CN114275876A - Accurate and intelligent carbon source adding control system and method - Google Patents
Accurate and intelligent carbon source adding control system and method Download PDFInfo
- Publication number
- CN114275876A CN114275876A CN202111619852.5A CN202111619852A CN114275876A CN 114275876 A CN114275876 A CN 114275876A CN 202111619852 A CN202111619852 A CN 202111619852A CN 114275876 A CN114275876 A CN 114275876A
- Authority
- CN
- China
- Prior art keywords
- carbon source
- plc
- anoxic zone
- water
- nitrate nitrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 230000009467 reduction Effects 0.000 claims abstract description 21
- 239000003814 drug Substances 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 11
- 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 description 65
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 18
- 238000010992 reflux Methods 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 235000017281 sodium acetate Nutrition 0.000 claims description 12
- 239000001632 sodium acetate Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 8
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- 229940040526 anhydrous sodium acetate Drugs 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 125000001477 organic nitrogen group Chemical group 0.000 claims description 3
- 230000008569 process Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 9
- 101100190617 Arabidopsis thaliana PLC2 gene Proteins 0.000 description 8
- 101100408456 Arabidopsis thaliana PLC8 gene Proteins 0.000 description 8
- 101100464304 Caenorhabditis elegans plk-3 gene Proteins 0.000 description 8
- 101100093534 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPS1B gene Proteins 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- 102100026205 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1 Human genes 0.000 description 5
- 101100190618 Arabidopsis thaliana PLC3 gene Proteins 0.000 description 5
- 101000691599 Homo sapiens 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1 Proteins 0.000 description 5
- 238000007405 data analysis Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- GFEWRKPOYXKQKX-UHFFFAOYSA-I [C+4].C(C)(=O)[O-].[Na+].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-] Chemical compound [C+4].C(C)(=O)[O-].[Na+].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-] GFEWRKPOYXKQKX-UHFFFAOYSA-I 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a system and a method for controlling accurate and intelligent addition of a carbon source, which comprise an online monitoring system, a carbon source adding system, a first PLC (programmable logic controller), a second PLC and a third PLC, wherein the carbon source adding system is electrically connected with the first PLC to control the addition of the carbon source; the online monitoring system collects inlet and outlet water TN through an instrument, the instantaneous flow of inlet water, ammonia nitrogen, COD data and anoxic zone DO, the pH value and the ORP value, the instrument of the online monitoring system is electrically connected with the second PLC controller, the third PLC controller is used as a sampling and sample-testing master control PLC, receives a second PLC controller sample-testing command, sends the command to the instrument for sampling, sample reserving and testing and feeds the sample testing result back to the second PLC controller, and a water sample pretreatment unit is arranged between the anoxic zones of the biochemical pool. The system and the method for controlling the accurate and intelligent addition of the carbon source realize the accurate and automatic addition of the carbon source medicament, improve the medicament addition efficiency and realize the control and reduction of the medicament cost.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a system and a method for controlling accurate and intelligent addition of a sodium acetate carbon source.
Background
The AAO process and the improved AAO process are the most common sewage denitrification and dephosphorization processes in the urban sewage treatment process in China, and the standard discharge of treated effluent and the energy saving and consumption reduction in the operation process are of great significance for protecting the surface water environment in China. Due to the influence of factors such as inlet water load fluctuation, the AAO process is generally difficult to maintain stable and efficient pollutant removal capacity. The addition of an external carbon source is an important strategy for reducing the total nitrogen concentration of effluent. And when the external carbon source is added, the amount of the external carbon source is accurate and proper, the removal of nitrate nitrogen in the denitrification process is ensured, the effluent is ensured to reach the standard stably, the adding amount of the medicament is reduced as far as possible, and the production cost is reduced, wherein the balance is difficult to achieve by artificial regulation and control and needs to be realized by an intelligent accurate control system.
