CN111018110B - Sewage biochemical treatment system and control method - Google Patents
Sewage biochemical treatment system and control method Download PDFInfo
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- CN111018110B CN111018110B CN201911397864.0A CN201911397864A CN111018110B CN 111018110 B CN111018110 B CN 111018110B CN 201911397864 A CN201911397864 A CN 201911397864A CN 111018110 B CN111018110 B CN 111018110B
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- 239000010865 sewage Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 69
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 69
- 239000001301 oxygen Substances 0.000 claims abstract description 69
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000004458 analytical method Methods 0.000 claims abstract description 63
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 44
- 238000005273 aeration Methods 0.000 claims abstract description 34
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 30
- 238000010992 reflux Methods 0.000 claims description 50
- 230000000813 microbial effect Effects 0.000 abstract description 9
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 244000005700 microbiome Species 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000037353 metabolic pathway Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (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
The invention relates to the field of sewage treatment, and discloses a sewage biochemical treatment system and a control method. The sewage biochemical treatment system comprises: the biochemical reaction tank, the first control subsystem, the second control subsystem and the third control subsystem, wherein the first control subsystem comprises an oxidation-reduction potential online analysis device, a nitrifying liquid backflow control device and a controller, the second control subsystem comprises a water inlet flowmeter, a chemical oxygen demand online analysis device, a dissolved oxygen online analysis device, an aeration device and a controller, and the third control subsystem comprises a total nitrogen online analysis device, a carbon source adding device, a water inlet flowmeter and a controller. The control method adopts three control systems, wherein the first control subsystem enhances the timeliness of the microbial state regulation of the biochemical reaction tank, the second control subsystem enhances the air quantity accuracy of the aeration device, and the third control subsystem enhances the carbon source addition accuracy.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a sewage biochemical treatment system and a control method.
Background
At present, the distribution and supply of aeration quantity of a biochemical reaction tank and the distribution and addition quantity of dissolved oxygen and carbon sources in a sewage treatment process tank at home and abroad and the control of the microbial state in the biochemical tank are always difficult problems. The distribution of dissolved oxygen in the sewage treatment process directly influences the sewage treatment effect and the sludge activity property and even the effluent quality. The distribution and supply of aeration quantity by most sewage treatment plants are still remotely controlled, and errors are easy to generate; some sewage treatment plants adopt an automatic control system, a biochemical pool dissolved oxygen signal is used as a control signal, an automatic valve is used as an execution element, and the concentration of the dissolved oxygen in the aeration pool is regulated at a fixed value. The two methods have low control precision, large fluctuation of dissolved oxygen and unsatisfactory energy consumption and control effect on the living environment of the microorganisms in the biochemical pool.
A complex oxidation-reduction reaction system exists in the sewage biochemical treatment system, reflects the relative degree of the oxidation-reduction capability of the system, and simultaneously reflects the influence of the composition, pH (i.e. pH value) and temperature and the like of compound substances in the system on the oxidation-reduction capability of the system. The dissolved oxygen on-line analysis device has difficulty in functioning in anaerobic and anoxic environments, and the oxidation-reduction potential can provide reliable information for process control and biochemical state evaluation, reflecting the ecological environment in the aquarium system. The oxidation-reduction potential is an important direction of the automatic control technology of the sewage treatment plant and the precise anaerobic and anoxic control research, and has important significance for saving energy, controlling the metabolic pathway of microorganisms and improving the treatment effect. The fluctuation range of water quality and water quantity in the sewage treatment process is larger, the sewage treatment system is easy to be impacted, the aeration quantity and the carbon source addition quantity are timely and accurately adjusted according to the feedback value of the water quality detector at the measuring point so as to adapt to the change of water quality, and the energy consumption and the running cost are reduced while the environment of the biochemical tank is kept relatively dynamic and stable. In addition, aiming at the current situation that the pollutant control indexes of ammonia nitrogen, total nitrogen and total phosphorus of the domestic sewage treatment plant are improved, the traditional operation control method of the biochemical treatment process cannot ensure that the total nitrogen and the total phosphorus reach the standard stably, so that the oxidation-reduction potential of anaerobic and anoxic sections of a biochemical pool in the biochemical treatment process is required to be controlled accurately, the change condition of the microbial state is mastered, the reflux ratio of nitrifying liquid is regulated in time, and the water quality parameter of the effluent reaches the standard. The above aspects all put higher requirements on the control of the running state of the biochemical reaction tank of the sewage treatment process, and the process index needs to be precisely controlled.
