Filler, carbon source feeding device and application for carbon source feeding

Abstract

The application provides a filler for carbon source addition, a carbon source addition device and application, and relates to the technical field of sewage treatment. The filler for carbon source addition comprises a central pipe and a carrier arranged on the central pipe. One end of the central pipe is closed, the inside is hollow, and a slow-release hole is arranged on the side wall of the pipe for slow release of the carbon source. The other end of the central pipe is open for inflow of the carbon source. The carrier is used for adhesion and growth of microorganisms. The filler can ensure adhesion and growth of microorganisms and realize reverse denitrification treatment of sewage. The slow-release hole on the central pipe can slowly release the carbon source required for biological denitrification to the surface of the biological membrane reverse denitrification bacteria, so that the carbon source is first used for denitrification by the nitrification bacteria, a small amount of carbon source that cannot be used in time enters the water body or the activated sludge and is secondarily used by microorganisms, the loss of excess carbon source is avoided, the carbon source addition amount is closer to the theoretical calculation value, and the carbon source addition in the operation process of the sewage treatment facility is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and in particular to a filler for carbon source addition, a carbon source addition device and application. BACKGROUND

[0002] Biological denitrification in sewage is mainly through nitrification reaction in the aerobic tank to oxidize ammonia nitrogen into nitrate nitrogen or nitrite nitrogen, and then through denitrification reaction in the anoxic tank or anaerobic tank to convert nitrate nitrogen or nitrite nitrogen into nitrogen gas by using carbon source to achieve total nitrogen TN removal. During the operation of sewage treatment facilities, a large amount of carbon source needs to be added due to insufficient C / N of the influent. In order to ensure that the total nitrogen of the effluent meets the standard, the amount of carbon source added by most sewage treatment facilities is more than the actual demand, resulting in waste of chemicals. Especially for the biological membrane process for treating sewage, the main force is the microorganisms attached to the filler. The traditional method of adding carbon source is to directly add carbon source to the end of the aerobic tank or the front end of the anoxic tank, and the carbon source dosage is optimized and calculated through carbon source addition control program, but this method still causes a large amount of carbon source to not fully contact the biofilm on the filler and enter the next treatment unit, resulting in waste of carbon source and increasing the COD removal pressure of the subsequent biochemical unit.

[0003] In view of this, the present application is proposed. SUMMARY

[0004] The first object of the present application is to provide a filler for carbon source addition to solve at least one of the above problems.

[0005] The second object of the present application is to provide a carbon source addition device.

[0006] The third object of the present application is to provide the application of the above filler or carbon source addition device in sewage denitrification treatment.

[0007] The fourth object of the present application is to provide a carbon source addition method.

[0008] The fifth object of the present application is to provide a denitrification treatment tank.

[0009] In the first aspect, the present application provides a filler for carbon source addition, comprising a central pipe and a carrier arranged on the central pipe.

[0010] The central pipe is closed at one end and hollow inside, and the side wall of the pipe is provided with slow-release holes for slow release of carbon source; the other end of the central pipe is open for inflow of carbon source.

[0011] The carrier is used for attachment and growth of microorganisms.

[0012] As a further technical solution, the slow-release holes are plugged with porous water-permeable materials.

[0013] The porous water-permeable material comprises at least one of non-woven fabric, PP or PE.

[0014] As a further technical solution, the carrier is arranged at the position of the slow-release hole.

[0015] As a further technical solution, the filler is mainly improved by at least one of combined filler, biological rope, elastic filler and flat plate filler.

[0016] The central rope of the combined filler is replaced by the central pipe.

[0017] The central rope of the biological rope is replaced by the central pipe.

[0018] The central rope of the elastic filler is replaced by the central pipe.

[0019] The central pipe is arranged between adjacent flat plate fillers.

[0020] In a second aspect, the present application provides a carbon source feeding device, comprising a feeding pump and the filler.

[0021] The feeding pump and the central pipe of the filler are in communication.

[0022] As a further technical solution, the main pipe and branch pipe are further included.

[0023] The feeding pump, the main pipe, the branch pipe and the central pipe of the filler are in communication in sequence.

[0024] As a further technical solution, the pressure transmitter is arranged on the main pipe, for controlling the start and stop of the feeding pump.