At present, the adding amount of the carbon source is calculated and mostly controlled according to the following modes: controlling the total nitrogen concentration of the effluent to be less than a preset value, and when the measured value of the total nitrogen concentration of the effluent exceeds the preset value, externally feeding a carbon source to the anoxic zone of the biochemical pool. The adding of the carbon source is based on the difference value of the total nitrogen concentration of inlet water and outlet water, the adding amount of the carbon source is calculated, the calculation result is relatively extensive, the deviation between the theoretical adding amount and the actual adding amount of the medicament is relatively large, on the other hand, if the operating conditions of the anoxic zone of the biochemical tank are not effectively controlled, the medicament amount is only increased once, for example, the adding of the carbon source is increased under the conditions of overhigh dissolved oxygen and low temperature of the anoxic zone of the biochemical tank, the denitrification rate is not increased, but the medicament is utilized by the dissolved oxygen, the utilization rate of the carbon source is influenced, and the medicament waste is caused.
At present, a nitrate nitrogen online analyzer adopting an ultraviolet absorption double-beam measurement method is used for analyzing the content of nitrate in an anoxic zone of a biochemical pool, a reagent and a sample are not required to be pretreated, the reaction analysis speed is high, but experiments prove that the sensor is easily influenced by the sludge concentration in the anoxic zone of the biochemical pool, the data is unstable, and the accuracy is reduced when the dosage is calculated.
In the prior art, a control system calculates the carbon source addition: for example, the invention discloses an AAO process carbon source adding control system in Chinese patent with publication number CN113277685A, which comprises an anaerobic tank, a biochemical tank anoxic zone and an aerobic tank which are connected in sequence, wherein the biochemical tank anoxic zone is provided with a carbon source adding unit; the carbon source adding unit comprises a strategy control module and a filtering module, the filtering module filters a water sample in an anoxic zone of the biochemical pool to avoid the interference of sludge concentration on an instrument, and the strategy control module adds an external carbon source by using a control mode of feedforward and cascade feedback. The invention also discloses a device and a method for automatically determining the optimal adding ratio of a denitrification carbon source and the continuous adding stabilization time of the denitrification carbon source in Chinese patent with the publication number of CN113307365A, the device automatically determines the optimal adding ratio of the denitrification carbon source by measuring nitrate on line, and the device automatically determines the optimal adding ratio of the denitrification carbon source comprises: the reaction system is used for simulating a denitrification environment for denitrification of the activated sludge; the stirring system is used for stirring the activated sludge in the reaction system and ensuring the concentration of the dissolved oxygen to be zero; the online monitoring system is used for monitoring the concentration of dissolved oxygen and the concentration of nitrate and nitrogen in the reaction system; the carbon source adding system is used for adding a carbon source into the reaction system; the control system is used for controlling the entry and the stirring of the activated sludge in the reaction system, the transmission of monitoring data and the addition of a carbon source; and the data acquisition and processing system is used for acquiring and processing the monitoring data and determining the optimal adding ratio of the denitrification external carbon source.
The above prior art still has the following disadvantages:
(1) the carbon source adding system and the production process control the cracking, the effective linkage can not be realized, the simple offline calculation of the adding dosage and the manual adjustment can only be realized, and the requirement of accurate adding control can not be met.
(2) The carbon source dosing system can not be used according to the treatment water amount, the sewage plant inlet water TN, the carbon source efficiency of the biochemical treatment system and the anoxic zone NO of the biochemical pool3N, effluent TN, trueThe dosage is adjusted, and the metering mode is relatively extensive.
(3) The carbon source dosing system does not jointly monitor the process operating conditions of the anoxic zone of the biochemical pool, so that the maximum utilization of the carbon source is realized.
(4) The front end of the nitrate nitrogen determinator of the carbon source dosing system is not additionally provided with a water sample collection pretreatment device, so that the deviation of instrument detection data is large.
Disclosure of Invention
The invention aims to provide a system and a method for controlling accurate and intelligent addition of a carbon source, and aims to solve the problems in the background art.
