CN114538538A - Total nitrogen control system and method for sewage plant - Google Patents
Total nitrogen control system and method for sewage plant Download PDFInfo
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- CN114538538A CN114538538A CN202210135621.5A CN202210135621A CN114538538A CN 114538538 A CN114538538 A CN 114538538A CN 202210135621 A CN202210135621 A CN 202210135621A CN 114538538 A CN114538538 A CN 114538538A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 239000010865 sewage Substances 0.000 title claims abstract description 131
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000012545 processing Methods 0.000 claims abstract description 47
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims description 143
- 239000010802 sludge Substances 0.000 claims description 82
- 238000005273 aeration Methods 0.000 claims description 53
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 45
- 230000001276 controlling effect Effects 0.000 claims description 45
- 239000001301 oxygen Substances 0.000 claims description 45
- 229910052760 oxygen Inorganic materials 0.000 claims description 45
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 36
- 238000010992 reflux Methods 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 25
- 239000003513 alkali Substances 0.000 claims description 19
- 230000002159 abnormal effect Effects 0.000 claims description 13
- 230000003993 interaction Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000013500 data storage Methods 0.000 claims description 6
- 238000013480 data collection Methods 0.000 claims 1
- 244000005700 microbiome Species 0.000 description 8
- 241000894006 Bacteria Species 0.000 description 7
- 229910002651 NO3 Inorganic materials 0.000 description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
- 238000007726 management method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 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 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus 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
- 230000005856 abnormality Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000003066 decision tree Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 238000001243 protein synthesis Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- 230000014616 translation Effects 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
- C02F2209/16—Total nitrogen (tkN-N)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
-
- 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)
- 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 application belongs to the technical field of operation management of sewage treatment plants, and particularly relates to a total nitrogen control system and method for a sewage treatment plant; the total nitrogen control system includes: the data acquisition unit comprises a monitor of a preset type arranged at a preset position in a sewage plant and is used for acquiring water quality parameters related to total nitrogen in sewage; the processing unit is used for acquiring the water quality parameters acquired by the data acquisition unit, generating corresponding control instructions according to comparison results of the water quality parameters and corresponding preset values and sending the control instructions to the outside; and the control unit is used for receiving the control instruction sent by the processing unit and controlling the corresponding control device according to the corresponding control instruction so as to adjust the numerical value of the corresponding water quality parameter. The total nitrogen control system and method for the sewage plant can realize intelligent and accurate control and management of the sewage plant on the total nitrogen in the sewage treatment process, improve controllability and reliability of the quality of the effluent water of the municipal sewage plant, and are low in device cost, small in occupied area and high in adaptability.
Description
Technical Field
The application belongs to the technical field of operation management of sewage treatment plants, and particularly relates to a total nitrogen control system and method for a sewage treatment plant.
Background
Total Nitrogen (TN), which is the sum of the various forms of inorganic and organic nitrogen in the water. WhereinThe inorganic nitrogen typically comprises NO3 -、NO2 -And NH4 +The organic nitrogen generally comprises protein, amino acid, organic ammonia and the like, and is an important index for measuring the quality of the sewage. At present, municipal sewage treatment plants in China have strict requirements on the discharge of total nitrogen of effluent. For example, the GB18918-2002 first-class A standard requires that the TN of the effluent of the urban sewage plant is not higher than 15 mg/L. TN is often used to indicate the degree of nutrient contamination of a water body. When the nitrogen and phosphorus substances in the surface water exceed the standard, a large amount of microorganisms can propagate, and plankton grows vigorously to cause eutrophication of a water body. In the actual operation maintenance management of the sewage plant, the removal of the total nitrogen is the key point that the water quality of the effluent of the sewage plant meets the requirements of the national or local relevant standards.
The removal of total nitrogen is closely related to the influent organic concentration (COD value), biodegradability (B/C value) and carbon to nitrogen (CN) ratio. Sewage plants rely primarily on nitrification/denitrification processes for total nitrogen removal. The nitrification reaction means that ammonia nitrogen is oxidized into nitrite and nitrate by nitrifying bacteria under the aerobic condition, and the autotrophic aerobic microorganism group (nitrite bacteria and nitrate bacteria) jointly completes the nitrification reaction, namely, the ammonia nitrogen is oxidized into nitrite nitrogen and further oxidized into nitrate nitrogen. The series of oxidation is respectively completed by nitrite bacteria and nitrate bacteria, and energy is obtained from the oxidation process. Usually with CO3 2-，HCO-，CO2And inorganic carbon compounds as a carbon source. The denitrification process is that nitrite and nitrate are reduced into nitrogen by denitrifying bacteria under the anoxic condition and the nitrogen escapes from the sewage, thereby achieving the aim of removing nitrogen. Nitrate nitrogen produced by the nitration reaction is reduced by the microorganisms to nitrogen oxides or nitrogen gas. The denitrification is carried out by heterotrophic facultative anaerobic microbial population under anoxic conditions, i.e., nitrate nitrogen or nitrite is reduced to N by denitrifying bacteria when dissolved oxygen is extremely low2Or N2O。
The core of sewage treatment plants using the activated sludge process is that a large number of microorganisms in the activated sludge require a portion of nitrogen as protein synthesis in vivo during the growth process to maintain the normal growth of the microorganisms. This portion of the nitrogen in the wastewater removed during the growth of the microorganisms is nitrogen removed by assimilation. The nitrogen removed by assimilation is relatively small. Carbon C: n: ratio of phosphorus P100: 5: 1 refers to the nutrient components required for maintaining the basic viability of the microorganisms, i.e., 1/20 carbon sources are probably nitrogen removed by the microorganisms in the wastewater plant that can normally grow and reproduce. In practice, the nitrogen source contained in the wastewater is much higher than this ratio.
