CN110127863A - The accurate dosing system of carbon source and method - Google Patents
The accurate dosing system of carbon source and method Download PDFInfo
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- CN110127863A CN110127863A CN201910555235.XA CN201910555235A CN110127863A CN 110127863 A CN110127863 A CN 110127863A CN 201910555235 A CN201910555235 A CN 201910555235A CN 110127863 A CN110127863 A CN 110127863A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 193
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 53
- 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 187
- 239000010865 sewage Substances 0.000 claims abstract description 85
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 93
- 244000241872 Lycium chinense Species 0.000 claims description 27
- 235000015468 Lycium chinense Nutrition 0.000 claims description 27
- 238000005259 measurement Methods 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 1
- 230000008569 process Effects 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 12
- 239000003814 drug Substances 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a kind of accurate dosing system of carbon source and methods, comprising: online flowmeter of intaking is electrically connected with control device；Feedover nitrate nitrogen in-line meter, is electrically connected with control device；Nitrate nitrogen in-line meter is fed back, is electrically connected with control device；Frequency conversion dosing pump and dosing flowmeter are electrically connected with control device；Control device, it can be according to the inflow signal of online flowmeter feedback and the nitrate nitrogen feed-forward signal of feedforward nitrate nitrogen in-line meter feedback of intaking, and the nitrate nitrogen feedback signal according to feedback nitrate nitrogen in-line meter feedback, it adjusts the frequency of frequency conversion dosing pump and the carbon source according to dosing flowmeter adds feedback signal, to adjust the carbon source dosage to sewage disposal system.The system and method can be with the NO of denitrification system3To control variable, is added by feedforward and feedback control carbon source, there is the advantages of stable, to lower carbon source dosage.
Description
Technical Field
The invention relates to the field of carbon source adding in a sewage treatment process, in particular to a system and a method for accurately adding a carbon source.
Background
At present, due to the rapid development of society, the strength of urbanization construction is increased, the operation of urban sewage treatment plants enters an efficient operation period, along with the improvement of economic levels in various regions, the increase of environmental pressure, the improvement of discharge standards and the increase of the strength of environmental protection law enforcement, particularly the over-high discharge requirements of TN and TP cause eutrophication of water bodies. The standard-reaching discharge pressure of the sewage treatment plant is increased, and meanwhile, the enterprise synergy is faced, the development is carried out in the directions of energy conservation, consumption reduction and the like, and the social energy conservation and emission reduction target is responded. The denitrification process of the urban sewage treatment plant is mainly provided with an anoxic tank, a denitrification filter tank and the like, so that the denitrification generated after the ammonia nitrogen is nitrified can generate denitrification in the process section to generate N2The aim of denitrification is achieved. Carbon sources carried in sewage generally can meet the denitrification requirement, but meet the requirement of high discharge standard, an external carbon source adding mode is usually required, the added external carbon source is generally acetic acid or sodium acetate, the adding mode is mainly constant adding, manual adjustment is performed according to the treatment effect, and the conditions that TN exceeds the standard due to untimely water quality and water quantity fluctuation adjustment, the adding amount is too large and the like often occur.
At present, aiming at the research of medicament addition control, most of the medicaments are regulated based on the feedback control of nitrate nitrogen, but the single feedback control is greatly influenced by water quality and water quantity, a control system is often greatly delayed, the hysteresis influence is large, and the system regulation effect is poor; with the development of an automatic control process control system, feedforward control is added to solve the problems of water quantity and water quality fluctuation and the like, but the chemical demand (COD) and ammonia Nitrogen (NH) of inlet water under the condition of water quality fluctuation also exist3) The instrument can not respond in real time, the failure rate of the instrument is high, and the reliability of the instrument is influenced to a certain extent, so that the deviation of a control system exists.
Therefore, under the promotion of energy conservation and consumption reduction of sewage treatment and up-to-standard process, the problem to be solved is how to accurately control the addition of the carbon source so as to help the sewage treatment plant to operate efficiently and stably.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a system and a method for accurately adding a carbon source, which can solve the problem that the efficient and stable operation of a sewage treatment plant cannot be ensured due to poor control accuracy of an external carbon source in the existing sewage treatment.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides an accurate carbon source adding system, which comprises:
the system comprises an online water inlet flowmeter, a control device, a feedforward nitrate nitrogen online instrument, a feedback nitrate nitrogen online instrument, a variable-frequency dosing pump and a dosing flowmeter; wherein,
the water inlet online flowmeter is arranged on a water inlet pipe of the pre-denitrification system for sewage treatment or the post-denitrification system for sewage treatment, and the feedback end of the water inlet online flowmeter is electrically connected with the control device;
the feed-forward nitrate nitrogen online instrument is arranged at the front end in an anoxic tank of the sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feed-forward nitrate nitrogen online instrument is electrically connected with the control device;
the nitrate nitrogen feedback online instrument is arranged at the rear end in an aerobic tank of the pre-denitrification system for sewage treatment or a denitrification filter tank of the post-denitrification system for sewage treatment, and the feedback end of the nitrate nitrogen feedback online instrument is electrically connected with the control device;
the variable-frequency dosing pump and the dosing flowmeter are sequentially arranged on a carbon source dosing pipeline of an anoxic tank of the pre-denitrification system for sewage treatment or a denitrification filter tank of the post-denitrification system for sewage treatment, the variable-frequency control end of the variable-frequency dosing pump is electrically connected with the control device, and the feedback end of the dosing flowmeter is electrically connected with the control device;
the control device can adjust the frequency of the variable-frequency dosing pump and adjust the carbon source dosing amount of the sewage treatment system according to the water inflow signal fed back by the water inflow online flowmeter, the nitrate nitrogen feed-forward signal fed back by the feed-forward nitrate nitrogen online instrument and the nitrate nitrogen feedback signal fed back by the feed-back nitrate nitrogen online instrument.
