CN111138046A - Rear denitrification and denitrification filter device based on depth upgrading and treatment process thereof - Google Patents
Rear denitrification and denitrification filter device based on depth upgrading and treatment process thereof Download PDFInfo
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- 238000011001 backwashing Methods 0.000 claims description 42
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 38
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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Abstract
The invention discloses a post denitrification denitrogenation filter device based on depth upgrading and a treatment process thereof, wherein the device is formed by sequentially connecting an internal water inlet pore plate grid, an aerobic nitrification biological filter, a denitrification deep bed V-shaped filter and a clean water tank in series; by adopting the method, the problem that the filter head of the traditional aerobic nitrification biological filter is easy to block due to fibrous impurities is solved; the problems that the traditional upflow denitrification filter has high operation pressure, a ceramsite filter material layer is easy to harden, and the SS of the effluent of the denitrification filter is difficult to be lower than 5mg/L and reaches the standard are solved; by utilizing the denitrification constant water level technology, the problem of drop level oxygenation of the denitrification deep bed V-shaped filter is solved, and a carbon source is greatly saved; the method can be used for upgrading the first-level A effluent or the first-level B effluent, ensures that the effluent economically and stably reaches the IV-class water standard of surface water environmental quality standard (GB3838-2002), and has great popularization and application values for upgrading the low-carbon-nitrogen-ratio sewage.
Description
Technical Field
The invention belongs to the technical field of water pollution treatment, and particularly relates to a post-denitrification filter device based on deep scaling and a treatment process thereof.
Background
At present, with the increasingly prominent water pollution problem in China, the improvement of the discharge standard of urban sewage treatment is great tendency. From the requirement of improving the quality of the current water environment, the effluent treated by a plurality of municipal sewage treatment plants is often discharged into a municipal river to become a water body of the river. The effluent of the existing sewage treatment plant in China has the discharge standard which is mainly referred to primary B or primary A in GB18918-2002 discharge Standard of pollutants for municipal wastewater treatment plants. However, for the class B or class A standard, the quality of water is only equivalent to the poor class V water of surface water. The water quality is discharged into the water body environment without self-purification capacity, so that the water body is not repaired but polluted, and the phenomenon of 'treating more and more dirty' occurs. The water pollution is increasingly aggravated, and the effluent of a sewage treatment plant is urgently required to reach the IV-class standard of the surface class.
At present, practice is carried out continuously all over the country, the requirements on CODCr, ammonia nitrogen, total phosphorus and the like of effluent of sewage plants are higher, and the existing IV-class water process is difficult to reach the full index standard practically; the prior treatment device and the prior treatment process mainly have the following problems: (1) traditionally, front-section fibrous substances of an upflow biological filter or PAC or PAM (polyaluminium chloride) remained in a pretreatment process are adhered to the surfaces of filter gaps of biological filter heads, biological membranes adhered to the surfaces block the filter gaps, forced backwashing of the filter heads is difficult to wash and remove, and then the filter heads are blocked, and finally the filter heads are paralyzed; (2) the SS of the effluent of a traditional upward flow aeration biological filter (including an aerobic biological filter and a denitrification biological filter) is generally 10-20 mg/L, and the SS of the effluent is difficult to reach below 5 mg/L; (3) the surface load of the traditional chemical phosphorus removal sedimentation tank is too low, and the occupied area is large; (4) in the traditional post-aerobic nitrification biological filter-anoxic denitrification biological filter group, the SS of the effluent can not reach the standard. At present, practice is carried out continuously all over the country, the requirements on CODCr, ammonia nitrogen, total phosphorus and the like of effluent of sewage plants are higher, and the existing IV-class water process is difficult to actually meet the IV-class water effluent index requirements. Therefore, a new technical solution needs to be developed to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems and provides a post denitrification denitrogenation filter device based on depth upgrading and a treatment process thereof so as to break through the problems encountered at present. The specific contents are as follows: the utility model provides a post denitrification denitrogenation filtering pond device based on mark is carried to degree of depth which characterized in that: the device is formed by sequentially connecting an inner water inlet hole plate grid, an aerobic nitrification biological filter, a denitrification deep bed V-shaped filter and a clean water tank in series; the upper water outlet of the aerobic nitrification biological filter is connected with a water distribution channel at the upper part of the denitrification deep bed V-shaped filter; the water outlet at the lower part of the denitrification deep bed V-shaped filter tank is connected with a clean water tank; a carbon source dosing system is arranged at the water inlet section of the denitrification deep bed V-shaped filter; the aerobic nitrification biological filter also comprises a back washing system and an aeration system; the denitrification deep bed V-shaped filter also comprises an air-water backwashing system, a surface sweeping system and a constant water level control system; the constant water level control system is formed by connecting a liquid level detector, an electric water outlet valve and a program automatic control system in the tank.