At present, most sewage plants complete the conversion of ammonia nitrogen into nitrate and nitrite, so that the ammonia nitrogen in effluent reaches the standard, but the total nitrogen still does not reach the standard. The upgrading and modification of the existing sewage plant mainly comprises the removal of total nitrogen, and the operation and management personnel of the sewage plant lack the technical support of the system so as to achieve the requirement of accurately controlling the discharge of the effluent total nitrogen.
Disclosure of Invention
In order to solve at least one technical problem in the prior art, the present application provides a total nitrogen control system and method for a sewage plant.
In a first aspect, the present application discloses a total nitrogen control system for a sewage plant, comprising:
the system comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit comprises a monitor of a preset type arranged at a preset position in a sewage plant and is used for acquiring water quality parameters related to total nitrogen in sewage;
the processing unit is used for acquiring the water quality parameters acquired by the data acquisition unit, generating corresponding control instructions according to comparison results of the water quality parameters and corresponding preset values and sending the control instructions to the outside;
and the control unit is used for receiving the control instruction sent by the processing unit and controlling the corresponding control device according to the corresponding control instruction so as to adjust the numerical value of the corresponding water quality parameter.
According to at least one embodiment of the present application, the data acquisition unit includes a BOD disposed at an influent water inlet of the sewage plant5An on-line monitor and a TN on-line monitor, which are respectively used for collecting the BOD of sewage at the water inlet5Values and TN values; and
the processing unit is used for acquiring the numberAccording to the BOD collected by the collection unit5Values and TN values, and calculate BOD5And the ratio of the current control command to the TN, and when the ratio is smaller than a first preset value, generating a first control command and sending the first control command to the outside;
the control unit is used for receiving the first control instruction, controlling a carbon source adding device arranged at an anaerobic reaction tank of the sewage plant according to the first control instruction, and adding a predetermined amount of carbon source into the anaerobic reaction tank.
According to at least one embodiment of the present application, the data collecting unit includes a pH meter disposed in the anaerobic reaction tank for collecting a pH value of the sewage in the anaerobic reaction tank; and
the processing unit is used for acquiring the pH value acquired by the data acquisition unit, and generating a second control instruction and sending the second control instruction to the outside when the pH value is smaller than a second preset value; and
and the control unit is used for receiving the second control instruction, controlling an alkali adding device arranged at the anaerobic reaction tank according to the second control instruction, and adding a predetermined amount of alkali into the anaerobic reaction tank.
According to at least one embodiment of the present application, the data acquisition unit comprises a first dissolved oxygen monitor disposed in the aerobic reaction tank for acquiring a first dissolved oxygen value of the wastewater in the aerobic reaction tank; and
the processing unit is used for acquiring a first dissolved oxygen value acquired by the data acquisition unit, and generating a third control instruction and sending the third control instruction to the outside when the first dissolved oxygen value is smaller than a third preset value; and
the control unit is used for receiving the third control instruction and controlling an aeration device of the sewage plant according to the third control instruction so as to adjust the aeration amount entering the aerobic reaction tank.
According to at least one embodiment of the present application, the data acquisition unit further comprises a second dissolved oxygen monitor disposed in the anaerobic reaction tank for acquiring a second dissolved oxygen value of the wastewater in the anaerobic reaction tank; and
the processing unit is also used for acquiring a second dissolved oxygen value of the sewage in the anaerobic reaction tank acquired by the data acquisition unit, and generating a fourth control instruction and sending the fourth control instruction to the outside when the second dissolved oxygen value is greater than a fourth preset value; and
the control unit is used for receiving the fourth control instruction, controlling the aeration device to adjust the aeration amount entering the aerobic reaction tank according to the fourth control instruction, and controlling the reflux device between the anaerobic reaction tank and the aerobic reaction tank to adjust the internal reflux ratio.
According to at least one embodiment of the present application, the data acquisition unit includes a first activated sludge respirator and a second activated sludge respirator respectively disposed in the anaerobic reaction tank and the aerobic reaction tank, and respectively configured to acquire a first sludge respiration rate and a second sludge respiration rate of sewage in the anaerobic reaction tank and the aerobic reaction tank; and
the processing unit is used for acquiring a first sludge respiration rate acquired by the data acquisition unit, and generating a fifth control instruction and sending the fifth control instruction to the outside when judging that the first sludge respiration rate is abnormal; and
the processing unit is also used for acquiring a second sludge respiration rate acquired by the data acquisition unit, and generating a sixth control instruction and sending the sixth control instruction to the outside when judging that the second sludge respiration rate is abnormal; and
the control unit is used for receiving the fifth control instruction and/or the sixth control instruction, and respectively controlling a sludge feeding device and a sludge discharging device which are arranged at the anaerobic reaction tank and the anaerobic reaction tank according to corresponding instructions so as to discharge the sludge in the anaerobic reaction tank and the anaerobic reaction tank, and then feeding new sludge.
