Sewage treatment equipment

Abstract

The utility model provides sewage treatment equipment. According to the embodiment of the utility model, the sewage treatment tank is divided into the first treatment area and the second treatment area by using the middle partition plate, the concave part is arranged in the middle of the bottom plate in the second treatment area, and the second treatment area is further divided into the three sub-areas through the concave part; two air outlets of the fan assembly are respectively formed in the two sub-regions on the two sides of the sunken part, so that sewage conveyed from the first treatment region to the second treatment region through the middle partition plate can be respectively and sequentially subjected to first aeration treatment, stirring treatment and second aeration treatment in the three sub-regions; the situation that aeration treatment is executed in the whole second treatment area, so that organic matter is exhausted is avoided, the stirring treatment performed in the second treatment area has enough organic carbon sources, and the denitrification effect is improved.

Description

Technical Field

[0001] This application relates to the field of water treatment technologies, and particularly to a sewage treatment device. Background Art

[0002] With the rapid development of China's economy, great changes have taken place in various fields of society, and the sewage treatment industry has also undergone significant evolution along with social development. At the same time, the sewage treatment discharge standards are also constantly improving. For a long time, the goal of urban sewage treatment has been to remove organic matter and SS, without considering the removal of inorganic nitrogen and phosphorus. With the requirements of preventing water eutrophication and reusing reclaimed water, effectively reducing the nitrogen and phosphorus indicators has become an important factor in the selection of sewage treatment processes. Various denitrification and dephosphorization technologies such as physical methods, chemical methods, and biochemical methods have emerged; among them, the CASS process is a typical treatment method mainly based on the biochemical method (activated sludge method), which has the characteristics of flexible operation mode and low treatment cost.

[0003] The CASS (Cyclic Activated Sludge System) process is the abbreviation of the continuous influent periodic cyclic activated sludge method, which is an updated variant of the SBR process. It divides the pool structure into a pre-reaction zone and a main reaction zone through a partition wall with openings at the bottom, so that the dissolved oxygen, sludge concentration, and organic load are different in each zone, and the dominant biological strains in each pool are also different. During operation, it operates cyclically through the stages of influent - aeration - sedimentation - decantation - idling. However, the denitrification efficiency of this process is limited and cannot meet the increasingly strict denitrification indicators of environmental protection discharge standards.

[0004] Therefore, a domestic sewage treatment solution with better denitrification efficiency is needed. Summary of the Utility Model

[0005] The embodiments of the present utility model provide a sewage treatment device, which eliminates the defect of low denitrification efficiency in the installation of existing sewage treatment devices.

[0006] The embodiments of the present utility model provide a sewage treatment device, including:

[0007] A bottom plate;

[0008] Four side walls, which respectively extend vertically upward from the four side edges of the bottom plate;

[0009] Intermediate partition, the intermediate partition is at a first distance from one end side wall in the length direction of the bottom plate and extends upward parallel to this side wall. A first treatment area is formed between the one end side wall and the intermediate partition, and a second treatment area is formed between the intermediate partition and the other end side wall opposite to the one end side wall in the length direction of the bottom plate. Wherein, a water inlet is provided on the one end side wall, and a water outlet is provided on the other end side wall. Wherein, the second treatment area has a recessed part on the bottom plate, and the recessed part is arranged at the middle position of the part of the bottom plate in the second treatment area;

[0010] First stirrer, the first stirrer is arranged in the first treatment area;

[0011] Second stirrer, the second stirrer is arranged in the second treatment area and at the lower position of the intermediate partition;

[0012] Fan assembly, the air outlet of the fan assembly is connected with a blowing pipeline, and the blowing pipeline has a first air outlet and a second air outlet arranged in the second treatment area. The first air outlet is arranged in the second treatment area and between the intermediate partition and the recessed part, and the second air outlet is arranged in the second treatment area and between the other end side wall and the recessed part.

[0013] The sewage treatment equipment provided by the embodiment of the present invention divides the sewage treatment pool into a first treatment area and a second treatment area by using an intermediate partition, and a recessed part is arranged in the middle part of the bottom plate in the second treatment area, and the second treatment area is further divided into three sub-areas by the recessed part. Two air outlets of the fan assembly are respectively arranged in the two sub-areas on both sides of the recessed part, so that the sewage transported from the first treatment area to the second treatment area through the intermediate partition can sequentially perform the first aeration treatment, stirring treatment and second aeration treatment in the three sub-areas, avoiding the exhaustion of organic matter due to the implementation of aeration treatment in the entire area of the second treatment, enabling the stirring treatment carried out in the second treatment area to have sufficient organic carbon sources, and improving the denitrification effect.

