A method and device for accelerating the start-up of short-cut nitrification and anaerobic ammonium oxidation biological nitrogen removal

Abstract

The present invention discloses a method for accelerating the start-up of shortcut nitrification and anaerobic ammonium oxidation biological nitrogen removal. After pretreatment, MIL-53(Fe) and activated sludge are simultaneously added to an integrated shortcut nitrification and anaerobic ammonium oxidation reactor for treatment. The present invention utilizes the organic framework of MIL-53(Fe) to provide an excellent carrier with a large specific surface area for the growth of shortcut nitrification and anaerobic ammonium oxidation bacteria, accelerating the formation of anaerobic ammonium oxidation granular sludge; through the Fe metal center of MIL-53, promoting the secretion of EPS by anaerobic ammonium oxidation bacteria and accelerating the enrichment and proliferation of shortcut nitrification and anaerobic ammonium oxidation bacteria; adding MIL-53 can further improve the stability of the shortcut nitrification and anaerobic ammonium oxidation reaction device for treating nitrogen-containing acidic wastewater, reduce the dependence on nitrite nitrogen in the anaerobic ammonium oxidation process, and save the energy consumption of nitrogen-containing wastewater treatment.

Description

Technical Field

[0001] The present invention belongs to the field of sewage treatment, and relates to a device and method for accelerating the start-up of shortcut nitrification and anaerobic ammonium oxidation biological nitrogen removal by adding MIL-53. Background Art

[0002] The proliferation time of anaerobic ammonium-oxidizing bacteria is relatively long (about 10 - 15 days), and anaerobic ammonium-oxidizing bacteria are easily impacted by fluctuations in sewage quality and are also relatively sensitive to changes in environmental factors. This makes the start-up and operation debugging time of anaerobic ammonium-oxidizing reactors very long in practical engineering applications. The retention time of anaerobic ammonium-oxidizing granular sludge in the reactor is longer than that of general activated sludge and flocculent sludge. Thus, the enrichment of anaerobic ammonium-oxidizing bacteria can be achieved, and at the same time, sludge granulation can improve the shock resistance of anaerobic ammonium-oxidizing bacteria. How to quickly domesticate and cultivate anaerobic ammonium-oxidizing granular sludge, shorten the start-up time of anaerobic ammonium-oxidation reaction, and enhance its stability has important significance for the popularization and application of anaerobic ammonium-oxidation technology.

[0003] There have been many research reports that by providing a carrier for the growth and attachment of excellent anaerobic ammonium-oxidizing organisms, the formation process of biofilm granular sludge can be accelerated. The addition of an appropriate amount of iron also has an obvious promoting effect on anaerobic ammonium-oxidizing bacteria. Adding iron can optimize the growth environment of anaerobic ammonium-oxidizing bacteria, increase the relative abundance of Planctomycetes in the anaerobic ammonium-oxidation system and the activity of anaerobic ammonium-oxidizing bacteria. Inorganic particles rich in iron can promote the formation process of anaerobic ammonium-oxidizing granular sludge.

[0004] CN108178302 A discloses a device and method for the rapid start-up and stable maintenance of shortcut nitrification / anaerobic ammonium oxidation integration, which belongs to the field of biological treatment of urban domestic sewage. By adding hydroxylamine (HA), the effect of inhibiting the activity of nitrite-oxidizing bacteria while increasing the activity of anaerobic ammonium oxidation can be achieved, and the integrated shortcut nitrification / anaerobic ammonium oxidation reactor can be started up in a relatively short time and maintain a good treatment effect. Therefore, accelerating the start-up of shortcut digestion and anaerobic ammonium oxidation biological nitrogen removal has good application prospects. At the same time, how to improve the ability of the system to resist the impact of wastewater pH changes, and reduce the dependence on nitrite nitrogen in the anaerobic ammonium-oxidation process, and save the energy consumption of nitrogen-containing wastewater treatment are also the common pursuits in this field.