The embodiment of the invention also provides a method for accurately adding the carbon source, and the system for accurately adding the carbon source comprises the following steps:
determining whether the accurate carbon source adding system is used for a pre-denitrification system for sewage treatment or a post-denitrification system for sewage treatment, and if the accurate carbon source adding system is used for the pre-denitrification system for sewage treatment, controlling the carbon source adding by a control device of the system according to the step 1; if the system is used for the post-denitrification system for sewage treatment, a control device of the system controls the addition of the carbon source according to the step 2;
step 1, the carbon source adding control for the pre-denitrification system for sewage treatment comprises the following steps:
(A) carbon source main feedback control: performing PID feedback control on the flow q of the dosing flowmeter according to the deviation between the set value of the feedforward nitrate nitrogen online instrument and the real-time measured value of the feedforward nitrate nitrogen online instrument, and controlling the dosing pump frequency to reach the set value of the feedforward nitrate nitrogen online instrument according to the flow q feedback control; the method for determining the set value of the feedforward nitrate nitrogen online instrument comprises the following steps: according to the real-time measured value of the feedback nitrate nitrogen online instrument, the set value of the feed-forward nitrate nitrogen online instrument is calculated according to the following fitting formula: n is a radical of1 is provided with＝m×N2 fact+ n; wherein: n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; m, n: in order to obtain coefficients according to test tests, the value of m is generally-1 to-0.25, and the value of n is 2.5 to 10;
(B) carbon source feedforward compensation control: after the inflow Q of the pre-denitrification system for sewage treatment exceeds a preset amplitude, carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q. q.sq＝q×(QFruit of Chinese wolfberry/QIs provided with-1); wherein: q. q.sqThe feed-forward compensation amount of the carbon source is used; q is the amount of carbon source added for real-time main feedback; qIs provided withDesigning the water inlet flow; qFruit of Chinese wolfberryActual water inlet flow rate;
(C) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN discharge standard of the sewage treatment pre-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument according to the real-time measured value of the feedback nitrate nitrogen online instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isfThe feedback compensation amount of the carbon source is used; qFruit of Chinese wolfberryActual water inlet flow rate; n is a radical of2 factReal-time measurement value of the nitrate nitrogen on-line instrument is fed back; n is a radical of2 is provided withThe set value of the nitrate nitrogen on-line instrument is fed back; k0The adding coefficient is constant 4;
step 2, the carbon source adding control for the sewage treatment post-denitrification system comprises the following steps:
(D) feed-forward feeding control: determining the feed-forward feeding carbon source amount according to a feed-forward feeding model formula, wherein the feed-forward feeding model formula is as follows: q ═ K0×QInto×(N1 fact-N1 is provided with) (ii) a Wherein, q: adding carbon source amount for feedforward; qInto: is the actual water inlet flow; n is a radical of1 fact: the method is a real-time measurement value of a feed-forward nitrate nitrogen online instrument; n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; k0The adding coefficient is constant 4;
(E) carbon source feedback compensation control: according to the effluent of the sewage treatment post-denitrification systemAnd the TN emission standard is set with a set value of the feedback nitrate nitrogen online instrument, carbon source feedback compensation is carried out after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument, and the carbon source feedback compensation amount is determined according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isf: feeding back compensation amount for carbon source; qFruit of Chinese wolfberry: is the actual water inlet flow; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; n is a radical of2 is provided with: feeding back the set value of the nitrate nitrogen online instrument; k0The value of the addition coefficient is constant 4.
According to the technical scheme provided by the invention, the accurate carbon source adding system and the accurate carbon source adding method provided by the embodiment of the invention have the beneficial effects that:
by arranging the organically connected water inlet on-line flow meter, the control device, the feedforward nitrate nitrogen on-line instrument, the feedback nitrate nitrogen on-line instrument, the variable-frequency dosing pump and the dosing flow meter, the NO based on the denitrification system can be realized3In order to control variables, the carbon source adding is controlled through feedforward and feedback, so that the problem of delay adjustment of a denitrification system caused by water quantity and water quality fluctuation is solved well, the disturbance of large fluctuation and large delay to the system and the influence of the system delay on stable standard reaching of TN are solved, the system and the method can reduce the dosage of carbon source adding agents, and the operation intensity can be greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a carbon source precise dosing system for a pre-denitrification system for sewage treatment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a carbon source precise dosing system for a post-denitrification system for sewage treatment according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for accurately adding a carbon source by using the system for accurately adding a carbon source shown in FIG. 1;
FIG. 4 is a flow chart of a method for accurately adding a carbon source by using the system for accurately adding a carbon source shown in FIG. 2;
the labels in fig. 1, 2 are: 1-a control device; 10-automatic control cabinet; 11-electrical cabinet equipment switch; 12-a contactor; 13-a connecting terminal; 14-a frequency converter; 15-an industrial personal computer; 2-frequency conversion dosing pump; 21-adding a medicine flow meter; 3-water outlet pipe; 31-feedforward nitrate nitrogen on-line instrument; 32-feeding back nitrate nitrogen on-line instrument; 4-water inlet pipe; 41-water inflow online flowmeter; 5-anoxic pond; 6-an aerobic tank; 7-denitrification filter.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
As shown in fig. 1 or fig. 2, an embodiment of the present invention provides an accurate carbon source adding system, which is suitable for controlling carbon source adding amount of a denitrification system of a municipal sewage treatment plant, and can improve a medicament adding control level and effectively reduce medicament consumption cost, and the accurate carbon source adding system includes:
the system comprises an online water inlet flowmeter, a control device, a feedforward nitrate nitrogen online instrument, a feedback nitrate nitrogen online instrument, a variable-frequency dosing pump and a dosing flowmeter; wherein,
the online inflow water flow meter is arranged on a water inlet pipe of a pre-denitrification system (such as an AAO system) for sewage treatment or a post-denitrification system (such as a denitrification filter system) for sewage treatment, and the feedback end of the online inflow water flow meter is electrically connected with the control device;
the feed-forward nitrate nitrogen online instrument is arranged at the front end in an anoxic tank of the sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feed-forward nitrate nitrogen online instrument is electrically connected with the control device;
the nitrate nitrogen feedback online instrument is arranged at the tail end in an aerobic tank of the sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the nitrate nitrogen feedback online instrument is electrically connected with the control device;
the variable-frequency dosing pump and the dosing flowmeter are sequentially arranged on a carbon source dosing pipeline of an anoxic tank of the pre-denitrification system for sewage treatment or a denitrification filter tank of the post-denitrification system for sewage treatment, the variable-frequency control end of the variable-frequency dosing pump is electrically connected with the control device, and the feedback end of the dosing flowmeter is electrically connected with the control device;
the control device can adjust the frequency of the variable-frequency dosing pump and adjust the carbon source dosing amount of the sewage treatment system according to the water inflow signal fed back by the water inflow online flowmeter, the nitrate nitrogen feed-forward signal fed back by the feed-forward nitrate nitrogen online instrument and the nitrate nitrogen feedback signal fed back by the feed-back nitrate nitrogen online instrument.
In the system, the control device consists of an industrial personal computer and an automatic control cabinet which are in communication connection;
the automatic control cabinet is respectively and electrically connected with the variable-frequency dosing pump, the water inlet online flowmeter, the first nitrate nitrogen online instrument and the second nitrate nitrogen online instrument.
In the system, the water inlet online flowmeter adopts an electromagnetic flowmeter.
In the system, the control device can adjust the frequency of the variable-frequency dosing pump to adjust the carbon source dosing amount of the sewage treatment system according to the water inflow signal fed back by the water inflow online flowmeter, the nitrate nitrogen feed-forward signal fed back by the feed-forward nitrate nitrogen online instrument and the nitrate nitrogen feedback signal fed back by the feed-back nitrate nitrogen online instrument,
if the device is used for a pre-denitrification system for sewage treatment, the control mode of the control device comprises the following steps (see figure 3):
(A) carbon source main feedback control: performing PID feedback control on the flow q of the dosing flowmeter according to the deviation between the set value of the feedforward nitrate nitrogen online instrument and the real-time measured value of the feedforward nitrate nitrogen online instrument, and controlling the dosing pump frequency to reach the set value of the feedforward nitrate nitrogen online instrument through the flow q feedback; the method for determining the set value of the feedforward nitrate nitrogen online instrument comprises the following steps: according to the real-time measured value of the feedback nitrate nitrogen online instrument, the set value of the feed-forward nitrate nitrogen online instrument is calculated according to the following fitting formula: n is a radical of1 is provided with＝m×N2 fact+ n; wherein: n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; m, n: in order to obtain coefficients according to test tests, the value of m is generally-1 to-0.25, and the value of n is 2.5 to 10;
(B) carbon source feedforward compensation control: after the inflow Q of the pre-denitrification system for sewage treatment exceeds a preset amplitude, carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q. q.sq＝q×(QFruit of Chinese wolfberry/QIs provided with-1); wherein: q. q.sqThe feed-forward compensation amount of the carbon source is used; q is the amount of carbon source added for real-time main feedback; qIs provided withDesigning the water inlet flow; qFruit of Chinese wolfberryActual water inlet flow rate;
(C) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN discharge standard of the sewage treatment pre-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument according to the real-time measured value of the feedback nitrate nitrogen online instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isfThe feedback compensation amount of the carbon source is used; qFruit of Chinese wolfberryActual water inlet flow rate; n is a radical of2 factReal-time measurement value of the nitrate nitrogen on-line instrument is fed back; n is a radical of2 is provided withThe set value of the nitrate nitrogen on-line instrument is fed back; k0The value of the adding coefficient is determined by tests, wherein the adding coefficient is generally constant 4;
if the device is used for a post-denitrification system for sewage treatment, the control mode of the control device comprises the following steps (see figure 4):
(D) feed-forward feeding control: determining the feed-forward feeding carbon source amount according to a feed-forward feeding model formula, wherein the feed-forward feeding model formula is as follows: q ═ K0×QInto×(N1 fact-N1 is provided with) (ii) a Wherein, q: adding carbon source amount for feedforward; qInto: is the actual water inlet flow; n is a radical of1 fact: the method is a real-time measurement value of a feed-forward nitrate nitrogen online instrument; n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; k0The value of the adding coefficient is determined by tests, wherein the adding coefficient is generally constant 4; wherein N is1 is provided withSetting a specific numerical value according to the effluent TN discharge standard; e.g. TN giving off water 15, N1 is provided withCan be set to 13.5, i.e., N1 is provided withThe numerical value of (2) is slightly less than the TN water outlet value;
(E) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN (total nitrogen) discharge standard of the sewage treatment post-denitrification system, wherein the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set valueThe feedback of the carbon source is carried out after the set value of the nitrate nitrogen on-line instrument is fed back, and the feedback compensation quantity of the carbon source is determined according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isf: feeding back compensation amount for carbon source; qFruit of Chinese wolfberry: is the actual water inlet flow; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; n is a radical of2 is provided with: feeding back the set value of the nitrate nitrogen online instrument; k0The adding coefficient is generally constant 4; furthermore, the value of the addition coefficient can be determined through experiments.