The aperture of the internal water inlet pore plate grid is not more than 1 mm.
The aerobic nitrification biological filter is composed of a water distribution area, a bearing layer, a ceramsite filter material reaction layer, a clear water area and a water outlet channel from bottom to top in sequence, wherein a long-handle filter head and a filter plate are arranged in the water distribution area, and the bearing layer and the ceramsite filter material reaction layer are arranged on the long-handle filter head and the filter plate.
The denitrification deep bed V-shaped filter tank sequentially comprises a water distribution area, a biological filter material reaction layer, a bearing layer, a collecting area, a water outlet pipe and an electric water outlet valve from top to bottom, wherein a short-handle filter head and a filter plate are arranged in the collecting area, and the bearing layer and the biological filter material reaction layer are arranged on the short-handle filter head and the filter plate.
The thickness of the ceramsite filter layer of the aerobic nitrification biological filter is 2.0-4.0 m, and the diameter of the ceramsite is 4-9 mm; the thickness of the biological filter material layer of the V-shaped filter of the denitrification deep bed is 1.5-2.0 m, and the diameter of the biological filter material is 1.5-3.5 mm.
The aeration system of the aerobic nitrification biological filter consists of a blower, an air pipeline, a regulating valve, an aerator and a dissolved oxygen instrument, and the backwashing system comprises a backwashing fan, a backwashing water pump, a water distribution pipeline and a gas distribution pipeline; the air blower, the back washing fan, the back washing water pump and the regulating valve are connected with the program automatic control system.
The aerobic nitrification biological filter is provided with an online flowmeter at the water inlet end, and a nitrate nitrogen and ammonia nitrogen multifunctional online monitoring instrument and a dissolved oxygen instrument are arranged in the aerobic nitrification biological filter.
A multifunctional online monitoring instrument for COD, nitrate nitrogen and total nitrogen is arranged in the water inlet end of the denitrification deep bed V-shaped filter.
