A sewage treatment device

Abstract

The present invention discloses a sewage treatment device, which includes a first tank body, a water inlet pipe, a second tank body, a water outlet pipe and a connecting pipe. The first tank body is provided with a first solid-liquid separation zone, a first treatment zone and an intermediate zone in isolation from bottom to top in sequence, and the output end of the water inlet pipe is connected to the solid-liquid separation zone; the second tank body is provided with an intermediate zone, a second treatment zone and a second solid-liquid separation zone in isolation from top to bottom in sequence, and the input end of the water outlet pipe is connected to the second solid-liquid separation zone; the connecting pipe is connected to the intermediate zone and the intermediate zone; after the pollutants in the sewage undergo a first round of filtration, hydrolysis, acidification, methanation and liquid-solid separation in the first treatment zone, they enter the second treatment zone for a second round of liquid-solid separation, filtration, hydrolysis, acidification and methanation, and finally purify the sewage, which can realize the function of non-powered sewage treatment and reduce operation and maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a sewage treatment device. Background Art

[0002] In the field of wastewater treatment, biological treatment methods primarily utilize the metabolic functions of microorganisms to decompose and oxidize dissolved or colloidal organic matter in wastewater into stable organic matter, thereby purifying the wastewater. Common biological treatment methods include activated sludge and biofilm processes. Both methods include aeration processes, which typically use air pumps or fans to supply oxygen. These appliances not only require electricity but also require constant maintenance, increasing the cost of wastewater treatment. Summary of the Invention

[0003] The purpose of the present invention is to provide a sewage treatment device to solve the problem that an air pump or a fan is needed for aeration in existing sewage treatment devices, which increases the cost of sewage treatment.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: A sewage treatment device comprising:

[0005] a first tank body, wherein the first tank body is sequentially and segmentally isolated from bottom to top with a first solid-liquid separation zone, a first treatment zone, and an intermediate zone, wherein the first treatment zone is filled with a first filler, hydrolytic bacteria, acid-producing bacteria, and methanogenic bacteria;

[0006] a water inlet pipe, wherein the output end of the water inlet pipe is connected to the solid-liquid separation zone;

[0007] A second tank body, wherein the interior of the second tank body is sequentially and segmentally isolated from top to bottom and comprises a second intermediate zone, a second treatment zone, and a second solid-liquid separation zone, wherein the second treatment zone is provided with a second filler, hydrolytic bacteria, acid-producing bacteria, and methanogens;

[0008] a water outlet pipe, the input end of which is connected to the second solid-liquid separation zone;

[0009] A connecting pipe is provided, wherein the connecting pipe connects the first middle zone and the second middle zone.

[0010] Furthermore, the input end of the water inlet pipe is higher than the first solid-liquid separation zone; the output end of the water inlet pipe opens downward and is located in the first solid-liquid separation zone, the input end of the water outlet pipe opens downward and is located in the second solid-liquid separation zone, and the output end of the water outlet pipe is higher than the second solid-liquid separation zone.

[0011] Furthermore, in the horizontal direction, the output end of the water inlet pipe is located in the middle of the first solid-liquid separation zone, and the input end of the water outlet pipe is located in the middle of the second solid-liquid separation zone.

[0012] Furthermore, a first pressure plate is provided in the first tank body, and the first pressure plate is located at the upper and lower ends of the first processing area. A second pressure plate is provided in the second tank body, and the second pressure plate is located at the upper and lower ends of the second processing area. The first pressure plate and the second pressure plate both have a number of through holes on their plate surfaces.

[0013] Furthermore, the first pressing plate is detachably connected to the first tank body, and the second pressing plate is detachably connected to the second tank body.

[0014] Furthermore, the diameter of the through hole ranges from 40 mm to 60 mm.

[0015] Furthermore, the volume filling ratio of the first filler to the first treatment area ranges from 20% to 60%, and the volume filling ratio of the first filler to the first treatment area ranges from 40% to 80%.

