CN115286100A - Device and method for realizing deep denitrification of tail water of sewage plant by coupling short-cut denitrification anaerobic ammonia oxidation with anoxic MBBR (moving bed biofilm reactor) process - Google Patents
Device and method for realizing deep denitrification of tail water of sewage plant by coupling short-cut denitrification anaerobic ammonia oxidation with anoxic MBBR (moving bed biofilm reactor) process Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 122
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 37
- 239000010865 sewage Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003647 oxidation Effects 0.000 title claims abstract description 32
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 25
- 230000008878 coupling Effects 0.000 title claims description 9
- 238000010168 coupling process Methods 0.000 title claims description 9
- 238000005859 coupling reaction Methods 0.000 title claims description 9
- 239000010802 sludge Substances 0.000 claims abstract description 47
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000855 fermentation Methods 0.000 claims abstract description 34
- 230000004151 fermentation Effects 0.000 claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000003860 storage Methods 0.000 claims abstract description 20
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 239000000945 filler Substances 0.000 claims abstract description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000012806 monitoring device Methods 0.000 claims abstract description 9
- 241000894006 Bacteria Species 0.000 claims description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 4
- 235000017281 sodium acetate Nutrition 0.000 claims description 4
- 239000001632 sodium acetate Substances 0.000 claims description 4
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- 238000003756 stirring Methods 0.000 claims description 3
- 206010021143 Hypoxia Diseases 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 10
- 239000000758 substrate Substances 0.000 description 7
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- 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
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a device and a method for realizing deep denitrification of tail water of a sewage plant by a short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR (moving bed biofilm reactor) process. Comprises a water outlet and storage tank of a secondary sedimentation tank; the water outlet and storage tank of the secondary sedimentation tank is connected with a first water inlet of the PDA-MBBR through a first water inlet pump; the sludge fermentation liquor storage water tank is connected with a second water inlet of the PDA-MBBR through a second water inlet pump; the PDA-MBBR is connected with the water inlet of the clean water tank through the water outlet; an anoxic stirrer (3.7), a pH probe (3.8), a Dissolved Oxygen (DO) probe (3.9), an ammonia nitrogen and nitrate nitrogen online monitoring device (3.10) and an MBBR filler (3.11) are arranged in the PDA-MBBR; and a control device is connected with the first water inlet pump, the second water inlet pump II, the anoxic stirrer, the pH probe, the Dissolved Oxygen (DO) probe and the nitrogen and nitrate nitrogen online monitoring device through signal wires. The invention takes the fermentation liquor generated by anaerobic fermentation of the sludge as the carbon source for short-cut denitrification, has simple reaction process, does not need an organic carbon source, saves the operation cost, and can simultaneously realize the deep denitrification of the tail water of the sewage plant by combining with the short-cut denitrification.
Description
Technical Field
The invention relates to the technical field of biological denitrification and sludge fermentation reduction, in particular to a method for realizing deep denitrification of tail water of a sewage plant by using a sludge fermentation liquid as a carbon source through a short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR process.
Background
When the urban water shortage problem is solved at home and abroad, the tail water of the sewage plant can be used as a secondary water source to be reused in urban rivers and used as make-up water of underground water sources. Urban inland rivers are mostly urban sewage-receiving rivers, and the 'surface water environmental quality standard' (GB 3838-2002) standards of IV (TN1.5mg/L) and V (TN2.0mg/L) are mostly implemented. However, the sewage treatment plant drainage implements the first grade A standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-2002), and the TN discharge limit value is 15mg/L, which is far from meeting the IV and V standards of urban inland rivers and the requirement of supplementing water of underground water sources. However, because the organic carbon source in municipal sewage in China is insufficient, the conventional biological denitrification process is difficult to meet the discharge standard, and the addition of an external carbon source to meet the denitrification requirement not only increases the treatment cost, but also increases the yield of excess sludge. In addition, the treatment of excess sludge in sewage treatment plants is very costly, and the requirements for sludge disposal are constantly increasing. Therefore, how to improve the sewage treatment effect under the guidance of the concepts of energy conservation, consumption reduction and sustainable development and effectively treating excess sludge becomes an urgent problem to be solved in sewage treatment plants.
