CN112811623A - Intelligent aeration control device and method for sewage plant - Google Patents
Intelligent aeration control device and method for sewage plant Download PDFInfo
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- CN112811623A CN112811623A CN202110033148.5A CN202110033148A CN112811623A CN 112811623 A CN112811623 A CN 112811623A CN 202110033148 A CN202110033148 A CN 202110033148A CN 112811623 A CN112811623 A CN 112811623A
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- 238000005273 aeration Methods 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000010865 sewage Substances 0.000 title claims abstract description 30
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000005276 aerator Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 239000000523 sample Substances 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000006396 nitration reaction Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method 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
- C02F7/00—Aeration of stretches of water
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
An intelligent aeration control device and method for a sewage plant belong to the technical field of water treatment control. Comprises three parts, wherein the first part of an aeration system comprises a rotational flow aerator (1), a variable frequency aeration fan (2), an aeration main pipeline (3), an aeration branch pipeline (4), an aeration pipeline branch (9), an aeration connecting pipeline (10) and an electric adjusting valve (5); the second part of ammonia nitrogen measuring system comprises an ammonia nitrogen probe (6) and an ammonia nitrogen measuring instrument (7); and the third part of control system comprises an ammonia nitrogen data acquisition system, an analysis system and a regulation and control system, wherein the ammonia nitrogen data acquisition system, the analysis system and the regulation and control system are integrated together to form a control device (8). On the premise of guiding the aeration amount by theoretical calculation, ammonia nitrogen required by the discharge standard is used as an ammonia nitrogen control point at the water outlet end, and the aeration amount is regulated and controlled by the on-way ammonia nitrogen concentration in the aerobic tank, so that the nitrification process is optimized, and the intelligent aeration control of the aerobic tank is realized.
Description
Technical Field
The invention relates to a sewage treatment device, in particular to an intelligent aeration control system and method for a sewage plant.
Background
With the continuous development and progress of society, the national effluent discharge standard of sewage treatment plants is becoming stricter. Biological denitrification of sewage is a method and means commonly used by sewage treatment plants at home and abroad, so that the biological denitrification of sewage also becomes a research hotspot of scholars at home and abroad. China enters the high-speed construction period of municipal sewage treatment plants from 2006, and the problems of high operation energy consumption (large power consumption of equipment such as a fan, a reflux pump and the like) and high medicine consumption (excessive addition of an external carbon source and a chemical phosphorus removal agent) generally exist in the standard operation of the traditional sewage treatment plants. Therefore, on the basis of ensuring that the effluent quality is stable and reaches the standard to be discharged, the research on how to reduce the operation and maintenance cost of the sewage treatment plant has important guidance and reference significance for upgrading and modifying the sewage treatment plant and stably operating the sewage treatment plant.
Sewage plants generally adopt a biochemical mode to treat sewage, aeration is usually the link with the highest operating cost, and the energy consumption of aeration accounts for 50-70% of the total energy consumption of the sewage plants. Aeration control in China starts late, and manual operation and automatic monitoring are still combined when a plurality of sewage plants are used. At present, the domestic aeration control methods mainly comprise manual aeration control, semi-automatic aeration control and full-automatic aeration control. The manual operation is mainly to adjust the air volume of the blower according to the measured dissolved oxygen concentration and the effluent quality, and under the operation, the stability is poor, and the aeration rate is large and the manual labor intensity is high in order to ensure that the effluent reaches the standard as much as possible. Even if the semi-automatic aeration control realizes data transmission, the problem of high labor intensity still exists. Full-automatic aeration control is a trend of future development, but the problem of inaccurate aeration still exists in the current full-automatic aeration control, and resource waste is caused.