[0016] Furthermore, the distance between the input end of the connecting tube and the first processing area is in the range of 50 mm to 80 mm, and the distance between the output end of the connecting tube and the second processing area is in the range of 50 mm to 80 mm.

[0017] Furthermore, the first filler is a porous fiber filler, the second filler is a spherical filler connected by biological ropes, the concentration of hydrolytic bacteria in the first treatment area is greater than the concentration of hydrolytic bacteria in the second treatment area, and the concentration of methanogens in the second treatment area is greater than the concentration of methanogens in the first treatment area.

[0018] Furthermore, the ratio of sewage residence time is first solid-liquid separation zone: first treatment zone: intermediate zone 1: intermediate zone 2: second treatment zone: second solid-liquid separation zone = 2-4:5-7:1:1:5-7:2-4.

[0019] The sewage treatment device of the present invention has the following advantages compared with the prior art: it adopts a sewage treatment method that does not require aeration, and the sewage passes through the first solid-liquid separation zone, the first treatment zone, the intermediate zone one, the intermediate zone two, the second treatment zone and the second solid-liquid separation zone in sequence in the device, and is then discharged from the second solid-liquid separation zone. The pollutants in the sewage undergo a first round of filtration, hydrolysis, acidification, methanation and liquid-solid separation in the first treatment zone, and then enter the second treatment zone for a second round of liquid-solid separation, filtration, hydrolysis, acidification and methanation, and finally purify the sewage, which can realize the function of non-powered sewage treatment and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a sewage treatment device of the present invention;

[0021] In the figure, 1. first tank body; 11. first pressure plate; 12. first solid-liquid separation zone; 13. first processing zone; 131. first filler; 14. middle zone 1; 2. second tank body; 21. second pressure plate; 22. second solid-liquid separation zone; 23. second processing zone; 231. second filler; 24. middle zone 2; 3. water inlet pipe; 4. water outlet pipe; 5. connecting pipe. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] like Figure 1 As shown, a sewage treatment device of a preferred embodiment of the present invention includes a first tank body 1, a second tank body 2, a water inlet pipe 3, a water outlet pipe 4 and a connecting pipe 5. The interior of the first tank body 1 is sequentially and segmentally isolated from bottom to top with a first solid-liquid separation zone 12, a first treatment zone 13 and an intermediate zone 14, and the first treatment zone 13 is filled with a first filler 131, hydrolytic bacteria, acid-producing bacteria and methanogens; the output end of the water inlet pipe 3 is connected to the solid-liquid separation zone; the interior of the second tank body 2 is sequentially and segmentally isolated from top to bottom with an intermediate zone 24, a second treatment zone 23 and a second solid-liquid separation zone 22, and the second treatment zone 23 is provided with a second filler 231, hydrolytic bacteria, acid-producing bacteria and methanogens; the input end of the water outlet pipe 4 is connected to the second solid-liquid separation zone 22; the connecting pipe 5 is connected to the intermediate zone 14 and the intermediate zone 24.

[0024] Based on this, the present invention adopts a sewage treatment method that does not require aeration. In this device, the sewage passes through the first solid-liquid separation zone 12, the first treatment zone 13, the intermediate zone 14, the intermediate zone 24, the second treatment zone 23 and the second solid-liquid separation zone 22 in sequence, and is then discharged from the second solid-liquid separation zone 22. The pollutants in the sewage undergo a first round of filtration, hydrolysis, acidification, methanation and liquid-solid separation in the first treatment zone 13, and then enter the second treatment zone 23 for a second round of liquid-solid separation, filtration, hydrolysis, acidification and methanation, and finally purify the sewage, which can realize the function of non-powered sewage treatment and reduce operation and maintenance costs.

