CN115504574B - Method for realizing stable nitrosation-anaerobic ammonia oxidation denitrification under medium DO concentration condition - Google Patents
Method for realizing stable nitrosation-anaerobic ammonia oxidation denitrification under medium DO concentration condition Download PDFInfo
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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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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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
- C02F3/006—Regulation methods for biological 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
Abstract
The invention provides a method for realizing stable nitrosation-anaerobic ammonia oxidation denitrification under the condition of medium DO concentration, which relates to the technical field of sewage treatment and comprises the following steps: an SBR reactor; the SBR reactor is provided with a water inlet pipe, a water outlet pipe and an aeration pipe, the other end of the water inlet pipe is connected with a water inlet pump, the other end of the water outlet pipe is connected with a water outlet pump, and the other end of the aeration pipe is connected with an aerator; the inside of the side wall of the SBR reactor is provided with an inclined downward stirring device, a motor of the stirring device is arranged outside the SBR reactor, and a stirring paddle is arranged in the inner cavity of the SBR reactor; and the inner cavity of the SBR reactor is filled with filler. The invention can realize the stable nitrosation-anaerobic ammonia oxidation denitrification method under the condition of medium DO concentration, greatly reduce the DO concentration diffused to the NOB layer (the inner side), and even under the condition of medium DO concentration, the NOB is in an inhibition state due to lower DO concentration, thereby solving the related problems existing when a low DO concentration strategy is adopted.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for realizing stable nitrosation-anaerobic ammonia oxidation denitrification under the condition of medium DO concentration.
Background
Compared with the traditional nitrification-denitrification process, the anaerobic ammonia oxidation process (Anamox) has the characteristics of less aeration, no consumption of organic matters, low sludge yield and the like. However, most Anammox processes today are mainly used for high concentration ammonia nitrogen (NH 4 + -N) treatment of waste water, such as sludge water, landfill leachate, etc., but at low concentration NH 4 + The treatment of N wastewater is less applicable, the main reason for this result being the low concentration of NH 4 + The nitrosation process is unstable under N conditions, i.e. the Nitrite Oxidizing Bacteria (NOB) cannot be eliminated or effectively inhibited, so that nitrite nitrogen (NO 2 - -N) is furtherOxidation to nitrate Nitrogen (NO) 3 - -N), resulting in an anaerobic ammoxidation reaction that is difficult to carry out.
To address this problem, researchers have developed different NOB inhibition methods including low Dissolved Oxygen (DO) restrictions, batch FA or FNA inhibition, short sludge age (SRT) operations, and the like. It is noted that although the above methods can achieve NOB inhibition, these methods have some problems in practical applications. When a low DO concentration strategy is adopted, NOB-Nitrobacteria with weak oxygen affinity can be inhibited, NOB-Nitrospira with strong oxygen affinity has poor inhibition effect, and AOB activity can be greatly reduced; when using batch FA or FNA inhibition, the activated sludge is periodically put into a solution containing high concentration FA or FNA to inactivate NOB, but this complicates the operation and handling of the system; when short SRT operation is adopted, NOB can be effectively eliminated, but the operation also can make Anamox bacteria difficult to exist in a large amount in the system, and the stability of the denitrification system is difficult to be ensured; by maintaining a certain concentration of NH 4 + In the case of-N, although the operation and management of the process can be effectively simplified, the NH of the effluent 4 + The N concentration is relatively high, making it difficult to meet emission requirements. Therefore, it is necessary to study a novel NOB inhibition method, thereby enabling Anamox technology to be used for low concentration NH 4 + N wastewater treatment (main stream denitrification) is possible.
Disclosure of Invention
In view of this, the present invention provides a method for achieving stable nitrosation-anammox denitrification at moderate DO levels to address the problems associated with low DO levels.
The invention provides a method for realizing stable nitrosation-anaerobic ammonia oxidation denitrification under the condition of medium DO concentration, which specifically comprises the following steps: an SBR reactor; the SBR reactor is provided with a water inlet pipe, a water outlet pipe and an aeration pipe, the other end of the water inlet pipe is connected with a water inlet pump, the other end of the water outlet pipe is connected with a water outlet pump, and the other end of the aeration pipe is connected with an aerator; the inside of the side wall of the SBR reactor is provided with an inclined downward stirring device, a motor of the stirring device is arranged outside the SBR reactor, and a stirring paddle is arranged in the inner cavity of the SBR reactor; and the inner cavity of the SBR reactor is filled with filler.
Optionally, the filler is taken from an aerobic tank of an urban sewage treatment plant, the model of the filler is K3 or K5, and the specific surface area of the filler is 500-800 m 2 /m 3 The filling rate is controlled to be 15% -35%, a certain amount of AOB, NOB and Anamox bacteria are simultaneously contained on the filling rate, the filling rate is sequentially 0.02%, 0.40% and 0.61%, and the filling material is inoculated sludge of the nitrosation-anaerobic ammoxidation process.