Disclosure of Invention
The traditional aeration device of the aerobic tank is characterized in that a microporous aeration disc or an aeration pipe is paved at the bottom, the maintenance is complex, and the operation and the maintenance are complex. The aeration control is to control the concentration of dissolved oxygen in the aerobic biochemical tank so as to control the aeration amount. The inventor of the application develops a new intelligent aeration control system and a new intelligent aeration control method through long-term research and study. (1) By arranging the cyclone aerator, the cyclone aerator is a novel aeration process which has been started in recent years, and the oxygen utilization rate is about 18 to 25 percent in a test in 6 meters of clear water. Because the device can be installed without stopping production, the service life reaches more than ten years, the device is not easy to block, the wind pressure is stable and unchanged, the energy consumption is moderate, and the device is applied to the sewage field in large area in recent years. (2) The aerobic tank needs to control reasonable aeration quantity. If the aeration quantity is too low, the nitrification process is incomplete, and the ammonia nitrogen and the total nitrogen in the effluent are overproof; the aeration rate is too high, makes dissolved oxygen concentration in the backwash liquid too high on the one hand, consumes the carbon source of anoxic section, and on the other hand can make the fan energy consumption increase. The nitrification process is controlled according to the concentration of the dissolved oxygen in the aerobic tank, the accuracy is low, the energy waste is easily caused, and the operation cost is increased. Because the nitration process oxidizes ammonia nitrogen into nitrate. Therefore, on the premise of guiding the aeration amount calculated according to theory, the ammonia nitrogen required by the discharge standard is used as an ammonia nitrogen control point at the water outlet end, and the aeration amount is regulated and controlled through the ammonia nitrogen concentration in the aerobic tank along the way, so that the nitrification process is optimized, and the accurate aeration control is realized.
The intelligent aeration control system for the sewage plant is characterized by comprising the following components in parts by weight: comprises three parts, wherein the first part of an aeration system comprises a rotational flow aerator (1), a variable frequency aeration fan (2), an aeration main pipeline (3), an aeration branch pipeline (4), an aeration pipeline branch (9), an aeration connecting pipeline (10) and an electric adjusting valve (5); the second part of ammonia nitrogen measuring system comprises an ammonia nitrogen probe (6) and an ammonia nitrogen measuring instrument (7); the third part of control system comprises an ammonia nitrogen data acquisition system, an analysis system and a regulation and control system, wherein the ammonia nitrogen data acquisition system, the analysis system and the regulation and control system are integrated together to form a control device (8);
the aeration main pipeline (3) is connected with the variable-frequency aeration fan (2), the aeration main pipeline (3) is provided with a plurality of aeration branch pipelines (4), the plurality of aeration branch pipelines (4) are distributed on two sides of the aeration main pipeline (3) and are communicated with the aeration main pipeline (3), each aeration branch pipeline (4) is provided with a plurality of aeration pipeline branches (9) and is communicated with the aeration branch pipelines (4), each aeration pipeline branch (9) is provided with an aeration connecting pipeline (10) which extends downwards to the bottom of the aerobic pool (11), and the lower end of each aeration connecting pipeline (10) is provided with a cyclone aerator (1); an electric regulating valve (5) is arranged at the joint of each aeration branch pipeline (4) and the aeration main pipeline (3); a plurality of ammonia nitrogen probes (6) are arranged in the sewage treatment tank (11) along the water flow path, and the ammonia nitrogen probes (6) are all connected with an ammonia nitrogen tester (7); the control device (8) is respectively connected with the ammonia nitrogen determinator (7), the variable-frequency aeration fan (2) and the electric regulating valve (5).
The aerobic tank (11) is divided into a plurality of lattices, the lattices are communicated in a baffling way and form a series structure along water flow, a plurality of aeration branch pipelines (4) are uniformly distributed above each lattice along the water flow path, namely, one or two aeration branch pipelines (4) are correspondingly arranged above each lattice.
The ammonia nitrogen probes (6) are uniformly distributed along the water flow path.
The working process is as follows: (1) firstly, adjusting the total aeration rate according to the ammonia nitrogen concentration of inlet and outlet water of a biochemical tank, and taking the ammonia nitrogen concentration at the tail end of an aerobic tank as a reference when the ammonia nitrogen concentration is reduced to be below a set value (the set value is changed according to different discharge standards of different regions); (2) after the total aeration rate is determined, the aeration rate of each section of the aerobic tank along the way is adjusted according to the ammonia nitrogen concentration of each section of the aerobic tank along the way, so that the nitrification process (the process of oxidizing ammonia nitrogen into nitrite nitrogen and nitrate nitrogen) is fully and completely carried out in the aerobic tank, and the aim of precise aeration control is fulfilled. In particular to an intelligent aeration control logic diagram.
Detailed description of the preferred embodiment
(1) And regulating and controlling the total aeration quantity.