According to at least one embodiment of the present application, the total nitrogen control system for a sewage plant further includes:
the data storage unit is used for storing the data acquired by the data acquisition unit;
and the human-computer interaction unit is used for displaying the parameters acquired by the data acquisition unit and the control instructions generated by the processing unit and carrying out human-computer interaction with the data acquisition unit and the processing unit.
According to at least one embodiment of the application, the carbon source adding device and the alkali adding device both comprise a storage tank and a dosing pump arranged on a discharge pipeline of the storage tank, wherein the control unit controls the corresponding dosing pump according to a corresponding control instruction; and
the aeration device comprises an aeration main pipe and a fan arranged at the inlet of the aeration main pipe, the outlet of the aeration main pipe is connected to the aerobic reaction tank through a plurality of aeration branch pipes, in addition, each aeration branch pipe is provided with an opening regulating valve, and the head of each aeration branch pipe is provided with an aeration head, wherein the control unit controls the corresponding opening regulating valve according to the corresponding control instruction; and
the reflux device comprises a reflux pump, and the control unit controls the reflux pump according to a corresponding control instruction.
In a second aspect, the present application also discloses a total nitrogen control method for a sewage plant, comprising the steps of:
step one, collecting water quality parameters related to total nitrogen in a sewage plant;
step two, comparing the water quality parameter with a corresponding preset value in advance, generating a corresponding control instruction according to a comparison result and sending the control instruction to the outside;
and step three, receiving the control instruction, and controlling a corresponding control device according to the corresponding control instruction, thereby adjusting the numerical value of the corresponding water quality parameter.
According to at least one embodiment of the present application, in the step one, at least one of the following parameters is acquired:
BOD of sewage at water inlet of sewage plant5A value and a TN value, a pH value of the sewage in the anaerobic reaction tank of the sewage plant, a first dissolved oxygen value of the sewage in the aerobic reaction tank of the sewage plant, a second dissolved oxygen value of the sewage in the anaerobic reaction tankA dissolved oxygen value, a first sludge respiration rate of the anaerobic reaction tank and a second sludge respiration rate of the sewage in the aerobic reaction tank;
correspondingly, the second step further includes at least one of the following processes:
computing BOD5And the ratio of the current control command to the TN, and when the ratio is smaller than a first preset value, generating a first control command and sending the first control command to the outside; and
when the pH value is smaller than a second preset value, generating a second control instruction and sending the second control instruction to the outside; and
when the first dissolved oxygen value is smaller than a third preset value, generating a third control instruction and sending the third control instruction to the outside; and
when the second dissolved oxygen value is larger than a fourth preset value, generating a fourth control instruction and sending the fourth control instruction to the outside; or
When the first sludge breathing rate is judged to be abnormal, generating a fifth control instruction and sending the fifth control instruction to the outside; and
when the second sludge breathing rate is judged to be abnormal, generating a sixth control instruction and sending the sixth control instruction to the outside;
correspondingly, the third step further includes at least one of the following processes:
receiving the first control instruction, controlling a carbon source adding device arranged at an anaerobic reaction tank of the sewage plant according to the first control instruction, and adding a predetermined amount of carbon source into the anaerobic reaction tank; and
receiving the second control instruction, controlling an alkali adding device arranged at the anaerobic reaction tank according to the second control instruction, and adding a predetermined amount of alkali into the anaerobic reaction tank; and
receiving the third control instruction, and controlling an aeration device of the sewage plant according to the third control instruction so as to adjust the aeration amount entering the aerobic reaction tank; and
receiving the fourth control instruction, controlling the aeration device to adjust the aeration amount entering the aerobic reaction tank according to the fourth control instruction, and controlling a reflux device between the anaerobic reaction tank and the aerobic reaction tank to adjust the internal reflux ratio; and
and receiving the fifth control instruction or the sixth control instruction, respectively controlling a sludge feeding device and a sludge discharging device which are arranged at the anaerobic reaction tank and the anaerobic reaction tank according to corresponding instructions so as to discharge the sludge in the anaerobic reaction tank and the anaerobic reaction tank, and then feeding new sludge.
The application has at least the following beneficial technical effects:
1) the total nitrogen control system and method for the sewage plant can realize intelligent and accurate control and management of the sewage plant on the total nitrogen in the sewage treatment process, improve the controllability of the municipal sewage plant, have low device cost and small occupied area, can be directly transformed according to the actual operation condition of the sewage plant, and are suitable for all municipal sewage plants;
2) according to the total nitrogen control system and method for the sewage plant, the removal process of the TN of the sewage plant is monitored in real time by monitoring parameters such as pH, BOD5, TN, dissolved oxygen and sludge respiration rate related to nitrification and denitrification reactions; in the TN removal process, when the TN removal is possibly influenced by the abnormality of a certain factor, the intelligent decision support system autonomously judges and provides a solution; the operation of the field equipment is regulated through an automatic control system, and the TN removal process is ensured to be in an optimal condition;
3) according to the total nitrogen control system and method for the sewage plant, when the TN of the effluent is not up to the standard, the equipment can be autonomously controlled and is always in the optimal working condition, namely, the control system is automatically adjusted according to the change of water quality parameters to optimize the operation mode, the operation state of the equipment is automatically balanced and optimized and adjusted, the effluent quality is ensured to be up to the standard, and the purposes of energy conservation and consumption reduction are achieved.
