Secondary sedimentation tank system for sewage treatment

Abstract

The utility model relates to a secondary sedimentation tank system for sewage treatment, which is characterized in that a water distribution well comprises a central sludge cavity, a water inlet cavity and a water outlet cavity, a secondary sedimentation tank comprises a separation cavity provided with a single-pipe suction dredger, the upper end of the single-pipe suction dredger is provided with a rotatable scum scraper, the free end of the scum scraper is provided with a scum baffle, and the upper end of the separation cavity is provided with a water outlet channel and a water inlet channel. The bottom end of the water inlet cavity of the water distribution well is provided with a biochemical pool water inlet pipe, the bottom end of the water outlet cavity of the water distribution well is provided with a plurality of water drainage pipes, and the water drainage pipes are communicated with the water inlet channels in the corresponding secondary sedimentation tanks respectively. A biochemical tank sludge return pipe and a plurality of sludge inlet pipes are arranged at the bottom end of the central sludge cavity of the water distribution well; a secondary sedimentation tank sludge return pipe is arranged at the bottom of the separation cavity of the secondary sedimentation tank and is connected with the corresponding sludge inlet pipe at the bottom end of the central sludge cavity. The structure of the water distribution well is further simplified, more sludge can be reserved, and meanwhile the sludge backflow efficiency and the water treatment capacity are improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, specifically a secondary sedimentation tank system for wastewater treatment. Background Technology

[0002] In recent years, with increasingly stringent environmental standards for wastewater treatment and stricter controls on the land use of wastewater treatment plants, new secondary sedimentation tank and water distribution well systems have emerged in existing technologies. For example, patent CN203144163U discloses a multifunctional water distribution well and system for a secondary sedimentation tank, which includes a central inlet chamber, an inlet channel, a sludge collection channel, and an outlet channel arranged sequentially from the inside out. This system can centrally configure the inlet, outlet, and sludge return of the secondary sedimentation tank, as well as the sludge return of the biological reactor, thereby reducing the land area and operational complexity. Patent CN215975133U also discloses a secondary sedimentation tank water distribution well structure to prevent sludge deposition. It also has a central inlet channel, but this system first sets up an outlet channel around the central inlet channel, and then sets up a sludge collection channel around the outlet channel. The above systems all utilize sludge collection channels to achieve sludge retention and discharge. However, the limited volume of these channels restricts the amount of sludge that can be returned. For wastewater with large volumes, such as industrial park wastewater, the above structure needs further improvement. Utility Model Content

[0003] The purpose of this utility model is to provide a secondary sedimentation tank system for sewage treatment, which has a simplified water distribution well structure and can retain more sludge. At the same time, the sludge from each secondary sedimentation tank is first discharged to the central sludge chamber of the water distribution well, and then uniformly returned to the biological treatment tank, which also improves the sludge return efficiency.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A secondary sedimentation tank system for wastewater treatment includes a distribution well and a secondary sedimentation tank. The distribution well has a central sludge chamber, an inlet chamber, and an outlet chamber arranged sequentially from the inside out. The inlet chamber and the outlet chamber are connected at their upper ends by a water passage. The secondary sedimentation tank has a separation chamber containing a single-pipe sludge suction machine. The upper end of the single-pipe sludge suction machine has a rotatable scum scraper, and the free end of the scum scraper has a scum baffle. The upper inner wall of the separation chamber has an outlet channel and an inlet channel arranged sequentially from the inside out. The bottom of the inlet channel has a water distribution hole that communicates with the separation chamber. The water in the upper part of the separation chamber overflows into the outlet channel through the gaps in the scum baffle. The bottom of the water inlet chamber of the water distribution well is equipped with a biological treatment tank water inlet pipe, and the bottom of the outlet chamber is equipped with multiple drainage pipes. Each drainage pipe is connected to the water inlet channel in the corresponding secondary sedimentation tank. The bottom of the central sludge chamber of the water distribution well is equipped with a biological treatment tank return sludge pipe and multiple sludge inlet pipes. The bottom of the separation chamber of the secondary sedimentation tank is equipped with a secondary sedimentation tank sludge return pipe. One end of the secondary sedimentation tank sludge return pipe is connected to a single-pipe sludge suction machine, and the other end is connected to the corresponding sludge inlet pipe at the bottom of the central sludge chamber.

