CN115745165A - Device and method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation - Google Patents
Device and method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 63
- 230000003647 oxidation Effects 0.000 title claims abstract description 60
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 60
- 239000011593 sulfur Substances 0.000 title claims abstract description 57
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 56
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 52
- 239000010865 sewage Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 144
- 238000005273 aeration Methods 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 230000002572 peristaltic effect Effects 0.000 claims description 30
- 239000010802 sludge Substances 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 23
- 238000012806 monitoring device Methods 0.000 claims description 12
- 239000003344 environmental pollutant Substances 0.000 claims description 9
- 231100000719 pollutant Toxicity 0.000 claims description 9
- 239000006228 supernatant Substances 0.000 claims description 9
- 241000894006 Bacteria Species 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 8
- 238000011081 inoculation Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010842 industrial wastewater Substances 0.000 claims description 3
- 230000001546 nitrifying effect Effects 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000149 chemical water pollutant Substances 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 7
- 230000001376 precipitating effect Effects 0.000 description 4
- 241001453382 Nitrosomonadales Species 0.000 description 2
- 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 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 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 1
- 239000000370 acceptor Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
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- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 sulfur ions Chemical class 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
A device and a method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation belong to the field of biological sewage treatment. The nitrification/denitrification reactor adopts an anoxic and aerobic operation mode, and the water discharge ratio is 70 percent; in the anoxic stage, organic carbon source in the inlet water is first consumed by denitrification for removing residual NO in the upper-period reactor 3 ‑ N, draining to an intermediate water tank at a drainage ratio of 35% after the anoxic stirring is finished; aerobic stage, residual NH in reactor 4 + Total oxidation of-N to NO 3 ‑ And N, after aeration is finished, draining to an intermediate water tank at a drainage ratio of 35%. According to actual NO 3 ‑ Adding proper amount of S at-N concentration 2‑ Control of S/NO 3 ‑ The mass ratio of-N is 0.57-0.9. Will subsequently contain NH 4 + ‑N、NO 3 ‑ -N and S 2‑ Introducing the sewage in the intermediate water tank into a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor, and performing denitrification treatment on the sewage in the intermediate water tank 2‑ Is NO under the condition of electron donor 3 ‑ -N is first reduced to NO by sulfur autotrophic short-cut denitrification 2 ‑ -N, NO produced 2 ‑ -N and remaining NH 4 + The synchronous removal of-N by anammox to N 2 。
Description
Technical Field
The invention relates to a device and a method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation, belonging to the technical field of biological denitrification of domestic sewage.
Background
The strict control of the nitrogen content in the effluent of the municipal sewage treatment plant is an important measure for avoiding the eutrophication problem of the water body. The urban sewage denitrification technology mainly based on 'full-process nitrification-denitrification' is mainly realized by the combined action of Ammonia Oxidizing Bacteria (AOB), nitrite Oxidizing Bacteria (NOB) and heterotrophic denitrifying bacteria, the aeration energy consumption in the nitrification stage accounts for about 40-50% of the total energy consumption of a sewage treatment plant, and the denitrification stage needs organic matters in sewage as electron donors and even needs to be added with carbon sources. Although the technology of 'full-course nitrification-denitrification' is proved to be a stable denitrification mode in practice, the process energy consumption is huge, and the requirement of sustainable development is not met. How to realize stable and low-consumption nitrogen removal is a key and difficult point of future research in the field of biological denitrification of municipal sewage.
NH 4 + +1.82O 2 +1.98HCO 3 - →0.021C 5 H 7 O 2 N+0.98NO 3 - +1.041H 2 O+1.88H 2 CO 3 (1)
NO 3 - +1.08CH 3 OH+0.24H 2 CO 3 →0.056C 5 H 7 NO 2 +0.47N 2 +1.68H 2 O+HCO 3 - (2)
Under the background of global energy crisis and resource shortage, the functions of sewage treatment plants are not only pollutant removal, but also the principles of sustainability, low carbon and emission reduction are emphasized, and even the functions are used as important carriers for energy recovery and output. Therefore, breaking through the technical bottleneck of sewage treatment and innovating a biological denitrification theory to improve the pollutant removal efficiency, reduce the operation energy consumption and reduce the negative impact on the environment to the greatest extent is an important task for the development and innovation of the sewage treatment technology at the present stage.