The degradation sequence of pollutants in the aerobic tank is as follows: firstly, degrading organic matters, and then degrading ammonia nitrogen (namely, a nitration process) after the degradation of the organic matters is basically finished, so that whether the total aeration amount in an aerobic tank meets the requirement of microorganisms is determined by monitoring the ammonia nitrogen concentration of water at the inlet and outlet of the aerobic tank (also called the head end of the aerobic tank and the tail end of the aerobic tank), and when the ammonia nitrogen at the tail end of the aerobic tank is reduced to the discharge standard of a sewage plant, the aeration amount is proper;
(2) regulating and controlling aeration quantity along each section.
The aerobic tank needs to control reasonable aeration amount, the aeration amount is too low, the nitrification process is incomplete, and the ammonia nitrogen and the total nitrogen in the effluent water have the risk of exceeding the standard; the aeration rate is too high, makes dissolved oxygen concentration in the backwash liquid too high on the one hand, consumes the carbon source of anoxic section, and on the other hand can make the fan energy consumption increase. The nitrification process is controlled according to the concentration of the dissolved oxygen in the aerobic tank, the accuracy is low, energy waste is easily caused, and the operation cost is increased; because the nitration process oxidizes ammonia nitrogen into nitrate. Therefore, on the premise of guiding the aeration amount calculated according to theory, the aeration amount is regulated and controlled through the on-way ammonia nitrogen concentration in the aerobic tank, so that the nitrification process is optimized, and the aerobic tank can realize accurate aeration control.
Compared with the traditional aeration device and system, the invention has the following advantages:
(1) the rotational flow aerator is adopted, the oxygen utilization rate is stable and unchanged, and aeration and stirring are combined into a whole. Oxygen utilization was tested at about 18% -25% in 6 meter of clean water. Because the device can be installed and maintained without stopping production, the service life reaches more than ten years, the device is not easy to block, the wind pressure is stable and unchanged, and the energy consumption is moderate.
(2) The setting of intelligence control system sets up water outlet end ammonia nitrogen concentration limit value according to emission standard, controls the frequency conversion fan aeration rate, can realize accurate aeration, and the energy saving consumes, makes aeration fan aeration rate satisfy the microorganism demand.
(3) According to the on-way ammonia nitrogen concentration, the on-way aeration quantity of each section is controlled by adjusting an electric adjusting valve on an aeration pipeline, so that the nitrification process is optimized, and the accurate intelligent aeration control is realized.
Drawings
FIG. 1 is a schematic view of the intelligent aeration control system of the present invention.
FIG. 2 is a schematic view of the arrangement of the cyclone aerator of the present invention
FIG. 3 is a schematic diagram of a control method.
FIG. 4 shows the ammonia nitrogen change in the regulation process of the biological denitrification stage.
Detailed Description
The present invention will be described in detail below with reference to practical examples, but the present invention is not limited to the following examples.
Example 1
The specific device is shown in figure 1, three grids in total.
The newly-built project design scale of a certain sewage treatment plant is 50000m3And d. The water inlet quality and the water outlet requirement of the sewage treatment plant are shown in the table 1. The biochemical pond sludge is inoculated and domesticated by adopting activated sludge of an old factory (hydrolysis pond and SBR process).
TABLE 1 Water quality and Water discharge requirement of Sewage treatment plant
Note: (ii) emission limits between 12 and 1-3 and 31-months
Sewage plant adopts' pretreatment + modification A2The process of the sterilization of the/O + MBR + ozone measures the ammonia nitrogen concentration along the process of the aerobic tank and regulates and controls the aeration rate, the ammonia nitrogen change in the regulation process of the biological denitrification and nitrification stage is shown in figure 4, the ammonia nitrogen concentration in the aerobic tank is reduced to be below 0.5mg/L in the section 1 of the aerobic tank before regulation and control, and the aeration in the system is shown at the momentIf the amount is too large, the aeration amount needs to be reduced. Gradually adjusting air suspension blower air quantity (180 m)3/min—150m3/min—120m3/min—90m3Min) found that when the aeration amount was 90m3And when the concentration of the ammonia nitrogen in the aerobic tank is reduced in a gradient manner, and the ammonia nitrogen in the section 3 of the aerobic tank is reduced to be below 0.5mg/L, which indicates that the nitrification process in the aerobic tank is finished. Therefore, the air volume of the air suspension blower is controlled to be 90m3/min, and the aeration quantity required by the nitrification process in the aerobic tank can be met; meanwhile, the aeration rate at the tail end of the 3 sections of the aerobic tank is adjusted to be small, so that the influence of dissolved oxygen in the aerobic-anoxic reflux liquid on the denitrification process of the anoxic tank is reduced.
