Vertical flow sedimentation tank suitable for rural sewage IFAS treatment process

Abstract

The invention discloses a secondary sedimentation tank suitable for a rural sewage IFAS treatment process, the secondary sedimentation tank mainly comprises a biochemical sedimentation area and a physicochemical sedimentation area, the biochemical sedimentation area is composed of a middle bin and two side lug chambers, and is mainly used for mud-water separation of a biochemical tank and reduction of solid load of physicochemical sedimentation; the physicochemical settling zone comprises a coagulation zone and an inclined tube settling zone and is mainly used for chemically removing phosphorus and further removing suspended matters. A cylindrical interception screen, a pull plate valve and a purging air pipe are arranged at the water inlet end of the biochemical precipitation area, a biochemical residual sludge pump, a biochemical reflux pump and an intermediate water pump are arranged in the intermediate bin, and a physicochemical sludge discharge pump, an outer reflux pump, a turning plate and a PAC dosing point are arranged in the physicochemical precipitation area. The secondary sedimentation tank is not complex in structure, can operate flexibly, has a good sedimentation effect, and well meets the requirements of the IFAS treatment process of rural sewage.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a vertical flow sedimentation tank suitable for an IFAS treatment process of rural sewage. Background Art

[0002] With the rapid development of my country's rural economy, the problem of rural domestic sewage treatment has become increasingly prominent. Rural residents are relatively scattered in terms of geographical distribution, making it difficult to collect sewage. In order to reduce pipe network investment and improve sewage collection and treatment rates, integrated sewage treatment equipment with advantages such as high efficiency and intensiveness, easy construction and maintenance is often used. Based on the characteristics of small average volume of rural sewage, large fluctuations in water quality and quantity, and low water temperature in winter, the treatment process of integrated sewage treatment equipment needs to select the pure biofilm MBBR process or IFAS (fixed biofilm-activated sludge) process, but the MBBR process has a high filler filling ratio and high and difficult operation and maintenance requirements. Therefore, most of them use the IFAS process that combines the traditional activated sludge method and the biofilm method.

[0003] At present, the integrated equipment using IFAS process on the market has a biochemical unit and a sedimentation unit coupled together. The operation effect of the sedimentation unit has a crucial impact on the stable operation of the integrated treatment equipment. The common horizontal flow sedimentation tank, inclined tube sedimentation tank and vertical flow sedimentation tank are applied to the integrated rural sewage treatment equipment of the IFAS process. There are certain problems and defects from different angles such as sedimentation effect, floor space and operation and maintenance. The integrated equipment is generally of standard fixed size. The horizontal flow sedimentation tank or the inclined tube sedimentation tank occupies a large area, which compresses the space of the biochemical section and is not conducive to the design of switching of the functional areas of the biochemical section (that is, adding a functional unit to the conventional biochemical section to realize the switching of different processes, such as A 2 O is switched to two-stage AO), and the ratio of aerobic functional area or anoxic functional area of ​​the treatment process cannot be automatically adjusted according to the water quality and water volume of the incoming water, resulting in unstable effluent water quality. Although the existing vertical flow sedimentation tank occupies a small area and can better solve the space limitation problem of integrated sewage treatment equipment, the basic guidance requirements of the vertical flow sedimentation tank design cannot be met vertically because the height of the integrated equipment itself is generally less than 3 meters. The mud and water separation effect of the sewage is poor, resulting in its less application in integrated sewage treatment equipment.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The present invention provides a sedimentation tank suitable for integrated rural sewage treatment equipment adopting the IFAS process. The sedimentation tank can be connected after the biochemical section as a biochemical sludge sedimentation unit. Under the condition that the height of the integrated treatment equipment is limited, a flow state suitable for mud and water separation is achieved through structural design, and the reduced floor space of the sedimentation tank is used for the biochemical section, thereby improving the flexibility and novelty of the process operation of the biochemical section. At the same time, an interception device is arranged at the water inlet end to prevent the filler from clogging the water passage, and the goals of non-stop water replacement and simple maintenance can be achieved. On the basis of being adapted to the operation requirements of the IFAS process, the sedimentation tank has the advantages of good sedimentation effect, small floor space, easy operation and maintenance, and the like.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage, comprising:

[0008] A transverse partition is arranged in the sedimentation tank body, and the transverse partition divides the sedimentation tank body from front to back into a physicochemical sedimentation area and a biochemical sedimentation area;

