Cyclone desanding system for sewage treatment

Abstract

The utility model discloses a rotational flow desanding system for sewage treatment, and belongs to the technical field of pretreatment of sewage treatment plants. The sewage treatment cyclone desanding system comprises a grit chamber and an air header pipe communicated with an air supply pipe of a biochemical system in a sewage treatment plant area, the grit chamber comprises an upper-layer cyclone chamber and a lower-layer grit collection chamber, a stirring device is mounted in the cyclone chamber, a sand hopper is arranged in the grit collection chamber, and a sand lifter is mounted at the bottom of the sand hopper. An air inlet of the sand lifting device is communicated with a sand lifting air pipe, an air inlet of the sand lifting air pipe is communicated with an air main pipe, a sand outlet of the sand lifting device is communicated with a sand discharging pipe, and a sand-water separator is arranged at a sand outlet of the sand discharging pipe. According to the utility model, rapid sand setting and separation can be carried out on inflow sewage, and meanwhile, the device has the advantages that blockage is not easily caused, the content of organic matters in treated sand grains is extremely low, and a fan does not need to be independently matched.

Description

Technical Field

[0001] The utility model relates to the technical field of pretreatment in sewage treatment plants, in particular to a cyclone sand removal system for sewage treatment. Background Art

[0002] The influent of urban domestic sewage treatment plants often contains a lot of sand particles, which need to be pre-treated in a grit chamber. The grit chamber is generally set behind the fine screen and before the primary sedimentation tank or the secondary biochemical treatment system. The function of the grit chamber is to remove sand. The composition of sand includes heavier solid substances such as sand particles, gravel, slag, etc., and its sedimentation rate or relative density is significantly greater than the organic solid substances in the sewage. The form of the grit chamber can be divided into horizontal flow grit chamber, vertical flow grit chamber, aerated grit chamber and cyclone grit chamber according to the tank type. The cyclone grit chamber uses mechanical force or hydraulic force to control the flow state and flow rate of sewage in the tank, accelerate the precipitation of sand particles, and the organic matter is left in the sewage, which has the advantage of small space. At present, most sewage treatment plants use cyclone grit chambers.

[0003] In the prior art, the cyclone sand settling tank mainly has the following problems:

[0004] 1. The sand in the sand hopper at the bottom of the cyclone sand settling tank is easily compacted due to sedimentation and difficult to pump out, resulting in blockage of the sand discharge system;

[0005] 2. The cyclone grit chamber that adopts air lift to discharge sand often needs to be equipped with a separate Roots blower for air supply and a building for storing the Roots blower room, which leads to increased investment and operating costs.

[0006] 3. The discharged sand still contains a lot of organic matter, which further reduces the carbon source content in the sewage and is not conducive to subsequent biological treatment. Summary of the invention

[0007] The utility model provides a cyclone sand removal system for sewage treatment, which can quickly settle and separate the influent sewage, and has the advantages of not being easy to be blocked, extremely low organic matter content in the treated sand particles, and no need for a separate supporting fan.

[0008] To achieve the above-mentioned purpose, the utility model designs a cyclone sand removal system for sewage treatment, comprising a sand settling tank and an air main connected to the air supply pipe of the biochemical system of the sewage treatment plant, the sand settling tank comprising an upper cyclone tank and a lower cyclone sand collection tank, a stirring device is installed in the cyclone tank, a sand hopper is arranged in the cyclone sand collection tank, a sand lifter is installed at the bottom of the sand hopper, the air inlet of the sand lifter is connected to a sand lifting air pipe, the air inlet of the sand lifting air pipe is connected to the air main, the sand outlet of the sand lifter is connected to a sand discharge pipe, and the sand outlet of the sand discharge pipe is provided with a sand-water separator.

[0009] Preferably, the sand-water separator comprises a sand collecting bin of inclined design, a sand washer is installed in the sand collecting bin, a sand inlet is opened on the top of the sand collecting bin and the sand inlet is located above the sand washer, and the sand inlet is connected to the sand outlet of the sand discharge pipe.

[0010] Preferably, a sand outlet hole is provided at the lowest point of the bottom surface of the sand collecting bin, and support frames are provided at both ends of the sand collecting bin.

[0011] Preferably, the sand washer is a perforated aeration pipe, and the air inlet of the perforated aeration pipe is connected to a sand washing air supply pipe.

[0012] Preferably, the sand washing air supply pipe is connected to the air main, and an air supply pipe valve is installed on the sand washing air supply pipe.

