CN115231696A - Method for quickly starting shortcut nitrification - Google Patents
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- CN115231696A CN115231696A CN202210865801.9A CN202210865801A CN115231696A CN 115231696 A CN115231696 A CN 115231696A CN 202210865801 A CN202210865801 A CN 202210865801A CN 115231696 A CN115231696 A CN 115231696A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005273 aeration Methods 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims description 13
- 239000002351 wastewater Substances 0.000 claims description 13
- 239000000945 filler Substances 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 244000005700 microbiome Species 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
- 238000009825 accumulation Methods 0.000 abstract description 7
- 241000894006 Bacteria Species 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010842 industrial wastewater Substances 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 241001453382 Nitrosomonadales Species 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- 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 5
- 230000002572 peristaltic effect Effects 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 101100408454 Arabidopsis thaliana PLC6 gene Proteins 0.000 description 2
- 101100408456 Arabidopsis thaliana PLC8 gene Proteins 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 230000009935 nitrosation Effects 0.000 description 2
- 238000007034 nitrosation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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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
- C02F3/10—Packings; Fillings; Grids
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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
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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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
- C02F2101/166—Nitrites
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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
- C02F2209/02—Temperature
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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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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Abstract
The invention particularly relates to a method for quickly starting shortcut nitrification, which forms a dissolved oxygen concentration gradient difference by changing the structure of a reactor and optimizing process parameters, quickly starts shortcut nitrification and is suitable for treating various industrial wastewater and domestic sewage containing ammonia nitrogen. The reactor is divided into two spaces, namely an aeration area and a non-aeration area, by the baffle plate in the reactor, the dissolved oxygen concentration is matched with the ammonia nitrogen concentration, the aeration amount in the high ammonia nitrogen concentration area is large, the ammonia nitrogen consumption requirement is met, the ammonia nitrogen concentration is gradually reduced along with the water flow direction, the dissolved oxygen concentration of the inflow water in the flowing process in the reactor is regularly changed from high to low, the activity of NOB bacteria is reduced under the condition that the activity of AOB bacteria is not changed, and NO in the outflow water is enabled to be constant 2 ─ There is a higher accumulation of-N. The operation of the reactor can be adjusted and controlled according to the dissolved oxygen concentration by adopting an automatic control device, namely the reactor is highEffectively avoids the addition of other medicaments, reduces the cost and has higher application value.
Description
Technical Field
The invention belongs to the field of water treatment application, and particularly relates to a method for realizing shortcut nitrification, which is mainly used for conveniently and quickly realizing shortcut nitrification by adjusting the structure of a reactor, removing ammonia nitrogen in water in a more economic way, and is suitable for treating various industrial wastewater and domestic sewage containing ammonia nitrogen.
Background
With the development of social economy and science and technology, nitrogen pollutants are one of the main reasons for water body pollution and eutrophication, so that the removal of nitrogen in water bodies is of great significance for cleaning water bodies.
It is generally believed that biological denitrification is carried out by two processes, nitrification and denitrification, and that nitrification is primarily accomplished by nitrifying bacteria. Nitrifying Bacteria include two physiological flora of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB). Wherein AOB oxidizes ammonia nitrogen into nitrite nitrogen, and NOB converts nitrite nitrogen into nitrate nitrogen. In recent years, the short-cut nitrification process becomes a research hotspot, and the core of the short-cut nitrification process is to control the ammoxidation in the nitrosation stage and directly enter the subsequent denitrification. Compared with the whole-course nitrification and denitrification (ammonia nitrogen → nitrite nitrogen → nitrate nitrogen → nitrite nitrogen → nitrogen), the short-course nitrification and denitrification (ammonia nitrogen → nitrite nitrogen → nitrogen) has the characteristics of small aeration amount and small carbon source adding amount, can greatly reduce the operation cost, saves the water treatment cost, and is worthy of engineering application and popularization. But the short-cut nitrification control is complex, the nitrosation rate is low, and the stable operation is difficult. Therefore, how to improve the accumulation of nitrite nitrogen and ensure stable and efficient short-cut nitrification is a key factor for restricting the short-cut nitrification and denitrification process.