Disclosure of Invention
First, the technical problem to be solved
The embodiment of the invention aims to provide a sewage biochemical treatment system and a control method, which are used for solving the technical problem of inaccurate control of a sewage treatment system in the prior art.
(II) technical scheme
In order to solve the above technical problems, an embodiment of the present invention provides a sewage biochemical treatment system, including: the biochemical reaction tank, the first control subsystem, the second control subsystem and the third control subsystem; wherein,
The first control subsystem comprises an oxidation-reduction potential online analysis device, a nitrifying liquid reflux control device and a controller, wherein the oxidation-reduction potential online analysis device is arranged on an anoxic section of the biochemical reaction tank, the nitrifying liquid reflux control device is arranged on an aerobic section of the biochemical reaction tank and is communicated with the anoxic section of the biochemical reaction tank, and the oxidation-reduction potential online analysis device and the nitrifying liquid reflux control device are respectively connected with the controller;
The second control subsystem comprises a water inlet flowmeter, a chemical oxygen demand on-line analysis device, a dissolved oxygen on-line analysis device, an aeration device and a controller, wherein the water inlet flowmeter and the chemical oxygen demand on-line analysis device are both arranged at the water inlet of the biochemical reaction tank, the dissolved oxygen on-line analysis device is arranged at the water outlet of the biochemical reaction tank, and the water inlet flowmeter, the chemical oxygen demand on-line analysis device, the dissolved oxygen on-line analysis device and the aeration device are respectively connected with the controller;
The third control subsystem comprises a total nitrogen online analysis device, a carbon source adding device, a water inlet flowmeter and a controller, wherein the total nitrogen online analysis device is arranged at the water inlet of the biochemical reaction tank, and the total nitrogen online analysis device and the carbon source adding device are respectively connected with the controller.
Wherein, the nitrifying liquid reflux control device comprises a nitrifying liquid reflux pump.
The anoxic section of the biochemical reaction tank is connected with the aerobic section of the biochemical reaction tank through a return pipeline, and the nitrifying liquid return pump is positioned at the aerobic section of the biochemical reaction tank and arranged at the inlet of the return pipeline.
The sewage biochemical treatment system further comprises a third frequency converter, and the third frequency converter is connected between the controller and the nitrifying liquid reflux pump.
The sewage biochemical treatment system further comprises a first frequency converter, wherein the carbon source adding device comprises a carbon source adding pump, and the first frequency converter is connected between the controller and the carbon source adding pump.
The sewage biochemical treatment system further comprises a second frequency converter, the aeration device comprises a fan, and the second frequency converter is connected between the controller and the fan.
The water inlet flowmeter, the total nitrogen online analysis device and the chemical oxygen demand online analysis device are sequentially connected to the water inlet of the biochemical reaction tank according to the inflow direction of sewage.
Wherein the controller is a programmable logic controller.
The invention also discloses a control method for the sewage biochemical treatment system, which comprises the following steps:
The controller receives the oxidation-reduction potential of the anoxic section monitored by the oxidation-reduction potential on-line analysis device and controls the nitrifying liquid reflux control device to adjust the nitrifying liquid reflux flow;
The controller receives the water inflow monitored by the water inflow flowmeter, the chemical oxygen demand monitored by the chemical oxygen demand on-line analysis device and the dissolved oxygen value monitored by the dissolved oxygen on-line analysis device, and controls the aeration device to adjust the air quantity;
The controller receives the water inflow monitored by the water inflow flowmeter and the total nitrogen monitored by the total nitrogen online analysis device, and controls the carbon source adding device to adjust the carbon source adding amount.
Wherein, include:
When the monitored oxidation-reduction potential of the anoxic section is lower than a potential preset value, the controller controls the nitrifying liquid reflux control device to increase nitrifying liquid reflux flow, and when the monitored oxidation-reduction potential of the anoxic section is higher than or equal to the potential preset value, the controller controls the nitrifying liquid reflux control device to decrease nitrifying liquid reflux flow;
Calculating required air quantity through the monitored water inflow and chemical oxygen demand, if the required air quantity is larger than the actual air quantity, increasing the air quantity by the controller aeration device, and if the monitored dissolved oxygen value is larger than or equal to a preset dissolved oxygen value, reducing the air quantity by the controller aeration device;
And calculating the required carbon source adding amount through the monitored total nitrogen and water inflow, wherein the controller controls the carbon source adding amount of the carbon source adding device according to the required carbon source adding amount.
