Device for treating water body with low carbon nitrogen ratio and sewage treatment system

Abstract

The utility model provides a device for treating a water body with a low carbon nitrogen ratio and a sewage treatment system, the device for treating the water body with the low carbon nitrogen ratio is positioned in a sewage treatment reactor, an aeration pipe is arranged at the bottom of the sewage treatment reactor, the device for treating the water body with the low carbon nitrogen ratio comprises a plate body group and a rotating shaft connected with the plate body group, the plate body group comprises a plurality of plate bodies, the rotating shaft is used for connecting a motor, a plurality of connecting mechanisms are connected between the adjacent plate bodies, the connecting mechanisms are connected with a plurality of shells, a plurality of sulfur autotrophic particles are arranged in the shells, a plurality of groove bodies are formed in the shells, and the groove bodies penetrate through the shells. The sulfur autotrophic particles are arranged in the shell, so that autotrophic nitrogen removal without consuming a carbon source is completed on sewage, heterotrophic nitrogen removal occurs in a low-dissolved-oxygen-concentration area in the sewage treatment reactor, the nitrogen removal effect is greatly improved by combining the autotrophic nitrogen removal and the heterotrophic nitrogen removal, a few carbon sources are needed, the device for treating a low-carbon-nitrogen-ratio water body is low in cost, and a filter tank does not need to be independently built.

Description

Technical Field

[0001] The utility model relates to sewage treatment technology, in particular to a device for treating low carbon-nitrogen ratio water and a sewage treatment system. Background Art

[0002] In wastewater discharge, total nitrogen emission targets are becoming increasingly stringent, necessitating denitrification treatment. Nitrification converts ammonia nitrogen in wastewater into nitrites and nitrates, while denitrification converts nitrites and nitrates into nitrogen gas. Denitrification is based on the nitrification-denitrification theory, and the effectiveness of total nitrogen removal is correlated with the degree of nitrification and denitrification.

[0003] Existing sewage treatment plants generally have problems with low influent concentration and unbalanced carbon-nitrogen ratio. If sewage treatment plants use traditional nitrification and denitrification methods to remove nitrogen, they often need to add a large amount of carbon source, which increases the treatment cost significantly.

[0004] Sulfur autotrophic denitrification technology uses sulfur as an electron donor, reducing nitrate nitrogen to nitrogen gas without requiring a carbon source. This offers significant advantages in treating wastewater with a low carbon-nitrogen ratio. Currently, sulfur autotrophic denitrification technology is typically used in deep denitrification systems, requiring the construction of separate denitrification filters. This increases construction costs and floor space, making it costly and difficult to implement. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device for treating low carbon-nitrogen ratio water bodies and a sewage treatment system, aiming to solve the problem that the existing technology of introducing sulfur autotrophic denitrification technology to treat sewage requires the construction of a separate filter tank, which is difficult to implement and costly.

[0006] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0007] A device for treating water with a low carbon-nitrogen ratio, the device being located in a sewage treatment reactor, an aeration pipe being provided at the bottom of the sewage treatment reactor, the aeration pipe being used to supply oxygen to the sewage treatment reactor, the device comprising a plate group and a rotating shaft connected to the plate group, the plate group comprising a plurality of plates, the rotating shaft being used to connect to a motor, a plurality of connecting mechanisms being connected between adjacent plates, the connecting structures being connected to a plurality of shells, a plurality of sulfur autotrophic particles being provided in the shells, a plurality of troughs being provided on the shells, the troughs passing through the shells.

[0008] Compared with the prior art, the beneficial effect of the present invention is that: by setting the shell and setting a plurality of the sulfur autotrophic particles in the shell, the sulfur autotrophic denitrifying bacteria are gathered, the sulfur autotrophic particles are used to carry out the denitrification process, and the autotrophic denitrification is completed without consuming a carbon source. In addition to the sulfur autotrophic particles, a filler with gaps is added to the inside of the shell, and a substance exchange occurs with the plurality of the sulfur autotrophic particles. The substance in the sulfur autotrophic particles is used as a substrate to provide conditions for further enrichment of the sulfur autotrophic denitrifying bacteria. The activated sludge in the sewage treatment reactor contains nitrifying bacteria, which can use oxygen to carry out nitrification reaction to form nitrate nitrogen, and the activated sludge entering the shell Sludge particles with larger particle sizes in the mud help to form areas with different dissolved oxygen concentrations, forming aerobic, anoxic and anaerobic areas from the outside to the inside. In areas with low dissolved oxygen concentration, heterotrophic denitrifying bacteria use the carbon source in the sewage to reduce nitrate nitrogen to nitrogen gas, thereby realizing heterotrophic denitrification. The device for treating low carbon-nitrogen ratio water bodies greatly improves the denitrification effect of sewage; several of the shells are connected to several of the plates through the connecting mechanism. Under the drive of the motor, several of the shells rotate in the sewage, which can achieve better treatment effect. The device for treating low carbon-nitrogen ratio water bodies has low cost and does not require the construction of a separate treatment pool. Efficient denitrification can be achieved by using the existing sewage treatment reactor.