[0025] In a third aspect, the present application provides the application of the above filler or carbon source feeding device in sewage denitrification treatment.

[0026] In a fourth aspect, the present application provides a carbon source feeding method, which adopts the carbon source feeding device, pumps the carbon source to the filler by the feeding pump, and then flows out from the slow-release hole.

[0027] In a fifth aspect, the present application provides a denitrification treatment tank, comprising the filler or the carbon source feeding device.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The filler for carbon source addition provided by the application can ensure the adhesion and growth of microorganisms, realize the denitrification treatment of sewage, and release the carbon source needed for biological denitrification to the surface of the biofilm denitrification bacteria through the slow-release holes on the central pipe, so that the carbon source is first used for denitrification by nitrifying bacteria, and the few carbon sources that cannot be used in time enter the water body or activated sludge and are used by microorganisms for the second time, without causing the loss of excess carbon source, ensuring that the carbon source addition amount is closer to the theoretical calculation value, and reducing the carbon source addition during the operation of the sewage treatment facility. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 Front view of the combined filler for carbon source addition;

[0032] Figure 2 Side view of the combined filler for carbon source addition;

[0033] Figure 3 Front view of the biological rope for carbon source addition;

[0034] Figure 4 Side view of the biological rope for carbon source addition;

[0035] Figure 5 Front view of the elastic filler for carbon source addition;

[0036] Figure 6 Side view of the elastic filler for carbon source addition;

[0037] Figure 7 Front view of the flat plate filler for carbon source addition;

[0038] Figure 8 Side view of the flat plate filler for carbon source addition.

[0039] Figure legend: 1-dosing pump; 2-main pipe; 3-branch pipe; 4-quick connector; 5-central pipe; 6-slow-release hole; 7-porous water-permeable material; 8-combined filler; 9-elastic filler; 10-biological rope; 11-flat plate filler; 12-pressure transmitter. DETAILED DESCRIPTION

[0040] The embodiments of the present application will be described in detail below with reference to the embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the examples in the present application, all other examples obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application. If the specific conditions are not specified, the conventional conditions or the conditions recommended by the manufacturer are used. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased on the market.

[0041] In a first aspect, the present application provides a filler for carbon source addition, comprising a central pipe and a carrier arranged on the central pipe.

[0042] The central pipe is closed at one end and hollow inside, and the side wall of the pipe is provided with slow-release holes for slow release of the carbon source; the other end of the central pipe is open for inflow of the carbon source.

[0043] The carrier is used for attachment and growth of microorganisms.

[0044] It should be noted that the "central pipe" in the present application refers to a pipe usually located at the center of the filler, hence the name central pipe. The central pipe can be a flexible pipe or a rigid pipe.

[0045] The present application does not make specific limitations on the material and size of the central pipe and the carrier. For example, the material of the central pipe can be PP, PE, HDPE, etc., the inner diameter can be 0.5-9 mm, and the outer diameter can be 1-10 mm; the material of the carrier can be any material known to those skilled in the art that can be used for microbial attachment and growth. In the present application, the spacing between the slow-release holes can be set according to actual needs, for example, the spacing between the slow-release holes can be 10-30 cm.

[0046] The filler for carbon source addition provided by the present application can ensure the attachment and growth of microorganisms and achieve denitrification treatment of wastewater, while the slow-release holes on the central pipe can slowly release the carbon source needed for biological denitrification to the surface of the biofilm denitrification bacteria, so that the carbon source is first utilized for denitrification by the nitrifying bacteria, and a small amount of carbon source that cannot be utilized in time enters the water body or activated sludge and is utilized by microorganisms for the second time, without causing loss of excess carbon source, ensuring that the carbon source addition amount is closer to the theoretical calculation value, and reducing the carbon source addition during operation of the wastewater treatment facility.

[0047] In some preferred embodiments, the slow-release holes are plugged with porous water-permeable materials to better achieve slow release of the carbon source.

[0048] The porous water-permeable material includes but is not limited to non-woven fabric, PP or PE, or other materials known to those skilled in the art that have a slow-release effect.

[0049] In some preferred embodiments, the carrier is arranged at the position of the slow-release hole.