The MBBR (moving bed bio-membrane reactor) moving bed biofilm reactor has the characteristics of small floor area, low sludge production rate and stable performance, and the filler has high tolerance and long service life, and is beneficial to industrial popularization. Therefore, the short-range nitrification is started in the MBBR technology, and a solid foundation is laid for the purposes of realizing stability and high efficiency of biological denitrification, saving investment and being simple to operate.
The invention aims to provide a method for realizing short-cut nitrification, which can efficiently and conveniently realize stable short-cut nitrification, can specifically culture AOB, inhibit NOB and achieve the aims of low cost and high denitrification efficiency, and can be applied to various industrial wastewater containing ammonia nitrogen and production and domestic sewage.
Disclosure of Invention
Aiming at the problems of complex operation, unstable operation, low accumulation rate of nitrite nitrogen and the like of the conventional short-cut nitrification process, the invention provides a new idea by combining the background technology, and the main contents are as follows: a method for quickly starting shortcut nitrification.
The technical scheme of the invention is as follows:
the invention provides a method for quickly starting shortcut nitrification, which comprises the steps of firstly carrying out filling and film hanging, forming a dissolved oxygen concentration gradient difference by changing the reactor structure and optimizing process parameters after the film hanging is finished, and quickly starting shortcut nitrification. The baffle plate arranged in the reactor divides the reactor into an aeration zone and a non-aeration zone, namely a high dissolved oxygen concentration zone and a low dissolved oxygen concentration zone.
The aeration zone of the reactor adopts a bottom aeration method, the wastewater containing ammonia nitrogen enters the reactor, the liquid level of the aeration zone rises under the action of air stripping, and the water overflows to the non-aeration zone to form internal circulation. And is discharged from the water outlet pipe after the action of the microorganisms.
The baffle can move left and right, and the position of the baffle is regulated according to the dissolved oxygen concentration detected by the PLC, so that the gradient difference of the dissolved oxygen concentration is formed.
The dissolved oxygen concentration of the upper liquid surface of the non-aeration area is 1.5 to 3.5 mg/L, and the dissolved oxygen concentration of the lower liquid surface is 0.2 to 1.0 mg/L.
The baffle plate moving range comprises: 3 to 7 cm away from the bottom of the reactor and 10 to 15 cm away from the top of the reactor.
The water quality of the wastewater containing ammonia nitrogen is characterized in that the ammonia nitrogen concentration is 50-450 mg/L, and the COD value is 50-1000 mg/L.
The height of the water outlet pipe is consistent with the height of the liquid level of the non-aeration zone.
The reactor is filled with filler, the filling ratio of the filler is 20-50%, and the specific surface area is 300-800 m 2 /m 3 。
The dissolved oxygen concentration gradually decreases along with the water flow direction in the whole process. The dissolved oxygen concentration in the aeration zone is high, the ammonia nitrogen consumption requirement is met, the dissolved oxygen concentration is reduced along with the gradual reduction of the ammonia nitrogen concentration in the water flow direction, the nitrite nitrogen is prevented from being further converted into nitrate nitrogen, the accumulation of the nitrite nitrogen is realized, and the aeration energy consumption is reduced.
