Assembly of self-rotating helical draft tube for carrier and aeration tank using the draft tube

Abstract

The present application provides a spiral guide tube with self-rotating carriers, which can make biofilm timely peel off from the carriers, prevent clogging, and also provides an aeration tank using the guide tube, in which sewage realizes more orderly directional circulation flow and increases sewage flow rate. It comprises a barrel arranged above the output end of an aeration device in the aeration tank, a plurality of carrier strings are installed in the barrel, the carrier string comprises a connecting shaft and a filamentous carrier, the connecting shaft is connected with the barrel, the filamentous carrier is attached with microorganisms for treating sewage and generating biofilm, a plurality of horizontally arranged carrier strings in the barrel are spirally arranged from top to bottom and form a spiral channel capable of making sewage spirally rise when the aeration tank is running, the filamentous carrier has a plurality and is radially connected to the periphery of the connecting shaft, and the filamentous carrier can rotate around the connecting shaft under hydraulic action when the aeration tank is running.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aeration equipment, in particular to a spiral guide tube with self-rotating carriers and an aeration tank using the same. BACKGROUND

[0002] Aeration is an essential operating unit in the process of wastewater aerobic biological treatment and is the most energy-consuming part, accounting for 50-80% of the total energy consumption of wastewater treatment plants and 1% of the total electricity consumption in some countries. However, in a biological aeration reactor, only 8-20% of the oxygen is effectively absorbed and utilized by microorganisms. In order to reduce energy consumption, improve oxygen transfer rate, oxygen transfer efficiency and microbial reaction efficiency, it has become an urgent problem in modern wastewater biological treatment. Therefore, research needs to be conducted from multiple angles such as biological reactors, microbial populations, treatment processes and metabolic reaction mechanisms. The biological membrane method for treating wastewater mainly utilizes immobilized microbial communities to form biofilms to remove dissolved and colloidal organic pollutants in wastewater. Biological membrane reactors, as high-efficiency wastewater treatment equipment, are widely used in the field of environmental engineering. For different wastewater characteristics and treatment scales, researchers have developed various aerobic biological membrane reactors to improve wastewater treatment efficiency and save energy consumption. Common biological membrane reactors include the integrated fixed-activated sludge process (IFAS), moving bed biological membrane reactor (MBBR), membrane biological reactor (MBfR), biological filter (ordinary biological filter, high-load biological filter, tower biological filter), biological rotating disc, biological contact oxidation method, biological fluidized bed and granular sludge process, etc.

[0003] Among them, the biological contact oxidation method is developed on the basis of the biological membrane method. Wastewater is in contact with biological membranes and is purified under the action of microorganisms. The aeration method is used to provide dissolved oxygen for microorganisms and to play a stirring and mixing role. At the same time, carrier strings are installed in the aeration tank, and filamentous carriers are installed on the carrier strings to provide microorganisms for attachment and growth. It is a biological treatment method between the activated sludge method and the biological filter method.

[0004] The biological contact oxidation method has the problem that the biofilm on the carrier is not easy to fall off. If the carriers are too densely assembled, i.e. the spacing between the carrier strings is too small, during the growth of the biofilm, the biofilm between the carrier strings will be connected, causing a blockage phenomenon. The blocked carrier strings are also difficult to clean. If the spacing between the carrier strings is too large, there is a high probability that the bubbles will not contact the carriers during the rising process, and the oxygen cannot be fully utilized, and the bubbles cannot be effectively broken. SUMMARY

[0005] In order to solve the problem that the biofilm on the carrier is not easy to fall off in the biological contact oxidation method, the application provides a spiral flow guide cylinder with self-rotating carrier, so that the biofilm can be peeled off from the carrier in time, and the cylinder can prevent blockage, and the application also provides an aeration tank using the cylinder, so that the sewage in the aeration tank can flow in a more orderly and directional manner, and the flow rate of the sewage is increased.