The embodiment of the invention also provides a method for accurately adding the carbon source, which adopts the system for accurately adding the carbon source and comprises the following steps:
determining whether the accurate carbon source adding system is used for a pre-denitrification system for sewage treatment or a post-denitrification system for sewage treatment, and if the accurate carbon source adding system is used for the pre-denitrification system for sewage treatment, controlling the carbon source adding by a control device of the system according to the step 1; if the system is used for the post-denitrification system for sewage treatment, a control device of the system controls the addition of the carbon source according to the step 2;
step 1, the carbon source adding control for the pre-denitrification system for sewage treatment comprises the following steps:
(A) carbon source main feedback control: performing PID feedback control on the flow q of the dosing flowmeter according to the deviation between the set value of the feedforward nitrate nitrogen online instrument and the real-time measured value of the feedforward nitrate nitrogen online instrument, and controlling the dosing pump frequency to reach the set value of the feedforward nitrate nitrogen online instrument through the flow q feedback; the method for determining the set value of the feedforward nitrate nitrogen online instrument comprises the following steps: according to the real-time measured value of the feedback nitrate nitrogen online instrument, the set value of the feed-forward nitrate nitrogen online instrument is calculated according to the following fitting formula: n is a radical of1 is provided with＝m×N2 fact+ n; wherein: n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; m, n: for obtaining coefficients according to experimental tests, m is generally taken as a valueIs-1 to-0.25, and the value of n is 2.5 to 10;
(B) carbon source feedforward compensation control: after the inflow Q of the pre-denitrification system for sewage treatment exceeds a preset amplitude, carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q. q.sq＝q×(QFruit of Chinese wolfberry/QIs provided with-1); wherein: q. q.sqThe feed-forward compensation amount of the carbon source is used; q is the amount of carbon source added for real-time main feedback; qIs provided withDesigning the water inlet flow; qFruit of Chinese wolfberryActual water inlet flow rate;
(C) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN discharge standard of the sewage treatment pre-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument according to the real-time measured value of the feedback nitrate nitrogen online instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isfThe feedback compensation amount of the carbon source is used; qFruit of Chinese wolfberryActual water inlet flow rate; n is a radical of2 factReal-time measurement value of the nitrate nitrogen on-line instrument is fed back; n is a radical of2 is provided withThe set value of the nitrate nitrogen on-line instrument is fed back; k0The adding coefficient is generally constant 4;
step 2, the carbon source adding control for the sewage treatment post-denitrification system comprises the following steps:
(D) feed-forward feeding control: determining the feed-forward feeding carbon source amount according to a feed-forward feeding model formula, wherein the feed-forward feeding model formula is as follows: q ═ K0×QInto×(N1 fact-N1 is provided with) (ii) a Wherein, q: adding carbon source amount for feedforward; qInto: is the actual water inlet flow; n is a radical of1 fact: the method is a real-time measurement value of a feed-forward nitrate nitrogen online instrument; n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; k0The adding coefficient is generally constant 4;
(E) carbon source feedback compensation control:setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN (total nitrogen) discharge standard of the sewage treatment post-denitrification system, performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument, and determining the carbon source feedback compensation amount according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isf: feeding back compensation amount for carbon source; qFruit of Chinese wolfberry: is the actual water inlet flow; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; n is a radical of2 is provided with: feeding back the set value of the nitrate nitrogen online instrument; k0The addition coefficient is generally a constant of 4.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The embodiment of the invention provides a system and a method for adding a carbon source in a sewage treatment process, which are suitable for controlling the adding amount of the carbon source in a denitrification system of a municipal sewage treatment plant, can improve the adding control level of a medicament, and effectively reduce the cost of medicament consumption. Specifically, the frequency of the variable-frequency dosing pump is adjusted to realize different carbon source dosing amounts by arranging an online instrument to be matched with a control device, taking nitrate nitrogen as a control variable and adopting a nitrate nitrogen feedforward and feedback control mode. The method comprises the following steps: feed-forward compensation is implemented according to the fluctuation condition of the inflow water flow, and feedback compensation is performed aiming at the standard exceeding of the TN of the outflow water; by introducing feedforward and feedback control of nitrate nitrogen and feedforward and feedback compensation, the problem that single nitrate nitrogen feedback control is difficult to deal with water quality and water quantity fluctuation is solved, accurate carbon source addition and stable control are realized, the process reaches the standard, and the efficient and stable operation of a sewage treatment system is realized.
The system and the method can realize stable carbon source adding in a sewage treatment denitrification process (such as an anoxic tank, a denitrification filter tank and the like), feed back and adjust the frequency of a adding pump in real time according to the concentration change of nitrate nitrogen in a reaction tank, feed forward and adjust the adding amount of the carbon source according to the fluctuation condition of water quantity, compensate the amount of the carbon source according to the over-high condition of the TN of effluent, and respectively explain the control modes of the anoxic tank and the denitrification filter tank as reaction zones of preposed denitrification and postpositional denitrification, wherein the control modes are as follows:
the control mode used in the pre-denitrification system is (I) as follows (see figures 1 and 3):
(1) on-line nitrate nitrogen instrument 1# NO is arranged at the tail end of the anoxic pond31# NO3Namely a feedforward nitrate nitrogen online instrument, an electromagnetic flowmeter Q is arranged on a water inlet pipe to be used as a water inlet flowmeter, and an online nitrate nitrogen instrument 2# NO is arranged at the tail end of an aerobic pool3The 2# NO3Namely, the method is a feedback nitrate nitrogen online instrument, a variable frequency dosing pump and a dosing flowmeter q are arranged on a carbon source dosing pipeline for dosing a carbon source into a reaction zone, the variable frequency dosing pump adopts a dosing pump with a variable frequency motor, and the variable frequency motor is controlled by a frequency converter VF.
