CN110818085A - Urban sewage nitrosation method based on ultraviolet assistance - Google Patents
Urban sewage nitrosation method based on ultraviolet assistance Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000009935 nitrosation Effects 0.000 title claims abstract description 33
- 238000007034 nitrosation reaction Methods 0.000 title claims abstract description 33
- 239000010802 sludge Substances 0.000 claims abstract description 45
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- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 17
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000012163 sequencing technique Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 8
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
- C02F3/325—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae as symbiotic combination of algae and bacteria
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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
-
- 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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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Abstract
The invention discloses an ultraviolet-assisted urban sewage nitrosation method. The method comprises the following steps: (1) adding inoculated sludge into the reactor, and performing acclimatization culture on the inoculated sludge; (2) irradiating sludge in the reactor by ultraviolet rays in UVA waveband, introducing pretreated urban sewage into the reactor, and controlling the following technological parameters: the concentration of dissolved oxygen, hydraulic retention time, sludge age, pH value and temperature in the reactor are monitored every day, and the concentration of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the effluent of the reactor is monitored every day. The UVA waveband ultraviolet rays are utilized to promote the growth of microalgae in the reactor, active oxygen is released in the photosynthesis process, Nitrite Oxidizing Bacteria (NOB) in the reactor are further killed, nitrite nitrogen cannot be further converted into nitrate nitrogen, nitrite nitrogen accumulation in the reactor is caused, and urban sewage nitrosation is achieved.
Description
Technical Field
The invention belongs to the technical field of biological sewage treatment, and particularly relates to an ultraviolet-assisted urban sewage nitrosation method.
Background
Nitrogen is one of main indexes for reducing emission of pollutants in water in China and is also an important control project for pollutant emission of municipal wastewater treatment plants. The traditional nitrification and denitrification process is an effective sewage denitrification process and is a main denitrification technology of the current sewage treatment plant. However, the defects of high energy consumption and high consumption of the traditional nitrification and denitrification process are increasingly highlighted nowadays when the global general advocated sustainable development. With the continuous breakthrough of microbiology, novel biological denitrification technologies with high efficiency and low consumption, such as short-cut nitrification and denitrification, nitrosation-anaerobic ammonia oxidation and the like, become research hotspots in the field of sewage denitrification.
The nitrosation technology plays an important role in a novel biological denitrification process, both a short-cut nitrification denitrification process and a nitrosation-anaerobic ammonia oxidation process need a nitrosation process, and the efficiency and stability of nitrosation are directly related to the treatment effect of the whole process flow. Therefore, the nitrosation technology has become one of the key technologies of the novel sewage biological denitrification process.
The nitrosation technology is characterized in that the growth or activity of nitrifying bacteria is selectively inhibited, so that the ammonia nitrogen oxidation process stays at a nitrite stage, and the accumulation of nitrite is realized. At present, the methods for selectively inhibiting nitrifying bacteria without affecting nitrosobacteria mainly comprise: controlling high temperature condition, controlling low dissolved oxygen, controlling free ammonia or free nitrous acid inhibition, controlling periodic aerobic-anoxic alternation, and the like.
The SHARON reactor developed based on the control of high temperature conditions has been successfully applied to high temperature wastewater such as sludge digestion supernatant, and has great limitation on normal temperature (even low temperature) and large flow urban sewage, and the energy consumption is also high.
The nitrite accumulation can be better realized in a short period by controlling low dissolved oxygen or periodic aerobic-anoxic alternation, but the nitrifying bacteria can generate adaptability to the low dissolved oxygen or periodic aerobic-anoxic alternation environment in the long-term operation, thereby causing the failure of the nitrosation process.
For urban sewage with low ammonia nitrogen concentration, additional ammonia or nitrous acid is needed for controlling the inhibition of free ammonia or free nitrous acid, the cost is high, and the development concept of low consumption and low energy consumption is not met. Although free ammonia or free nitrous acid in mainstream municipal sewage can be supplemented by sidestream high ammonia nitrogen wastewater (mainly sludge digestion supernatant), most sewage treatment plants do not have a sludge digestion process, so the method is relatively limited in application and difficult to popularize.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art and solve the problem that the nitrosation process of the municipal sewage with normal temperature, large flow and low ammonia nitrogen concentration is difficult to realize stably, the invention aims to provide an ultraviolet-assisted municipal sewage nitrosation method.
