CN110127863B - Accurate carbon source adding system and method - Google Patents
Accurate carbon source adding system and method Download PDFInfo
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- CN110127863B CN110127863B CN201910555235.XA CN201910555235A CN110127863B CN 110127863 B CN110127863 B CN 110127863B CN 201910555235 A CN201910555235 A CN 201910555235A CN 110127863 B CN110127863 B CN 110127863B
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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 79
- 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 182
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000010865 sewage Substances 0.000 claims abstract description 84
- 238000005259 measurement Methods 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 16
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000003814 drug Substances 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect 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
- 238000010276 construction Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000011112 process operation 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
- 230000001360 synchronised effect Effects 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 carbon source accurate adding system and a method, comprising the following steps: the water inlet on-line flowmeter is electrically connected with the control device; the feedforward nitrate nitrogen on-line instrument is electrically connected with the control device; the feedback nitrate nitrogen on-line instrument is electrically connected with the control device; the variable-frequency dosing pump and the dosing flowmeter are electrically connected with the control device; the control device can adjust the frequency of the variable-frequency dosing pump according to the water inflow signal fed back by the water inflow online flowmeter and the nitrate nitrogen feedforward signal fed back by the feedforward nitrate nitrogen online instrument and according to the nitrate nitrogen feedback signal fed back by the feedback nitrate nitrogen online instrument and adjust the carbon source dosing amount of the sewage treatment system according to the carbon source dosing feedback signal of the dosing flowmeter. The system and method can be used for removing NO in the system 3 The feed-forward and feedback control of carbon source addition is adopted to control the variables, and the method has the advantages of stable operation and reduced carbon source consumption.
Description
Technical Field
The invention relates to the field of carbon source adding in the sewage treatment process, in particular to a carbon source accurate adding system and a carbon source accurate adding method.
Background
At present, due to the rapid development of society, the increasing of the urban construction force, the operation of urban sewage treatment plants enters into a high-efficiency operation period, the increasing of the environmental pressure, the increasing of the emission standard and the increasing of the environmental protection law enforcement force along with the increasing of the economic level of each place, particularly the emission requirements of TN and TP, and the water eutrophication is caused by the overhigh requirement. The standard discharge pressure of the sewage treatment plant is increased, the efficiency of enterprises is increased, the energy conservation and consumption reduction are realized, and the social energy conservation and emission reduction targets are 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 ammonia nitrogen is subjected to nitrification to generate denitrification to generate N in the process section 2 The denitrification purpose is achieved. The carbon source in the sewage can generally meet the denitrification requirement, but the high emission standard requirement is met, the mode of adding the external carbon source is generally needed, the adding mode is mainly constant adding of acetic acid or sodium acetate, manual adjustment is carried out according to the treatment effect, and the conditions of untimely TN exceeding standard, overlarge adding amount and the like due to fluctuation adjustment of water quality and water quantity often occur.
At present, aiming at the research of medicament dosing control, most of feedback control based on nitrate nitrogen is regulated, but single feedback control is greatly influenced by water quality and water quantity, a control system often has large delay, and the hysteresis influence is large, so that the regulation effect of the system is poor; with the development of an automatic control process control system, feedforward control is added to solve the problems of water quantity, water quality fluctuation and the like, but chemical demand (COD) and ammonia Nitrogen (NH) of the inflow water also exist under the condition of water quality fluctuation 3 ) The instrument can not respond in real time, the fault rate of the instrument is higher, the reliability of the instrument is affected to a certain extent, and the control system has deviation.
Therefore, under the promotion of energy conservation and consumption reduction of sewage treatment and standard technological standards, how to accurately control carbon source addition so as to facilitate the efficient and stable operation of a sewage treatment plant is a problem to be solved.
Disclosure of Invention
Based on the problems existing in the prior art, the invention aims to provide a carbon source accurate adding system and method, which can solve the problems that the control accuracy of the external carbon source is poor and the high-efficiency stable operation of a sewage treatment plant cannot be ensured in the existing sewage treatment.
The invention aims at realizing the following technical scheme:
the embodiment of the invention provides a carbon source accurate adding system, which comprises the following components:
the device comprises a water inlet on-line flowmeter, a control device, a feedforward nitrate nitrogen on-line instrument, a feedback nitrate nitrogen on-line instrument, a variable-frequency dosing pump and a dosing flowmeter; wherein, the liquid crystal display device comprises a liquid crystal display device,
the water inlet online flowmeter is arranged on a water inlet pipe of the sewage treatment pre-denitrification system or the sewage treatment post-denitrification system, and the feedback end of the water inlet online flowmeter is electrically connected with the control device;
the feedforward nitrate nitrogen on-line instrument is arranged at the front end in an anoxic tank of the sewage treatment pre-denitrification system or in a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feedforward nitrate nitrogen on-line instrument is electrically connected with the control device;
the feedback nitrate nitrogen on-line instrument is arranged at the rear end in the aerobic tank of the sewage treatment pre-denitrification system or in the denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feedback nitrate nitrogen on-line 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 sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, a variable-frequency control end of the variable-frequency dosing pump is electrically connected with the control device, and a 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 according to the water inflow signal fed back by the water inflow online flowmeter and the nitrate nitrogen feedforward signal fed back by the feedforward nitrate nitrogen online meter and the nitrate nitrogen feedback signal fed back by the feedback nitrate nitrogen online meter, and adjust the carbon source dosing amount of the sewage treatment system according to the carbon source dosing feedback signal of the dosing flowmeter.