In recent years, anaerobic ammonia oxidation technology has become a research hotspot in a novel denitrification process due to the characteristics of economy and high efficiency. Anammox refers to a process in which anammox bacteria convert nitrite nitrogen and ammonia nitrogen into nitrogen simultaneously by using the nitrite nitrogen as an electron acceptor and the ammonia nitrogen as an electron donor under anaerobic conditions. The technology belongs to autotrophic nitrogen removal, does not need a carbon source or oxygen supply, and has the advantages of low sludge production and high volumetric nitrogen removal efficiency. However, the anaerobic ammonia oxidation bacteria grow slowly, have long multiplication time, are sensitive to environmental conditions, are not easy to enrich and culture, and have harsh substrate obtaining conditions, so that the development and application of the anaerobic ammonia oxidation technology are limited.
The short-cut denitrification technology controls the whole denitrification process, namely the process of reducing nitrate nitrogen to nitrogen, to be reduced to nitrite nitrogen, so that the nitrite nitrogen is continuously accumulated, and sufficient substrates are provided for anaerobic ammoxidation. The need for short-cut denitrification with neither aeration nor 60% carbon source reduction has been a focus of research in recent years. The short-range denitrification usually needs alkaline environment, the C/N ratio is 3, sodium acetate is a carbon source and other conditions, but the domestic sewage treatment difficulty in the actual engineering is high, and the operation cost is high. Therefore, finding an economically feasible method for realizing short-cut denitrification becomes an important factor.
The treatment of a large amount of excess sludge generated by municipal sewage treatment plants becomes a great problem day by day, the treatment cost is high, secondary pollution is easily caused by improper treatment, and the sludge contains abundant organic substances, and short-chain fatty acid can be generated and used as a carbon source for heterotrophic denitrification through hydrolytic acidification. The research shows that: under the condition of providing short-chain fatty acid as a carbon source, short-range denitrification can easily and stably realize higher NO 2 - And (4) accumulating. Short-cut denitrification with sludge fermentation liquor as carbon source to accumulate NO 2 - N can not only realize sludge reduction and resource utilization, but also reduce the consumption of an external carbon source for sewage treatment, reduce the cost of adding the external carbon source in a sewage plant and achieve the effects of energy conservation and consumption reduction.
The slow-growing anammox bacteria tend to grow in aggregates (such as biomembranes), and the addition of the filler (carrier) is one of effective means for enriching the anammox bacteria. Therefore, the filler is added into the sewage treatment reactor to form a suspension carrier double-sludge system or have the potential of enriching the anaerobic ammonium oxidation bacteria.
Disclosure of Invention
In order to solve the problems, the invention provides a method for realizing deep denitrification of tail water of a sewage plant by using a sludge fermentation liquid as a carbon source through a short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR process. The sludge fermentation, the short-cut denitrification and the anaerobic ammonia oxidation process are coupled and applied to the biofilm process, the respective process advantages are fully combined, energy is saved, consumption is reduced, and meanwhile, deep denitrification can be realized. Short-chain fatty acid generated by sludge fermentation is used as a carbon source to reduce nitrate nitrogen generated by tail water of a sewage plant into nitrite nitrogen, ammonia nitrogen and nitrite nitrogen released by sludge fermentation are used as substrates to complete anaerobic ammonia oxidation reaction, and finally effluent is discharged after reaching the standard.
In order to achieve the aim, the device for realizing deep denitrification of the tail water of the sewage plant by the short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR process comprises a secondary sedimentation tank effluent water storage tank;
the water outlet and storage tank of the secondary sedimentation tank is connected with a first water inlet of the PDA-MBBR through a first water inlet pump;
the sludge fermentation liquid water storage tank is connected with a second water inlet of the PDA-MBBR through a second water inlet pump;
the PDA-MBBR is connected with the water inlet of the clean water tank through the water outlet;
an anoxic stirrer (3.7), a pH probe (3.8), a Dissolved Oxygen (DO) probe (3.9), an ammonia nitrogen and nitrate nitrogen online monitoring device (3.10) and an MBBR filler (3.11) are arranged in the PDA-MBBR;
and a control device is connected with the first water inlet pump, the second water inlet pump II, the anoxic stirrer, the pH probe, the Dissolved Oxygen (DO) probe and the nitrogen and nitrate nitrogen on-line monitoring device through signal wires.
Furthermore, an overflow valve is arranged on the PDA-MBBR.
