A method for transforming an existing septic tank, a buffer tank and a drainage system

Abstract

The present invention provides a method, a slow-filling tank and a drainage system based on the transformation of an existing septic tank, wherein the transformation method is as follows: a new outlet is opened, and the horizontal height of the new outlet is lower than the horizontal height of the original outlet; an interception part is arranged near the new outlet or in the downstream pipeline, the interception part is closed, the tank body stores water, and the interception part is opened, and the tank body transports water. The slow-filling tank includes a tank body, a water inlet and a water outlet opened on the tank body, and a plurality of baffles arranged inside the tank body, the baffles are arranged in sequence from the water inlet to the water outlet, and water holes are arranged on the baffles. The water outlet position of the outlet is lower than the water inlet position of the water inlet, and an interception part is arranged near the water outlet. In the present invention, the municipal combined pipe is not modified, and the problems existing in the combined pipe system are solved from the source.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal drainage, and in particular relates to a method based on the transformation of an existing septic tank, a buffer tank and a drainage system. Background Art

[0002] See also Figure 1 As shown, it is a schematic diagram of the existing combined sewer network, which includes a municipal combined pipe and a unit area. The unit area is provided with a combined branch pipe, at least one sewage branch pipe, and at least one rainwater inlet. The sewage branch pipe and the rainwater inlet are both connected to the combined branch pipe. On sunny days, the domestic sewage flowing out of the drainage riser flows into the combined branch pipe through the sewage branch pipe and enters the municipal combined pipe. On rainy days, the domestic sewage flowing out of the drainage riser is mixed with the rainwater collected by the rainwater inlet and flows into the municipal combined pipe through the combined branch pipe. If all rainwater and sewage are sent to the sewage treatment plant for treatment, on the one hand, the treatment capacity of the sewage treatment plant is limited, and on the other hand, the concentration of pollutants in the middle and late rainwater is not high. If it is sent to the sewage treatment plant for treatment, it will waste resources. Therefore, in the prior art, the existing combined sewer network is modified, and a diversion well or an interception well is set at the end of the combined branch pipe or the municipal combined pipe. The sunny sewage and initial rainwater are diverted to the sewage treatment plant through the diversion well or the interception well, and the middle and late rainwater are diverted to the natural water body.

[0003] In the process of realizing the present invention, the inventors found that the prior art has the following problems: since the sewage discharge in the sewage branch pipe is continuous and has no direct connection with rainfall, on rainy days, the sewage branch pipe continuously flows out domestic sewage and mixes with rainwater. Even the mid- and late-stage rainwater is mixed with a large amount of domestic sewage. If this part of sewage is discharged into the natural water body together with the mid- and late-stage rainwater, it is bound to cause natural water pollution. If all are sent to the sewage treatment plant, the sewage treatment plant will be under great pressure on rainy days. Therefore, the cost of both the pipeline network reconstruction and the sewage treatment plant reconstruction is very high. Summary of the invention

[0004] The technical problem to be solved by the present invention is that sewage and rainwater are mixed together and flow into the municipal combined sewer on rainy days, causing environmental pollution or high cost for reconstruction of the combined sewer network.

[0005] In order to solve the above technical problems, in the first aspect, the present invention provides a method for transforming an existing septic tank, wherein the septic tank comprises a tank body, a water inlet and a water outlet opened on the tank body, and a plurality of baffles arranged inside the tank body, wherein the baffles are arranged in sequence from the water inlet to the water outlet, and water holes are arranged on the baffles; the method is as follows:

[0006] A new water outlet is opened on the septic tank, and the level of the new water outlet is lower than the level of the original water outlet;

[0007] A cut-off portion is arranged near the new water outlet or in a downstream pipeline thereof. When the cut-off portion is closed, the pool body stores water. When the cut-off portion is opened, the pool body transports water.

[0008] Optionally, the method further includes: sealing the original water outlet of the septic tank.

[0009] Optionally, it also includes: an overflow port is opened on the pool body, and the level of the overflow port is higher than the level of the original water outlet.

[0010] Optionally, the method further includes: sealing at least one original water hole of the baffle plate close to the new water outlet, and opening a new water hole, wherein the level of the new water hole is lower than the level of the new water outlet.