[0005] MIL-53(Fe) metal-organic framework, with a cas number of 764608-47-1, is stable in air, stable in aqueous solution and acidic conditions, and its stability and thermal decomposition temperature are greater than 300°C. Currently, it is used for the adsorption of gases (such as carbon dioxide) and pollutants, and can also be used as a Lewis acid catalyst with catalytic performance. Currently, there is no report on the use of MIL-53(Fe) for accelerating the start-up of shortcut nitrification and anaerobic ammonium oxidation biological nitrogen removal. Summary of the Invention

[0006] Objective of the Invention: Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a device and method for accelerating the start-up of short-cut nitrification and anammox biological nitrogen removal, so as to realize the rapid start-up of an integrated short-cut nitrification and anammox reaction equipment and its application in real sewage treatment.

[0007] To solve the above technical problems, the present invention discloses a method for accelerating the start-up of short-cut nitrification and anammox biological nitrogen removal. By adding pretreated MIL-53(Fe) and activated sludge into an integrated short-cut nitrification and anammox reactor simultaneously, and adopting an intermittent aeration mode for periodic operation, with influent water, anoxic stirring, aerobic aeration, sedimentation and drainage as one cycle. By monitoring the DO and pH in the reactor and setting the aerobic / anoxic alternation time according to the characteristic points on the DO and pH value change curves, the accumulation of NO2-N can be improved. Among them, the pretreated MIL-53(Fe) is prepared by the following method: MIL-53(Fe) is alternately washed with methanol and DMF for several times, activated in a vacuum oven at 60-150 °C for 5-10 hours, and the activated and dried MIL-53(Fe) is screened with a sieve to obtain the pretreated MIL-53(Fe).

[0008] Preferably, the activated and dried MIL-53(Fe) is screened with a 400-mesh sieve, and the MIL-53(Fe) powder with a particle size within 0.04 mm is obtained after screening.

[0009] Among them, the dosing concentration of the activated sludge is 2500-3500 mg / L, and the dosing concentration of MIL-53(Fe) is 100-500 mg / L.

[0010] Preferably, in the influent water stage, the influent water volume is controlled to be 50%-70% of the total effective volume of the reactor, the drainage ratio of each cycle is 65%-75%, and the HRT is 22-32 h.

[0011] Among them, in the anoxic stirring stage, the dissolved oxygen concentration is controlled below 0.1 mg / L, and the anoxic stirring is stopped when the effluent nitrite nitrogen concentration is lower than 10 mg / L; in the aerobic aeration stage, the dissolved oxygen concentration is controlled at 0.2-0.6 mg / L, and the aerobic aeration is stopped when the effluent ammonia nitrogen concentration is lower than 10 mg / L.

[0012] In the sedimentation and drainage stage, the sedimentation time is 10-30 min, the sludge discharge amount is 10%-20% of the total sludge amount, and the supernatant after sedimentation is discharged through the drainage valve.

[0013] The present invention further provides a short-cut nitrification and anaerobic ammonium oxidation biological nitrogen removal device, which includes a raw water inlet tank, an integrated short-cut nitrification and anaerobic ammonium oxidation reactor, and a sewage outlet tank connected in sequence; the integrated anaerobic ammonium oxidation reactor includes a reactor body, a sludge dosing unit, an accelerator dosing unit, an on-line water quality monitoring component, and an aeration device; the sludge dosing unit is provided with granular sludge and activated sludge; the accelerator dosing unit is provided with pretreated MIL-53(Fe), and the pretreated MIL-53(Fe) is prepared by the following method: MIL-53(Fe) is alternately washed with methanol and DMF for several times, activated in a vacuum oven at 60-150 °C for 5-10 hours, and the activated and dried MIL-53(Fe) is sieved through a 400-mesh sieve to obtain MIL-53 powder with a particle size within 0.04 mm.

[0014] Among them, the reactor body is provided with an inlet valve, an air inlet valve, a double-paddle stirrer, and several drain valves; the on-line water quality monitoring component includes a pH on-line monitor and a DO on-line monitor; the aeration device includes an electronic flowmeter, a flow stabilizer, and a variable-frequency air pump connected in sequence with the air inlet valve.

