CN216711705U

CN216711705U - Low carbon nitrogen ratio sewage removes total nitrogen biomembrane carousel device

Info

Publication number: CN216711705U
Application number: CN202123234413.0U
Authority: CN
Inventors: 王卫; 曹宁; 刘彬; 商文秀; 王亚东; 芦艳平; 果长军; 余正学
Original assignee: Beijing Xincheng Yulu Environmental Protection Technology Co ltd
Current assignee: Beijing Xincheng Yulu Environmental Protection Technology Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-06-10
Anticipated expiration: 2031-12-21

Abstract

The utility model provides a rotating disc device for removing total nitrogen from sewage with low carbon-nitrogen ratio, which comprises: the biological rotating disc type sewage treatment device comprises a contact reaction tank, a plurality of biological rotating discs, a rotating shaft and an aerator pipe, wherein the rotating shaft penetrates through the center of each biological rotating disc and drives the biological rotating discs to rotate, the aerator pipe is arranged at the bottom of the contact reaction tank, sewage is filled in the contact reaction tank, and one part of each biological rotating disc is immersed in the sewage. The turntable of the utility model can form autotrophic denitrogenation bacteria biofilm culturing; the denitrification efficiency is improved; the floor area is saved; the film forming performance is good.

Description

Low carbon nitrogen ratio sewage removes total nitrogen biomembrane carousel device

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to a rotating disc device for removing total nitrogen from sewage with a low carbon-nitrogen ratio.

Background

With the rapid development of industrial and agricultural production and the accelerated urbanization process, domestic sewage, industrial wastewater and farmland surface water runoff containing high-concentration nitrogen and phosphorus substances are merged into lakes, reservoirs and rivers, so that the mass propagation of plants such as algae and the like causes the eutrophication of water bodies. In order to prevent the sewage treatment plant from receiving eutrophic water, the national government and all levels of governments have strict discharge standards for total nitrogen discharged by sewage treatment. Therefore, the denitrification of municipal sewage is a research focus of sewage treatment nowadays. The denitrification treatment in the prior art mainly comprises the following steps: synchronous nitrification and denitrification, short-cut nitrification and denitrification, anaerobic ammonia oxidation and the like.

Carbon-nitrogen ratio: refers to the ratio of the total carbon content to the total nitrogen content of the organic material. Generally expressed as "C/N" or "C: N". Biological rotating disk: the biological rotating disc process is one kind of biological film process for treating sewage and strengthening irrigation and land treatment, and the said treating process makes micro matter, such as microbe, protozoan, of bacteria and fungi grow and breed on the carrier of biological rotating disc to form film biological sludge-biomembrane. The traditional biological rotating disk can only adopt a mode of increasing the disk area for increasing the contact time of organisms and air due to multi-contact air, so that the occupied area of the biological rotating disk device is larger, and the application of the biological rotating disk device to a large-scale municipal sewage treatment plant is limited. The prior domestic biological rotating disk technology has the defects of small specific surface area, poor film hanging and removing performance, low treatment efficiency, large occupied area and the like. In the process of sewage treatment with low carbon-nitrogen ratio, in order to ensure that the total nitrogen of effluent reaches the standard and is discharged, a large amount of external carbon sources are required to be added as an organic matrix of denitrification reaction, so that the cost of sewage treatment is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a rotating disc device for removing total nitrogen from sewage with low carbon-nitrogen ratio by using a biological film aiming at the defects of the prior art.

The technical problem to be solved by the utility model is realized by the following technical scheme:

a low carbon nitrogen ratio sewage removes total nitrogen biomembrane carousel device includes: the biological rotating disc type sewage treatment device comprises a contact reaction tank, a plurality of biological rotating discs, a rotating shaft and an aerator pipe, wherein the rotating shaft penetrates through the center of each biological rotating disc and drives the biological rotating discs to rotate, the aerator pipe is arranged at the bottom of the contact reaction tank, sewage is filled in the contact reaction tank, and one part of each biological rotating disc is immersed in the sewage.

Further, the contact reaction tank is welded by steel plates or made of reinforced concrete.