[0011] Optionally, it also includes: sealing all the original water holes on the baffle plates, opening new water holes, the horizontal heights of all the new water holes are lower than the horizontal height of the new water outlets, and the water outlet positions of the water holes on all the baffle plates are at the same horizontal height.

[0012] In the second aspect, the present invention also provides a slow-fill tank based on the transformation of an existing septic tank, the slow-fill tank comprising a tank body, a water inlet and a water outlet opened on the tank body, and a plurality of baffles arranged inside the tank body, the baffles are arranged in sequence at intervals from the water inlet to the water outlet, the baffles are provided with water holes, the water outlet position of the water outlet is lower than the water inlet position of the water inlet, and a diversion portion is provided near the water outlet.

[0013] Optionally, a water outlet position of the water hole arranged on the baffle plate near the water outlet is lower than a water outlet position of the water outlet.

[0014] Optionally, the water outlet positions of the water holes on all the baffles are located at the same horizontal height.

[0015] Optionally, a slag blocking device is further included, and the slag blocking device is arranged between the water inlet and the baffle near the water inlet.

[0016] Optionally, the slag blocking device is a slag blocking plate, which extends downward from the top of the pool body, the water outlet position of the water inlet is higher than the bottom edge of the slag blocking plate, and the water outlet position of the water hole on the baffle plate near the water inlet is higher than the bottom edge of the slag blocking plate.

[0017] Optionally, the intercepting portion is any one of a flexible intercepting device, a gate, a valve, and a weir gate.

[0018] Optionally, an overflow port is further provided on the pool body, and the overflow port is located above the water outlet, and the water outlet position of the overflow port is not lower than the water outlet position of the water inlet.

[0019] In the third aspect, the present invention also provides a drainage system based on the transformation of an existing septic tank, comprising: a buffer tank based on the transformation of an existing septic tank as described in any of the above items, a unit area, and a municipal combined pipe, the unit area comprising at least one sewage branch pipe, at least one rainwater outlet and a combined branch pipe, the sewage branch pipe connecting the combined branch pipe and the buffer tank, and the rainwater outlet connected to the combined branch pipe.

[0020] Beneficial effects:

[0021] The present invention provides a method based on the reconstruction of an existing septic tank, in which the water outlet of the septic tank is lowered, thereby increasing the available space for subsequent water storage in the septic tank, and an interception portion is arranged in a pipe near the water outlet or downstream of the water outlet. On sunny days, the interception portion is opened, and sewage flowing out of the septic tank flows into the downstream sewage branch pipe and then enters the municipal combined pipe. On rainy days, the interception portion is closed, and sewage flowing out of the septic tank is temporarily stored in the reconstructed septic tank, thereby ensuring that all rainwater is not mixed with sewage and flows into the municipal combined pipe, thus avoiding the complete convergence of rainwater and sewage. Only the septic tank is expanded and reconstructed without the need to build new storage facilities. This can not only save costs and increase the speed of construction and reconstruction, but also realize the storage and transportation of sewage while reducing the use of land area, thereby solving the problems existing in the combined pipe system from the source.

[0022] The present invention provides a slow-filling tank modified based on an existing septic tank, wherein the water outlet of the slow-filling tank is located lower than the water inlet, thereby increasing the storage space in the tank body of the slow-filling tank, and an intercepting portion is arranged near the water outlet. When the intercepting portion is opened, the liquid level on the side of the slow-filling tank body near the water outlet is flush with the water outlet. When the intercepting portion is closed, the space in the slow-filling tank is used to temporarily store domestic sewage, thereby ensuring that domestic sewage is not mixed with rainwater on rainy days. In addition, the baffle in the slow-filling tank can block a portion of garbage from entering the downstream pipeline, and it is only necessary to regularly clean the garbage in the slow-filling tank, thereby simplifying maintenance.

