CN116177717A - Refined denitrification control system and treatment process - Google Patents
Refined denitrification control system and treatment process Download PDFInfo
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- CN116177717A CN116177717A CN202310171504.9A CN202310171504A CN116177717A CN 116177717 A CN116177717 A CN 116177717A CN 202310171504 A CN202310171504 A CN 202310171504A CN 116177717 A CN116177717 A CN 116177717A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000010865 sewage Substances 0.000 claims abstract description 62
- 238000010992 reflux Methods 0.000 claims abstract description 55
- 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 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 41
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000001546 nitrifying effect Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 241000894006 Bacteria Species 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000001651 autotrophic effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 125000001477 organic nitrogen group Chemical group 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000001105 regulatory effect Effects 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052806 inorganic carbonate Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- 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
- C02F2209/15—N03-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
-
- 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)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a refined denitrification control system and a treatment flow, which sequentially comprise an anoxic denitrification zone and an aerobic zone for sewage denitrification treatment, wherein sewage enters the aerobic zone after passing through the anoxic denitrification zone, is split at an outlet of the aerobic zone, and part of sewage flows back to the anoxic denitrification zone again; a dosing control system for dosing a carbon source is arranged at the anoxic denitrification region; the device also comprises an ammonia nitrogen on-line instrument arranged in the anoxic denitrification area; the device also comprises a nitrate nitrogen on-line instrument and a reflux control system which are arranged in the anoxic denitrification area; according to the technical method, key data monitoring is carried out on a plurality of key nodes, the reflux quantity and the carbon source adding quantity are dynamically adjusted according to the monitoring data and corresponding control logic, the carbon source loss caused by the reflux of the nitrifying liquid is minimized while the standard of total nitrogen of the effluent is ensured, so that the balance point of the standard of the water quality of the effluent of a sewage treatment plant and the economic benefit is quickly found, the adding quantity of the carbon source is accurately controlled while the technical problem is solved, and the quality of the effluent is ensured.
Description
Technical Field
The invention relates to a sewage treatment system, in particular to a refined denitrification control system and a treatment flow.
Background
Sewage treatment refers to a process of purifying sewage to meet the water quality requirement of being discharged into a certain water body or reused. The sewage treatment is widely applied to various fields such as buildings, agriculture, traffic, energy, petrifaction, environmental protection, urban landscapes, medical treatment, catering and the like.
For municipal sewage, the total nitrogen index is the key point and the difficulty of municipal sewage treatment, and a biological denitrification method is common at present, so that nitrogen in the sewage is removed through the biological nitrification-denitrification effect to generate nitrogen; the biological nitrification means that nitrifying bacteria oxidize ammonia nitrogen into nitrate nitrogen through nitrification under aerobic conditions, and denitrifying bacteria convert nitrifying nitrogen into nitrogen through biological denitrification by using a nutritional agent under anoxic conditions, so as to realize biological denitrification; the biological denitrification comprises heterotrophic denitrification and autotrophic denitrification, wherein the heterotrophic denitrification is to reduce nitrate nitrogen into nitrogen by using heterotrophic denitrification bacteria and taking organic matters as carbon sources and electron donors. Autotrophic denitrification is to reduce nitrate nitrogen into nitrogen by using autotrophic denitrifying bacteria with inorganic carbonate as a carbon source and reducing inorganic matters as an electron donor and an energy source.
In the microbial actions of nitrification and denitrification, the carbon source is a nutrient which can meet the requirements of denitrifying bacteria in microbial denitrification reaction, and can be used for normal growth and propagation of denitrifying bacteria on one hand and providing an electron donor for denitrification reaction on the other hand, so that nitrate nitrogen is reduced into nitrogen, and the full denitrification reaction can be carried out when the general influent carbon nitrogen ratio (BOD/TKN) is about 4; when the concentration of the organic matters in the inlet water is lower (BOD/TKN is less than 4), a proper carbon source is required to be added in the sewage treatment, so that the total nitrogen value in the treated sewage is ensured to reach the standard, and the total nitrogen value of the outlet water or the change of the nitrate value of the outlet water in the aerobic section can be adjusted only according to experience in the sewage treatment process because the sewage has complex components and the values of various pollutant indexes are unstable, so that the data reach the standard; however, the carbon source adding flow and the dosage of the medicament under the control scheme are relatively extensive, the regulation hysteresis is large, and the uncertain factors are more; therefore, the change is made here, and a refined denitrification control system and a treatment flow are provided.