[0025] Furthermore, the input end of the water inlet pipe 3 is higher than the first solid-liquid separation zone 12, and the output end of the water inlet pipe 3 opens downward and is located in the first solid-liquid separation zone 12, so that the sewage can flow into the first solid-liquid separation zone 12 quickly under the action of gravity. The sludge in the first solid-liquid separation zone 12 mainly comes from solid organic matter, detached biofilm and floc sludge. The sludge production of this process is 10% to 60% of that of the traditional activated sludge method, which can reduce the frequency of sludge cleaning and facilitate maintenance; the input end of the outlet pipe 4 opens downward and is located in the second solid-liquid separation zone 22. In order to avoid the precipitation in the second solid-liquid separation zone 22 from flowing into the outlet pipe 4, the output end of the outlet pipe 4 is higher than the second solid-liquid separation zone 22.

[0026] Furthermore, in order to prevent short-circuiting in the first solid-liquid separation zone 12 , in the horizontal direction, the output end of the water inlet pipe 3 is located in the middle of the first solid-liquid separation zone 12 , and the input end of the water outlet pipe 4 is located in the middle of the second solid-liquid separation zone 22 .

[0027] Furthermore, in order to facilitate the fixation of the first filler 131, a first pressure plate 11 is provided in the first tank body 1. The first pressure plate 11 is located at the upper and lower ends of the first treatment area 13. In order to facilitate the fixation of the second filler 231, a second pressure plate 21 is provided in the second tank body 2. The second pressure plate 21 is located at the upper and lower ends of the second treatment area 23. The first pressure plate 11 and the second pressure plate 21 are both provided with a number of through holes on their plate surfaces to facilitate the inflow and outflow of sewage. Furthermore, in order to facilitate the installation and replacement of the first filler 131, the first pressure plate 11 is detachably connected to the first tank body 1. In order to facilitate the installation and replacement of the second filler 231, the second pressure plate 21 is detachably connected to the second tank body 2. Furthermore, in order to prevent larger impurities in the sewage from clogging the through holes, the diameter of the through holes ranges from 40 mm to 60 mm. Within this range, the filler between the pressure plates can maintain its shape normally while avoiding clogging of the through holes.

[0028] Furthermore, the first filler 131 is a porous fiber filler, and the second filler 231 is a spherical filler connected by biological ropes. The porosity of the first filler 131 ranges from 80% to 95%, and the porosity of the second filler 231 ranges from 80% to 95%. The functions of the first filler 131 include intercepting solid impurities in sewage such as suspended matter and providing a large area of ​​attachment surface for hydrolytic bacteria, acid-producing bacteria and methanogens. The hydrolytic enzymes secreted by hydrolytic bacteria can accelerate the hydrolysis reaction of solid organic matter in sewage. Hydrolysis is the first step in sewage treatment reaction. It is necessary to increase the hydrolysis reaction ratio of sewage in the early stage of sewage treatment. Therefore, the concentration of hydrolytic bacteria in the first treatment zone 13 is greater than that in the second treatment zone 23. In the later stage of sewage treatment, a large amount of products after hydrolysis and acidification reactions need to be methanized. Therefore, the concentration of methanogens in the second treatment zone 23 is greater than that of methanogens in the first treatment zone 13. In order to avoid suspended matter clogging the gaps in the filler and causing poor sewage circulation, the volume filling ratio of the first filler 131 to the first treatment zone 13 is in the range of 1 / 4. The second filler 231 has a volume ratio of 20% to 60%. The function of the second filler 231 is to further filter the sewage and provide a large attachment surface for hydrolytic bacteria, acid-producing bacteria, and methanogens. The main reaction in the second treatment zone 23 is to methanize the hydrolyzed and acidified pollutants. Impurities in the sewage are reduced after filtration by the first filler 131. The volume filling ratio of the first filler 131 to the first treatment zone 13 is in the range of 40% to 80%. A larger filling ratio facilitates sufficient contact between the sewage and the filler, allowing the chemical reaction to proceed fully, thereby improving the cleanliness of the water in the outlet pipe 4. In this process, the hydrolytic bacteria, acid-producing bacteria, and methanogens have low requirements for the N and P content in the sewage, and are applicable to a wide range of sewage. Accordingly, this treatment process has a lower N and P treatment efficiency than the aerobic process, can retain N and P elements, and the purified water quality is suitable for plant irrigation, which can reduce the use of fertilizers and save plant cultivation costs.