[0023] The present invention provides a drainage system based on the transformation of an existing septic tank. The position of the water outlet of the filling tank is lower than the position of the water inlet, thereby increasing the storage space in the tank body of the slow-filling tank. An interception part is arranged near the water outlet. When the interception part is opened, the liquid level on the side of the tank body of the slow-filling tank near the water outlet is flush with the water outlet. When the interception part is closed, the space in the slow-filling tank is used to temporarily store domestic sewage, ensuring that domestic sewage and rainwater are not mixed on rainy days. There is no need to build additional receiving facilities. The slow-filling tank can meet the functions of sewage transportation and temporary storage. With less land use, the storage and transportation of sewage can be realized, thereby solving the problems existing in the combined sewer network from the source.

[0024] The present invention provides a method for transforming an existing septic tank, a buffer tank and a drainage system. The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the prior art of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the slow-charging tank of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a slow-charging tank with a slag retaining plate in the second embodiment of the present invention;

[0029] Figure 4 A schematic diagram of an overflow port provided in a slow-charging tank according to an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the drainage system of the present invention. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention; the "and / or" keyword involved in this implementation represents both and, or. In other words, A and / or B mentioned in the embodiments of the present invention represent both A and B, and A or B, and describe the three states of A and B. For example, A and / or B means: only A is included but not B; only B is included but not A; both A and B are included.

[0032] At the same time, in the embodiments of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected or communicated" with another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.

[0033] It should be noted that, in order to explain the present invention in more detail so that those skilled in the art can understand the present invention more clearly and understandably, and further support the technical problems to be solved by the present invention and the corresponding technical effects that can be achieved, before introducing the present invention, the following explanations are given for the terminology involved:

[0034] The unit area refers specifically to functional units such as residential areas, shopping malls, vegetable markets, hospitals, etc., which are areas that generate domestic sewage and transport sewage and rainwater to the municipal combined sewer pipe. For technical personnel in this field, the unit area can be a virtually demarcated area or a real area.

[0035] A combined branch pipe is a pipe used to transport rainwater, sewage, or a mixture of rainwater and sewage in a unit area; a sewage branch pipe is a facility used to transport sewage in a unit area; a stormwater inlet is a facility used to transport rainwater to the combined branch pipe in a unit area; a municipal combined pipe is a pipe used to transport rainwater or sewage or a mixture of rainwater and sewage in a municipal pipeline.

[0036] Downstream refers to a set reference position through which water flows. The area before the reference position is the upstream, and the area after the reference position is the downstream.

[0037] According to whether rainfall occurs, the period involved in the present invention can be divided into rainy days and sunny days, that is, it can be understood as a rainfall period and a non-rainfall period, wherein the rainfall period refers to the period when rainfall occurs, which can be understood as a rainy day; the non-rainfall period is a period opposite to the rainfall period, which refers to the period when no rainfall occurs, which can be understood as a sunny day. Alternatively, according to the amount of rainfall, the period involved in the present invention can also be divided into a rainfall period and a non-rainfall period, wherein the rainfall period refers to the period when the rainfall reaches a certain rainfall threshold, which can be understood as a period when the rainfall is slightly larger; the non-rainfall period is a period opposite to the rainfall period, which refers to the period when the rainfall is less than the rainfall threshold, which can be understood as a period when there is no rainfall or the rainfall is relatively small.

[0038] In the present invention, it is not limited to which of the above methods is used to determine the rainfall period and the non-rainfall period, and it can be selected and determined according to actual operation requirements; in other words, any of the above methods for determining the rainfall period and the non-rainfall period is applicable to the present invention. As for how to judge whether rainfall occurs and how to judge whether the rainfall reaches a certain rainfall threshold, the judgment method of the prior art can be adopted. The present invention no longer limits the judgment method for whether rainfall occurs and the judgment method for whether rainfall reaches a certain rainfall threshold. As long as the judgment method can achieve the judgment result of whether rainfall occurs or whether rainfall reaches a certain rainfall threshold, it is applicable to the present invention.

[0039] Of course, those skilled in the art should understand that since certain errors are allowed in the discharge of rainwater and / or sewage during actual operations, there may be certain errors in the specific division of each period. For example, there may be inaccurate division nodes between initial rain and mid- and late-stage rain, resulting in mid- and late-stage rain mixed with initial rain, or a small amount of sewage mixed with initial rain / mid- and late-stage rain, etc. The operational impact caused by this error does not affect the implementation effect of the entire technical solution of the present invention and can be ignored, and should not be considered to be beyond the protection scope of the present invention.

