An oxidation ditch biochemical aeration system for a sewage treatment station

Abstract

The present invention discloses a biochemical aeration system for an oxidation ditch in a sewage treatment plant, which includes a first aeration pipe group (1) and a second aeration pipe group (2) located in the middle layer of the aerobic zone of the oxidation ditch. A swirl aerator (3) is arranged between the first aeration pipe group (1) and the second aeration pipe group (2); the first aeration pipe group (1) includes two symmetrically distributed first aeration pipes (101), and the first aeration pipes (101) are inclined; the second aeration pipe group (2) includes multiple concentrically arranged annular aeration pipes (201) up and down. An air delivery connecting pipe (202) is arranged between adjacent annular aeration pipes (201), and the diameters of the annular aeration pipes (201) decrease successively from bottom to top. The present invention has the characteristic of being able to effectively improve the overall aeration effect.

Description

Technical Field

[0001] The present invention relates to an aeration device, in particular to a biochemical aeration system for an oxidation ditch in a sewage treatment plant. Background Art

[0002] An oxidation ditch is an activated sludge treatment system. By arranging several partition walls in the pool, the oxidation ditch is divided into three zones: an anaerobic zone, an anoxic zone, and an aerobic zone. The aeration equipment is a key equipment in the aerobic zone treatment of a sewage treatment plant. The aeration device can make the sewage treatment mixed liquor reach a sufficient dissolved oxygen DO, which is beneficial to the growth and development of aerobic microorganisms. Traditional aeration methods and devices include, for example, surface aeration, deep water aeration, perforated pipe aeration, spiral aeration, hydraulic stirring aeration, jet aeration, submersible flywheel aeration, Nickney aeration, microporous aeration (disk type, rod type, and tube type), carborundum aeration, and non-blocking ratchet shear aeration, etc. However, the position of the existing aeration device is generally fixed, and the aeration area is limited, resulting in some areas not being irradiated, making the overall aeration effect not ideal. Therefore, the existing technology has the problem of unsatisfactory overall aeration effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a biochemical aeration system for an oxidation ditch in a sewage treatment plant. The present invention has the characteristic of being able to effectively improve the overall aeration effect.

[0004] The technical solution of the present invention: A biochemical aeration system for an oxidation ditch in a sewage treatment plant includes a first aeration pipe group and a second aeration pipe group located in the middle layer of the aerobic zone of the oxidation ditch. A swirl aerator is arranged between the first aeration pipe group and the second aeration pipe group; the first aeration pipe group includes two symmetrically distributed first aeration pipes, and the first aeration pipes are inclined; the second aeration pipe group includes multiple concentrically distributed annular aeration pipes arranged up and down. An air transmission connecting pipe is arranged between adjacent annular aeration pipes, and the diameter of the annular aeration pipes decreases successively from bottom to top.

[0005] In the foregoing biochemical aeration system for an oxidation ditch in a sewage treatment plant, the upper surface of the annular aeration pipe is provided with annularly distributed second aeration heads.

[0006] In the foregoing biochemical aeration system for an oxidation ditch in a sewage treatment plant, the side wall surface and the upper wall surface of the first aeration pipe are both provided with first aeration heads.

[0007] In the foregoing biochemical aeration system for an oxidation ditch in a sewage treatment plant, a lower-end air transmission support pipe is arranged at the connection between the two first aeration pipes, and the lower-end air transmission support pipe is connected to an oxygenation pump through a trachea.

[0008] In the foregoing biochemical aeration system for an oxidation ditch in a sewage treatment plant, a sleeve is sleeved outside the lower-end air transmission support pipe. The outer wall surface of the sleeve is provided with a spiral stirring paddle, and the upper and lower ends of the sleeve are provided with rotary drive blades.

[0009] In the aforementioned oxidation ditch biochemical aeration system of a sewage treatment station, a support rod connected to the bottom surface of the aerobic zone of the oxidation ditch is provided at the bottom of the second aeration pipe group. A central support rod is provided at the central axis of the second aeration pipe group. A plurality of rotation sleeves distributed up and down are sleeved outside both the support rod and the central support rod, and stirring paddles are provided on the outer wall surface of the rotation sleeves.

[0010] The number of the swirl aerators is 2.