A treatment process of a post-denitrification nitrogen removal filter device based on depth upgrading comprises the following treatment steps:
(1) the secondary biochemical effluent firstly passes through an inner water inlet pore plate grid to intercept all fibrous substances and impurities so as to prevent the fibrous substances from causing the blockage of a long-handle filter head at the bottom of a subsequent aerobic nitrification biological filter, and the treated effluent enters the aerobic nitrification biological filter;
(2) a large amount of obligate nitrification biomembranes grow on the surface of ceramsite in the aerobic nitrification biological filter, the biomembranes fully utilize dissolved oxygen generated by aeration of a blower to complete nitrification of all ammonia nitrogen (the ammonia nitrogen is less than 0.2mg/L), and the residual biochemical organic matters are removed; the program automatic control system controls an air blower according to the monitoring data of an online dissolved oxygen meter, the aeration rate supplied by the air blower just meets the operation requirement of the aerobic nitrification biological filter, the electricity consumption is saved to the maximum extent, the dissolved oxygen of the aerobic nitrification biological filter is 4-6 mg/L, the water inlet filtration speed is 2-15 m/h, the backwashing period is 24-72 h, the 'water level reduction + air water combination method' is adopted for backwashing, and the effluent treated by the aerobic nitrification biological filter automatically flows into the denitrification deep bed V-shaped filter;
(4) deep denitrification and deep removal of suspended matters are completed in the denitrification deep bed V-shaped filter; the program automatic control system automatically controls the optimal carbon source dosage according to the collected total nitrogen, nitrate nitrogen, COD and inflow flow data in the wastewater to be subjected to upgrading modification, the inflow filtering speed is 5-12 m/h, the opening degree of an electric outlet valve is automatically adjusted through a liquid level detector connected with the program automatic control system, the constant water level inflow is controlled, the drop oxygenation is prevented, and the additional consumption of an organic carbon source and the reduction of the denitrification effect are further caused; a large amount of denitrifying microbial membranes are attached to a biological filter material layer in a denitrifying deep bed V-shaped filter tank, deep denitrification is completed through denitrification (TN is less than 5mg/L), and meanwhile, the deep stable removal of suspended matters (SS is less than 5mg/L) is realized through the filtering and intercepting function of the biological filter material layer; backwashing by adopting a method of 'air washing → air washing + water washing → water washing + surface sweeping', wherein the backwashing period is 6-24 h, wherein the air washing is 70-100Nm/h, and the water washing is 15-25 m/h; the effluent of the denitrification deep bed V-shaped filter automatically flows to a clean water tank, and the effluent of the clean water tank is used as the final effluent of the system except for the required part of the effluent of the aerobic nitrification biological filter and the denitrification deep bed V-shaped filter.
The invention adopts a combined process of the internal water inlet pore plate grating, and solves the problem that the filter head of the traditional aerobic nitrification biological filter is easy to block due to fibrous impurities; the denitrification deep-bed V-shaped filter is adopted to replace the traditional upflow denitrification filter, so that the problems that the traditional upflow denitrification filter is high in operating pressure and easy to harden a ceramsite filter layer and the SS of the effluent of the denitrification filter is difficult to be lower than 5mg/L and reaches the standard are solved; by utilizing the denitrification constant water level technology, the problem of drop level oxygenation of the denitrification deep bed V-shaped filter is solved, and a carbon source is greatly saved; the dissolved oxygen in the secondary biochemical effluent is fully utilized, an automatic control system is utilized to realize accurate aeration of a blower and accurate addition of a carbon source medicament according to an online dissolved oxygen meter, total nitrogen, nitrate nitrogen, COD and flow monitoring data, the load impact resistance is stronger, the primary A effluent or the primary B effluent can be subjected to scaling, the effluent is ensured to economically and stably reach the IV-class water standard of the environmental quality standard of surface water (GB3838-2002), and the method has great popularization and application values for scaling of the low-carbon-nitrogen-ratio sewage.
Drawings
FIG. 1 is a process flow chart of a post denitrification nitrogen removal filter based on deep upgrading.
FIG. 2 is a schematic structural diagram of a post denitrification filter device based on depth upgrading.