[0029] Furthermore, in order to prevent scum in the sewage from clogging the through hole of the first pressure plate 11 at the end of the first treatment zone 13, the distance between the input end of the connecting pipe 5 and the first treatment zone 13 is in the range of 50 mm to 80 mm. Therefore, the water level must rise to a position 50 mm to 80 mm above the first pressure plate 11 before it can flow into the middle second zone 24 through the connecting pipe 5. Similarly, in order to prevent the water surface from being located exactly on the second pressure plate 21 above the second treatment zone 23, the distance between the output end of the connecting pipe 5 and the second treatment zone 23 is in the range of 50 mm to 80 mm.

[0030] Furthermore, the ratio of the time the sewage stays is the first solid-liquid separation zone 12: the first treatment zone 13: the middle zone 14: the middle zone 24: the second treatment zone 23: the second solid-liquid separation zone 22 = 2~4:5~7:1:1:5~7:2~4. Increasing the volume ratio of the first solid-liquid separation zone 12 can increase the ratio of the time the sewage stays in the first solid-liquid separation zone 12, which is suitable for sewage with more sedimentation, and vice versa for sewage with less sedimentation; increasing the volume ratio of the first treatment zone 13 can increase the ratio of the time the sewage stays in the first treatment zone 13, which is suitable for sewage with more suspended matter and sewage with a large flow rate, and can also obtain better suspended matter interception effect while ensuring the flow rate; increasing the volume ratio of the first treatment zone 13 can increase the ratio of the time the sewage stays in the second treatment zone 23, which is suitable for fully converting substances such as soluble organic matter and unsaturated fatty acids with a high content into stable substances such as methane, carbon dioxide, hydrogen sulfide, and water. Increasing the volume ratio of the second solid-liquid separation zone 22 is suitable for sewage with more sedimentation.

[0031] The working process of the present invention is as follows: first, the sewage enters the first solid-liquid separation zone 12 through the water inlet pipe 3, the solids in the sewage gradually settle to the bottom of the first solid-liquid separation zone 12, and the sewage flows into the first treatment zone 13. The first filler 131 in the first treatment zone 13 blocks the suspended matter in the sewage. At the same time, the hydrolytic bacteria, acid-producing bacteria and methanogens attached to the first filler 131 hydrolyze, acidify and methanize most of the pollutants in the sewage. Then, the sewage passes through the first treatment zone 13 upward into the middle zone 14, and then enters the middle zone 24 through the connecting pipe 5. The middle zone 24 is Suspended matter in the sewage is suspended at the top of zone 24, and the sewage flows downward into the second treatment zone 23. The hydrolytic bacteria and acid-producing bacteria attached to the surface of the second filler 231 perform secondary hydrolysis and acidification on the pollutants in the sewage. The methanogenic bacteria attached to the surface of the second filler 231 fully convert soluble organic matter and unsaturated fatty acids in the sewage into stable substances such as methane, carbon dioxide, hydrogen sulfide, and water. These substances pass through the second treatment zone 23 and reach the second solid-liquid separation zone 22 for further sedimentation. Finally, the purified sewage flows upward through the outlet pipe 4 and is discharged from the sewage treatment device.

[0032] In summary, a sewage treatment method that does not require aeration is adopted. In this device, the sewage passes through the first solid-liquid separation zone 12, the first treatment zone 13, the intermediate zone 14, the intermediate zone 24, the second treatment zone 23 and the second solid-liquid separation zone 22 in sequence, and is then discharged from the second solid-liquid separation zone 22. The pollutants in the sewage undergo a first round of filtration, hydrolysis, acidification, methanation and liquid-solid separation in the first treatment zone 13, and then enter the second treatment zone 23 for a second round of liquid-solid separation, filtration, hydrolysis, acidification, and methanation, and finally purify the sewage, which can realize the function of non-powered sewage treatment and reduce operation and maintenance costs.