[0011] Compared with the prior art, in the present invention, a first aeration pipe group composed of two first aeration pipes symmetrically distributed obliquely, a swirl aerator, and a second aeration pipe group composed of a plurality of annular aeration pipes distributed concentrically and with gradually decreasing diameters are sequentially arranged along the water flow direction in the aerobic zone of the oxidation ditch. Through the mutual cooperation among the three, the aeration area can be effectively enlarged, and thus the overall aeration effect in the oxidation ditch can be improved. In addition, in the present invention, a lower-end air delivery support pipe is provided below the first aeration pipe, a sleeve and a spiral stirring paddle are sleeved outside the lower-end air delivery support pipe. By providing a support rod, a rotation sleeve, and a stirring paddle below the second aeration pipe group, the flow of water is utilized to drive the spiral stirring paddle and the stirring paddle to rotate, stirring the lower-layer sewage to generate disturbance, facilitating the flow between the upper and lower layers of sewage, and thus the aeration effect of sewage in different regions can be improved. To sum up, the present invention has the characteristic of being able to effectively improve the overall aeration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural view of the present invention;

[0013] Figure 2 is Figure 1 an enlarged view of the second aeration pipe group in

[0014] Figure 3 is a structural view of the first aeration pipe group;

[0015] Figure 4 is a structural view of the second aeration pipe group.

[0016] The reference signs in the drawings are: 1 - first aeration pipe group, 2 - second aeration pipe group, 3 - swirl aerator, 101 - first aeration pipe, 102 - first aeration head, 103 - lower-end air delivery support pipe, 104 - sleeve, 105 - spiral stirring paddle, 106 - rotation driving paddle blade, 201 - annular aeration pipe, 202 - air delivery connecting pipe, 203 - second aeration head, 204 - central support rod, 205 - rotation sleeve, 206 - stirring paddle, 207 - support rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0018] Embodiment. An oxidation ditch biochemical aeration system for a sewage treatment station is configured as follows Figures 1-4 shown, including a first aeration pipe group 1 and a second aeration pipe group 2 located in the middle layer of the aerobic zone of the oxidation ditch. A swirl aerator 3 is provided between the first aeration pipe group 1 and the second aeration pipe group 2; the first aeration pipe group 1 includes two first aeration pipes 101 symmetrically distributed, and the first aeration pipes 101 are inclined; the second aeration pipe group 2 includes multiple annular aeration pipes 201 concentrically distributed up and down. An air delivery connecting pipe 202 is provided between adjacent annular aeration pipes 201, and the diameter of the annular aeration pipes 201 decreases sequentially from bottom to top.

[0019] The upper surface of the annular aeration pipe 201 is provided with annularly distributed second aeration heads 203.

[0020] The side wall surface and the upper wall surface of the first aeration pipe 101 are both provided with first aeration heads 102.

[0021] A lower end air delivery support pipe 103 is provided at the connection between the two first aeration pipes 101, and the lower end air delivery support pipe 103 is connected to an aeration pump through a trachea.

[0022] A sleeve 104 is sleeved outside the lower end air delivery support pipe 103. A spiral stirring paddle 105 is provided on the outer wall surface of the sleeve 104, and rotary drive blades 106 are provided at the upper and lower ends of the sleeve 104.

[0023] The bottom of the second aeration pipe group 2 is provided with a support rod 207 connected to the bottom surface of the aerobic zone of the oxidation ditch. A central support rod 204 is provided at the central axis of the second aeration pipe group 2. A plurality of rotating sleeves 205 distributed up and down are sleeved outside the support rod 207 and the central support rod 204, and stirring paddles 206 are provided on the outer wall surface of the rotating sleeves 205.

[0024] The number of the swirl aerators 3 is 2.

[0025] The side wall surface and the upper wall surface of the first aeration pipe are provided with first aeration heads, which can perform aeration treatment from multiple directions and improve the aeration effect.

[0026] The air delivery connecting pipe at the bottom is connected to an aeration pump through a trachea.

[0027] A support frame spanning the oxidation ditch is provided at the top of the aerobic zone of the oxidation ditch. A transverse movement screw mechanism is provided on the support frame. A slider seat is provided below the transverse movement screw mechanism. An elevating mechanism is further provided below the slider seat. A bracket for fixing the swirl aerator is provided at the bottom of the elevating mechanism. The air pump is fixed below the slider seat and is connected to the air inlet of the swirl aerator through a trachea.

