A sewage treatment plant pump station outlet water distribution arrangement structure and outlet water distribution method

Abstract

The invention discloses an outlet water distribution arrangement structure of a sewage treatment plant pump station and an outlet water distribution method, comprising a water pump outlet trough group, a water delivery channel, an overflow weir A, an overflow weir B, and an outlet weir; the water pump outlet trough group comprises two or more water pump outlet troughs; both sides of the water pump outlet trough are respectively provided with outlet weirs; the two or more water pump outlet troughs are arranged in a row; the water delivery channel comprises a first branch of the water delivery channel, a water delivery channel B, a second branch of the water delivery channel, and a water delivery channel A; the water delivery channel B and the water delivery channel A are respectively arranged on both sides of the water pump outlet trough group; the overflow weir A and the overflow weir B are arranged at both ends of the water pump outlet trough group; the overflow weir A is connected to the second branch of the water delivery channel; the overflow weir B is connected to the first branch of the water delivery channel; the water delivery channel B and the water delivery channel A form a connected water circulation passage through the overflow weir A and the overflow weir B.

Description

Technical Field

[0001] The invention relates to the technical field of pump station rectification, and in particular to an outlet water distribution arrangement structure and an outlet water distribution method of a sewage treatment plant pump station. Background Art

[0002] In large-scale sewage treatment plants, due to the large scale of sewage lifting pump stations and the large number of water pumps, it is difficult to achieve water distribution at one time. In conventional large-scale sewage treatment plants, the sewage pump station is designed after the water pump discharges (distribution tank), and a separate water distribution well or water distribution facility needs to be added. The water distribution weir of the water distribution well or water distribution facility usually has a long weir mouth, and the horizontality of the weir is difficult to control, which can easily lead to insufficient water distribution uniformity and affect the subsequent sewage treatment effect. At the same time, in the corresponding water distribution facility, when the water pump is replaced and started and stopped, it has a great impact on the entire flow state and affects the subsequent fine screen treatment effect.

[0003] In conventional large-scale sewage treatment plants, sewage pump stations are generally designed with a weir water stop in the form of a water outlet trough after the water is discharged from the pump. The outlet troughs are all single-sided weir outflows, the water head on the weir is high, the pump head increases, and the operating costs will increase.

[0004] The water distribution well or water distribution facility needs to be equipped with an overflow pipe to return to the pump station entering the plant. The conventionally designed water distribution well or water distribution facility is a certain distance away from the pump station. The farther the distance, the longer the overflow pipe and the greater the investment. At the same time, the return pipe for the commissioning and operation of the water pump needs to be considered at the outlet of the conventional water distribution well or pump station. However, the layout of the return pipe generally increases the investment, and the setting is more complicated and difficult. In the past domestic pump station design, there was a situation where this design requirement was cancelled (cancellation is not conducive to the commissioning and operation of the pump station), and the operation, maintenance and management were more troublesome. Since there is a certain distance between the pump station and the water distribution facility, the pipeline is long, which means that the pipeline loss will increase, the operating cost will increase, and the investment in the overflow pipe and the water pump outlet pipe will be increased.

[0005] Therefore, how to ensure the water discharge and distribution of sewage lift pump stations in large sewage treatment plants while taking related functions into consideration is crucial to the subsequent design and stable operation of the entire sewage treatment plant. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the outlet design of the sewage pump station in a conventional large-scale sewage treatment plant has problems such as secondary water distribution, uniformity of water distribution, excessive head on the outlet weir of the pump station, and complex and difficult setting of the overflow pipe and the water pump debugging pipe. The purpose is to provide a water distribution layout structure and a water distribution method for lifting the outlet of the pump station to solve the problems encountered in the above-mentioned background technology.

[0007] The present invention is achieved through the following technical solutions:

[0008] A water distribution arrangement structure of a sewage treatment plant pump station, comprising a water pump outlet tank group, a water delivery channel, an overflow weir A, an overflow weir B, and a water outlet weir;

[0009] The water pump outlet trough group includes two or more water pump outlet troughs; water outlet weirs are respectively arranged on both sides of the water pump outlet trough; the two or more water pump outlet troughs are arranged in a row;

[0010] The water delivery channel includes a first branch of the water delivery channel, a water delivery channel B, a second branch of the water delivery channel, and a water delivery channel A;

[0011] The water delivery channel B and the water delivery channel A are respectively arranged on both sides of the water pump outlet trough group;

[0012] The overflow weir A and overflow weir B are arranged at both ends of the water pump outlet trough group; the overflow weir A is connected to the second branch of the water delivery channel; the overflow weir B is connected to the first branch of the water delivery channel;

[0013] The water delivery channel B and the water delivery channel A form a connected water circulation passage through the overflow weir A and the overflow weir B.

