CN110606576A - Efficient biological denitrification device for sewage treatment - Google Patents
Efficient biological denitrification device for sewage treatment Download PDFInfo
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- CN110606576A CN110606576A CN201910990754.9A CN201910990754A CN110606576A CN 110606576 A CN110606576 A CN 110606576A CN 201910990754 A CN201910990754 A CN 201910990754A CN 110606576 A CN110606576 A CN 110606576A
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- fluidized
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- 239000010865 sewage Substances 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000945 filler Substances 0.000 claims abstract description 38
- 239000012530 fluid Substances 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000005273 aeration Methods 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 23
- 239000010802 sludge Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229910021536 Zeolite Inorganic materials 0.000 claims description 10
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 10
- 239000010457 zeolite Substances 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 claims description 2
- AVXURJPOCDRRFD-UHFFFAOYSA-N hydroxylamine group Chemical group NO AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 claims description 2
- CUILPNURFADTPE-UHFFFAOYSA-N hypobromous acid Chemical compound BrO CUILPNURFADTPE-UHFFFAOYSA-N 0.000 claims description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 34
- 238000007254 oxidation reaction Methods 0.000 abstract description 23
- 238000000034 method Methods 0.000 abstract description 22
- 230000003647 oxidation Effects 0.000 abstract description 22
- 230000008569 process Effects 0.000 abstract description 20
- 229910021529 ammonia Inorganic materials 0.000 abstract description 17
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 16
- 238000012856 packing Methods 0.000 abstract description 11
- 239000002028 Biomass Substances 0.000 abstract description 4
- 239000013043 chemical agent Substances 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000009935 nitrosation Effects 0.000 description 6
- 238000007034 nitrosation reaction Methods 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 5
- 241001453382 Nitrosomonadales Species 0.000 description 5
- 239000003463 adsorbent Substances 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000000813 microbial effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012765 fibrous filler Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Inorganic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a high-efficiency biological denitrification device for sewage treatment. The device mainly comprises a constant-temperature water bath layer, an outer cylinder, a cylindrical fluid director, an inner cavity, a triangular fluid director, fluidized packing, fixed bed packing and a dosing system; according to the characteristics of the structure and the function of the device, the device is divided into a central upward flow area, an outer downward flow area, a bottom water inlet aeration area, a peripheral water outlet area and a fixed bed filling area; fixed bed packing is arranged on the inner wall of the outer barrel and the outer wall of the inner cavity, and fluidized packing is added into the device. The special structural design of the invention optimizes the flow field of the reactor, and realizes automatic circulation and zone control; the combination of the fluidized filler and the fixed bed filler improves the micro-ecological environment in the reactor, promotes the enrichment of functional flora, improves the biomass in the device, and realizes the efficient and stable operation of a partial nitrosation-anaerobic ammonia oxidation process in low ammonia nitrogen concentration; the dosing system is started when the running performance of the device is reduced, and chemical agents are added to improve the denitrification effect. The invention has the characteristics of compact structure, simple operation, short flow, flow field optimization, energy conservation, high efficiency and stable operation.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a high-efficiency biological denitrification device for sewage treatment.
Background
With the high-speed development of economy and the continuous promotion of urbanization process in China, the water environment problem is increasingly prominent. The discharge standard of the sewage treatment plant is from original first grade B to first grade A, and then to the present surface standard four types, which puts higher requirements on sewage treatment theory and technology, and the problem that the nitrogen concentration of the effluent does not reach the standard is generally solved. A. the2The conventional biological denitrification process such as the/O and oxidation ditch, which takes the nitrification-denitrification principle as the core, has high operation cost and difficult further improvement of denitrification efficiency. In contrast, the anaerobic ammonia oxidation denitrification technology has attracted attention because of its low carbon and energy saving, short process, high denitrification efficiency and small sludge amount.
The partial nitrosation-anaerobic ammonia oxidation technology utilizes the synergistic action of ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria to realize nitrosation and anaerobic ammonia oxidation, thereby achieving the aim of denitrification. For municipal sewage with low ammonia nitrogen content, part of nitrosation process is difficult to control, intermediate product nitrite is extremely unstable, and can be easily oxidized into nitrate continuously, thereby influencing the anaerobic ammonia oxidation process of the next stage. Therefore, how to stabilize partial nitrosation in a low-concentration ammonia nitrogen environment, strengthen anaerobic ammoxidation and realize the high-efficiency and low-consumption denitrification advantages of the mainstream partial nitrosation-anaerobic ammoxidation technology becomes a key problem for the engineering wide application of the technology.