[0050] Arranging the carrier at the position of the slow-release hole is advantageous for the biofilm on the carrier to utilize the carbon source released from the slow-release hole for the first time, thereby improving the utilization rate of the carbon source.

[0051] In some preferred embodiments, the filler is mainly improved by at least one of the following: a combined filler, a bio-rope, an elastic filler, and a flat plate filler.

[0052] The central rope of the combined filler is replaced by the central pipe;

[0053] The central rope of the bio-rope is replaced by the central pipe;

[0054] The central rope of the elastic filler is replaced by the central pipe;

[0055] The central pipe is arranged between adjacent flat plate fillers, for example, the central pipe is arranged between two flat plate fillers and then needle-punched and sewn to complete the arrangement.

[0056] The filler of the present application can be obtained by improving the existing filler, for example, the core filler support structure of the combined filler, the bio-rope, the elastic filler, and the flat plate filler is replaced by the central pipe of the present application, and the carrier part still uses the carrier provided by the combined filler, the bio-rope, the elastic filler, and the flat plate filler.

[0057] In a second aspect, the present application provides a carbon source feeding device, which comprises a dosing pump and the filler; the dosing pump and the open end of the central pipe of the filler are in communication.

[0058] The dosing pump is used to pump the carbon source to the filler, so that the carbon source flows out from the slow-release hole of the filler.

[0059] The carbon source feeding device provided by the present application is simple and has a high utilization rate of carbon source.

[0060] In some preferred embodiments, the main pipe and the branch pipe are further included.

[0061] The dosing pump, the main pipe, the branch pipe, and the central pipe of the filler are in communication in sequence.

[0062] The material and size of the main pipe and the branch pipe are not specifically limited in the present application and can be selected according to the actual situation, for example, the material of the main pipe and the branch pipe can be PP, PE, or HDPE; the inner diameter of the main pipe can be 10-30 mm, and the outer diameter can be 11-32 mm; the inner diameter of the branch pipe can be 5-15 mm, and the outer diameter can be 6-16 mm.

[0063] Through the design of the main pipe and the branch pipe, the carbon source feeding device can be connected in parallel with more fillers.

[0064] In some preferred embodiments, a pressure transmitter is arranged on the main pipe to control the start and stop of the dosing pump.

[0065] The carbon source is added by the dosing pump controlled by the main pipe pressure signal, and the carbon source is distributed to the surface of the microorganisms attached to the filler through the slow-release holes of the center pipe of each center pipe through the main pipe and branch pipe.

[0066] In some preferred embodiments, the pressure transmitter measures the pipe pressure in the range of 0-2Mpa, and the pressure signal controls the start and stop of the dosing pump, and the carbon source is pumped into the sewage treatment system by maintaining the pressure in the carbon source dosing main pipe in a certain range of 0-2Mpa.

[0067] In a third aspect, the present application provides the use of the above-mentioned filler or carbon source dosing device in sewage denitrification treatment.

[0068] The filler or carbon source dosing device provided by the present application can slowly release the carbon source needed for biological denitrification to the surface of the biofilm denitrification bacteria, has high carbon source utilization rate, is used for denitrification treatment of sewage, and is beneficial to reducing the cost of denitrification treatment.

[0069] In a fourth aspect, the present application provides a carbon source dosing method, which uses the carbon source dosing device to pump the carbon source to the filler by the dosing pump and then flow out from the slow-release holes.

[0070] The method provided by the present application is simple and convenient, and has high carbon source utilization rate.

[0071] In a fifth aspect, the present application provides a denitrification treatment tank comprising the filler or the carbon source dosing device.

[0072] The denitrification treatment tank has high carbon source utilization rate and low sewage treatment cost.

[0073] The present application will be further described below through specific examples and comparative examples, but it should be understood that these examples are only for more detailed description and should not be understood as limiting the present application in any form.

[0074] Example 1

[0075] A filler for carbon source dosing, as shown in Figure 1 and Figure 2 is obtained by replacing the center rope of the combined filler 8 with a center pipe 5. The slow-release holes 6 are arranged on the side wall of the center pipe 5 at the position of each piece of combined filler 8, the slow-release holes 6 have a hole diameter of 1mm, the slow-release holes 6 are sealed by using the porous water-permeable material 7 made of non-woven fabric, and each slow-release hole 6 is spaced by 15cm; the center pipe 5 is made of PP, the center pipe 5 is hollow inside, one end is closed, one end is open, the inner diameter is 1.5mm, and the outer diameter is 2mm.