The filler coating is finished by using the activated sludge of a secondary sedimentation tank of a municipal sewage plant as inoculation sludge and running the reactor for 10 to 15 days, and after the reactor runs stably, the ammonia nitrogen removal load of the reactor is 0.2 to 0.5Kg N/m 3 /d。
The operation parameters are as follows: regulating the pH value to be 7.5 to 8.0 by using 1% NaOH or HCl solution; controlling the water temperature in the reactor to be 30-35 ℃ by a heating device; the invention is characterized in that the dissolved oxygen concentration on the liquid surface of the non-aeration zone is as follows: compared with the traditional single-chamber short-cut nitrification reactor, the single-chamber short-cut nitrification reactor has the advantages that the reactor is divided into the aeration zone and the non-aeration zone through the baffle plate in the reactor, the aeration amount is large in the zone with high ammonia nitrogen concentration, the ammonia nitrogen consumption requirement is met, the dissolved oxygen concentration is reduced along with the gradual reduction of the ammonia nitrogen concentration in the water flow direction, and the dissolved oxygen concentration is matched with the ammonia nitrogen concentration. In addition, the baffle is movable, and the dissolved oxygen and ammonia nitrogen concentration in the aeration area and the non-aeration area can be controlled by changing the position of the baffle, so that ammonia nitrogen wastewater with different concentrations can be treated. Compared with the traditional bottom aeration mode, the single-side aeration mode is adopted, the oxygen demand of AOB bacteria is met, and simultaneously, the single-side aeration mode has a gas stripping effect, so that the internal circulation of the reactor is promoted, the aeration energy consumption is reduced, and the cost is saved. The method for single-side aeration gas stripping reduces the influence of water conservancy fluctuation caused by aeration on the filler, and can avoid the falling of the biological membrane. The dissolved oxygen concentration of the inflow water flowing in the reactor is changed regularly from high to low, and the activity of NOB bacteria is reduced under the condition that the activity of AOB bacteria is not changed, so that NO in the outflow water 2 - N has a higher accumulation rate. The operation of the reactor can be regulated and controlled according to the dissolved oxygen concentration by adopting the automatic control device, so that the efficiency is high, the addition of other agents is avoided, the cost is reduced, and the automatic control device has higher application value.
Drawings
FIG. 1 is a diagram of a rapid start-up shortcut nitrification reaction apparatus
Reference numerals
1-a water storage tank, 2-a peristaltic pump, 3-a reactor, 4-a baffle, 5-a filler, 6-a pH meter probe, 7-a heating probe, 8-a PLC (Programmable Logic Controller), 9-acid liquid, 10-alkali liquid, 11-a water outlet, 12-a water outlet pipe, 13-an oxygen dissolving probe, 14-a sludge discharge port, 15-an aeration head, 16-an aeration zone and 17-a non-aeration zone.
Detailed Description
The invention is further illustrated by way of example in the following figures:
FIG. 1 is a diagram of a rapid start-up shortcut nitrification reactor.
The process operation flow is described as follows:
description of the reactor operating scheme: the simulated wastewater 1 enters the bottom of the aeration zone 16 of the reactor through the peristaltic pump 2, and the liquid flows upwards under the action of hydraulic power and overflows to the non-aeration zone 17 through the baffle 4 through aeration, and the dissolved oxygen continues to be gradually reduced in a flowing state. Detecting the change of the pH value in the reactor through a pH probe 6, and starting a peristaltic pump by a PLC8 to add alkali 10 when the pH value is lower than 7.5; when the dissolved oxygen of the upper liquid level is higher, the PLC8 is started, the baffle 4 moves to the aeration zone 16, otherwise, the baffle moves to the non-aeration zone 17. And discharging sludge according to the condition of the sludge peeled from the bottom of the reactor.