[0033] It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information. In addition, the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sewage treatment method applied to a sewage treatment device, characterized in that: The sewage treatment device comprises: a first tank body, wherein the first tank body is sequentially and segmentally isolated from bottom to top with a first solid-liquid separation zone, a first treatment zone, and an intermediate zone, wherein the first treatment zone is filled with a first filler, hydrolytic bacteria, acid-producing bacteria, and methanogenic bacteria; a water inlet pipe, wherein the output end of the water inlet pipe is connected to the solid-liquid separation zone; a second tank body, wherein the interior of the second tank body is sequentially and segmentally isolated from top to bottom and comprises a second intermediate zone, a second treatment zone, and a second solid-liquid separation zone; a second filler, hydrolytic bacteria, acid-producing bacteria, and methanogens are provided in the second treatment zone; the concentration of hydrolytic bacteria in the first treatment zone is greater than that in the second treatment zone; and the concentration of methanogens in the second treatment zone is greater than that in the first treatment zone; a water outlet pipe, the input end of which is connected to the second solid-liquid separation zone; a connecting pipe, the connecting pipe connecting the first middle zone and the second middle zone; The first filler is a porous fiber filler, and the second filler is a spherical filler connected by biological ropes; The sewage treatment method comprises: The sewage passes through the first solid-liquid separation zone, the first treatment zone and the intermediate zone in sequence. The pollutants in the sewage undergo a first round of filtration, hydrolysis, acidification, methanation and liquid-solid separation in the first treatment zone. The sewage passes through the second intermediate zone, the second treatment zone, and the second solid-liquid separation zone in sequence, and the pollutants in the sewage undergo a second round of liquid-solid separation, filtration, hydrolysis, acidification, and methanation in the second treatment zone; The purified sewage is discharged from the sewage treatment device through the second solid-liquid separation zone.

2. The sewage treatment method applied to a sewage treatment device according to claim 1, characterized in that: The input end of the water inlet pipe is higher than the first solid-liquid separation zone; the output end of the water inlet pipe opens downward and is located in the first solid-liquid separation zone, the input end of the water outlet pipe opens downward and is located in the second solid-liquid separation zone, and the output end of the water outlet pipe is higher than the second solid-liquid separation zone.

3. The sewage treatment method applied to a sewage treatment device according to claim 2, characterized in that: In the horizontal direction, the output end of the water inlet pipe is located in the middle of the first solid-liquid separation zone, and the input end of the water outlet pipe is located in the middle of the second solid-liquid separation zone.

4. The sewage treatment method applied to a sewage treatment device according to claim 1, characterized in that: A first pressing plate is provided in the first tank body, and the first pressing plate is located at the upper and lower ends of the first processing area. A second pressing plate is provided in the second tank body, and the second pressing plate is located at the upper and lower ends of the second processing area. Both the first pressing plate and the second pressing plate have a plurality of through holes on their plate surfaces.

5. The sewage treatment method applied to a sewage treatment device according to claim 4, characterized in that: The first pressing plate is detachably connected to the first tank body, and the second pressing plate is detachably connected to the second tank body.

6. The sewage treatment method applied to a sewage treatment device according to claim 4, characterized in that: The diameter of the through hole ranges from 40 mm to 60 mm.

7. The sewage treatment method applied to a sewage treatment device according to claim 1, characterized in that: The distance between the input end of the connecting pipe and the first processing area is in the range of 50 mm to 80 mm, and the distance between the output end of the connecting pipe and the second processing area is in the range of 50 mm to 80 mm.

8. The sewage treatment method applied to a sewage treatment device according to claim 1, characterized in that: The ratio of sewage retention time is the first solid-liquid separation zone: the first treatment zone: the middle zone 1: the middle zone 2: the second treatment zone: the second solid-liquid separation zone = 2~4:5~7:1:1:5~7:2~4.

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