Continuous flow self-cleaning sedimentation tank for water treatment

Abstract

The utility model relates to a continuous flow self-cleaning sedimentation tank for water treatment. The continuous flow self-cleaning sedimentation tank comprises a water inlet distribution area and a water treatment area, the water inlet distribution area is adjacent to the water treatment area through a first water retaining piece, and a water passing hole is formed in the upper part of the first water retaining piece, so that water in the water inlet distribution area enters the water treatment area through the water passing hole; wherein the water treatment area is internally provided with a steady flow area, and a sludge area, an inclined pipe area and a clear water area which are positioned on one side of the steady flow area; the sludge area, the inclined pipe area and the clear water area are sequentially arranged from bottom to top, and the steady flow area is separated from the inclined pipe area and the clear water area through a second water retaining piece, so that water from the water inlet and distribution area is discharged from the clear water area after sequentially passing through the steady flow area, the sludge area and the inclined pipe area. Compared with a traditional horizontal flow sedimentation tank and a radial flow type secondary sedimentation tank, the horizontal flow type secondary sedimentation tank has the beneficial effects that the occupied area can be reduced, and the sedimentation treatment water quantity is increased; and continuous and automatic water treatment can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a continuous flow self-cleaning sedimentation tank for water treatment. Background Art

[0002] In water treatment, sedimentation tanks are used to remove impurities and suspended matter from sewage. There are horizontal flow, vertical flow, radial flow, inclined tube and other forms. Among them, water plants with larger treatment scales mainly use horizontal flow sedimentation tanks, which have the advantages of convenient management and stable operation, but there are problems such as large land occupation and difficulty in sludge discharge, which will not be able to meet the intensive development trend in the future; in water plants with limited land, inclined tube sedimentation tanks are also widely used, but after long-term operation, due to the addition of flocculants, the sludge viscosity increases and it is easy to stick to the inclined tube, causing problems such as obstruction and cleaning of the inclined tube, which brings great difficulties to the operation and management of the water plant. On the other hand, the secondary sedimentation tank in sewage treatment is an important unit in sewage treatment. It bears the role of mud and water separation, can remove a large number of insoluble pollutants, and settle phosphorus-rich sludge. Its operation effect will directly affect the effect of the entire sewage treatment and the effluent water quality, so it is very important to ensure its normal and stable operation. Commonly used secondary sedimentation tanks include horizontal flow, vertical flow, radial flow, rectangular, inclined tube and other types. Among them, radial flow secondary sedimentation tanks are widely used in municipal sewage treatment plants due to their good sedimentation performance, simple equipment and stable operation. However, compared with other types of sedimentation tanks, they have disadvantages such as large area and low operating load.

[0003] At present, the problem of large sewage treatment volume and limited land area has gradually become prominent, and the inclined tube sedimentation tank has gradually become a hot topic. According to the "Outdoor Drainage Design Standard" (GB 50014-2021), the surface hydraulic load of the radial flow secondary sedimentation tank can be 0.6~1.5m3 / (m2·h), and the surface hydraulic load of the inclined tube sedimentation tank can be doubled, and it can be built together with the biochemical tank or other treatment structures, which is also conducive to reducing a certain amount of land. At present, there is no complete design standard and technical specification for the inclined tube sedimentation tank in the field of sewage treatment. Designers often rely on the design method of the inclined tube sedimentation tank in water supply treatment. However, due to the large differences in sludge properties and concentrations between water supply and sewage, there are often many problems in actual operation, such as sludge floating and unstable effluent. In addition, due to the large number of inclined tubes, when there is sludge blocking, it is easy to cause anaerobic environment and then cause sludge decay, and even reduce sludge activity, which will greatly inhibit the treatment of the biochemical tank, thereby affecting the operation effect and effluent water quality. Utility Model Content

[0004] The utility model aims at the technical problems existing in the prior art and provides a continuous flow self-cleaning sedimentation tank for water treatment, which performs inclined pipe cleaning in the continuous water inlet process and has the characteristics of stable water output, high processing load, high degree of automation and the like.

[0005] The utility model solves the above technical problems with the following technical solutions: A continuous flow self-cleaning sedimentation tank for water treatment comprises: a water inlet distribution area and a water treatment area; the water inlet distribution area is adjacent to the water treatment area through a first water retaining member, and a water through hole is provided on the upper part of the first water retaining member, so that water in the water inlet distribution area enters the water treatment area through the water through hole;

[0006] The water treatment area is provided with a steady flow area, and a sludge area, an inclined pipe area and a clear water area located on one side of the steady flow area;

[0007] The sludge area, the inclined pipe area and the clean water area are arranged in sequence from bottom to top, and the steady flow area is separated from the inclined pipe area and the clean water area by a second water retaining member, so that water from the water inlet and distribution area passes through the steady flow area, the sludge area and the inclined pipe area in sequence and is discharged from the clean water area.