(III) beneficial effects
The sewage biochemical treatment system and the control method provided by the embodiment of the invention adopt three control systems, wherein the first control subsystem enhances the timeliness of the microbial state regulation of the biochemical reaction tank, the second control subsystem enhances the air quantity accuracy of the aeration device, and the third control subsystem enhances the carbon source addition accuracy.
The first control subsystem monitors the microbial condition in the biochemical reaction tank by adopting oxidation-reduction potential, and timely adjusts the microbial environment through adjustment of the reflux quantity of nitrified liquid so as to improve the running stability of the biochemical reaction tank;
The second control subsystem adopts two index parameters of water inflow and chemical oxygen demand to carry out aeration lower limit control, thereby realizing the dynamic balance of total pollutant quantity and aeration quantity in a biochemical reaction tank in the fluctuation process of water quality and water quantity in the sewage treatment process in a targeted manner, effectively ensuring the accurate adjustment between dissolved oxygen and aeration quantity in the sewage reaction tank through the feedback control of the water outlet dissolved oxygen value of the biochemical reaction tank, and providing a good and stable living environment for microorganisms;
The second control subsystem adopts two index parameters of water inflow and total nitrogen to control, effectively ensures the dynamic balance of carbon sources in the anoxic section and/or the anaerobic section of the biochemical reaction tank in the water quality and water quantity fluctuation process in the sewage treatment process, realizes the accurate control of carbon source addition, and ensures the removal effect of total nitrogen.
Drawings
FIG. 1 is a schematic diagram of a sewage biochemical treatment system according to the present invention.
Reference numerals:
1: a water inlet flowmeter; 2: the total nitrogen online analysis device; 3: chemical oxygen demand on-line analysis device; 4: an oxidation-reduction potential on-line analysis device; 5: a dissolved oxygen on-line analysis device; 6: a nitrifying liquid reflux control device; 7: a biochemical reaction tank; 71: an anoxic section of the biochemical reaction tank; 72: an aerobic section of the biochemical reaction tank; 8: a controller; 9: a first frequency converter; 10: a second frequency converter; 11: a third frequency converter; 12: a carbon source adding pump; 13: a blower.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention discloses a sewage biochemical treatment system, which includes: the biochemical reaction tank 7, the first control subsystem, the second control subsystem and the third control subsystem; wherein,
The first control subsystem comprises an oxidation-reduction potential online analysis device 4, a nitrifying liquid reflux control device 6 and a controller 8, wherein the oxidation-reduction potential online analysis device 4 is arranged in an anoxic section 71 and/or an anaerobic section of the biochemical reaction tank, the nitrifying liquid reflux control device 6 is arranged in an aerobic section 72 of the biochemical reaction tank and is communicated with the anoxic section 71 of the biochemical reaction tank, and the oxidation-reduction potential online analysis device 4 and the nitrifying liquid reflux control device 6 are respectively connected with the controller 8;
the second control subsystem comprises a water inlet flowmeter 1, a chemical oxygen demand on-line analysis device 3, a dissolved oxygen on-line analysis device 5, an aeration device and a controller 8, wherein the water inlet flowmeter 1 and the chemical oxygen demand on-line analysis device 3 are both arranged at the water inlet of the biochemical reaction tank 7, the dissolved oxygen on-line analysis device 5 is arranged at the water outlet of the biochemical reaction tank 7, and the water inlet flowmeter 1, the chemical oxygen demand on-line analysis device 3, the dissolved oxygen on-line analysis device 5 and the aeration device are respectively connected with the controller 8;
The third control subsystem comprises a total nitrogen online analysis device 2, a carbon source adding device, a water inlet flowmeter 1 and a controller 8, wherein the total nitrogen online analysis device 2 is arranged at the water inlet of the biochemical reaction tank 7, and the total nitrogen online analysis device 2 and the carbon source adding device are respectively connected with the controller 8.