[0014] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are hereinafter specifically exemplified. Brief Description of the Drawings

[0015] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0016] Figure 1 Schematically shown is a schematic diagram of the overall structure of a sewage treatment device according to an embodiment of the present application. Specific embodiments

[0017] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0018] With the rapid development of China's economy, great changes have taken place in various fields of society, and the sewage treatment industry has also undergone significant evolution along with social development. At the same time, the sewage treatment discharge standards are also constantly improving. For a long time, the goal of urban sewage treatment has been to remove organic matter and SS, without considering the removal of inorganic nitrogen and phosphorus. With the requirements of preventing water eutrophication and reusing reclaimed water, effectively reducing the nitrogen and phosphorus indexes has become an important factor in the selection of sewage treatment processes. Various denitrification and dephosphorization technologies such as physical methods, chemical methods, and biochemical methods have emerged; among them, the CASS process is a typical treatment method mainly based on biochemical methods (activated sludge method), which has the characteristics of flexible operation mode and low treatment cost.

[0019] The CASS (Cyclic Activated Sludge System) process is short for continuous influent periodic circulation activated sludge method, and it is an updated variant of the SBR process. It divides the pool structure into a pre-reaction zone and a main reaction zone through a partition wall with openings at the bottom, so that the dissolved oxygen, sludge concentration, and organic load are different in each zone, and the dominant biological strains in each pool are also different. During operation, it operates cyclically through the stages of influent - aeration - sedimentation - decantation - idling. However, the denitrification efficiency of this process is limited and cannot meet the increasingly strict denitrification indexes of environmental protection discharge standards.

[0020] For this reason, as shown in Figure 1 shown, Figure 1 is a schematic diagram showing the structure of a sewage treatment device according to an embodiment of the present application. In Figure 1 shown, the sewage treatment device may include; a bottom plate 1, four side walls, an intermediate partition 3, a first stirrer 41, a second stirrer 42, and a blower assembly 5.

[0021] For example, in the embodiment of the present application, the four side walls can respectively extend upward perpendicular to the four side edges of the bottom plate 1 to a predetermined height, so as to form a pool body with an upward opening together with the bottom plate 1. In the middle part of the bottom plate 1, for example, at a position on the bottom plate 1 that is at a first distance from the first side wall 21 at one end thereof, an intermediate partition 3 can be provided. The intermediate partition 3 can extend upward perpendicular to the bottom plate 1 to a predetermined height, so as to divide the internal space of the pool body into a first treatment area 11 and a second treatment area 12. For example, the first side wall 21 located at one end of the bottom plate can form the first treatment area 11 between it and the intermediate partition 3, and the second side wall 22 at the other end opposite to this end can form the second treatment area 12 between it and the intermediate partition 3. In this embodiment, a water inlet can be provided on the first side wall 21 to facilitate the input of the sewage to be treated into the first treatment area 11, and a water outlet can be provided on the second side wall 22 to facilitate the discharge of the treated sewage or clean water to the outside of the sewage treatment device.

[0022] In the embodiment of the present application, the sewage to be treated can be input into the first treatment area 11 through the opening on the first side wall 21. There can be various microbial populations in the first treatment area 11. These microbial populations can be various microbial populations used for treating sewage. For example, they can include aerobic heterotrophic bacteria, nitrifying bacteria, polyphosphate-accumulating bacteria, and denitrifying bacteria, etc. Of course, they can also include other microbial populations that reproduce or are generated during the sewage treatment process, such as filamentous bacteria. In addition, in the embodiment of the present application, there can be a certain amount of sludge in the first treatment area 11. These sludges can be pre-put in, or can be returned to the first treatment area 11 through the sludge return pump 101 during the previous sewage treatment process, or can also be deposited in the first treatment area 11 during the sewage treatment process.

[0023] The first stirrer 41 can be arranged in the first treatment area 11, and can be arranged, for example, at the lower part of the first side wall 21, preferably at its bottom. The second stirrer 42 can be arranged in the second treatment area 12, and can be arranged at the lower position of the intermediate partition 3.