Example 1
The reactor of the invention is used for treating high ammonia nitrogen wastewater of a certain fertilizer plant to obtain water quality NH to be treated 4 N is 450 mg/L, COD is 200 mg/L, naHCO 3 3900 mg/L, and the pH value of inlet water is 8.5. The total volume of the reactor is 10L (12.5 × 20 × 40cm), the effective volume of the aeration zone is 2.5L, the baffle height is 30 cm, the distance from the bottom is 5 cm, the packing filling ratio is 30%, the HRT is 24 h, the short-cut nitrification is started for 18 days, and the results of the reactor after stable operation are shown in Table 1;
table 1 test results of example 1
Example 2
The reactor of the invention is used for treating urban domestic sewage, and the water quality treatment characteristic is as follows: the ammonia nitrogen is 79 mg/L, the COD is 250 mg/L, the nitrate nitrogen is 3 mg/L, the nitrite nitrogen is 0.5 mg/L, and the pH value is 7.5; the wastewater enters the bottom of the reactor through a peristaltic pump, the reactor has the total volume of 10L (12.5 x 20 x 40cm), the effective volume of an aeration zone is 2.5L, the height of a baffle plate is 30 cm, the distance from the bottom is 5 cm, the filling ratio of a filler is 30%, the HRT is 6 h, short-cut nitrification is started for 21 days, and the results of the reactor after stable operation are shown in Table 2;
table 2 test results of example 2
Example 3
The reactor of the invention is used for treating certain medical wastewater, and the water quality treatment characteristic is as follows: the ammonia nitrogen is 250 mg/L, the COD is 200 mg/L, the nitrate nitrogen is 150 mg/L, the nitrite nitrogen is 42 mg/L, and the pH value is 5.5; the waste water enters the bottom of the reactor through a peristaltic pump, the total volume of the reactor is 10L (12.5 x 20 x 40 cm), the effective volume of an aeration zone is 2.5L, the height of a baffle plate is 30 cm, the distance from the bottom is 5 cm, the filling ratio of a filler is 30%, the HRT is 16 h, the short-cut nitrification is started for 19 days, and the results of the reactor after stable operation are shown in Table 3;
table 3 test results of example 3
In the embodiment, the reactors are used for respectively treating the fertilizer wastewater, the domestic sewage and the medical wastewater, and experimental results show that the reactors have higher nitrite nitrogen accumulation rate, and the nitrite nitrogen accumulation rate exceeds 80% after the reactors are operated for 21 days.
Claims (6)
1. A method for rapidly starting shortcut nitrification is characterized in that: the reactor is divided into an aeration zone (16) and a non-aeration zone (17) by a baffle (4) arranged in the reactor (3), the aeration zone (16) adopts a bottom aeration method, the ammonia nitrogen-containing wastewater (1) enters the reactor (3), the liquid level rises under the action of air stripping, the water overflows to the non-aeration zone (17) to form internal circulation, and the ammonia nitrogen-containing wastewater is discharged from a water outlet pipe (12) after the action of microorganisms;
the baffle (4) can move left and right, and the position of the baffle (4) is regulated according to the dissolved oxygen concentration monitored by the PLC (8), so that a dissolved oxygen concentration gradient difference is formed.
2. A method of rapidly starting shortcut nitrification as claimed in claim 1, wherein: the dissolved oxygen concentration on the liquid surface of the non-aeration zone (17) is 1.5 to 3.5 mg/L, and the dissolved oxygen concentration at the low liquid surface is 0.2 to 1.0 mg/L.
3. A method of rapidly starting shortcut nitrification as claimed in claim 1, wherein: the range of movement of the baffle (4) comprises: 3 to 7 cm away from the bottom of the reactor (3) and 10 to 15 cm away from the top of the reactor (3).
4. A method of rapidly starting shortcut nitrification as claimed in claim 1, wherein: the ammonia nitrogen concentration of the wastewater (1) is 50-450 mg/L.
5. A method of rapidly starting shortcut nitrification as claimed in claim 1, wherein: the height of the water outlet pipe (12) is consistent with the liquid level of the non-aeration zone (17).
6. A method of rapidly starting shortcut nitrification as claimed in claim 1, wherein: the reactor (3) is filled with a filler (5), the filling ratio of the filler (5) is 20-50%, and the specific surface area is 300-800 m 2 /m 3 。
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| CN108439596A (en) * | 2018-04-08 | 2018-08-24 | 福建省环境科学研究院（福建省排污权储备和管理技术中心） | A kind of method of one-part form semi-hitrosation-Anammox-denitrification coupling technique processing town domestic sewage |
| CN209178188U (en) * | 2018-10-18 | 2019-07-30 | 嘉兴市六承环保科技有限公司 | A kind of anaerobic-aerobic-precipitation integral sewage-treatment plant |
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