Drawings
FIG. 1 is a system block diagram of the claimed total nitrogen control system for a sewage plant;
FIG. 2 is a process flow diagram of the nitrification reaction section (i.e. in the aerobic reaction tank) in the total nitrogen control system and method for sewage plant of the present application;
FIG. 3 is a process flow diagram of the denitrification reaction section (i.e. in the anaerobic reaction tank) in the total nitrogen control system and method for sewage plant of the application;
FIG. 4 is a schematic structural diagram of an embodiment of the total nitrogen control system and method for sewage plant (in MBR membrane sewage treatment) in application;
wherein:
an anaerobic reaction tank 1; an aerobic reaction tank 2; a carbon source storage tank 3; an alkali storage tank 4; a fan 5; a first activated sludge respirator 6; a second activated sludge respirator 7; an aeration head 8; BOD5A sensor 9; a TN sensor 10; a first dosing pump 11; a second dosing pump 12; a reflux pump 13; a pH meter 14; an opening degree adjusting valve 15; a water inlet manifold 16; a first dissolved oxygen monitor 17; a second dissolved oxygen monitor 18.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The system and method for controlling total nitrogen for sewage plant according to the present application will be described in further detail with reference to fig. 1-4.
In a first aspect, the present application discloses a total nitrogen control system for a sewage plant that may include a data acquisition unit, a processing unit, and a control unit.
Wherein the data acquisition unit comprises a monitor of a predetermined type arranged at a predetermined position in the sewage plant for acquiring water quality parameters related to total nitrogen in the sewage.
The processing unit is used for acquiring the water quality parameters acquired by the data acquisition unit, generating corresponding control instructions according to comparison results of the water quality parameters and corresponding preset values, and sending the control instructions to the outside.
The control unit is used for receiving the control instruction sent by the processing unit and controlling the corresponding control device according to the corresponding control instruction, thereby adjusting the numerical value of the corresponding water quality parameter.
Furthermore, the specific structure of the sewage treatment system in the sewage plant can be set as required, that is, the total nitrogen control system can be used for controlling total nitrogen in various suitable sewage plants.
As shown in fig. 4, the total nitrogen control system of the present application is shown to be applied to a sewage MBR membrane treatment process of a sewage plant, i.e., in this example, the sewage plant adopts a specific structure as shown in fig. 4.
Specifically, the data acquisition unit, the processing unit and the control unit can be divided into at least the following four situations according to the acquired water quality parameter types and the corresponding processing and control means.
The first case: with reference to FIGS. 1 and 4, the data acquisition unit of the present application may include a BOD disposed at the wastewater plant inlet (e.g., at inlet manifold 16 in FIG. 4)5On-line monitor (i.e. BOD)5Sensor 9) and TN on-line monitor (namely TN sensor 10) which are respectively used for collecting BOD of sewage at the water inlet5Values and TN values. Correspondingly, the processing unit is used for acquiring the BOD acquired by the data acquisition unit5Value and TN value, and calculate BOD5And the ratio of the control command to TN, and when the ratio is less than a first preset value (namely, the carbon source is considered to be required to be added), generating a first control command and sending the first control command to the outside; preferably, the first preset value is 5 in this embodiment. Correspondingly, the control unit is used for receiving the first control instruction, controlling a carbon source adding device arranged at an anaerobic reaction tank of the sewage plant according to the first control instruction, and adding a predetermined amount of carbon source into the anaerobic reaction tank; wherein, the preferred carbon source adding device of this embodiment comprises a carbon source storage tank 3, a carbon sourceThe discharge port of the storage tank 3 is connected with a discharge pipeline, the discharge pipeline is provided with a first dosing pump 11, and the control unit controls the opening degree of the first dosing pump 11 according to a first control instruction so as to feed a carbon source.
The second case: referring to fig. 1, 3 and 4, the data collecting unit of the present application may include a pH meter 14 disposed in the anaerobic reaction tank 1 (corresponding to the denitrification reaction portion in fig. 1 to 3) for collecting the pH value of the wastewater in the anaerobic reaction tank. Correspondingly, the processing unit is used for acquiring the pH value acquired by the data acquisition unit, and when the pH value is smaller than a second preset value (at the moment, the denitrification reaction rate is greatly reduced), a second control instruction is generated and sent to the outside; in this embodiment, the second preset value is preferably 6.5 (or a range of 6.5 to 7.5 shown in the figure). Correspondingly, the control unit is used for receiving a second control instruction, controlling an alkali adding device arranged at the anaerobic reaction tank according to the second control instruction, and adding a predetermined amount of alkali into the anaerobic reaction tank; preferably, the alkali adding device in this embodiment includes an alkali storage tank 4, a discharge port of the alkali storage tank 4 is connected to a discharge pipeline, the discharge pipeline is provided with a second adding pump 12, and the control unit controls an opening of the second adding pump 12 according to a second control instruction, so as to add alkali.