[0076] Embodiment 2

[0077] A filler for carbon source addition, as shown in Figure 3 and Figure 4 , is obtained by replacing the central rope of the bio-rope 10 with a central tube 5. The side wall of the central tube 5 is provided with slow-release holes 6 with a diameter of 2 mm, which are blocked with porous water-permeable material 7 made of non-woven fabric, and each slow-release hole 6 is spaced 20 cm apart. The central tube 5 is made of PE, is hollow inside, is closed at one end and open at the other end, has an inner diameter of 2 mm and an outer diameter of 2.5 mm.

[0078] Embodiment 3

[0079] A filler for carbon source addition, as shown in Figure 5 and Figure 6 , is obtained by replacing the central rope of the elastic filler 9 with a central tube 5. The side wall of the central tube 5 is provided with slow-release holes 6 with a diameter of 1.5 mm, which are blocked with porous water-permeable material 7 made of PP, and each slow-release hole 6 is spaced 30 cm apart. The central tube 5 is made of HDPE, is hollow inside, is closed at one end and open at the other end, has an inner diameter of 9 mm and an outer diameter of 10 mm.

[0080] Embodiment 4

[0081] A filler for carbon source addition, as shown in Figure 7 and Figure 8 , comprises a central tube 5 and a flat plate filler 11, and is completed by needle stitching after arranging the central tube 5 between the two layers of flat plate fillers 11. The central tubes 5 are arranged in parallel, the side wall is provided with a plurality of slow-release holes 6 with a diameter of 1 mm, which are blocked with porous water-permeable material 7 made of non-woven fabric, and each slow-release hole 6 is spaced 10 cm apart. The central tube 5 is made of PP, is hollow inside, is closed at one end and open at the other end, has an inner diameter of 1 mm and an outer diameter of 1.5 mm.

[0082] Embodiment 5

[0083] A carbon source addition device, as shown in Figure 1 and Figure 2 , comprises the filler provided in Embodiment 1, a dosing pump 1, a main pipe 2 and branch pipes 3. The open ends of the central tubes 5 of the filler are in communication with the branch pipes 3, one end of the branch pipes 3 is connected to the main pipe 2 through a quick connector 4, the other end of the main pipe 2 is in communication with the dosing pump 1, and the branch pipes 3 and the main pipe 2 are made of PP, the branch pipes 3 have an inner diameter of 6 mm and an outer diameter of 7 mm, and the main pipe 2 has an inner diameter of 10 mm and an outer diameter of 11 mm.

[0084] In addition, the main pipe 2 is also provided with a pressure transmitter 12 for controlling the start and stop of the dosing pump 1.

[0085] Example 6

[0086] A carbon source dosing device, as shown in Figure 3 and Figure 4 , comprises the packing provided in Example 2, a dosing pump 1, a main pipe 2 and branch pipes 3. The open ends of the central pipes 5 of the packing are in communication with the branch pipes 3, one end of the branch pipes 3 is connected to the main pipe 2 through a quick connector 4, the other end of the main pipe 2 is in communication with the dosing pump 1, the material of the branch pipes 3 is PE, the inner diameter of the branch pipes 3 is 10 mm and the outer diameter is 11 mm, the material of the main pipe 2 is PP, the inner diameter of the main pipe 2 is 15 mm and the outer diameter is 16 mm;

[0087] In addition, a pressure transmitter 12 is arranged on the main pipe 2 for controlling the start and stop of the dosing pump 1.

[0088] Example 7

[0089] A carbon source dosing device, as shown in Figure 5 and Figure 6 , comprises the packing provided in Example 3, a dosing pump 1, a main pipe 2 and branch pipes 3. The open ends of the central pipes 5 of the packing are in communication with the branch pipes 3, one end of the branch pipes 3 is connected to the main pipe 2 through a quick connector 4, the other end of the main pipe 2 is in communication with the dosing pump 1, the material of the branch pipes 3 and the main pipe 2 is HDPE, the inner diameter of the branch pipes 3 is 15 mm and the outer diameter is 16 mm, the inner diameter of the main pipe 2 is 30 mm and the outer diameter is 32 mm;

[0090] In addition, a pressure transmitter 12 is arranged on the main pipe 2 for controlling the start and stop of the dosing pump 1.