[0008] As a further technical solution, a plurality of inclined plates are provided at the bottom of the sludge area, and a sludge discharge branch pipe is provided at the bottom between each two adjacent inclined plates, and each sludge discharge branch pipe is connected to a sludge discharge main pipe provided outside the water treatment area;

[0009] Wherein, the mud discharge branch pipe is provided with a plurality of groups of mud discharge holes along its length direction, and each group of mud discharge holes is provided with two mud discharge holes, which are mirror-arranged along the width direction of the mud discharge branch pipe.

[0010] As a further technical solution, the mud discharge hole is arranged to be inclined downward.

[0011] As a further technical solution, the angle formed by the two mud discharge holes in each group of mud discharge holes is 40-50 degrees.

[0012] As a further technical solution, the angle formed by two adjacent inclined plates is an acute angle, and the inclined plates and the bottom end surface of the sludge area form a structure with a triangular longitudinal section.

[0013] As a further technical solution, a plurality of air flushing branch pipes are arranged side by side and at intervals on the upper part of the sludge area, so that the air flushing branch pipes are connected to the air flushing main pipe outside the water treatment area.

[0014] As a further technical solution, the air punching branch pipe is provided with a plurality of groups of air punching holes along its length direction, and each group of the air punching holes is provided with two air punching holes, which are horizontally mirror-arranged along the width direction of the mud discharge branch pipe.

[0015] As a further technical solution, the clean water area is provided with a drainage channel, a drainage weir, a water outlet weir, and an online instrument;

[0016] One end of the drainage channel is connected to the second water retaining member, and the other end is connected to the drainage weir, and the drainage channel is connected to the drainage pipe outside the water treatment area;

[0017] The water outlet weir is arranged on the top surface of the clean water zone, and the online instrument is arranged in the clean water zone and is located between the water outlet weir and the drainage weir in the longitudinal direction.

[0018] As a further technical solution, a water collection channel and a water outlet pipe connected to the water collection channel are also provided in the water treatment area;

[0019] The water outlet weir is connected to the water collection channel, so that water from the water outlet weir is discharged from the water outlet pipe after passing through the water collection channel.

[0020] As a further technical solution, a drainage electric valve is provided on the drainage pipe.

[0021] As a further technical solution, a mud discharge valve is provided on the mud discharge branch pipe.

[0022] The beneficial effects of the utility model are:

[0023] 1. Compared with the traditional horizontal flow sedimentation tank and radial flow secondary sedimentation tank, the structure of the utility model can reduce the land occupation and increase the sedimentation treatment water volume;

[0024] 2. The high-pressure air cleaning in this structure can loosen the sludge attached to the inclined pipe and discharge it in time;

[0025] 3. Through the use of online detectors, the flushing mode can be automatically turned on when the turbidity or suspended solids concentration in the clear water area of ​​the water treatment area is higher than the set value;

[0026] 4. It can achieve continuous and automatic water treatment, which is convenient, applicable and saves labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the planar structure of the utility model;

[0028] Figure 2 This is a schematic diagram of the longitudinal structure of the utility model;

[0029] The arrows in each figure indicate the direction of water flow or gas movement.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] Inlet distribution area 1;

[0032] Water treatment area 2, steady flow area 21, sludge area 22, inclined plate 221, sludge discharge branch pipe 222, sludge discharge main pipe 223, air flushing branch pipe 224, air flushing main pipe 225, air flushing manual valve 226, air flushing electric valve 227, sludge discharge valve 228; inclined pipe area 23, inclined pipe 231, clear water area 24, drainage channel 241, drainage weir 242, water outlet weir 243, online instrument 244;

[0033] A first water retaining member 3 and a water hole 31;

[0034] A second water retaining member 4;

[0035] Drain pipe 5, drain electric valve 51;