[0006] The water inlet channel is equipped with an inlet pipe connected to a corresponding drain pipe, and the inlet pipe is equipped with a control valve to control the on / off state.

[0007] The water distribution well has a water chamber partition wall between the water inlet chamber and the water outlet chamber, and the upper end of the water chamber partition wall has a water passage.

[0008] The lower side of the water inlet channel is provided with a first guide baffle and a second guide baffle to guide the flow of water from the water distribution hole.

[0009] A water channel partition is provided between the inlet channel and the outlet channel, and the height of the water channel partition is lower than the height of the pool opening of the secondary sedimentation tank. The height of the inner wall of the outlet channel is lower than the height of the water channel partition, and an outlet triangular weir is provided on the outlet channel.

[0010] The width of the inlet channel gradually narrows along the direction of water flow, the width of the outlet channel gradually widens along the direction of water flow, and the distance between adjacent water distribution holes gradually increases along the direction of water flow.

[0011] The water outlet channel is equipped with a water outlet pipe.

[0012] A scum discharge system is provided on one side of the separation chamber.

[0013] The scum discharge system includes a scum hopper and a scum well, wherein the scum hopper is located inside the separation chamber and is connected to the scum well located outside the separation chamber via a connecting pipe, and the scum well is equipped with a scum discharge pipe.

[0014] The sludge return pipe of the secondary sedimentation tank is equipped with a sludge return control valve to control the opening and closing of the pipeline, and the bottom of the separation chamber is equipped with a sludge discharge pipe.

[0015] The advantages and positive effects of this utility model are as follows:

[0016] 1. The water distribution well of this utility model consists of a central sludge chamber, an inlet chamber, and an outlet chamber from the inside out. Compared with the existing water distribution well, which typically consists of a central inlet chamber, an inlet channel, a sludge collection channel, and an outlet channel from the inside out, the structure of the water distribution well of this utility model is further simplified. At the same time, the volume of the central sludge chamber is increased, which can hold more return sludge. It is especially suitable for wastewater treatment with large water volume, such as industrial park wastewater and large municipal sewage treatment plants.

[0017] 2. This utility model connects the single-pipe sludge suction machine in each secondary sedimentation tank to the central sludge chamber in the middle of the water distribution well through the sludge return pipe of the secondary sedimentation tank. In this way, the sludge settled in each secondary sedimentation tank can be uniformly returned to the biological treatment tank through the central sludge chamber. Compared with the prior art where the sludge settled in each secondary sedimentation tank is individually controlled to return to the biological treatment tank, this utility model improves the sludge return efficiency and is also easier to control.

[0018] 3. The water distribution well of this utility model can be connected to multiple secondary sedimentation tanks, thereby further increasing the water treatment capacity, and is especially suitable for wastewater with large volume, such as industrial park wastewater and large municipal sewage treatment plants. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall layout of this utility model.

[0020] Figure 2 for Figure 1 A top view of the central distribution well.

[0021] Figure 3 for Figure 2 AA view in

[0022] Figure 4 for Figure 2 BB view in

[0023] Figure 5 for Figure 1 A top view of the secondary settling tank.

[0024] Figure 6 for Figure 5 CC view in

[0025] Figure 7 for Figure 6 Enlarged view of point K in the image.

[0026] Figure 8 for Figure 5 A top view of the structure after the circular inlet and outlet channels are fully extended into straight lines.