[0009] Two longitudinal partitions are arranged in the biochemical precipitation area, and the biochemical precipitation area is transversely divided into a middle chamber and a first ear chamber and a second ear chamber on both sides of the middle chamber by the two longitudinal partitions, and the first ear chamber and the second ear chamber are connected with the middle chamber through the bottom of the longitudinal partition;

[0010] The physicochemical sedimentation zone is provided with a coagulation zone and an inclined tube sedimentation zone in sequence from front to back;

[0011] The first ear chamber and the second ear chamber are respectively provided with ear chamber water collecting pipes, which are connected to the coagulation area through the ear chamber water collecting pipes;

[0012] The first ear chamber and the second ear chamber are respectively provided with vertical flow water distribution pipes, the water inlet ends of the two vertical flow water distribution pipes are connected to the biochemical pool, the two vertical flow water distribution pipes are provided with pull plate valves, the water inlet ends of the two vertical flow water distribution pipes are provided with cylindrical interception screens, and the two cylindrical interception screens are provided with purge air pipes;

[0013] A biochemical excess sludge pump, a biochemical reflux pump and an intermediate water pump are respectively arranged in the intermediate bin of the biochemical precipitation zone, the excess sludge pump is connected to the external sludge storage tank via a first sludge discharge pipe, the biochemical reflux pump is connected to the water inlet end of the biochemical tank via an internal reflux pipe, and the intermediate water pump is connected to the coagulation zone in the physical and chemical precipitation zone via a water outlet pipe;

[0014] A physicochemical sludge pump, an external return pump and a flap are respectively arranged in the coagulation zone in the physicochemical sedimentation zone. The physicochemical sludge pump is connected to the external sludge storage tank via a second sludge discharge pipe, and the external return pump is connected to the anaerobic tank via an external return pipe; the flap can be mixed and stirred in a pulse manner; a PAC dosing point is arranged on the side wall of the coagulation zone;

[0015] A middle water inlet is arranged at the front middle part of the inclined tube sedimentation zone, which is connected to the coagulation zone through the middle water inlet; a clean water collection pipe is arranged above the inclined tube at the rear middle part of the inclined tube sedimentation zone, and a mud bucket is arranged at the bottom below the inclined tube.

[0016] Compared with the prior art, the vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage provided by the present invention has the following beneficial effects:

[0017] By setting a transverse partition in the sedimentation tank body, the sedimentation tank body is divided into a biochemical sedimentation area and a physicochemical sedimentation area. The biochemical sedimentation area is divided into an intermediate bin and the first ear chamber and the second ear chamber on both sides by two longitudinal partitions set at intervals. The biochemical sedimentation area of ​​this structure is mainly used for mud and water separation in the biochemical tank to reduce the solid load of the physicochemical sedimentation; the physicochemical sedimentation area is set with a coagulation area and an inclined tube sedimentation area, which are mainly used for chemical phosphorus removal and further removal of suspended matter. A cylindrical interception screen, a pull plate valve and a purge air pipe are set at the water inlet end of the biochemical sedimentation area, which can facilitate maintenance, interception of fillers and suspended matter such as hair fibers and filler fluidization in the mud and water mixture, and avoid the accumulation of fillers at the screen to affect water flow; the intermediate bin is equipped with a biochemical residual sludge pump, a biochemical reflux pump and an intermediate water pump, which can realize the alternating precipitation and water discharge of the intermediate bin and the ear chamber by controlling the start and stop of the intermediate water pump; the physicochemical sedimentation area is equipped with a physicochemical sludge pump, an external reflux pump, a flap and a PAC dosing point, which can improve the effect of inclined tube sedimentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the overall structure of a vertical flow sedimentation tank suitable for the IFAS treatment process for rural sewage provided in an embodiment of the present invention.

[0020] Figure 2 A schematic structural diagram of the biochemical sedimentation zone of a vertical flow sedimentation tank suitable for the IFAS treatment process for rural sewage provided in an embodiment of the present invention.

[0021] Figure 3 A schematic diagram of the front structure of the biochemical sedimentation zone of a vertical flow sedimentation tank suitable for the IFAS treatment process for rural sewage provided in an embodiment of the present invention.

[0022] Figure 4 A schematic structural diagram of a cylindrical intercepting screen suitable for the IFAS treatment process for rural sewage provided in an embodiment of the present invention.