The invention discloses a precise and intelligent carbon source adding control system which comprises an online monitoring system, a carbon source adding system, a first PLC (programmable logic controller), a second PLC and a third PLC, wherein the online monitoring system comprises a nitrate nitrogen analyzer and an environment-friendly data acquisition instrument, and the carbon source adding system is electrically connected with the first PLC to control the adding of a carbon source; the environmental protection data acquisition instrument gathers business turn over water TN, the instantaneous flow of intaking, the ammonia nitrogen, COD data and nitrate nitrogen analyzer gather biochemical pond anoxic zone DO, the pH value, the ORP value, on-line monitoring system's instrument all with second PLC controller electrical connection, the third PLC controller is as sample appearance master control PLC that surveys, accept second PLC controller and survey the appearance order, and send the order and take a sample for nitrate nitrogen analyzer, reserve the appearance and detect and feed back the second PLC controller with the sample detection result, set up water sample preprocessing unit between nitrate nitrogen analyzer and the biochemical pond anoxic zone, nitrate nitrogen analyzer takes a sample from water sample preprocessing unit, reserve the appearance and detect.
Further, data transmission is carried out between the third PLC controller and the second PLC controller and between the first PLC controller and the second PLC controller through an industrial Ethernet switch.
Furthermore, the industrial Ethernet switch is also connected with an industrial Internet of things gateway or an edge computer
The method for controlling the accurate and intelligent addition of the carbon source by using the system comprises a carbon source addition control step, specifically comprises the steps of measuring and calculating the instantaneous addition of the carbon source according to nitrate nitrogen reduction data in an anoxic zone of a biochemical pool, transmitting theoretical calculation flow to a first PLC control system, regulating and controlling the frequency of a dosing flowmeter in real time by the control system based on a PID algorithm to realize the accurate control of the addition of the medicament, wherein a calculation model of the nitrate nitrogen reduction data in the anoxic zone of the biochemical pool is as follows:
addition of carbon source K.times.DELTA.NO3-N×Q/(0.78*1000*C)
Wherein, K: the COD equivalent required for converting each unit of nitrate nitrogen into nitrogen is mgCOD/mgN, which is generally 4-7;
ΔNO3-N: NO in anoxic zone of biochemical pool3-N total reduction, mg/L;
q: amount of inlet water, m3/h；
0.78: the carbon source adopts sodium acetate, and the COD equivalent (kgCOD/kg sodium acetate) of anhydrous sodium acetate is added;
c: the effective component of anhydrous sodium acetate is added in percent;
wherein Delta NO3Value of-N (NO in anoxic zone of biochemical pool)3-N total reduction) is obtained by subtracting the target value of nitrate nitrogen in the anoxic zone of the biochemical pool and the target value of nitrate nitrogen in effluent, which are comprehensively calculated according to nitrate nitrogen in influent water, nitrate nitrogen in the anoxic zone of the biochemical pool and nitrate nitrogen in internal reflux liquid, and the specific calculation is as follows:
ΔNO3-N＝[(NO3-Ninflow water×QAmount of inlet water+NO3-NActual measurement of anoxic zone of biochemical pool×VEffective tank capacity of anoxic zone of biochemical tank+NO3-NInternal reflux liquid×Q Internal reflux amount)/VEffective tank capacity of anoxic zone of biochemical tank]-(TNTarget value of water outlet-NH3-NDischarging water) And neglecting organic nitrogen and nitrite nitrogen in the effluent, wherein the difference between the total nitrogen target value of the effluent and ammonia nitrogen is the nitrate nitrogen target value of the effluent.