[0006] The technical scheme is as follows: the spiral flow guide cylinder with self-rotating carrier comprises a cylinder body arranged above the output end of an aeration device in an aeration tank, a plurality of carrier strings are arranged in the cylinder body, the carrier string comprises a connecting shaft and a filamentous carrier, the connecting shaft is connected with the cylinder body, and microorganisms for treating sewage and generating biofilm are attached to the filamentous carrier, characterized in that: the plurality of carrier strings arranged horizontally in the cylinder body are arranged in a spiral from top to bottom and form a spiral channel capable of making the sewage spiral upward during operation of the aeration tank, the filamentous carrier has a plurality of and is connected to the periphery of the connecting shaft in a radial manner, and the filamentous carrier can rotate around the connecting shaft under the action of water force during operation of the aeration tank.

[0007] Further, the connecting shaft is fixed on the cylinder body, the filamentous carrier is arranged on the connecting shaft through a shaft sleeve arranged on the connecting shaft, and the inner diameter of the shaft sleeve is greater than the diameter of the connecting shaft.

[0008] Further, a hanger is arranged on the upper edge of the cylinder body, and a base is arranged on the lower edge of the cylinder body.

[0009] Further, the hanger comprises a lifting ring, an upper fixed frame and a connecting rib, the upper fixed frame is fixed on the upper edge of the cylinder body, and the upper fixed frame is connected with the lifting ring through the connecting rib.

[0010] Further, the base comprises a lower fixed frame and a supporting leg, the lower fixed frame is fixed on the lower edge of the cylinder body, and the supporting leg is connected with the lower fixed frame.

[0011] Further, the filamentous carriers are connected on the connecting shaft in rows, and the filamentous carriers in each row are distributed along the generatrix of the connecting shaft.

[0012] Further, the filamentous carriers are connected on the connecting shaft in rows, and the filamentous carriers in each row are arranged in a spiral on the connecting shaft.

[0013] The aeration tank comprises an aeration device, and the aeration device comprises an output end and a gas conveying pipe, characterized in that: the spiral flow guide cylinder with self-rotating carrier is arranged above each or each group of the output end, the water level in the aeration tank is higher than the height of the cylinder body, and the sewage in the aeration tank rises in the cylinder body and falls outside the cylinder body.

[0014] Furthermore, the lower end of the cylinder is not higher than the height of the output end, and the lower end of the cylinder is higher than the gas pipe.

[0015] Beneficial effects: The present invention covers the guide tube above the output end of all aeration devices, limits the ejected air in the guide tube, increases the contact frequency between the bubbles and the filamentous carriers, thereby increasing the frequency of bubble breakage and improving dissolved oxygen. The full coverage of the output end of the aeration device by the guide tube enables the sewage in the aeration tank to form an orderly directional circulation flow with an upward flow inside the tube and a downward flow outside the tube, thereby increasing the overall flow rate of the sewage in the aeration tank under the same aeration volume. The present invention arranges the carrier string horizontally and spirally, which increases the impact force of the water flow on the carrier string. The spiral channel constructed by the spirally arranged carrier string can guide the sewage to flow in a spiral upward direction in the tube, increase the flow distance of the sewage during the rising process, and further increase the flow rate of the sewage under the same aeration volume. The rotatable carrier will rotate around its axis under the impact of the high-speed flowing sewage, so that the biofilm can be peeled off from the carrier more promptly to prevent blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the spiral guide tube structure;

[0017] Figure 2 Schematic diagram of the carrier string structure;

[0018] Figure 3 Schematic diagram of a filamentous carrier structure;

[0019] Figure 4 Schematic diagram of another filamentous carrier structure;