[0023] Figure 5 A schematic diagram of the bottom structure of the physicochemical sedimentation zone of a vertical flow sedimentation tank suitable for the IFAS treatment process for rural sewage provided in an embodiment of the present invention.

[0024] Figure 6 A schematic diagram of alternating sedimentation and water discharge from the intermediate bin in the biochemical sedimentation zone of the vertical flow sedimentation tank provided in an embodiment of the present invention; wherein (a) is a schematic diagram of static sedimentation in the intermediate bin with the ear chamber sedimentation discharged by stopping the pump; and (b) is a schematic diagram of sedimentation and water discharge from the intermediate bin with the ear chamber sedimentation discharged by starting the pump.

[0025] The marks in the figure are: 1-water inlet screen; 2-pull plate valve; 3-purge air pipe; 4-end cover; 5-vertical flow water distribution pipe; 6-ear chamber water collection pipe; 7-biochemical residual sludge pump; 8-biochemical return pump; 9-intermediate water pump; 10-physical and chemical sludge pump; 11-external return pump; 12-flap; 13-PAC dosing point; 14-inclined pipe; 15-middle water inlet; 16-collecting pipe; 17-mud hopper; 18-transverse partition; 19-longitudinal partition; 100-sedimentation tank body; 200-biochemical sedimentation area; 201-first ear chamber; 202-second ear chamber; 203-intermediate bin; 300-physical and chemical sedimentation area; 301-coagulation area; 302-inclined pipe sedimentation area. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the specific content of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0027] First, the terms that may be used in this article are explained as follows:

[0028] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0029] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0030] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0031] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0032] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0033] The scheme provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If the specific conditions are not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers are not specified in the reagents or instruments used in the embodiments of the present invention, they are all conventional products that can be purchased commercially.

[0034] like Figures 1 to 5 As shown, the embodiment of the present invention provides a vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage, comprising:

[0035] A transverse partition 18 is provided in the sedimentation tank body 100, and the transverse partition 18 divides the sedimentation tank body 100 from front to back into a physical and chemical sedimentation area 200 and a biochemical sedimentation area 300;

[0036] Two longitudinal partitions are arranged in the biochemical precipitation area 200, and the biochemical precipitation area 200 is transversely divided into a middle chamber and a first ear chamber and a second ear chamber on both sides of the middle chamber by the two longitudinal partitions. The first ear chamber and the second ear chamber are connected with the middle chamber through the bottom of the longitudinal partition;

[0037] The physicochemical sedimentation zone 300 is provided with a coagulation zone and an inclined tube sedimentation zone in sequence from front to back;

[0038] The first ear chamber and the second ear chamber are respectively provided with ear chamber water collecting pipes 6, which are connected to the coagulation area through the ear chamber water collecting pipes 6;

[0039] The first ear chamber and the second ear chamber are respectively provided with vertical flow water distribution pipes 5, the water inlet ends of the two vertical flow water distribution pipes 5 are connected to the biochemical pool, the two vertical flow water distribution pipes 5 are provided with pull plate valves 2, the water inlet ends of the two vertical flow water distribution pipes 5 are provided with cylindrical interception screens 1, and the two cylindrical interception screens 1 are provided with purge air pipes 3;

[0040] A biochemical excess sludge pump 7, a biochemical return pump 8 and an intermediate water pump 9 are respectively arranged in the intermediate bin of the biochemical precipitation zone 200. The excess sludge pump 7 is connected to the external sludge storage tank via a first sludge discharge pipe, the biochemical return pump 8 is connected to the water inlet end of the biochemical tank via an internal return pipe, and the intermediate water pump 9 is connected to the coagulation zone in the physical and chemical precipitation zone 300 via a water outlet pipe.

[0041] A physicochemical sludge pump 10, an external return pump 11 and a flap 12 are respectively arranged in the coagulation zone in the physicochemical sedimentation zone 300. The physicochemical sludge pump 10 is connected to the external sludge storage tank via a second sludge discharge pipe, and the external return pump 11 is connected to the anaerobic tank via an external return pipe; the flap 12 can be mixed and stirred in a pulse manner; a PAC dosing point 13 is arranged on the side wall of the coagulation zone;

[0042] A middle water inlet is arranged at the middle part of the front end of the inclined tube sedimentation zone, which is connected to the coagulation zone 201 through the middle water inlet. A clean water collection pipe 16 is arranged above the inclined tube 14 at the middle part of the rear end of the inclined tube sedimentation zone 202, and a mud bucket 17 is arranged at the bottom below the inclined tube 14.