[0091] Example 8

[0092] A carbon source dosing device, as shown in Figure 7 and Figure 8 , comprises the packing provided in Example 4, a dosing pump 1, a main pipe 2 and branch pipes 3. The open ends of the central pipes 5 of the packing are in communication with the branch pipes 3, one end of the branch pipes 3 is connected to the main pipe 2 through a quick connector 4, the other end of the main pipe 2 is in communication with the dosing pump 1, the material of the branch pipes 3 and the main pipe 2 is PP, the inner diameter of the branch pipes 3 is 8 mm and the outer diameter is 9 mm, the inner diameter of the main pipe 2 is 12 mm and the outer diameter is 13 mm;

[0093] In addition, a pressure transmitter 12 is arranged on the main pipe 2 for controlling the start and stop of the dosing pump 1.

[0094] Test Example 1

[0095] A rural integrated sewage treatment station handles 200 tons of water per day. The process of the treatment station is A2O (anaerobic, anoxic, aerobic) + secondary sedimentation tank. The total nitrogen concentration of the effluent of the treatment station is 15 mg / L, and the COD concentration of the effluent is 50 mg / L. Sodium acetate is used as a carbon source in the treatment station, and the COD equivalent of sodium acetate is 0.78 mg COD / mg sodium acetate. Since the COD concentration of the influent is 120 mg / L, the BOD5 concentration is 72 mg / L, and the total nitrogen concentration of the influent is 42 mg / L, the C / N is insufficient. In order to stabilize the total nitrogen of the effluent to meet the standard, 20.2 kg of sodium acetate needs to be added every day. In order to reduce the daily consumption of chemicals, the carbon source dosing device provided in Example 5 is used, and about 10 m 3 of the improved combined filler are placed in the anoxic tank of the system to replace the original filler. The pressure parameter of the dosing pump is selected to be 0.2 MPa, and the pressure of the carbon source dosing main pipe is controlled to be 0.1-0.15 MPa. The pressure transmitter collects the pressure signal of the carbon source dosing main pipe and transmits it to the PLC of the treatment station to control the start and stop of the dosing pump. When the pressure is less than 0.1 MPa, the dosing pump is started to supplement the carbon source. When the pressure is higher than 0.15 MPa, the dosing pump is stopped to supplement the carbon source. After the stable operation of the system after the modification, only 4.65 kg of sodium acetate needs to be added every day, saving 15.55 kg of sodium acetate every day, and the total nitrogen of the effluent can be stabilized to meet the standard, and the COD concentration of the effluent can be reduced to below 45 mg / L.

[0096] Test Example 2

[0097] A municipal sewage treatment plant handles 10,000 tons of water per day. The process of the treatment station is multi-stage AO (anoxic, aerobic, anoxic, aerobic) + secondary sedimentation tank. The total nitrogen concentration of the effluent of the treatment plant is 15 mg / L, and the COD concentration of the effluent is 50 mg / L. Methanol is used as a carbon source in the treatment plant, and the COD equivalent of methanol is 1.5 mg COD / mg methanol. Since the COD concentration of the influent is 145 mg / L, the BOD5 concentration is 87 mg / L, and the total nitrogen concentration of the influent is 45 mg / L, the C / N is insufficient. In order to stabilize the total nitrogen of the effluent to meet the standard, 587 kg of methanol needs to be added every day. In order to reduce the daily consumption of chemicals, the carbon source dosing device provided in Example 6 is used, and about 1500 m 3The fillers of the original material are replaced in the system anoxic tank, the pressure parameter of the dosing pump is selected as 2Mpa, the measurement range of the carbon source dosing main pipe pressure transmitter is 0-2Mpa, which is installed on the carbon source dosing main pipe, the carbon source dosing main pipe pressure is controlled at 0.3-0.5Mpa, the pressure transmitter collects the pressure signal of the dosing main pipe and transmits to the treatment station PLC to control the start and stop of the dosing pump, when the pressure is less than 0.3Mpa, the dosing pump is started to supplement the carbon source, when the pressure is higher than 0.5Mpa, the dosing pump is stopped to supplement the carbon source. After the system is stable after the transformation, only 120kg of methanol needs to be supplemented every day, 467kg of methanol is saved every day, the total nitrogen of the effluent can reach the standard, and the COD concentration of the effluent can reach below 46mg / L.