[0024] Therefore, the stirring process can be carried out in the first treatment area 11 by the first stirrer 41 to bring the liquid sewage and the solid sludge into contact and then mix them together, so as to form an environment with a relatively high sludge concentration and / or a relatively high organic load in the first treatment area 11. Thus, various microbial populations in the first treatment area 11 can compete in such an environment to select the microbial populations suitable for sewage treatment requirements. For example, in the first treatment area, sludge with a concentration higher than a predetermined concentration threshold can be placed, and the first stirrer 41 is used to perform stirring to mix such high-concentration sludge with the sewage to be treated, so that the microbial populations in the first treatment area 11 can be in such a sewage-sludge mixed environment, thereby realizing the selection of microbial populations. In addition, in such a mixed environment containing high-concentration sludge, substances such as nitrogen or phosphorus rich in the high-concentration sludge can also be used to inhibit the growth of filamentous bacteria, thus avoiding problems such as sludge bulking or sludge floating caused by the excessive growth of filamentous bacteria, which affect the efficiency and effect of sewage treatment.

[0025] In addition, in the embodiment of the present application, during the process of the first stirrer 41 stirring the sewage to be treated and the sludge in the first treatment area 11, as the amount of the sewage to be treated input increases, for example, a water level detector or a water volume detector can be used to detect the amount of the first treated sewage generated in the first treatment area 11. When the amount of the first treated sewage reaches a predetermined sewage volume threshold, the first treated sewage in the first treatment area 11 can be transported to the second treatment area 12 through the intermediate partition 3, for example, through the water passing holes formed in the intermediate partition or the water passing channels formed by the intermediate partition.

[0026] In the embodiment of the present application, a recessed portion 123 can be formed in the middle portion of the bottom plate 1 in the second treatment area 12. The recessed portion can be formed by the middle portion of the bottom plate 1 located in the middle of the second treatment area 12 sinking downward, or can be formed by the portions of the bottom plate 1 located on both sides of the second treatment area 12 bulging upward to form the recessed portion 123. Corresponding to the formation of the recessed portion 123, the second treatment area 12 can be divided into three parts, namely, a first sub-treatment part 121 located between the intermediate partition 3 and the recessed portion 123, a second sub-treatment part 122 located between the recessed portion 123 and the side wall 22, and the part corresponding to the recessed portion 123.

[0027] The blower assembly 5 can be arranged outside the pool body or on top of the pool body. The air outlet of the blower assembly 5 can be connected with a blowing pipeline. This blowing pipeline can be used to transmit the airflow generated by the blower assembly 5 into the pool body. For example, in the embodiment of the present application, the blowing pipeline can have a first air outlet and a second air outlet arranged in the second treatment area 12 to respectively correspond to the first sub-treatment part 121 and the second sub-treatment part 122 of the second treatment area 12.

[0028] When the first treated sewage after being treated in the first treatment area enters the second treatment area 12, the blower assembly 5 can blow air through the first air outlet of the blowing pipeline in the first sub-treatment part 121 to perform aeration treatment on the incoming first treated sewage.

[0029] Specifically, by blowing gas through the blower assembly 5, sufficient oxygen is provided in the first sub-treatment part 121 to promote the growth and reproduction of aerobic microorganisms in the second treatment area, thereby effectively degrading the organic matter in the sewage and generating second treated sewage. Moreover, since a large amount of gas is blown in from the first air outlet through the blower assembly 5, an aerobic environment is created, so that in the second treatment area, especially in the first sub-treatment part 121, nitrifying bacteria can oxidize the ammonia nitrogen (NH4 + ) in the first treated sewage into nitrate (NO3 - ) to achieve the removal of nitrogen. In addition, polyphosphate-accumulating organisms in the second treatment area over-uptake phosphorus under the aerobic conditions provided by the first aeration treatment and store it in polyphosphate granules in the cells, thereby reducing the phosphorus content in the first treated sewage.

[0030] As the first treatment area 11 continuously conveys the first treated sewage to the second treatment area 12, the second treated sewage generated by the first aeration treatment in the first sub-treatment part 121 can be conveyed to the depression part 123. Since the two air outlets of the fan assembly 5 are respectively arranged at the first sub-treatment part 121 and the second sub-treatment part 122, there is less blown-in air flow at the depression part 123. In other words, the first aeration treatment using the air flow blown in through the first air outlet in the first sub-treatment part 121 becomes weak or even stops at the depression part 123. And at this time, the stirring treatment is actually carried out at the depression part 123, that is, the second stirrer 42 is used to stir the second treated sewage generated by the first sub-treatment part 121. In the embodiment of the present application, the second stirrer 42 can also be arranged at the adjacent position of the depression part 123 and the first sub-treatment part 121, or a third stirrer can be further arranged at the adjacent position, so as to perform the second stirring treatment on the second treated sewage generated in the first sub-treatment part 121 in the second treatment area at the depression part 123. Since the aeration treatment carried out in the first sub-treatment part 121 will eliminate the organic matter in the first treated sewage, therefore, by arranging the depression part 123 that does not perform aeration treatment between the two sub-treatment parts 121 and 122 where the aeration treatment is carried out, a certain amount of organic matter can still be retained in the sewage treated in the depression part 123, and thus the remaining organic matter in the sewage can be used as a carbon source to perform denitrification treatment by performing the second stirring treatment in this part, reducing the nitrate (NO3 - ) in the sewage to nitrogen gas (N2), thereby removing the nitrogen in the sewage. And because there is no air outlet to blow in air flow in the depression part, this part of the second treatment area is in an anoxic condition relative to the other two sub-treatment parts 121 and 122. Therefore, the remaining organic matter can be continuously degraded by facultative microorganisms and denitrifying bacteria, further reducing the organic pollution load in the sewage,