(2) Carbon source main feedback control: according to No. 1 NO3Real-time measured value of (1) and the NO3The flow q of the PID feedback control dosing flowmeter is carried out according to the deviation of the set value (the flow q is the real-time feedback dosing carbon source amount), and the frequency of the variable-frequency dosing pump is controlled according to the flow q feedback to meet the required 1# NO3The set value of (2);
wherein, 1# NO3The set value of the aerobic pool is determined according to the TN discharge standard of the effluent at the tail end of the aerobic pool and 2# NO3Is set according to No. 2 NO3The real-time measurement value is calculated according to the following fitting formula:
N1 is provided with＝m×N2 fact+n；
Wherein: n is a radical of1 is provided with: is No. 13The set value of (2);
N2 fact: is No. 23Real-time measured value of
m, n: in order to obtain coefficients according to test tests, the value of m is generally-1 to-0.25, and the value of n is 2.5 to 10;
due to No. 13Is according to No. 2 NO3The real-time measured value is determined according to the TN discharge standard of the effluent at the tail end of the aerobic tank, so that the No. 1 NO3Can be based on NO 2#3The real-time measured value is adjusted at regular time), when in operation, 2# NO is selected in a certain interval range according to TN discharge standard of effluent at the tail end of the aerobic tank3After one cycle of operation, the control device is based on No. 23The real-time measured value is calculated according to the fitting formula to obtain No. 1 NO31# NO during subsequent operation3Is based on NO 2#3The real-time measurement value of (2) is dynamically adjusted.
(3) Carbon source feedforward compensation control: in the operation process, if the water inlet flow Q of the anoxic tank exceeds a preset amplitude (the preset amplitude can be set according to needs, such as 15% or other proportions), carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q. q.sq＝q×(QFruit of Chinese wolfberry/QIs provided with-1)；
Wherein: q. q.sq: feeding forward compensation amount for carbon source;
q; feeding the amount of the carbon source for real-time feedback;
Qis provided with: designing the water inlet flow;
Qfruit of Chinese wolfberry: is the actual inlet water flow.
(4) Carbon source feedback compensation control: setting No. 2 NO according to TN discharge standard of the effluent at the tail end of the aerobic tank3Is a certain value, if 2# NO3Is more than the 2# NO3Performing carbon source feedback compensation after the set value is obtained, wherein the carbon source feedback compensation amount is as follows: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with)；
Wherein q isf: feeding back compensation amount for carbon source;
Qfruit of Chinese wolfberry: is the actual water inlet flow;
N2 fact: is No. 23Real-time measurement of values;
N2 is provided with: is No. 23The set value of (2);
K0: for the addition factor, a constant of 4 is generally taken and can also be determined experimentally.
(II) the control mode for the post denitrification system is as follows (see figures 2 and 4):
(1) an online nitrate nitrogen instrument 1# NO is arranged at the front end of the denitrification filter31# NO3Namely a feedforward nitrate nitrogen online instrument, an electromagnetic flow meter Q is arranged on a water inlet pipe to be used as a water inlet flow meter, and an online nitrate nitrogen instrument 2# NO is arranged at the tail end of a denitrification filter tank3The 2# NO3Namely, the nitrate nitrogen feedback online instrument is characterized in that a variable frequency dosing pump and a dosing flowmeter q are arranged on a carbon source feeding pipeline for feeding a carbon source into a denitrification filter tank of a reaction zone, the variable frequency dosing pump adopts a dosing pump with a variable frequency motor, and the variable frequency motor is controlled by a frequency converter VF.
(2) Feed-forward feeding control: setting No. 1 NO according to the effluent discharge standard of the denitrification filter3According to the inflow rate Q and No. 1 NO3The set value of (2) establishes a feedforward adding model, and the formula of the feedforward adding model is as follows: q ═ K0×QInto×(N1 fact-N1 is provided with)；
Wherein, q: adding carbon source amount for feedforward;
Qinto: is the actual water inlet flow;
N1 fact: is No. 13Real-time measurement of values;
N1 is provided with: is No. 13The set value of (2);
K0: the constant of 4 is generally taken as the adding coefficient, and can also be determined according to tests;
and the control device adjusts the frequency of the variable-frequency dosing pump according to the feed-forward dosing flow q to realize the required carbon source dosing flow.
(3) Carbon source feedback compensation control: setting No. 2 NO according to TN discharge standard of tail end effluent of the denitrification filter3Is a certain value, if 2# NO3Is more than the 2# NO3The carbon source feedback compensation is carried out after the set value, and the carbon source feedback compensation amount is determined according to the following companies: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with)；
Wherein q isf: feeding back compensation amount for carbon source;
Qfruit of Chinese wolfberry: is the actual water inlet flow;
N2 fact: is No. 23Real-time measurement of values;
N2 is provided with: is No. 23The set value of (2).
K0: for the addition factor, generally 4 is taken, as determined by tests.