[0040] Embodiment 1

[0041] The septic tank includes a tank body, a water inlet and a water outlet provided on the tank body, and a plurality of baffles provided inside the tank body. The baffles are provided at intervals in the direction from the water inlet to the water outlet, and water holes are provided on the baffles. Since the water inlet and the water outlet of the septic tank in the prior art are respectively provided on the two opposite side walls of the tank body, and both are located above the side walls near the top of the tank body, this structure causes the space in the septic tank to be basically filled, and there is insufficient free space in the septic tank. When renovating the combined sewer network, the space in the septic tank cannot be used. If the septic tank is demolished and a larger septic tank is newly built, there are not only problems of long construction period and small construction space, but also the space in a general residential area is limited, and there is not enough space to install a septic tank, making the renovation difficult.

[0042] Based on this, this embodiment provides a method based on the transformation of an existing septic tank, which has a small construction space, low transformation difficulty, and a wide range of applications. Please refer to Figure 2 , the method is as follows:

[0043] A new water outlet will be opened, and the level of the new water outlet is lower than the level of the original water outlet, that is, the pipe bottom elevation of the new water outlet is lower than the pipe bottom elevation of the original water outlet;

[0044] An interception part is arranged near the new water outlet or in the downstream pipeline thereof, the interception part is closed, the tank body stores water, the interception part is opened, and the tank body transports water. Preferably, the septic tank is connected to the downstream pipeline through the inspection well, and the interception part can be arranged at the outlet of the septic tank, or the interception part can be arranged at the entrance of the downstream inspection well, which can be arranged specifically according to the actual situation. In this embodiment, the outlet position of the septic tank is lowered. When it rains, after the interception part 3 is closed, part of the space in the septic tank can be used to temporarily store sewage, make full use of existing facilities, increase the sewage storage capacity, reduce the risk of sewage overflow, and reduce the construction and transformation cost. In this embodiment, if the rainfall duration is too long, too much sewage is generated in the unit area, and the septic tank and the area where it is located may be flooded with sewage. The original water outlet of the septic tank is retained as an overflow port, not only a part of the tank body volume is used to store sewage on rainy days, but also the original water outlet is used as an overflow port to drain water in an emergency, protecting the septic tank and the area where it is located from being flooded with sewage, and the transformation cost is low.

[0045] Furthermore, the original outlet of the septic tank is blocked. The volume of the septic tank is fully utilized, and the amount of sewage that can be stored is further increased. On sunny days, the interception part is opened, and the domestic sewage in the septic tank flows out from the new outlet. On rainy days, the interception part is closed, and the septic tank temporarily stores domestic sewage. After the weather clears up, the interception part is opened again, and the domestic sewage flows out from the new outlet.

[0046] Furthermore, an overflow port is provided on the tank body, and the horizontal height of the overflow port is higher than the horizontal height of the original outlet. Preferably, the overflow port is provided at a position close to the top of the tank body, so as to maximize the use of the internal volume of the septic tank while ensuring the safe operation of the septic tank. On sunny days, the interception part is opened, and the domestic sewage in the septic tank flows out from the new outlet. On rainy days, the interception part is closed, and the septic tank temporarily stores domestic sewage. After the weather clears up, the interception part is opened again, and the domestic sewage flows out from the new outlet. If the domestic sewage gradually increases and fills the septic tank on rainy days, the excess domestic sewage flows downstream from the overflow port to prevent the domestic sewage from flooding the septic tank and the area where it is located.

[0047] Furthermore, in this embodiment, at least one original water hole of a baffle plate near the water outlet is blocked, and a new water hole is opened. The horizontal height of the new water hole is lower than the horizontal height of the new water outlet, that is, the pipe top elevation of the new water hole is lower than the pipe bottom elevation of the new water outlet. The baffle plate in the septic tank also has the function of blocking slag, preventing garbage in domestic sewage from entering the downstream pipe. The garbage in the septic tank is cleaned regularly using a sewage suction truck, which is convenient for maintenance and has low transformation cost. By lowering the water outlet position of the water hole of the baffle plate, the space for storing sewage in the septic tank is further increased.