Disclosure of Invention
The invention aims to provide a refined denitrification control system and a treatment flow.
The technical aim of the invention is realized by the following technical scheme: the refined denitrification control system comprises an anoxic denitrification region and an aerobic region for sewage denitrification treatment in sequence, and further comprises a reflux mixing region arranged in front of the anoxic denitrification region; the sewage enters the aerobic zone after passing through the anoxic denitrification zone to be split at the outlet of the aerobic zone, and part of split sewage flows into the reflux mixing zone and then is mixed with sewage to be treated to enter the next circulation;
the anaerobic denitrification zone is provided with a reflux control system and also comprises an ammonia nitrogen on-line instrument which is arranged in the anaerobic denitrification zone and used for detecting the total nitrogen content in sewage, and the reflux control system adjusts the reflux amount of the reflux from the aerobic zone to the mixing zone through the ammonia nitrogen content displayed by the ammonia nitrogen on-line instrument;
the device also comprises a nitrate nitrogen on-line instrument arranged in the anoxic denitrification region and a dosing control system for dosing the carbon source, wherein the dosing control system controls the amount of the carbon source to be dosed into the anoxic denitrification region according to the nitrate nitrogen content displayed by the nitrate nitrogen on-line instrument.
By adopting the technical scheme, in the sewage treatment process flow, the reflux quantity from the aerobic zone to the anoxic denitrification zone determines the reduction quantity of nitrogen at the final outlet of the whole treatment system, the reduction quantity of total nitrogen is lower when the reflux quantity is smaller, and the reduction quantity of total nitrogen is higher when the reflux quantity is larger, but the reflux nitrifying liquid also carries a large amount of dissolved oxygen, so that a large amount of organic matters are consumed when the part of dissolved oxygen flows back to the front end, meanwhile, the water inflow of the anoxic tank is increased when the reflux quantity is too large, the hydraulic retention time of the anoxic tank is reduced, so that the time for denitrification is shortened, and part of carbon sources which can be used for denitrification cannot be timely utilized and directly enter the aerobic zone; the technical method for protecting the sewage treatment plant comprises the steps of monitoring and calculating key data at a plurality of key nodes, adjusting the reflux quantity and the carbon source adding quantity according to corresponding control logic, ensuring the standard of total nitrogen of the effluent, and simultaneously minimizing the carbon source loss caused by the reflux of nitrifying liquid, so that the balance point of the water quality standard and the economic benefit at the effluent of the sewage treatment plant is reached rapidly, the technical problem described in the background art is solved, the carbon source adding quantity is controlled accurately, and the water quality of the effluent is ensured to be controllable.
Preferably, the ammonia nitrogen on-line instrument is arranged at the water inlet of the anoxic denitrification region.
By adopting the technical scheme, the ammonia nitrogen on-line instrument is arranged at the water inlet of the anoxic denitrification region, and the monitored data are relatively more accurate.
Preferably, the nitrate nitrogen on-line instrument is arranged at the water outlet of the anoxic denitrification region.
By adopting the technical scheme, the nitrate nitrogen on-line instrument is arranged at the water outlet of the anoxic denitrification zone, and the monitored data are relatively more accurate.