The accurate intelligent carbon source adding control system has the beneficial effects that:
1) the method comprises the steps of measuring and calculating the instantaneous adding amount of an external carbon source according to nitrate nitrogen reduction data in an anoxic zone of a biochemical pool, transmitting theoretically calculated adding flow to a carbon source accurate adding PLC control system, and controlling the frequency of a dosing metering pump in real time by the control system based on a PID (proportion integration differentiation) algorithm to realize the accurate control of the adding amount of a medicament;
2) the invention can monitor Dissolved Oxygen (DO), oxidation-reduction potential (ORP), pH and temperature in the anoxic zone of the biochemical pool, if deviation occurs, alarm can be started, information is transmitted to the central control room, and operating personnel can control the operating conditions of the anoxic zone of the biochemical pool by process regulation, such as reduction of aeration amount, reduction of reflux amount and the like, so as to ensure the denitrification efficiency of the anoxic zone of the biochemical pool and the utilization rate of an external carbon source, and reduce the waste of medicaments as much as possible;
3) the nitrate nitrogen reduction data of the anoxic zone of the biochemical tank fully considers three indexes of nitrate nitrogen in raw water, original nitrate nitrogen in the anoxic zone of the biochemical tank and nitrate nitrogen in internal reflux liquid, so that the measured and calculated data source is more three-dimensional, but not a single index of nitrate nitrogen in water, meanwhile, a static settling tank is additionally arranged in front of the nitrate nitrogen analyzer, mud-water mixtures at three points are respectively collected through time sequence control, and after the mud-water mixtures enter the static settling tank and are respectively statically settled, supernatant is collected for detection, so that the interference of active sludge on sample detection is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a sewage treatment system using the accurate and intelligent carbon source adding control system of the present invention.
FIG. 2 is a schematic structural diagram of a precise intelligent carbon source adding control system according to the present invention.
FIG. 3 is a schematic structural diagram of a standing tank arranged between a nitrate nitrogen analyzer and an anoxic zone of a biochemical tank.
In the figure: a carbon source dosing flowmeter-1, a carbon source dosing metering pump-2 and a nitrate nitrogen sampling and sample reserving analyzer-3; the system comprises a carbon source storage tank-4, a programmable logic controller-5, an industrial Ethernet switch-6, an industrial Internet of things gateway-7, a carbon source adding data analysis platform-8, a sampling water inlet electromagnetic valve-9, a sampling water inlet pipe-10, a detection sampling pump-11, a sample measuring sampling pump-12 and an emptying electromagnetic valve-13.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The technical scheme of the invention is a precise and intelligent carbon source adding control system, and is shown in fig. 2 and fig. 3, wherein fig. 1 is a water treatment system applying the adding system of the invention, the precise and intelligent carbon source adding control system of the embodiment comprises a carbon source adding system consisting of a carbon source adding flowmeter 1 and a carbon source adding metering pump 2, and the carbon source adding system is electrically connected with a PLC1 controller; a nitrate nitrogen sampling and sample reserving analyzer 3; a carbon source storage tank 4; the PLC programmable logic controller 5 comprises a PLC1 controller, a PLC2 controller and a PLC3 controller; an industrial ethernet switch 6; an industrial Internet of things gateway 7; a carbon source adding data analysis platform 8; a sampling water inlet electromagnetic valve 9; sampling the water inlet pipe 10; a detection sampling pump 11; a sample measuring and sampling pump 12; an air defense solenoid valve 13; a sample collection static sedimentation tank is arranged between the anoxic zone of the biochemical tank and the nitrate nitrogen sampling and sample retention analysis instrument 3 and serves as a water sample pretreatment unit, a detection sampling pump 11 collects water in the anoxic zone of the biochemical tank and firstly enters the static sedimentation tank, and the nitrate nitrogen sampling and sample retention analysis instrument 3 takes water in the static sedimentation tank through a sample measurement sampling pump 12.
This embodiment PLC programmable logic controller includes PLC1 controller, PLC2 controller, PLC3 controller, PLC2 gathers into, go out water on-line monitoring TN, the ammonia nitrogen, intake flowmeter instantaneous flow data, biochemical pond anoxic zone nitrate nitrogen, biochemical pond anoxic zone dissolved oxygen, the redox potential, pH and temperature, can consider directly to gather from environmental protection data acquisition instrument, generally adopt Modbus RTU or Modbus TCP communication, to can directly following the analysis instrument collection of being unqualified, adopt the communication of Modbus RTU to guarantee the data uniformity. The data of the nitrate nitrogen instrument in the anoxic zone of the biochemical pool is collected in a communication mode, and Modbus RTU or Modbus TCP communication is generally adopted.
