Wastewater reflux device integrated with defoaming function

Abstract

The utility model belongs to the technical field of wastewater treatment, and discloses a wastewater reflux device integrated with a defoaming function, which comprises a wastewater reflux lift pump and a reflux pipeline system which are connected through a flange, the backflow pipeline system comprises a backflow main pipe, and a sludge discharge branch pipe, a sludge backflow branch pipe, a nitrification liquid backflow branch pipe and a spraying branch pipe which are respectively and directly communicated with the backflow main pipe through pipe fittings. First electric valves are mounted on the sludge discharge branch pipes in an equal-diameter manner; a second electric valve is mounted on the sludge backflow branch pipe in an equal-diameter manner; a third electric valve is mounted on the nitrification liquid backflow branch pipe in an equal-diameter manner; the spray branch pipe is provided with a hand-operated valve in a reducing manner, and the hand-operated valve is provided with an upper row of round holes and a lower row of round holes along the direction of the tail end of the branch pipe, wherein the included angle between the center line of the round holes and the central horizontal plane of the spray branch pipe is + / -45 degrees. The device is applied to an organic wastewater biological treatment system, and efficient integration of foam elimination, sludge backflow, nitrification liquid backflow and sludge discharge of a biochemical pool is realized.

Description

Technical Field

[0001] The utility model relates to a wastewater reflux device integrating a defoaming function, which is particularly applicable to a wastewater biological treatment system that requires defoaming and reflux simultaneously, and belongs to the technical field of wastewater treatment. Background Technique

[0002] During the production process of livestock and poultry slaughter and meat processing, a large amount of wastewater is generated with a high organic matter concentration. To avoid the health hazards and environmental pollution caused by direct discharge of wastewater, physical and chemical pretreatment is usually carried out, followed by anaerobic hydrolysis acidification + aerobic biochemical treatment to achieve microbial degradation of organic matter and removal of nitrogen and phosphorus to meet the wastewater discharge requirements.

[0003] Based on the above water quality characteristics of slaughter and meat processing wastewater, during the aerobic biochemical treatment process, whether using the activated sludge method or the biological contact oxidation method, with the prolongation of the aeration time in the aeration tank, a large amount of foam will inevitably overflow from the sewage tank, affecting the normal operation and aesthetics of the equipment, and defoaming treatment of the aeration tank is required. At the same time, for biological nitrogen and phosphorus removal, nitrification liquid reflux, sludge reflux, and discharge of surplus sludge from the sedimentation tank need to be set up to ensure the removal effect of nitrogen and phosphorus in the biochemical system. For the above technical requirements, the existing technical route is to set up independent functional units for foam inhibition and elimination, nitrification liquid reflux, and surplus sludge discharge, which are realized by different functional units respectively. This not only has a complex structure and cumbersome operation but also increases equipment investment and operating costs. Content of the Utility Model

[0004] The utility model discloses a wastewater reflux device integrating a defoaming function, which realizes the integration of foam elimination, sludge reflux, nitrification liquid reflux, and surplus sludge discharge in the wastewater biochemical treatment system. To achieve the above purpose, the solution of the utility model is as follows:

[0005] (1) A wastewater reflux device integrating a defoaming function: including a wastewater reflux lift pump and a reflux pipeline system. The reflux pipeline system is flange-connected to the outlet flange of the wastewater reflux lift pump through a first flange. The reflux pipeline system includes a reflux main pipe and a sludge discharge branch pipe, a sludge reflux branch pipe, a nitrification liquid reflux branch pipe, and a spray branch pipe that are directly connected to the reflux main pipe through pipe fittings respectively.

[0006] (2) Preferably, a ball check valve is installed at the outlet of the first flange, and the wastewater reflux lift pump is a flange-connected submersible pump.

[0007] (3) Preferably, the sludge discharge branch pipe is installed in a wafer type by a second flange, a first electric valve, and a third flange and is led out from the reflux main pipe with the same diameter.

[0008] (4) Preferably, the sludge return branch pipe is installed in a wafer - type manner through the fourth flange, the second electric valve, and the fifth flange and is led out from the return main pipe with the same diameter.

[0009] (5) Preferably, the nitrification liquid return branch pipe is installed in a wafer - type manner through the sixth flange, the third electric valve, and the seventh flange and is led out from the return main pipe with the same diameter.

[0010] (6) Preferably, the spray branch pipe is led out from the return main pipe with a reduced diameter through a manual valve arranged close to the return main pipe, and a pipe plug is used as the end of the spray branch pipe. Preferably, the spray branch pipe is provided with two upper and lower rows of round holes with equal spacing and equal aperture along the direction of the end pipe plug from the outlet of the manual valve. Further preferably, the center lines of the holes in the upper and lower two rows form an angle of ±45 degrees with the horizontal plane of the center of the spray branch pipe respectively, the horizontal distance between the centers of the holes in the upper and lower two rows is 200 mm - 300 mm, and the aperture of the holes is 3 - 4 mm.