Further, the number of the plurality of biological rotating discs is at least 2; 20-40% of the area of each biological rotating disc is immersed in the sewage in the contact reaction tank, and the other part of the biological rotating disc is exposed in the air.

Further, the biological rotating disc is in the shape of a flat plate, a concave-convex plate, a corrugated plate, a honeycomb, a reticular plate or a combined plate; the combination plate is a combination of the shapes of the flat plate, the concave-convex plate, the corrugated plate, the honeycomb and the reticular plate, and the outer edge of the biological rotating disk is in a reticular shape, a polygonal shape or a cylindrical shape.

Furthermore, the diameter of the biological rotating disk is 2-3 m, and the thickness of the biological rotating disk is 1-15 mm.

Furthermore, the material of the biological rotating disk is polypropylene, polyethylene, polyvinyl chloride, polystyrene or unsaturated resin (glass fiber reinforced plastics).

Furthermore, the distance between every two biological rotating disks is 30mm, the distance between every two biological rotating disks at the water inlet end of the contact reaction tank is 25-35 mm, and the distance between every two biological rotating disks at the water outlet end of the contact reaction tank is 10-20 mm.

Further, the aeration pipe is arranged at the position 200mm away from the bottom of the biological rotating disc immersed in the sewage, and the electromagnetic valve is installed on the aeration pipe.

Further, a sludge discharge device, an emptying pipe and a valve are arranged in the contact reaction tank; the mud discharging device discharges accumulated mud in the reaction tank at regular intervals, the emptying pipe empties water in the reaction tank when being convenient to overhaul, and the water inlet pipeline can be closed by the valve. And a water inlet pipe and a water outlet pipe are respectively arranged on two sides of the contact reaction tank.

Furthermore, the center of the rotating shaft is higher than the sewage surface in the contact reaction tank by at least 150mm, and the rotating shaft is driven by a driving device to rotate by a speed reduction transmission device, wherein the rotating speed of the rotating shaft is 0.8 r/min-3.0 r/min.

The utility model has the beneficial effects that: increasing autotrophic denitrogenation bacteria biofilm formation; the denitrification efficiency is improved; the occupied area is saved; the film forming performance is good.

Drawings

FIG. 1 is a schematic structural diagram of a rotating disc device for removing total nitrogen from sewage with a low carbon-nitrogen ratio.

FIG. 2 is a top view of the rotating disk device for removing total nitrogen from sewage with low carbon-nitrogen ratio.

In the figure, 1-a contact reaction tank, 2-a biological rotating disk, 3-a rotating shaft and 4-an aeration pipe

Detailed Description

The utility model provides a rotating disc device for removing total nitrogen from sewage with low carbon-nitrogen ratio, which comprises: the biological rotating disc type sewage treatment device comprises a contact reaction tank 1, a plurality of biological rotating discs 2, a rotating shaft 3 and an aerator pipe 4, wherein the rotating shaft 3 penetrates through the center of each biological rotating disc 2 and drives the biological rotating discs 2 to rotate, the aerator pipe 4 is arranged at the bottom of the contact reaction tank 1, sewage is filled in the contact reaction tank 1, and a part of each biological rotating disc 2 is immersed in the sewage. Specifically, the number of the plurality of biological rotating discs is at least 2; 20-40% of the area of each biological rotating disk 2 is immersed in the sewage in the contact reaction tank 1, and the other part is exposed in the air. The contact reaction tank is welded by steel plates or made of reinforced concrete. The biological rotating disc is in the shape of a flat plate, a concave-convex plate, a corrugated plate, a honeycomb, a reticular plate or a combined plate, and the outer edge of the biological rotating disc is in the shape of a net, a polygon or a cylinder.