The embodiment of the invention also provides a carbon source accurate adding method, which adopts the carbon source accurate adding system of the invention and comprises the following steps:
determining whether the accurate carbon source adding system is used for a sewage treatment pre-denitrification system or a sewage treatment post-denitrification system, and if the accurate carbon source adding system is used for the sewage treatment pre-denitrification system, controlling the carbon source adding by a control device of the system according to the step 1; if the device is used for a sewage treatment post-denitrification system, the control device of the system performs carbon source adding control according to the step 2;
step 1, carbon source adding control for a sewage treatment pre-denitrification system 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 on-line instrument and the real-time measured value of the feedforward nitrate nitrogen on-line instrument, and performing feedback control on the dosing pump frequency to reach the required set value of the feedforward nitrate nitrogen on-line instrument through the flow q; the method for determining the set value of the feedforward nitrate nitrogen on-line instrument is as follows: according to the real-time measured value of the feedback nitrate nitrogen online instrument, calculating the set value of the feedforward nitrate nitrogen online instrument according to the following fitting formula: n (N) 1 is provided with ＝m×N 2 reality +n; wherein: n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; m, n: in order to test the obtained coefficient according to the test, 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 water inflow Q of the sewage treatment pre-denitrification system exceeds a preset amplitude, performing carbon source feedforward compensation, wherein the carbon source feedforward compensation amount is determined according to the following formula: q q ＝q×(Q Real world /Q Is provided with -1); wherein: q q The feedforward compensation quantity of the carbon source is adopted; q, adding carbon source quantity for real-time main feedback; q (Q) Is provided with The method comprises the steps of designing water inflow; q (Q) Real world The actual inflow flow is shown;
(C) Carbon source feedback compensation control: according to the sewage treatment front-end strippingSetting a set value of the feedback nitrate nitrogen on-line instrument according to a discharge standard of effluent TN of the nitrogen system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument according to the real-time measured value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation quantity is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f The carbon source feedback compensation quantity; q (Q) Real world The actual inflow flow is shown; n (N) 2 reality The method is to feed back the real-time measured value of the nitrate nitrogen on-line instrument; n (N) 2 is provided with The method is to feed back the setting value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is constant 4;
step 2, carbon source adding control for a sewage treatment post-denitrification system comprises the following steps:
(D) Feedforward addition control: determining the feed-forward addition carbon source amount according to a feed-forward addition model formula, wherein the feed-forward addition model formula is as follows: q=k 0 ×Q Feeding in ×(N 1 practice of -N 1 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q: adding a carbon source amount for feedforward; q (Q) Feeding in : is the actual water inflow; n (N) 1 practice of : real-time measurement values of the feedforward nitrate nitrogen online instrument; n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; k (K) 0 The value of the addition coefficient is constant 4;
(E) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission standard of the sewage treatment post-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation quantity is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f : the compensation quantity is fed back for the carbon source; q (Q) Real world : is the actual water inflow; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; n (N) 2 is provided with : the method is used for feeding back a set value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is constant 4.
As can be seen from the technical scheme provided by the invention, the carbon source accurate adding system and method provided by the embodiment of the invention have the beneficial effects that:
NO based on denitrification system can be realized through the arrangement of the organically connected water inlet online flowmeter, the control device, the feedforward nitrate nitrogen online meter, the feedback nitrate nitrogen online meter, the variable-frequency dosing pump and the dosing flowmeter 3 For controlling variables, the feed-forward and feedback control is adopted to feed-in the carbon source, so that the problem of delay adjustment of the denitrification system caused by fluctuation of water quantity and water quality is solved well, the disturbance of the system caused by large fluctuation and the influence of the system delay on TN stability and standard reaching are greatly solved, and the system and the method can reduce the dosage of the carbon source and the operation intensity.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a carbon source accurate adding system for a sewage treatment pre-denitrification system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a carbon source accurate adding system for a post-denitrification system for sewage treatment according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for accurately adding carbon source using the system for accurately adding carbon source shown in FIG. 1;
FIG. 4 is a flowchart of a method for accurately adding carbon source using the system for accurately adding carbon source shown in FIG. 2;
the labels in fig. 1, 2 are: 1-a control device; 10-an automatic control cabinet; 11-electrical cabinet equipment switches; 12-contactor; 13-connecting terminals; 14-a frequency converter; 15-an industrial personal computer; 2-a variable-frequency dosing pump; 21-a dosing flowmeter; 3-a water outlet pipe; 31-feedforward nitrate nitrogen on-line instrument; 32-feeding back nitrate nitrogen on-line instrument; 4-a water inlet pipe; 41-an in-line flow meter; 5-an anoxic tank; 6-an aerobic tank; 7-denitrification filter.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention in conjunction with the specific contents of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. What is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art.