In order to achieve the aim, the invention provides a method for realizing deep denitrification of tail water of a sewage plant by using a sludge fermentation liquid as a carbon source through a short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR process, which comprises the following steps: deployment of PDA-MBBR System: inoculating a biological membrane filler ball attached with anaerobic ammonium oxidation bacteria activity, wherein the sludge concentration of the anaerobic ammonium oxidation bacteria is controlled to be 200-300mgMLSS/L; the influent water adopts NO 2 - -N and NH 4 + Artificial water distribution with the mass concentration ratio of N being 1.3, wherein TN concentration is 20mg/L, nitrogen removal rate exceeds 90%, and the nitrogen removal rate is stably maintained for 20 days, and finally acclimation of anaerobic ammonia oxidation is completed; inoculating activated sludge with the concentration of 2000-4000mg/L, and adopting NO for inlet water 3 - -N and NH 4 + N and a mass concentration ratio of 14, 1-1.6, 1-1, and 15-30mg/L Total Nitrogen (TN) concentration, adding sodium acetate as a short-range denitrification carbon source, and completing the coupling of short-range denitrification anaerobic ammonia oxidation and anoxic MBBR when the TN removal rate exceeds 90% and is stably maintained for 20 days;
enabling tail water of the domestic sewage plant in the secondary sedimentation tank water storage tank to enter a PDA-MBBR system, controlling the volume ratio of the tail water of the domestic sewage plant entering the PDA-MBBR to fermentation liquor to be 12-16, wherein the mass concentration of nitrate nitrogen in the tail water of the domestic sewage plant is 10-20 mg/L, and the ratio of chemical oxygen demand to the mass concentration of nitrate nitrogen after water inlet is 2.5-3.5, and performing sludge fermentation coupling short-range denitrification/anaerobic ammonia oxidation reaction;
starting a stirring device in the PDA-MBBR system, recording the change of pH and DO, maintaining the pH value at 7.0-9.0 and the DO at 0.3-0.8mg/L, controlling the sludge concentration in the PDA-MBBR to be 2000-4000mg/L, controlling the hydraulic retention time of the PDA-MBBR to be 6-10h and the sludge retention time to be 20-30d; the treated effluent is discharged through a water outlet pipe.
The method takes fermentation liquor generated by anaerobic fermentation of sludge as a carbon source for short-range denitrification, ammonia nitrogen in the fermentation liquor and nitrite nitrogen generated by the short-range denitrification can be used as substrates of the anammox bacteria, and simultaneously, the characteristics that the anammox bacteria like the colony growth and are easy to form particles and adhere to the wall are utilized, and the in-situ enrichment of the anammox bacteria is realized by adding a filler carrier biofilm. The anaerobic ammonia oxidation reaction process of the novel autotrophic nitrogen removal process is simple, an organic carbon source is not needed, the operation cost is saved, and the combination with the short-cut denitrification can realize the deep nitrogen removal of the tail water of the sewage plant. The invention has the following advantages:
1) Anaerobic ammonia oxidizing bacteria in the PDA-MBBR utilize ammonia nitrogen to replace part of organic matters to reduce nitrite nitrogen, so that the adding amount of the organic matters is reduced;
2) Recycling of the sludge fermentation liquor promotes resource utilization of excess sludge, improves synchronous treatment efficiency of sludge and sewage, and saves treatment cost;
3) The short-range denitrifying bacteria reduce nitrate nitrogen into nitrite nitrogen by using organic acid generated by sludge fermentation, provide a substrate for anaerobic ammonium oxidation bacteria, and can effectively solve the problem that nitrite nitrogen is difficult to stably obtain in the short-range nitrification process. Meanwhile, nitrate nitrogen generated in the anaerobic ammonia oxidation process can be removed in situ to meet the requirement of deep denitrification;
4) The added porous suspended MBBR filler with large specific surface area provides an implantation carrier for the anaerobic ammonium oxidation bacteria, can effectively promote the growth and enrichment of the anaerobic ammonium oxidation bacteria, and prevents the anaerobic ammonium oxidation bacteria from running off along with the effluent.