Specifically, each biological rotating disk 2 is composed of a plurality of biological rotating disks connected in series, fixed on a rotating shaft 3 and rotating along with the rotating shaft 3, and the requirements on the material of the biological rotating disks are light weight, high strength, corrosion resistance, easy processing and low price. The diameter of the biological rotating disk is generally 2-3 m, and the thickness of the disk is 1-15 mm. The materials of the turntable commonly used at present comprise polypropylene, polyethylene, polyvinyl chloride, polystyrene, unsaturated resin glass fiber reinforced plastic and the like. The distance between the disks of the turntable must be a certain distance to ensure the ventilation effect of the center part of the turntable, and the distance between the standard disks is 30mm, and can be specifically adjusted according to the process requirement. The distance between every two biological rotating discs at the water inlet end of the contact reaction tank is 25-35 mm, and the distance between every two biological rotating discs at the water outlet end of the contact reaction tank is 10-20 mm.

The contact reaction tank 1 is a semicircle basically matched with the biological rotating disk 2 in shape, a sludge discharge device 11, a vent pipe 12 and a valve 13 are arranged in the contact reaction tank, and a water inlet device 14 and a water outlet device 15 are respectively arranged on two sides of the contact reaction tank. The water inlet equipment and the water outlet equipment are triangular weirs.

As shown in figure 2, for a plurality of rotating discs of the biological rotating disc grade, the contact reaction tank is divided into a plurality of grids, and diversion trenches are arranged among the grids. The large oxidation tank is generally made of reinforced concrete, and the small and medium oxidation tanks are welded by using steel plates.

The rotating shaft 3 is an important part for supporting the disc body and driving the disc body to rotate, and two ends of the rotating shaft 3 are fixedly arranged on the supports at two ends of the contact reaction tank. Generally, a solid steel shaft or a seamless steel pipe is adopted, and the length of the solid steel shaft or the seamless steel pipe is controlled to be 0.5-7.0 m. The rotating shaft cannot be too long, otherwise, the rotating shaft is easy to distort and deform due to poor concentricity processing, and is easy to be worn off or twisted off.

The center of the rotating shaft 3 is higher than the sewage surface in the contact reaction tank by at least 150mm, and about 20-40% of the area of the rotating disc is immersed in the sewage in the tank. Under the driving of the motor, the rotating shaft is driven by the speed reduction transmission device to rotate slowly, and the rotating speed is generally 0.8-3.0 r/min.

The driving device comprises a power device and a speed reducing device. The power equipment is divided into electric mechanical transmission, air transmission, hydraulic transmission and the like, and the electric mechanical transmission or the air transmission is adopted in China mostly. The electromechanical transmission takes a motor as power and uses chain transmission or direct transmission. For a large turntable, a set of driving device is generally arranged on one turntable; for medium and small turntables, a set of (3-4-level) turntables can be driven by a set of driving device to work. The air transmission also has the function of oxygenation. The power consumption is saved.

The working principle is as follows:

the biological rotating disc is used to replace fixed filtering material, and during operation, the rotating disc is immersed or partially immersed in oxidizing tank filled with sewage and driven by the driver to rotate continuously. The rotating disc is alternately contacted with sewage and air, and after a period of rotation, a layer of biological film is attached to the disc. When the wastewater is transferred into the wastewater, the biological membrane adsorbs organic pollutants in the wastewater, and absorbs dissolved oxygen in a water film outside the biological membrane to decompose organic matters, so that microorganisms can reproduce per se in the process; when the rotary disc is rotated out of the oxidation tank, the rotary disc is contacted with air, and the air is continuously dissolved into the water film to increase the dissolved oxygen. In the process, besides the transfer of organic substances (BOD, COD) and O2, other substances such as CO2, NH3 and the like are transferred between the biological membrane attached to the rotating disc and the sewage and the air, so that a continuous process of adsorption, oxidative decomposition, oxygen absorption and total nitrogen removal is formed, and the sewage is continuously purified.

Organic nitrogen, protein and the like in the sewage are firstly converted into ammonia nitrogen by ammonifying bacteria under an aerobic condition, then are converted into nitrate nitrogen under the action of nitrifying bacteria, and then are reduced into nitrogen to escape from the sewage under the action of denitrifying bacteria under an anoxic condition by the energy provided by an external carbon source.