As a novel autotrophic biological nitrogen removal technology, the anaerobic ammonia oxidation can directly remove NH 4 + -N and NO 2 - Conversion of-N to N 2 The technology is considered to be the most economic and environment-friendly sewage denitrification technology with potential of biological energy recovery, and is suitable for urban domestic sewage with low C/N ratio. But every 1mol of NH removed during anammox 4 + N will be metabolized to produce 0.26mol NO 3 - Accumulation of large amounts of NO in the anammox effluent 3 - N is the main reason for the substandard effluent. The short-cut denitrification process can effectively solve the problem of high nitrate nitrogen in the effluent of anaerobic ammonia oxidation, and particularly, the sulfur autotrophic short-cut denitrification taking sulfur ions as electron acceptors has obvious advantages in treating the nitrate nitrogen generated by anaerobic ammonia oxidation metabolism: (1) organic carbon sources are not needed, so that the treatment cost and the secondary pollution risk are reduced; (2) the sludge yield is extremely low, and the residual sludge yield is reduced to the maximum extent. The invention provides a device and a method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation for the first time, which are used for realizing deep denitrification treatment of urban domestic sewage.
Disclosure of Invention
The invention provides a device and a method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation, and belongs to the technical field of biological denitrification of domestic sewage. The nitrification/denitrification reactor adopts an anoxic and aerobic operation mode, and the water discharge ratio is 70 percent; in the anoxic stage, organic carbon source in the inlet water is first consumed by denitrification for removing residual NO in the upper-period reactor 3 - N, precipitating for 15min after the anoxic stirring is finished, and draining to an intermediate water tank at a drainage ratio of 35%; aerobic stage, residual NH in reactor 4 + Total oxidation of-N to NO 3 - And (4) -N, precipitating for 15min after the aeration is finished, and draining to an intermediate water tank at a drainage ratio of 35%. According to actual NO 3 - Adding proper amount of S at-N concentration 2- Control of S/NO 3 - -N mass ratio of 0.57-0.9. Will subsequently contain NH 4 + -N、NO 3 - -N and S 2- Introducing the sewage in the intermediate water tank into a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor, and performing denitrification treatment on the sewage in the intermediate water tank 2- Is NO under the condition of electron donor 3 - N is first reduced to N by sulfur autotrophic short-cut denitrificationNO 2 - -N, NO produced 2 - -N and remaining NH 4 + The N is synchronously removed and converted into N by anaerobic ammonia oxidation 2 And the deep denitrification treatment of the domestic sewage is realized.
The purpose of the invention is realized by the following technical scheme:
the device and the method for enhancing the deep denitrification of the domestic sewage by the coupling of nitrification/denitrification and sulfur autotrophic denitrification/anaerobic ammonia oxidation are characterized by comprising a raw water tank (1), a nitrification/denitrification reactor (2), an intermediate water tank (3), a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor (4), an effluent water tank (5) and an automatic control system (6);
the water inlet tank (1) is provided with a first water outlet (1.1); the nitrification/denitrification reactor (2) is provided with a first stirrer (2.1), a first online monitoring device (2.2), a first water inlet peristaltic pump (2.3), a first water inlet (2.4), an air compressor (2.5), an aeration sand head (2.6), a second water outlet (2.7) and a first water outlet peristaltic pump (2.8); the middle water tank (3) is provided with a second water inlet (3.1) and a third water outlet (3.2); the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor (4) is provided with a second stirrer (4.1), a third water inlet (4.2), a second water inlet peristaltic pump (4.3), a second water outlet peristaltic pump (4.4), a fourth water outlet (4.5) and a second online monitoring device (4.6); the water outlet tank (5) is provided with a fourth water inlet (5.1)
A first water outlet (1.1) of the water inlet tank (1) is connected with a first water inlet (2.4) of the shortcut nitrification/anaerobic ammonia oxidation reactor (2) through a first water inlet peristaltic pump (2.3); air is pumped into the nitrification/denitrification reactor (2) through an air compressor (2.5) and an aeration sand head (2.6); a second water outlet (2.7) of the nitrification/denitrification reactor (2) is connected with a second water inlet (3.1) of the middle water tank (3) through a first water outlet peristaltic pump (2.8); a third water outlet (3.2) of the middle water tank is connected with a third water inlet (4.2) of the sulfur autotrophic short-range denitrification/anaerobic ammonia oxidation reactor (4) through a second water inlet peristaltic pump (4.3), and a fourth water outlet (4.5) of the sulfur autotrophic short-range denitrification/anaerobic ammonia oxidation reactor (4) is connected with a fourth water inlet (5.1) of the water outlet water tank (5) through a second water outlet peristaltic pump (4.4).