[0014] Principle of the present invention:

[0015] The present invention mainly utilizes the free outflow formula of a rectangular thin-wall weir. Under the condition of a certain outflow flow rate Q, the longer the weir length b is, the smaller the water head H on the weir is. For the arrangement of the present invention, the smaller H is, the smaller the water pump head is, and the corresponding operating energy consumption is smaller.

[0016] The free outflow formula of a rectangular thin-wall weir is:

[0017]

[0018] in

[0019] Q—outflow flow (m 3 / s);

[0020] m 0 — is the discharge coefficient of the thin-wall weir with outflow rate taking into account the effect of flow velocity;

[0021] b—length of thin-wall weir (m);

[0022] g—gravitational acceleration 9.81 (m / s 2 );

[0023] H—water head above weir (m).

[0024] For a single outlet trough of a large sewage treatment plant's inlet pump station, the conventional single-sided outlet is changed to double-sided outlet. Water transfer channels are set at the outlet ends on both sides of the water pump outlet trough to the subsequent fine screen treatment structure. The water pump outlet trough directly plays a role in water distribution, and there is no need to set up a separate water distribution well. The functions of the pump room outlet trough and the water distribution well or water distribution facility are combined into one, saving civil engineering investment, while reducing the length of the water pump outlet pipeline, reducing head loss, and saving operating costs and pipeline investment.

[0025] The above-mentioned double-sided water outlet design and layout of the water outlet pump outlet tank is adopted. It can be seen from the above formula that the water outlet weir of the water outlet tank of the water pump is doubled, and the water outlet weir also serves as a water distribution function. Since the length of a single weir is shorter, the water distribution is more uniform and more controllable. At the same time, when the water pump is switched on and off, since the water outlet water distribution of the water pump corresponds to an evenly distributed structure, combined with the layout of the water outlet tank of the water pump, it will not affect the uniformity of water distribution, which is conducive to the subsequent treatment of fine screens and strengthens the pretreatment effect of the entire sewage treatment system.

[0026] The water outlet trough of the water pump is changed from single-sided water outlet to double-sided water outlet. Due to the increase in the weir length, according to the free outflow formula of the rectangular thin-walled weir, the weir length is increased and the water head on the weir is reduced, thereby reducing the water pump head and saving operating costs. At the same time, during the design, an adjustable weir plate is set on the water outlet trough of the water pump, and the weir height can be adjusted according to actual conditions to optimize the water distribution method.

[0027] At the outlet end of the water delivery trough set on the above-mentioned two sides, overflow weirs and gates for water pump debugging are directly arranged. The corresponding overflow and debugging functions share one pipe, and since the outlet trough is closest to the water inlet end of the pump station, the combination of these two advantages can save pipeline investment. At the same time, since the functions are integrated into one, management and maintenance are also convenient. At the same time, a liquid level meter is set in the water outlet area to directly feedback the signal to control the water pump, which also ensures the safety of the system. This method is built together with the water pump outlet distribution trough to solve the problem of complex setting of overflow and water pump debugging facilities.

[0028] Further, a sewage treatment plant pump station outlet water distribution arrangement structure also includes a gate;

[0029] The gates include a first gate, a second gate, a third gate, a fourth gate, a fifth gate, and a sixth gate;

[0030] The first gate and the third gate are respectively arranged at the two ends of the water delivery channel B; the second gate is arranged in the middle of the water delivery channel B;

[0031] The fourth gate and the sixth gate are respectively arranged at the two ends of the water conveyance channel A; the fifth gate is arranged in the middle position of the water conveyance channel A.

[0032] Furthermore, a water outlet distribution arrangement structure of a sewage treatment plant pump station is provided, wherein the number of the water pump outlet troughs is an even number of 2 or more.