Wherein: 1. an internal water inlet pore plate grid, 2, a water inlet pipeline, 3, an aerobic nitrification biological filter, 4, a water distribution area, 5, a supporting layer, 6, a ceramsite/biological filter material reaction layer, 7, a clean water area (collection area), 8, a water outlet channel, 9, a denitrification deep bed V-shaped filter, 10, a clean water pool, 11, a long-handle filter head, 12, a short-handle filter head, 13, a filter plate, 14, an aerator, 15, a backwashing water pump, 16, a backwashing water inlet pipe, 17, a backwashing water inlet valve, 18, a backwashing fan, 19, a backwashing air inlet pipe, 20, a backwashing air inlet valve, 21, an aeration fan, 22, an aeration pipeline, 23, a normal aeration valve, 24, a backwashing water outlet valve, 25, a backwashing water outlet pipeline, 26, a water inlet flow meter, 27, an online dissolved oxygen, an ammonia nitrogen multifunctional instrument, 28, online COD, nitrate nitrogen, total nitrogen multifunctional monitoring instrument, 29, A liquid level detector, 30, a carbon source dosing device, 31, a program automatic control system, 32, a control cable, 33, a water outlet electric valve, 34 and a water outlet pipeline
Detailed Description
The invention will be further described with reference to figures 1 and 2:
the utility model provides a post denitrification denitrogenation filtering pond device based on mark is carried to degree of depth which characterized in that: the device is formed by sequentially connecting an inner water inlet hole plate grid (1), an aerobic nitrification biological filter (3), a denitrification deep bed V-shaped filter (9) and a clean water tank (10) in series; the upper water outlet of the aerobic nitrification biological filter (3) is connected with a water distribution channel at the upper part of the denitrification deep bed V-shaped filter (9); the water outlet at the lower part of the denitrification deep bed V-shaped filter (9) is connected with a clean water tank (10); a carbon source dosing system (30) is arranged at the water inlet section of the denitrification deep bed V-shaped filter (9); the aerobic nitrification biological filter (3) also comprises a back flush system and an aeration system which are matched; the denitrification deep bed V-shaped filter (9) also comprises an air-water backwashing system, a surface sweeping system and a constant water level control system; the constant water level control system is formed by connecting a liquid level detector (29), an electric water outlet valve (33) and a program automatic control system (31) in the tank.
The aperture of the internal water inlet pore plate grid (1) is not more than 1 mm; the inner water inlet pore plate grating (1) is arranged at the water inlet (2) of the aerobic nitrification biological filter (3).
The aerobic nitrification biological filter (3) is sequentially composed of a water distribution area (4), a bearing layer (5), a ceramsite filter material reaction layer (6), a clear water area (7) and a water outlet channel (8) from bottom to top, a long-handle filter head (10) and a filter plate (12) are installed in the water distribution area (4), and the bearing layer (5) and the ceramsite filter material reaction layer (6) are arranged on the long-handle filter head.
The denitrification deep bed V-shaped filter (9) is sequentially composed of a water distribution area (4), a biological filter material reaction layer (6), a bearing layer (5), a collecting area (7), a water outlet pipe (34) and a water outlet electric valve (33) from top to bottom, wherein a short handle filter head (12) and a filter plate (13) are installed in the collecting area (7), and the bearing layer (5) and the biological filter material reaction layer (6) are arranged on the short handle filter head and the filter plate.
The thickness of the ceramsite filter material layer (6) of the aerobic nitrification biological filter (3) is 2.0-4.0 m, and the diameter of the ceramsite is 4-9 mm; the biological filter material layer (6) of the denitrification deep-bed V-shaped filter (9) has the thickness of 1.5-2.0 m and the diameter of the ceramsite filter material is 1.5-3.5 mm.
The aeration system of the aerobic nitrification biological filter (3) consists of a blower (21), an air pipeline (22), a regulating valve (23), an aerator (14) and a dissolved oxygen instrument (27), and the backwashing system comprises a backwashing blower (18), a backwashing water pump (15), water distribution and gas distribution pipelines (16, 19); the blower (21), the back washing blower (18), the back washing water pump (15) and the regulating valves (23, 20 and 17) are connected with a program automatic control system (31).
The aerobic nitrification biological filter (3) is provided with an on-line flow meter (26) at the water inlet end (2), and the aerobic nitrification biological filter (3) is provided with a nitrate nitrogen and ammonia nitrogen multifunctional on-line monitoring instrument and a dissolved oxygen instrument (27).
The water inlet end of the denitrification deep bed V-shaped filter (9) is internally provided with a COD (chemical oxygen demand), nitrate nitrogen and total nitrogen multifunctional online monitoring instrument (28).