Preferably, the method comprises the following treatment flow:
step 1: mixing sewage to be treated with reflux liquid of an aerobic zone, and introducing the mixed sewage to an anoxic denitrification zone for anoxic denitrification reaction;
step 2: the ammonia nitrogen on-line instrument detects the ammonia nitrogen content in the sewage at the inlet of the anoxic denitrification zone, and the reflux control system controls the reflux flow from the aerobic zone to the mixing zone according to the value detected by the ammonia nitrogen on-line instrument;
step 3: the method comprises the steps that a nitrate nitrogen on-line instrument detects the nitrate nitrogen content at a water outlet of an anoxic denitrification zone, and a dosing control module adds carbon sources with different amounts into the anoxic denitrification zone according to the value detected by the nitrate nitrogen on-line instrument;
step 4: and introducing the treated sewage from the anoxic denitrification zone into the aerobic zone.
Preferably, the method further comprises the step 5: and mixing the reflux liquid flowing into the mixing zone from the aerobic zone with the sewage to be treated, and then entering an anoxic denitrification zone, and repeating the steps.
In summary, the invention has the following beneficial effects:
in the method, detection equipment is arranged at key nodes of sewage treatment, so that the content of ammonia nitrogen and nitrate nitrogen in water is monitored, and the reflux amount and the carbon source addition amount are dynamically adjusted according to the monitored data; taking ammonia nitrogen data obtained after mixing the inflow water of the anoxic tank to be treated with the reflux mixed liquid as a main basis for reflux regulation, and taking the nitrate nitrogen value at the tail end of the anoxic tank as a main basis for judging the addition amount of the carbon source; double control of a reflux system and a carbon source adding system is realized, so that refined denitrification control is realized;
the control basis of the carbon source addition is nitrate nitrogen at the anoxic tail end, the denitrification degree of the reflux nitrate nitrogen amount depends on the carbon source amount capable of being supplied for denitrification, the addition amount of the carbon source is checked by using the nitrate nitrogen data at the anoxic tail end, compared with the addition amount of the carbon source which is adjusted according to the change of total nitrogen of effluent in the prior art, and the reaction time is shortened by approximately 8-10 times;
at present, municipal sewage treatment plants in the south of the Yangtze river all have the condition of imbalance of carbon-nitrogen ratio, when the carbon source of the inflow is insufficient, the total nitrogen reaches the standard in a mode of adding the carbon source in an anoxic zone, so the carbon source is an important component of the medicament cost of the sewage treatment plants, the cost input of the sewage treatment plants can be reduced to a certain extent by controlling the input amount of the carbon source, and the balance point of the water reaching the standard and the economic benefit of the sewage treatment plants is found.
Drawings
FIG. 1 is a flow chart of a process of a refined denitrification control system in an embodiment.
Description of the embodiments
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Examples
A refined denitrification control system and a treatment flow are shown in figure 1, and sequentially comprise an anoxic denitrification zone and an aerobic zone for sewage denitrification treatment, and further comprise a reflux mixing zone arranged in front of the anoxic denitrification zone; the sewage enters the aerobic zone after passing through the anoxic denitrification zone to be split at the outlet of the aerobic zone, and part of split sewage flows into the reflux mixing zone and then enters the next circulation;
a carbon source adding system and a dosing control system for adding a carbon source are arranged at the anoxic denitrification region; the dosing control module is used for controlling the amount of the carbon source to be dosed in the carbon source dosing system according to the content of the nitrate nitrogen displayed by the nitrate nitrogen on-line instrument;
the device also comprises an ammonia nitrogen on-line instrument arranged in the anoxic denitrification zone and a reflux control system, wherein the reflux control system adjusts the reflux quantity of the reflux from the aerobic zone to the mixing zone through the ammonia nitrogen content displayed in the ammonia nitrogen on-line instrument.
The ammonia nitrogen on-line instrument is arranged at the water inlet of the anoxic denitrification area, is a measuring device for detecting the ammonia nitrogen amount in the water body, is the prior art and is not described in detail herein.
The online instrument of nitrate nitrogen sets up in anoxic denitrification district delivery port department, and the online instrument of nitrate nitrogen is a equipment that is arranged in detecting the water body nitrate nitrogen content, is prior art, and the description is omitted here.