The method for realizing deep denitrification of domestic sewage by using the device is characterized by comprising the following steps:
1) Urban sewage plant A 2 Inoculating residual sludge discharged from a secondary sedimentation tank in the/O process to a nitrification/denitrification reactor, wherein the sludge concentration in the reactor after inoculation is 3261 +/-534 mg/L; anaerobic ammonia oxidation activated sludge for treating municipal sewage and treatment S 2- Inoculating activated sludge of the industrial wastewater into a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor according to a volume ratio of 7:3, wherein the sludge concentration in the reactor after inoculation is 3765 +/-423 mg/L;
2) The domestic sewage in the water inlet tank is completely pumped to the nitrification/denitrification reactor through the first water inlet peristaltic pump, the first stirrer is started, and the denitrifying bacteria in the reactor utilize COD in the inlet water to remove residual NO in the previous period 3 - Reduction and removal of-N, and the reactor only contains a pollutant NH after the stirring is finished 4 + N, settling for 15min, and discharging the supernatant in the reactor to an intermediate water tank at a drainage ratio of 35%;
3) Opening an air compressor, and under the aerobic condition that the dissolved oxygen concentration is 1.5-2.0mg/L, nitrifying bacteria react NH 4 + Oxidation of-N to NO 3 - N, the nitrification/denitrification reactor only contains the pollutant NO after the aeration period 3 - -N, settling for 15min, draining the supernatant to the intermediate tank at 35% drain ratio;
4) The anoxic stirring and aeration time of the nitrification/denitrification reactor are controlled in real time by adopting a pH on-line monitoring device; denitrification is a process for generating alkalinity, and stirring is stopped when a pH curve does not rise any more in an anoxic stage; in the aeration stage, when the first derivative of the pH value is-0.1, the aeration and the stirring are stopped;
5) According to NO in the intermediate tank 3 - S is added at-N concentration 2- Control of S/NO 3 - The mass ratio of-N is 0.57-0.9. Opening a second water inlet peristaltic pump to contain NH 4 + -N、NO 3 - -N and S 2- Pumping the wastewater into a sulfur autotrophic denitrification reactor, and performing sulfur autotrophic denitrification on S 2- NO as Electron Donor 3 - Reduction of NO by-N 2 - -N, NO produced 2 - N and NH remaining in the reactor 4 + -N is subsequently removed simultaneously by anammox, converted to N 2 ；
6) The sulfur autotrophic short-cut denitrification is an alkalinity consumption process, the anaerobic ammonia oxidation is an alkalinity generation process, the anoxic stirring time of the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor is strictly controlled by a pH implementation monitoring device, when the first derivative of a pH curve is between-0.1 and 0.1, the second stirrer is closed, and supernatant is discharged after 15min of precipitation;
the hydraulic retention time of the nitrification/denitrification reactor in the step 2) in the operation process is 4.3h, the drainage ratio is 70 percent, and the sludge age is 15-20 days;
in the step 5), the hydraulic retention time of the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor in the operation process is 5-6h, the drainage ratio is 70%, and the sludge age is 45-60 days.