A treatment process of a post denitrification nitrogen removal filter device with a deep standard extraction function comprises the following process steps:
(1) the secondary biochemical effluent firstly passes through the inner water inlet pore plate grid (1) to intercept all fibrous substances and impurities so as to prevent the fibrous substances from causing the blockage of a long-handle filter head (11) at the bottom of the subsequent aerobic nitrification biological filter (3), and the treated effluent enters the aerobic nitrification biological filter (3);
(2) a large amount of obligate nitrification biomembranes grow on the surface of the ceramsite filter material in the aerobic nitrification biological filter (3), the biomembranes fully utilize dissolved oxygen generated by the aeration of the blower (21) to complete the nitrification of all ammonia nitrogen (the ammonia nitrogen is less than 0.2mg/L), and the residual biochemical organic matters are removed; the program automatic control system (31) controls the frequency of the air blower (21) according to the monitoring data of the online dissolved oxygen meter (27), the aeration quantity supplied by the air blower (21) just meets the operation requirement of the aerobic nitrification biological filter (3), the electricity consumption is saved to the maximum extent, the dissolved oxygen of the aerobic nitrification biological filter (3) is 4-6 mg/L, the backwashing period is 24-72 h, a 'precipitation level and air water combined method' is adopted for backwashing, and the effluent treated by the aerobic nitrification biological filter (3) automatically flows into the denitrification deep bed V-shaped filter (9);
(3) deep denitrification and deep removal of suspended matters are completed in the denitrification deep bed V-shaped filter (9); the program automatic control system (31) automatically controls the optimal carbon source dosage according to the collected total nitrogen, nitrate nitrogen, COD (28) and inflow water flow data (26) in the wastewater to be subjected to upgrading modification, and the opening degree of an electric valve (33) for discharging water is automatically adjusted through a liquid level detector (29) connected with the program automatic control system (31) to control the constant water level inflow water, so that the falling water oxygenation is prevented, and the additional consumption of organic carbon sources and the reduction of the denitrification effect are further caused; a biological filter material layer (6) in the denitrification deep bed V-shaped filter (9) is attached with a large amount of denitrification microbial membranes, deep denitrification is completed through denitrification (TN is less than 5mg/L), and meanwhile, the deep stable removal of suspended matters (SS is less than 5mg/L) is realized through the filtration and interception of the biological filter material layer; backwashing by adopting a method of 'air washing → air washing + water washing → water washing + surface sweeping', wherein the backwashing period is 6-24 h, wherein the air washing is 70-100Nm/h, and the water washing is 15-25 m/h; the effluent of the denitrification deep bed V-shaped filter (9) automatically flows to a clean water tank (10), and the effluent of the clean water tank (10) is completely used as the final effluent of the system except for partially used as the backwashing water of the aerobic nitrification biological filter (3) and the denitrification deep bed V-shaped filter (9) according to the needs;
(4) the filtering speed of the aerobic nitrification biological filter (3) is controlled to be 8-15 m/h; the filtering speed of the denitrification deep bed V-shaped filtering pool (9) is controlled to be 5-12 m/h.
