CN217972752U - Biological denitrification reactor with synchronous softening function - Google Patents
Biological denitrification reactor with synchronous softening function Download PDFInfo
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- CN217972752U CN217972752U CN202222155893.XU CN202222155893U CN217972752U CN 217972752 U CN217972752 U CN 217972752U CN 202222155893 U CN202222155893 U CN 202222155893U CN 217972752 U CN217972752 U CN 217972752U
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Abstract
The utility model discloses a biological denitrification reactor with synchronous softening function, which relates to the technical field of sewage treatment. The utility model discloses a biological denitrification reactor with synchronous softening function, the upper part of which is a straight-wall cylinder, the lower part of which is a tapered sludge bucket, the upper part of the straight-wall cylinder is provided with a first water outlet, the middle upper part of the straight-wall cylinder is provided with a first water inlet and an organic sludge return port, the lower part of the straight-wall cylinder is provided with an aeration inlet and a crystal nucleus feeding port, and the bottom of the sludge bucket is provided with an inorganic sludge discharge port; the straight-walled cylinder is internally provided with a central reactionThe lower end in the central reaction cylinder is provided with an aeration device which is connected with an aeration inlet through an aeration pipeline; the interior of the central reaction cylinder is connected with a crystal nucleus feeding port through a crystal nucleus feeding pipe. The biological denitrification reactor of the utility model is to contain high-concentration Ca 2+ The nitrate wastewater is treated, synchronous biological denitrification and hardness removal are realized in one reactor, and softening and hardness removal do not influence the biological denitrification.
Description
Technical Field
The utility model relates to a sewage treatment technical field especially relates to a biological denitrification reactor with function is softened in step.
Background
In the production process of the stainless steel processing plant, hydrofluoric acid and nitric acid are adopted to carry out acid pickling on the surface of the steel plate, and high-concentration mixed acid wastewater is discharged. The main pollutants in the wastewater comprise heavy metal ions, fluoride ions and nitrate, and are usually treated by combining pH neutralization, calcium salt precipitation defluorination and biological denitrification processes. In order to obtain better defluorination effect, excessive Ca content is added in a precipitation defluorination working section 2+ Chemical agents of (2), e.g. Ca (OH) 2 Or CaCl 2 The feed water of the biological denitrification section contains a large amount of non-precipitated dissolved Ca 2+ 。
Alkalinity (HCO) formation due to biological denitrification 3 - ) And HCO 3 - With Ca in the feed water 2+ Simultaneous formation of insoluble CaCO 3 Inorganic CaCO 3 Are entrained with the organic sludge in the reactor, are difficult to separate, and gradually accumulate. The conditions can lead to high inorganic content of denitrifying sludge, low sludge activity, unstable biological denitrification effect and poor impact performance of resisting concentration fluctuation of influent nitrate in the reactor. In addition, in the actual engineering operation, in order to solve the problems of high inorganic content and low organic content in the denitrification sludge, the sludge discharge amount of the biological denitrification reactor needs to be increased, and activated sludge (such as municipal sewage plant sludge) with high organic content needs to be supplemented frequently so as to maintain the concentration of the activated sludge in the reactor. But such operations add significantly to the operational maintenance workload and operating costs.
Chinese patent CN103351087A discloses a nitric acid solution containing high concentrationA process for denitrifying and purifying the waste water containing root ions includes such steps as softening the waste water, removing hardness, and anoxic denitrifying 2+ The influence on the biological denitrification process. Because sodium carbonate softening agent is added in the process of removing hardness, the operation cost is higher.
Chinese patent No. 103359890A discloses a purification method of steel pickling wastewater after neutralization and precipitation treatment, wherein part of effluent of an anoxic tank flows back to a mixed flocculation tank, and the alkalinity generated by denitrification is utilized for softening and hardness removal, so that the dosage of sodium carbonate softening agent added in the hardness removal process is reduced. Because the softening and hardness removal and the biological denitrification in the process are two different reaction sections and reflux needs to be set, the reactor occupies a larger area and has higher operation energy consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a biological denitrification reactor with function is softened in step to containing high concentration Ca 2+ The nitrate wastewater is treated, synchronous biological denitrification and hardness removal are realized in one reactor, and softening and hardness removal do not influence the biological denitrification.
In order to realize the purpose of the utility model, the utility model provides a biological denitrification reactor with synchronous softening function, the appearance is a cylindrical reactor with a cone bucket, the upper part of the reactor is a straight-wall cylinder, the lower part of the reactor is a tapered sludge bucket, the upper part of the straight-wall cylinder is provided with a first water outlet, the middle upper part of the straight-wall cylinder is provided with a first water inlet and an organic sludge return port, the lower part of the straight-wall cylinder is provided with an aeration inlet and a crystal nucleus feeding port, and the bottom of the sludge bucket is provided with an inorganic sludge outlet;
a central reaction cylinder is arranged in the straight-wall cylinder, an aeration device is arranged at the lower end in the central reaction cylinder, and the aeration device is connected with the aeration inlet through an aeration pipeline;
the interior of the central reaction cylinder is connected with the crystal nucleus feeding port through a crystal nucleus feeding pipe.
