Continuous denitrification biological filter for deep denitrification

Abstract

The utility model discloses a continuous denitrification biofilter for deep denitrification, which comprises a filter body, two sides of the bottom of the filter body are respectively and fixedly connected with a filter material washing water inlet pipe and a water inlet pipe, a spiral device II is arranged above the filter material washing water inlet pipe and a sewage inlet pipe, and a spiral device I is arranged in the middle of the inside of the filter body. The partition wall is arranged in the tank body and close to the filter material inlet pipe, a filter material inlet pipe is arranged on one side, close to the spiral device II, of the partition wall, a water outlet pipe is arranged at the upper end of the tank wall on one side of the tank body, and the filter material is placed in the tank body. Compared with the prior art, the filter material has the advantages that the novel light filter material made of modified polystyrene is adopted, and compared with a common polystyrene filter material, the modified filter material has the advantages that the material characteristics of the filter material are improved, and the impact resistance of the filter material is improved; therefore, the filter material loss in the operation process of the filter tank is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a denitrification biological filter for deep denitrification. Background Art

[0002] The deep treatment of urban sewage is an effective way to reduce the nitrogen and phosphorus nutrient pollution load in water bodies. Among them, denitrifying biological filters are used for deep nitrogen treatment due to their small footprint, easy operation, convenient and flexible operation and management, and stable treatment effect. At present, they have been widely used in urban sewage treatment, community sewage treatment and reuse, industrial wastewater treatment, and micro-polluted surface water treatment in China, and are gradually becoming one of the important technical means in the field of sewage biological treatment in my country.

[0003] The selection of filter media is very critical and important for the biofilter process. Different types of filter media have different physical properties, such as specific surface area, particle size, porosity, density, etc. Nowadays, most researchers choose quartz sand or clay-fired ceramsite as the filter media for biofilters. This type of filter media has a rough surface and a large specific surface area, which is conducive to the attachment and growth of microorganisms. Therefore, the sewage can obtain better effluent quality after treatment. However, due to the small gaps between the filter media, the quartz sand filter media is prone to blockage. During the operation of the filter tank, the head loss increases rapidly, and the backwashing is more frequent and the operation cycle is shortened accordingly. The use of lightweight plastic balls produced from polystyrene polymer materials as filter media for biofilters has solved the problems caused by the use of traditional heavy filter media such as ceramsite to a certain extent. At the same time, the filler layer inside the denitrification filter can filter the suspended matter in the sewage, so that the concentration of suspended matter decreases. The denitrification filter can remove suspended matter in the sewage while performing deep denitrification. Utility Model Content

[0004] The purpose of the utility model is to provide a novel denitrification biofilter with lightweight filter media in view of the shortcomings of the existing biofilter media during operation, to enhance the impact resistance of the filter media, to efficiently remove nitrogen, to reduce backwashing power and water consumption, to increase water production rate, and to reduce system operation energy consumption and cost.

[0005] The purpose of the utility model can be achieved through the following technical scheme: a novel lightweight filter media denitrification biofilter, comprising a tank body, a spiral device 1, an outlet pipe, filter media, a partition wall, a filter washing media air inlet pipe, a spiral device 2, a filter washing media water inlet pipe and a water inlet pipe, the bottom sides of the tank body are respectively fixedly connected with a filter washing media water inlet pipe and a water inlet pipe, a spiral device 2 is arranged above the filter washing media water inlet pipe and the water inlet pipe, the spiral device 1 is arranged in the middle position of the tank body, the partition wall is arranged in the tank body close to the filter washing media water inlet pipe, the partition wall is provided with a filter washing media air inlet pipe on one side close to the spiral device 2, a water outlet pipe is arranged on the upper end of the tank wall on one side of the tank body, and the filter media is placed in the tank body.

[0006] Furthermore, the water outlet pipe, the filter washing material air inlet pipe, the filter washing material water inlet pipe and the water inlet pipe are all provided with a first control valve.

[0007] Furthermore, the filter material is lightweight polystyrene balls.

[0008] Compared with the prior art: the utility model adopts a new light filter material made of modified polystyrene. Compared with ordinary polystyrene filter material, the modified filter material improves the material properties of the filter material and improves the impact resistance of the filter material, thereby reducing the filter material loss during the operation of the filter tank. After using the modified polystyrene filter material of the utility model, after the biofilter is inoculated with seed mud and domesticated and cultivated, the denitrifying bacteria can successfully attach and grow on the light filter material, and a good denitrification effect can be achieved. In addition, during the backwashing process of the light filter material denitrification biofilter, the backwashing time and water volume are greatly reduced, which is conducive to reducing the energy consumption of backwashing and improving the water production rate of the denitrification biofilter, thereby reducing the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0010] Figure 1 This is a schematic diagram of the structure of the denitrification biological filter of the utility model;

[0011] The accompanying drawings are numerals in the figure: 1. pool body; 2. spiral device 1; 3. water outlet pipe; 4. water outlet valve; 5. filter material; 6. partition wall; 7. filter washing material air inlet valve; 8. filter washing material air inlet pipe; 9. spiral device 2; 10. filter washing material water inlet valve; 11. filter washing material water inlet pipe; 13. water inlet pipe. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0013] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0014] The embodiments of the present application provide a denitrification biological filter, which can mainly perform denitrification treatment and a certain degree of filtration treatment on sewage, and can be used in conjunction with other sewage treatment equipment.