[0028] The slider base includes a nut slider connected to the transverse translation screw mechanism. Angle adjustment lugs are provided at both ends below the nut slider. A rotating shaft is provided between the two angle adjustment lugs, and an adjustment fixing base is provided below the rotating shaft. One end of the rotating shaft is provided with a gear, the gear is connected to a driving gear, and the driving gear is connected to a driving motor.

[0029] Through the mutual cooperation between the above structures, the swirling aerator can achieve horizontal translation, lifting and angle adjustment of the position, flexibly change the aeration position and aeration angle, which is beneficial to improving the aeration effect in the aerobic tank.

[0030] The working process of the present invention: Sewage flows through the anaerobic zone and the anoxic zone in sequence and then flows into the aerobic zone. The flow of sewage is promoted by the underwater booster in the aerobic zone. When the sewage flows into the aerobic zone, it will pass through the aeration of the first aeration pipe group, the aeration of the swirling aerator and the aeration of the second aeration pipe group in sequence. When the sewage flows through the first aeration pipe group, the sewage will be turbulently flowed under the action of the spiral stirring paddle. The oxygenation pump inputs air into the air pipe and sprays it from the first aeration head of the first aeration pipe, and performs aeration treatment along the inclined surface of the first aeration pipe. When the sewage flows through the swirling aerator, the sewage enters from the water inlet of the swirling aerator, and air enters from the air inlet of the swirling aerator to form a negative pressure in the upper space of the swirling aerator. The sewage flows out from the upper end of the swirling aerator under the action of the negative pressure to complete the secondary aeration treatment. When the sewage flows through the second aeration pipe group, the stirring paddles at the lower part and inside will rotate, driving the sewage to be turbulently flowed, and air is sprayed from the second aeration heads of each annular aeration pipe to achieve aeration treatment from different positions.

Claims

1. A biochemical aeration system for oxidation ditches in a sewage treatment plant, characterized in that: It includes a first aeration pipe group (1) and a second aeration pipe group (2) located in the middle layer of the aerobic zone of the oxidation ditch. A swirl aerator (3) is provided between the first aeration pipe group (1) and the second aeration pipe group (2); the first aeration pipe group (1) includes two symmetrically distributed first aeration pipes (101), and the first aeration pipes (101) are inclined; the second aeration pipe group (2) includes multiple annular aeration pipes (201) distributed concentrically up and down. An air transmission connecting pipe (202) is provided between adjacent annular aeration pipes (201), and the diameter of the annular aeration pipes (201) decreases sequentially from bottom to top; a second aeration head (203) distributed annularly is provided on the upper surface of the annular aeration pipe (201); first aeration heads (102) are provided on the side wall surface and the upper wall surface of the first aeration pipe (101); a lower-end air transmission support pipe (103) is provided at the connection between the two first aeration pipes (101), and the lower-end air transmission support pipe (103) is connected to an aeration pump through a trachea; a sleeve (104) is sleeved outside the lower-end air transmission support pipe (103), a spiral stirring paddle (105) is provided on the outer wall surface of the sleeve (104), and rotary drive blades (106) are provided at the upper and lower ends of the sleeve (104); a support rod (207) connected to the bottom surface of the aerobic zone of the oxidation ditch is provided at the bottom of the second aeration pipe group (2), a central support rod (204) is provided at the central axis of the second aeration pipe group (2), and multiple rotating sleeves (205) distributed up and down are sleeved outside the support rod (207) and the central support rod (204), and stirring paddles (206) are provided on the outer wall surface of the rotating sleeves (205); the number of the swirl aerators (3) is 2; a support frame spanning the oxidation ditch is provided at the top of the aerobic zone of the oxidation ditch. A transverse movement lead screw mechanism is provided on the support frame, a slider seat is provided below the transverse movement lead screw mechanism, a lifting mechanism is further provided below the slider seat, a bracket for fixing the swirl aerator is provided at the bottom of the lifting mechanism, and an air pump is fixed below the slider seat and is connected to the air inlet of the swirl aerator through a trachea; The slider seat includes a nut slider connected to the transverse movement lead screw mechanism. Angle adjustment support ears are provided at both ends below the nut slider. A rotating shaft is provided between the two angle adjustment support ears, and an adjustment fixing seat is provided below the rotating shaft; a gear is provided at one end of the rotating shaft, the gear is connected to a driving gear, and the driving gear is connected to a driving motor.

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