The post-treatment flow of the sewage entering the system is as follows:
step 1: mixing sewage to be treated with reflux liquid of an aerobic zone, and introducing the mixed sewage to an anoxic denitrification zone for anoxic denitrification reaction;
step 2: the method comprises the steps that a nitrate nitrogen online instrument detects the nitrate nitrogen content in sewage at an outlet of an anoxic denitrification zone, and a dosing control module controls a carbon source dosing system to add different amounts of carbon sources into the anoxic denitrification zone;
step 3: detecting the ammonia nitrogen content at the water inlet of the anoxic denitrification area by an ammonia nitrogen on-line instrument;
step 4: introducing the treated sewage from the anoxic denitrification zone into an aerobic zone;
step 5: diverting the sewage treated in the aerobic zone, and refluxing a part of sewage to a reflux liquid mixing zone, wherein a reflux control system controls the reflux flow from the aerobic zone to the mixing zone according to the value detected by an ammonia nitrogen on-line instrument;
step 6: repeating the steps, thereby controlling the total nitrogen content in the effluent to reach the standard.
Working principle:
for sewage treatment, the final nitrogen reduction amount of the whole biochemical system is determined by the reflux quantity, the reduction amount of total nitrogen is lower as the reflux quantity is smaller, but a great amount of dissolved oxygen is carried in the returned nitrified liquid, a great amount of organic matters are consumed when the part of dissolved oxygen flows back to the front end, meanwhile, the flow speed of the anoxic pond water flow is also increased by the excessive reflux quantity, the time provided for denitrification is compressed, and part of carbon sources which can be used for denitrification are not utilized in time and directly enter an aerobic zone.
The total nitrogen in the sewage mainly comprises ammonia nitrogen, nitrate nitrogen and organic nitrogen, wherein the ammonia nitrogen is the main component. After entering the anoxic zone, the mixed solution is mixed with the reflux liquid to carry out denitrification reaction, and most of nitrate nitrogen is converted into nitrogen for removal, so that the total nitrogen of the effluent of the anoxic zone mainly comprises ammonia nitrogen and a small amount of organic nitrogen and nitrate nitrogen. After entering the aerobic zone, most ammonia nitrogen in the sewage is fully converted into nitrate nitrogen through nitration reaction. Assuming that all operation conditions of the sewage plant are normal, obtaining according to conservation of nitrogen elements, wherein the sum of an ammonia nitrogen value after the reflux liquid entering the front end of the anoxic tank is mixed with the water to be treated of the anoxic tank, a nitrate nitrogen value at the tail end of the anoxic tank and an empirical coefficient is equal to the total nitrogen value of the water discharged from the aerobic tank, namely the internal control value of total nitrogen of the discharged water. The empirical coefficient is a fixed value which is respectively set for the quality characteristics of the inflow water of different sewage treatment plants. I.e. total nitrogen at the end of the anoxic tank=ammonia nitrogen at the front end of the anoxic tank+nitrate nitrogen at the end of the anoxic tank+empirical coefficient M.
According to the principle, an ammonia nitrogen on-line instrument arranged at the water inlet of the anoxic denitrification zone detects the ammonia nitrogen content in the water inlet of the anoxic zone; and detecting the content of the nitrate nitrogen in the sewage by a nitrate nitrogen on-line instrument arranged at the water outlet of the anoxic denitrification zone. The sum of these two values may be approximately equal to the total nitrogen content of the effluent; the nitrate nitrogen content is used as an independent variable of the dosing control system, and the dosing control system calculates the carbon source dosing amount according to the nitrate nitrogen data so as to control the anoxic terminal nitrate nitrogen content to be a relatively fixed value. According to the actual use condition, the adding amount of the carbon source is checked by using the nitrate nitrogen data of the anoxic terminal, although the adding amount has certain hysteresis, the method is the fastest checking means at the present stage, and compared with the method for adjusting the adding amount of the carbon source according to the change of total nitrogen of effluent, the reaction time is shortened by approximately 8-10 times, thereby realizing the fine control of denitrification. The ammonia nitrogen content is relatively fluctuated under the influence of the quality of the inlet water and is used as the only independent variable for regulating and controlling the reflux system, so that the reflux ratio can be regulated according to the change of the value of the ammonia nitrogen on-line instrument, and the total nitrogen value of the outlet water of the sewage plant is controlled within the set internal control value range through the combined regulation and control of the two systems.