[0015] The pH on-line monitor, the DO on-line monitor, and the variable-frequency air pump are all communicatively connected to the PLC controller.

[0016] The raw water inlet tank is connected to the integrated short-cut nitrification and anaerobic ammonium oxidation reactor through a feed water pump; the sewage outlet tank is connected to the integrated short-cut nitrification and anaerobic ammonium oxidation reactor through a discharge water pump.

[0017] After the reaction is completed, MIL-53 is recovered by applying a magnetic field, washed with methanol, and recycled after drying at 120 °C.

[0018] Beneficial effects: Compared with the prior art, the present application has the following advantages:

[0019] (1) The high specific surface area and adsorption capacity of the MIL-53 organic framework can provide more adsorption sites for anaerobic ammonium oxidation microorganisms, provide an excellent carrier for the growth and reproduction of anaerobic ammonium oxidation bacteria, and shorten the start-up time of the anaerobic ammonium oxidation reaction;

[0020] (2) The Fe metal center of MIL-53 helps to promote the secretion of EPS by anaerobic ammonium oxidation bacteria and promote the aggregation and proliferation of short-cut nitrification and anaerobic ammonium oxidation bacteria;

[0021] (3) The broadening effect of MIL-53 on pH can significantly improve the ability of the system to resist the impact of changes in the pH value of wastewater, thereby improving the stability of the short-cut nitrification and anaerobic ammonium oxidation reaction device in treating actual acidic nitrogen-containing wastewater;

[0022] (4) MIL-53 has a Lewis acid catalytic function and can act as an electron acceptor, reducing the dependence on nitrite nitrogen in the anaerobic ammonium oxidation process and saving the energy consumption for nitrogen-containing wastewater treatment. Description of the Drawings

[0023] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments, and the above and / or other advantages of the present invention will become clearer.

[0024] Figure 1 It is: a device and method for accelerating the start-up of shortcut nitrification and anaerobic ammonium oxidation biological nitrogen removal by adding MIL-53; wherein, 1 raw water inlet tank, 2 integrated shortcut nitrification and anaerobic ammonium oxidation reactor, 3 outlet tank; 1-1 inlet water pump, 2-1 granular sludge, 2-2 activated sludge, 2-3 on-line water quality monitoring component, 2-4 aeration device, 2-5 inlet valve, 2-6 drain valve I, 2-7 drain valve II, 2-8 drain valve III, 2-9 drain valve IV, 2-10 drain valve V, 2-11 intake valve, 2-12 double-paddle stirrer, 2-13 PH on-line monitor, 2-14 DO on-line monitor, 2-15 variable-frequency air pump, 2-16 flow stabilizer, 2-17 electronic flowmeter, 3-1 outlet water pump;

[0025] Figure 2 It is a line graph of the denitrification effect and the influent concentration.

[0026] Figure 3 It is a line graph of the denitrification situation of the reactor.

[0027] Figure 4 It is the influence of the concentration of MIL-53 on the denitrification effect.

[0028] Figure 5 It is the influence of the recycling times of MIL-53 on the denitrification effect.

[0029] Figure 6 It is the change of the influent concentration with the number of operating days.

[0030] Figure 7 It is the denitrification situation diagram of two reactors. Specific Embodiments