Example 1:
the treatment flow of a sewage treatment plant in Jiangsu province is 200000m3And d, the prokaryotic core process is an oxidation ditch and secondary sedimentation tank process, and the pollutant indexes before the secondary treatment effluent enters the process are as follows: COD 40mg/L, BOD5＝10mg/L，TN＝16mg/L，NH3-N-8 mg/L, SS-30 mg/L; after the treatment by the process, the effluent quality indexes are as follows: COD 20mg/L, BOD5＝4mg/L，NH3-N＝0.1mg/L，SS＝3mg/L，TN＝4mg/L。
Example 2:
the treatment flow of a certain municipal sewage treatment plant in Anhui province is 60000m3The original main process is 'AAO + secondary sedimentation tank' process, and the pollutant indexes before the secondary treatment effluent enters the process are as follows: COD 35mg/L, BOD5＝5mg/L，NH3-N-4 mg/L, SS-15 mg/L, TN-12 mg/L; after the treatment of the process device, the effluent quality indexes are as follows: COD 15mg/L, BOD5＜2mg/L，NH3-N＜0.1mg/L，SS＝2mg/L，TN＝2mg/L。
Example 3:
the treatment flow of a sewage treatment plant in a certain chemical industry park of Suzhou of Jiangsu province is 25000m3The original main process is 'hydrolysis acidification + AAO + secondary sedimentation tank + ozone', and the pollutant indexes before the secondary treatment effluent enters the process are as follows: COD 40mg/L, BOD5＝10mg/L，NH3-N-12 mg/L, SS-20 mg/L, TN-16 mg/L; after the treatment of the process device, the effluent quality indexes are as follows: COD 15mg/L, BOD5＝3mg/L，NH3-N＝0.5mg/L，SS＝3mg/L，TN＝4mg/L。
The invention adopts a combined process of the internal water inlet pore plate grating, and solves the problem that the filter head of the traditional aerobic nitrification biological filter is easy to block due to fibrous impurities; the denitrification deep-bed V-shaped filter is adopted to replace the traditional upflow denitrification filter, so that the problems that the traditional upflow denitrification filter is high in operating pressure and easy to harden a ceramsite filter layer and the SS of the effluent of the denitrification filter is difficult to be lower than 5mg/L and reaches the standard are solved; by utilizing the denitrification constant water level technology, the problem of drop level oxygenation of the denitrification deep bed V-shaped filter is solved, and a carbon source is greatly saved; the dissolved oxygen in the secondary biochemical effluent is fully utilized, an automatic control system is utilized to realize accurate aeration of a blower and accurate addition of a carbon source medicament according to an online dissolved oxygen meter, total nitrogen, nitrate nitrogen, COD and flow monitoring data, the load impact resistance is stronger, the primary A effluent or the primary B effluent can be subjected to standard extraction, the effluent is ensured to economically and stably reach the IV water standard of the environmental quality standard of surface water (GB3838-2002), and the method has great popularization and application values for the sewage with low carbon-nitrogen ratio.
The above-mentioned embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. The utility model provides a post denitrification denitrogenation filtering pond device based on mark is carried to degree of depth which characterized in that: the device is formed by sequentially connecting an inner water inlet hole plate grid, an aerobic nitrification biological filter, a denitrification deep bed V-shaped filter and a clean water tank in series; the upper water outlet of the aerobic nitrification biological filter is connected with a water distribution channel at the upper part of the denitrification deep bed V-shaped filter; the water outlet at the lower part of the denitrification deep bed V-shaped filter tank is connected with a clean water tank; a carbon source dosing system is arranged at the water inlet section of the denitrification deep bed V-shaped filter; the aerobic nitrification biological filter also comprises a back washing system and an aeration system; the denitrification deep bed V-shaped filter also comprises an air-water backwashing system, a surface sweeping system and a constant water level control system; the constant water level control system is formed by connecting a liquid level detector, an electric water outlet valve and a program automatic control system in the tank.
2. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: the aperture of the internal water inlet pore plate grid is not more than 1 mm.
3. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: the aerobic nitrification biological filter is composed of a water distribution area, a bearing layer, a ceramsite filter material reaction layer, a clear water area and a water outlet channel from bottom to top in sequence, wherein a long-handle filter head and a filter plate are arranged in the water distribution area, and the bearing layer and the ceramsite filter material reaction layer are arranged on the long-handle filter head and the filter plate.
4. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: the denitrification deep bed V-shaped filter tank sequentially comprises a water distribution area, a biological filter material reaction layer, a bearing layer, a collecting area, a water outlet pipe and an electric water outlet valve from top to bottom, wherein a short-handle filter head and a filter plate are arranged in the collecting area, and the bearing layer and the biological filter material reaction layer are arranged on the short-handle filter head and the filter plate.
5. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: the thickness of the ceramsite filter layer of the aerobic nitrification biological filter is 2.0-4.0 m, and the diameter of the ceramsite is 4-9 mm; the thickness of the biological filter material layer of the V-shaped filter of the denitrification deep bed is 1.5-2.0 m, and the diameter of the biological filter material is 1.5-3.5 mm.
6. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: the aeration system of the aerobic nitrification biological filter consists of a blower, an air pipeline, a regulating valve, an aerator and a dissolved oxygen instrument, and the backwashing system comprises a backwashing fan, a backwashing water pump, a water distribution pipeline and a gas distribution pipeline; the air blower, the back washing fan, the back washing water pump and the regulating valve are connected with the program automatic control system.
7. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: the aerobic nitrification biological filter is provided with an online flowmeter at the water inlet end, and a nitrate nitrogen and ammonia nitrogen multifunctional online monitoring instrument and a dissolved oxygen instrument are arranged in the aerobic nitrification biological filter.
8. The post denitrification nitrogen removal filter device based on the depth upgrading of the claim 1, characterized in that: a multifunctional online monitoring instrument for COD, nitrate nitrogen and total nitrogen is arranged in the water inlet end of the denitrification deep bed V-shaped filter.
9. A treatment process of a post denitrification denitrogenation filter device adopting the depth upgrading of any one of claims 1 to 8 mainly comprises the following treatment steps:
(1) the secondary biochemical effluent firstly passes through an inner water inlet pore plate grid to intercept all fibrous substances and impurities so as to prevent the fibrous substances from causing the blockage of a long-handle filter head at the bottom of a subsequent aerobic nitrification biological filter, and the treated effluent enters the aerobic nitrification biological filter;
(2) a large amount of obligate nitrification biomembranes grow on the surface of ceramsite in the aerobic nitrification biological filter, the biomembranes fully utilize dissolved oxygen generated by aeration of a blower to complete nitrification of all ammonia nitrogen (the ammonia nitrogen is less than 0.2mg/L) and remove residual biochemical organic matters; the program automatic control system controls an air blower according to the monitoring data of an online dissolved oxygen meter, the aeration rate supplied by the air blower just meets the operation requirement of the aerobic nitrification biological filter, the electricity consumption is saved to the maximum extent, the dissolved oxygen of the aerobic nitrification biological filter is 4-6 mg/L, the water inlet filtration speed is 2-15 m/h, the backwashing period is 24-72 h, the 'water level reduction + air water combination method' is adopted for backwashing, and the effluent treated by the aerobic nitrification biological filter automatically flows into the denitrification deep bed V-shaped filter;
(3) deep denitrification and deep removal of suspended matters are completed in the denitrification deep bed V-shaped filter; the program automatic control system automatically controls the optimal carbon source dosage according to the collected total nitrogen, nitrate nitrogen, COD and inflow flow data in the wastewater to be subjected to upgrading modification, the inflow filtering speed is 5-12 m/h, the opening degree of an electric outlet valve is automatically adjusted through a liquid level detector connected with the program automatic control system, the constant water level inflow is controlled, the drop oxygenation is prevented, and the additional consumption of an organic carbon source and the reduction of the denitrification effect are further caused; a large amount of denitrifying microbial membranes are attached to a biological filter material layer in a denitrifying deep bed V-shaped filter tank, deep denitrification is completed through denitrification (TN is less than 5mg/L), and meanwhile, the deep stable removal of suspended matters (SS is less than 5mg/L) is realized through the filtration and interception of the biological filter material layer; backwashing by adopting a method of 'air washing → air washing + water washing → water washing + surface sweeping', wherein the backwashing period is 6-24 h, wherein the air washing is 70-100m/h, and the water washing is 15-25 m/h; the effluent of the denitrification deep bed V-shaped filter automatically flows to a clean water tank, and the effluent of the clean water tank is used as the final effluent of the system except for the required part of the effluent of the aerobic nitrification biological filter and the denitrification deep bed V-shaped filter.
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