[0027] Among them, 1 is the secondary sedimentation tank, 101 is the inlet channel, 1011 is the inlet pipe, 1012 is the water distribution hole, 102 is the outlet channel, 1021 is the outlet pipe, 1022 is the outlet triangular weir, 103 is the single-pipe sludge suction machine, 1031 is the scum scraper, 1032 is the truss, 1033 is the working bridge, 1034 is the sludge suction pipe, 104 is the scum discharge system, 1041 is the scum hopper, 1042 is the connecting pipe, 1043 is the scum well, 1044 is the scum discharge pipe, 105 is the sludge return pipe of the secondary sedimentation tank, and 1051 is the sludge... The system includes a return flow control valve, a separation chamber (106), a sludge discharge pipe (107), a water channel baffle (108), a first guide baffle (109), a second guide baffle (110), a scum baffle (111), a water distribution well (2), a biological treatment tank water inlet pipe (201), a biological treatment tank sludge return pipe (202), a first sludge inlet pipe (203), a first drain pipe (204), a second sludge inlet pipe (205), a second drain pipe (206), a central sludge chamber (207), an inlet chamber (208), an outlet chamber (209), a water chamber partition wall (210), and a water passage (211). Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] like Figures 1-8 As shown, this utility model includes a water distribution well 2 and multiple secondary sedimentation tanks 1, wherein, as Figures 2-4 As shown, the water distribution well 2 is provided with a central sludge chamber 207, an inlet chamber 208, and an outlet chamber 209 sequentially from the inside to the outside, and the upper ends of the inlet chamber 208 and the outlet chamber 209 are connected by a water passage 211. Figures 5-8 As shown, the secondary sedimentation tank 1 is provided with a separation chamber 106, and a single-tube sludge suction machine 103 is provided inside the separation chamber 106. The upper end of the single-tube sludge suction machine 103 is provided with a rotatable scum scraper 1031, and the free end of the scum scraper 1031 is provided with a scum baffle 111. Figure 7 As shown, the upper inner wall of the separation chamber 106 is provided with an outlet channel 102 and an inlet channel 101 from the inside to the outside. The inlet channel 101 has a water distribution hole 1012 at its bottom that communicates with the separation chamber 106. Water in the upper part of the separation chamber 106 overflows into the outlet channel 102 through the gap in the scum baffle 111. The water in the outlet channel 102 is discharged into the next process. Additionally, as shown... Figure 3 As shown, the bottom of the inlet chamber 208 of the water distribution well 2 is provided with a biochemical tank water inlet pipe 201, and the bottom of the outlet chamber 209 is provided with multiple drain pipes, wherein the drain pipes are respectively connected to the inlet channel 101 in the corresponding secondary sedimentation tank 1, such as... Figure 4 As shown, the bottom of the central sludge chamber 207 is equipped with a biological treatment tank return sludge pipe 202 and multiple sludge inlet pipes, such as... Figure 6 As shown, the bottom of the separation chamber 106 of the secondary sedimentation tank 1 is provided with a secondary sedimentation tank sludge return pipe 105, and one end of the secondary sedimentation tank sludge return pipe 105 is connected to the single-pipe sludge suction machine 103, and the other end is connected to the sludge inlet pipe corresponding to the bottom end of the central sludge chamber 207.

[0030] like Figures 1-4 As shown, in this embodiment, the water distribution well 2 is connected to two secondary sedimentation tanks 1. The bottom of the central sludge chamber 207 is provided with a first sludge inlet pipe 203 and a second sludge inlet pipe 205, which are respectively connected to the sludge return pipe 105 in the corresponding secondary sedimentation tank 1. Additionally, the bottom of the outlet chamber 209 is provided with a first drain pipe 204 and a second drain pipe 206, which are respectively connected to the inlet channel 101 in the corresponding secondary sedimentation tank 1. Figure 5 As shown, the water inlet channel 101 is provided with a water inlet pipe 1011 connected to a corresponding drain pipe, and a control valve for controlling the on / off state can be installed on the water inlet pipe 1011.

[0031] like Figure 3As shown in this embodiment, a water cavity partition wall 210 is provided between the water inlet cavity 208 and the water outlet cavity 209 of the water distribution well 2, and a water passage 211 connecting the water inlet cavity 208 and the water outlet cavity 209 is provided at the upper end of the water cavity partition wall 210.

[0032] like Figures 6-7 As shown in this embodiment, the lower side of the water inlet channel 101 is provided with a first guide baffle 109 and a second guide baffle 110 to guide the flow of water from the water distribution hole 1012. The first guide baffle 109 and the second guide baffle 110 can guide the water from the water distribution hole 1012 to flow as obliquely downward as possible towards the center of the bottom of the separation chamber 106. After the water reaches the center of the bottom of the separation chamber 106, it flows upward. After reaching the top of the water surface, it radiates outwards and finally reaches the scum baffle 111 around the separation chamber 106.

[0033] like Figures 6-7 As shown, a water channel partition 108 is provided between the inlet channel 101 and the outlet channel 102, and the height of the water channel partition 108 is lower than the height of the pool opening of the secondary sedimentation tank 1. The height of the inner wall of the outlet channel 102 is lower than the height of the water channel partition 108, and an outlet triangular weir 1022 is provided on the outlet channel 102. The water in the upper end of the separation chamber 106 passes through the gap on the scum baffle 111 and then overflows into the outlet channel 102 through the outlet triangular weir 1022. Water level gauges and other detection elements can be installed in the inlet channel 101 and the outlet channel 102 as needed to detect the water level in the channel in real time.