[0015] See also Figure 1 The utility model provides a technical solution, a denitrification biological filter for deep denitrification, including a tank body 1, a spiral device 2, a water outlet pipe 3, filter material 5, a partition wall 6, a filter washing material inlet pipe 8, a spiral device 9, a filter washing material inlet pipe 11 and a water inlet pipe 13.

[0016] The pool body 1 is filled with lightweight filter material 5, an inlet pipe 13 is arranged below the filter material 5, and an outlet pipe 3 is arranged above the filter material 5. The filter material 5 is made of modified polystyrene filter material, the modified polystyrene filter material has an average particle size of 3.4-3.8mm, a bulk density of 40-50kg / m3, a porosity of 0.4, and a specific surface area greater than 4000m2 / m3.

[0017] When the filter material 5 is used, an artificial enhanced biofilm formation method is adopted to form a biofilm on the surface of the filter material 5, even if the specific surface area, hydrophilicity and surface charge of the filter material 5 are changed, it is easier for microorganisms to adhere to the surface of the filler, increase the hydrophilicity of the filler, and improve the biofilm formation speed. A water inlet pipe 13 and a partition wall 6 are arranged at the bottom of the pool body 1, and a spiral device 2 is arranged above the partition wall 6. The filter material 5 is covered above the spiral device 2 as a reaction zone. A partition wall 6 is arranged on one side of the inside of the pool body 1, and a filter material washing area is arranged on the right side of the partition wall 6. The filter washing material air inlet pipe 8 and the filter washing material water inlet pipe 11 are below the zone, a channel is arranged on the top, and extends to the left, and then extends downward to communicate with the reaction zone, and is provided with a spiral device 2, a partition is arranged above the pool body 1, above the partition is the clean water zone, and a water outlet pipe is arranged on the left. The utility model has high denitrification efficiency and low operating cost, and solves the problems of easy clogging, high energy consumption and small biomass of conventional denitrification deep bed filters. At the same time, the filter washing material area is arranged to enable the filter material to be continuously cleaned, and continuous filtration can be realized without stopping for backwashing.

[0018] Combined with the accompanying drawings, the method of using the utility model is as follows: open valve 12, sewage enters the filter tank through the water inlet pipe 13, open the water outlet pipe 3 to allow the filter tank to operate normally, the sewage enters the filter tank, the water level rises, and is fully mixed with the filter material and then discharged from the water outlet pipe 3, valve 7, valve 10 and spiral device 2 9 and spiral device 1 2 are opened at the same time to clean the filter material;

[0019] The water inlet process and the backwash process are two processes. The water inlet process is that the sewage passes through the water distribution area, the filter material reaction area, and the clean water area from bottom to top. The backwash process adopts the countercurrent water-gas alternating backwash technology, which can effectively remove suspended solids and aged biofilms. The air wash has the advantages of low intensity, low energy consumption, and no need for a backwash water pump; the water wash has a more thorough effect, which is reflected in the fact that the pollutants are discharged to the bottom by gravity with the backwash water flow, and the cleaning effect is better.

[0020] Different from the traditional denitrifying biological filter, the denitrifying biological filter of the embodiment of the present application can remove nitrogen in the sewage through the nitrification and denitrification effect of the biofilm on the surface of the filter material, and at the same time, the tightly compressed filter layer will have an interception effect to remove suspended matter in the sewage.

[0021] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A continuous denitrification biofilter for deep denitrification, characterized in that: The invention comprises a pool body (1), a spiral device 1 (2), a water outlet pipe (3), filter material (5), a partition wall (6), a filter washing material air inlet pipe (8), a spiral device 2 (9), a filter washing material water inlet pipe (11) and a water inlet pipe (13), wherein the filter washing material water inlet pipe (11) and the water inlet pipe (13) are respectively fixedly connected to the two sides of the bottom of the pool body (1), the spiral device 2 (9) is arranged above the filter washing material water inlet pipe (11) and the water inlet pipe (13), the spiral device 1 (2) is arranged at a middle position in the pool body, the partition wall is arranged in the pool body close to the filter washing material water inlet pipe, the filter washing material air inlet pipe (8) is arranged on the side of the partition wall (6) close to the spiral device 2 (9), the water outlet pipe (3) is arranged on the upper end of the pool wall on one side of the pool body (1), and the filter material (5) is placed in the pool body.

2. A continuous denitrification biofilter for deep denitrification according to claim 1, characterized in that: The water outlet pipe (3), the filter washing material air inlet pipe (8), the filter washing material water inlet pipe (11) and the water inlet pipe (13) are all provided with a first control valve.

3. A continuous denitrification biofilter for deep denitrification according to claim 1, characterized in that: The filter material (5) is a lightweight polystyrene ball.

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