Furthermore, the height-diameter ratio of the straight-wall cylinder is 2.5-4.5.
Furthermore, the included angle between the side wall of the sludge hopper and the horizontal plane is 50-55 degrees.
Furthermore, the height-diameter ratio of the central reaction cylinder is 5-8.
Further, the diameter ratio of the central reaction cylinder to the straight-wall cylinder is 1: (2.5-4).
Furthermore, the aeration device is a perforated aeration pipe, and the diameter of an opening is 2-5 mm.
Further, the utility model provides a biological denitrification reactor with function is softened in step is still including vertical flow sedimentation tank, first delivery port pass through the pipeline with vertical flow sedimentation tank's second water inlet is connected, vertical flow sedimentation tank's upper portion is provided with the second delivery port, vertical flow sedimentation tank's toper bottom is provided with the mud discharging mouth.
The utility model discloses following beneficial effect has been gained:
1. the utility model discloses central reaction cylinder's setting is divided into denitrification reaction district (central reaction cylinder outside region) and is softened except that hard reaction district (central reaction cylinder inside region) with reactor inside to realize synchronous biological denitrogenation and remove hard in a reactor, and soften and remove hard process and not exert an influence to biological denitrogenation.
2. The aeration device in the central reaction cylinder promotes airflow through aeration to promote the muddy water mixed liquor to circularly flow in the denitrification reaction zone and the softening and hardness-removing reaction zone, so that the wastewater can be quickly diluted by the circulating liquid after entering the reactor, and the impact of the concentration fluctuation of the wastewater on the denitrification sludge is reduced; aeration can also be promoted to be blown off with gas, and the reactor is applied to the reactor containing high-concentration Ca 2+ The denitrification treatment of nitrate wastewater is Ca in the inlet water 2+ And HCO generated by the denitrification process 3 - Reaction to form CaCO 3 Creates favorable conditions, can accelerate the softening reaction process and improve the softening and hardness removal effects.
3. The crystal nucleus adding port is arranged, and softened crystal nuclei can be added into the central reaction cylinder to ensure that insoluble CaCO generated by softening reaction 3 Attached to the surface of the crystal nucleus, rather than remaining inIn the denitrification sludge, the activity of the denitrification sludge is influenced, and the denitrification capability is improved.
4. The utility model reduces the hydraulic retention time of the reactor, improves the total nitrogen treatment volume load, enhances the impact resistance of the reactor to the water inlet concentration and saves the treatment cost; for Ca in the inlet water 2+ And NO 3 - Has better synchronous removal effect due to the Ca in the effluent 2+ The concentration is low, which is beneficial to further advanced treatment and recycling of the rear end, such as reverse osmosis desalination and recycling.
Drawings
FIG. 1 is a schematic structural diagram of example 1 of a biological denitrification reactor of the present invention;
FIG. 2 is a schematic diagram showing the structure of example 2 of the biological denitrification reactor of the present invention.
Reference numerals: 1. a straight-walled cylinder; 2. a sludge hopper; 3. a central reaction barrel; 4. an aeration device; 5. a vertical flow sedimentation tank; 6. a first water inlet; 7. a first water outlet; 8. an organic sludge return port; 9. a crystal nucleus feeding port; 10. an aeration inlet; 11. an inorganic sludge discharge port; 12. a second water inlet; 13. a second water outlet; 14. a sludge discharge port.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The scope of the present application is to be considered as defined by the appended claims.
The present application will be described in further detail below with reference to the accompanying drawings, but the present application is not limited thereto.
Example 1
As shown in fig. 1, the biological denitrification reactor with synchronous softening function according to the embodiment of the present invention is a cylindrical reactor with a cone bucket in appearance, the upper part of the reactor is a straight-walled cylinder 1, and the height-diameter ratio of the straight-walled cylinder 1 is 2.5-4.5; the lower part is a conical sludge hopper 2, the bottom of the sludge hopper 2 is provided with an inorganic sludge outlet 11, and the included angle between the side wall of the sludge hopper 2 and the horizontal plane is 50-55 degrees, so that the inorganic sludge can be conveniently discharged; the diameter ratio of the central reaction cylinder 3 to the straight-wall cylinder 1 is 1: (2.5-4), chemical softening reaction mainly occurs in the central reaction cylinder, biological denitrification reaction mainly occurs in the outer area of the reaction cylinder, the chemical softening reaction speed is high, and the required reaction volume is small; in addition, the height and diameter of the central reaction cylinder are large, which is beneficial to aeration and lifting of water flow.