Optionally, the packing rate of the packing in the SBR reactor is controlled to 30%.
Optionally, the SBR reactor sequentially performs three stages of water inlet, reaction and water outlet under normal temperature, wherein a period is formed in each three stages, DO concentration is controlled to be 0.5-1.0 mg/L and HRT is controlled to be 10-20 h in the starting stage of the SBR reactor; in the steady operation stage of the SBR reactor, DO concentration is controlled to be 1.0-1.25 mg/L, and HRT is controlled to be 5-10 h.
Optionally, the inoculated filler is pre-cultured, i.e. under normal temperature conditions of 25+ -0.5 ℃, with NH 4 + N50mg/L is a water inlet matrix, the load is increased by 20 h-5 h through shortening the hydraulic retention time HRT, and the DO concentration is gradually increased from 0.5mg/L to 1.0mg/L, so that the AOB, NOB and Anamox bacteria form spatial distribution from outside to inside on the biological film, and the nitrosation-anaerobic ammonia oxidation denitrification system is successfully started.
Advantageous effects
1. The invention can realize stable nitrosation-anaerobic ammoxidation denitrification under the condition of medium DO concentration, namely, based on the difference of oxygen affinities of AOB-Nitrosomonas and NOB-Nitrospira, through the spatial distribution of AOB outside and NOB inside formed spontaneously on a biological film, DO diffused into the biological film from solution can be preferentially utilized by the AOB, so that the DO concentration diffused into the NOB layer (the inner side) is greatly reduced, NOB can be in an inhibition state due to lower DO concentration even under the condition of medium DO concentration, and the related problems existing when a low DO concentration strategy is adopted are solved.
2. The NOB inhibition effect is good, the AOB activity is enhanced, the NOB is spontaneously layered on a biological film based on the difference of oxygen affinities of AOB-Nitrosomonas and NOB-Nitrospira, the spatial distribution effectively inhibits NOB under the condition of medium DO concentration, meanwhile, the AOB activity is greatly enhanced, and the nitrosation-anaerobic ammonia oxidation can be smoothly carried out.
3. The denitrification functional microorganism is not easy to run off: the filler is used as a carrier to provide longer sludge age SRT for slow-proliferation denitrification functional microorganisms (AOB and Anamox bacteria), so that the SRT can be reserved as much as possible, and the stability of a denitrification system is enhanced.
4. The method has simple operation, takes the existing sludge (biological film) of the urban sewage treatment plant as an inoculation source, and only maintains certain DO and NH 4 + Effective NOB inhibition can be realized under the condition of N concentration, and compared with other inhibition strategies, the method can greatly simplify process operation and management.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
The drawings described below are only for illustration of some embodiments of the invention and are not intended to limit the invention.
In the drawings:
FIG. 1 is a conceptual diagram of the spatial distribution of AOB, NOB and Anamox bacteria on a biofilm in the process of the present invention.
FIG. 2 is a schematic diagram showing an axial structure of a test device according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of a test device according to an embodiment of the present invention.
Fig. 4 is a diagram showing the NOB inhibiting effect of the embodiment of the invention.
List of reference numerals
1. An SBR reactor; 2. a water inlet pipe; 3. a water outlet pipe; 4. a filler; 5. an aeration pipe; 6. a water inlet pump; 7. a water outlet pump; 8. a stirring device; 9. an aerator.
Detailed Description
In order to make the objects, aspects and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiment of the present invention. Unless otherwise indicated, terms used herein have the meaning common in the art. Like reference numerals in the drawings denote like parts.
Example 1: please refer to fig. 1 to 4:
the invention provides a method for realizing stable nitrosation-anaerobic ammonia oxidation denitrification under the condition of medium DO concentration, which comprises an SBR reactor 1; the SBR reactor 1 is provided with a water inlet pipe 2, a water outlet pipe 3 and an aeration pipe 5, the other end of the water inlet pipe 2 is connected with a water inlet pump 6, the other end of the water outlet pipe 3 is connected with a water outlet pump 7, and the other end of the aeration pipe 5 is connected with an aerator 9; the inner side of the side wall of the SBR reactor 1 is provided with an obliquely downward stirring device 8, a motor of the stirring device 8 is arranged outside the SBR reactor 1, and stirring paddles are arranged in the inner cavity of the SBR reactor 1; the inner cavity of the SBR reactor 1 is filled with a filler 4.