The biological filler has the characteristics of high strength, light weight, large specific surface area, high porosity and the like, can provide an attachment site for the growth and the propagation of microorganisms, and is a common improvement method for improving the microbial biomass in a reactor and strengthening the biological action at a certain stage in a process flow. In the treatment of low ammonia nitrogen wastewater, the fluidized filler with ammonia nitrogen adsorption performance is selected, and a local high-concentration environmental condition is formed by the adsorption effect of the filler on ammonia nitrogen, so that the micro-ecological environment is optimized, thereby being beneficial to the growth and accumulation of ammonia oxidizing bacteria and the inhibition of nitrite oxidizing bacteria and stabilizing part of the nitrosation process. By arranging the fixed fiber module filler, residual ammonia nitrogen can be adsorbed, sufficient matrix is provided for anaerobic ammonia oxidation reaction, an attachment place can be provided for anaerobic ammonia oxidizing bacteria, microbial biomass is improved, and the anaerobic ammonia oxidation process is further strengthened.
In conclusion, the low-ammonia nitrogen wastewater treatment based on the high-efficiency low-consumption partial nitrosation-anaerobic ammonia oxidation technology has the problems of difficult process control and unstable operation performance. The fluidized filler and the fixed fiber module which have the adsorption effect on ammonia nitrogen and are favorable for microorganism adhesion are selected, so that nitrosation can be effectively stabilized, the anaerobic ammonia oxidation process can be enhanced, and low-consumption stable operation of biological denitrification of low-ammonia nitrogen wastewater can be realized. Therefore, based on the thought, the invention provides the efficient biological denitrification device for sewage treatment, which realizes efficient and stable operation of a part of nitrosation-anaerobic ammonia oxidation process in the device and has the characteristics of compact structure, optimized flow field, small occupied area, simple operation, low consumption and high efficiency.
Disclosure of Invention
The problems to be solved by the invention are as follows: aiming at the problems that the traditional biological denitrification process taking nitrification-denitrification as a core has large energy consumption, long flow path and low efficiency, and the biological denitrification process based on the anaerobic ammonia oxidation technology is difficult to control and has unstable operation performance, the invention provides the low-ammonia nitrogen wastewater biological denitrification device which has the advantages of simple and compact structure, optimized flow field, convenient operation, easy control, low energy consumption and stable long-term operation performance.
In order to solve the technical problems, the solution proposed by the invention is as follows: the utility model provides a sewage treatment's high-efficient biological denitrification device which characterized in that: the device consists of a constant-temperature water bath layer, an outer cylinder, a cylindrical fluid director, an inner cavity, a triangular fluid director, fluidized packing, fixed bed packing and a dosing system; the device is divided into a bottom water inlet aeration zone, a central upward flow zone, an outer downward flow zone, a peripheral water outlet zone and a fixed filler zone.
The thickness of the constant-temperature water bath layer is 2 ~ 5cm, and a constant-temperature layer water inlet and a constant-temperature layer water outlet are formed in the constant-temperature water bath layer.