[0031] After that, the third treated sewage generated after the stirring treatment enters the second sub-treatment part 122 of the second treatment area. In this part, the fan assembly 5 can blow in gas through the second air outlet, so as to perform the second aeration treatment in the second sub-treatment part 122. Since the third treated sewage entering the second sub-treatment part 122 has removed the nitrogen in the sewage through the second stirring treatment in the depression part 123, sufficient oxygen can be provided by blowing in gas in the second sub-treatment part 122 to promote the growth and reproduction of aerobic microorganisms, further degrading the organic matter in the sewage to ensure that the organic matter concentration meets the standard. In addition, when sufficient oxygen is provided by blowing in gas, the activity of polyphosphate-accumulating bacteria in the second treatment area can also be promoted, enabling them to excessively absorb and store the phosphorus in the sewage, thereby reducing the phosphorus content in the water.

[0032]

[0032] In particular, in the embodiments of the present application, the blower assembly 5 may include a first blower 51 and a second blower 52. Correspondingly, the air blowing pipe may include a first sub-pipe 61 and a second sub-pipe 62. One end of the first sub-pipe 61 is connected to the air outlet of the first blower 51, and the other end of the first sub-pipe may be used as a first air outlet provided in the first sub-treatment section 121, while one end of the second sub-pipe 62 is connected to the air outlet of the second blower 52, and the other end of the second sub-pipe 62 may be used as a second air outlet provided in the second sub-treatment section 122. Therefore, the first blower 51 and the second blower 52 can be controlled separately to perform aeration treatment on different parts of the second treatment area respectively, thereby greatly improving the accuracy and efficiency of the aeration treatment in the second treatment area.

[0033] In the embodiments of the present application, the sewage treatment device may further include: a first aeration disc 91 and a second aeration disc 92. The first aeration disc 91 may be disposed at the bottom of the first sub-treatment section 121, for example, may be connected to the first air outlet, while the second aeration disc 92 may be disposed at the bottom of the second sub-treatment section 122 and may be connected to the second air outlet. Therefore, the air flow transmitted by the blower assembly 5 can be transmitted into the second treatment area through the first aeration disc 91 and the second aeration disc 92 having a larger area and more pores, thereby greatly improving the efficiency and effectiveness of aeration.

[0034]

[0033] In the embodiments of the present application, the sewage treatment device may further include a weir 8. The weir 8 may be disposed on one side of the second side wall 22 adjacent to the other end in the second treatment area 12, and may include a water inlet located in the second treatment area 12 and a water outlet located at the lower part of the second side wall 22 at the other end. For example, the weir 8 can discharge the sewage still mixed with sludge at the lower part of, for example, the second sub-treatment section 122 in the second treatment area 12 to the outside, so as to leave the sludge at the bottom of the second treatment area 12 and serve as the return sludge flowing back to the first treatment area 11, while the clear water located at the upper part can be discharged to the outside for secondary utilization. In particular, in the embodiments of the present application, after discharging the clear water, the remaining sewage can be discharged to the lowest water level through the weir 8 to retain the sludge at the bottom of the second treatment area 12.

[0035] In addition, in the embodiments of the present application, the sewage treatment device may further include a sludge pump, which may be disposed at the bottom on one side of the second side wall 22 adjacent to the other end in the second treatment area 12, so that when the amount of remaining sludge in the second treatment area 12 is excessive, the excess sludge can also be further discharged to the outside of the sewage treatment device through the sludge pump.