[0043] See also Figure 4Preferably, in the above-mentioned vertical flow sedimentation tank, the two cylindrical intercepting screens 1 have the same structure, and are both composed of a PVC breathable cap 11, a first straight pipe 12, a first pipe section 13, a second straight pipe 14, a second pipe section 15 and an external threaded joint 16, wherein the PVC breathable cap 11, the first straight pipe 12, the first pipe section 13, the second straight pipe 14, the second pipe section 15 and the external threaded joint 16 are connected in sequence from top to bottom, the PVC breathable cap 11 is inserted and connected to the upper end of the first straight pipe 13, and is connected to the upper end of the first pipe section 12 through the first straight pipe 13, the lower end of the first pipe section 12 is bonded and fixed to the second straight pipe 14 by glue, the lower end of the second straight pipe 14 is bonded and fixed to the upper end of the second pipe section 15 by glue, the lower end of the second pipe section 15 is bonded and fixed to the external threaded joint 16 by glue, and the external threaded joint 16 can be connected to the internal threaded joint at the top of the vertical flow water distribution pipe 5.

[0044] Preferably, in the cylindrical intercepting screen 1, the first pipe section 13 and the second pipe section 15 are both made of DN110 UPVC patterned pipes with a length of 300-400 mm;

[0045] The first pipe section 13 and the second pipe section 13 have a plurality of circular holes or a plurality of rectangular holes formed in their bodies.

[0046] Preferably, in the cylindrical intercepting screen 1, the diameter of the circular holes is 5 to 10 mm, and the spacing is 5 to 10 mm;

[0047] The size of the rectangular hole is width B×length L=3×180-200 mm, and the hole spacing is 5-10 mm.

[0048] Preferably, in the vertical flow sedimentation tank, the inclined tube 14 of the inclined tube sedimentation zone 202 is a honeycomb inclined tube.

[0049] Preferably, in the above-mentioned vertical flow sedimentation tank, the bottom of the sedimentation tank body 100 is an arc-shaped structure.

[0050] Preferably, in the vertical flow sedimentation tank, the rear ends of the two longitudinal partitions are fixedly connected to the transverse partition 18 and are perpendicular to the transverse partition 18;

[0051] The bottoms of the two longitudinal partitions are spaced apart from the bottom of the sedimentation tank body 100 .

[0052] Preferably, the vertical flow sedimentation tank further comprises: a control device electrically connected to the intermediate water pump 9 in the intermediate bin, capable of controlling the start and stop of the intermediate water pump 9 according to a preset duration. By timing the intermediate water pump through the control device, the vertical flow sedimentation tank can automatically perform alternating sedimentation in the intermediate bin and the two side chambers.

[0053] In summary, it can be seen that the vertical flow sedimentation tank of the embodiment of the present invention is divided into a biochemical sedimentation zone and a physicochemical sedimentation zone by arranging a transverse partition in the sedimentation tank body. The biochemical sedimentation zone is divided into an intermediate bin and the first and second ear chambers on both sides by two longitudinal partitions arranged at intervals. The biochemical sedimentation zone of this structure is mainly used for mud and water separation in the biochemical pool to reduce the solid load of the physicochemical sedimentation; a coagulation zone and an inclined tube sedimentation zone are arranged in the physicochemical sedimentation zone, which are mainly used for chemical phosphorus removal and further removal of suspended matter. A cylindrical interception screen, a pull valve and a purge air pipe are set at the water inlet end of the biochemical sedimentation area, which can facilitate maintenance and interception of fillers and suspended matter such as hair fibers in the mud-water mixture as well as filler fluidization, to avoid filler accumulation at the screen and affect water flow; the intermediate bin is equipped with a biochemical residual sludge pump, a biochemical reflux pump and an intermediate water pump, which can realize alternating sedimentation and water discharge from the intermediate bin and the ear chamber by controlling the start and stop of the intermediate water pump; the physicochemical sedimentation area is equipped with a physicochemical sludge pump, an external reflux pump, a flap and a PAC dosing point, which can improve the inclined tube sedimentation effect.