[0009] Furthermore, the particle size of the sulfur autotrophic particles is 5 mm to 10 mm.

[0010] Furthermore, a filling software is provided in the shell, and a plurality of gaps are provided in the filling software.

[0011] Furthermore, the width of the groove body is 1mm to 3mm.

[0012] Furthermore, the shell is spherical, and the diameter of the shell is 10 cm to 15 cm.

[0013] Furthermore, the connecting mechanism includes a first connecting belt, and two ends of the first connecting belt are respectively connected to the adjacent plates.

[0014] Furthermore, a plurality of second connecting belts are connected to the first connecting belt, and one end of the second connecting belt facing away from the first connecting belt is connected to the shell.

[0015] Furthermore, a plurality of pulleys are provided on the plate body adjacent to the aeration pipe.

[0016] A sewage treatment system comprises the device for treating low carbon-nitrogen ratio water as described in the above technical solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic structural diagram of a device for treating low carbon-nitrogen ratio water in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the shell of the device for treating low carbon-nitrogen ratio water in an embodiment of the present invention; description of the main component symbols:

[0019] shaft 100 First plate 110 Second plate 120 pulley 130 First connecting belt 200 Second connecting belt 210 case 300 trough 310

[0020] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] See also Figure 1 and Figure 2, the device for treating low-carbon-nitrogen ratio water in the embodiment of the present invention, the device for treating low-carbon-nitrogen ratio water is located in a sewage treatment reactor, the sewage treatment reactor contains activated sludge and sewage, an aeration pipe is arranged at the bottom of the reactor, the aeration pipe is used to supply oxygen to the sewage treatment reactor, the device for treating low-carbon-nitrogen ratio water includes a plate group and a rotating shaft 100 connected to the plate group, the plate group includes a plurality of plates, specifically, two plates are arranged in the plate group in this embodiment, namely a first plate 110 and a second plate 120, the second plate 120 is adjacent to the aeration pipe, one end of the rotating shaft 100 passes through the first plate 110, and the end of the rotating shaft 100 facing away from the first plate 110 is connected to the second plate 120, the rotating shaft 100 is used to connect to a motor, and a plurality of pulleys 130 are arranged on the side of the second plate 120 facing away from the first plate 110. Preferably, the aeration pipe is connected to a fan, and the fan transports air to the aeration pipe. A number of small holes are opened on the aeration pipe, and air enters the interior of the sewage treatment reactor through the small holes to supply oxygen to the interior. There is a mixture of sewage and activated sludge in the sewage treatment reactor. The first plate 110 and the second plate 120 are both circular plates with a diameter of 2m to 4m. Specifically, a circular plate with a diameter of 3m is selected. The pulley 130 abuts the bottom of the treatment tank. It can be understood that the pulley 130 is beneficial to reduce resistance when the device for treating low carbon-nitrogen ratio water rotates in the sewage treatment reactor.

[0025] Several connecting mechanisms are connected between adjacent plates. Specifically, several connecting mechanisms are connected between the first plate 110 and the second plate 120. The connecting structures connect several shells 300. The connecting mechanisms include a first connecting belt 200, with the first and second plates 110, 120 connected at both ends. Several second connecting belts 210 are connected to the first connecting belt 200, and the ends of the second connecting belts 210 facing away from the first connecting belt 200 are connected to the shells 300. Preferably, the first connecting belt 200 is an iron chain. The stirring speed of the low carbon-nitrogen ratio water treatment device driven by the motor is controlled within a range of 0.3 m / s to 0.5 m / s. It is understood that the motor drives the first and second plates 110, 120 to rotate, thereby driving the connecting mechanisms to rotate, causing the shells 300 to rotate accordingly, which is conducive to achieving better sewage treatment results. The first and second connecting belts 200, 210 are easy to replace and maintain.