[0036] Water collection channel 6, water outlet pipe 7. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0038] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0039] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. In order to enable any technician in the field to implement and use the utility model, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the utility model obscure. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0040] To solve the problems of land occupation and low operating load, see Figure 1 , Figure 2The present embodiment provides a continuous flow self-cleaning sedimentation tank for water treatment, comprising a water inlet distribution area 1 and a water treatment area 2; the water inlet distribution area 1 is adjacent to the water treatment area 2 through a first water retaining member 3, and a water through hole 31 is provided on the upper part of the first water retaining member 3, so that the water in the water inlet distribution area 1 enters the water treatment area 2 through the water through hole 31; the water treatment area 2 can perform air flushing cleaning, scum removal and other operations on the water; wherein, the water treatment area 2 is provided with The steady flow area 21, and the sludge area 22, the inclined pipe area 23 and the clean water area 24 located on one side of the steady flow area 21; the sludge area 22, the inclined pipe area 23 and the clean water area 24 are arranged sequentially from bottom to top, and the steady flow area 21 is separated from the inclined pipe area 23 and the clean water area 24 by the second water retaining member 4, so that the water from the water inlet and water distribution area 1 is discharged from the clean water area 24 after passing through the steady flow area 21, the sludge area 22 and the inclined pipe area 23 in sequence. The operation of air flushing cleaning and scum discharge is completed by the synergistic action of the sludge area 22, the inclined pipe area 23 and the clean water area 24. A plurality of inclined pipes 231 arranged at intervals and inclined are arranged in the inclined pipe area 23, and further, the inclined pipe 231 is arranged at an inclination of 60 degrees.

[0041] The first water retaining member 3 and the second water retaining member 4 can be walls or baffles or other watertight structures used for partitioning.

[0042] In the specific implementation process, a plurality of inclined plates 221 are provided at the bottom of the sludge area 22, and a sludge discharge branch pipe 222 is provided at the bottom between each two adjacent inclined plates 221. Each sludge discharge branch pipe 222 is connected to a sludge discharge main pipe 223 provided outside the water treatment area 2, so that the sludge discharge branch pipe 222 transports the sludge to the sludge discharge main pipe 223 and then discharges it to avoid accumulation in the sludge area 22; wherein, the sludge discharge branch pipe 222 is provided with a plurality of groups of discharge pipes along its length direction. Mud holes (not shown in the figure), and each group of the mud discharge holes is provided with two, and are mirrored along the width direction of the mud discharge branch pipe 222. In order to better allow the sludge to fall into the mud discharge holes without clogging, the mud discharge holes are tilted downward; further, the angle formed by the two mud discharge holes in each group of the mud discharge holes is 40-50 degrees, preferably, the angle formed by the two mud discharge holes in each group of the mud discharge holes is 45 degrees, and the angle here is the angle formed by the axis of the mud discharge holes extending upward and then intersecting.

[0043] In more detail, the angle formed by two adjacent inclined plates 221 is an acute angle, and the longitudinal section thereof with the bottom end surface of the sludge area 22 forms a triangular structure, so that the sludge moves downward evenly under the action of the inclined plates 221 and finally falls into the sludge discharge hole and is discharged in sequence through the sludge discharge branch pipe 222 and the sludge discharge main pipe 223, thereby avoiding large-scale sludge deposition in one place in the sludge area 22. In order to effectively control the sludge discharge time, a sludge discharge valve 228 is provided on the sludge discharge branch pipe 222.

[0044] In the specific implementation process, a plurality of air-flushing branch pipes 224 are arranged side by side at intervals on the upper part of the sludge area 22, so that the air-flushing branch pipes 224 are connected to the air-flushing main pipe 225 outside the water treatment area 2, and the air-flushing branch pipes 224 are provided with double-sided horizontal air-flushing holes to prevent sludge from clogging the air-flushing holes; an air-flushing manual valve 226 is provided on the pipe section of the air-flushing branch pipe 224 extending out of the water treatment area 2 to control the opening of the air-flushing branch pipe 224, and an air-flushing electric valve 227 is provided on the air-flushing main pipe 225; further, the air-flushing branch pipe 224 is arranged between the inclined plate 221 and the inclined pipe area 23.

[0045] In the specific implementation process, the clean water area 24 is provided with a drainage channel 241, a drainage weir 242, a water outlet weir 243, and an online instrument 244; one end of the drainage channel 241 is connected to the second water retaining member 4, and the other end is connected to the drainage weir 242, and the drainage channel 241 is connected to the drainage pipe 5 outside the water treatment area 2; the water outlet weir 243 is arranged at the top surface of the clean water area 24, and the online instrument 244 is arranged in the clean water area 24 and is located between the water outlet weir 243 and the drainage weir 242 in the longitudinal direction, and the water quality of the outlet water in the water treatment area 2 is monitored in real time by the online instrument 244; more specifically, the online instrument 244 is connected to the air-blast electric valve 227 and the drainage electric valve 51 by electrical signals to automatically switch between the normal sedimentation operation mode and the backwashing mode, and the degree of automation is high;