The purpose of the invention is realized by the following technical scheme:
an ultraviolet-assisted urban sewage nitrosation method is characterized by comprising the following steps:
(1) adding inoculated sludge into the reactor, and performing acclimatization culture on the inoculated sludge;
(2) irradiating sludge in the reactor by ultraviolet rays in UVA waveband, introducing pretreated urban sewage into the reactor, and controlling the following technological parameters: the concentration of dissolved oxygen in the reactor is 2-7 mg/L, the hydraulic retention time is 8-48 h, the sludge age is 15-40 days, the pH value is 7.5-8.5, the temperature is 15-35 ℃, and the concentrations of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the effluent of the reactor are monitored every day.
Preferably, the wavelength of the ultraviolet radiation in the step (2) is 320 nm-420 nm.
Preferably, the UVA band ultraviolet ray in the step (2) is from a mercury lamp or an ultraviolet light emitting diode, and the ultraviolet irradiance is 1000-2000 mu W/cm2And the power of an ultraviolet lamp of the reactor in unit volume is 2-6W.
Preferably, the pretreated municipal sewage in the step (2) is the municipal sewage subjected to primary treatment (grid-grit chamber), wherein the Chemical Oxygen Demand (COD) is 50-500 mg/L, the ammonia nitrogen concentration is 20-50 mg N/L, the pH value is 7.0-9.0, and the alkalinity is CaCO3Calculated) is 50-500 mg/L.
Preferably, the concentration of the sludge in the step (2) is 1000-2000 mg VSS/L.
Preferably, the pH value of the reactor system in the step (2) is 7.8-8.5, and the accumulation rate of nitrite in the effluent of the reactor can be 80-100%.
Preferably, the pH value of the reactor system in the step (2) is controlled to be 7.5-7.7, so that the accumulation rate of nitrite in the effluent of the reactor is 50-60%.
Preferably, the reactor in step (1) is a sequencing batch reactor or a continuous reactor, and more preferably is a membrane bioreactor in the continuous reactor.
Preferably, the acclimatization culture in step (1) is a continuous culture method or a batch culture method.
Preferably, the acclimatization culture in the step (1) is a continuous culture method, which specifically comprises: and (3) adding inoculated sludge, aerating for 1-2 days, continuously culturing the pretreated urban sewage, controlling the concentration of dissolved oxygen in the reactor to be 2-7 mg/L and the temperature to be 15-35 ℃ until the ammonia nitrogen removal rate of the effluent exceeds 90%, and marking successful acclimatization culture of the inoculated sludge.
Preferably, the inoculated sludge in the step (1) is activated sludge with biological denitrification function, preferably aeration tank activated sludge or secondary sedimentation tank excess sludge, and more preferably aeration tank activated sludge.
In the present invention, the nitrite accumulation rate is 100% per [ nitrite nitrogen ]/([ nitrite nitrogen ] + [ nitrate nitrogen ]).
Under normal conditions, the pH value of a reactor system is 7.8-8.5, the accumulation rate of nitrite in outlet water of the reactor is 80-100%, and when the pH value of the reactor system is controlled to be 7.5-7.7, the accumulation rate of nitrite in outlet water of the reactor is reduced to 50-60%, namely the mass ratio of the ammonia nitrogen in outlet water of the reactor to the nitrite nitrogen is 1: 1-1: 1.3, so that the nitrite can be used as inlet water of a subsequent anaerobic ammonia oxidation unit.
The innovation of the invention is as follows: according to the invention, UVA waveband ultraviolet rays are utilized to promote the growth of microalgae in the reactor, active oxygen is released in the photosynthesis process, and Nitrite Oxidizing Bacteria (NOB) in the reactor are further killed, so that nitrite nitrogen cannot be further converted into nitrate nitrogen, nitrite nitrogen is accumulated in the reactor, and the nitrosation of urban sewage is realized.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides a method for realizing the nitrosation of the urban sewage, which is efficient, stable, suitable for normal temperature, low in ammonia nitrogen concentration and high in flow, simple in operation method and free from introducing other chemical agents.
(2) The process control parameters adopted by the method are conventional monitoring parameters of the sewage treatment plant, expensive water quality monitoring equipment and sensors are not needed, in addition, the control range of the process parameters is wider, the requirements on the automation degree and the refinement degree are not high, and the method is an economic, effective and easily-controlled method for realizing the nitrosation of the municipal sewage.
(3) The method for controlling the pH value of the muddy water mixed liquid in the reactor can realize effective control of the accumulation rate of the nitrite in the effluent of the reactor so as to adapt to the water inlet requirements of different subsequent treatment units, and has the advantages of strong adaptability and wide application range.