[0031] In the following examples, the experimental methods are all conventional methods unless otherwise specified; the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0032] Such as Figure 1As shown in the figure, a device for accelerating the start-up of shortcut nitrification and anammox biological nitrogen removal by adding MIL-53 is provided with a raw water inlet tank 1, an integrated shortcut nitrification and anammox reactor 2, and a sewage outlet tank 3; the integrated shortcut nitrification and anammox reactor 2 is provided with granular sludge 2-1, activated sludge 2-2, an on-line water quality monitoring component 2-3, an aeration device 2-4, an inlet valve 2-5, a drain valve I 2-6, a drain valve II 2-7, a drain valve III 2-8, a drain valve IV 2-9, a drain valve V 2-10, an intake valve 2-11, and a double-paddle stirrer 2-12; the on-line water quality monitoring component 2-3 includes a PH on-line monitor 2-13 and a DO on-line monitor 2-14 connected to a PLC controller; the aeration device 2-4 includes a variable-frequency air pump 2-15, a flow stabilizer 2-16, and an electronic flowmeter 2-17 connected to the intake valve; the air pump is communicatively connected to the PLC controller; the raw water inlet tank 1 is connected to the integrated shortcut nitrification and anammox reactor 2 through a feed pump 1-1; the sewage outlet tank 3 is connected to the integrated shortcut nitrification and anammox reactor 2 through a discharge pump 3-1.

[0033] A method for accelerating the start-up of shortcut nitrification and anammox biological nitrogen removal by adding MIL-53 using the above device is as follows for specific operation:

[0034] 1) Material pretreatment: MIL-53 is alternately washed three times with methanol and DMF, activated in a vacuum oven at 60-150 °C for 5-10 hours, and the activated and dried MIL-53 is screened through a 400-mesh sieve to obtain MIL-53 powder with a particle size within 0.04 mm.

[0035] 2) Start-up of the system: The pretreated MIL-53 and sludge with shortcut nitrification activity are added to the integrated shortcut nitrification and anammox reactor 2 to make the activated sludge concentration in the integrated shortcut nitrification and anammox reactor 2 be 2500-3500 mg / L, and the mass concentration of MIL-53 added in the integrated shortcut nitrification and anammox reaction equipment 2 is 100-500 mg / L; intermittent aeration mode is adopted for periodic operation, the operation period is set to 8 h, 2 cycles are run every day, and the treated water volume is 32 L / d. Taking the process of influent, reaction, sedimentation, and effluent as one cycle. Using artificially prepared sewage containing ammonia nitrogen and nitrite nitrogen as the treatment object, the NH4 + -N concentration of the influent is 50 mg / L, and NO2 -The concentration of -N is 60 mg / L, and the concentration of COD is 150 mg / L. The DO and pH in the reactor are monitored online in real time through the water quality online monitoring component 2-3. According to the characteristic points on the DO and pH change curves, the aerobic / anoxic alternating time is arranged. In the aeration stage, the DO rises rapidly and shows an inflection point, indicating that the reaction starts to enter the nitrification stage. During the nitrification stage, the DO maintains a relatively stable platform, and then the rapid decrease of DO indicates the end of the nitrification reaction and the start of the anaerobic ammonium oxidation reaction, and the system enters an anaerobic state. The pH continuously rises during the carbon oxidation stage of the aeration stage. When the carbon oxidation stage ends, the pH curve shows a turning point, and the pH starts to continuously decrease. The reaction enters the nitrification stage, resulting in a decrease in pH. Then the pH starts to rise again, indicating that the system starts to enter the anaerobic ammonium oxidation stage, reaching a relatively high NO2 - -N accumulation;

[0036] 3) The adjustment operations during operation are as follows:

[0037] 3.1) The sewage in the raw water inlet tank 1 is pumped into the integrated shortcut nitrification anaerobic ammonium oxidation reactor 2 by the inlet water pump 1-1. The inlet water volume is 50% of the total effective volume of the integrated shortcut nitrification anaerobic ammonium oxidation reaction equipment 2. The inlet water time is set to 15 min, the drainage ratio of each cycle is 75%, and the HRT is 22-32 h. After the inlet water is completed, samples are taken in the reactor to measure the initial concentrations of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen, and COD in the mixed liquor;

[0038] 3.2) After the inlet water stage ends, it enters an anoxic stirring stage of 30 min - 60 min. The stirring speed is 300 rpm. During the anoxic stirring stage, the dissolved oxygen concentration is controlled below 0.1 mg / L through the water quality online monitoring component 2-3. When the nitrite nitrogen concentration in the effluent is lower than 10 mg / L, the anoxic stirring stops;