[0013] Preferably, a drainage hole is provided on the upper portion of the side wall of the sand collecting bin, and the drainage hole is connected to a drainage pipe.

[0014] Preferably, a screw conveyor is provided below the sand collecting bin, a feed port of the screw conveyor is located corresponding to the sand outlet hole of the sand bin, and a transport vehicle is parked below the sand outlet of the screw conveyor.

[0015] Preferably, the air main pipe is also connected to a dredging air pipe, and the dredging air pipe extends into the sand settling tank to the bottom of the sand hopper.

[0016] Preferably, a dredging pipe valve is provided on the air dredging pipe.

[0017] Preferably, a sand lifting pipe valve is provided on the sand lifting air pipe.

[0018] Preferably, the bottom area of ​​the cyclone pool is funnel-shaped.

[0019] Beneficial effects of the utility model:

[0020] 1. The utility model adopts the air lift sand discharge method, and the input air is connected to the aeration air main pipe of the biochemical pool. There is no need to set up a separate sand settling tank blower and installation room, which saves project construction and operation costs.

[0021] 2. A special air flushing pipe is designed at the sand lifter at the bottom of the sand settling area of ​​the utility model. The air is connected to the aeration air dry pipe of the biochemical pool, which can reduce the blockage of the sand discharge pipe.

[0022] 3. A special sand washer is provided inside the sand-water separator of the utility model for aeration and scrubbing, which can thoroughly clean the organic matter in the sand particles, and the sand washing air is connected to the aeration air dry pipe of the biochemical pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a process flow chart of the utility model;

[0024] Reference numerals:

[0025] 1 grit chamber, 11 cyclone chamber, 12 grit collection chamber, 121 sand hopper,

[0026] 2 stirring device,

[0027] 3 sand lifter, 31 sand discharge pipe,

[0028] 4 air main pipe, 41 sand lifting air pipe, 411 sand lifting pipe valve, 42 sand washing air pipe, 421 air pipe valve, 43 dredging air pipe, 431 dredging pipe valve,

[0029] 5 sand-water separator, 51 sand collecting bin, 511 sand bin sand outlet hole, 512 drainage hole, 52 sand washer, 53 screw conveyor, 54 drainage pipe, 55 support frame,

[0030] 6 transport vehicles. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 on the present application.

[0034] In addition, 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 the indicated technical features. 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, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0036] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Example

[0038] like Figure 1 The sewage treatment cyclone sand removal system shown comprises a sand settling tank 1 and an air main pipe 4 connected to the air supply pipe of the biochemical system of the sewage treatment plant, and is characterized in that the sand settling tank 1 comprises an upper cyclone tank 11 and a lower cyclone collecting tank 12, and the bottom area of ​​the cyclone tank 11 is funnel-shaped. A stirring device 2 is installed in the cyclone tank 11, a sand hopper 121 is arranged in the cyclone collecting tank 12, a sand lifter 3 is installed at the bottom of the sand hopper 121, the air inlet of the sand lifter 3 is connected to a sand lifting air pipe 41, and a sand lifting pipe valve 411 is arranged on the sand lifting air pipe 41. The air inlet of the sand lifting air pipe 41 is connected to the air main pipe 4, and the air main pipe 4 is also connected to a dredging air pipe 43, which extends into the sand settling tank 1 until the bottom of the sand hopper 121. A dredging pipe valve 431 is arranged on the dredging air pipe 43. The sand outlet of the sand lifter 3 is connected to a sand discharge pipe 31 , and a sand-water separator 5 is provided at the sand outlet of the sand discharge pipe 31 .

[0039] The sand-water separator 5 includes a sand collecting bin 51 of inclined design, a sand washer 52 is installed in the sand collecting bin 51, a sand inlet is provided at the top of the sand collecting bin 51 and the sand inlet is located above the sand washer 52, the sand inlet is connected to the sand outlet of the sand discharge pipe 31, a sand outlet hole 511 is provided at the lowest point of the bottom surface of the sand collecting bin 51, and support frames 55 are provided at both ends of the sand collecting bin 51. The sand washer 52 is a perforated aeration pipe, and the air inlet of the perforated aeration pipe is connected to the sand washing air supply pipe 42. The sand washing air supply pipe 42 is connected to the air main 4, and an air supply pipe valve 421 is installed on the sand washing air supply pipe 42. A drainage hole 512 is provided on the upper part of the side wall of the sand collecting bin 51, and the drainage hole 512 is connected to a drainage pipe 54. A screw conveyor 53 is provided below the sand collecting bin 51 . The feed port of the screw conveyor 53 is located corresponding to the sand outlet hole 511 of the sand bin. A transport vehicle 6 is parked below the sand outlet of the screw conveyor 53 .