As shown in fig. 1 or fig. 2, the embodiment of the invention provides a carbon source accurate adding system, which is suitable for controlling the adding amount of carbon sources in a denitrification system of a municipal sewage treatment plant, can improve the adding control level of a medicament, and effectively reduces the medicament consumption cost, and comprises:
the device comprises a water inlet on-line flowmeter, a control device, a feedforward nitrate nitrogen on-line instrument, a feedback nitrate nitrogen on-line instrument, a variable-frequency dosing pump and a dosing flowmeter; wherein, the liquid crystal display device comprises a liquid crystal display device,
the water inlet online flowmeter is arranged on a water inlet pipe of a sewage treatment pre-denitrification system (such as an AAO system) or a sewage treatment post-denitrification system (such as a denitrification filter system), and the feedback end of the water inlet online flowmeter is electrically connected with the control device;
the feedforward nitrate nitrogen on-line instrument is arranged at the front end in an anoxic tank of the sewage treatment pre-denitrification system or in a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feedforward nitrate nitrogen on-line instrument is electrically connected with the control device;
the feedback nitrate nitrogen on-line instrument is arranged at the tail end in an aerobic tank of the sewage treatment pre-denitrification system or in a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feedback nitrate nitrogen on-line 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 sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, a variable-frequency control end of the variable-frequency dosing pump is electrically connected with the control device, and a 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 according to the water inflow signal fed back by the water inflow online flowmeter and the nitrate nitrogen feedforward signal fed back by the feedforward nitrate nitrogen online meter and the nitrate nitrogen feedback signal fed back by the feedback nitrate nitrogen online meter, and adjust the carbon source dosing amount of the sewage treatment system according to the carbon source dosing feedback signal of the dosing flowmeter.
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 electrically connected with the variable-frequency dosing pump, the water inlet on-line flowmeter, the first nitrate nitrogen on-line instrument and the second nitrate nitrogen on-line instrument respectively.
In the system, the water inlet on-line flowmeter adopts an electromagnetic flowmeter.
In the system, the control device can adjust the frequency of the variable-frequency dosing pump according to the water inflow signal fed back by the water inflow online flowmeter, the nitrate nitrogen feedforward signal fed back by the feedforward nitrate nitrogen online instrument and the nitrate nitrogen feedback signal fed back by the feedback nitrate nitrogen online instrument to adjust the dosing amount of the carbon source of the sewage treatment system,
if the control device is used for the sewage treatment pre-denitrification system, the control mode of the control device comprises (see fig. 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 on-line instrument and the real-time measured value of the feedforward nitrate nitrogen on-line instrument, and performing feedback control on the dosing pump frequency to reach the required set value of the feedforward nitrate nitrogen on-line instrument through the flow q; the method for determining the set value of the feedforward nitrate nitrogen on-line instrument is as follows: according to the real-time measured value of the feedback nitrate nitrogen online instrument, calculating the set value of the feedforward nitrate nitrogen online instrument according to the following fitting formula: n (N) 1 is provided with ＝m×N 2 reality +n; wherein: n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; m, n: in order to test the obtained coefficient according to the test, 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 water inflow Q of the sewage treatment pre-denitrification system exceeds a preset amplitude, performing carbon source feedforward compensation, wherein the carbon source feedforward compensation amount is determined according to the following formula: q q ＝q×(Q Real world /Q Is provided with -1); wherein: q q The feedforward compensation quantity of the carbon source is adopted; q, adding carbon source quantity for real-time main feedback; q (Q) Is provided with The method comprises the steps of designing water inflow; q (Q) Real world The actual inflow flow is shown;
(C) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission 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 on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument according to the real-time measured value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f The carbon source feedback compensation quantity; q (Q) Real world The actual inflow flow is shown; n (N) 2 reality The method is to feed back the real-time measured value of the nitrate nitrogen on-line instrument; n (N) 2 is provided with The method is to feed back the setting value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is generally constant 4 and can be determined through experiments;
if the control device is used for the sewage treatment post-denitrification system, the control mode of the control device comprises (see fig. 4):
(D) Feedforward addition control: determining the feed-forward addition carbon source amount according to a feed-forward addition model formula, wherein the feed-forward addition model formula is as follows: q=k 0 ×Q Feeding in ×(N 1 practice of -N 1 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q: adding a carbon source amount for feedforward; q (Q) Feeding in : is the actual water inflow; n (N) 1 practice of : for feed-forward nitrate nitrogen in-line metersMeasuring in real time; n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; k (K) 0 The value of the addition coefficient is generally constant 4 and can be determined through experiments; wherein N is 1 is provided with Setting a specific numerical value according to the discharge standard of the effluent TN; for TN effluent 15, N 1 is provided with Can be set to 13.5, N 1 is provided with The numerical value of (2) is slightly smaller than the TN water outlet value;
(E) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission standard of the sewage treatment post-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation quantity is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f : the compensation quantity is fed back for the carbon source; q (Q) Real world : is the actual water inflow; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; n (N) 2 is provided with : the method is used for feeding back a set value of the nitrate nitrogen on-line instrument; k (K) 0 The addition coefficient is generally a constant 4; further, the value of the addition coefficient can be determined through experiments.