The third situation: referring to fig. 1, 2 and 4, the data acquisition unit of the present application may include a first dissolved oxygen monitor 17 disposed in the aerobic reaction tank 2 (corresponding to the nitrification reaction part in fig. 1 to 3) for acquiring a first dissolved oxygen value of the sewage in the aerobic reaction tank 2. Correspondingly, the processing unit is used for acquiring the first dissolved oxygen value acquired by the data acquisition unit, and generating a third control instruction and sending the third control instruction to the outside when the first dissolved oxygen value is smaller than a third preset value (at the moment, the nitration reaction rate is influenced); preferably, the third preset value is 2mg/L in the embodiment. Correspondingly, the control unit is used for receiving a third control instruction and controlling an aeration device in the sewage plant according to the third control instruction so as to adjust the aeration amount entering the aerobic reaction tank 2 and prevent the denitrification system from being impacted by overhigh dissolved oxygen of the reflux liquid of the nitrification reaction system; wherein, the aeration device of the preferred embodiment comprises an aeration main pipe and a fan 5 arranged at the inlet of the aeration main pipe, the outlet of the aeration main pipe is connected to the aerobic reaction tank 2 through a plurality of aeration branch pipes, in addition, an opening regulating valve 15 is arranged on each aeration branch pipe, an aeration head 8 is arranged at the head of each aeration branch pipe, and the control unit controls the corresponding opening regulating valve 15 according to a third control instruction so as to regulate the aeration amount.
A fourth scenario: with reference to fig. 1, 3 and 4, the data acquisition unit of the present application may include a second dissolved oxygen monitor 18 disposed in the anaerobic reaction tank 1 for acquiring a second dissolved oxygen value of the sewage in the anaerobic reaction tank. Correspondingly, the processing unit is also used for acquiring a second dissolved oxygen value of the sewage in the anaerobic reaction tank 1 acquired by the data acquisition unit, and generating a fourth control instruction and sending the fourth control instruction to the outside when the second dissolved oxygen value is greater than a fourth preset value; in the activated sludge system, the dissolved oxygen should be kept below 0.5mg/L to ensure that the denitrification reaction is normally performed, so the fourth preset value is preferably 0.2mg/L in the embodiment. Correspondingly, the control unit is used for receiving a fourth control instruction, controlling the aeration device to adjust the aeration amount entering the aerobic reaction tank 2 according to the fourth control instruction, and simultaneously controlling the reflux device between the anaerobic reaction tank 1 and the aerobic reaction tank 2 to adjust the internal reflux ratio; in the present embodiment, it is preferable that the reflux apparatus includes a reflux pump 13, and the control unit controls the reflux pump 13 according to a fourth control command; further, the calculation formula of the internal reflux ratio is as follows:
in the formula: r is an internal reflux ratio; a is the inlet water TN concentration, and B is the outlet water TN concentration.
Fifth and sixth scenarios: with reference to fig. 1, fig. 3 and fig. 4, the data acquisition unit of the present application may include a first activated sludge respirator 6 and a second activated sludge respirator 7 respectively disposed in the anaerobic reaction tank 1 and the aerobic reaction tank 2, and respectively configured to acquire a first sludge respiration rate and a second sludge respiration rate of the sewage in the anaerobic reaction tank 1 and the aerobic reaction tank 2. Correspondingly, the processing unit is used for acquiring the first sludge respiration rate acquired by the data acquisition unit, and generating a fifth control instruction and sending the fifth control instruction to the outside when judging that the first sludge respiration rate is abnormal; and the processing unit is also used for acquiring a second sludge respiration rate acquired by the data acquisition unit, and generating a sixth control instruction and sending the sixth control instruction to the outside when judging that the second sludge respiration rate is abnormal. Correspondingly, the control unit is used for receiving the fifth control instruction and/or the sixth control instruction, and respectively controlling a sludge feeding device and a sludge discharging device which are arranged at the anaerobic reaction tank and the anaerobic reaction tank according to the corresponding instructions so as to discharge the sludge in the anaerobic reaction tank and the anaerobic reaction tank, and then feeding new sludge; the sludge feeding device and the sludge discharging device can adopt various known suitable structures, and are not described herein again.
It should be noted that one of the key factors influencing the nitrification and denitrification reactions is sludge age, and when the sludge age is too large, the sludge activity is reduced, and then the nitrification and denitrification reaction rate is greatly reduced, so that the TN removal rate is reduced. Therefore, the above determination of whether the first and second sludge respiration rates are abnormal is mainly to set a sludge respiration rate curve in the system (mainly in the processing unit) according to the historical operating data information of the sewage plant (which may be stored in the subsequent data storage unit) and the sludge respiration rate under the normal operating condition. By detecting the sludge respiration rate in the nitrification reaction and the denitrification reaction in real time, when the real-time sludge respiration rate curve starts to obviously decrease, the processing unit (middle decision tree) judges that the sludge aging phenomenon exists, namely, the processing unit starts to generate a corresponding control instruction so as to control a sludge pump to start sludge discharge and start to add and supplement new sludge.