Because the total nitrogen removal process of the sewage with low carbon nitrogen ratio requires two processes of aerobic nitrification and anoxic denitrification, the contact time of the rotary table and air is short, the aerobic nitrification process is incomplete, and the denitrification effect is not obvious in the traditional biological rotary table, an aeration pipe 4 is arranged at the position of about 200mm of the bottom of the rotary table, an electromagnetic valve is arranged on the aeration pipe, and the aeration pipe is intermittently opened according to the total nitrogen removal effect so as to increase the oxygen uptake of microorganisms attached to the rotary table. Thereby achieving good total nitrogen removal effect.

On the other hand, in order to increase the contact time between the organisms and the air by contacting the air more, the traditional biological rotating disk only can adopt a mode of increasing the disk to increase the area, so that the occupied area of the biological rotating disk device is larger, and the application is limited. The aeration pipe is arranged at the bottom of the biological rotating disk, and the oxygen uptake of microorganisms attached to the rotating disk is increased, so that the total nitrogen removal effect is improved.

The technical solution of the present invention is explained in detail above. It is obvious that the utility model is not limited to the above description and that many changes may be made by those skilled in the art, which changes are equivalent or similar to the utility model and fall within the protective scope of the utility model.

Claims

1. The utility model provides a low carbon nitrogen ratio sewage removes total nitrogen biomembrane carousel device which characterized in that includes: the biological rotating disc type sewage treatment device comprises a contact reaction tank, a plurality of biological rotating discs, a rotating shaft and an aeration pipe, wherein the rotating shaft penetrates through the center of each biological rotating disc and drives the biological rotating discs to rotate, the aeration pipe is arranged at the bottom of the contact reaction tank, sewage is filled in the contact reaction tank, and part of each biological rotating disc is immersed in the sewage.

2. The rotating disk device for removing total nitrogen from low-carbon-nitrogen-ratio sewage of claim 1, wherein the contact reaction tank is welded by steel plates or made of reinforced concrete.

3. The low carbon-nitrogen ratio wastewater total nitrogen biofilm removal rotating disk device of claim 1, wherein the number of the plurality of rotating disks is at least 2; 20-40% of the area of each biological rotating disc is immersed in the sewage in the contact reaction tank, and the other part of the biological rotating disc is exposed in the air.

4. The biofilm removal rotating disk device for removing total nitrogen from low-carbon-nitrogen-ratio sewage of claim 1, wherein the rotating disk is in the shape of a flat plate, a corrugated plate, a honeycomb, a net-shaped plate or a combined plate; the combination plate is a combination of the shapes of the flat plate, the concave-convex plate, the corrugated plate, the honeycomb and the reticular plate, and the outer edge of the biological rotating disk is in a reticular shape, a polygonal shape or a cylindrical shape.

5. The biofilm removal rotating disk device for removing total nitrogen from sewage with low carbon-nitrogen ratio as claimed in claim 1, wherein the diameter of the rotating disk is 2 m-3 m, and the thickness of the rotating disk is 1 mm-15 mm.

6. The apparatus according to claim 1, wherein the bio-disc is made of polypropylene, polyethylene, polyvinyl chloride, polystyrene or unsaturated resin.

7. The apparatus according to claim 5, wherein the distance between every two biological rotating discs is about 30 mm; the distance between every two biological rotating discs at the water inlet end of the contact reaction tank is 25-35 mm, and the distance between every two biological rotating discs at the water outlet end of the contact reaction tank is 10-20 mm.

8. The rotating disc device for removing total nitrogen from low carbon-nitrogen ratio sewage of claim 1, wherein the aerator pipe is arranged at the bottom 200mm of the rotating disc immersed in the sewage, and the electromagnetic valve is arranged on the aerator pipe.

9. The rotating disc device for removing total nitrogen from low-carbon-nitrogen-ratio sewage according to claim 1, wherein a sludge discharge device, an emptying pipe and a valve are arranged in the contact reaction tank; and a water inlet pipe and a water outlet pipe are respectively arranged on two sides of the contact reaction tank.

10. The rotating disc device for removing total nitrogen from sewage with low carbon-nitrogen ratio of claim 1, wherein the center of the rotating shaft is at least 150mm higher than the sewage surface in the contact reaction tank, and the rotating speed of the rotating shaft is 0.8r/min to 3.0 r/min.