(4) The ultraviolet-assisted urban sewage nitrosation technology can be coupled with novel sewage biological denitrification technologies such as short-cut nitrification and denitrification, anaerobic ammonia oxidation technologies and the like, and lays a foundation for popularization and application of the novel sewage biological denitrification technologies in urban sewage.
Drawings
FIG. 1 is a schematic view of a Sequencing Batch Reactor (SBR) structure.
FIG. 2 is a schematic diagram of the Membrane Bioreactor (MBR) structure.
FIG. 3 is a graph showing the operation effect of the reactor in example 1.
FIG. 4 is a graph showing the operation effect of the reactor in comparative example 1.
FIG. 5 is a graph showing the operation effect of the reactor in example 2.
FIG. 6 is a graph showing the operation effect of the reactor in example 3.
Detailed Description
The present invention will be described in further detail below with reference to examples and drawings, but the present invention is not limited to these examples.
The following examples and comparative examples refer to a reactor Sequencing Batch Reactor (SBR) and a Membrane Bioreactor (MBR), which is one of the continuous reactors. The structure of the sequencing batch reactor is shown in fig. 1, and mainly comprises: the reactor comprises a cylindrical reactor main body, a 2-UVA waveband ultraviolet lamp (with the wavelength peak value of 365nm), a 3-water inlet system (comprising a water inlet pipeline and a water pump), a 4-water drainage system (comprising a water drainage pipeline and an electromagnetic valve), a 5-aeration system (comprising an air inlet pipeline, an air pump and an aeration head), a 6-pH automatic control system (comprising a pH electrode, a controller and an acid-base feeding pump) and a 7-PLC automatic control unit.
The structure of the Membrane Bioreactor (MBR) is shown in fig. 2, and mainly comprises: the reactor comprises a cylindrical reactor body 1, a 2-UVA band ultraviolet lamp (with the wavelength peak value of 365nm), a 3-membrane component (hollow fiber membrane), a 4-water inlet system (comprising a water inlet pipeline and a water pump), a 5-water outlet system (comprising a water outlet pipeline and a water discharge pump), a 6-aeration system (comprising a water inlet pipeline, an air pump and an aeration head), a 7-pH automatic control system (comprising a pH electrode, a controller and an acid-base feeding pump) and an 8-PLC automatic control unit. The UVA wave band ultraviolet lamp is positioned to meet the requirements that the power of the ultraviolet lamp of a unit volume reactor is 6W and the ultraviolet irradiance is 2000 mu W/cm2For the sake of accuracy, its specific position is not specified.
Example 1
The present embodiment employs a Sequencing Batch Reactor (SBR) as a device of the municipal sewage nitrosation technology. The sequencing batch reactor has 6 periods including water feeding of 20 min, aeration of 5 hr, deposition of 30 min and water draining of 10 min, and the water draining amount in each period is half of the total effective reactor volume, i.e. the volume exchange rate is 50% and the hydraulic retention time is 12 hr.
The embodiment adopts the reactor, and the specific operation and control method comprises the following steps:
(1) reactor inoculation A2And (3) introducing pretreated urban sewage to culture and acclimate inoculated sludge after 1 day of aeration, and marking the completion of acclimatization and culture of the inoculated sludge when the removal rate of ammonia nitrogen in effluent exceeds 90%. The main water quality indexes of the pretreated urban sewage are as follows: chemical Oxygen Demand (COD) is 100-150 mg/L, ammonia nitrogen concentration is 45-55 mgN/L, pH value is 7.5-8.0, alkalinity is (CaCO is used)3Calculated) is 300-400 mg/L.
(2) Opening a UVA wave band ultraviolet lamp in the sequencing batch reactor, controlling the concentration of dissolved oxygen in the reactor to be 4-5 mg/L, controlling the sludge age to be 15-20 days by regularly discharging sludge every day, controlling the temperature of the reactor to be 25-30 ℃, not controlling the pH value in the reactor in the whole process, controlling the pH value in the reactor to be 7.8-8.5 under the condition, and monitoring the concentrations of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the effluent of the reactor every day.
The operation results of the reactor are shown in fig. 3, and it can be seen from fig. 3 that the accumulation rate of nitrite nitrogen reaches more than 80% from the 11 th day of the start of the reactor, and the stable operation time is more than 1 month, which indicates the realization of stable nitrosation of municipal sewage.