The embodiment of the invention also provides a carbon source accurate adding method, which adopts the carbon source accurate adding system and comprises the following steps:
determining whether the accurate carbon source adding system is used for a sewage treatment pre-denitrification system or a sewage treatment post-denitrification system, and if the accurate carbon source adding system is used for the sewage treatment pre-denitrification system, controlling the carbon source adding by a control device of the system according to the step 1; if the device is used for a sewage treatment post-denitrification system, the control device of the system performs carbon source adding control according to the step 2;
step 1, carbon source adding control for a sewage treatment pre-denitrification system comprises the following steps:
(A) Carbon source main feedback control: PID feedback control is carried out on the flow q of the dosing flowmeter according to the deviation between the set value of the feedforward nitrate nitrogen on-line instrument and the real-time measured value of the feedforward nitrate nitrogen on-line instrument, and feedback is carried out through the flow qControlling the dosing pump frequency to reach the required set value of the feedforward nitrate nitrogen on-line instrument; the method for determining the set value of the feedforward nitrate nitrogen on-line instrument is as follows: according to the real-time measured value of the feedback nitrate nitrogen online instrument, calculating the set value of the feedforward nitrate nitrogen online instrument according to the following fitting formula: n (N) 1 is provided with ＝m×N 2 reality +n; wherein: n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; m, n: in order to test the obtained coefficient according to the test, 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 water inflow Q of the sewage treatment pre-denitrification system exceeds a preset amplitude, performing carbon source feedforward compensation, wherein the carbon source feedforward compensation amount is determined according to the following formula: q q ＝q×(Q Real world /Q Is provided with -1); wherein: q q The feedforward compensation quantity of the carbon source is adopted; q, adding carbon source quantity for real-time main feedback; q (Q) Is provided with The method comprises the steps of designing water inflow; q (Q) Real world The actual inflow flow is shown;
(C) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission 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 on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument according to the real-time measured value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f The carbon source feedback compensation quantity; q (Q) Real world The actual inflow flow is shown; n (N) 2 reality The method is to feed back the real-time measured value of the nitrate nitrogen on-line instrument; n (N) 2 is provided with The method is to feed back the setting value of the nitrate nitrogen on-line instrument; k (K) 0 The addition coefficient is generally a constant 4;
step 2, carbon source adding control for a sewage treatment post-denitrification system comprises the following steps:
(D) Feedforward addition control: determining the feed-forward addition carbon source amount according to a feed-forward addition model formula, wherein the feed-forward is performed byThe formula of the feed addition model is as follows: q=k 0 ×Q Feeding in ×(N 1 practice of -N 1 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q: adding a carbon source amount for feedforward; q (Q) Feeding in : is the actual water inflow; n (N) 1 practice of : real-time measurement values of the feedforward nitrate nitrogen online instrument; n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; k (K) 0 The addition coefficient is generally a constant 4;
(E) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission standard of the sewage treatment post-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation quantity is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f : the compensation quantity is fed back for the carbon source; q (Q) Real world : is the actual water inflow; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; n (N) 2 is provided with : the method is used for feeding back a set value of the nitrate nitrogen on-line instrument; k (K) 0 The addition coefficient is generally a constant 4.
The invention will now be described in further detail with reference to the drawings and examples.
The embodiment of the invention provides a system and a method for adding carbon sources in the sewage treatment process, which are suitable for controlling the adding amount of the carbon sources in a denitrification system of a municipal sewage treatment plant, can improve the controlling level of adding the medicament, and effectively reduce the medicament consumption cost. Specifically, the device is matched with a control device through an on-line instrument, nitrate nitrogen is used as a control variable, and the nitrate nitrogen feedforward and feedback control mode is adopted to adjust the frequency of the variable-frequency dosing pump so as to realize different carbon source dosing amounts. The method specifically comprises the following steps: implementing feedforward compensation according to the fluctuation condition of inflow water flow, and implementing feedback compensation aiming at the out-of-line TN; by introducing feed-forward and feedback control of nitrate nitrogen and feed-forward and feedback compensation, the problem that single nitrate nitrogen feedback control is difficult to cope with fluctuation of water quality and water quantity is solved, accurate addition and stable control of carbon source are realized, and meanwhile, the process reaches the standard, so that efficient and stable operation of a sewage treatment system is realized.