[0039] 3.3) After the anoxic stirring stage ends, it enters the aerobic aeration stage. During the aerobic aeration stage, the dissolved oxygen concentration is controlled at 0.2 - 0.6 mg / L through the water quality online monitoring component (2.3). When the ammonia nitrogen concentration in the effluent is lower than 10 mg / L, the aerobic aeration stops;

[0040] 3.4) In the precipitation and drainage stage, the precipitation time of the integrated shortcut nitrification anaerobic ammonium oxidation reactor 2 is 15 min. The sludge retention time SRT is controlled at 12 d, and the sludge discharge amount is 10% of the total sludge amount. The supernatant after precipitation is discharged through the drainage valve.

[0041] 4) Material recycling: After the reaction ends, a magnetic field is applied to recover MIL-53, which is washed with methanol and dried at 120 °C for recycling.

[0042] The present invention will be described in detail below through specific embodiments.

[0043] Example 1: Influence of the activation temperature of MIL-53 on the operation effect.

[0044] MIL-53 was alternately washed three times with methanol and DMF, and activated in an oven at 60 °C, 90 °C, 120 °C, and 150 °C (under vacuum) for 5 hours respectively. After the activation and drying were completed, MIL-53 was sieved through a 400-mesh sieve. The pretreated MIL-53 and the sludge with short-cut nitrification activity were added to the integrated short-cut nitrification and anaerobic ammonium oxidation reactor 2, so that the activated sludge concentration in the integrated short-cut nitrification and anaerobic ammonium oxidation reaction equipment 2 was 2500 mg / L, and the mass concentration of MIL-53 added in the integrated short-cut nitrification and anaerobic ammonium oxidation reaction equipment 2 was 500 mg / L. Then, the operation device was started at a temperature of 30 - 50 °C according to the above steps.

[0045] It can be seen that Figure 2 when the activation temperature was 60 °C, the TN removal rate of the device was only 42%, and MIL-53 was not activated and could not play the role of accelerating and improving nitrogen removal. After activation at 90 °C, the TN removal rate during operation increased to 65%. When the activation temperature was raised to 120 °C, the TN removal rate of the device was significantly improved to 82%. When the activation temperature was further raised to 150 °C, the TN removal rate of the device decreased slightly to 76%. It was proved that 120 °C was the optimal activation temperature of MIL-53.

[0046] Example 2: Influence of the activation time of MIL-53 on the operation effect.

[0047] MIL-53 was alternately washed three times with methanol and DMF, and activated in an oven at 120 °C (under vacuum) for 5, 6, 7, 8, 9, and 10 h respectively. After the activation and drying were completed, MIL-53 was sieved through a 400-mesh sieve. The pretreated MIL-53 and the sludge with short-cut nitrification activity were added to the integrated short-cut nitrification and anaerobic ammonium oxidation reaction equipment (2), so that the activated sludge concentration in the integrated short-cut nitrification and anaerobic ammonium oxidation reaction equipment 2 was 2500 mg / L, and the mass concentration of MIL-53 added in the integrated short-cut nitrification and anaerobic ammonium oxidation reaction equipment 2 was 500 mg / L. Then, the operation device was started according to the above steps.

[0048] It can be seen that Figure 3 when the activation time gradually increased from 5 h to 10 h, the TN removal rate of the reactor decreased continuously and slowly from 85% to 66%. MIL-53 had the best performance after being activated for 5 h, and further increasing the activation time was adverse to nitrogen removal.

[0049] Example 3: Influence of the dosage of MIL-53 on the operation effect.