[0033] Furthermore, a water distribution arrangement structure of a sewage treatment plant pump station is provided, wherein ladders are provided in the water delivery channel B and the water delivery channel A.

[0034] Furthermore, a water distribution arrangement structure of a sewage treatment plant pump station is provided, wherein the bottom of the water pump outlet trough is connected to a sewage lifting and conveying pipe; the other end of the sewage lifting and conveying pipe is connected to a water pump.

[0035] Furthermore, a water distribution arrangement structure of a sewage treatment plant pump station is provided, wherein a valve is provided at the position where the bottom of the water pump outlet trough is connected to the sewage lifting and conveying pipe.

[0036] A method for distributing effluent from a sewage treatment plant pump station, comprising the following steps:

[0037] S1: The sewage treated by the coarse screen is lifted by the water pump and enters the water pump outlet tank through the sewage lifting pipe;

[0038] S2: The sewage in the water tank of the water pump flows into the water channel A and water channel B through the water outlet weir;

[0039] S3: By controlling the gates installed in water channel A and water channel B, the direction of sewage flow is controlled, flowing into the first branch of the water channel or the second branch of the water channel or into the first branch of the water channel and the second branch of the water channel at the same time, and the water is distributed to the subsequent fine screen treatment structure.

[0040] The sewage entering the sewage treatment plant is lifted by the sewage pump station to the pump outlet trough, and is evenly distributed to the water supply channel by the outlet weirs of equal length on both sides of the outlet trough. The gates of the water supply channel are used to control the water supply channel to distribute water upward and downward to the subsequent fine screen treatment structure.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] 1. Solve the problem of secondary water distribution, adopt a reasonable method to achieve the water distribution function in one time, reduce the cost, shorten the length of the pipeline, and save operating costs.

[0043] 2. Solve the problem of water distribution uniformity, reduce the impact on subsequent fine screens and treatment structures, and help enhance the sewage treatment effect.

[0044] 3. Solve the problem of too high water head on the outlet weir of large sewage treatment plant pump station, reduce the water head on the weir, reduce the pump head, and save operating costs.

[0045] 4. Solve the problem of complex and difficult setting of overflow pipe and water pump debugging pipe, reduce project investment and facilitate maintenance and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0047] Figure 1 This is a top view of the water outlet and distribution arrangement structure and the sewage lift pump room of the present invention.

[0048] Figure 2 It is a top view of the water outlet and distribution arrangement structure of the present invention.

[0049] Figure 3 This is a cross-sectional view of the water outlet and distribution arrangement structure and the sewage lift pump room of the present invention.

[0050] Figure 4 It is a cross-sectional view of the water outlet and distribution arrangement structure of the present invention.

[0051] Marks and corresponding parts names in the attached drawings:

[0052] 1-the first branch of the water supply channel, 2-the first gate, 3-the second gate, 4-the third gate, 5-the second branch of the water supply channel, 6-the fourth gate, 7-the fifth gate, 8-the sixth gate, 9-the water pump outlet trough, 10-water supply channel A, 11-water supply channel B, 12-the water pump outlet trough group, 13-outlet weir, 14-overflow weir A, 15-overflow weir B, 16-water pump, 17-weir plate, 18-ladder, 19-valve, 20-sewage lifting and delivery pipe, 21-sewage lifting pump room, 22-coarse screen channel, 23-sewage delivery pipe outside the factory. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0054] Example

[0055] like Figure 2 and Figure 4 As shown, a water distribution arrangement structure of a sewage treatment plant pump station of the present invention includes a water pump outlet tank group 12, a water delivery channel, an overflow weir A14, an overflow weir B15, and a water outlet weir 13;

[0056] The water pump outlet trough group 12 includes two or more water pump outlet troughs 9; water outlet weirs 13 are respectively provided on both sides of the water pump outlet trough 9; the two or more water pump outlet troughs 9 are arranged in a row;

[0057] The water delivery channel includes a first branch of the water delivery channel 1, a water delivery channel B11, a second branch of the water delivery channel 5, and a water delivery channel A10;

[0058] The water delivery channel B11 and the water delivery channel A10 are respectively arranged on both sides of the water pump outlet trough group 12;

[0059] The overflow weir A14 and the overflow weir B15 are arranged at both ends of the water pump outlet trough group 12; the overflow weir A14 is connected to the second branch 5 of the water delivery channel; the overflow weir B15 is connected to the first branch 1 of the water delivery channel;

[0060] The water delivery channel B11 and the water delivery channel A10 form a connected water circulation passage through the overflow weir A14 and the overflow weir B15.