[0054] Under the premise of ensuring the space for the process design of the biochemical section of the integrated sewage treatment equipment and the flexibility of the operation process, the present invention solves the problem of low mud-water separation efficiency caused by height limitation through the optimization of the sedimentation tank structure design and the innovation of the operation control method. The interception screen at the water inlet end of the vertical flow sedimentation tank is structurally innovated to overcome the difficulty of replacing and cleaning the traditional water inlet screen, and the water inlet screen can be replaced and cleaned without stopping the water, which is easy to replace and maintain as a whole.

[0055] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiment of the present invention is described in detail with specific embodiments below.

[0056] Example 1

[0057] like Figures 1 to 5As shown, the embodiment of the present invention provides a vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage. On the basis of improving the mud-water separation effect, the reduced area of ​​the sedimentation tank is used for the biochemical section, thereby improving the flexibility of the biochemical section process operation. The vertical flow sedimentation tank is provided with a transverse partition 18 in the sedimentation tank body 100, and the sedimentation tank body 100 is divided into a biochemical sedimentation area 200 and a physicochemical sedimentation area 300 by the transverse partition 18. The biochemical sedimentation area 200 is divided into an intermediate bin 203 and a first ear chamber 201 and a second ear chamber 202 on both sides by two longitudinal partitions 19 arranged at intervals, which are mainly used for mud-water separation in the biochemical tank and reducing the solid load of the physicochemical sedimentation; the physicochemical sedimentation area 300 includes a coagulation area 301 and an inclined tube sedimentation area 302, which are mainly used for chemical phosphorus removal and further removal of suspended matter. A cylindrical intercepting screen 1, a pull-plate valve 2 and a purge air pipe 3 are arranged at the water inlet end of the biochemical sedimentation zone 200. Specifically, the first ear chamber and the second ear chamber are respectively provided with ear chamber water collecting pipes 6, which are connected to the coagulation zone through the ear chamber water collecting pipes 6; the first ear chamber and the second ear chamber are respectively provided with vertical flow water distribution pipes 5, and the water inlet ends of the two vertical flow water distribution pipes 5 are connected to the biochemical pool; the pull-plate valve 2 is arranged on the two vertical flow water distribution pipes 5, and a cylindrical intercepting screen 1 is arranged on the water inlet ends of the two vertical flow water distribution pipes 5, and a purge air pipe 3 is arranged on the two cylindrical intercepting screens 1. The cylindrical intercepting screen is mainly used to intercept fillers and suspended matter such as hair fibers in the mud-water mixture, and the end cover 4 can be opened to use a brush to clean the fibers on the grid; the plug-plate valve 2 is mainly used for water shutdown and maintenance of the vertical flow sedimentation tank, and the purge air pipe 3 is mainly used for filler fluidization to avoid fillers from accumulating at the screen and affecting water flow. After the sludge-water mixture in the biochemical pool passes through the water screen to intercept the suspended filler, the sludge and water flow into the vertical water distribution pipes 5 of the first ear chamber 201 and the second ear chamber 202 on both sides for sludge-water separation. The precipitated supernatant enters the coagulation zone 301 through the ear chamber water collection pipes 6 on the pool surface of the first ear chamber 201 and the second ear chamber 202 on both sides for flocculation and precipitation. The precipitated sludge slides to the intermediate bin by gravity sedimentation for further concentration and precipitation. The intermediate bin 203 is equipped with a biochemical excess sludge pump 7, a biochemical reflux pump 8 and an intermediate The intermediate water pump 9 and the biochemical residual sludge pump 7 use air lift to regularly discharge the sludge into the sludge storage tank for sludge dehydration; the biochemical reflux pump 8 returns the sludge in the intermediate bin 203 to the water inlet of the biochemical tank, so that the sludge in the first ear chamber 201 and the second ear chamber 202 can slide smoothly into the intermediate bin for further concentration and precipitation; the intermediate water pump 9 is arranged in the intermediate bin 203, and the start and stop of the intermediate water pump 9 is controlled to realize the alternating precipitation and water discharge of the intermediate bin 203 and the first ear chamber 201 and the second ear chamber 202. The specific structure of the cylindrical intercepting screen 1 is as follows Figure 5As shown: It consists of two sections of DN110 UPVC patterned pipes, the first section and the second section, two sections of DN110 UPVC straight pipes, a DN110 male threaded joint and a DN110 PVC breathable cap. The length of the UPVC patterned pipe is about 300-400mm, with DN110 direct joints at both ends. The pipe body is opened with round holes (aperture 5-10mm, spacing 5-10mm) or rectangular holes (B×L=3×180~200mm, hole spacing 5-10mm) to ensure that the MBBR filler does not enter the sedimentation tank. The breathable cap is inserted and connected to the pipe section 1 through the DN110 straight pipe (L=30mm), ensuring that the MBBR filler does not enter the sedimentation tank due to the increase in water level, and at the same time, it is convenient to open the breathable cap to clean the internal area of ​​the screen. Pipe section 1 and pipe section 2 are glued together through a DN110 straight pipe (L=30mm), and the other end of pipe section 2 is glued together with a DN110 straight pipe (L=30mm) and a DN110 external threaded joint. The DN110 external threaded joint is connected to the DN110 internal threaded joint at the top of the vertical flow water distribution pipe. The two can be connected and disassembled by rotation, which is convenient for subsequent disassembly, replacement and cleaning.