For example, under the normal working condition of a sewage treatment plant, the nitrate nitrogen value at the tail end of the anoxic zone is controlled within 1mg/L through a carbon source adding system; the concentrations of the organic nitrogen and the nitrite nitrogen can be actually set according to the water quality of incoming water of each sewage treatment plant and different denitrification conditions, and the concentration is assumed to be 1 mg/L; under the condition that the total nitrogen internal control index of the sewage treatment plant is 8 mg/L, ammonia nitrogen in the anoxic zone is controlled within 6 mg/L through a reflux control system.
Claims (4)
1. A refined denitrification control system and a treatment flow sequentially comprise an anoxic denitrification area and an aerobic area for sewage denitrification treatment, and are characterized in that: the device also comprises a reflux mixing zone arranged before the anoxic denitrification zone; the sewage enters the aerobic zone after passing through the anoxic denitrification zone to be split at the outlet of the aerobic zone, and part of split sewage flows into the reflux mixing zone and then enters the next circulation;
the anaerobic denitrification zone is provided with a reflux control system and also comprises an ammonia nitrogen on-line instrument which is arranged in the anaerobic denitrification zone and used for detecting the total nitrogen content in sewage, and the reflux control system adjusts the reflux amount of the reflux from the aerobic zone to the mixing zone through the ammonia nitrogen content displayed by the ammonia nitrogen on-line instrument;
the device also comprises a nitrate nitrogen on-line instrument arranged in the anoxic denitrification region and a dosing control system for dosing the carbon source, wherein the dosing control system controls the amount of the carbon source to be dosed into the anoxic denitrification region according to the nitrate nitrogen content displayed by the nitrate nitrogen on-line instrument.
2. The refined denitrification control system and process according to claim 1, wherein: the ammonia nitrogen on-line instrument is arranged at the water inlet of the anoxic denitrification area.
3. The refined denitrification control system and process according to claim 1, wherein: the nitrate nitrogen on-line instrument is arranged at the water outlet of the anoxic denitrification area.
4. The refined denitrification control system and process according to claim 1, comprising the following process steps:
step 1: mixing sewage to be treated with reflux liquid of an aerobic zone in a reflux mixing zone, and introducing the mixed sewage to an anoxic denitrification zone for anoxic denitrification reaction;
step 2: the ammonia nitrogen on-line instrument detects the ammonia nitrogen content in the sewage at the inlet of the anoxic denitrification zone, and the reflux control system controls the reflux flow from the aerobic zone to the mixing zone according to the value detected by the ammonia nitrogen on-line instrument;
step 3: the method comprises the steps that a nitrate nitrogen on-line instrument detects the nitrate nitrogen content at a water outlet of an anoxic denitrification zone, and a dosing control system adds carbon sources with different amounts into the anoxic denitrification zone according to the value detected by the nitrate nitrogen on-line instrument;
step 4: and introducing the treated sewage from the anoxic denitrification zone into the aerobic zone.
The refined denitrification control system and process flow of claim 4, further comprising step 5: and mixing the reflux liquid flowing into the mixing zone from the aerobic zone with the sewage to be treated, and then entering an anoxic denitrification zone, and repeating the steps.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117970815A (en) * | 2024-03-29 | 2024-05-03 | 中国市政工程华北设计研究总院有限公司 | A based on predictive control flow optimization2TN prediction control method for effluent of O process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117970815A (en) * | 2024-03-29 | 2024-05-03 | 中国市政工程华北设计研究总院有限公司 | A based on predictive control flow optimization2TN prediction control method for effluent of O process |
| CN117970815B (en) * | 2024-03-29 | 2024-06-11 | 中国市政工程华北设计研究总院有限公司 | A based on predictive control flow optimization2TN prediction control method for effluent of O process |
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