[0020] Figure 5 Schematic diagram of the aeration tank. DETAILED DESCRIPTION

[0021] like Figures 1-3 The spiral guide cylinder equipped with a self-transportable body shown in the figure includes a cylinder 1 arranged above the output end of the aeration device (the aerator 51 described below) in the aeration tank, and a plurality of carrier strings 4 are installed in the cylinder 1. The carrier string 4 includes a connecting shaft 42 and a rotatable carrier 41 composed of a filamentous carrier 411. The connecting shaft 42 is connected to the cylinder 1. Microorganisms for treating sewage and generating biofilms are attached to the filamentous carrier 411. Multiple horizontally arranged carrier strings 4 in the cylinder 1 are spirally arranged from top to bottom and form a spiral channel that can cause the sewage to spiral upward when the aeration tank is operating. It is worth mentioning that the carrier string 4 can be equivalently replaced with a slightly inclined arrangement as long as a spiral channel can be formed. The filamentous carrier 411 has multiple and radially connected filamentous carriers 411 on the periphery of the connecting shaft 42. The filamentous carrier 411 can rotate around the connecting shaft 42 under the action of water when the aeration tank is operating.

[0022] Specifically, the connecting shaft 42 can be fixed to the cylinder 1 by a nut, and the filamentous carrier 411 is mounted on the connecting shaft 42 by a sleeve 412 sleeved on the connecting shaft, wherein the inner diameter of the sleeve 412 is larger than the diameter of the connecting shaft 42. Of course, it is also possible to directly rotatably connect the connecting shaft 42 to the cylinder 1 without using a sleeve, but the mounting structure is correspondingly more complicated.

[0023] Additionally, a hanger 2 is mounted on the upper edge of the cylinder 1, and a base 3 is mounted on the lower edge. Hanger 2 comprises a lifting ring, an upper fixing frame, and connecting ribs. The upper fixing frame is fixed to the upper edge of the cylinder 1 and connected to the lifting ring via connecting ribs. Base 4 comprises a lower fixing frame and legs. The lower fixing frame is fixed to the lower edge of the cylinder, and the legs are connected to the lower fixing frame.

[0024] like Figure 3 As shown, the filamentary carriers 411 are connected to the connecting shaft in rows, and each row of filamentary carriers 411 is distributed along the busbar of the connecting shaft 42. Another form can also be used, that is, Figure 4 As shown, the filamentous carriers 411 are connected to the connecting shaft 42 in rows, and each row of filamentous carriers 411 is arranged on the connecting shaft 42 in a spiral shape.

[0025] like Figure 5 The aeration tank 6 shown includes an aeration device, which includes an aerator 51 and an air pipe 52. A spiral guide tube assembled with a self-transporting body is placed directly above each or each group of aerators 51. For example, the number of aerators 51 covered by each guide tube is an integer to the power of 2, which can be 1, 4, 9, or more. In the schematic diagram, the guide tube covers 4 disc aerators. The water level in the aeration tank 6 is higher than the height of the cylinder 1. The sewage in the aeration tank 6 rises inside the cylinder 1 and falls outside the cylinder 1. The lower end of the cylinder 1 is no higher than the height of the aerator 51 to ensure that all gases enter the cylinder 1. The lower end of the cylinder 1 avoids the air pipe 52 by having its legs higher than the aerator 51.

[0026] Compared with the biological contact oxidation method, the present invention covers the guide tube above all the aerators, restricting the air ejected by the aerator to the guide tube, increasing the contact frequency between the bubbles and the filamentous filler, thereby increasing the frequency of bubble breakage and improving dissolved oxygen. The full coverage of the aerator by the guide tube causes the sewage in the aeration tank to form an orderly directional circulation flow with an upward flow inside the tube and a downward flow outside the tube, thereby increasing the overall flow rate of the sewage in the aeration tank under the same aeration volume. The present invention arranges the carrier strings horizontally and spirally, increasing the impact force of the water flow on the carrier strings. The spiral channel constructed by the spirally arranged carrier strings can guide the sewage to flow in a spiral upward flow inside the tube, increase the flow distance of the sewage during the rising process, and further increase the flow rate of the sewage under the same aeration volume. The rotatable carrier will rotate around its axis under the impact of the high-speed flowing sewage, so that the biofilm can be peeled off from the carrier more promptly to prevent blockage.