Wherein the filler 4 is taken from an aerobic tank of an urban sewage treatment plant, the model of the filler 4 is K3 or K5, and the specific surface area of the filler is 500-800 m 2 /m 3 The filling rate is controlled to be 15% -35%, a certain amount of AOB, NOB and Anamox bacteria are simultaneously contained on the filling rate, the filling rate is sequentially 0.02%, 0.40% and 0.61%, the filling material 4 is inoculated sludge of the nitrosation-anaerobic ammoxidation process, the mixing effect is poor when the filling material 4 is too much, and the treatment efficiency is low when the filling material 4 is too little.
Wherein the filling rate of the filler 4 in the SBR reactor 1 is controlled to be 30 percent.
The SBR reactor 1 sequentially performs three stages of water inlet, reaction and water outlet at normal temperature, wherein each three stages form a period, DO concentration is controlled to be 0.5-1.0 mg/L and HRT is controlled to be 10-20 h in the starting stage of the SBR reactor 1; in the steady operation stage of the SBR reactor 1, DO concentration is controlled to be 1.0-1.25 mg/L, and HRT is controlled to be 5-10 h.
Wherein the inoculated filler 4 is pre-cultured, namely, NH is used at the normal temperature of 25+/-0.5 DEG C 4 + N50mg/L as the feed water substrate, the load was increased by shortening the hydraulic retention time HRT by 20h to 5h, and the DO concentration was increased stepwise from 0.5mg/L to 1.0mg/L to allow the AOB, NOB and Anamox to be in productionThe object film is formed with spatial distribution from outside to inside, so that the nitrosation-anaerobic ammonia oxidation denitrification system is successfully started;
the low DO concentration strategy is based on the AOB-Nitrosomonas oxygen half-saturation constant (K O =0.36±0.40) is smaller than the NOB-nitrobacterium (K O =0.69±0.19), which makes AOB-Nitrosomonas competitive by maintaining a low DO concentration (0.30 to 0.50 mg/L); however, it is notable that AOB and NOB found in the mainstream system in recent years are AOB-Nitrosomonas and NOB-Nitrospira, respectively, and have the oxygen half-saturation constant (K O The method for stably nitrifying-anaerobic ammonia oxidation denitrification under the medium DO concentration condition is provided for two microorganisms of AOB-Nitrosomonas and NOB-Nitrospira, because the oxygen affinity of the AOB-Nitrosomonas is weaker than that of NOB-Nitrospira, AOB and NOB tend to be distributed on the biological membrane in a layered manner, namely AOB is distributed on the outer side of the biological membrane, NOB is slightly more in the spatial distribution, DO diffused into the biological membrane from the solution is preferentially utilized by the AOB under the spatial distribution, so that the DO concentration diffused into the NOB layer is greatly reduced, the activity of the NOB is greatly enhanced while the NOB is effectively inhibited, the denitrification capacity of a nitrifying-anaerobic ammonia oxidation treatment system is greatly improved, and for anamx bacteria, the aoB is strictly anoxic biological membrane is distributed on the outer side of the biological membrane, the DO is difficult to be used by the aomo, and the anamx is difficult to produce good conditions for the anamx to be enriched on the anaerobic bacteria and the inner side of the biological membrane are created.
The SBR reactor 1 is provided with a water inlet pipe 2, wastewater to be treated is injected into the SBR reactor 1 through a water inlet pump 6, the filler 4 and the wastewater are fully mixed through a stirring device 8, and after the reaction is finished, the treated wastewater is pumped out of the water outlet pipe 3 through a water outlet pump 7; after the water pumping is finished, the next reaction period is started.
Example 2:
this example uses a laboratory self-made NH-containing device 4 + -an aqueous effluent of the type (N),the concentration is 50mg/L;
this example uses the apparatus of example 1 and the denitrification method designed according to the invention for NH-containing 4 + Denitrification of N wastewater, wherein SBR reactor 1 has an effective volume of 5L and the AOB, anamox and NOB activities on packing 4 used are 2987.29mgNH 4 + -N/(m 2 ·d)、742.68mgNH 4 + -N/(m 2 D) and 1400.00mgNO 2 - -N/(m 2 D), controlling the filling rate to be 30%, controlling the HRT to be 5h, measuring the effluent quality of the device every two days, and calculating the TN removal rate.
The nitrogen component concentration of the inlet water and the outlet water during the operation of the denitrification device in the embodiment is shown in the table 1, the final TN removal rate reaches 61.68 +/-2.77%, and the NH of the outlet water 4 + The concentrations of-N and TN were 5.34.+ -. 2.25mg/L and 19.16.+ -. 1.57mg/L, respectively, thus demonstrating the low NH possible by the present experimental setup and method 4 + Stable nitrosation-anaerobic ammoxidation denitrification is achieved at N concentration.