[0061] Further, a sewage treatment plant pump station outlet water distribution arrangement structure also includes a gate;

[0062] The gates include a first gate 2, a second gate 3, a third gate 4, a fourth gate 6, a fifth gate 7, and a sixth gate 8;

[0063] The first gate 2 and the third gate 4 are respectively arranged at the two ends of the water delivery channel B11; the second gate 3 is arranged in the middle of the water delivery channel B11;

[0064] The fourth gate 6 and the sixth gate 8 are respectively arranged at two ends of the water delivery channel A10; the fifth gate 7 is arranged in the middle of the water delivery channel A10.

[0065] Furthermore, a sewage treatment plant pump station outlet water distribution arrangement structure is provided, wherein the number of the water pump outlet troughs 9 is an even number of 2 or more.

[0066] Furthermore, in a water distribution arrangement structure of a sewage treatment plant pump station, ladders 18 are also provided in the water delivery channel B11 and the water delivery channel A10.

[0067] Furthermore, a water distribution arrangement structure of a sewage treatment plant pump station is provided, wherein the bottom of the water pump outlet tank 9 is connected to a sewage lifting and conveying pipe 20 ; the other end of the sewage lifting and conveying pipe 20 is connected to a water pump 16 .

[0068] Furthermore, a water distribution arrangement structure of a sewage treatment plant pump station is provided, wherein a valve 19 is provided at the position where the bottom of the water pump outlet trough 9 is connected to the sewage lifting and conveying pipe 20 .

[0069] In this embodiment, a total of 10 water pumps are configured in the sewage lifting pump room, 8 in use and 2 in reserve. Each water pump is equipped with an independent water outlet trough with a size of B×L×H=2.0m×1.8m×2.12m. It has double-sided water outlet, a single water outlet weir mouth of 2m, and double-sided water outlet, that is, the corresponding weir length is 4m. Compared with traditional single-sided water outlet, the water head on the weir is reduced by 0.24m, which can save 183,000 kWh of electricity per year.

[0070] The length of a single weir is relatively short (2m), and weir plates are used for water distribution, which enhances the uniformity of water distribution. As can be seen from the attached figure, if a single pump is stopped, it will not affect the hydraulic conditions of the fine screen and the grit chamber, which is conducive to the pretreatment function of the fine screen, thereby ensuring the safety of the subsequent biochemical system.

[0071] In the design, 6 channel gates with the size of B×H=1600mm×2600mm are taken into consideration, which are located in the middle and both ends of the water supply channel. They can variably control the water distribution function and make it uniform, and can also better adapt to the flow adjustment in case of accidents, thus improving the safety of the system.

[0072] At both ends of the water delivery channel, the channel is used rationally, and 4 overflow weirs and water pump commissioning gates are set up. The water from each overflow weir and commissioning gate is combined into a DN1200 pipe, which returns to the water inlet of the pump station at the shortest distance, saving the length of the pipeline (compared with a large sewage plant in Chengdu, it saves 268m of stainless steel pipes with a diameter of DN800, and also further reduces the pump head and saves operating costs), combining the overflow and pump station commissioning functions. There are 4 overflow weirs, and the length of a single weir is 4.7m. The corresponding water pump commissioning is equipped with 4 sets of 800x800 gates. While solving the water pump commissioning function, the gate also takes into account the function of increasing the overflow discharge volume in the event of an accident, ensuring that the entire system is safer and more reliable. Two sets of liquid level gauges are set on the overflow weir to control the operation of the water pump and ensure the safety of the system.

[0073] Two water delivery channels B×H=1.6×3.3m respectively connect two groups of fine screens and grit chamber treatment structures on the north and south sides. The above structural form can well meet the functions of water pump discharge and water distribution. Especially in the design of pump stations in large sewage treatment plants, water distribution uniformity is crucial to the treatment effect and safe operation of sewage treatment plants.