[0027] The cylindrical shafts in the carrier string are also easier to secure to the barrel during installation and are less susceptible to deformation or damage under the impact of water flow. Consequently, the resulting spiral channel structure is simpler, more stable, and less prone to clogging. The present invention incorporates a self-rotating carrier to enable the biofilm to be promptly removed from the carrier. Because the rotational motion is much smaller than the carrier's orbital motion, the structure is simpler, more stable, and less susceptible to deformation or damage.

[0028] Example 1:

[0029] A 10m x 10m x 3.9m aeration tank features 7 x 7 spiral guide tubes with self-propelled bodies. Air pipes are laid at even intervals across the bottom of the tank, and disc aerators, each with a diameter of 200mm, are installed on these pipes. The guide tubes completely cover the disc aerators, with each tube covering four disc aerators. This ensures that the wastewater in the tank flows in an orderly manner, rising inside the tubes and descending outside.

[0030] The spiral guide tube is a cylindrical structure, 3 meters high and 1.2 meters in diameter, extending from top to bottom. The hanger consists of a fixed frame, a lifting ring, and several ribs connecting the two. The fixed frame matches the shape and dimensions of the upper edge of the guide tube and is secured to the upper edge of the guide tube by fasteners. When the aeration tank is filled with sewage, the lifting ring rises above the horizontal plane, and the guide tube is submerged in the sewage. While the aeration tank is operating, a lifting device can be used to lift a specific guide tube for cleaning or repair.

[0031] The base consists of a fixed frame and legs. The fixed frame has the same shape and dimensions as the lower edge of the guide tube and is secured to the lower edge of the guide tube using fasteners. When the base is placed at the bottom of the aeration tank, the fixed frame is slightly higher than the aeration tank's gas pipe. The height of the aerator is the same as or higher than the fixed frame.

[0032] The carrier string has a 5mm diameter shaft that passes through the guide tube and is secured with nuts. The carrier strings are arranged in a spiral pattern from top to bottom, with 70 strings, 2 spiral turns, and a 1m pitch. The vertical spacing between adjacent carrier strings is 2*1m / 70 = 0.0286m = 28.6mm, and the angle between adjacent carrier strings when viewed from above is 360°*2 / 70 = 10.286°. The spirally arranged carriers create a spiral channel within the guide tube, allowing the sewage to spiral upward within the tube driven by gas.

[0033] The diameter of the shaft sleeve of the self-rotating carrier is 5.5 mm and the length is 50 mm. When the aeration tank is in operation, the self-rotating carrier can rotate around the axis under the action of hydraulic pressure.

[0034] The filamentous carriers are arranged in a straight line, and 10 rows of filamentous carriers are arranged around the shaft sleeve.

[0035] Example 2

[0036] The difference between the embodiment 1 and the embodiment 2 is that the cylinder of the spiral flow guide is a cuboid with a height of 3 m and a square horizontal section with a side length of 1 m, and the cylinder is through-penetrated from top to bottom. The shaft diameter of the carrier string is 4 mm, and the carrier string is fixed by a nut and penetrates the flow guide. The carrier strings are spirally arranged from top to bottom, the number of the carrier strings is 60, the number of the spiral turns is 2, and the spiral pitch is 1 m. The vertical distance between adjacent carrier strings is 2*1 m / 60=0.0333 m=33.3 mm, and the included angle of adjacent carrier strings in the top view is 360°*2 / 60=12°. The shaft sleeve of the self-rotating carrier has a diameter of 4.5 mm and a length of 40 mm. Eight rows of filamentous carriers are arranged around the shaft sleeve. The arrangement form of the carrier string can be adjusted according to actual needs, as long as the spiral upward flow of water in the cylinder can be formed.