The invention has at least the following advantages: NO based denitrification system3The carbon source is controlled to be added by feedforward and feedback for controlling variable, and the method is widely suitable for a town sewage treatment denitrification system unit;
the control mode is based on process calculation, and has wide application in biochemical treatment by adopting an external carbon source adding system;
with NO3The feed-forward and feedback are combined to control the carbon source adding flow of the variable-frequency dosing pump, feed-forward flow compensation adding is assisted, and the problem of delay adjustment of the system caused by water quantity and water quality fluctuation is solved;
the nitrate nitrogen in the aerobic pool is relatively stable, the accuracy of installing a nitrate nitrogen instrument at the tail end of the aerobic pool is relatively high, the influence of water quality fluctuation and measurement errors at the front end of the anoxic pool for installing the instrument are solved, and the disturbance of large fluctuation and large delay to a system is solved;
nitrate nitrogen measured at the tail end of the aerobic tank directly reflects the TN value of effluent, the feedback compensation real-time performance is high, and the influence of system delay on stable standard reaching of TN is solved.
The system is applied to the project with AAO as the main process of 2 ten thousand tons per day, the dosage of carbon source adding agents is reduced by more than 15%, and the operation intensity can be greatly reduced.
Examples
The embodiment provides a system for accurately adding a carbon source, and the method for accurately adding the carbon source of the system comprises the following steps:
the process running condition is that a certain urban sewage treatment plant is scaled to 2 million tons per day, the AAO process is adopted as the main process, the effluent is required to reach the 4-class discharge standard on the earth surface, the ammonia nitrogen effluent is 1mg/L, and the TN effluent is 10 mg/L; the biochemical pool is divided into 2 series, each series is an anaerobic pool, an anoxic pool and an aerobic pool;
the accurate carbon source adding system (see fig. 1) used in this example includes: the control device 1 consists of an automatic control cabinet 10 and an industrial personal computer 15, wherein an electric cabinet equipment switch 11, a contactor 12, a wiring terminal 13 and the like are arranged in the automatic control cabinet 10, and a frequency converter 14 for controlling a variable frequency motor of a dosing pump, the industrial personal computer 15 and the like can also be arranged in the automatic control cabinet 10; a feed-forward nitrate nitrogen online instrument 31 is arranged at the tail end of the anoxic tank, a feedback nitrate nitrogen online instrument 32 is arranged at the tail end of the aerobic tank, and an online electromagnetic flowmeter serving as a water inlet flowmeter 41 is arranged on the water inlet pipe; a variable frequency dosing pump 2 driven by a variable frequency motor is arranged in the dosing room;
the equipment and the instrument are connected with the automatic control cabinet through a power line and a signal line and are controlled through a PLC; the industrial personal computer is in communication connection with the automatic control cabinet;
after the equipment and the instrument are installed, communication connection is established, and a control program is led into the PLC module;
carbon source addition real-time control step (see fig. 3):
setting the set value of the feedback nitrate nitrogen online instrument 32 to be 5-9mg/L in different intervals according to the TN effluent water quality standard being lower than 10mg/L, setting different intervals according to the feedback nitrate nitrogen online instrument 32 and controlling the feedforward nitrate nitrogen online instrument 31, wherein the debugging values m and n are respectively-0.5 and 6, and the numerical values of the feedback nitrate nitrogen online instrument 32 in the control interval are 5mg/L, 5.5mg/L, 6mg/L, 6.5mg/L, 7mg/L, 7.5mg/L, 8mg/L, 8.5mg/L and 9mg/L, and the adjustment values of the feedforward nitrate nitrogen online instrument 31 are 3.5mg/L, 3.25mg/L, 3mg/L, 2.75mg/L, 2.5mg/L, 2.25mg/L, 2mg/L, 1.75mg/L, 2.5mg/L, 1.5mg/L, the control device selects the set value of the feedforward nitrate nitrogen online instrument 31 according to the adjustment value; the flow q of the dosing flowmeter is controlled in a PID feedback mode according to the deviation between the set value of the feedforward nitrate nitrogen online instrument 31 and the real-time measured value of the feedforward nitrate nitrogen online instrument, and the frequency of the variable-frequency dosing pump is controlled in a feedback mode according to the flow q so that the feedforward nitrate nitrogen online instrument 31 reaches the required set value;
the inlet water volume (single sequence) of the inlet water flow meter 41 lasts for 30min and exceeds 480m3H or less than 354m3Starting carbon source feedforward compensation at the time of/h, wherein the carbon source feedforward compensation amount is qq＝q×(QFruit of Chinese wolfberry417-1), controlling a variable-frequency dosing pump to dose the carbon source according to the feed-forward compensation quantity of the carbon source;
setting the safety value of the nitrate nitrogen feedback online instrument 32 to be 8.5mg/L, starting carbon source feedback compensation when the safety value exceeds the safety value, wherein the carbon source feedback compensation amount is qf＝4×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) Controlling a variable-frequency dosing pump to dose the carbon source according to the feedback compensation quantity of the carbon source;
during the operation of the system, the feedback nitrate nitrogen online instrument 32 basically keeps the upper and lower amplitude of 8-9 mg/L, and the effluent TN test is lower than 10mg/L, so that the stability is guaranteed to reach the standard. After the water quantity impact fluctuation, the system can quickly respond to the carbon source feedback compensation, when the abnormal fault of the main instrument numerical value cannot be automatically repaired, the system is switched to a constant medicament adding mode to add the carbon source, and the system is prevented from causing error signal control. After 5 months of operation, the adding system stably controls the adding of the carbon source, compared with the method that the adding amount of the carbon source is saved by 16.2 percent at the same time, the reasonable control of the nitrate nitrogen enables the total nitrogen yielding water to reach the standard obviously and can be basically stabilized within the discharge standard.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention 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 invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The accurate adding system of carbon source is characterized by comprising:
the system comprises an online water inlet flowmeter, a control device, a feedforward nitrate nitrogen online instrument, a feedback nitrate nitrogen online instrument, a variable-frequency dosing pump and a dosing flowmeter; wherein,
the water inlet online flowmeter is arranged on a water inlet pipe of the pre-denitrification system for sewage treatment or the post-denitrification system for sewage treatment, and the feedback end of the water inlet online flowmeter is electrically connected with the control device;
the feed-forward nitrate nitrogen online instrument is arranged at the front end in an anoxic tank of the sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feed-forward nitrate nitrogen online instrument is electrically connected with the control device;
the nitrate nitrogen feedback online instrument is arranged at the rear end in an aerobic tank of the pre-denitrification system for sewage treatment or a denitrification filter tank of the post-denitrification system for sewage treatment, and the feedback end of the nitrate nitrogen feedback online instrument is electrically connected with the control device;
the variable-frequency dosing pump and the dosing flowmeter are sequentially arranged on a carbon source dosing pipeline of an anoxic tank of the pre-denitrification system for sewage treatment or a denitrification filter tank of the post-denitrification system for sewage treatment, the variable-frequency control end of the variable-frequency dosing pump is electrically connected with the control device, and the feedback end of the dosing flowmeter is electrically connected with the control device;
the control device can adjust the frequency of the variable-frequency dosing pump and adjust the carbon source dosing amount of the sewage treatment system according to the water inflow signal fed back by the water inflow online flowmeter, the nitrate nitrogen feed-forward signal fed back by the feed-forward nitrate nitrogen online instrument and the nitrate nitrogen feedback signal fed back by the feed-back nitrate nitrogen online instrument.