Principle of the technology
The invention discloses a device and a method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation, and belongs to the technical field of biological denitrification of domestic sewage. The nitrification/denitrification reactor adopts an anoxic and aerobic operation mode, and the water discharge ratio is 70 percent; in the anoxic stage, organic carbon source in the inlet water is first consumed by denitrification for removing residual NO in the upper-period reactor 3 - N, precipitating for 15min after the anoxic stirring is finished, and draining to an intermediate water tank at a drainage ratio of 35%; aerobic stage, residual NH in reactor 4 + Total oxidation of-N to NO 3 - And (N), precipitating for 15min after aeration is finished, and draining to an intermediate water tank at a drainage ratio of 35%. According to actual NO 3 - Adding a proper amount of S to the concentration of-N 2- Control of S/NO 3 - -N mass ratio of 0.57-0.9. Will subsequently contain NH 4 + -N、NO 3 - -N and S 2- Introducing the sewage in the intermediate water tank into a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor, and performing denitrification treatment on the sewage in the intermediate water tank 2- Is NO under the condition of electron donor 3 - -N is first reduced to NO by sulfur autotrophic short-cut denitrification 2 - -N, generatedNO 2 - -N and remaining NH 4 + The synchronous removal of-N by anammox to N 2 And the deep denitrification treatment of the domestic sewage is realized.
The device and the method for enhancing the deep denitrification of the domestic sewage by the coupling of the nitrification/denitrification and the sulfur autotrophic denitrification/anaerobic ammonia oxidation have the following advantages:
1) By organically combining nitrification, denitrification, sulfur autotrophic denitrification and anaerobic ammonia oxidation, the advanced denitrification treatment of the municipal domestic sewage without adding an external carbon source is realized in the true sense, and the sewage treatment cost and the secondary pollution risk caused by adding organic matters are reduced;
2) The anoxic stage of the nitrification/denitrification reactor fully utilizes the influent organic carbon source to remove the residual NO in the upper-period reactor 3 - Reduction of-N to N 2 The denitrification efficiency of the system is improved, and the excess sludge proliferation caused by the utilization of the organic carbon source by the growth and the propagation of microorganisms is reduced to the maximum extent;
3) After the anoxic stirring stage, the nitrification/denitrification reactor is discharged to an intermediate water tank (accounting for 50 percent of the inflow domestic sewage) at a drainage ratio of 35 percent, and the aeration stage only needs to discharge NH in 50 percent of inflow water 4 + Oxidation of-N to NO 3 - -N. Therefore, compared with the traditional biological denitrification technology, the method saves 50 percent of aeration energy consumption;
4) Under the synergistic effect of sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation, NH discharged after the anoxic stirring of the nitrification/denitrification reactor is finished can be removed simultaneously 4 + -N and NO produced during the aeration phase 3 - -N. At the same time, anaerobic ammonia oxidizes NO produced by its own metabolism 3 - the-N is reduced to NO by sulfur autotrophic denitrification 2 - N, utilized in situ by anammox, which theoretically could achieve 100% denitrification efficiency.
5) The reaction time of the shortcut nitrification/anaerobic ammonia oxidation reactor and the sulfur autotrophic denitrification reactor is controlled in real time through a pH curve, so that unnecessary energy consumption is avoided, the optimal distribution of the reaction time is completed, and meanwhile, when the quality and the quantity of inlet water are changed, the stable operation of the system can be still ensured, and the high-efficiency removal of nitrogen-containing pollutants in the late-stage landfill leachate is realized;
drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Detailed Description
The present invention is described in further detail below with reference to fig. 1 and the following detailed description.