Specifically, the biochemical reaction tank 7 generally includes one or more of an aerobic section, an anoxic section, and an anaerobic section. Whereas the oxidation-reduction potential on-line analyzer 4 is generally disposed in the anoxic zone and/or the anaerobic zone, in this embodiment, disposed in the anoxic zone. The controller 8 in the first control subsystem, the second control subsystem, and the third control subsystem may use the same controller 8.
In the first control subsystem, the controller 8 can obtain the required nitrifying liquid reflux quantity through calculation according to the oxidation-reduction potential monitored by the oxidation-reduction potential on-line analysis device 4, and output signals are used for adjusting the nitrifying liquid reflux quantity by controlling the nitrifying liquid reflux control device 6, so that the oxidation-reduction potential of the anoxic section of the biochemical reaction tank 7 is ensured to be in a proper range, the optimal reflux ratio is determined, the microorganism condition of the anoxic section is ensured to be good, and the system stability is improved.
In the second control subsystem, the controller 8 calculates and controls the air quantity of the fan 13 of the aeration device through the water inflow and the chemical oxygen demand, adjusts the dissolved oxygen quantity in the biochemical reaction tank 7, compares the feedback value of the biochemical reaction water dissolved oxygen on-line analysis device 5 with a set value, further checks and adjusts the air quantity of the fan 13, and finally meets the set control precision requirement, thereby reducing the power consumption of the fan 13 and ensuring the stability of the water dissolved oxygen and the treatment effect of organic carbon in the aerobic section in the biochemical reaction tank 7.
In the third control subsystem, the controller 8 calculates the required carbon source adding amount through the water inflow and the total nitrogen amount, and controls the carbon source adding device to realize the accurate control of the carbon source adding amount of the anoxic section, so as to ensure the stable removal effect of the total nitrogen in the biochemical reaction.
According to the sewage biochemical treatment system and the control method provided by the embodiment of the invention, three control systems are adopted, the timeliness of the microbial state regulation of the biochemical reaction tank 7 is enhanced by the first control subsystem, the air quantity of the aeration device is improved by the second control subsystem, and the accuracy of the carbon source addition is improved by the third control subsystem.
The first control subsystem monitors the microbial condition in the biochemical reaction tank 7 by adopting oxidation-reduction potential, and timely adjusts the microbial environment through adjustment of the reflux quantity of nitrified liquid, so that the running stability of the biochemical reaction tank 7 is improved;
The second control subsystem adopts two index parameters of water inflow and chemical oxygen demand to carry out aeration lower limit control, thereby realizing the dynamic balance of total pollutant quantity and aeration quantity in the biochemical reaction tank 7 in the water quality and water quantity fluctuation process in the sewage treatment process in a targeted manner, effectively ensuring the accurate adjustment between the dissolved oxygen and the aeration quantity in the sewage reaction tank through the feedback control of the water outlet dissolved oxygen value of the biochemical reaction tank 7, and providing a good and stable living environment for microorganisms;
The second control subsystem adopts two index parameters of water inflow and total nitrogen to control, effectively ensures the dynamic balance of carbon sources in the anoxic section and/or the anaerobic section of the biochemical reaction tank 7 in the water quality and water quantity fluctuation process in the sewage treatment process, realizes the accurate control of carbon source addition, and ensures the removal effect of total nitrogen.
Wherein the nitrifying liquid reflux control device 6 comprises a nitrifying liquid reflux pump. The controller 8 in this embodiment controls the opening of the nitrified liquid reflux pump to control the reflux flow rate of the nitrified liquid.
Wherein, the anoxic section 71 of the biochemical reaction tank is connected with the aerobic section 72 of the biochemical reaction tank through a return pipeline, and the nitrifying liquid return pump is positioned at the aerobic section 72 of the biochemical reaction tank and is arranged at the inlet of the return pipeline. Specifically, the nitrified liquid in the embodiment flows back from the anoxic section to the aerobic section through a return pipe, and the return flow rate of the nitrified liquid is controlled by a nitrified liquid return pump.
The sewage biochemical treatment system of this embodiment further includes a third frequency converter 11, where the third frequency converter 11 is connected between the controller 8 and the nitrifying liquid reflux pump. In this embodiment, the controller 8 controls the third frequency converter 11 to realize the frequency conversion function of the nitrified liquid reflux pump and adjust the amount of reflux flow.