[0040] The following describes the process flow of the utility model when it works:

[0041] After the wastewater to be desanded enters the grit chamber 1, the stirring device 2 is turned on. The stirring device 2 controls the flow state and flow rate of the wastewater to be desanded in the grit chamber 1, accelerates the sedimentation of the sand particles, and makes the sand particles settle in the sand bucket 121 of the grit chamber 12. There is a sand lifter 3 at the bottom of the sand bucket 121. The sand lifter 3 transports the precipitated sand particles to the sand washer 52 of the sand collection bin 51 through the sand discharge pipe 31. The sand washer 52 is a perforated aeration pipe. The sand particles are aerated and scrubbed by the sand washer 52 to thoroughly clean the organic matter attached to the sand particles. The sand collection bin 51 adopts an inclined design. The aerated sand particles slide to the sand outlet of the sand collection bin 51. The sand outlet of the sand collection bin 51 is connected to the sand inlet of the screw conveyor 53. The processed sand particles are transported to the transport vehicle 6 through the screw conveyor 53.

[0042] When the sand grains in the sand bucket 121 are deposited or before the sand lifting pipe valve 411 is opened, the dredging pipe valve 431 is opened, and the dredging air pipe 43 can be flushed to loosen the sand grains deposited in the sand bucket 121. Then the sand is lifted by the sand lifter 3.

[0043] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A cyclone sand removal system for sewage treatment, comprising a sand settling tank (1) and an air main pipe (4) connected to the air supply pipe of the biochemical system of the sewage treatment plant, characterized in that: The grit chamber (1) comprises an upper cyclone chamber (11) and a lower cyclone chamber (12); a stirring device (2) is installed in the cyclone chamber (11); a sand hopper (121) is arranged in the cyclone chamber (12); a sand lifter (3) is installed at the bottom of the sand hopper (121); an air inlet of the sand lifter (3) is connected to a sand lifter air pipe (41); an air inlet of the sand lifter air pipe (41) is connected to an air main pipe (4); a sand outlet of the sand lifter (3) is connected to a sand discharge pipe (31); and a sand-water separator (5) is arranged at the sand outlet of the sand discharge pipe (31).

2. The cyclone sand removal system for sewage treatment according to claim 1 is characterized by: The sand-water separator (5) comprises a sand collecting bin (51) of inclined design, a sand washer (52) is installed in the sand collecting bin (51), a sand inlet is opened on the top of the sand collecting bin (51) and the sand inlet is located above the sand washer (52), and the sand inlet is connected to the sand outlet of the sand discharge pipe (31).

3. The cyclone sand removal system for sewage treatment according to claim 2 is characterized by: A sand outlet hole (511) is provided at the lowest point of the bottom surface of the sand collecting bin (51), and support frames (55) are provided at both ends of the sand collecting bin (51).

4. The cyclone sand removal system for sewage treatment according to claim 2 is characterized by: The sand washer (52) is a perforated aeration pipe, and the air inlet of the perforated aeration pipe is connected to the sand washing air supply pipe (42).

5. The cyclone sand removal system for sewage treatment according to claim 4 is characterized by: The sand-washing air delivery pipe (42) is connected to the air main pipe (4), and an air delivery pipe valve (421) is installed on the sand-washing air delivery pipe (42).

6. The cyclone sand removal system for sewage treatment according to claim 2 is characterized by: A drainage hole (512) is provided on the upper portion of the side wall of the sand collecting bin (51), and the drainage hole (512) is connected to a drainage pipe (54).

7. The cyclone sand removal system for sewage treatment according to claim 2 is characterized by: A screw conveyor (53) is provided below the sand collecting bin (51), a feed port of the screw conveyor (53) is located corresponding to the sand outlet hole (511) of the sand bin, and a transport vehicle (6) is parked below the sand outlet of the screw conveyor (53).

8. The cyclone sand removal system for sewage treatment according to claim 1, characterized in that: The main air pipe (4) is also connected to a dredging air pipe (43), and the dredging air pipe (43) extends into the sand settling tank (1) to the bottom of the sand hopper (121).

9. The cyclone sand removal system for sewage treatment according to claim 8, characterized in that: The dredging air pipe (43) is provided with a dredging pipe valve (431).

10. The cyclone sand removal system for sewage treatment according to claim 1, characterized in that: The sand lifting air pipe (41) is provided with a sand lifting pipe valve (411).

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