[0034] like Figure 8 As shown, the width of the inlet channel 101 gradually narrows along the water flow direction, the width of the outlet channel 102 gradually widens along the water flow direction, and the spacing between adjacent water distribution holes 1012 gradually increases along the water flow direction. This utility model achieves the purpose of uniform water distribution around the channel through the above structure.

[0035] like Figure 5 As shown, the water outlet channel 102 is equipped with a water outlet pipe 1021 that is connected to the pipeline of the next process.

[0036] The single-tube sludge suction machine 103 is a well-known technology in the art and a commercially available product. In this embodiment, the manufacturer of the single-tube sludge suction machine 103 is Shenyang Daliao Environmental Machinery Equipment Co., Ltd. It has a scum scraper 1031 on one side of its upper end and a truss 1032 on the other side. Simultaneously, a working bridge 1033 is provided at the upper end of the separation chamber 106, connecting to the single-tube sludge suction machine 103 for easy maintenance. When the scum scraper 1031 rotates, it scrapes away the scum on the water surface. Figure 5 As shown, a scum discharge system 104 is provided on one side of the separation chamber 106, and the scum scraper 1031 scrapes the scum into the scum discharge system 104 and discharges it away.

[0037] like Figure 5 As shown, in this embodiment, the scum discharge system 104 includes a scum hopper 1041 and a scum well 1043. The scum hopper 1041 is located inside the separation chamber 106 and is connected to the scum well 1043 located outside the separation chamber 106 via a connecting pipe 1042. The scum well 1043 is equipped with a scum discharge pipe 1044. When the scum scraper 1031 rotates past the scum hopper 1041, the scrapers and other components on the scum hopper 1041 can cause the scum to automatically fall into the scum hopper 1041 and be periodically cleaned and discharged. The scum hopper 1041 is a technology known in the art.

[0038] like Figure 6 As shown in this embodiment, the sludge return pipe 105 of the secondary sedimentation tank is equipped with a sludge return control valve 1051 for controlling the opening and closing of the pipeline, which is a commercially available product.

[0039] like Figure 6 As shown, in this embodiment, the bottom of the separation chamber 106 is provided with a sludge discharge pipe 107 for emptying the sludge in the separation chamber 106.

[0040] The working principle of this utility model is as follows:

[0041] When this utility model is working, such as Figure 3 As shown, water from the biological treatment tank enters the inlet chamber 208 of the distribution well 2 through the biological treatment tank inlet pipe 201, and then overflows into the outer outlet chamber 209 through the upper water passage 211. The water in the outlet chamber 209 flows into the corresponding inlet channel 101 of the secondary sedimentation tank 1 through various drainage pipes. Figure 7 As shown, water in the inlet channel 101 flows into the separation chamber 106 through each water distribution hole 1012. Then, the water in the separation chamber 106 overflows from the gap of the upper scum baffle 111 and enters the outlet channel 102. The water in the outlet channel 102 finally flows out to the next process. In addition, sludge and impurities in the water are separated and settled in the separation chamber 106. The lower end of the single-pipe sludge suction machine 103 is equipped with a sludge suction pipe 1034 for sucking up the sludge that has been scraped off. The sludge sucked by the single-pipe sludge suction machine 103 flows into the central sludge chamber 207 of the distribution well 2 through the sludge return pipe 105 of the secondary sedimentation tank, and finally flows back to the biological treatment tank through the sludge return pipe 202 of the biological treatment tank.

[0042] The water distribution well of this utility model consists of a central sludge chamber 207, an inlet chamber 208, and an outlet chamber 209 from the inside out. Compared with the existing water distribution well, which usually consists of a central inlet chamber, an inlet channel, a sludge collection channel, and an outlet channel from the inside out, the structure of the water distribution well of this utility model is further simplified. At the same time, the volume of the central sludge chamber 207 is increased, which can hold more return sludge, making it especially suitable for wastewater treatment with large water volume.