The sewage biochemical treatment system of this embodiment further includes a first frequency converter 9, and the carbon source adding device includes a carbon source adding pump 12, where the first frequency converter 9 is connected between the controller 8 and the carbon source adding pump 12. In this embodiment, the controller 8 controls the first frequency converter 9 to realize the frequency conversion function of the carbon source adding pump 12 and adjust the adding amount of the carbon source.
The sewage biochemical treatment system of the embodiment further comprises a second frequency converter 10, the aeration device comprises a fan 13, and the second frequency converter 10 is connected between the controller 8 and the fan 13. In this embodiment, the controller 8 controls the second frequency converter 10 to realize the frequency conversion function of the fan 13 and adjust the aeration air quantity.
Wherein, the water inlet flowmeter 1, the total nitrogen online analysis device 2 and the chemical oxygen demand online analysis device 3 are sequentially connected with the water inlet of the biochemical reaction tank 7 according to the inflow direction of sewage. In this example, the inflow rate, total nitrogen and chemical oxygen demand were measured in sequence according to the inflow direction of the sewage.
The controller 8 is a Programmable Logic Controller (PLC) and in this embodiment, the logic judgment function is implemented by the Programmable Logic Controller (PLC), and specific algorithms and judgment conditions can be determined according to actual sewage treatment needs and existing empirical formulas.
The embodiment of the invention also discloses a control method for the sewage biochemical treatment system, which comprises the following steps:
the controller 8 receives the oxidation-reduction potential of the anoxic section monitored by the oxidation-reduction potential on-line analysis device 4 and controls the nitrifying liquid reflux control device 6 to adjust the nitrifying liquid reflux flow;
The controller 8 receives the inflow water flow monitored by the inflow water flowmeter 1, the chemical oxygen demand monitored by the chemical oxygen demand on-line analysis device 3 and the dissolved oxygen value monitored by the dissolved oxygen on-line analysis device 5, and controls the aeration device to adjust the air quantity;
The controller 8 receives the inflow water flow monitored by the inflow water flow meter 1 and the total nitrogen amount monitored by the total nitrogen online analysis device 2, and controls the carbon source adding device to adjust the carbon source adding amount.
Specifically, when the monitored oxidation-reduction potential of the anoxic section is lower than the potential preset value, the controller 8 controls the nitrifying liquid reflux control device 6 to increase the nitrifying liquid reflux flow, and when the monitored oxidation-reduction potential of the anoxic section is higher than or equal to the potential preset value, the controller 8 controls the nitrifying liquid reflux control device 6 to decrease the nitrifying liquid reflux flow.
And calculating the required air quantity through the monitored water inflow and chemical oxygen demand, if the required air quantity is larger than the actual air quantity, increasing the air quantity by the aeration device of the controller 8, and if the monitored dissolved oxygen value is larger than or equal to the preset dissolved oxygen value, reducing the air quantity by the aeration device of the controller 8.
In this embodiment, the minimum air volume of the blower 13 is controlled by the inflow water flow rate and the inflow water chemical oxygen demand, and the maximum air volume of the blower 13 is controlled by the outflow water dissolved oxygen value. The lower limit value of the air quantity of the fan 13 is controlled by the water inlet flow and the chemical oxygen demand, and the water inlet flow and the chemical oxygen demand have corresponding relation with the air quantity of the fan 13, and the air quantity of the fan 13 is increased until the actual air quantity of the aeration device is larger than or equal to the calculated required air quantity. The upper limit value of the air quantity of the fan 13 is controlled by the dissolved oxygen value, the dissolved oxygen value of the discharged water is generally required to be controlled to be 1.5-3.0 mg/L, and if the dissolved oxygen value of the discharged water is higher than 3.0mg/L, the air quantity of the fan 13 is required to be properly reduced, so that the purpose of saving energy is achieved and the smooth proceeding of the subsequent reaction is ensured. In order to avoid the conflict between the upper limit and the lower limit of the air quantity of the fan 13, the numerical value of the judgment standard can be properly adjusted according to actual needs.
The required carbon source adding amount is calculated through the monitored total nitrogen and the water inlet flowmeter 1, and the controller 8 controls the carbon source adding amount of the carbon source adding device according to the required carbon source adding amount.