[0048] Furthermore, in the present embodiment, the original water holes of all baffles are blocked, new water holes are opened, the horizontal heights of all new water holes are lower than the horizontal height of the new water outlet, and the horizontal heights of all new water holes are at the same horizontal height. This structure maximizes the storage space of the septic tank while realizing the function of blocking slag. Specifically, if the septic tank in the present embodiment is provided with two baffles, the new water holes of the two baffles can be set at the same horizontal height, and the horizontal heights of all new water holes are lower than the horizontal height of the new water outlet of the septic tank. In the present embodiment, while meeting the function of blocking slag, the space in the septic tank is fully utilized for temporary sewage storage, and the renovation cost of the septic tank is low and the construction period is short.

[0049] Preferably, the intercepting portion 3 in this embodiment is selected from a weir gate, a gate, a valve or a flexible intercepting device. If a flexible intercepting device is directly inserted into the pipe wall of the water outlet, the installation structure is simple and occupies little space.

[0050] Embodiment 2

[0051] See also Figures 2 to 4 As shown, the second embodiment provides a slow-filling tank based on the transformation of an existing septic tank. The slow-filling tank 4 includes a tank body 40, a water inlet 41 and a water outlet 42 opened on the tank body 40, and a plurality of baffles 43 arranged inside the tank body 40. The baffles 43 are arranged in sequence from the water inlet 41 to the water outlet 42. The baffles 43 are provided with water holes 44. The water outlet 42 of the slow-filling tank is connected to the sewage branch pipe 10, and the water outlet position of the water outlet 42 is lower than the water inlet position of the water inlet 41. A interception part 3 is arranged near the water outlet 42. When the interception part 3 is closed, a part of the space in the slow-filling tank 4 can be used to store domestic sewage. The baffles 43 in the slow-filling tank 4 can block a part of the garbage pollutants from flowing into the downstream pipeline. The garbage is deposited in front of the baffles 43. Later, the slow-filling tank can be cleaned regularly using a sewage cleaning vehicle.

[0052] Furthermore, Figure 4 Schematic diagram of the overflow port of the slow-fill tank according to the embodiment of the present invention, see Figure 4 As shown, in this embodiment, an overflow port 46 is also provided on the pool body 40, and the overflow port 46 is located above the water outlet 42, and the water outlet position of the overflow port 46 is not lower than the water outlet position of the water inlet 41. Specifically, the overflow port 46 and the water outlet 42 are opened on the same side of the pool wall of the pool body 40. Preferably, the overflow port 46 is arranged at a position close to the top of the pool body 40, so as to maximize the use of the volume inside the slow-charging pool while ensuring the safe operation of the slow-charging pool.

[0053] The specific use of the slow-filling tank is as follows: on sunny days, the interception part 3 is opened, and the domestic sewage in the slow-filling tank flows out from the outlet 42; on rainy days, the interception part 3 is closed, and the slow-filling tank temporarily stores domestic sewage. After the weather is clear, the interception part 3 is opened again, and the domestic sewage flows out from the outlet 42. If the domestic sewage gradually increases and fills the slow-filling tank on rainy days, the excess domestic sewage flows downstream from the overflow port to prevent the domestic sewage from flooding the slow-filling tank and the area where it is located.

[0054] Furthermore, in the second embodiment, two baffles 43 are arranged in the slow-filling tank, and the two baffles 43 are arranged in the tank body 40 at intervals, dividing the space in the tank body 40 into a number of water-passing spaces, which are the first-level water-passing area, the second-level water-passing area and the third-level water-passing area from the water inlet 41 to the water outlet 42, respectively. The water outlet position of the water-passing hole 44 arranged on the baffle 43 near the water outlet 42 is lower than the water outlet position of the water outlet 42, that is, the horizontal line where the pipe top elevation of the water-passing hole 44 is located is lower than the horizontal line where the pipe bottom elevation of the water outlet 42 is located. The space for storing sewage in the second-level water-passing area and the third-level water-passing area is further increased, and the baffles 43 in the slow-filling tank can block a part of the garbage pollutants from flowing into the downstream pipeline, and the various water-passing areas of the slow-filling tank are regularly cleaned using a sewage cleaning vehicle.