Example 2
The present embodiment employs a Sequencing Batch Reactor (SBR) as a device of the municipal sewage nitrosation technology. The sequencing batch reactor has a period of 6 hours, and comprises the steps of feeding water for 20 minutes, aerating for 5 hours, precipitating for 30 minutes and draining for 10 minutes. The displacement per cycle was half the total effective volume of the reactor, i.e. a volume exchange rate of 50%, corresponding to a hydraulic retention time of 12 hours.
The embodiment adopts the reactor, and the specific operation and control method comprises the following steps:
(1) reactor inoculation A2And (3) inoculating the activated sludge in an aeration tank of the/O process sewage treatment plant, wherein the inoculation amount is 1500mgVSS/L, and after 1 day of aeration, introducing the pretreated urban sewage to culture and domesticate the inoculated sludge. And when the removal rate of the ammonia nitrogen in the effluent exceeds 90 percent, marking the completion of the acclimatization and culture of the inoculated sludge. The main water quality indexes of the pretreated urban sewage are as follows: chemical Oxygen Demand (COD) is 100-150 mg/L, ammonia nitrogen concentration is 45-55 mgN/L, pH value is 7.5-8.0, alkalinity is (CaCO is used)3Calculated) is 300-400 mg/L.
(2) Opening a UVA wave band ultraviolet lamp in the sequencing batch reactor, controlling the concentration of dissolved oxygen in the reactor to be 4-5 mg/L, controlling the sludge age to be 15-20 days by regularly discharging sludge every day, controlling the temperature of the reactor to be 25-30 ℃, controlling the pH value in the reactor to be 7.5-7.7 by using a pH automatic control system, and monitoring the concentrations of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the effluent of the reactor every day.
The results of the reactor run are shown in figure 5. After the pH value is controlled to be 7.5-7.7, the accumulation rate of nitrite in the effluent of the reactor is reduced to 50% -55%, the concentration of ammonia nitrogen and nitrite nitrogen in the effluent of the reactor is about 15mg N/L, namely the ratio of the ammonia nitrogen and nitrite nitrogen in the effluent is close to 1:1, meeting the water inlet requirement of a subsequent anaerobic ammonia oxidation unit.
Example 3
The embodiment adopts a Membrane Bioreactor (MBR) as a device of the urban sewage nitrosation technology. The membrane bioreactor adopts continuous water inlet and continuous water outlet, the hydraulic retention time is 12 hours, the membrane flux is 10L/m2H is used as the reference value. When the membrane module is completely contaminated (transmembrane pressure difference)>70kPa), soaking the mixture for 1 to 2 hours by using a chemical cleaning solution containing 0.01M NaOH and 200mg/L sodium hypochlorite, and repeatedly using the mixture after chemical cleaning.
The embodiment adopts the reactor, and the specific operation and control method comprises the following steps:
(1) reactor inoculation A2And (3) inoculating the activated sludge in an aeration tank of the/O process sewage treatment plant, wherein the inoculation amount is 1500mgVSS/L, and after 1 day of aeration, introducing the pretreated urban sewage to culture and domesticate the inoculated sludge. And when the removal rate of the ammonia nitrogen in the effluent exceeds 90 percent, marking the completion of the acclimatization and culture of the inoculated sludge. The main water quality indexes of the pretreated urban sewage are as follows: chemical Oxygen Demand (COD) is 100-150 mg/L, ammonia nitrogen concentration is 45-55 mgN/L, pH value is 7.5-8.0, alkalinity is (CaCO is used)3Calculated) is 300-400 mg/L.
(2) Opening a UVA wave band ultraviolet lamp in the membrane bioreactor, controlling the concentration of dissolved oxygen in the reactor to be 4-6 mg/L, controlling the sludge age to be 15-20 days by regularly discharging sludge every day, controlling the temperature of the reactor to be 25-30 ℃, not controlling the pH value in the reactor in the whole process, controlling the pH value in the reactor to be 7.8-8.5 under the condition, and monitoring the concentrations of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the effluent of the reactor every day.
The operation result of the reactor is shown in fig. 6, and can be obtained from the graph, the accumulation rate of nitrite nitrogen reaches more than 80% from the 21 st day of the reactor start, and the stable operation time is more than 1 month, which indicates the realization of the stable nitrosation of the municipal sewage.
Comparative example 1
The present embodiment employs a Sequencing Batch Reactor (SBR) as a device of the municipal sewage nitrosation technology. The sequencing batch reactor has a period of 6 hours, and comprises the steps of feeding water for 20 minutes, aerating for 5 hours, precipitating for 30 minutes and draining for 10 minutes. The displacement per cycle was half the total effective volume of the reactor, i.e. a volume exchange rate of 50%, corresponding to a hydraulic retention time of 12 hours.