Further, the total nitrogen control system for the sewage plant can further comprise a data storage unit and a human-computer interaction unit.
The data storage unit is used for storing the data acquired by the data acquisition unit, and a currently known database can be adopted. Further, in some embodiments, it is preferable that the data acquisition unit takes 15min as a period, and each acquired water quality parameter (water quality index) is uploaded to the data storage unit once every 15 min.
The human-computer interaction unit is used for displaying the parameters acquired by the data acquisition unit and the control instructions generated by the processing unit and is used for human-computer interaction with the data acquisition unit and the processing unit. The human-computer interaction unit can be a PC (personal computer) end, and the data acquisition unit and the processing unit can be connected to the PC end through the Internet of things, so that sewage plant operation management personnel can receive corresponding solutions and real-time water quality conditions through the personal PC end.
Further, the total nitrogen control system for the sewage plant can further comprise an alarm emergency processing module and a manual diagnosis and analysis module. When the recommended scheme (namely the generated control instruction) for the processing unit has a problem, manual intervention can be carried out, and the repaired parameters are recorded into the system to be reanalyzed by the system.
It should be noted that, in the total nitrogen control system for a sewage plant of the present application, in order to eliminate erroneous judgment caused by data errors and other factors, when the processing unit performs autonomous judgment (i.e., generates a corresponding control command), the processing unit starts to provide the control command and transmits the control command to the outside when the preset condition is reached three times in succession.
Further, between each unit device among the total nitrogen control system for sewage plant of this application, can carry out data connection through the PLC station, the PLC station can contain PLC switch board and cable.
In a second aspect, the present application further discloses a total nitrogen control method for a sewage plant, which may be implemented by using the total nitrogen control system of any one of the above first aspects, and specifically, the total nitrogen control method includes the following steps:
step one, collecting water quality parameters related to total nitrogen in a sewage plant.
And step two, comparing the water quality parameters with corresponding preset values in advance, generating corresponding control instructions according to comparison results and sending the control instructions to the outside.
And step three, receiving the control instruction, and controlling the corresponding control device according to the corresponding control instruction so as to adjust the numerical value of the corresponding water quality parameter.
Specifically, in the first step, at least one of the following parameters is acquired:
BOD of sewage at water inlet of sewage plant5The value and TN value, the pH value of the sewage in the anaerobic reaction tank of the sewage plant, the first dissolved oxygen value of the sewage in the aerobic reaction tank of the sewage plant, the second dissolved oxygen value of the sewage in the anaerobic reaction tank, the first sludge respiration rate of the anaerobic reaction tank and the second sludge respiration rate of the sewage in the aerobic reaction tank.
Correspondingly, the step two also comprises at least one of the following processes:
calculate BOD5And the ratio of the current value to the TN, and when the ratio is smaller than a first preset value, generating a first control instruction and sending the first control instruction to the outside; and
when the pH value is smaller than a second preset value, generating a second control instruction and sending the second control instruction to the outside; and
when the first dissolved oxygen value is smaller than a third preset value, generating a third control instruction and sending the third control instruction to the outside; and
when the second dissolved oxygen value is larger than a fourth preset value, generating a fourth control instruction and sending the fourth control instruction to the outside; or
When the first sludge breathing rate is judged to be abnormal, a fifth control instruction is generated and sent to the outside; and
and when the second sludge breathing rate is judged to be abnormal, generating a sixth control instruction and sending the sixth control instruction to the outside.
Correspondingly, the step three further includes at least one of the following processes:
receiving a first control instruction, controlling a carbon source adding device arranged at an anaerobic reaction tank of the sewage plant according to the first control instruction, and adding a predetermined amount of carbon source into the anaerobic reaction tank; and
receiving a second control instruction, controlling an alkali adding device arranged at the anaerobic reaction tank according to the second control instruction, and adding a predetermined amount of alkali into the anaerobic reaction tank; and
receiving a third control instruction, and controlling an aeration device in the sewage plant according to the third control instruction so as to adjust the aeration amount entering the aerobic reaction tank; and
receiving a fourth control instruction, controlling an aeration device to adjust the aeration amount entering the aerobic reaction tank according to the fourth control instruction, and controlling a reflux device between the anaerobic reaction tank and the aerobic reaction tank to adjust the internal reflux ratio; and
and receiving a fifth control instruction or a sixth control instruction, respectively controlling a sludge feeding device and a sludge discharging device which are arranged at the anaerobic reaction tank and the anaerobic reaction tank according to the corresponding instructions so as to discharge the sludge in the anaerobic reaction tank and the anaerobic reaction tank, and then feeding new sludge.
Finally, the total nitrogen control system and method for sewage plants of the present application will be further described in a specific application case.
Application case
The total nitrogen control system and method for the sewage plant are applied to upgrading and transformation of an intelligent system of the sewage plant in a certain town, accurate control of total nitrogen is achieved, total nitrogen removal rate can be effectively improved, and the effluent total nitrogen is guaranteed to reach the standard.