[0026] The shell 300 is spherical, and the diameter of the shell 300 is 10cm to 15cm. A plurality of sulfur autotrophic particles are arranged in the shell 300, and the particle size of the sulfur autotrophic particles is 5mm to 10mm. A plurality of grooves 310 are arranged on the shell 300, and the grooves 310 pass through the shell 300. The width of the grooves 310 is 1mm to 3mm. Furthermore, a filling soft body is also arranged in the shell, and a plurality of gaps are arranged in the filling soft body. Preferably, the components of the sulfur autotrophic particles are sulfur, calcium carbonate, ferrous carbonate, etc., and sulfur autotrophic bacteria can be enriched on the sulfur autotrophic particles. The filling soft body is a polyurethane sponge, which is used to enhance the enrichment effect of the sulfur autotrophic bacteria. The packing density of the sulfur autotrophic particles is 100L / m 3 ~200L / m 3 Specifically, 100L / m 3 Density, the particle size of the sulfur autotrophic particles is selected to be 6 mm, the diameter of the shell 300 is selected to be 12 cm, the width of the tank body 310 is selected to be 2 mm, and a dissolved oxygen probe is set in the sewage treatment reactor to control the dissolved oxygen concentration. The concentration is always controlled at 0.7 mg / L to 1.5 mg / L. When the dissolved oxygen is within this concentration range, the nitrifying bacteria in the activated sludge in the sewage treatment reactor use the oxygen in the water to carry out nitrification reaction to generate nitrate nitrogen. At the same time, the sludge particles with larger particle size form an aerobic-anoxic-anaerobic dissolved oxygen environment from the outside to the inside. In the anoxic environment, the heterotrophic denitrifying bacteria use the carbon source in the sewage to reduce the nitrate nitrogen to nitrogen gas, realizing sewage heterotrophy. Denitrification, at the same time, a layer of biofilm is attached to the surface of the sulfur autotrophic particles, and sulfur autotrophic denitrifying bacteria are gathered in the biofilm. The sulfur autotrophic particles are used to carry out the denitrification process to complete autotrophic denitrification. The inner wall of the gap in the polyurethane sponge has a large specific surface area, and at the same time, material exchange occurs with the sulfur autotrophic particles. The material in the sulfur autotrophic particles is used as a substrate to provide conditions for further enrichment of sulfur autotrophic denitrifying bacteria. Furthermore, in the absence of carbon source and in the area of ​​low dissolved oxygen concentration, the activity of sulfur autotrophic denitrifying bacteria can be increased, so that the effect of removing nitrate nitrogen by sulfur is better, and the operator can adjust the dissolved oxygen concentration according to the water inlet conditions, thereby controlling the ratio of autotrophic denitrification and heterotrophic denitrification. It can be understood that a plurality of the trough bodies 310 are provided on the shell 300, so that the filling body inside can perform efficient denitrification treatment on the water body. Driven by the motor, the reaction is more sufficient and the filling body can be prevented from being blocked. The device for treating low carbon-nitrogen ratio water body is provided in the sewage treatment reactor. There is no need to build a separate treatment pool in the denitrification system, which saves a lot of costs, reduces the difficulty of construction, and the device is easy to maintain and update.

[0027] Furthermore, the total volume of the sulfur autotrophic particles filled in the shell 300 and the volume of the filling soft body were set to 1:1. Under the condition of influent COD / TN of 1.27, the dissolved oxygen concentration was kept at 0.7 mg / L~1.5 mg / L, and the denitrification performance experiment without adding an external carbon source was carried out to obtain the effluent COD, TN, NH4 + The average concentrations of -N were 12.31 mg / L, 10.20 mg / L and 0.16 mg / L, respectively, all reaching the Class A standard of the Pollutant Discharge Standard for Urban Wastewater Treatment Plants (GB18918-2002). Since no external carbon source was added and the influent COD concentration was low, the average concentration was 46.01 mg / L. It can be understood that sulfur autotrophic denitrification plays a major role in the denitrification process.

[0028] The present invention also provides a sewage treatment system comprising the apparatus for treating low carbon-nitrogen ratio water as described in the above embodiments. Preferably, an online pH meter and a sodium carbonate dosing pump are provided within the treatment tank where the sewage treatment reactor resides. When the pH value is less than 6.5, the sodium carbonate dosing pump is activated. The sewage treatment system also incorporates a secondary sedimentation tank for sludge separation.

[0029] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0030] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A device for treating low carbon-nitrogen ratio water, characterized in that: The device for treating water with a low carbon-nitrogen ratio is located in a sewage treatment reactor. An aeration pipe is provided at the bottom of the sewage treatment reactor. The aeration pipe is used to supply oxygen to the sewage treatment reactor. The device for treating water with a low carbon-nitrogen ratio includes a plate group and a rotating shaft connected to the plate group. The plate group includes a plurality of plates. The rotating shaft is used to connect a motor. A plurality of connecting mechanisms are connected between adjacent plates. The connecting mechanisms are connected to a plurality of shells. A plurality of sulfur autotrophic particles are provided in the shells. A plurality of troughs are provided on the shells. The troughs pass through the shells.

2. The device for treating low carbon-nitrogen ratio water according to claim 1, characterized in that: The particle size of the sulfur autotrophic particles is 5 mm to 10 mm.

3. The device for treating low carbon-nitrogen ratio water according to claim 1, characterized in that: A filling soft body is also provided in the shell, and a plurality of gaps are provided in the filling soft body.

4. The device for treating low carbon-nitrogen ratio water according to claim 1, characterized in that: The width of the groove body is 1mm to 3mm.

5. The device for treating low carbon-nitrogen ratio water according to claim 1, characterized in that: The shell is spherical, and the diameter of the shell is 10cm to 15cm.

6. The device for treating low carbon-nitrogen ratio water according to claim 1, characterized in that: The connecting mechanism includes a first connecting belt, and two ends of the first connecting belt are respectively connected to the adjacent plates.

7. The device for treating low carbon-nitrogen ratio water according to claim 6, characterized in that: A plurality of second connecting belts are connected to the first connecting belt, and one end of the second connecting belt facing away from the first connecting belt is connected to the shell.

8. The device for treating low carbon-nitrogen ratio water according to claim 1, characterized in that: A plurality of pulleys are arranged on the plate body adjacent to the aeration pipe.

9. A sewage treatment system, characterized in that: The invention comprises the device for treating low carbon-nitrogen ratio water as described in any one of claims 1 to 8.

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