[0098] Test Example 3

[0099] The water treatment capacity of an industrial wastewater treatment plant is 5000 tons / day, the process of the treatment station is multi-stage AO (anoxic, aerobic, anoxic, aerobic) + secondary sedimentation tank + high-efficiency sedimentation tank + advanced oxidation, the total nitrogen concentration of the effluent of the treatment station is 15mg / L, the COD concentration of the effluent is 50mg / L, the treatment plant uses glucose as the carbon source, the COD equivalent of methanol is 1.066mg COD / mg glucose; since the COD concentration of the influent is 200mg / L, the BOD5 concentration is 80mg / L, and the total nitrogen concentration of the influent is 60mg / L, the C / N is insufficient, in order to stabilize the total nitrogen of the effluent to reach the standard, 680.1kg of glucose needs to be supplemented every day. In order to reduce the daily drug consumption, the carbon source dosing device provided in Example 8 is used, about 900m 2 The fillers of the original material are replaced in the system anoxic tank, the pressure parameter of the dosing pump is selected as 2Mpa, the measurement range of the carbon source dosing main pipe pressure transmitter is 0-2Mpa, which is installed on the carbon source dosing main pipe, the carbon source dosing main pipe pressure is controlled at 0.3-0.5Mpa, the pressure transmitter collects the pressure signal of the dosing main pipe and transmits to the treatment station PLC to control the start and stop of the dosing pump, when the pressure is less than 0.3Mpa, the dosing pump is started to supplement the carbon source, when the pressure is higher than 0.5Mpa, the dosing pump is stopped to supplement the carbon source. After the system is stable after the transformation, only 120kg of methanol needs to be supplemented every day, 467kg of methanol is saved every day, the total nitrogen of the effluent can reach the standard, and the COD concentration of the effluent can reach below 46mg / L.

[0100] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A filler for carbon source dosing, characterized by, The filler comprises a central pipe and a carrier arranged on the central pipe. The central pipe is closed at one end and hollow inside, and the side wall of the pipe is provided with slow-release holes for slow release of the carbon source; the other end of the central pipe is open for inflow of the carbon source. The carrier is used for adhesion and growth of microorganisms. The slow-release holes are blocked by porous water-permeable materials. The carrier is arranged at the position of the slow-release holes. The filler is mainly improved by at least one of a combination filler, a biological rope, an elastic filler and a flat plate filler. The central rope of the combination filler is replaced by the central pipe. The central rope of the biological rope is replaced by the central pipe. The central rope of the elastic filler is replaced by the central pipe. The central pipe is arranged between adjacent flat plate fillers.

2. The filler of claim 1, wherein The porous water-permeable material comprises at least one of non-woven fabric, PP or PE.

3. A carbon source feeding device characterized by, The filler comprises a dosing pump and the filler of claim 1 or 2. The open end of the central pipe of the dosing pump and the filler is in communication.

4. The carbon source dosing apparatus according to claim 3, characterized by The filler further comprises a main pipe and a branch pipe. The dosing pump, the main pipe, the branch pipe and the central pipe of the filler are in communication in sequence.

5. The carbon source dosing apparatus according to claim 4, characterized by A pressure transmitter is arranged on the main pipe for controlling start and stop of the dosing pump.

6. Application of the filler of claim 1 or 2 or the carbon source dosing device of any one of claims 3-5 in wastewater denitrification treatment.

7. A carbon source feeding method characterized by, The carbon source dosing device of any one of claims 3-5 is used to pump the carbon source to the filler by the dosing pump, and then the carbon source flows out from the slow-release holes.

8. A denitrification treatment tank characterized by comprising: The filler of claim 1 or 2 or the carbon source dosing device of any one of claims 3-5 is used.

Images