[0055] Furthermore, in the second embodiment, the water outlet positions of the water holes 44 on all the baffles 43 are set at the same horizontal height, and the water outlet positions of the water holes 44 set on all the baffles 43 are lower than the water outlet position of the water outlet 42, that is, the horizontal line where the pipe top elevation of the water holes 44 is located is lower than the horizontal line where the pipe bottom elevation of the water outlet 42 is located. Similarly, if two baffles 43 are provided, the storage space of the first-level water passing area, the second-level water passing area, and the third-level water passing area are all enlarged, while meeting the slag blocking and intercepting functions, the storage space of the buffer tank is further increased.

[0056] Further, such as Figure 3 As shown, it is a schematic diagram of the structure of the slow-filling tank with a slag retaining plate in this embodiment. In the second embodiment, the slow-filling tank 4 also includes a slag retaining device, which is arranged between the water inlet 41 and the side baffle 43 close to the water inlet 41. If two baffles 43 are arranged as described above, the slag retaining device is specifically arranged in the first-level water flow area. The floating objects or suspended objects in the water entering the slow-filling tank 4 are blocked by the slag retaining device to prevent them from entering the next-level water flow area.

[0057] As a further preferred embodiment, the slag blocking device in this embodiment is a slag blocking plate 45, which is arranged between the water inlet 41 and the baffle 43 near the water inlet 41, and extends downward from the top of the pool body 40. The bottom elevation of the water holes 44 on the water inlet 41 and the baffle 43 near the water inlet 41 is higher than the lower edge of the slag blocking plate 45, and the floating slag in the water entering the pool body 40 from the water inlet 41 is blocked at the front by the slag blocking plate 45, which has a simple structure and is convenient for later maintenance and cleaning of the first-level water flow area. For those skilled in the art, the slag blocking plate 45 is not the only structure for the slag blocking device, and a slag blocking buoy, a floating baffle, a horizontal grille or a rotary grille can also be provided, as long as it can intercept the garbage in the first-level water flow area or clean it out from the first-level water flow area.

[0058] Further preferably, the water inlet 41 and the water hole 44 on the baffle plate 43 near the water inlet 41 are arranged opposite to each other, and both extend downward from the top of the tank body 40. Specifically, the water inlet 41 of the slow-charging tank is arranged near the top of the tank body 40, and the water outlet position of the water hole 44 on the baffle plate 43 near the water inlet 41 is at the same horizontal height as the water outlet position of the water inlet 41. All garbage is intercepted in the first-level water-passing area by the slag-blocking plate 45, and only the first-level water-passing area needs to be cleaned, which is convenient for the maintenance of the slow-charging tank 4.

[0059] Preferably, the intercepting portion 3 in this embodiment can be a device such as a gate, a weir gate, a flexible intercepting device installed in a well structure such as an installation well, or it can be a flexible intercepting device directly plugged into a pipeline. For those skilled in the art, as long as the device can achieve the conduction or cutoff of water flow at the location of the intercepting portion 3, it is within the protection scope of the present invention.

[0060] Embodiment 3

[0061] See also Figure 5 As shown, the third embodiment provides a drainage system based on the transformation of an existing septic tank, including the buffer tank 4, the unit area 1 and the municipal combined pipe 2 of the above-mentioned second embodiment; wherein, the unit area 1 includes at least one sewage branch pipe 10, at least one rainwater inlet 11, and a combined branch pipe 12, the sewage branch pipe 10 connects the buffer tank 4 and the combined branch pipe 12, the rainwater inlet 11 is connected to the combined branch pipe 12, and the end of the combined branch pipe 12 is connected to the municipal combined pipe 2, wherein the sewage branch pipe 10 and the rainwater inlet 11 are both connected to the combined branch pipe 12, but there is no direct connection between the sewage branch pipe 10 and the rainwater inlet 11.