The outer cylinder is formed by connecting an upper cylinder and a lower inverted circular table, the height-diameter ratio of the upper cylinder is 1.2 ~, a fixed support, a water outlet, a chemical feeding port, fixed fiber fillers I and an annular perforated chemical feeding pipe are arranged on the inner wall of the upper cylinder, the upper bottom surface of the lower inverted circular table is connected with the upper cylinder, the diameter of the lower bottom surface is the same as that of the upper cylinder, the diameter of the lower bottom surface is 0.2 ~ times of that of the upper cylinder, the height of the lower bottom surface is 1.2 ~ times of that of the lower bottom surface, a water inlet, an air inlet and a sludge discharge port are arranged on the lower bottom surface, the fixed support is provided with 3 groups which are respectively used for fixing a cylindrical fluid director, an inner cavity and a triangular fluid director, the number of each group is 2 ~, the fixed fiber fillers I are made of activated carbon fibers and are placed along the inner wall from the lower part of the water outlet, the placement height is 0.5 392Per g, dry weight 80 ~ 150g/m2The chemical feeding system comprises a chemical feeding system, an annular perforated chemical feeding pipe, a chemical feeding system and a water inlet, wherein the annular perforated chemical feeding pipe is arranged along the inner wall of an upper cylinder in the chemical feeding system and is connected with a chemical feeding port, the pipe diameter is 5 ~ 10mm, the aperture of the perforated hole is 1 ~ 2mm, the fixed height is positioned at 1/10 ~ 1/2 where fiber filler I is fixed and is horizontal to the chemical feeding port, the chemical feeding system is started to feed chemicals when the denitrification effect of the device is reduced to the total nitrogen removal rate of less than 50%, the chemicals are hydroxylamine, perchloric acid, hypochlorous acid, hypobromous acid or nitrous acid, the water inlet is positioned at the center of the lower bottom surface of an inverted round table, the water inlet is positioned at 0.5 ~ 2cm on theMixing the gas and the sludge discharge port is positioned at the position of 0.5 ~ 2cm on the right side of the gas inlet.
The cylindrical fluid director consists of a hollow cylinder I and fixed supports I, wherein the diameter of the hollow cylinder I is 0.4 ~ 0.6.6 times of that of the upper cylinder, and the number of the fixed supports I is 2 ~ 4.
The inner cavity consists of a hollow cylinder II, a fixed fiber filler II and a fixed support II, the height-diameter ratio of the hollow cylinder II is 2 ~ 8, the height of the hollow cylinder II is 0.5 ~ 0.85.85 of that of the upper cylinder, the fixed fiber filler II is made of activated carbon fibers and is arranged on the outer wall of the hollow cylinder II, the thickness of the fixed fiber filler II is 0.2 ~ 5cm, and the specific surface area of the fixed fiber filler II is BET800 ~ 1200m2Per g, dry weight 80 ~ 150g/m2The number of the fixing supports II is 2 ~ 4 and the fixing supports II are arranged on the outer wall of the inner cavity.
The triangular fluid director consists of a hollow guide cylinder and fixed supports III, the hollow guide cylinder is formed by connecting an upper end cylinder body and a lower end platform body, the upper end of the hollow guide cylinder extends into an inner cavity and is level with the bottom end of the inner cavity, the diameter of the upper end face is 0.4 ~ 0.6.6 times of the diameter of an inner cavity cylinder, the diameter of the lower end face is 2 ~ 4 times of the diameter of the upper end face, the height of the lower end face is 1.5 ~ 3 times of the diameter of the upper end face, and the number of the fixed supports III is 2 ~ 4.
The fluidized filler is zeolite crushed by a standard sieve with 30 ~ 200 meshes and has a specific surface area of 50 ~ 500m2G, adsorption capacity of 7.00 ~ 20.00.00 mg/g, pore volume of 0.08 ~ 0.20.20 cm3The pore diameter is 0.5 ~ 2.0.0 nm, and the dosage is 5 ~ 15 g/L.
Compared with the existing biological denitrification device, the invention has the following obvious advantages: (1) according to the invention, zeolite fluidized adsorbent is combined with an activated carbon fiber fixed bed, so that a part of nitrosation-anaerobic ammonia oxidation process can stably operate in biological treatment of low ammonia nitrogen wastewater; by adding zeolite adsorbent, the adsorption effect of zeolite on ammonia nitrogen is utilized to form local high ammonia nitrogen concentration in the environment of low ammonia nitrogen wastewater, so that the growth and enrichment of ammonia oxidizing bacteria are promoted, nitrite oxidizing bacteria are inhibited, and the stable operation of part of nitrosation process is realized; by designing the activated carbon fiber fixed bed, a large amount of residual ammonia nitrogen can be adsorbed, sufficient matrix is provided for the anaerobic ammonia oxidation process, the activated carbon fiber has the characteristics of large surface area and high affinity, and can provide a growing attachment or settlement condition for the growth and the propagation of anaerobic ammonia oxidation bacteria, so that a biological membrane with a strong purification activity function is formed, and the anaerobic ammonia oxidation denitrification effect can be enhanced; (2) the method is based on a partial nitrosation-anaerobic ammonium oxidation biological denitrification technology, does not need an additional carbon source, has small aeration quantity and low energy consumption, is not easy to lose sludge, and can maintain higher sludge concentration; (3) the invention realizes the optimization of the flow field of the reactor and the automatic circulation of the interior by utilizing the water inlet aeration at the lower end of the device and the unique cylindrical internal design structure; (4) according to the anaerobic ammonium oxidation device, the dosing point is specially arranged in the device, aiming at the process characteristic that the performance of the anaerobic ammonium oxidation process is automatically reduced after the anaerobic ammonium oxidation process is operated for a period of time in practical application, when the water outlet effect is deteriorated, a proper amount of chemical agent can be added to inhibit the growth of nitrite oxidizing bacteria and heterotrophic bacteria; (5) the invention is an integrated reactor of partial nitrosation-anaerobic ammonia oxidation technology, the two-stage reaction is synchronously completed in one reactor, and the invention has the characteristics of small occupied area, short flow, simple operation and convenient control.