As shown in fig. 1, the device and the method for enhancing deep denitrification of domestic sewage by coupling nitrification/denitrification with sulfur autotrophic denitrification/anaerobic ammonia oxidation comprise a raw water tank (1), a nitrification/denitrification reactor (2), an intermediate water tank (3), a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor (4), an effluent water tank (5) and an automatic control system (6);
the water inlet tank (1) is provided with a first water outlet (1.1); the nitrification/denitrification reactor (2) is provided with a first stirrer (2.1), a first online monitoring device (2.2), a first water inlet peristaltic pump (2.3), a first water inlet (2.4), an air compressor (2.5), an aeration sand head (2.6), a second water outlet (2.7) and a first water outlet peristaltic pump (2.8); the middle water tank (3) is provided with a second water inlet (3.1) and a third water outlet (3.2); the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor (4) is provided with a second stirrer (4.1), a third water inlet (4.2), a second water inlet peristaltic pump (4.3), a second water outlet peristaltic pump (4.4), a fourth water outlet (4.5) and a second online monitoring device (4.6); the water outlet tank (5) is provided with a fourth water inlet (5.1)
A first water outlet (1.1) of the water inlet tank (1) is connected with a first water inlet (2.4) of the shortcut nitrification/anaerobic ammonia oxidation reactor (2) through a first water inlet peristaltic pump (2.3); air is pumped into the nitrification/denitrification reactor (2) through an air compressor (2.5) and an aeration sand head (2.6); a second water outlet (2.7) of the nitrification/denitrification reactor (2) is connected with a second water inlet (3.1) of the middle water tank (3) through a first water outlet peristaltic pump (2.8); a third water outlet (3.2) of the middle water tank is connected with a third water inlet (4.2) of the sulfur autotrophic short-range denitrification/anaerobic ammonia oxidation reactor (4) through a second water inlet peristaltic pump (4.3), and a fourth water outlet (4.5) of the sulfur autotrophic short-range denitrification/anaerobic ammonia oxidation reactor (4) is connected with a fourth water inlet (5.1) of the water outlet water tank (5) through a second water outlet peristaltic pump (4.4).
The water used for the test in this example is actual urban domestic sewage, the average concentration of ammonia nitrogen is 28.3 + -43.6 mg/L, the COD concentration is 174.2-286.6mg/L, the concentration of nitrite nitrogen is 0.11-0.4mg/L, the test reactors are sequencing batch SBR, the effective volume is 10L, and the drainage ratio is 70%.
The specific operation process is as follows:
1) Urban sewage plant A 2 Inoculating residual sludge discharged from a secondary sedimentation tank in the/O process to a nitrification/denitrification reactor, wherein the sludge concentration in the reactor after inoculation is 3261 +/-534 mg/L; treating the anaerobic ammonium oxidation activated sludge of urban sewage and treating S 2- Inoculating activated sludge of the industrial wastewater into a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor according to a volume ratio of 7:3, wherein the sludge concentration in the reactor after inoculation is 3765 +/-423 mg/L;
2) The domestic sewage in the water inlet tank is completely pumped to the nitrification/denitrification reactor through the first water inlet peristaltic pump, the first stirrer is started, and the denitrifying bacteria in the reactor utilize COD in the inlet water to remove residual NO in the previous period 3 - Reduction and removal of-N, and the reactor only contains a pollutant NH after the stirring is finished 4 + N, settling for 15min, and discharging the supernatant in the reactor to an intermediate water tank at a drainage ratio of 35%;
3) Opening an air compressor, and under the aerobic condition that the dissolved oxygen concentration is 1.5-2.0mg/L, nitrifying bacteria react NH 4 + Oxidation of-N to NO 3 - N, the nitrification/denitrification reactor only contains the pollutant NO after the aeration period 3 - -N, settling for 15min, draining the supernatant to the intermediate tank at 35% drain ratio;
4) The anoxic stirring and aeration time of the nitrification/denitrification reactor are controlled in real time by adopting a pH on-line monitoring device; denitrification is a process of generating alkalinity, and stirring is stopped when a pH curve does not rise any more in an anoxic stage; in the aeration stage, when the pH value is not changed obviously any more or the first derivative is-0.1, the aeration and the stirring are stopped;
5) According to NO in the intermediate tank 3 - Concentration of-NAdding S 2- Control of S/NO 3 - The mass ratio of-N is 0.57-0.9. Opening a second water inlet peristaltic pump to contain NH 4 + -N、NO 3 - -N and S 2- Pumping the wastewater into a sulfur autotrophic denitrification reactor, and performing sulfur autotrophic denitrification on S 2- First NO as an electron donor 3 - Reduction of NO by-N 2 - -N, NO produced 2 - N and NH remaining in the reactor 4 + -N is subsequently removed simultaneously by anammox, converted to N 2 ；
6) The sulfur autotrophic short-cut denitrification is an alkalinity consumption process, the anaerobic ammonia oxidation is an alkalinity generation process, the anoxic stirring time of the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor is strictly controlled by a pH monitoring device, when the pH curve tends to be flat and the first derivative is between-0.1 and 0.1, the second stirrer is closed, and the supernatant is discharged after 15min of precipitation;
the hydraulic retention time of the nitrification/denitrification reactor in the step 2) in the operation process is 4.3h, the drainage ratio is 70 percent, and the sludge age is 15-20 days;
in the step 5), the hydraulic retention time of the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor in the operation process is 5-6h, the drainage ratio is 70%, and the sludge age is 45-60 days.