[0036] The sewage treatment equipment according to the embodiment of the present application may further include a sludge return pump 101. The sludge return pump 101 may be disposed at the bottom of the recessed portion 123 of the second treatment area 12, and the sludge return pump 101 may be connected to one end of a sludge return pipeline, and the other end of the sludge return pipeline may be disposed in the first treatment area 11. Thus, during the treatment process performed on different sub-parts of the second treatment area 12, a part of the sludge located in the recessed portion 123 of the second treatment area 12 may be returned to the first treatment area 11 through the sludge return pump 101 to supplement the first sludge, and a first stirring treatment may be performed in the first treatment area 11. Therefore, through sludge return, sufficient high-concentration sludge is ensured in the first treatment area to guarantee a high-concentration sludge environment in the first treatment area. In addition, the sludge return pump 101 may also return the sludge in the recessed portion 123 to the second sub-treatment portion 122 of the second treatment area 12 to ensure the quantity and activity of microorganisms in the first treatment area and the second treatment area. Moreover, through sludge return, a stirring treatment is simultaneously performed to ensure sufficient mixing of sewage and microorganisms, prevent sludge deposition, and guarantee efficient operation in the treatment area.

[0037] The sewage treatment equipment provided by the embodiment of the present utility model divides a sewage treatment tank into a first treatment area and a second treatment area by using an intermediate partition, and a recessed portion is provided in the middle part of the bottom plate in the second treatment area. The second treatment area is further divided into three sub-areas by the recessed portion. Two air outlets of a blower assembly are respectively disposed in the two sub-areas on both sides of the recessed portion, so that the sewage transported from the first treatment area to the second treatment area through the intermediate partition can sequentially undergo a first aeration treatment, a stirring treatment, and a second aeration treatment in the three sub-areas, avoiding depletion of organic matter due to performing aeration treatment in the entire area of the second treatment, enabling the stirring treatment performed in the second treatment area to have sufficient organic carbon sources, and improving the denitrification effect.

[0038] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A sewage treatment device, characterized in that, Comprising: Bottom plate; Four side walls, the four side walls extending vertically upward from the four side edges of the bottom plate respectively; Intermediate partition, the intermediate partition reaching a first distance from a first side wall at one end in the length direction of the bottom plate and extending upward parallel to this side wall, a first treatment area being formed between the side wall at one end and the intermediate partition, and a second treatment area being formed between the intermediate partition and a second side wall at the other end opposite to the side wall at one end in the length direction of the bottom plate, wherein, a water inlet is provided on the first side wall at one end, and a water outlet is provided on the second side wall at the other end, wherein, the second treatment area has a recessed part on the bottom plate, and the recessed part is arranged at the middle position of the part of the bottom plate in the second treatment area; First stirrer, the first stirrer being arranged in the first treatment area; Second stirrer, the second stirrer being arranged in the second treatment area and at the lower position of the intermediate partition; Fan assembly, an air outlet of the fan assembly being connected to a blowing pipeline, and the blowing pipeline having a first air outlet and a second air outlet arranged in the second treatment area, the first air outlet being arranged in the second treatment area and between the intermediate partition and the recessed part, and the second air outlet being arranged in the second treatment area and between the second side wall at the other end and the recessed part.

2. The sewage treatment equipment according to claim 1, characterized in that, The first stirrer is arranged at the bottom of the first side wall at one end.

3. The sewage treatment equipment according to claim 2, characterized in that, The fan assembly includes a first blower and a second blower, and the blowing pipeline includes a first sub-pipeline and a second sub-pipeline, one end of the first sub-pipeline being connected to the air outlet of the first blower, the other end of the first sub-pipeline being used as the first air outlet, one end of the second sub-pipeline being connected to the air outlet of the second blower, and the other end of the second sub-pipeline being used as the second air outlet.

4. The sewage treatment equipment according to claim 3, characterized in that, The sewage treatment equipment further includes a sludge return pump, the sludge return pump being arranged at the bottom of the recessed part, the sludge return pump being connected to one end of a sludge return pipeline, and the other end of the sludge return pipeline being arranged in the first treatment area.

5. The sewage treatment equipment according to claim 4, wherein The sewage treatment equipment further includes: a first aeration disc and a second aeration disc, the first aeration disc being arranged at the first air outlet, and the second aeration disc being arranged at the second air outlet.

6. The sewage treatment equipment according to claim 5, characterized in that The sewage treatment equipment further includes a water decanter, the water decanter being arranged on one side close to the second side wall at the other end in the second treatment area, and including a water inlet in the second treatment area and a drain outlet at the lower part of the second side wall at the other end.

7. The sewage treatment equipment according to claim 6, characterized in that, The sewage treatment equipment further includes: a sludge pump, the sludge pump being arranged at the bottom on one side close to the second side wall at the other end in the second treatment area.

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