The ammonia nitrogen concentration along the corresponding aerobic tank under reasonable aeration quantity is shown in table 1, the aerobic tank is divided into three sections equally, and when the ammonia nitrogen concentration at the tail end of the 3 sections is reduced to be below 0.5mg/L, the aeration quantity is reasonable.
TABLE 2 Ammonia nitrogen concentration along the aerobic pool corresponding to the reasonable aeration amount
| Sampling point location | Head end of aerobic tank | |
2 segments of |
3 segments of aerobic tank |
| Ammonia nitrogen concentration (mg/L) | ＜15 | 6 | 3 | ＜0.5 |
。
Claims (4)
1. The utility model provides a sewage plant uses intelligent aeration control system which characterized in that: comprises three parts, wherein the first part of an aeration system comprises a rotational flow aerator (1), a variable frequency aeration fan (2), an aeration main pipeline (3), an aeration branch pipeline (4), an aeration pipeline branch (9), an aeration connecting pipeline (10) and an electric adjusting valve (5); the second part of ammonia nitrogen measuring system comprises an ammonia nitrogen probe (6) and an ammonia nitrogen measuring instrument (7); the third part of control system comprises an ammonia nitrogen data acquisition system, an analysis system and a regulation and control system, wherein the ammonia nitrogen data acquisition system, the analysis system and the regulation and control system are integrated together to form a control device (8);
the aeration main pipeline (3) is connected with the variable-frequency aeration fan (2), the aeration main pipeline (3) is provided with a plurality of aeration branch pipelines (4), the plurality of aeration branch pipelines (4) are distributed on two sides of the aeration main pipeline (3) and are communicated with the aeration main pipeline (3), each aeration branch pipeline (4) is provided with a plurality of aeration pipeline branches (9) and is communicated with the aeration branch pipelines (4), each aeration pipeline branch (9) is provided with an aeration connecting pipeline (10) which extends downwards to the bottom of the aerobic pool (11), and the lower end of each aeration connecting pipeline (10) is provided with a cyclone aerator (1); an electric regulating valve (5) is arranged at the joint of each aeration branch pipeline (4) and the aeration main pipeline (3); a plurality of ammonia nitrogen probes (6) are arranged in the sewage treatment tank (11) along the water flow path, and the ammonia nitrogen probes (6) are all connected with an ammonia nitrogen tester (7); the control device (8) is respectively connected with the ammonia nitrogen determinator (7), the variable-frequency aeration fan (2) and the electric regulating valve (5).
2. The intelligent aeration control system for sewage plant according to claim 1, characterized in that: the aerobic tank (11) is divided into a plurality of lattices, the lattices are communicated in a baffling way and form a series structure along water flow, a plurality of aeration branch pipelines (4) are uniformly distributed above each lattice along the water flow path, namely, one or two aeration branch pipelines (4) are correspondingly arranged above each lattice.
3. The intelligent aeration control system for sewage plant according to claim 1, characterized in that: the ammonia nitrogen probes (6) are uniformly distributed along the water flow path.
4. A method for intelligent inclusion control using the apparatus of any of claims 1-3, wherein the operation process is: (1) firstly, adjusting the total aeration rate according to the ammonia nitrogen concentration of inlet and outlet water of a biochemical tank, and taking the ammonia nitrogen concentration at the tail end of an aerobic tank to be reduced below a set value as a reference; (2) after the total aeration rate is determined, the aeration rate of each section of the aerobic tank along the process is adjusted according to the ammonia nitrogen concentration of each section of the aerobic tank along the process, so that the nitrification process is fully and completely carried out in the aerobic tank, and the aim of precise aeration control is fulfilled.
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Cited By (2)
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| CN115215438A (en) * | 2022-08-03 | 2022-10-21 | 中持水务股份有限公司 | Accurate aeration and dosing combined control method and system for multistage AO biochemical pool |
| CN116253446A (en) * | 2023-03-24 | 2023-06-13 | 青岛思普润水处理股份有限公司 | Intelligent aeration setting method for sewage treatment |
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Application publication date: 20210518 |