The results of successive experiments show that:
the process has the total nitrogen removal rate of 96.1 percent under the conditions that the concentrations of the ammonia nitrogen, the total nitrogen and the COD in the inlet water are respectively 28.3 +/-43.6 mg/L,53.2-71.4mg/L and 174.2-286.6 mg/L. Ectopic active batch experiments show that sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation is a two-step biochemical reaction taking sulfur simple substances as intermediate metabolites. First step, S 2- Is oxidized into S 0 (13.3 mg S/g VSS.h), and the denitrification rate is 5.1mg N/g VSS.h along with the rapid sulfur autotrophic denitrification process; in the second step, anammox is the main denitrification way, and the denitrification rate is 2.0mg N/g VSS.h. Compared with the traditional biological denitrification technology, the nitrification/denitrification-sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation saves 100 percent of organic carbon source demand, reduces 50 percent of aeration energy consumption, and reduces the output of the excess sludge69.9 percent less, and has obvious economic and environmental advantages.
Claims (2)
1. The device for enhancing the deep denitrification of the domestic sewage by the coupling of nitrification/denitrification and sulfur autotrophic denitrification/anaerobic ammonia oxidation is characterized by comprising a raw water tank (1), a nitrification/denitrification reactor (2), an intermediate water tank (3), a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor (4), a water outlet tank (5) and an automatic control system (6);
the water inlet tank (1) is provided with a first water outlet (1.1); the nitrification/denitrification reactor (2) is provided with a first stirrer (2.1), a first online monitoring device (2.2), a first water inlet peristaltic pump (2.3), a first water inlet (2.4), an air compressor (2.5), an aeration sand head (2.6), a second water outlet (2.7) and a first water outlet peristaltic pump (2.8); the middle water tank (3) is provided with a second water inlet (3.1) and a third water outlet (3.2); the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor (4) is provided with a second stirrer (4.1), a third water inlet (4.2), a second water inlet peristaltic pump (4.3), a second water outlet peristaltic pump (4.4), a fourth water outlet (4.5) and a second online monitoring device (4.6); the water outlet tank (5) is provided with a fourth water inlet (5.1);
a first water outlet (1.1) of the water inlet tank (1) is connected with a first water inlet (2.4) of the shortcut nitrification/anaerobic ammonia oxidation reactor (2) through a first water inlet peristaltic pump (2.3); air is pumped into the nitrification/denitrification reactor (2) through an air compressor (2.5) and an aeration sand head (2.6); a second water outlet (2.7) of the nitrification/denitrification reactor (2) is connected with a second water inlet (3.1) of the middle water tank (3) through a first water outlet peristaltic pump (2.8); a third water outlet (3.2) of the middle water tank is connected with a third water inlet (4.2) of the sulfur autotrophic short-range denitrification/anaerobic ammonia oxidation reactor (4) through a second water inlet peristaltic pump (4.3), and a fourth water outlet (4.5) of the sulfur autotrophic short-range denitrification/anaerobic ammonia oxidation reactor (4) is connected with a fourth water inlet (5.1) of the water outlet water tank (5) through a second water outlet peristaltic pump (4.4).
