valve is arranged in the mud discharge pipeline.

Further, the sludge discharge bucket is a conical structure with a cross-sectional diameter gradually decreasing from top to bottom.

The present invention also provides a denitrification system, comprising a biochemical tank, a secondary sedimentation tank, a sludge pump and the sludge optimization device as described above, wherein the biochemical tank is communicated with the secondary sedimentation tank, and the secondary sedimentation tank is connected to the inlet A sludge pump is connected between the mud pipes, and the mud outlet pipe is connected with the biochemical tank.

In the denitrification system of the present invention, after the sludge generated in the secondary sedimentation tank is processed by the sludge optimization device, the non-microbial impurities with heavier quality in the sludge are separated out and sink into the sludge discharge bucket, and the sludge with higher microbial content is separated. The sludge is discharged from the upper sludge discharge pipe to the biochemical tank for denitrification treatment. Due to the reduction of non-microbial impurities in the return sludge and the improvement of sludge activity, the processing capacity of the biochemical tank is improved, which can effectively improve the denitrification of low C/N ratio sewage. Nitrogen effect.

Further, the secondary sedimentation tank is connected with a sludge discharge pipeline, and the sludge discharge component is connected with the sludge discharge pipeline.

Compared with the prior art, the beneficial effects of the present invention are:

The sludge optimization device of the present invention uses the centrifugal action of the centrifugal component to separate out the non-microbial impurities with heavy quality in the sludge, reduces the content of the non-microbial impurities in the sludge, and improves the activity of the sludge;

In the denitrification system of the invention, the non-microbial impurity content of the reflux sludge returned to the biochemical tank is reduced, the sludge activity is improved, the processing capacity of the biochemical tank is improved, and the denitrification effect of low C/N ratio sewage is effectively improved.

Description of drawings

Fig. 1 is the structural representation 1 of sludge optimization device among the embodiment one;

2 is a top view of the sludge optimization device in the first embodiment;

3 is a schematic structural diagram II of the sludge optimization device in Example 1;

4 is a schematic structural diagram III of the sludge optimization device in Example 1;

FIG. 5 is a schematic structural diagram IV of a sludge optimization device according to the embodiment;

Fig. 6 is the schematic diagram of denitrification system in embodiment two;

In the attached drawings: 10-sludge optimization device; 1-pool body; 2-sludge bucket; 3-sludge inlet pipe; 31-connection 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-mud discharge assembly; 61-mud discharge pipe; 62-mud discharge valve; 20-biochemical tank; 30-second sink Pool; 40 - Sludge Pump.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. Among them, the accompanying drawings are only used for exemplary description, and they are only schematic diagrams, not physical drawings, and should not be construed as restrictions on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, The enlargement or reduction does not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms “upper”, “lower”, “left” and “right” The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, with a specific orientation. Orientation structure and operation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation on the present patent. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

Example 1

Figures 1 to 5 show an embodiment of the sludge optimization device 10 of the present invention, which includes a pool body 1 and a sludge discharge bucket 2 connected to the bottom of the pool body 1, and a mud inlet pipe 3 is connected to the side of the pool body 1. The upper part of the pool body 1 is connected with a mud outlet pipe 4; the pool body 1 is provided with a centrifugal assembly 5 for separating out non-microbial impurities, 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 the The bottom of the mud bucket 2 is provided with a mud discharge assembly 6 . The cell body 1 in this embodiment may preferably have a column structure, but it is not a limitation of the present invention.

In the implementation of this embodiment, the sludge enters the tank body 1 through the sludge inlet pipe 3 and falls to the centrifugal assembly 5. Under the centrifugal action of the centrifugal assembly 5, the non-microbial impurities with heavier mass in the sludge are separated and sink to the discharge In the mud hopper 2 , the sludge with high microbial content is discharged from the mud discharge pipe 4 at the upper part of the tank body 1 . This embodiment utilizes physical separation without increasing pressure, and has a simple structure; compared with traditional precipitation separation, this embodiment can save the volume of the pond and save the precipitation time.

The sludge entered by the sludge inlet pipe 3 falls into the centrifugal assembly 5, and the centrifugal assembly 5 produces a centrifugal effect on the sludge. The centrifugal effect in this embodiment includes but is not limited to the following two ways: the centrifugal assembly 5 rotates, and the sludge falls to Centrifugal assembly 5 separates heavy non-microbial impurities under the action of centrifugal force; centrifugal assembly 5 is fixed, and by setting the mud feeding direction of mud inlet pipe 3 and the structure of centrifugal assembly 5, when sludge falls to centrifugal assembly 5 Centrifugal force is generated, and under the action of centrifugal force, non-microbial impurities with heavier quality are separated.