Table 1 example 2SBR reactor water quality parameters
| Project name | NH 4 + -N(mg/L) | NO 2 - -N(mg/L) | NO 3 - -N(mg/L) | Total nitrogen sum (mg/L) |
| Concentration of water inlet | 50 | 0 | 0 | 0 |
| Concentration of effluent | 5.34±2.25 | 1.33±0.89 | 12.36±1.76 | 19.16±1.57 |
| Removal rate (%) | 89.96±4.32 | / | / | 61.68±2.77 |
Example 3:
this example shows the inhibitory effect of NOB in example 2;
to clarify the inhibition contribution of the AOB to NOB by preferential DO, it was validated by batch tests (Table 2). As is clear from the table, in test No. 1, only NO was added 2 - N, active microorganisms are NOB only, while Anamox and AOB lack NH 4 + N is in a stagnant state, so that the NOB activity measured at this time can be used as a background value, although NH is added at the same time in test 2# 4 + -N and NO 2 - The addition of N, but thiourea (ATU) brings the AOB into an inhibited state, thus, if the working activity of NOB in test 2# is reduced compared to test 1#, it is indicated that Anamox and NOB are present on the biofilm to NO 2 - Competition for N, in trial 3# NOB, anamox and AOB are all active, i.e. if NOB working activity is reduced it is likely that they will contribute jointly to the competition of AOB and Anamox with NOB.
TABLE 2 batch test of NOB inhibition mechanism
As can be seen from FIG. 4, the NOB inhibition effect in the batch test was very small, and the NOB activity in test 2# was reduced by only 42.65mgN/m, compared with test 1# 2 /d, illustrating competition of Anamox bacteria with NOB for NO 2 - N contributes less to NOB inhibition. In test 3# NOB activity was greatly reduced to a value of 573.33mgN/m 2 The results demonstrate that AOB and NOB compete DO for NOB to play an important role in NOB inhibition, namely that the invention proposes that NOB inhibition is realized through spatial distribution of microorganisms on a biological membrane, so that stable nitrosation anaerobic ammonia oxidation denitrification is feasible.
Finally, it should be noted that the present invention is generally described in terms of a/a pair of components, such as the location of each component and the mating relationship therebetween, however, those skilled in the art will appreciate that such location, mating relationship, etc. are equally applicable to other components/other pairs of components.
The foregoing is merely exemplary embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.
Claims (2)
1. A method for achieving stable nitrosation-anaerobic ammoxidation denitrification at moderate DO concentrations comprising: an SBR reactor (1); the SBR reactor (1) is provided with a water inlet pipe (2), a water outlet pipe (3) and an aeration pipe (5), the other end of the water inlet pipe (2) is connected with a water inlet pump (6), the other end of the water outlet pipe (3) is connected with a water outlet pump (7), and the other end of the aeration pipe (5) is connected with an aerator (9); the inside of the side wall of the SBR reactor (1) is provided with an inclined downward stirring device (8), a motor of the stirring device (8) is arranged outside the SBR reactor (1), and a stirring paddle is arranged in the inner cavity of the SBR reactor (1); the inner cavity of the SBR reactor (1) is filled with a filler (4); the filler (4) is taken from an aerobic tank of an urban sewage treatment plant, the model of the filler (4) is K3 or K5, and the specific surface area of the filler is 500-800 m 2 /m 3 The filling rate is controlled to be 15-35 percent, which is thatThe anaerobic sludge containing a certain amount of AOB-Nitrosomonas, NOB-Nitrospira and Anamox bacteria with the proportion of 0.02%, 0.40% and 0.61% in sequence, and the filler (4) is inoculated sludge of a nitrosation-anaerobic ammoxidation process; the SBR reactor (1) sequentially performs three stages of water inlet, reaction and water outlet at normal temperature, wherein a period is formed in every three stages, DO concentration is controlled to be 0.5-1.0 mg/L and HRT is controlled to be 10-20 h in the starting stage of the SBR reactor (1); in the steady operation stage of the SBR reactor (1), DO concentration is controlled to be 1.0-1.25 mg/L, and HRT is controlled to be 5-10 h; preculture of the inoculated filler (4), i.e.at a temperature of 25.+ -. 0.5℃at 50mg/LNH 4 + N is an influent substrate, the load is increased by 20 h-5 h through shortening the hydraulic retention time HRT, and the DO concentration is gradually increased from 0.5mg/L to 1.0mg/L, so that the AOB-Nitrosomonas, NOB-Nitrospira and Anamox bacteria form spatial distribution on the biological film from outside to inside, and the nitrosation-anaerobic ammonia oxidation denitrification system is successfully started.
2. The method for achieving stable nitrosation-anammox denitrification under moderate DO conditions of claim 1, wherein: the filling rate of the filler (4) in the SBR reactor (1) is controlled to be 30 percent.
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