[0074] A method for distributing effluent from a sewage treatment plant pump station comprises the following steps:

[0075] S1: The sewage treated by the coarse screen is lifted by the water pump 16 and enters the water pump outlet tank 9 through the sewage lifting and conveying pipe 20;

[0076] S2: The sewage in the water tank 9 is pumped out and flows into the water delivery channel A10 and the water delivery channel B10 through the water delivery weir 13;

[0077] S3: By controlling the gates set in the water channel A10 and the water channel B10, the direction of the sewage flow is controlled, flowing into the first branch 1 of the water channel or the second branch 5 of the water channel or into the first branch 1 of the water channel and the second branch of the water channel at the same time), and the water is distributed to the subsequent fine screen treatment structure.

[0078] The sewage entering the sewage treatment plant is lifted by the sewage pump station to the pump outlet trough, and is evenly distributed to the water supply channel by the outlet weirs of equal length on both sides of the outlet trough. The gates of the water supply channel are used to control the water supply channel to distribute water upward and downward to the subsequent fine screen treatment structure.

[0079] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A water distribution arrangement structure for a sewage treatment plant pump station, characterized in that: It includes a water pump outlet trough group (12), a water delivery channel, an overflow weir A (14), an overflow weir B (15), and a water outlet weir (13); The water pump outlet trough group (12) comprises two or more water pump outlet troughs (9); water outlet weirs (13) are respectively provided on both sides of the water pump outlet trough (9); the two or more water pump outlet troughs (9) are arranged in a row; The water channel comprises a first branch of the water channel (1), a water channel B (11), a second branch of the water channel (5), and a water channel A (10); The water delivery channel B (11) and the water delivery channel A (10) are respectively arranged on both sides of the water pump outlet trough group (12); The overflow weir A (14) and the overflow weir B (15) are arranged at both ends of the water pump outlet trough group (12); the overflow weir A (14) is connected to the second branch of the water delivery channel (5); the overflow weir B (15) is connected to the first branch of the water delivery channel (1); The water delivery channel B (11) and the water delivery channel A (10) form a connected water circulation passage through the overflow weir A (14) and the overflow weir B (15).

2. A sewage treatment plant pump station outlet water distribution arrangement structure according to claim 1, characterized in that: Also includes gates; The gates include a first gate (2), a second gate (3), a third gate (4), a fourth gate (6), a fifth gate (7), and a sixth gate (8); The first gate (2) and the third gate (4) are respectively arranged at two ends of the water delivery channel B (11); the second gate (3) is arranged in the middle of the water delivery channel B (11); The fourth gate (6) and the sixth gate (8) are respectively arranged at two ends of the water delivery channel A (10); and the fifth gate (7) is arranged in the middle of the water delivery channel A (10).

3. A sewage treatment plant pump station outlet water distribution arrangement structure according to claim 1 or 2, characterized in that: The number of the water pump outlet troughs (9) is an even number of 2 or more.

4. The water distribution arrangement structure of a sewage treatment plant pump station according to claim 1, characterized in that: A ladder (18) is also provided in the water delivery channel B (11) and the water delivery channel A (10).

5. The water distribution arrangement structure of a sewage treatment plant pump station according to claim 1, characterized in that: The bottom of the water pump outlet trough (9) is connected to a sewage lifting and conveying pipe (20); the other end of the sewage lifting and conveying pipe (20) is connected to a water pump (16).

6. The water distribution arrangement structure of a sewage treatment plant pump station according to claim 1, characterized in that: A valve (19) is provided at the bottom of the water pump outlet trough (9) at a position connected to the sewage lifting and conveying pipe (20).

7. A method for distributing water from a sewage treatment plant pump station according to any one of claims 1 to 6, characterized in that: The steps include: S1: The sewage treated by the coarse screen is lifted by the water pump (16) and enters the water pump outlet tank (9) through the sewage lifting and conveying pipe (20); S2: The sewage in the water pump outlet tank (9) flows into the water delivery channel A (10) and the water delivery channel B (11) through the water delivery weir (13); S3: By controlling the gates provided in the water channel A (10) and the water channel B (11), the direction of the sewage flow is controlled, and the sewage flows into the first branch of the water channel (1) or the second branch of the water channel (5) or flows into the first branch of the water channel (1) and the second branch of the water channel (5) at the same time, and the water is distributed to the subsequent fine screen treatment structure.

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