In order to simplify the structure of the tank body 1, the centrifugal assembly 5 is fixed in this embodiment, specifically:

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

The guide plate 52 is a circular truncated structure with a narrow upper and a lower width, and the sludge flow direction of the mud inlet pipe 3 is tangent to the side surface of the circular truncated structure; There is an obtuse angle between it and the mud inlet 32 to ensure that the sludge flow can form a circular flow centrifugal separation on the side of the circular table structure, and 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 set in the tank The upper part of the body 1 is located above the guide plate 52. Under the action of centrifugal force, the non-microbial impurities with large mass sink and the sludge flows out from the upper part of the tank body 1, which can effectively ensure that the microbial content in the outflowing sludge is high and the activity is relatively high. high.

In order to improve the separation effect, the guide discs 52 in this embodiment are provided in multiple groups, and the multiple sets of guide discs 52 are arranged coaxially at equal intervals. Multiple sets of guide discs 52 play a separation role at the same time, which can improve the separation effect and separation efficiency. The distribution of multiple sets of guide discs 52 at equal intervals is a preference made to obtain a beautiful effect, and is not a limitation of the present invention. . Specifically, in this embodiment, multiple groups of mud feeding pipes 3 can be arranged on the side of the tank body 1, the number of mud feeding pipes 3 is equal to that of the diversion discs 52, and the mud feeding tubes 3 and the diversion discs 52 are in one-to-one correspondence, such as As shown in FIG. 3; in this embodiment, multiple groups of mud inlets 32 can also be connected to the same connection part 31, and multiple groups of mud inlets 32 are in one-to-one correspondence with the guide plate 52, as shown in FIG. 4; Each sludge feeding mud is tangent to the side of the guide plate 52, and can form a circulation on the side of the guide plate 52, so as to play the role of centrifugation and sedimentation. It can effectively improve the separation effect and centrifugal efficiency of the centrifugal assembly 5 .

However, it should be noted that the inflow direction of the sludge is tangent to the arcuate side surface of the baffle plate 52 is a preference for obtaining better separation effect and centrifugal efficiency, but is not a limitation of the present invention. When the inflow direction of the sludge is not tangent to the guide plate 52, the sludge can also be separated under the sedimentation action of the inclined plate of the guide plate 52. In this case, the mud inlet 32 of this embodiment can As shown in FIG. 5 , the sludge entering from the bell mouth can fall on the upper and lower multi-layer guide plates 52 , and the sludge is separated by the inclined plate sedimentation and centrifugal action of the guide plate 52 .

There are two sets of fixing brackets 51 , and the two sets of fixing brackets 51 are symmetrically arranged on both sides of the axis of the guide plate 52 , as shown in FIG. 1 and FIG. 3 . The fixing 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 . In order to avoid the influence of the structure of the fixing bracket 51 on the centrifugal effect, the fixing bracket 51 in this embodiment is set as a rod-shaped structure. Specifically, the L-shaped structure includes a first rod 53 and a second rod 54 which are connected at the ends, the first rod 53 is connected with the guide plate 52, and the second rod 54 is connected with the bottom of the pool body 1. When the guide plate 52 is When there are multiple groups, the multiple groups of guide discs 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 arrangement of the structure, quantity and position of the fixing brackets 51 is a preference for obtaining a beautiful appearance and good fixing stability, and is not a limitation of the present invention.

The sludge discharge assembly 6 includes a sludge discharge pipeline 61 and a sludge discharge valve 62 . The sludge discharge pipeline 61 is connected to the bottom of the sludge discharge bucket 2 , and the sludge discharge valve 62 is provided in the sludge discharge pipeline 61 . The sludge discharge bucket 2 is used to collect non-microbial structures with a large mass: in order to facilitate the collection of sediment (non-microbial structures with a large mass), the sludge discharge bucket 2 in this embodiment is set to gradually decrease in cross-sectional diameter from top to bottom. Small cone structure; in order to control the sludge discharge process, in this embodiment, a sludge discharge pipeline 61 and a sludge discharge valve 62 are arranged at the bottom of the sludge discharge bucket 2. When the sludge discharge valve 62 is opened, the sludge can be discharged, and the sludge discharge valve is closed. 62 o'clock, which is conducive to the collection of sediment.

Embodiment 2

Figure 6 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 the sludge optimization device 10 in the first embodiment, the biochemical tank 20 and the secondary sedimentation tank 30 is connected, a sludge pump 40 is connected between the secondary sedimentation tank 30 and the mud inlet pipe 3 , and the mud outlet pipe 4 is connected with the biochemical tank 20 .