2. The accurate carbon source adding system of claim 1, wherein the control device comprises an industrial personal computer and an automatic control cabinet which are in communication connection;
the automatic control cabinet is respectively and electrically connected with the variable-frequency dosing pump, the water inlet online flowmeter, the first nitrate nitrogen online instrument and the second nitrate nitrogen online instrument.
3. The accurate carbon source adding system of claim 1 or 2, wherein the online water inlet flow meter is an electromagnetic flow meter.
4. The accurate carbon source dosing system as claimed in claim 1 or 2, wherein the control device is capable of adjusting the frequency of the variable frequency dosing pump to adjust the carbon source dosing amount to the sewage treatment system according to the water inflow signal fed back by the online water inflow meter, the nitrate nitrogen feed-forward signal fed back by the nitrate nitrogen feed-forward online meter, and the nitrate nitrogen feedback signal fed back by the nitrate nitrogen feed-forward online meter,
if the control device is used for the pre-denitrification system for sewage treatment, the control mode of the control device comprises the following steps:
(A) carbon source main feedback control: performing PID feedback control on the flow q of the dosing flowmeter according to the deviation between the set value of the feedforward nitrate nitrogen online instrument and the real-time measured value of the feedforward nitrate nitrogen online instrument, and controlling the dosing pump frequency to reach the set value of the feedforward nitrate nitrogen online instrument through the flow q feedback; the method for determining the set value of the feedforward nitrate nitrogen online instrument comprises the following steps: according to the real-time measured value of the feedback nitrate nitrogen online instrument, the set value of the feedforward nitrate nitrogen online instrument is calculated according to the following fitting formula: n is a radical of1 is provided with＝m×N2 fact+ n; wherein: n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; m, n: according to the coefficient obtained by test, the value of m is-1 to-0.25, and the value of n is 2.5 to 10;
(B) carbon source feedforward compensation control: after the inflow Q of the pre-denitrification system for sewage treatment exceeds a preset amplitude, carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q. q.sq＝q×(QFruit of Chinese wolfberry/QIs provided with-1); wherein: q. q.sqThe feed-forward compensation amount of the carbon source is used; q is the amount of carbon source added for real-time main feedback; qIs provided withDesigning the water inlet flow; qFruit of Chinese wolfberryActual water inlet flow rate;
(C) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN (total nitrogen) discharge standard of the sewage treatment pre-denitrification system, and when the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the feedback nitrate nitrogen online instrument according to the real-time measured value of the feedback nitrate nitrogen online instrumentAnd (3) performing carbon source feedback compensation after the set value of the instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isfThe feedback compensation amount of the carbon source is used; qFruit of Chinese wolfberryActual water inlet flow rate; n is a radical of2 factReal-time measurement value of the nitrate nitrogen on-line instrument is fed back; n is a radical of2 is provided withThe set value of the nitrate nitrogen on-line instrument is fed back; k0The adding coefficient is constant 4;
if the device is used for a post-denitrification system for sewage treatment, the control mode of the control device comprises the following steps:
(D) feed-forward feeding control: determining the feed-forward feeding carbon source amount according to a feed-forward feeding model formula, wherein the feed-forward feeding model formula is as follows: q ═ K0×QInto×(N1 fact-N1 is provided with) (ii) a Wherein, q: adding carbon source amount for feedforward; qInto: is the actual water inlet flow; n is a radical of1 fact: the method is a real-time measurement value of a feed-forward nitrate nitrogen online instrument; n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; k0The adding coefficient is constant 4;
(E) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN (total nitrogen) discharge standard of the sewage treatment post-denitrification system, performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument, and determining the carbon source feedback compensation amount according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isf: feeding back compensation amount for carbon source; qFruit of Chinese wolfberry: is the actual water inlet flow; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; n is a radical of2 is provided with: feeding back the set value of the nitrate nitrogen online instrument; k0The value of the addition coefficient is constant 4.