The system and the method are used in a sewage treatment denitrification process (such as an anoxic tank, a denitrification filter tank and the like), can realize stable carbon source addition, adjust the dosing pump frequency in real time in a feedback manner according to the nitrate nitrogen concentration change of the reaction tank, and compensate the carbon source amount according to the condition of overhigh effluent TN by feedforward adjustment of the carbon source addition amount and the feedforward adjustment of the water quantity fluctuation condition, wherein the anoxic tank and the denitrification filter tank are used as reaction areas for front denitrification and rear denitrification, and the control modes of the anoxic tank and the denitrification filter tank are respectively described as follows:
the control mode used in the pre-denitrification system is (see fig. 1 and 3):
(1) An online nitrate nitrogen instrument 1#NO is arranged at the tail end of the anoxic tank 3 The 1#NO 3 Namely, the feed-forward nitrate nitrogen on-line instrument is adopted, an electromagnetic flowmeter Q is arranged on a water inlet pipe and is used as a water inlet flowmeter, and the tail end of the aerobic tank is provided with the on-line nitrate nitrogen instrument 2#NO 3 The 2#NO 3 The device is characterized in that a nitrate nitrogen on-line instrument is fed back, a variable-frequency dosing pump and a dosing flowmeter q are arranged on a carbon source feeding pipeline for feeding a carbon source to 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 1#NO 3 Real-time measurement of (1) and 1#NO 3 PID feedback control is carried out on the deviation of the set value of the dosing flowmeter to obtain the flow q (the flow q is the real-time feedback dosing carbon source quantity), and the variable-frequency dosing pump frequency is controlled to reach the required 1#NO according to the flow q feedback control 3 Is set at a set value of (2);
wherein 1#NO 3 The set value of (2) is according to TN discharge standard of the effluent of the tail end of the aerobic tank and 2#NO 3 Is set according to the real-time measured value of 2#NO 3 The real-time measurement value of (2) is calculated according to the following fitting formula:
N 1 is provided with ＝m×N 2 reality +n；
Wherein: n (N) 1 is provided with : 1#NO 3 Is set at a set value of (2);
N 2 reality : 2#NO 3 Real-time measurement of (2)
m, n: in order to test the obtained coefficient according to the test, the value of m is generally-1 to-0.25, and the value of n is 2.5 to 10;
due to 1#NO 3 Is set according to 2#NO 3 Is determined according to TN discharge standard of effluent from the end of the aerobic tank, so that 1#NO 3 Can be set according to 2#NO 3 Timing adjustment of real-time measured values) of the aerobic tank, during operation, according to TN discharge standard of effluent at the tail end of the aerobic tank, selecting 2#NO in a certain interval range 3 After one cycle of operation, the control device operates according to the number 2#NO 3 The real-time measured value of (1) is calculated according to the fitting formula to obtain 1#NO 3 1#NO during subsequent operation 3 The set value of (2) is according to 2#NO 3 Dynamically adjusting the real-time measurement of (c).
(3) Carbon source feedforward compensation control: in the operation process, if the inflow water flow Q of the anoxic tank exceeds a preset amplitude (the preset amplitude can be set as required, for example, 15 percent or other proportions), the carbon source feedforward compensation is carried out, and the carbon source feedforward compensation amount is determined according to the following formula: q q ＝q×(Q Real world /Q Is provided with -1)；
Wherein: q q : the feedforward compensation quantity is the carbon source;
q; adding carbon source amount for real-time feedback;
Q is provided with : the water inflow is designed;
Q real world : is the actual water inflow.
(4) Carbon source feedback compensation control: setting 2#NO according to TN discharge standard of effluent at the tail end of the aerobic tank 3 Is a certain value as the set value, if 2#NO 3 Exceeds the 2#NO in real time 3 And (3) carrying out carbon source feedback compensation after the set value of the carbon source is set, wherein the carbon source feedback compensation quantity is as follows: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with )；
Wherein q f : the compensation quantity is fed back for the carbon source;
Q real world : is the actual water inflow;
N 2 reality : 2#NO 3 Real-time measurements of (a);
N 2 is provided with : 2#NO 3 Is set at a set value of (2);
K 0 : for the addition factor, a constant of 4 is generally used, and the measurement can be performed by a test.
The control mode for the post-denitrification system is (see fig. 2 and 4):
(1) The front end of the denitrification filter is provided with an on-line nitrate nitrogen instrument 1#NO 3 The 1#NO 3 Namely, the feed-forward nitrate nitrogen on-line instrument is adopted, an electromagnetic flowmeter Q is arranged on a water inlet pipe and is used as a water inlet flowmeter, and the tail end of the denitrification filter tank is provided with the on-line nitrate nitrogen instrument 2#NO 3 The 2#NO 3 Namely, a feedback nitrate nitrogen on-line instrument is adopted, 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 denitrification filter tank in 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) Feedforward addition control: setting 1#NO according to effluent discharge standard of denitrification filter 3 According to the set value of the water inflow Q and 1#NO 3 A feedforward addition model is established according to a set value of the formula: q=k 0 ×Q Feeding in ×(N 1 practice of -N 1 is provided with )；
Wherein q: adding a carbon source amount for feedforward;
Q feeding in : is the actual water inflow;
N 1 practice of : 1#NO 3 Real-time measurements of (a);
N 1 is provided with : 1#NO 3 Is set at a set value of (2);
K 0 : for adding coefficients, a constant 4 is generally taken, and can be measured according to a test;
the control device adjusts the frequency of the variable-frequency dosing pump according to the feedforward dosing flow q to realize the required carbon source dosing flow.