The PLC1 is used as a master control PLC and mainly controls the feeding of a diaphragm metering pump for the drug carbon source, the feeding flow of the instantaneously fed carbon source is calculated according to a theoretical feeding amount calculation formula, the feeding flow is adjusted in real time mainly according to target values of nitrate nitrogen of water inlet in an anoxic zone of a biochemical pool of a biochemical system, nitrate nitrogen of internal reflux and nitrate nitrogen of effluent in the anoxic zone of the biochemical pool, and the calculation formula is as follows.
Addition of carbon source K.times.DELTA.NO3-N×Q/(0.78*1000*C)
Wherein, K: the COD equivalent required for converting each unit of nitrate nitrogen into nitrogen is mgCOD/mgN, which is generally 4-7;
ΔNO3-N: NO in anoxic zone of biochemical pool3-N total reduction, mg/L;
q: amount of inlet water, m3/h；
0.78: the carbon source adopts sodium acetate, and the COD equivalent (kgCOD/kg sodium acetate) of anhydrous sodium acetate is added;
c: the effective component of anhydrous sodium acetate is added in percent;
wherein Delta NO3Value of-N (NO in anoxic zone of biochemical pool)3-N total reduction) is obtained by subtracting the target value of nitrate nitrogen in the anoxic zone of the biochemical pool and the target value of nitrate nitrogen in effluent, which are comprehensively calculated according to nitrate nitrogen in influent water, nitrate nitrogen in the anoxic zone of the biochemical pool and nitrate nitrogen in internal reflux liquid, and the specific calculation is as follows:
ΔNO3-N＝[(NO3-Ninflow water×QAmount of inlet water+NO3-NActual measurement of anoxic zone of biochemical pool×VEffective tank capacity of anoxic zone of biochemical tank+NO3-NInternal reflux liquid×Q Internal reflux amount)/VEffective tank capacity of anoxic zone of biochemical tank]-(TNTarget value of water outlet-NH3-NDischarging water) And neglecting organic nitrogen and nitrite nitrogen in the effluent, wherein the difference between the total nitrogen target value of the effluent and ammonia nitrogen is the nitrate nitrogen target value of the effluent.
The PLC3 is used as a sampling and sample-measuring master control PLC, receives a PLC2 controller sample-measuring command, extracts different water sample points to detect liquid levels by controlling a sampling pump and an electromagnetic valve, and sends a command to a nitrate nitrogen analysis instrument to perform sampling, sample retention and detection after the static settling tank is kept still for a period of time, and feeds back a sample detection result to the PLC2 controller.
The carbon source adding data analysis platform acquires and comprehensively analyzes data such as the water quality condition of inlet water of a sewage plant, the adding condition of carbon source agents, the denitrification efficiency of a biochemical pool, the water quality condition of outlet water, the running condition of the biochemical pool and the like through an industrial internet of things gateway or edge calculation, can provide decision basis through analysis, continuously optimizes a carbon source adding calculation model, and realizes intelligent control of a denitrification carbon source adding system of a biochemical system.
When the system starts to work, water samples at different point positions in the anoxic zone of the biochemical tank are respectively extracted by starting and stopping the sampling water inlet electromagnetic valve 9 and the detection sampling pump 11 and enter the sample collection sedimentation tank, then supernatant of the sedimentation tank is respectively extracted by utilizing the sample detection sampling pump 12, the nitrate nitrogen sampling and sample retention analyzer 3 is utilized for respectively detecting, and the time control starting and stopping the empty electromagnetic valve 13 is utilized for discharging residual muddy water mixed liquid in the sedimentation tank.
Nitrate nitrogen data of 3 points of an anoxic zone respectively detected by a nitrate nitrogen sampling and sample reserving analyzer 3 are transmitted to a PLC3 controller, the PLC3 controller transmits the data to a PLC2 controller through an industrial Ethernet switch 6, the data of inlet and outlet water TN, inlet instantaneous flow, ammonia nitrogen and COD of the environmental-friendly data acquisition instrument are synchronously acquired to a PLC2 controller, the PLC2 controller is used for calculating the instantaneous carbon source adding amount according to a set calculation formula, the calculated data are transmitted to a PLC1 controller through the industrial Ethernet switch 6, and the frequency of a carbon source adding metering pump 2 is adjusted in real time based on a PID algorithm according to the calculated instantaneous carbon source adding amount and the data of a carbon source adding flowmeter 1, so that the adjustment of the instantaneous carbon source adding amount on site is realized.