The design scale of the water plant is 5 multiplied by 104m3D is calculated as the ratio of the total weight of the composition. Activated sludge is directly added for inoculation, the biochemical tank reaches the designed sludge concentration and starts to feed and discharge water under full load. At the initial stage of the debugging, the COD of the influent water is 187mg/L, BOD5107mg/L and TN 53.2 mg/L. The pH value of the effluent is 6-8, the COD is 26.7mg/L, and BOD53.6mg/L, 2.1mg/L SS, 0.18mg/L ammonia nitrogen, 15.13mg/L TN and 0.12mg/L TP.
The water plant has higher operation cost and the TN slightly exceeds the standard, but the TN concentration of the effluent water gradually rises along with the increase of the operation time, and the problems of low biological denitrification efficiency and high operation cost mainly exist in the initial operation stage of the sewage plant, which indicates that the operation parameters of the biochemical system at present need to be optimized.
The total nitrogen control system and the method are used for transforming the water plant, the aeration quantity of the nitrification reaction system is judged to be insufficient by the processing unit, and the COD of the inlet water is low, so the COD can reach the standard, but the TN removal rate is not ideal, the aeration quantity is too low, the nitrification process is incomplete, and the ammonia nitrogen and the total nitrogen in the outlet water have the risk of exceeding the standard; the aeration rate is too high, makes dissolved oxygen 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.
After the judgment of the processing unit, the fan of the control system is controlled, the aerobic pool is divided into 3 sections, and the air volume of the fan is gradually adjusted to 90m3Min, simultaneously reducing the air quantity of the 3 rd section fan to 30m3And/min, preventing the dissolved oxygen in the aerobic-anoxic reflux liquid from aerobic to anoxic reflux liquid from influencing the denitrification process of the anoxic tank. The reflux ratio was determined to be 350% after calculation, thus increasing the reflux from the aerobic zone to the anoxic zone from the design reflux ratio (200%) to 350%. After the effluent is regulated, TN is stabilized at 8.44mg/L, and the effluent is guaranteed to reach the standard.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A total nitrogen control system for a wastewater plant, comprising:
the system comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit comprises a monitor of a preset type arranged at a preset position in a sewage plant and is used for acquiring water quality parameters related to total nitrogen in sewage;
the processing unit is used for acquiring the water quality parameters acquired by the data acquisition unit, generating corresponding control instructions according to comparison results of the water quality parameters and corresponding preset values and sending the control instructions to the outside;
and the control unit is used for receiving the control instruction sent by the processing unit and controlling the corresponding control device according to the corresponding control instruction so as to adjust the numerical value of the corresponding water quality parameter.
2. Root of herbaceous plantThe total nitrogen control system for a sewage plant of claim 1, wherein the data acquisition unit includes a BOD disposed at an inlet water of the sewage plant5An on-line monitor and a TN on-line monitor, which are respectively used for collecting the BOD of sewage at the water inlet5Values and TN values; and
the processing unit is used for acquiring the BOD acquired by the data acquisition unit5Values and TN values, and calculate BOD5And the ratio of the current control command to the TN, and when the ratio is smaller than a first preset value, generating a first control command and sending the first control command to the outside;
the control unit is used for receiving the first control instruction, controlling a carbon source adding device arranged at an anaerobic reaction tank of the sewage plant according to the first control instruction, and adding a predetermined amount of carbon source into the anaerobic reaction tank.
3. The total nitrogen control system for a sewage plant of claim 1, wherein the data collecting unit includes a pH meter provided in the anaerobic reaction tank for collecting a pH value of the sewage in the anaerobic reaction tank; and
the processing unit is used for acquiring the pH value acquired by the data acquisition unit, and generating a second control instruction and sending the second control instruction to the outside when the pH value is smaller than a second preset value; and
and the control unit is used for receiving the second control instruction, controlling an alkali adding device arranged at the anaerobic reaction tank according to the second control instruction, and adding a predetermined amount of alkali into the anaerobic reaction tank.
4. The total nitrogen control system for sewage plants of claim 1, wherein said data acquisition unit comprises a first dissolved oxygen monitor disposed in said aerobic reaction tank for acquiring a first dissolved oxygen value of the sewage in said aerobic reaction tank; and
the processing unit is used for acquiring a first dissolved oxygen value acquired by the data acquisition unit, and generating a third control instruction and sending the third control instruction to the outside when the first dissolved oxygen value is smaller than a third preset value; and
the control unit is used for receiving the third control instruction and controlling an aeration device of the sewage plant according to the third control instruction so as to adjust the aeration amount entering the aerobic reaction tank.
5. The total nitrogen control system for a sewage plant of claim 4, wherein the data collection unit further comprises a second dissolved oxygen monitor disposed in the anaerobic reaction tank for collecting a second dissolved oxygen value of the sewage in the anaerobic reaction tank; and
the processing unit is also used for acquiring a second dissolved oxygen value of the sewage in the anaerobic reaction tank acquired by the data acquisition unit, and generating a fourth control instruction and sending the fourth control instruction to the outside when the second dissolved oxygen value is greater than a fourth preset value; and
the control unit is used for receiving the fourth control instruction, controlling the aeration device to adjust the aeration amount entering the aerobic reaction tank according to the fourth control instruction, and controlling the reflux device between the anaerobic reaction tank and the aerobic reaction tank to adjust the internal reflux ratio.