(3) Carbon source feedback compensation control: setting 2#NO according to TN discharge standard of water discharged from the tail end of denitrification filter 3 Is a certain value as the set value, if 2#NO 3 Exceeds the 2#NO in real time 3 And (3) carrying out carbon source feedback compensation after the set value of the carbon source is set, wherein the carbon source feedback compensation amount is determined by the following company: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with )；
Wherein q f : the compensation quantity is fed back for the carbon source;
Q real world : is the actual water inflow;
N 2 reality : 2#NO 3 Real-time measurements of (a);
N 2 is provided with : 2#NO 3 Is set at a set value of (a).
K 0 : for the addition factor, 4 was generally taken according to the test measurement.
The invention has at least the following advantages: NO based denitrification system 3 The carbon source addition is controlled by feedforward and feedback to control the variable, so that the method is widely applicable to urban sewage treatment denitrification system units;
the control mode is based on process calculation, and has wide application in biochemical treatment by adopting an external carbon source adding system;
with NO 3 The feedforward and feedback are combined to control the carbon source adding flow of the variable-frequency dosing pump, and the feedforward flow is used for compensating adding, so that the problem of delay adjustment of the system caused by water quantity and water quality fluctuation is solved;
the aerobic Chi Xiao nitrogen is stable, the accuracy of the instrument for installing the nitrate nitrogen at the tail end of the aerobic tank is high, the influence of the fluctuation of the water quantity and the water quality at the front end of the anoxic tank installed by the instrument and the measurement error are solved, and the disturbance of large fluctuation and large delay to the system is solved;
the nitrate nitrogen measured at the tail end of the aerobic tank directly reflects the TN value of the water, the feedback compensation real-time performance is high, and the influence of system delay on TN stable standard is solved.
The system is applied to the project of AAO as the main process of 2 ten thousand tons per day, reduces the dosage of carbon source dosing by more than 15 percent, and can greatly reduce the operation intensity.
Examples
The embodiment provides a carbon source accurate adding system, and the carbon source accurate adding method of the system comprises the following steps:
under the condition of process operation, a sewage treatment plant in a certain town has a scale of 2 ten thousand tons per day, and the main process adopts an AAO process, so that the effluent is required to reach the surface 4-class emission standard, the ammonia nitrogen effluent is 1mg/L, and the TN effluent is 10mg/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 embodiment includes: the control device 1 consists of an automatic control cabinet 10 and an industrial personal computer 15, wherein an electrical 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 feedforward nitrate nitrogen on-line instrument 31 is arranged at the tail end of the anoxic tank, a feedback nitrate nitrogen on-line instrument 32 is arranged at the tail end of the aerobic tank, and an on-line electromagnetic flowmeter serving as a water inlet flowmeter 41 is arranged on a water inlet pipe; a variable-frequency dosing pump 2 driven by a variable-frequency motor is arranged between the dosing chambers;
the equipment and the instrument are connected with the automatic control cabinet through a power line and a signal line and are controlled by a PLC; the industrial personal computer is in communication connection with the automatic control cabinet;
the equipment and the instrument are installed and communication connection is established, and a control program is led into the PLC module;
the carbon source adding real-time control step (see fig. 3):
setting the set value of the feedback nitrate nitrogen on-line instrument 32 in different intervals to be 5-9mg/L according to the TN effluent quality standard lower than 10mg/L, setting different intervals according to the feedback nitrate nitrogen on-line instrument 32 and controlling the feedforward nitrate nitrogen on-line instrument 31, wherein the debugging values m and n are respectively-0.5 and 6, so that the values of the feedback nitrate nitrogen on-line instrument 32 in the control intervals 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 value of the feedforward nitrate nitrogen on-line instrument 31 is 3.5mg/L, 3.25mg/L, 3mg/L, 2.75mg/L, 2.5mg/L, 2.25mg/L, 1.75mg/L and 1.5mg/L, and the control device selects the set value of the feedforward nitrate nitrogen on-line instrument 31 according to the adjustment value; the flow q of the dosing flowmeter is feedback-controlled according to the deviation PID of the set value of the feedforward nitrate nitrogen on-line instrument 31 and the real-time measured value thereof, and the frequency of the variable-frequency dosing pump is feedback-controlled according to the flow q so that the feedforward nitrate nitrogen on-line instrument 31 reaches the required set value;
the water inflow (single sequence) of the water inflow meter 41 lasts for 30min to exceed 480m 3 /h or below 354m 3 Starting carbon source feedforward compensation at the time of/h, and carbonThe source feedforward compensation quantity is q q ＝q×(Q Real world 417-1), controlling a variable-frequency dosing pump to carry out carbon source dosing according to the carbon source feedforward compensation quantity;
the safety value of the feedback nitrate nitrogen on-line instrument 32 is set to be 8.5mg/L, and carbon source feedback compensation is started when the safety value exceeds the safety value, and the carbon source feedback compensation quantity is q f ＝4×Q Real world ×(N 2 reality -N 2 is provided with ) Controlling a variable-frequency dosing pump to carry out carbon source dosing according to the carbon source feedback compensation quantity;