[0058] like Figure 6 As shown, when the intermediate water pump 9 is stopped, the first ear chamber 201 and the second ear chamber 202 on both sides settle out water normally, and the intermediate bin 203 is in a static sedimentation process. When the intermediate water pump 9 is turned on and running, the supernatant in the intermediate bin 203 is discharged to the coagulation zone 301 of the physical and chemical sedimentation zone 300 through the intermediate water pump 9, and the first ear chamber 201 and the second ear chamber 202 are in a static sedimentation process. During this process, the first ear chamber 201 and the second ear chamber 202 do not discharge water, and the precipitated sludge will accelerate to slide to the bottom of the intermediate bin 203. The operation mode of the vertical flow sedimentation tank is as follows Figure 6 By using the operation mode of alternately settling water from the middle chamber 203 and the first ear chamber 201 and the second ear chamber 202, the tank capacity can be fully utilized as a sedimentation area for mud and water separation, so as to reduce the influence of the tank height limit on the sedimentation effect and improve the mud and water separation efficiency. Figure 6 (a) and Figure 6(b) in the coagulation zone 301 of the physicochemical sedimentation zone 300 is provided with a physicochemical sludge pump 10, an external return pump 11, a flap 12 and a PAC dosing point 13. The physicochemical sludge pump 10 uses air lift to regularly discharge the flocculated chemical sludge into the sludge storage tank. The external return pump 11 also uses air lift to regularly return a small amount of physicochemical stage sludge to the anaerobic zone to avoid the sludge loss problem caused by sludge running in the biochemical sedimentation zone 200. The main function of the physicochemical sedimentation area 300 is to chemically remove phosphorus and intercept suspended solids in the biochemical sedimentation stage to ensure clear effluent water. The flap 12 is mixed and stirred in a pulse manner to form alum flowers, which then enter the inclined tube sedimentation area 302 for sedimentation. The inclined tube sedimentation area 302 is provided with an inclined tube 14, and the inclined tube 14 preferably adopts a honeycomb inclined tube. The alum flowers in the coagulation area 301 enter the inclined tube sedimentation area 302 through the middle water inlet 15. After shallow sedimentation in the inclined tube 14, the clean water flows out from the clean water collection pipe 16 above the inclined tube 14, and the sludge slides from the bottom of the inclined tube into the mud hopper 17 below the inclined tube for sedimentation and concentration, and is finally discharged into the sludge storage tank.