As shown in fig. 1, the upper part of the straight-wall cylinder 1 is provided with a first water outlet 7 for the muddy water mixed liquid to flow out from the upper part; the well upper portion of straight wall drum 1 is provided with first water inlet 6 and organic sludge return port 8, and this first water inlet 6 is used for flowing into the denitrification reaction district (central reaction section of thick bamboo 3 outside region I district) in the reactor with pending waste water from this place, and this organic sludge return port 8 is used for passing through the sludge pump with the denitrification mud after handling and flows back to again the utility model discloses an continue the reaction in the reactor.
As shown in figure 1, a central reaction cylinder 3 is arranged in a straight-wall cylinder 1, an aeration device 4 is arranged at the lower end in the central reaction cylinder 3, the aeration device 4 is a perforated aeration pipe, the diameter of the opening is 2-5 mm, an aeration inlet 10 is arranged at the lower part of the straight-wall cylinder 1, and the aeration device 4 is connected with the aeration inlet 10 through an aeration pipeline. The aeration device 4 is used for filling air into the reactor through an aeration inlet 10 through an aeration pipeline, so that wastewater liquid in the softening and hardness-removing reaction zone (the zone II in the inner area of the central reaction cylinder 3) is in contact with the air for oxygenation, and under the action of air flow lifting, muddy water mixed liquid at the lower part in the central reaction cylinder 3 flows upwards, flows out of the central reaction cylinder 3, diffuses around and enters the denitrification reaction zone. Meanwhile, under the action of air flow lifting, the sludge-water mixed liquid in the denitrification reaction zone flows into the central reaction cylinder 3 from the lower part, namely: the aeration and lifting are carried out through the central reaction cylinder 3, and mixed liquid in the I area and the II area is formed to flow circularly in the reactor.
The utility model discloses a biological denitrification reactor's processing object is through the mixed acid waste water after pH neutralization, calcium salt deposit defluorination processing, contains NO in the waste water 3 - And Ca 2+ . The wastewater to be treated flows into a denitrification reaction zone in the reactor from the first water inlet 6 and flows downwards under the push of circulating liquid. The mud-water mixed liquid in the denitrification reaction zone enters the softening and hardness removing zone in the central reaction cylinder 3 under the pushing of the circulating flow. By arranging aeration lifting and CO lifting in the central reaction cylinder 3 2 Blowing off creates favorable conditions for softening and removing hardness, can accelerate the softening reaction process and improve the softening and removing hardness effect.
As shown in figure 1, the lower part of the straight-wall cylinder 1 of the utility model is also provided with a crystal nucleus feeding port 9, and the central reaction cylinder 3 is internally connected with the crystal nucleus feeding port 9 through a crystal nucleus feeding pipe. Due to the insoluble CaCO generated in the central reaction cylinder 3 3 Can mix with denitrification sludge and be in the same place, can not solve the problem that contains a large amount of inorganic matters in the organic sludge, consequently, the utility model discloses a crystal nucleus is thrown with mouth 9 and is thrown with softening crystal nucleus toward central reaction cylinder 3 in, makes the insoluble CaCO that softening reaction produced 3 Adhere to the surface of the softened crystal nucleus to form large-size granular insoluble substances. Under the action of air lift, the insoluble substances circulate between the denitrification reaction zone and the softening and hardness-removing zone along with the mixed liquor, and the size and specific gravity of the granular insoluble substances are increased. Insoluble matters having a large specific gravity flow into the sludge hopper 2 at the lower part of the reactor and are periodically discharged through the inorganic sludge discharge port 11. Through the design of the crystal nucleus feeding port 9, most of inorganic matters generated by softening and hardness removal can be separated from the denitrification sludge, namely the softening and hardness removal can not influence the biological denitrification process.
Example 2
As shown in fig. 2, the biological denitrification reactor with synchronous softening function according to the embodiment of the present invention is a cylindrical reactor with a cone bucket in appearance, the upper part of the reactor is a straight-walled cylinder 1, and the height-diameter ratio of the straight-walled cylinder 1 is 2.5-4.5; the lower part is a conical sludge hopper 2, the bottom of the sludge hopper 2 is provided with an inorganic sludge outlet 11, and the included angle between the side wall of the sludge hopper 2 and the horizontal plane is 50-55 degrees; the diameter ratio of the central reaction cylinder 3 to the straight-wall cylinder 1 is 1: (2.5-4).