during system operation, the feedback nitrate nitrogen on-line meter 32 is basically maintained at an upper and lower amplitude of 8-9 mg/L, and the TN test of the effluent is lower than 10mg/L, so that the stability reaches the standard. After the water quantity is impacted and fluctuated, the system can rapidly respond to perform carbon source feedback compensation, and when the abnormal faults of the main instrument numerical value cannot be automatically repaired, the system is switched to a constant medicament adding mode to perform carbon source adding, so that the system is prevented from causing error signal control. After 5 months of operation, the feeding system is stable to control the carbon source feeding, compared with the synchronous carbon source saving feeding amount of 16.2%, the reasonable control of nitrate nitrogen enables the total nitrogen effluent to reach the standard obviously, and the total nitrogen effluent can be basically stable within the emission standard.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. Accurate dosing system of carbon source, characterized by includes:
the device comprises a water inlet on-line flowmeter, a control device, a feedforward nitrate nitrogen on-line instrument, a feedback nitrate nitrogen on-line instrument, a variable-frequency dosing pump and a dosing flowmeter; wherein, the liquid crystal display device comprises a liquid crystal display device,
the water inlet online flowmeter is arranged on a water inlet pipe of the sewage treatment pre-denitrification system or the sewage treatment post-denitrification system, and the feedback end of the water inlet online flowmeter is electrically connected with the control device;
the feedforward nitrate nitrogen on-line instrument is arranged at the front end in an anoxic tank of the sewage treatment pre-denitrification system or in a denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feedforward nitrate nitrogen on-line instrument is electrically connected with the control device;
the feedback nitrate nitrogen on-line instrument is arranged at the rear end in the aerobic tank of the sewage treatment pre-denitrification system or in the denitrification filter tank of the sewage treatment post-denitrification system, and the feedback end of the feedback nitrate nitrogen on-line 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 sewage treatment pre-denitrification system or a denitrification filter tank of the sewage treatment post-denitrification system, a variable-frequency control end of the variable-frequency dosing pump is electrically connected with the control device, and a 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 according to the water inflow signal fed back by the water inflow online flowmeter and the nitrate nitrogen feedforward signal fed back by the feedforward nitrate nitrogen online meter and according to the nitrate nitrogen feedback signal fed back by the feedback nitrate nitrogen online meter, and adjust the carbon source dosing amount to the sewage treatment system according to the carbon source dosing feedback signal of the dosing flowmeter, specifically comprising the following steps:
if the control device is used for the sewage treatment pre-denitrification system, 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 on-line instrument and the real-time measured value of the feedforward nitrate nitrogen on-line instrument, and performing feedback control on the dosing pump frequency to reach the required set value of the feedforward nitrate nitrogen on-line instrument through the flow q; the method for determining the set value of the feedforward nitrate nitrogen on-line instrument is as follows: according to the real-time measured value of the feedback nitrate nitrogen online instrument, calculating the set value of the feedforward nitrate nitrogen online instrument according to the following fitting formula: n (N) 1 is provided with ＝m×N 2 reality +n; wherein: n (N) 1 is provided with : for feed-forward nitrate nitrogen inSetting values of the line instrument; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; m, n: in order to test the obtained coefficient according to the 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 water inflow Q of the sewage treatment pre-denitrification system exceeds a preset amplitude, performing carbon source feedforward compensation, wherein the carbon source feedforward compensation amount is determined according to the following formula: q q ＝q×(Q Real world /Q Is provided with -1); wherein: q q The feedforward compensation quantity of the carbon source is adopted; q, adding carbon source quantity for real-time main feedback; q (Q) Is provided with The method comprises the steps of designing water inflow; q (Q) Real world The actual inflow flow is shown;
(C) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission 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 on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument according to the real-time measured value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f The carbon source feedback compensation quantity; q (Q) Real world The actual inflow flow is shown; n (N) 2 reality The method is to feed back the real-time measured value of the nitrate nitrogen on-line instrument; n (N) 2 is provided with The method is to feed back the setting value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is constant 4;
if the control device is used for a sewage treatment post-denitrification system, the control mode of the control device comprises the following steps:
(D) Feedforward addition control: determining the feed-forward addition carbon source amount according to a feed-forward addition model formula, wherein the feed-forward addition model formula is as follows: q=k 0 ×Q Feeding in ×(N 1 practice of -N 1 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q: adding a carbon source amount for feedforward; q (Q) Feeding in : is the actual water inflow; n (N) 1 practice of : real-time measurement values of the feedforward nitrate nitrogen online instrument; n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; k (K) 0 The value of the addition coefficient is constant 4;
(E) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission standard of the sewage treatment post-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation quantity is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f : the compensation quantity is fed back for the carbon source; q (Q) Real world : is the actual water inflow; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; n (N) 2 is provided with : the method is used for feeding back a set value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is constant 4.