The carbon source adding amount in the embodiment mainly utilizes the total nitrogen, the water inflow and the water quality requirement to calculate the carbon source adding amount through an empirical formula, and a mapping relation exists between the carbon source adding amount and the total nitrogen, the water inflow and the water quality requirement. The required carbon source adding amount is calculated through an empirical formula, and the actual carbon source adding amount is controlled through the carbon source adding pump 12, so that the actual carbon source adding amount is accurately controlled in time, and the smooth and normal operation of the anoxic section of the biochemical reaction is ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (1)
1. A control method of a sewage biochemical treatment system, comprising:
The sewage biochemical treatment system comprises: the biochemical reaction tank, the first control subsystem, the second control subsystem and the third control subsystem; wherein,
The first control subsystem comprises an oxidation-reduction potential online analysis device, a nitrifying liquid reflux control device and a controller, wherein the oxidation-reduction potential online analysis device is arranged on an anoxic section of the biochemical reaction tank, the nitrifying liquid reflux control device is arranged on an aerobic section of the biochemical reaction tank and is communicated with the anoxic section of the biochemical reaction tank, and the oxidation-reduction potential online analysis device and the nitrifying liquid reflux control device are respectively connected with the controller;
The second control subsystem comprises a water inlet flowmeter, a chemical oxygen demand on-line analysis device, a dissolved oxygen on-line analysis device, an aeration device and a controller, wherein the water inlet flowmeter and the chemical oxygen demand on-line analysis device are both arranged at the water inlet of the biochemical reaction tank, the dissolved oxygen on-line analysis device is arranged at the water outlet of the biochemical reaction tank, and the water inlet flowmeter, the chemical oxygen demand on-line analysis device, the dissolved oxygen on-line analysis device and the aeration device are respectively connected with the controller;
the third control subsystem comprises a total nitrogen online analysis device, a carbon source adding device, a water inlet flowmeter and a controller, wherein the total nitrogen online analysis device is arranged at a water inlet of the biochemical reaction tank, and the total nitrogen online analysis device and the carbon source adding device are respectively connected with the controller;
the nitrifying liquid reflux control device comprises a nitrifying liquid reflux pump;
The anoxic section of the biochemical reaction tank is connected with the aerobic section of the biochemical reaction tank through a reflux pipeline, and the nitrifying liquid reflux pump is positioned at the aerobic section of the biochemical reaction tank and is arranged at the inlet of the reflux pipeline;
The control method of the sewage biochemical treatment system comprises the following steps:
The controller receives the oxidation-reduction potential of the anoxic section monitored by the oxidation-reduction potential on-line analysis device and controls the nitrifying liquid reflux control device to adjust the nitrifying liquid reflux flow;
The controller receives the water inflow monitored by the water inflow flowmeter, the chemical oxygen demand monitored by the chemical oxygen demand on-line analysis device and the dissolved oxygen value monitored by the dissolved oxygen on-line analysis device, and controls the aeration device to adjust the air quantity;
the controller receives the water inflow flow monitored by the water inflow flowmeter and the total nitrogen amount monitored by the total nitrogen online analysis device, and controls the carbon source adding device to adjust the carbon source adding amount;
When the monitored oxidation-reduction potential of the anoxic section is lower than a potential preset value, the controller controls the nitrifying liquid reflux control device to increase nitrifying liquid reflux flow, and when the monitored oxidation-reduction potential of the anoxic section is higher than or equal to the potential preset value, the controller controls the nitrifying liquid reflux control device to decrease nitrifying liquid reflux flow;
Calculating required air quantity through the monitored water inflow and chemical oxygen demand, if the required air quantity is larger than the actual air quantity, increasing the air quantity by the controller aeration device, and if the monitored dissolved oxygen value is larger than or equal to a preset dissolved oxygen value, reducing the air quantity by the controller aeration device;
And calculating the required carbon source adding amount through the monitored total nitrogen and water inflow, wherein the controller controls the carbon source adding amount of the carbon source adding device according to the required carbon source adding amount.
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| CN111675336A (en) * | 2020-07-08 | 2020-09-18 | 北京信通碧水再生水有限公司 | Segmented water inlet multistage A/O process sludge expansion control system and method |
| CN112209503B (en) * | 2020-09-15 | 2022-09-23 | 河南同生环境工程有限公司 | Oxidation ditch denitrification control system |
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