[0037] The working principle of the application is that before the operation of the aeration tank, the spiral flow guide with self-rotating carriers is placed in the aeration tank at equal intervals, so that the flow guide covers all the disc aerators. The flow guide separates the aeration tank into an upward flow area in the cylinder and a downward flow area outside the cylinder, so that the sewage flows upward in the cylinder and downward outside the cylinder, thereby forming an orderly and directional circulating flow, and the sewage can obtain a higher flow speed under the same aeration amount. During the operation of the aeration tank, the disc aerator sprays bubbles. The bubbles are broken into smaller bubbles by the gap formed by the filamentous carriers during the upward movement, thereby increasing the dissolved oxygen content of the aeration tank. During the operation of the aeration tank, the microorganisms adhere to and grow on the surface of the filamentous carriers to form a biofilm. The upward movement of the bubbles drives the upward movement of the sewage in the cylinder. Since the flow resistance of the filamentous carriers to the sewage is much greater than the flow resistance to the bubbles, the sewage in the cylinder mainly spirally rises along the spiral channel formed by the spiral arrangement of the carrier strings. The existence of the spiral channel prolongs the flow distance of the sewage, further increasing the flow speed of the sewage. The high-speed flowing sewage constantly scours the filamentous carriers on the self-rotating carriers, so that the self-rotating carriers rotate around the shaft. The biofilm can be timely detached under the scouring of the sewage and the self-rotation of the carriers, avoiding excessive accumulation.

[0038] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical scope disclosed by the application can be easily thought of by those skilled in the art, and should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A spiral guide cylinder equipped with a self-propelled body, comprising a cylinder disposed above the output end of an aeration device in an aeration tank, wherein a plurality of carrier strings are mounted within the cylinder, the carrier strings comprising a connecting shaft and filamentary carriers, the connecting shaft being connected to the cylinder, and microorganisms for treating sewage and forming biofilms being attached to the filamentary carriers, characterized in that: The plurality of horizontally arranged carrier strings in the cylinder are arranged spirally from top to bottom to form a spiral channel capable of causing the sewage to spirally rise when the aeration tank is in operation. The plurality of filamentary carriers are radially connected to the periphery of the connecting shaft, and the filamentary carriers can rotate around the connecting shaft under the action of hydraulic pressure when the aeration tank is in operation. The filamentous carrier is mounted on the connecting shaft via a shaft sleeve sleeved on the connecting shaft.

2. The spiral guide tube for assembling a self-transportable body according to claim 1, characterized in that: The connecting shaft is fixed on the cylinder, and the inner diameter of the sleeve is larger than the diameter of the connecting shaft.

3. The spiral guide tube for assembling a self-transportable body according to claim 1, characterized in that: A hanger is installed on the upper edge of the cylinder, and a base is installed on the lower edge of the cylinder.

4. The spiral guide tube for assembling a self-transportable body according to claim 3, characterized in that: The hanger includes a lifting ring, an upper fixing frame and connecting ribs. The upper fixing frame is fixed to the upper edge of the cylinder, and the upper fixing frame is connected to the lifting ring through the connecting ribs.

5. The spiral guide tube for assembling a self-transportable body according to claim 3, characterized in that: The base includes a lower fixing frame and supporting legs. The lower fixing frame is fixed to the lower edge of the cylinder, and the supporting legs are connected to the lower fixing frame.

6. The spiral guide tube for assembling a self-transportable body according to claim 1, characterized in that: The filamentous carriers are connected to the connecting shaft in rows, and the filamentous carriers in each row are distributed along the generatrix of the connecting shaft.

7. The spiral guide tube for assembling a self-transportable body according to claim 1, characterized in that: The filamentous carriers are connected to the connecting shaft in rows, and the filamentous carriers in each row are arranged in a spiral shape on the connecting shaft.

8. An aeration tank comprising an aeration device, wherein the aeration device comprises an output end and an air delivery pipe, characterized in that: A spiral guide cylinder equipped with a self-transportable body as described in any one of claims 1 to 7 is placed directly above each or each group of the output ends. The water level in the aeration tank is higher than the height of the cylinder. The sewage in the aeration tank rises inside the cylinder and falls outside the cylinder.

9. The aeration tank according to claim 8, characterized in that: The lower end of the cylinder is not higher than the height of the output end, and the lower end of the cylinder is higher than the gas pipe.

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