2. The accurate carbon source adding system according to claim 1, wherein the control device consists of an industrial personal computer and an automatic control cabinet which are in communication connection;
the automatic control cabinet is electrically connected with the variable-frequency dosing pump, the water inlet on-line flowmeter, the first nitrate nitrogen on-line instrument and the second nitrate nitrogen on-line instrument respectively.
3. The accurate carbon source adding system according to claim 1 or 2, wherein the water inlet on-line flowmeter is an electromagnetic flowmeter.
4. A method for accurately adding a carbon source, characterized by adopting the carbon source accurate adding system as claimed in any one of claims 1 to 3, comprising the following steps:
determining whether the accurate carbon source adding system is used for a sewage treatment pre-denitrification system or a sewage treatment post-denitrification system, and if the accurate carbon source adding system is used for the sewage treatment pre-denitrification system, controlling the carbon source adding by a control device of the system according to the step 1; if the device is used for a sewage treatment post-denitrification system, the control device of the system performs carbon source adding control according to the step 2;
step 1, carbon source adding control for a sewage treatment pre-denitrification system 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 on-line instrument and the real-time measured value of the feedforward nitrate nitrogen on-line instrument, and performing feedback control on the dosing pump frequency to reach the required set value of the feedforward nitrate nitrogen on-line instrument through the flow q; the method for determining the set value of the feedforward nitrate nitrogen on-line instrument is as follows: according to the real-time measured value of the feedback nitrate nitrogen online instrument, calculating the set value of the feedforward nitrate nitrogen online instrument according to the following fitting formula: n (N) 1 is provided with ＝m×N 2 reality +n; wherein: n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; m, n: to test the resulting coefficients according to the test;
(B) Carbon source feedforward compensation control: after the water inflow Q of the sewage treatment pre-denitrification system exceeds a preset amplitude, performing carbon source feedforward compensation, wherein the carbon source feedforward compensation amount is determined according to the following formula: q q ＝q×(Q Real world /Q Is provided with -1); wherein: q q The feedforward compensation quantity of the carbon source is adopted; q, adding carbon source quantity for real-time main feedback; q (Q) Is provided with The method comprises the steps of designing water inflow; q (Q) Real world The actual inflow flow is shown;
(C) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission 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 on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument according to the real-time measured value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation amount is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f The carbon source feedback compensation quantity; q (Q) Real world The actual inflow flow is shown; n (N) 2 reality The method is to feed back the real-time measured value of the nitrate nitrogen on-line instrument; n (N) 2 is provided with The method is to feed back the setting value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is constant 4;
step 2, carbon source adding control for a sewage treatment post-denitrification system comprises the following steps:
(D) Feedforward addition control: determining the feed-forward addition carbon source amount according to a feed-forward addition model formula, wherein the feed-forward addition model formula is as follows: q=k 0 ×Q Feeding in ×(N 1 practice of -N 1 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q: adding a carbon source amount for feedforward; q (Q) Feeding in : is the actual water inflow; n (N) 1 practice of : real-time measurement values of the feedforward nitrate nitrogen online instrument; n (N) 1 is provided with : the method is used for feeding forward nitrate nitrogen to a set value of an online instrument; k (K) 0 The value of the addition coefficient is constant 4;
(E) Carbon source feedback compensation control: setting a set value of the feedback nitrate nitrogen on-line instrument according to the effluent TN emission standard of the sewage treatment post-denitrification system, and performing carbon source feedback compensation after the real-time measured value of the feedback nitrate nitrogen on-line instrument exceeds the set value of the feedback nitrate nitrogen on-line instrument, wherein the carbon source feedback compensation quantity is determined according to the following formula: q f ＝K 0 ×Q Real world ×(N 2 reality -N 2 is provided with ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein q f : the compensation quantity is fed back for the carbon source; q (Q) Real world : is the actual water inflow; n (N) 2 reality : real-time measurement values of the nitrate nitrogen on-line instrument are fed back; n (N) 2 is provided with : the method is used for feeding back a set value of the nitrate nitrogen on-line instrument; k (K) 0 The value of the addition coefficient is constant 4.
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| CN111470628B (en) * | 2020-04-16 | 2020-12-15 | 北京恒润慧创环境技术有限公司 | Carbon source medicament adding equipment and adding method |
| 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 |
| 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 |
| CN113044973B (en) * | 2021-03-18 | 2023-05-16 | 苏州美淼环保科技有限公司 | Sewage treatment control system and effluent TN control method |
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298259A (en) * | 2014-09-29 | 2015-01-21 | 清华大学 | Carbon source addition feedforward-feedback control device and method |
| CN210764598U (en) * | 2019-06-25 | 2020-06-16 | 北京首创股份有限公司 | Accurate adding system of carbon source |
-
2019
- 2019-06-25 CN CN201910555235.XA patent/CN110127863B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298259A (en) * | 2014-09-29 | 2015-01-21 | 清华大学 | Carbon source addition feedforward-feedback control device and method |
| CN210764598U (en) * | 2019-06-25 | 2020-06-16 | 北京首创股份有限公司 | Accurate adding system of carbon source |
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