[0011] (7) Preferably, the length of the spray branch pipe, the number of the holes, and the number of the spray branch pipes are adapted to the planar size of the aeration tank and the number of aeration tanks that need to be sprayed for defoaming. Brief Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of a wastewater return device integrating a defoaming function according to the present invention;

[0013] Figure 2 is Figure 1 a partial schematic diagram of the spray branch pipe;

[0014] Figure 3 is Figure 2 a partial cross - sectional schematic diagram;

[0015] Figure 4 is an application schematic diagram of a wastewater return device integrating a defoaming function according to the present invention.

[0016] Reference Numerals:

[0017] 1. Wastewater return lift pump; 2. Return pipeline system; 21. First flange; 22. Ball - type check valve; 23. Return main pipe; 3. Sludge discharge branch pipe; 31. First electric valve; 32. Second flange; 33. Third flange; 4. Sludge return branch pipe; 41. Second electric valve; 42. Fourth flange; 43. Fifth flange; 5. Nitrification liquid return branch pipe; 51. Third electric valve; 52. Sixth flange; 53. Seventh flange; 6. Spray branch pipe; 61. Manual valve; 62. Pipe plug; 63. Round hole. Detailed Description of the Embodiment

[0018] To highlight the technical features of the solution of the present utility model, other necessary facilities included in the wastewater biological treatment system, such as aeration equipment and the electric control system, will not be elaborated herein. The aeration tank mentioned in this application is equivalent to the aerobic tank, and those skilled in the art should have a full understanding of this.

[0019] The following will further describe the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to illustrate the present utility model and are not regarded as limiting the present utility model.

[0020] As Figure 1 shown, a wastewater reflux device integrating a defoaming function includes a wastewater reflux lift pump 1 and a reflux pipeline system 2.

[0021] As Figure 1 shown, the reflux pipeline system 2 is flange-connected to the outlet flange of the wastewater reflux lift pump 1 through a first flange 21. The reflux pipeline system 2 includes a reflux main pipe 23 and a sludge discharge branch pipe 3, a sludge reflux branch pipe 4, a nitrification liquid reflux branch pipe 5, and a spray branch pipe 6 that are directly connected to the reflux main pipe 23 through pipe fittings respectively.

[0022] As Figure 1 shown, a ball check valve 22 is installed at the outlet of the first flange 21, and the wastewater reflux lift pump 1 is a flange-connected submersible pump.

[0023] As Figure 1 and Figure 4 shown, the sludge discharge branch pipe 3 is installed in a wafer-type manner through a second flange 32, a first electric valve 31, and a third flange 33 and is led out from the reflux main pipe 23 with the same diameter to the sludge tank of the combined tank.

[0024] As Figure 1 and Figure 4 shown, the sludge reflux branch pipe 4 is installed in a wafer-type manner through a fourth flange 42, a second electric valve 41, and a fifth flange 43 and is led out from the reflux main pipe 23 with the same diameter to the anaerobic tank of the combined tank.

[0025] As Figure 1 and Figure 4 shown, the nitrification liquid reflux branch pipe 5 is installed in a wafer-type manner through a sixth flange 52, a third electric valve 51, and a seventh flange 53 and is led out from the reflux main pipe 23 with the same diameter to the anoxic tank of the combined tank.

[0026] As Figure 1 and Figure 4 shown, the spray branch pipe 6 is led out from the reflux main pipe through a reducing tee with a reduced diameter by a manual ball valve 61 arranged close to the reflux main pipe 23 to both sides of the aerobic tank of the combined tank, and a pipe plug 62 is used as the end of the spray branch pipe.

[0027] As Figure 2As shown, the spray branch pipe 6 is provided with two upper and lower rows of round holes with a diameter of 3 - 4 mm at intervals of 200 - 300 mm along the direction of the end pipe plug 62.

[0028] As Figure 3 shown, the center lines of the holes in the two upper and lower rows of openings form an angle of ±45 degrees with the horizontal plane of the center of the spray branch pipe respectively.

[0029] As Figure 4 shown, for the spray branch pipe of a wastewater return device integrating defoaming function, the length and the number of openings are adapted to the length of the aerobic tank that needs to be spray - defoamed, and the number of spray branch pipes is adapted to the width of the aerobic tank that needs to be spray - defoamed.

[0030] In a further embodiment of the present application, as Figure 4 shown, a wastewater return device integrating defoaming function is applied to a wastewater biological treatment system. The wastewater return lift pump 1 is arranged at the bottom of the return area of the combined tank that communicates with the bottom of the sedimentation tank, and the wastewater return lift pump operates continuously.