[0046] Preferably, the online instrument 244 is an online SS detector or an online turbidity meter, and when the online instrument 244 uses an online turbidity meter for water treatment, and an online SS detector for sewage treatment; further, the online instrument 244 is linked with the drain electric valve 51, and when the value of the online instrument 244 is higher than the limit value (usually SS>8mg / L, turbidity>2NTU), the drain electric valve 51 will remain open to prevent excessive water from entering the next treatment unit. Furthermore, the top surface of the drainage weir 242 is lower than the top surface of the outlet weir 243, and its height difference design should meet the requirement that the liquid level is lower than the bottom of the outlet weir 243 during air flushing cleaning, so as to prevent muddy water from entering the outlet weir 243 or scum from sticking to the wall of the outlet weir 243, resulting in the recovery of water production and entering the subsequent treatment unit.

[0047] In more detail, a water collection channel 6 and an outlet pipe 7 connected to the water collection channel 6 are also provided in the water treatment area 2; the outlet weir 243 is connected to the water collection channel 6, so that water from the outlet weir 243 passes through the water collection channel 6 and is discharged from the outlet pipe 7, and a drainage electric valve 51 is provided on the drain pipe 5 to control the opening of the drain pipe 5.

[0048] In the above embodiment, the sedimentation tank can be functionally divided into a sedimentation system, a mud discharge system, a self-cleaning system, and a drainage system;

[0049] in,

[0050] The sedimentation system includes a water inlet, a steady flow area 21, a mud settling area, an inclined pipe area 23, a clear water area 24, a water outlet weir 243, a water collection channel 6, and a water outlet pipe 7;

[0051] The mud discharge system includes a mud area 22, a perforated mud discharge pipe, a mud discharge valve, and a mud discharge pipe;

[0052] The self-cleaning system includes an air-flushing branch pipe 224, an air-flushing main pipe 225, an air-flushing manual valve 226, and an air-flushing electric valve 227;

[0053] The drainage system includes a drainage weir 242, a drainage channel 241, a drainage electric valve 51, a drainage pipe 5, and an online instrument 244;

[0054] The utility model is achieved in this way:

[0055] Its operation process is: sedimentation and water production → air flushing cleaning → scum discharge → sedimentation and water production

[0056] If a certain amount of scum is present on the upper part of the sedimentation tank due to operational problems, the scum discharge mode may be opened separately, that is, the drain electric valve 51 is directly opened and closed after 5 to 10 minutes.

[0057] Operation mode 1: Sedimentation and water production mode

[0058] After the previous stage of scum discharge mode is completed, when the value of the online instrument 244 is lower than the limit value (usually SS < 8 mg / L, turbidity < 2 NTU), the drainage electric valve 51 is automatically closed, and water production begins after the water level rises to the outlet weir 243. In this mode, the inlet water enters the steady flow area 21 through the water inlet hole from the water inlet distribution area 1. When passing through the inclined pipe area 23, the sludge is intercepted and slides into the sludge area 22 for sedimentation and enrichment. After entering the clear water area 24, it enters the water collection channel 6 through the outlet weir 243, and enters the next stage of treatment unit through the outlet pipe 7. The precipitated and enriched sludge enters the sludge well through the perforated sludge discharge pipe and the sludge discharge pipe, and flows back to the biochemical pool or removes the remaining sludge (wastewater treatment).

[0059] Operation mode 2: Air flushing cleaning mode

[0060] When the value of the online instrument 244 is higher than the limit value (usually SS>8mg / L, turbidity>2NTU) or reaches the set time (usually 5 to 7 days), the drainage electric valve 51 automatically opens, and the liquid level in the sedimentation tank drops accordingly. When it is lower than the outlet weir 243, water production stops. Subsequently, the air blower and the air blower electric valve 227 automatically open, and high-pressure air blow cleaning begins. The sludge attached to the inclined tube is flushed and discharged into the sewage or sludge system with the outlet water through the drainage weir 242, the drainage channel 241 and the drainage pipe 5. Usually the air blow cleaning lasts for 5 to 10 minutes, and the air blower (not shown in the figure) and the air blower electric valve 227 are automatically closed. During this cleaning process, the loose muddy water is discharged through the drainage pipe 5, so that the cleaning is carried out without stopping the water;

[0061] Operation mode 3: scum removal mode

[0062] After the air flushing cleaning mode, the scum discharge mode is entered, that is, as the water flow in the sedimentation tank gradually stabilizes, the sludge settles again, and the scum on the top is discharged from the sedimentation tank through the drainage system with the water flow. When the value of the online instrument 244 is lower than the limit value (usually SS <8mg / L, turbidity <2NTU), the drainage electric valve 51 is automatically closed, the water level rises to the outlet weir 243, and the sedimentation water production mode is restored.