Drawings
FIG. 1 is a diagram showing the structure of the apparatus of the present invention:
1-a water outlet storage tank of a secondary sedimentation tank, 1.1-a water inlet pump I, 2-a sludge fermentation liquor storage tank and 2.1-a water inlet pump II;
3-PDA-MBBR, 3.1-water inlet I, 3.2-water inlet II, 3.3-water outlet, 3.4-valve I, 3.5-valve II, 3.6-valve III, 3.7-anoxic stirrer, 3.8-pH probe, 3.9-Dissolved Oxygen (DO) probe, 3.10-ammonia nitrogen and nitrate nitrogen on-line monitoring device, 3.11-MBBR filler and 3.12-overflow valve;
4-clean water tank, 4.1-clean water tank water inlet, 4.2-clean water tank water outlet pipe, 5-programmable control system and 6-computer.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The invention discloses an embodiment, which comprises a secondary sedimentation tank effluent water storage tank (1), a sludge fermentation liquor water storage tank (2), a PDA-MBBR (3), a clean water tank (4), a programmable control system (5) and a computer (6); the PDA-MBBR (3) is provided with a water inlet I (3.1), a water inlet II (3.2), a water outlet (3.3), a valve I (3.4), a valve II (3.5), a valve III (3.6), an anoxic stirrer (3.7), a pH probe (3.8), a Dissolved Oxygen (DO) probe (3.9), an ammonia nitrogen and nitrate nitrogen online monitoring device (3.10) and an MBBR filler (3.11);
the water storage tank (1) at the outlet of the secondary sedimentation tank is connected with a water inlet I (3.1) of a PDA-MBBR (3) through a water inlet pump I (1.1); the sludge fermentation liquor storage water tank (2) is connected with a water inlet II (3.2) of the PDA-MBBR (3) through a water inlet pump II (2.1); the PDA-MBBR (3) is connected with a water inlet (4.1) of the clean water tank (4) through a water outlet (3.3), and finally, the outlet water is discharged through a water outlet pipe (4.2) of the clean water tank;
the built-in interface of the programmable control system (5) is respectively connected with a water inlet pump I (1.1), a water inlet pump II (2.1), an anoxic stirrer (3.7), a pH probe (3.8), a Dissolved Oxygen (DO) probe (3.9) and a nitrogen and nitrate nitrogen online monitoring device (3.10), and one end of the programmable control system is connected with a computer (6).
The experiment adopts a certain domestic sewage plant A 2 The effluent of the O process secondary sedimentation tank is used as raw water of a water storage tank (1), and the specific water quality is as follows: COD concentration is 50.0mg/L, TN concentration is 15.1mg/L, NH 4 + N concentration of 2.8mg/L, NO 2 - N concentration of 0.8mg/L, NO 3 - -N concentration 11.2mg/L;
the experiment adopts a laboratory to use the fermentation liquor obtained by anaerobic fermentation-supernatant fluid substrate elutriation of excess sludge as the raw water of the water storage tank (2), and the invention does not relate toThe anaerobic fermentation of the excess sludge-the elutriation process of the supernatant medium, the main water quality after the elutriation is as follows: COD concentration is 300mg/L, NH 4 + The concentration of N is 80mg/L. Short-chain fatty acids in fermentation liquor after sludge fermentation and elutriation provide an additional carbon source for short-range denitrification in the PDA-MBBR process, and NH in the fermentation liquor 4 + N is substrate in anaerobic ammoxidation fermentation liquid.
The test system is shown in figure 1, each reactor is made of organic glass, the inner diameter of the PDA-MBBR is 120mm, the height of the PDA-MBBR is 500mm, the total volume of the reactor is 6.00L, and the effective volume of the reactor is 5.60L.
The specific operation process is as follows:
and (3) starting a system: inoculating a biological membrane filler ball attached with anaerobic ammonium oxidation bacteria activity, controlling the sludge concentration of the anaerobic ammonium oxidation bacteria to be 200-300mgMLSS/L, adding into a PDA-MBBR system, and adopting NO as inlet water 2 - -N and NH 4 + Artificial water distribution with the mass concentration ratio of N being 1.3, wherein TN concentration is 20mg/L, nitrogen removal rate exceeds 90%, and the nitrogen removal rate is stably maintained for 20 days, and finally acclimation of anaerobic ammonia oxidation is completed; inoculating activated sludge with a concentration of 3000mg/L, and introducing NO into water 3 - -N and NH 4 + N and artificial water distribution with the mass concentration ratio of 1.5 to 1 and the Total Nitrogen (TN) concentration of 25mg/L, adding sodium acetate as a short-range denitrification carbon source, and completing the coupling of short-range denitrification anaerobic ammonia oxidation and anoxic MBBR when the TN removal rate exceeds 90% and is stably maintained for 20 days;
the system operation adjustment operation is as follows: and (2) enabling tail water of the domestic sewage plant in the secondary sedimentation tank water storage tank to enter a PDA-MBBR system, controlling the volume ratio of the tail water of the domestic sewage plant entering the PDA-MBBR to fermentation liquor to be 15mg/L, and enabling the ratio of chemical oxygen demand to the mass concentration of nitrate nitrogen after water inlet to be 2.5-3.5, and performing sludge fermentation coupling short-cut denitrification/anaerobic ammonia oxidation reaction, wherein the mass concentration of nitrate nitrogen in the tail water of the domestic sewage plant is 12 mg/L. Starting a stirring device, recording the change of pH and DO, keeping the pH value at 7.0-9.0, keeping the DO at 0.3-0.8mg/L, controlling the sludge concentration in the PDA-MBBR to be 2000-4000mg/L, controlling the hydraulic retention time of the PDA-MBBR to be 6-10h, and keeping the sludge retention time to be 20-30d; the treated effluent is discharged through a water outlet pipe.