5. A method for accurately adding a carbon source, which is characterized in that the system for accurately adding the carbon source as claimed in any one of claims 1 to 3 is adopted, and comprises the following steps:
determining whether the accurate carbon source adding system is used for a pre-denitrification system for sewage treatment or a post-denitrification system for sewage treatment, and if the accurate carbon source adding system is used for the pre-denitrification system for sewage treatment, controlling the carbon source adding by a control device of the system according to the step 1; if the system is used for the post-denitrification system for sewage treatment, a control device of the system controls the addition of the carbon source according to the step 2;
step 1, the carbon source adding control for the pre-denitrification system for sewage treatment comprises the following steps:
(A) carbon source main feedback control: performing PID feedback control on the flow q of the dosing flowmeter according to the deviation between the set value of the feedforward nitrate nitrogen online instrument and the real-time measured value of the feedforward nitrate nitrogen online instrument, and controlling the dosing pump frequency to reach the set value of the feedforward nitrate nitrogen online instrument through the flow q feedback; the method for determining the set value of the feedforward nitrate nitrogen online instrument comprises the following steps: according to the real-time measured value of the feedback nitrate nitrogen online instrument, the set value of the feedforward nitrate nitrogen online instrument is calculated according to the following fitting formula: n is a radical of1 is provided with＝m×N2 fact+ n; wherein: n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; m, n: is a coefficient obtained by testing according to a test;
(B) carbon source feedforward compensation control: after the inflow Q of the pre-denitrification system for sewage treatment exceeds a preset amplitude, carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q. q.sq＝q×(QFruit of Chinese wolfberry/QIs provided with-1); wherein: q. q.sqThe feed-forward compensation amount of the carbon source is used; q is the amount of carbon source added for real-time main feedback; qIs provided withDesigning the water inlet flow; qFruit of Chinese wolfberryActual water inlet flow rate;
(C) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN (total nitrogen) discharge standard of the sewage treatment pre-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument according to the real-time measured value of the feedback nitrate nitrogen online instrument, wherein the carbon source feedback compensation amount is determined according to the following formulaDetermining: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isfThe feedback compensation amount of the carbon source is used; qFruit of Chinese wolfberryActual water inlet flow rate; n is a radical of2 factReal-time measurement value of the nitrate nitrogen on-line instrument is fed back; n is a radical of2 is provided withThe set value of the nitrate nitrogen on-line instrument is fed back; k0The adding coefficient is constant 4;
step 2, the carbon source adding control for the sewage treatment post-denitrification system comprises the following steps:
(D) feed-forward feeding control: determining the feed-forward feeding carbon source amount according to a feed-forward feeding model formula, wherein the feed-forward feeding model formula is as follows: q ═ K0×QInto×(N1 fact-N1 is provided with) (ii) a Wherein, q: adding carbon source amount for feedforward; qInto: is the actual water inlet flow; n is a radical of1 fact: the method is a real-time measurement value of a feed-forward nitrate nitrogen online instrument; n is a radical of1 is provided with: is a set value of a feed-forward nitrate nitrogen online instrument; k0The adding coefficient is constant 4;
(E) carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen online instrument according to the effluent TN (total nitrogen) discharge standard of the sewage treatment post-denitrification system, performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen online instrument exceeds the set value of the feedback nitrate nitrogen online instrument, and determining the carbon source feedback compensation amount according to the following formula: q. q.sf＝K0×QFruit of Chinese wolfberry×(N2 fact-N2 is provided with) (ii) a Wherein q isf: feeding back compensation amount for carbon source; qFruit of Chinese wolfberry: is the actual water inlet flow; n is a radical of2 fact: the method is a real-time measurement value of the nitrate nitrogen on-line instrument; n is a radical of2 is provided with: feeding back the set value of the nitrate nitrogen online instrument; k0The value of the addition coefficient is constant 4.
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| CN111072140A (en) * | 2019-12-31 | 2020-04-28 | 上海昊沧系统控制技术有限责任公司 | Carbon source adding amount on-line calculation method based on denitrification process of anoxic tank |
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| CN111960533A (en) * | 2020-06-02 | 2020-11-20 | 西安热工研究院有限公司 | Novel carbon source adding optimization control device and method |
| CN111943354A (en) * | 2020-07-16 | 2020-11-17 | 深圳市清泉水业股份有限公司 | Carbon source adding method and system for denitrification filter tank system |
| CN111943354B (en) * | 2020-07-16 | 2021-05-28 | 深圳市清泉水业股份有限公司 | Carbon source adding method and system for denitrification filter tank system |
| CN112978919A (en) * | 2021-01-29 | 2021-06-18 | 上海西派埃智能化系统有限公司 | Carbon source adding system and method for sewage treatment plant |
| CN113044973A (en) * | 2021-03-18 | 2021-06-29 | 苏州美淼环保科技有限公司 | Sewage treatment control system and effluent TN control method |
| CN113277685A (en) * | 2021-06-22 | 2021-08-20 | 哈尔滨工业大学（深圳） | AAO technology carbon source adding control system |
| CN114229990A (en) * | 2021-12-28 | 2022-03-25 | 北京首创生态环保集团股份有限公司 | Ozone adding control system and method for ozone catalytic oxidation process |
| CN116022924A (en) * | 2023-01-16 | 2023-04-28 | 中原环保股份有限公司 | In-situ accurate biological denitrification sewage treatment control method |
| CN116022924B (en) * | 2023-01-16 | 2023-09-12 | 中原环保股份有限公司 | In-situ accurate biological denitrification sewage treatment control method |
| CN117985847A (en) * | 2023-06-21 | 2024-05-07 | 浙江数翰科技有限公司 | Intelligent carbon source adding method and system |
| CN118311877A (en) * | 2024-06-05 | 2024-07-09 | 上海勘测设计研究院有限公司 | Dosing control method, storage medium and control device for sewage treatment |
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