In conclusion, the zeolite fluidized adsorbent and the activated carbon fiber fixed bed are utilized to adsorb ammonia nitrogen and attach microorganisms, so that the microbial ecological environment is optimized, and the microbial biomass is improved; the unique design structure optimizes the flow field in the device and realizes automatic circulation; the design of the dosing point can adjust the running state in time under the condition of performance reduction; can realize the efficient and stable operation of partial nitrosation-anaerobic ammonia oxidation process, and has the characteristics of compact structure, low energy consumption, convenient operation, easy control and stable long-term operation performance.
Drawings
FIG. 1 is a schematic structural diagram of a high-efficiency biological denitrification device for sewage treatment.
Fig. 2 is a schematic view of the structure of the outer cylinder.
Fig. 3 is a schematic structural view of a cylindrical flow deflector.
Fig. 4 is a schematic diagram of the lumen structure.
Fig. 5 is a schematic view of a triangular flow director.
Fig. 6 is a schematic diagram of device partitioning.
Description of the figures
| (1) Constant temperature water bath layer | (1-1) water inlet of constant temperature layer |
| (1-2) water outlet of constant temperature layer | (2) Outer cylinder |
| (2-1) water outlet | (2-2) water inlet |
| (2-3) air intake | (2-4) sludge discharge port |
| (2-5) medicine adding port | (2-6) fixing support |
| (2-7) annular perforated dosing tube | (2-8) fixing fibrous Filler I |
| (2-9) Upper Cylinder | (2-10) lower rounding table |
| (3) Tubular fluid director | (3-1) hollow Cylinder I |
| (3-2) fixing support I | (4) Inner cavity |
| (4-1) fixing support II | (4-2) fixing fibrous Filler II |
| (4-3) hollow Cylinder II | (5) Triangular fluid director |
| (5-1) fixing bracket III | (5-2) hollow draft tube |
| (6) Fluidized packing | (7) Fixed bed packing |
| (8) Medicine feeding system | (9) Bottom water inlet aeration zone |
| (10) Central upward flow zone | (11) Outer downward flow area |
| (12) Peripheral water outlet area | (13) Fixed packing area |
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
Referring to fig. 1 ~ 6, a high-efficiency biological denitrification device for sewage treatment is manufactured, and the device mainly comprises a constant-temperature water bath layer (1) (with the thickness of 20 mm), an outer cylinder (2), a cylindrical fluid director (3), an inner cavity (4), a triangular fluid director (5), fluidized packing (6), fixed bed packing (7) and a dosing system (8).
The constant temperature water bath layer (1) is provided with a constant temperature layer water inlet (1-1) (with the diameter of an orifice being 7 mm) and a constant temperature layer water outlet (1-2) (with the diameter of an orifice being 7 mm).