[0031] Sludge discharge: When a certain amount of sludge is deposited at the bottom of the sedimentation tank, to avoid the deterioration of the effluent quality of the sedimentation tank caused by sludge denitrification and anaerobic fermentation in the sedimentation tank, the wastewater return lift pump 1 discharges the sedimentation tank sludge to the sludge tank through the first electric valve 31 opened on the reflux main pipe 23 and the sludge discharge branch pipe 3; the first electric valve 31 is intermittently opened by automatic program control, such as opening for 5 minutes and closing for 12 hours.

[0032] Sludge reflux: The biological treatment system needs to maintain a certain biological abundance, that is, sludge concentration, and also requires a certain proportion of sludge reflux. The wastewater return lift pump 1 returns the sedimentation tank sludge to the anaerobic tank through the second electric valve 41 opened on the reflux main pipe 23 and the sludge reflux branch pipe 4; the second electric valve 41 is intermittently opened by automatic program control, such as opening for 10 minutes and closing for 6 hours.

[0033] Nitrified liquid reflux: The denitrification of the wastewater biological treatment system requires the nitrified liquid generated by the aerobic nitrification process to be refluxed to the anoxic tank for anoxic denitrification. The wastewater return lift pump 1 refluxes the nitrified liquid from the sedimentation tank to the anaerobic tank through the third electric valve 51 opened on the reflux main pipe 23 and the nitrified liquid reflux branch pipe 5; the third electric valve 51 is intermittently opened by automatic program control, such as opening for 30 minutes and closing for 6 hours.

[0034] Aerobic pool defoaming: The foam in the aerobic pool is generated by pollutants such as organic matter, ammonia nitrogen, and surfactants in the wastewater during the biochemical aeration process. As the aeration time goes by, the foam gradually diffuses and rises. The wastewater reflux lift pump 1 sprays the clarified wastewater after regular sludge discharge and sludge return from the sedimentation tank through the reflux main pipe 23 and the manual valve 61 opened on the spray branch pipe 6 through a uniform and dense micro-pore spraying method on the foaming interface of the aerobic pool to achieve defoaming. The spray water spray distance and water pressure can be adjusted through the opening of the manual valve according to the foam situation. After adjustment, the manual valve remains open. The spray defoaming is carried out except for the time when sludge discharge, sludge return, and nitrification liquid return are opened at a scheduled time. Because the spray branch pipe is reduced in diameter and perforated relative to the main pipe and other branches, it does not affect the automatic switching of the device from the spray state to the working state of sludge discharge, sludge return, and nitrification liquid return.

[0035] The utility model discloses a wastewater reflux device with integrated defoaming function, which realizes simple and efficient integration of foam suppression and elimination, sludge reflux, nitrification liquid reflux and residual sludge discharge in a wastewater biological treatment system biochemical pool by applying the time and space separation principle.

Claims

1. A wastewater reflux device with integrated defoaming function, characterized in that: It includes a wastewater reflux lifting pump and a reflux pipe system, wherein the reflux pipe system is connected to the wastewater reflux lifting pump outlet flange through a first flange; the reflux pipe system includes a reflux main pipe and a sludge discharge branch pipe, a sludge reflux branch pipe, a nitrification liquid reflux branch pipe, and a spray branch pipe, which are directly connected to the reflux main pipe through pipe fittings.

2. A wastewater reflux device with integrated defoaming function according to claim 1, characterized in that: The first flange outlet of the return pipeline system is installed with a ball check valve, and the wastewater return lift pump is a flange-connected submersible pump.

3. A wastewater reflux device with integrated defoaming function according to claim 1, characterized in that: The sludge discharge branch pipe is installed in a clamp-type manner through the second flange, the first electric valve, and the third flange, and is led out from the return main pipe with equal diameter; the sludge return branch pipe is installed in a clamp-type manner through the fourth flange, the second electric valve, and the fifth flange, and is led out from the return main pipe with equal diameter; the nitrification liquid return branch pipe is installed in a clamp-type manner through the sixth flange, the third electric valve, and the seventh flange, and is led out from the return main pipe with equal diameter; the spray branch pipe is led out from the return main pipe with a reduced diameter through a manual valve arranged close to the return main pipe, and a pipe plug is used as the end of the spray branch pipe, and the spray branch pipe is provided with two rows of circular holes with equal spacing and apertures in the upper and lower directions from the manual valve outlet.

4. A wastewater reflux device with integrated defoaming function according to claim 3, characterized in that: The center lines of the upper and lower rows of equally spaced and equal-diameter circular holes form an angle of ±45 degrees with the horizontal plane of the center of the spray branch pipe, the horizontal spacing between the center lines of the upper and lower rows of equally spaced and equal-diameter circular holes is 200mm~300mm, and the diameter of the upper and lower rows of equally spaced and equal-diameter circular holes is 3~4mm.

5. A wastewater reflux device with integrated defoaming function according to claim 3, characterized in that: The length of the spray branch pipe, the number of openings and the number of the spray branch pipes are adapted according to the plane size of the aeration tank and the number of aeration tanks required for spray defoaming.

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