As shown in fig. 2, the upper part of the straight-wall cylinder 1 is provided with a first water outlet 7 for the muddy water mixed liquid to flow out from the upper part; the middle upper part of the straight-walled cylinder 1 is provided with a first water inlet 6 and an organic sludge return port 8, and the first water inlet 6 is used for flowing the wastewater to be treated into a denitrification reaction zone (zone I outside the central reaction cylinder 3) in the reactor. The inner part of the straight-wall cylinder 1 is provided with a central reaction cylinder 3, the lower end of the inner part of the central reaction cylinder 3 is provided with an aeration device 4, the aeration device 4 is a perforated aeration pipe, the diameter of the opening is 2-5 mm, the lower part of the straight-wall cylinder 1 is provided with an aeration inlet 10, and the aeration device 4 is connected with the aeration inlet 10 through an aeration pipeline. The lower part of the straight-wall cylinder 1 is also provided with a crystal nucleus feeding port 9, and the interior of the central reaction cylinder 3 is connected with the crystal nucleus feeding port 9 through a crystal nucleus feeding pipe.
As shown in figure 2, the utility model discloses a biological denitrification reactor is still including vertical sedimentation tank 5, and first delivery port 7 passes through the pipeline to be connected with vertical sedimentation tank 5's second water inlet 12, and muddy water mixed liquid in the biological denitrification reactor flows out from first delivery port 7 to carry out mud-water separation in flowing into vertical sedimentation tank 5 from second water inlet 12 through the pipeline. A second water outlet 13 is arranged at the upper part of the vertical sedimentation tank 5, so that the supernatant in the sedimentation tank flows out from the second water outlet 13; a sludge discharge port 14 is arranged at the conical bottom of the vertical sedimentation tank 5, one part of denitrification sludge in the conical part (also called a sludge bucket) of the sedimentation tank is discharged from the sludge discharge port 14 as residual sludge, the other part of denitrification sludge flows back to the I area of the biological denitrification reactor through an organic sludge return port 8 by a sludge pump to continue reaction, and the concentration of active sludge in the reactor can be kept through sludge return (otherwise, the active sludge flows away along with water).
The above-mentioned embodiments only express the specific implementation manner of the present invention, and the description thereof is specific and detailed, but not to be understood as the limitation of the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (7)
1. A biological denitrification reactor with a synchronous softening function is a cylindrical reactor with a conical hopper, the upper part of the reactor is a straight-wall cylinder (1), the lower part of the reactor is a conical sludge hopper (2), and the biological denitrification reactor is characterized in that a first water outlet (7) is arranged at the upper part of the straight-wall cylinder (1), a first water inlet (6) and an organic sludge return port (8) are arranged at the middle upper part of the straight-wall cylinder (1), an aeration inlet (10) and a crystal nucleus feeding port (9) are arranged at the lower part of the straight-wall cylinder (1), and an inorganic sludge outlet (11) is arranged at the bottom of the sludge hopper (2);
a central reaction cylinder (3) is arranged in the straight-wall cylinder (1), an aeration device (4) is arranged at the lower end in the central reaction cylinder (3), and the aeration device (4) is connected with the aeration inlet (10) through an aeration pipeline;
the interior of the central reaction cylinder (3) is connected with the crystal nucleus feeding port (9) through a crystal nucleus feeding pipe.
2. The biological denitrification reactor with synchronous softening function according to claim 1, wherein the ratio of height to diameter of the straight-walled cylinder (1) is 2.5-4.5.
3. The biological denitrification reactor with synchronous softening function according to claim 1, wherein the included angle between the side wall of the sludge hopper (2) and the horizontal plane is 50-55 degrees.
4. The biological denitrification reactor with synchronous softening function according to claim 1, wherein the height/diameter ratio of the central reaction cylinder (3) is 5 to 8.
5. The biological denitrification reactor with synchronous softening function according to claim 1, characterized in that the diameter ratio of the central reaction cylinder (3) to the straight-walled cylinder (1) is 1: (2.5-4).
6. The biological denitrification reactor with synchronous softening function according to claim 1, wherein the aeration device (4) is a perforated aeration pipe with the diameter of 2-5 mm.
7. The biological denitrification reactor with the synchronous softening function according to any one of claims 1 to 6, further comprising a vertical sedimentation tank (5), wherein the first water outlet (7) is connected with a second water inlet (12) of the vertical sedimentation tank (5) through a pipeline, a second water outlet (13) is arranged at the upper part of the vertical sedimentation tank (5), and a sludge discharge port (14) is arranged at the conical bottom of the vertical sedimentation tank (5).
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| CN202222155893.XU CN217972752U (en) | 2022-08-16 | 2022-08-16 | Biological denitrification reactor with synchronous softening function |
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| CN202222155893.XU CN217972752U (en) | 2022-08-16 | 2022-08-16 | Biological denitrification reactor with synchronous softening function |
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