[0062] In this embodiment, the specific structure of the slow-filling tank 4 is referred to in the second embodiment and will not be described again. In the drainage system, on sunny days, the interception part 3 is opened, and the domestic sewage flowing out of the unit area 1 is blocked by the slow-filling tank 4 and then flows out from the sewage branch pipe 10 to the municipal combined pipe 2. On rainy days, the interception part 3 is closed, and the domestic sewage flowing out of the unit area 1 is temporarily stored in the slow-filling tank 4. At this time, the rainwater gathered by the rainwater outlet 11 is transported to the municipal combined pipe 2. After the weather is clear, the interception part 3 is opened again to transport the temporarily stored domestic sewage to the municipal combined pipe 2. On sunny days, the municipal combined pipe 2 transports domestic sewage, and on rainy days, the municipal combined pipe 2 transports rainwater. There is no need to modify the municipal combined pipe 2. Only the slow-filling tank 4 in the unit area 1 can meet the functions of sewage transportation and temporary storage. Under the condition of less land use, the storage and transportation of sewage is realized, and the mixing of rainwater and domestic sewage is avoided from the source, solving the problems existing in the combined pipe network from the source.

[0063] Finally, it should be noted that although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for transforming an existing septic tank, the septic tank comprising a tank body, a water inlet and a water outlet opened on the tank body, and a plurality of baffles arranged inside the tank body, the baffles being arranged in sequence from the water inlet to the water outlet, and the baffles being provided with water holes; the method is as follows: Opening a new water outlet, wherein the level of the new water outlet is lower than the level of the original water outlet; A cut-off portion is arranged near the new water outlet or in a downstream pipeline thereof, the cut-off portion is closed, the pool body stores water, and the cut-off portion is opened, the pool body transports water; Blocking the original water outlet of the septic tank; An overflow port is provided on the pool body, wherein the level of the overflow port is higher than the level of the original water outlet; At least one original water hole of the baffle plate close to the new water outlet is blocked, and a new water hole is opened, and the level of the new water hole is lower than the level of the new water outlet.

2. A method for transforming an existing septic tank as claimed in claim 1, characterized in that: Also includes: All the original water holes on the baffles are blocked, and new water holes are opened. The horizontal heights of all the new water holes are lower than the horizontal height of the new water outlets, and the water outlet positions of the water holes on all the baffles are at the same horizontal height.

3. A slow-filling tank based on the transformation of an existing septic tank, characterized in that: The slow-filling tank comprises a tank body, a water inlet and a water outlet provided on the tank body, and a plurality of baffles provided inside the tank body, wherein the baffles are arranged in sequence from the water inlet to the water outlet, and water holes are provided on the baffles, the water outlet position of the water outlet is lower than the water inlet position of the water inlet, and a intercepting portion is provided near the water outlet; The water outlet position of the water hole arranged on the baffle plate near the water outlet is lower than the water outlet position of the water outlet; The water outlet positions of the water holes on all the baffles are located at the same horizontal height; It also includes a slag blocking device, which is arranged between the water inlet and the baffle near the water inlet.

4. A slow-filling tank based on the transformation of an existing septic tank as claimed in claim 3, characterized in that: The slag blocking device is a slag blocking plate, which extends downward from the top of the pool body. The water outlet position of the water inlet is higher than the bottom edge of the slag blocking plate, and the water outlet position of the water hole on the baffle plate near the water inlet is higher than the bottom edge of the slag blocking plate.

5. A slow-filling tank based on the transformation of an existing septic tank as claimed in claim 3, characterized in that: The intercepting portion is any one of a flexible intercepting device, a gate, a valve, and a weir gate.

6. A slow-filling tank based on the transformation of an existing septic tank as claimed in claim 3, characterized in that: The pool body is also provided with an overflow port, which is located above the water outlet, and the water outlet position of the overflow port is not lower than the water outlet position of the water inlet.

7. A drainage system based on the transformation of an existing septic tank, characterized in that: include: A slow-fill tank, unit area, and municipal combined pipe based on the transformation of an existing septic tank as described in any one of claims 3 to 6, wherein the unit area includes at least one sewage branch pipe, at least one rainwater inlet, and a combined branch pipe, the sewage branch pipe connects the combined branch pipe and the slow-fill tank, and the rainwater inlet is connected to the combined branch pipe.

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