The outer cylinder (2) consists of an upper cylinder (2-9) (290 mm in height and 210mm in diameter) and a lower inverted round table (2-10) (210 mm in diameter of an upper bottom surface and 50mm in diameter of a lower bottom surface and 60mm in height); the upper cylinder (2-9) is provided with a water outlet (2-1) (the diameter of an orifice is 7 mm), a chemical feeding port (2-5) (the diameter of the orifice is 7 mm), a fixed fiber filler I (2-8) (the thickness is 30 mm), an annular perforated chemical feeding pipe (2-7) (the pipe diameter is 5mm, the pore diameter is 1 mm) and a fixed support (2-6); the water outlet (2-1) is arranged at a position 20mm away from the top end of the device; the medicine adding port (2-5) is arranged at a position 60mm away from the top end of the device; the annular perforated dosing pipe (2-7) is arranged along the inner wall of the upper cylinder; the fixed fiber filler I (2-8) adopts an activated carbon fiber bundle, is arranged at a position 32mm away from the top end of the device and has a height of 240 mm; the fixed supports (2-6) are provided with 3 groups, each group is 4, and the height of each group is 5mm, 195mm and 272mm away from the top end in sequence; the lower bottom surface of the lower inverted round table (2-10) is provided with a water inlet (2-2) (with the diameter of an orifice of 7 mm), an air inlet (2-3) (with the diameter of an orifice of 7 mm) and a sludge discharge port (2-4) (with the diameter of an orifice of 7 mm); the air inlet (2-3) is positioned in the center of the bottom surface; the water inlet (2-2) is positioned at the 10mm position on the left side of the air inlet (2-3), extends into the triangular fluid director (5), and is mixed with the inlet air through a right-angle elbow; the sludge discharge port (2-4) is positioned at the position of 10mm on the right side of the air inlet (2-3).
The cylindrical fluid director (3) consists of a hollow cylinder I (3-1) (with the height of 118mm and the diameter of 110 mm) and a fixed bracket I (3-2); the distance between the top end of the hollow cylinder I (3-1) and the top end of the device is 7 mm; the fixed supports I (3-2) are arranged at positions 5mm away from the top end of the hollow cylinder I (3-1), and the number of the fixed supports I is 4.
The inner cavity (4) consists of a fixed support II (4-1), a fixed fiber filler II (4-2) (with the thickness of 10 mm) and a hollow cylinder II (4-3) (with the height of 200mm and the diameter of 50 mm); the fixed supports II (4-1) are arranged 15mm away from the top end of the hollow cylinder II (4-3), and the number of the fixed supports II is 4; the fixed fiber filler II (4-2) adopts an activated carbon fiber bundle and is arranged on the outer wall of the hollow cylinder II (4-3); the hollow cylinder II (4-3) is arranged at a height 50mm from the top end of the device.
The triangular fluid director (5) consists of a fixed bracket III (5-1) and a hollow guide cylinder (5-2); the hollow guide cylinder (5-2) consists of an upper end column body (with the height of 35mm and the diameter of 30 mm) and a lower end platform body (with the upper bottom surface diameter of 30mm and the lower bottom surface diameter of 100mm and the height of 30 mm), and the top end of the hollow guide cylinder (5-2) is horizontal to the bottom end of the inner cavity (4); the fixed supports III (5-1) are arranged 27mm away from the top end of the hollow guide cylinder (5-2), and the number of the fixed supports III is 4.
The fluidized filler (6) is selected from zeolite which is crushed by a standard sieve with 30-200 meshes and has the specific surface area of 200 ~ 400m2G, adsorption capacity of 7.00 ~ 20.00.00 mg/g, pore volume of 0.08 ~ 0.20.20 cm3The zeolite fluidized adsorbent is added according to the dosage of 10g/L, wherein the pore diameter is 0.5 ~ 2.0.0 nm.
Example 2
The efficient biological denitrification device based on the fluidized filler and the fixed fiber filler is used for simulated wastewater treatment in embodiment 1, ammonium bicarbonate is used as a unique water inlet nitrogen source, a trace element solution is added for simulated wastewater preparation, the concentration of inlet ammonia nitrogen is 46.5 ~ 53.8.8 mg/L, the pH is =7.5 ~ 8.5.5, the temperature is 32 ~ 36 ℃, the effective volume of the device is designed to be 4.86L, zeolite is selected as the fluidized filler, the fluidized filler is crushed by a standard sieve with 30-200 meshes, and the specific surface area is 265m2Per g, pore volume of 0.15cm3The pore diameter is 1.68nm, the adsorption capacity is 15.7mg/g, and the adding amount is 48.6 g; the fixed fiber filler has a specific surface area of BET1000m2G, gram weight 120g/m2Taking 1.5L of nitrified sludge of a sewage treatment plant and 48.6g of zeolite fluidized adsorbent in the device, inoculating 1.5L of anaerobic ammonium oxidation sludge cultured and domesticated in a laboratory to an activated carbon fiber fixed bed, starting a water pump to feed water, keeping hydraulic retention time for 6 hours, simultaneously starting aeration, controlling aeration amount to be 0.5L/min, controlling dissolved oxygen concentration of an inner cavity to be 0.3 ~ 0.5mg/L and dissolved oxygen concentration of the activated carbon fiber fixed bed to be 0.05mg/L, continuously operating for 95 days, respectively enabling removal rates of ammonia nitrogen and total nitrogen to reach 89.7% and 73.5%, and keeping stable operation performance.