[0043] This invention connects the single-pipe sludge suction machine 103 in each secondary sedimentation tank 1 to the central sludge chamber 207 in the middle of the water distribution well 2 through the secondary sedimentation tank sludge return pipe 105. In this way, the sludge settled in each secondary sedimentation tank 1 can first be returned to the central sludge chamber 207, and then uniformly returned to the biological treatment tank through the central sludge chamber 207. Compared with the prior art where the sludge settled in each secondary sedimentation tank 1 is returned to the biological treatment tank separately, this invention improves the sludge return efficiency and is also easier to control.

Claims

1. A secondary sedimentation tank system for wastewater treatment, characterized by: The application relates to a water distribution well (2) and a secondary sedimentation tank (1), wherein the water distribution well (2) is sequentially provided with a central sludge chamber (207), a water inlet chamber (208) and a water outlet chamber (209) from inside to outside, the water inlet chamber (208) and the water outlet chamber (209) are communicated through a water passing channel (211) at the upper end, the secondary sedimentation tank (1) is provided with a separation chamber (106), a single-pipe sludge suction machine (103) is arranged in the separation chamber (106), a rotatable scum scraping plate (1031) is arranged at the upper end of the single-pipe sludge suction machine (103), a scum baffle (111) is arranged at the free end of the scum scraping plate (1031), a water outlet channel (102) and a water inlet channel (101) are sequentially arranged on the inner wall of the upper end of the separation chamber (106) from inside to outside, the water inlet channel (101) is provided with water distribution holes (1012) at the bottom and communicated with the separation chamber (106), water in the upper end of the separation chamber (106) overflows into the water outlet channel (102) through the gap on the scum baffle (111), the water inlet chamber (208) of the water distribution well (2) is provided with a biochemical tank inflow pipe (201) at the bottom end, the water outlet chamber (209) is provided with a plurality of drainage pipes, and each drainage pipe is communicated with the corresponding water inlet channel (101) in the secondary sedimentation tank (1), the central sludge chamber (207) of the water distribution well (2) is provided with a biochemical tank return sludge pipe (202) and a plurality of sludge inlet pipes at the bottom end, the separation chamber (106) of the secondary sedimentation tank (1) is provided with a secondary sedimentation tank sludge return pipe (105) at the bottom, one end of the secondary sedimentation tank sludge return pipe (105) is connected with the single-pipe sludge suction machine (103), and the other end is connected with the corresponding sludge inlet pipe at the bottom end of the central sludge chamber (207).

2. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The water inlet channel (101) is provided with a water inlet pipe (1011) connected with the corresponding drainage pipe, and the water inlet pipe (1011) is provided with a control valve for controlling the on-off.

3. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The water inlet chamber (208) and the water outlet chamber (209) of the water distribution well (2) are provided with a water chamber partition wall (210), and the water chamber partition wall (210) is provided with a water passing channel (211) at the upper end.

4. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The water inlet channel (101) is provided with a first guide baffle (109) and a second guide baffle (110) for guiding the water flow direction of the water distribution holes (1012).

5. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The water inlet channel (101) and the water outlet channel (102) are provided with a water channel partition plate (108), the height of the water channel partition plate (108) is lower than the pool opening height of the secondary sedimentation tank (1), the inner side wall height of the water outlet channel (102) is lower than the height of the water channel partition plate (108), and the water outlet channel (102) is provided with a water outlet triangular weir (1022).

6. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The width of the water inlet channel (101) gradually narrows along the water flow direction, the width of the water outlet channel (102) gradually widens along the water flow direction, and the distance between adjacent water distribution holes (1012) gradually increases along the water flow direction.

7. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The water outlet channel (102) is provided with a water outlet pipe (1021).

8. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The separation chamber (106) is provided with a scum discharge system (104) on one side.

9. The secondary sedimentation tank system for wastewater treatment according to claim 8, characterized in that: The scum discharge system (104) comprises a scum bucket (1041) and a scum well (1043), wherein the scum bucket (1041) is arranged inside the separation chamber (106) and communicates with the scum well (1043) arranged outside the separation chamber (106) through a connecting pipe (1042), and the scum well (1043) is provided with a scum discharge pipe (1044).

10. The secondary sedimentation tank system for wastewater treatment according to claim 1, characterized in that: The secondary sedimentation tank sludge return pipe (105) is provided with a sludge return control valve (1051) for controlling the opening and closing of the pipeline, and the bottom of the separation chamber (106) is provided with a sludge discharge pipe (107).

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