The test result shows that: after the operation is stable, the COD concentration of the effluent of the system is 30-100mg/L, and the average concentration is 65.5mg/L; NH 4 + -N concentration is 0-3mg/L, average 1.5mg/L; NO 2 - -N concentration is 0-lmg/L, average 0.2mg/L; NO 3 - The concentration of N is 0-6mg/L, and the average is 3mg/L. Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The present invention is described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Many other changes and modifications may be made without departing from the spirit and scope of the invention and should be considered as within the scope of the invention.
The particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. The utility model provides a short distance denitrification anaerobic ammonium oxidation coupling oxygen deficiency MBBR technology realizes sewage plant tail water degree of depth denitrification device which characterized in that: comprises a water outlet and storage tank of a secondary sedimentation tank;
the water outlet and storage tank of the secondary sedimentation tank is connected with a first water inlet of the PDA-MBBR through a first water inlet pump;
the sludge fermentation liquid water storage tank is connected with a second water inlet of the PDA-MBBR through a second water inlet pump;
the PDA-MBBR is connected with the water inlet of the clean water tank through the water outlet;
an anoxic stirrer (3.7), a pH probe (3.8), a Dissolved Oxygen (DO) probe (3.9), an ammonia nitrogen and nitrate nitrogen online monitoring device (3.10) and MBBR fillers (3.11) are arranged in the PDA-MBBR;
and a control device is connected with the first water inlet pump, the second water inlet pump II, the anoxic stirrer, the pH probe, the Dissolved Oxygen (DO) probe and the nitrogen and nitrate nitrogen online monitoring device through signal wires.
2. The device for realizing deep denitrification of tail water of a sewage plant by the short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR process according to claim 1, which is characterized in that: the PDA-MBBR is provided with an overflow valve.
3. A method for realizing deep denitrification of tail water of a sewage plant by using a sludge fermentation liquid as a carbon source through a short-cut denitrification anaerobic ammonia oxidation coupled anoxic MBBR (moving bed biofilm reactor) process is characterized by comprising the following steps:
deploying the PDA-MBBR system: inoculating a biomembrane filler ball attached with anaerobic ammonium oxidation bacteria activity, wherein the sludge concentration of the anaerobic ammonium oxidation bacteria is controlled to be 200-300mgMLSS/L; the inlet water adopts NO 2 - -N and NH 4 + Artificial water distribution with the mass concentration ratio of N being 1.3, wherein TN concentration is 20mg/L, nitrogen removal rate exceeds 90%, and the nitrogen removal rate is stably maintained for 20 days, and finally acclimation of anaerobic ammonia oxidation is completed; inoculating activated sludge with the concentration of 2000-4000mg/L, and adopting NO for inlet water 3 - -N and NH 4 + N and artificial water distribution with the mass concentration ratio of 1.4-1.6 and the Total Nitrogen (TN) concentration of 15-30mg/L, adding sodium acetate as a short-range denitrification carbon source, and completing the coupling of short-range denitrification anaerobic ammonia oxidation and anoxic MBBR when the TN removal rate exceeds 90% and is stably maintained for 20 days;
enabling tail water of the domestic sewage plant in the secondary sedimentation tank water storage tank to enter a PDA-MBBR system, controlling the volume ratio of the tail water of the domestic sewage plant entering the PDA-MBBR to fermentation liquor to be 12-16, wherein the mass concentration of nitrate nitrogen in the tail water of the domestic sewage plant is 10-20 mg/L, and the ratio of chemical oxygen demand to the mass concentration of nitrate nitrogen after water inlet is 2.5-3.5, and performing sludge fermentation coupling short-range denitrification/anaerobic ammonia oxidation reaction;
starting a stirring device in the PDA-MBBR system, recording the change of pH and DO, maintaining the pH value at 7.0-9.0 and the DO at 0.3-0.8mg/L, controlling the sludge concentration in the PDA-MBBR to be 2000-4000mg/L, controlling the hydraulic retention time of the PDA-MBBR to be 6-10h and the sludge retention time to be 20-30d; the treated effluent is discharged through a water outlet pipe.
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