[0050] MIL-53 was washed three times alternately with methanol and DMF, activated in a (vacuum) oven at 120 °C for 5 hours, and the activated and dried MIL-53 was sieved through a 400-mesh sieve. The pretreated MIL-53 and the sludge with short-range nitrification activity were added to the integrated short-range nitrification and anaerobic ammonium oxidation reaction equipment 2, so that the activated sludge concentration in the integrated short-range nitrification and anaerobic ammonium oxidation reaction equipment 2 was 2500 mg / L, and the mass concentrations of MIL-53 added in the integrated short-range nitrification and anaerobic ammonium oxidation reaction equipment 2 were 100, 200, 300, 400, and 500 mg / L respectively. Then the operating device was started according to the above steps.

[0051] It can be seen that Figure 4 as the dosing concentration of MIL-53 increased continuously, the TN removal rate of the device also increased continuously, rising from 58% to 85%. The addition of MIL-53 provided more carriers for the growth and reproduction of anaerobic ammonium-oxidizing bacteria, shortening the start-up time of the device; at the same time, it promoted the secretion of EPS and the aggregation and proliferation of short-range nitrification and anaerobic ammonium-oxidizing bacteria, thus improving the nitrogen removal effect.

[0052] Example 4 Influence of the recycling of MIL-53 on the operation effect.

[0053] MIL-53 was washed three times alternately with methanol and DMF, activated in a (vacuum) oven at 120 °C for 5 hours, and the activated and dried MIL-53 was sieved through a 400-mesh sieve. The pretreated MIL-53 and the sludge with short-range nitrification activity were added to the integrated short-range nitrification and anaerobic ammonium oxidation reaction equipment 2, so that the activated sludge concentration in the integrated short-range nitrification and anaerobic ammonium oxidation reaction equipment 2 was 2500 mg / L, and the mass concentration of MIL-53 added in the integrated short-range nitrification and anaerobic ammonium oxidation reaction equipment 2 was 500 mg / L. Then the operating device was started according to the above steps. After the reaction, MIL-53 was recovered by applying a magnetic field, washed with methanol, dried at 120 °C, and recycled.

[0054] It can be seen that Figure 5 as the number of recycling times of MIL-53 increased from 1 time to 10 times, the overall nitrogen removal efficiency of the reactor remained above 80% in the first 6 times or so. Starting from the 7th time, after the operation was stable, the nitrogen removal efficiency decreased slightly to 78%. After being repeatedly used 10 times, the nitrogen removal efficiency still remained at about 75%.

[0055] Example 5 Application of MIL-53 in accelerating the start-up of short-range nitrification and anaerobic ammonium oxidation biological nitrogen removal in actual wastewater.

[0056] The main body of the device used is made of plexiglass and can be sealed as a whole. The effective height of the reactor is 80 cm, the inner diameter is 20 cm, and the effective volume is 22 L. Blowing aeration is carried out by matching an air pump and a microporous aeration head, and the rotor flowmeter is used to control the aeration volume to 0.2 L / min, with DO being 0.1 - 1.0 mg / L. MIL-53 is added to one of the integrated reactors (denoted as R1); nothing is added to the other integrated reactor (denoted as R2) for comparison. The influent substrate includes 0.450 g / L (NH4)2SO4, 0.225 g / L NaNO2, and 1.1 g / L NaHCO3, and the influent ammonia nitrogen concentration is controlled to be 150 mg / L, and the COD concentration is 300 mg / L.

[0057] With the improvement of the denitrification effect, the influent concentration gradually increases as Figure 6 , and the denitrification conditions of the two reactors are as Figure 7 . The 0 - 7 days is the adaptation stage. There is no obvious difference between R1 and R2 in this stage, and the total nitrogen removal rate remains at a relatively low level. Starting from the 8th day, the denitrification efficiency of the two shows obvious differences. R1 is significantly better than R2. On the 16th day, the total nitrogen removal in R1 reaches about 82%, which is more than 34% higher than that in R2. In the subsequent operation, with the continuous increase of the influent total nitrogen concentration, the total nitrogen removal rate in R1 is always higher than that in R2.

[0058] The present invention provides an idea and method for accelerating the start-up of shortcut nitrification and anaerobic ammonium oxidation biological denitrification. There are many methods and ways to specifically implement this technical solution. The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be realized by the existing technology.