Claims (5)
1. A high-efficiency biological denitrification device for sewage treatment is characterized by comprising a constant-temperature water bath layer (1), an outer cylinder (2), a cylindrical fluid director (3), an inner cavity (4), a triangular fluid director (5), fluidized fillers (6), fixed bed fillers (7) and a dosing system (8); the device is divided into a bottom water inlet aeration zone (9), a central upward flow zone (10), an outer downward flow zone (11), a peripheral water outlet zone (12) and a fixed filler zone (13); the constant-temperature water bath layer (1) is provided with a constant-temperature layer water inlet (1-1) and a constant-temperature layer water outlet (1-2); the outer barrel (2) is formed by connecting an upper barrel (2-9) and a lower inverted round table (2-10), the upper barrel (2-9) is provided with a water outlet (2-1), a medicine feeding port (2-5), fixed fiber fillers I (2-8), an annular perforated medicine feeding pipe (2-7) and a fixed support (2-6), the lower bottom surface of the lower inverted round table (2-10) is provided with a water inlet (2-2), an air inlet (2-3) and a sludge discharge port (2-4), the air inlet (2-3) is positioned in the center of the bottom surface, the water inlet (2-2) is positioned on one side of the lower inverted round table and extends into the triangular fluid director (5), and the water inlet and the air inlet are mixed through a right-angle elbow; the cylindrical fluid director (3) consists of a hollow cylinder I (3-1) and a fixed bracket I (3-2) on the outer wall; the inner cavity (4) is composed of a fixed support II (4-1), a fixed fiber filler II (4-2) and a hollow cylinder II (4-3); the triangular fluid director (5) is composed of a fixed support III (5-1) and a hollow guide cylinder (5-2).
2. The device of claim 1, wherein the height to diameter ratio of the upper cylinder (2-9) is 1.2 ~ 2, and the height to diameter ratio of the hollow cylinder II (4-3) is 2 ~ 8.
3. The device of claim 1, wherein the fixed fiber filler I (2-8) and the fixed fiber filler II (4-2) are activated carbon fibers with a specific surface area of BET800 ~ 1200 m/1200 m2Per g, dry weight 80 ~ 150g/m2The thickness of the fixed fiber filler I (2-8) is 0.2 ~ 5cm, the fixed fiber filler I (2-8) is placed along the inner wall of the upper cylinder (2-9) from the lower part of the water outlet, the placing height is 0.5 ~ 0.85.85 times of the height of the upper cylinder (2-9), and the fixed fiber filler II (4-2) is arranged on the outer wall of the hollow cylinder II (4-3).
4. The efficient biological denitrification device for sewage treatment according to claim 1, wherein the annular perforated dosing pipe (2-7) in the dosing system (8) is arranged along the inner wall of the upper cylinder (2-9) and connected with the dosing port (2-5), the pipe diameter is 5 ~ 10mm, the aperture of the perforated hole is 1 ~ 2mm, the annular perforated dosing pipe (2-7) is positioned at 1/10 ~ 1/2 of the fixed fiber filler I (2-8), when the denitrification effect of the device is reduced to the total nitrogen removal rate of less than 50%, the dosing system (8) is started to dose the medicament, and the medicament is hydroxylamine, perchloric acid, hypochlorous acid, hypobromous acid or nitrous acid.
5. The device of claim 1, wherein the fluidized filler (6) is zeolite crushed by a standard sieve of 30 ~ 200 mesh and has a specific surface area of 50 ~ 500m2G, adsorption capacity of 7.00 ~ 20.00.00 mg/g, pore volume of 0.08 ~ 0.20.20 cm3The pore diameter is 0.5 ~ 2.0.0 nm, and the dosage is 5 ~ 15 g/L.
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