2. The method for realizing advanced denitrification of the landfill leachate by using the device of claim 1 is characterized by comprising the following steps of:
1) City (W.E.)Municipal sewage plant A 2 Inoculating residual sludge discharged from the second sedimentation tank in the/O process to a nitrification/denitrification reactor, wherein the sludge concentration in the reactor after inoculation is 3261 +/-534 mg/L; treating the anaerobic ammonium oxidation activated sludge of urban sewage and treating S 2- Inoculating activated sludge of the industrial wastewater into a sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor according to a volume ratio of 7:3, wherein the sludge concentration in the reactor after inoculation is 3765 +/-423 mg/L;
2) The domestic sewage in the water inlet tank is completely pumped to the nitrification/denitrification reactor through the first water inlet peristaltic pump, the first stirrer is started, and the denitrification bacteria in the reactor utilize the organic carbon source in the inlet water to remove the residual NO in the previous period 3 - Reduction and removal of-N, and the reactor only contains a pollutant NH after the stirring is finished 4 + N, settling for 15min, and discharging the supernatant in the reactor to an intermediate water tank at a drainage ratio of 35%;
3) Opening an air compressor, and under the aerobic condition that the dissolved oxygen concentration is 1.5-2.0mg/L, nitrifying bacteria react NH 4 + Oxidation of-N to NO 3 - N, the nitrification/denitrification reactor only contains the pollutant NO after the aeration period 3 - -N, settling for 15min, draining the supernatant to the intermediate tank at 35% drain ratio;
4) The anoxic stirring and aeration time of the nitrification/denitrification reactor are controlled in real time by adopting a pH on-line monitoring device; denitrification is a process of generating alkalinity, and stirring is stopped when a pH curve does not rise any more in an anoxic stage; in the aeration stage, when the first derivative of the pH value is-0.1, the aeration and the stirring are stopped;
5) According to NO in the intermediate tank 3 - S is added at-N concentration 2- Control of S/NO 3 - -N mass ratio of 0.57-0.9; opening a second water inlet peristaltic pump to contain NH 4 + -N、NO 3 - -N and S 2- Pumping the wastewater into a sulfur autotrophic denitrification reactor, and performing sulfur autotrophic denitrification on S 2- First NO as an electron donor 3 - Reduction of NO by-N 2 - -N, NO produced 3 - N and NH remaining in the reactor 4 + The N is subsequently oxidized by anaerobic ammoniaSynchronous removal, conversion to N 2 ；
6) The sulfur autotrophic short-cut denitrification is an alkalinity consumption process, the anaerobic ammonia oxidation is an alkalinity generation process, the anoxic stirring time of the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor is strictly controlled by a pH implementation monitoring device, when the first-order derivative of the pH value is between-0.1 and 0.1, the second stirrer is closed, and the supernatant is discharged after 15min of precipitation;
the hydraulic retention time of the nitrification/denitrification reactor in the step 2) in the operation process is 4.3h, the drainage ratio is 70 percent, and the sludge age is 15-20 days;
in the step 5), the hydraulic retention time of the sulfur autotrophic short-cut denitrification/anaerobic ammonia oxidation reactor in the operation process is 5-6h, the drainage ratio is 70%, and the sludge age is 45-60 days.
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| CN112250180A (en) * | 2020-09-24 | 2021-01-22 | 北京工业大学 | Device and method for realizing deep denitrification of domestic sewage by coupling half-shortcut nitrification-anaerobic ammonia oxidation with sulfur autotrophic denitrification |
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| CN114772725A (en) * | 2022-03-10 | 2022-07-22 | 北京工业大学 | Device and method for enhancing nitrogen and phosphorus removal of domestic sewage by coupling sulfur autotrophic short-cut denitrification with anaerobic ammonia oxidation |
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| CN112250180A (en) * | 2020-09-24 | 2021-01-22 | 北京工业大学 | Device and method for realizing deep denitrification of domestic sewage by coupling half-shortcut nitrification-anaerobic ammonia oxidation with sulfur autotrophic denitrification |
| WO2022062615A1 (en) * | 2020-09-24 | 2022-03-31 | 北京工业大学 | Device and method for implementing deep denitrogenation of domestic sewage by half shortcut nitrification-anaerobic ammonium oxidation coupled sulfur autotrophic denitrification |
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