Claims

1. A method for accelerating the start-up of shortcut nitrification-anaerobic ammonium oxidation biological nitrogen removal, characterized in that, When treating wastewater, the pretreated MIL-53(Fe) and activated sludge are simultaneously added to an integrated shortcut nitrification and anaerobic ammonium oxidation reactor, and intermittent aeration mode is adopted for periodic operation. Taking influent, anoxic stirring, aerobic aeration, sedimentation and drainage as a cycle, the aerobic / anoxic alternating time is set according to the monitored DO and pH in the reactor, so as to increase the accumulation of NO 2- N. Among them, the pretreated MIL-53(Fe) is prepared by the following method: MIL-53(Fe) is alternately washed with methanol and DMF for several times, activated in a vacuum oven at 60-150 °C for 5-10 hours, and the activated and dried MIL-53(Fe) is screened with a sieve to obtain the pretreated MIL-53(Fe).

2. The method according to claim 1, wherein The MIL-53(Fe) after activation drying was screened through a 400-mesh sieve, and the MIL-53(Fe) powder with a particle size within 0.04 mm was obtained after screening.

3. The method according to claim 1, wherein The total nitrogen concentration in the wastewater was controlled at 800 - 1000 mg / L, the dosing concentration of activated sludge was 2500 - 3500 mg / L, and the dosing concentration of MIL-53(Fe) was 100 - 500 mg / L.

4. The method according to claim 1, characterized in that, In the influent stage, the influent volume was controlled at 50% - 70% of the total effective volume of the reactor, the drainage ratio for each cycle was 65% - 75%, and the HRT was 22 - 32 h.

5. The method according to claim 1, wherein In the anoxic stirring stage, the dissolved oxygen concentration was controlled below 0.1 mg / L, and the anoxic stirring was stopped when the effluent nitrite nitrogen concentration was below 10 mg / L; in the aerobic aeration stage, the dissolved oxygen concentration was controlled at 0.2 - 0.6 mg / L, and the aerobic aeration was stopped when the effluent ammonia nitrogen concentration was below 10 mg / L.

6. The method according to claim 1, wherein In the sedimentation and drainage stage, the sedimentation time was 10 - 30 min, the sludge discharge amount was 10% - 20% of the total sludge amount, and the supernatant after sedimentation was discharged through the drainage valve.

7. A short-cut nitrification and anaerobic ammonium oxidation biological nitrogen removal device, characterized in that, It includes a raw water inlet tank (1), an integrated shortcut nitrification anaerobic ammonium oxidation reactor (2), and a sewage outlet tank (3) connected in sequence; the integrated shortcut anaerobic ammonium oxidation reactor (2) includes a reactor body, a sludge dosing unit, an accelerator dosing unit, a water quality on-line monitoring component (2 - 3), and an aeration device (2 - 4); the sludge dosing unit is provided with granular sludge (2 - 1) and activated sludge (2 - 2); the accelerator dosing unit is provided with pretreated MIL-53(Fe), and the pretreated MIL-53(Fe) is prepared by the following method: MIL-53(Fe) is alternately washed with methanol and DMF for several times, activated in a vacuum oven at 60 - 150 °C for 5 - 10 hours, and the MIL-53(Fe) after activation drying is screened through a 400-mesh sieve, and the MIL-53 powder with a particle size within 0.04 mm is obtained after screening.

8. The device according to claim 7, characterized in that, The reactor body is provided with an inlet valve (2.5), an inlet gas valve (2 - 11), a double-paddle stirrer (2 - 12), and several drainage valves; the water quality on-line monitoring component (2 - 3) includes a pH on-line monitor (2 - 13) and a DO on-line monitor (2 - 14); the aeration device (2 - 4) includes an electronic flowmeter (2 - 17), a flow stabilizer (2 - 16), and a variable-frequency air pump (2 - 15) connected in sequence with the inlet gas valve (2 - 11).

Images