In the implementation of this embodiment, after the sludge generated in the secondary sedimentation tank 30 is processed by the sludge optimization device 10, the non-microbial impurities with heavier quality in the sludge are separated out and sink into the sludge discharge bucket 2, and the microbial content is relatively high. The high sludge is discharged from the upper sludge discharge pipe 4 to the biochemical tank 20 for denitrification treatment. Due to the reduction of the non-microbial impurity content in the return sludge and the improvement of the sludge activity, the processing capacity of the biochemical tank 20 is improved, which can effectively improve the low C /N ratio of the denitrification effect of sewage.

During the operation of the denitrification system, the C/N ratio of the influent water in the biochemical tank 20 is relatively low. After the sludge generated in the secondary sedimentation tank 30 is processed by the sludge optimization device 10, the non-microbial impurities with heavy quality in the sludge are separated and discharged. After sinking into the sludge discharge bucket 2, the sludge with higher microbial content is discharged from the upper sludge discharge pipe 4 to the biochemical tank 20 for denitrification treatment. In this embodiment, the impurities in the sludge discharge hopper 2 are detected, most of which are inorganic substances, and only a small amount of organic substances and microorganisms are present. It can be inferred that the content of non-microbial impurities in the sludge flowing out from the sludge discharge pipe 4 is relatively low and the activity is relatively low. The ammonia nitrogen content in the effluent of the secondary sedimentation tank 30 is detected after several months of operation, and the ammonia nitrogen content is significantly lower than that without the sludge optimization device 10 installed. Good denitrification effect without external carbon source, which can save carbon source.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. a sludge optimization device, it is characterized in that, comprise pool body (1) and be connected to the mud hopper (2) at the bottom of pool body (1), described pool body (1) side is connected with mud feeding pipe (3), the upper part of the pool body (1) is connected with a mud outlet pipe (4); the pool body (1) is provided with a centrifugal assembly (5) for separating out non-microbial impurities, and the mud inlet pipe ( 3) Located above the centrifugal assembly (5), 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). 2 . The sludge optimization device according to claim 1 , wherein the centrifugal assembly ( 5 ) comprises a fixed bracket ( 51 ) and a guide plate ( 52 ) arranged coaxially with the tank body ( 1 ), so that the The fixing bracket (51) is connected between the guide plate (52) and the tank body (1), and the sludge flow direction of the mud inlet pipe (3) is tangent to the surface of the guide plate (52). 3. The sludge optimization device according to claim 2, characterized in that, the guide plate (52) is a circular truncated structure with a narrow upper and a lower width, and the sludge flow direction of the mud inlet pipe (3) is the same as the circular truncated structure. The sides of the structure are tangent. 4 . The sludge optimization device according to claim 3 , wherein the guide plates ( 52 ) are in multiple groups, and the multiple groups of guide plates ( 52 ) are arranged coaxially at equal intervals. 5 . 5. The sludge optimization device according to any one of claims 1 to 4, characterized in that there are two sets of said fixing brackets (51), and the two sets of fixing brackets (51) are symmetrically arranged on the guide plate (52) both sides of the axis. 6 . The sludge optimization device according to claim 5 , wherein the fixing 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 with the guide plate ( 52 ). 7 . Connect to the bottom of the tank body (1). 7. The sludge optimization device according to claim 1, wherein the sludge discharge assembly (6) comprises a sludge discharge pipeline (61) and a sludge discharge valve (62), and the sludge discharge pipeline (61) is connected to At the bottom of the mud discharge bucket (2), the mud discharge valve (62) is arranged in the mud discharge pipeline (61). 8 . The sludge optimization device according to claim 7 , wherein the sludge discharge bucket ( 2 ) is a conical structure whose cross-sectional diameter gradually decreases from top to bottom. 9 . 9. A denitrification system, characterized in that it comprises a biochemical tank (20), a secondary sedimentation tank (30), a sludge pump (40) and the sludge optimization device ( 10), the biochemical tank (20) is communicated with the secondary sedimentation tank (30), and a sludge pump (40) is connected between the secondary sedimentation tank (30) and the mud inlet pipe (3), and the mud outlet pipe (4) Connect with the biochemical tank (20). 10 . The denitrification system according to claim 9 , wherein the secondary sedimentation tank ( 30 ) is connected with a sludge discharge pipeline, and the sludge discharge assembly ( 6 ) is connected with the sludge discharge pipeline. 11 .

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