[0063] During the implementation of the upper embodiment, an air-water backwashing method is adopted, which can reduce the clogging of the inclined tube compared with the traditional co-pipe sedimentation tank; raw water is used as the backwashing water, and there is no need to consume clean water; a higher surface load is adopted, which can reduce the space occupied and increase the amount of water for sedimentation treatment; and a high-pressure air cleaning method is used to wash and loosen the sludge on the surface of the inclined tube; and after the flushing is completed, under the control of the drain valve, time is provided for the sedimentation of the upper muddy water to ensure that the effluent SS meets the standard before discharge; and in order to be built together with the biochemical pool to save space, the sedimentation tank is designed to be rectangular, and the structure is automated, and no personnel are required to be on duty.

[0064] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0065] Although the preferred embodiments of the utility model have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations 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 continuous flow self-cleaning sedimentation tank for water treatment, characterized in that: It comprises a water inlet and distribution area (1) and a water treatment area (2); the water inlet and distribution area (1) is adjacent to the water treatment area (2) via a first water retaining member (3), and a water through hole (31) is provided on the upper part of the first water retaining member (3), so that water in the water inlet and distribution area (1) enters the water treatment area (2) through the water through hole (31); The water treatment area (2) is provided with a steady flow area (21), and a sludge area (22), an inclined pipe area (23) and a clear water area (24) located on one side of the steady flow area (21); The sludge area (22), the inclined tube area (23) and the clean water area (24) are arranged in sequence from bottom to top, and the steady flow area (21) is separated from the inclined tube area (23) and the clean water area (24) by a second water retaining member (4), so that water from the water inlet and water distribution area (1) passes through the steady flow area (21), the sludge area (22) and the inclined tube area (23) in sequence and is then discharged from the clean water area (24).

2. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 1, characterized in that: A plurality of inclined plates (221) are provided at the bottom of the sludge area (22), and a sludge discharge branch pipe (222) is provided at the bottom between each two adjacent inclined plates (221), and each sludge discharge branch pipe (222) is connected to a sludge discharge main pipe (223) provided outside the water treatment area (2); The mud discharge branch pipe (222) is provided with a plurality of groups of mud discharge holes along its length direction, and each group of mud discharge holes is provided with two mud discharge holes, which are arranged in a mirror-like manner along the width direction of the mud discharge branch pipe (222).

3. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 2, characterized in that: The mud discharge hole is arranged to be inclined downward.

4. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 3, characterized in that: The angle formed by the two mud discharge holes in each group of mud discharge holes is 40-50 degrees.

5. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 2, characterized in that: The angle formed by two adjacent inclined plates (221) is an acute angle, and together with the bottom end surface of the sludge area (22), they form a structure with a triangular longitudinal section.

6. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 2, characterized in that: A plurality of air flushing branch pipes (224) are arranged side by side and spaced apart on the upper part of the sludge area (22), so that the air flushing branch pipes (224) are connected to the air flushing main pipe (225) outside the water treatment area (2); The air punching branch pipe (224) is provided with a plurality of groups of air punching holes along its length direction, and each group of air punching holes is provided with two air punching holes, which are arranged in a horizontal mirror image along the width direction of the mud discharge branch pipe (222).

7. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 1, characterized in that: The clean water area (24) is provided with a drainage channel (241), a drainage weir (242), a water outlet weir (243), and an online instrument (244); One end of the drainage channel (241) is connected to the second water retaining member (4), and the other end is connected to the drainage weir (242), and the drainage channel (241) is in communication with a drainage pipe (5) outside the water treatment area (2); The water outlet weir (243) is arranged on the top end surface of the clean water area (24), and the online instrument (244) is arranged in the clean water area (24) and is located between the water outlet weir (243) and the drainage weir (242) in the longitudinal direction.

8. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 7, characterized in that: The water treatment area (2) is also provided with a water collection channel (6) and a water outlet pipe (7) connected to the water collection channel (6); The water outlet weir (243) is in communication with the water collection channel (6), so that water from the water outlet weir (243) passes through the water collection channel (6) and is then discharged from the water outlet pipe (7).

9. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 7, characterized in that: The drainage pipe (5) is provided with a drainage electric valve (51).

10. A continuous flow self-cleaning sedimentation tank for water treatment according to claim 2, characterized in that: The mud discharge branch pipe (222) is provided with a mud discharge valve (228).

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