The embodiment adopts the reactor, and the specific operation and control method comprises the following steps:
(1) reactor inoculation A2And (3) inoculating the activated sludge in an aeration tank of the/O process sewage treatment plant, wherein the inoculation amount is 1500mgVSS/L, and after 1 day of aeration, introducing the pretreated urban sewage to culture and domesticate the inoculated sludge. And when the removal rate of the ammonia nitrogen in the effluent exceeds 90 percent, marking the completion of the acclimatization and culture of the inoculated sludge. The main water quality indexes of the pretreated urban sewage are as follows: chemical Oxygen Demand (COD) is 100-150 mg/L, ammonia nitrogen concentration is 45-55 mgN/L, pH value is 7.5-8.0, alkalinity is (CaCO is used)3Calculated) is 300-400 mg/L.
(2) The concentration of dissolved oxygen in the reactor is controlled to be 4-6 mg/L, sludge age is controlled to be 15-20 days by regularly discharging sludge every day, the pH value in the reactor is not controlled in the whole process, the pH value is 7.8-8.5, and the temperature of the reactor is 25-30 ℃. During the operation of the reactor, the UVA wave band ultraviolet lamp in the reactor is not opened. The concentration of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the reactor effluent is monitored every day.
The results of the reactor run are shown in figure 4. It can be seen that the reactor did not show an accumulation of nitrite nitrogen, i.e. no nitrosation process was achieved, in contrast to example 1.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. An ultraviolet-assisted urban sewage nitrosation method is characterized by comprising the following steps:
(1) adding inoculated sludge into a reactor, and performing acclimatization culture on the inoculated sludge;
(2) irradiating the sludge domesticated and cultured in the reactor by ultraviolet rays in UVA waveband, introducing the pretreated urban sewage into the reactor, controlling the concentration of dissolved oxygen in the reactor to be 2-7 mg/L, controlling the hydraulic retention time to be 8-48 h, controlling the sludge age to be 15-40 days, controlling the temperature to be 15-35 ℃, and monitoring the concentrations of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the effluent of the reactor every day.
2. The ultraviolet-assisted-based municipal sewage nitrosation method according to claim 1, wherein said UVA band ultraviolet of step (2) has a wavelength of 320nm to 420 nm.
3. The ultraviolet-assisted-based urban sewage nitrosation method of claim 2, wherein the source of UVA band ultraviolet rays in step (2) is a mercury lamp or an ultraviolet light emitting diode, and the ultraviolet irradiance is 1000-2000 μ W/cm2And the power of an ultraviolet lamp of the reactor in unit volume is 2-6W.
4. The ultraviolet-assisted-based urban sewage nitrosation method according to any one of claims 1 to 3, wherein the water quality index of the pretreated urban sewage in step (2) is as follows: the chemical oxygen demand is 50-500 mg/L; the ammonia nitrogen concentration is 20-50 mg N/L; the pH value is 7.0-9.0; alkalinity, as CaCO3The amount is 50-500 mg/L.
5. The method for nitrosation of municipal sewage based on UV assistance according to any one of claims 1 to 3, wherein the concentration of sludge in step (2) is 1000 to 2000mg VSS/L.
6. The ultraviolet-assisted-based urban sewage nitrosation method of claim 1, wherein in step (2), the pH of the reactor system is 7.8-8.5, and the accumulation rate of nitrite in the reactor effluent is 80-100%.
7. The ultraviolet-assisted-based urban sewage nitrosation method of claim 1, wherein in step (2), the pH of the reactor system is controlled to be 7.5-7.7, and the accumulation rate of nitrite in the effluent of the reactor is 50-60%.
8. The method for nitrifying municipal sewage based on ultraviolet assistance according to any one of claims 1 to 3, wherein the reactor of step (1) is a sequencing batch reactor or a continuous reactor.
9. The ultraviolet-assistance-based urban sewage nitrosation method according to any one of claims 1 to 3, wherein said acclimatization culture of step (1) is a continuous culture method or an intermittent culture method.
10. The method for nitrifying municipal sewage based on ultraviolet assistance according to any one of claims 1 to 3, wherein the inoculated sludge in step (1) is activated sludge with biological denitrification function.
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| CN112979108A (en) * | 2021-05-14 | 2021-06-18 | 西南大学 | Anaerobic reactor effluent nitrosation method |
| CN113979539A (en) * | 2021-11-12 | 2022-01-28 | 广州大学 | Photoinduction-based mud membrane composite autotrophic nitrogen removal technology and reactor |
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