6. The total nitrogen control system for a sewage plant according to claim 1, wherein the data acquisition unit comprises a first activated sludge respirometer and a second activated sludge respirometer respectively disposed in the anaerobic reaction tank and the aerobic reaction tank for acquiring a first sludge respiration rate and a second sludge respiration rate of the sewage in the anaerobic reaction tank and the aerobic reaction tank, respectively; and
the processing unit is used for acquiring a first sludge respiration rate acquired by the data acquisition unit, and generating a fifth control instruction and sending the fifth control instruction to the outside when judging that the first sludge respiration rate is abnormal; and
the processing unit is also used for acquiring a second sludge respiration rate acquired by the data acquisition unit, and generating a sixth control instruction and sending the sixth control instruction to the outside when judging that the second sludge respiration rate is abnormal; and
the control unit is used for receiving the fifth control instruction and/or the sixth control instruction, and respectively controlling a sludge feeding device and a sludge discharging device which are arranged at the anaerobic reaction tank and the anaerobic reaction tank according to corresponding instructions so as to discharge the sludge in the anaerobic reaction tank and the anaerobic reaction tank, and then feeding new sludge.
7. The total nitrogen control system for a sewage plant according to any one of claims 1-6, further comprising:
the data storage unit is used for storing the data acquired by the data acquisition unit;
and the human-computer interaction unit is used for displaying the parameters acquired by the data acquisition unit and the control instructions generated by the processing unit and carrying out human-computer interaction with the data acquisition unit and the processing unit.
8. The total nitrogen control system for a sewage plant of claim 7, wherein the carbon source adding device and the alkali adding device each comprise a storage tank and a dosing pump arranged on a discharge pipeline of the storage tank, wherein the control unit controls the corresponding dosing pump according to a corresponding control instruction; and
the aeration device comprises an aeration main pipe and a fan arranged at the inlet of the aeration main pipe, the outlet of the aeration main pipe is connected to the aerobic reaction tank through a plurality of aeration branch pipes, in addition, each aeration branch pipe is provided with an opening regulating valve, and the head of each aeration branch pipe is provided with an aeration head, wherein the control unit controls the corresponding opening regulating valve according to the corresponding control instruction; and
the reflux device comprises a reflux pump, and the control unit controls the reflux pump according to a corresponding control instruction.
9. A total nitrogen control method for a sewage plant is characterized by comprising the following steps:
step one, collecting water quality parameters related to total nitrogen in a sewage plant;
step two, comparing the water quality parameter with a corresponding preset value in advance, generating a corresponding control instruction according to a comparison result and sending the control instruction to the outside;
and step three, receiving the control instruction, and controlling the corresponding control device according to the corresponding control instruction so as to adjust the numerical value of the corresponding water quality parameter.
10. The total nitrogen control method for sewage plants according to claim 9, characterized in that in said first step, at least one of the following parameters is collected:
BOD of sewage at water inlet of sewage plant5A value and a TN value, a pH value of the sewage in the anaerobic reaction tank of the sewage plant, a first dissolved oxygen value of the sewage in the aerobic reaction tank of the sewage plant, a second dissolved oxygen value of the sewage in the anaerobic reaction tank, a first sludge respiration rate of the anaerobic reaction tank, and a second sludge respiration rate of the sewage in the aerobic reaction tank;
correspondingly, the second step further includes at least one of the following processes:
calculate BOD5And the ratio of the current control command to the TN, and when the ratio is smaller than a first preset value, generating a first control command and sending the first control command to the outside; and
when the pH value is smaller than a second preset value, generating a second control instruction and sending the second control instruction to the outside; and
when the first dissolved oxygen value is smaller than a third preset value, generating a third control instruction and sending the third control instruction to the outside; and
when the second dissolved oxygen value is larger than a fourth preset value, generating a fourth control instruction and sending the fourth control instruction to the outside; or
When the first sludge breathing rate is judged to be abnormal, generating a fifth control instruction and sending the fifth control instruction to the outside; and
when the second sludge breathing rate is judged to be abnormal, generating a sixth control instruction and sending the sixth control instruction to the outside;
correspondingly, the third step further includes at least one of the following processes:
receiving the first control instruction, controlling a carbon source adding device arranged at an anaerobic reaction tank of the sewage plant according to the first control instruction, and adding a predetermined amount of carbon source into the anaerobic reaction tank; and
receiving the second control instruction, controlling an alkali adding device arranged at the anaerobic reaction tank according to the second control instruction, and adding a predetermined amount of alkali into the anaerobic reaction tank; and
receiving the third control instruction, and controlling an aeration device of the sewage plant according to the third control instruction so as to adjust the aeration amount entering the aerobic reaction tank; and
receiving the fourth control instruction, controlling the aeration device to adjust the aeration amount entering the aerobic reaction tank according to the fourth control instruction, and controlling a reflux device between the anaerobic reaction tank and the aerobic reaction tank to adjust the internal reflux ratio; and
and receiving the fifth control instruction or the sixth control instruction, respectively controlling a sludge feeding device and a sludge discharging device which are arranged at the anaerobic reaction tank and the anaerobic reaction tank according to corresponding instructions so as to discharge the sludge in the anaerobic reaction tank and the anaerobic reaction tank, and then feeding new sludge.
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