[0059] In summary, it can be seen that the vertical flow sedimentation tank of the embodiment of the present invention has a simple structure, can operate flexibly, has a good sedimentation effect, and can well meet the requirements of the rural sewage IFAS treatment process.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A vertical flow sedimentation tank suitable for rural sewage IFAS treatment process, characterized in that: include: A transverse partition (18) is arranged in the sedimentation tank body (100), and the transverse partition (18) divides the sedimentation tank body (100) from front to back into a physicochemical sedimentation area (200) and a biochemical sedimentation area (300); Two longitudinal partitions are arranged in the biochemical precipitation area (200), and the biochemical precipitation area (200) is transversely divided into a middle chamber and a first ear chamber and a second ear chamber on both sides of the middle chamber by the two longitudinal partitions, and the first ear chamber and the second ear chamber are connected to the middle chamber through the bottom of the longitudinal partition; The physicochemical sedimentation zone (300) is provided with a coagulation zone and an inclined tube sedimentation zone in sequence from front to back; The first ear chamber and the second ear chamber are respectively provided with ear chamber water collecting pipes (6), which are connected to the coagulation area through the ear chamber water collecting pipes (6); The first ear chamber and the second ear chamber are respectively provided with vertical flow water distribution pipes (5), the water inlet ends of the two vertical flow water distribution pipes (5) are connected to the biochemical pool, the two vertical flow water distribution pipes (5) are both provided with pull plate valves (2), the water inlet ends of the two vertical flow water distribution pipes (5) are both provided with cylindrical intercepting screens (1), and the two cylindrical intercepting screens (1) are both provided with purge air pipes (3); A biochemical excess sludge pump (7), a biochemical return pump (8) and an intermediate water pump (9) are respectively arranged in the intermediate bin of the biochemical sedimentation zone (200); the excess sludge pump (7) is connected to an external sludge storage tank via a first sludge discharge pipe, the biochemical return pump (8) is connected to the water inlet end of the biochemical tank via an internal return pipe, and the intermediate water pump (9) is connected to the coagulation zone in the physicochemical sedimentation zone (300) via a water outlet pipe; A physicochemical sludge discharge pump (10), an external return pump (11) and a flap (12) are respectively arranged in the coagulation zone in the physicochemical sedimentation zone (300); the physicochemical sludge discharge pump (10) is connected to an external sludge storage tank via a second sludge discharge pipe, and the external return pump (11) is connected to an anaerobic tank via an external return pipe; the flap (12) can be mixed and stirred in a pulse manner; a PAC dosing point (13) is arranged on the side wall of the coagulation zone; A middle water inlet is arranged at the front middle part of the inclined tube sedimentation zone, which is connected to the coagulation zone (201) through the middle water inlet; a clean water collection pipe (16) is arranged above the inclined tube (14) at the rear middle part of the inclined tube sedimentation zone (202); and a mud bucket (17) is arranged at the bottom below the inclined tube (14).

2. The vertical flow sedimentation tank applicable to the IFAS treatment process for rural sewage according to claim 1, characterized in that: The two cylindrical intercepting screens (1) have the same structure, and are both composed of a PVC breathable cap (11), a first straight pipe (12), a first pipe section (13), a second straight pipe (14), a second pipe section (15) and an external threaded joint (16), wherein the PVC breathable cap (11), the first straight pipe (12), the first pipe section (13), the second straight pipe (14), the second pipe section (15) and the external threaded joint (16) are connected in sequence from top to bottom, and the PVC breathable cap (11) is inserted into the first The upper end of the straight pipe (13) is connected to the upper end of the first pipe section (12) through the first straight pipe (13); the lower end of the first pipe section (12) is bonded and fixed to the second straight pipe (14) through glue; the lower end of the second straight pipe (14) is bonded and fixed to the upper end of the second pipe section (15) through glue; the lower end of the second pipe section (15) is bonded and fixed to the external threaded joint (16) through glue; and the external threaded joint (16) can be connected to the internal threaded joint at the top end of the vertical flow water distribution pipe (5).

3. The vertical flow sedimentation tank applicable to the IFAS treatment process for rural sewage according to claim 2, characterized in that: The first pipe section (13) and the second pipe section (15) are both DN110 UPVC patterned pipes with a length of 300 to 400 mm; The first pipe section (13) and the second pipe section (13) have a plurality of circular holes or a plurality of rectangular holes in their pipe bodies.

4. The vertical flow sedimentation tank applicable to the IFAS treatment process for rural sewage according to claim 3, characterized in that: The diameter of the circular holes is 5 to 10 mm, and the spacing is 5 to 10 mm; The size of the rectangular hole is width B×length L=3×180-200 mm, and the hole spacing is 5-10 mm.

5. The vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage according to claim 1, characterized in that: The inclined tube (14) of the inclined tube sedimentation zone (202) is a honeycomb inclined tube.

6. The vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage according to claim 1, characterized in that: The bottom of the sedimentation tank body (100) is an arc-shaped structure.

7. The vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage according to any one of claims 1 to 6, characterized in that: The rear ends of the two longitudinal partitions are fixedly connected to the transverse partition (18) and are perpendicular to the transverse partition (18); The bottoms of the two longitudinal partitions are spaced apart from the bottom of the sedimentation tank body (100).

8. The vertical flow sedimentation tank suitable for the IFAS treatment process of rural sewage according to any one of claims 1 to 6, characterized in that: Also includes: The control device is electrically connected to the intermediate water pump (9) in the intermediate compartment and can control the start and stop of the intermediate water pump (9) according to a preset duration.

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