The acquired or calculated instantaneous data can be transmitted to an industrial Internet of things gateway or an edge computer 7 through an industrial Ethernet switch 6 for long-term storage and is uploaded to a carbon source adding data analysis platform 8, and functions of big data analysis, abnormal alarm and the like are further realized.
The following table 1 shows the values of the parameters of each instrument displayed by a sewage project control system and the carbon source addition quantity calculated by using the system and the core formula of the invention.
TABLE 1
As can be seen from the table above, the dosage of the sodium acetate in the anoxic zone of the biochemical pool can be accurately controlled by adopting the calculation model. The upper table comprises the steps of automatically acquiring data such as the instantaneous water inlet amount, the TN (total internal control) of water inlet, the ammonia nitrogen of water inlet, the TN (total internal control) of water outlet, the TN of water outlet, the ammonia nitrogen of water outlet and the like of the environment-friendly data acquisition instrument through a PLC (programmable logic controller), then manually inputting basic parameters including parameters such as a water outlet standard limit value (namely an internal control value of the TN of water outlet), the COD (chemical oxygen demand) equivalent of sodium acetate, the effective components of sodium acetate, the density of sodium acetate, the COD equivalent required for converting each unit of nitrate nitrogen into nitrogen, the effective volume of an anoxic zone of a biochemical pool, the number of biochemical pool groups, the number of carbon source dosing metering pumps of each group of biochemical pool, an internal reflux ratio and the like, respectively calculating the total reduction of nitrate nitrogen in the anoxic zone and the instantaneous dosage of sodium acetate solution by using a core calculation formula, and finally outputting the instantaneous dosage of single pump of each group of biochemical pool. Meanwhile, a deviation analysis function is added to verify whether the adding amount calculated by the system theory is consistent with the actual adding amount or not, and the accurate calculation and accurate adding of the dosage of the medicament are ensured, wherein the theoretical and actual execution deviation rate is 1.01% as shown in the table, which indicates that the item has good accurate adding effect of the sodium acetate, and the outlet water TN is lower than the outlet water limit value, so that the stable standard of the outlet water and the fine control effect of the medicament are finally achieved.
The system and the calculation model of the invention have the following effects:
1) the method comprises the steps of measuring and calculating the instantaneous adding amount of an external carbon source according to nitrate nitrogen reduction data in an anoxic zone of a biochemical pool, transmitting theoretical calculated flow to a carbon source accurate adding PLC control system, and controlling the frequency of a medicine adding flow meter in real time by the control system based on a PID algorithm to realize the accurate control of the adding amount of a medicament;
2) the invention can monitor Dissolved Oxygen (DO), oxidation-reduction potential (ORP), pH and temperature in the anoxic zone of the biochemical pool, if deviation occurs, alarm can be started, information is transmitted to the central control room, and operating personnel can control the operating conditions of the anoxic zone of the biochemical pool by process regulation, such as reduction of aeration amount, reduction of reflux amount and the like, so as to ensure the denitrification efficiency of the anoxic zone of the biochemical pool and the utilization rate of an external carbon source, and reduce the waste of medicaments as much as possible;
3) the nitrate nitrogen reduction data of the anoxic zone of the biochemical tank fully considers three indexes of nitrate nitrogen in raw water, original nitrate nitrogen in the anoxic zone of the biochemical tank and nitrate nitrogen in internal reflux liquid, so that the measured and calculated data source is more three-dimensional, but not a single index of nitrate nitrogen in water inlet.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the present specification and drawings, or used directly or indirectly in other related fields, are included in the scope of the present invention.
Claims (6)
1. A carbon source accurate intelligent adding control system is characterized by comprising an online monitoring system, a carbon source adding system, a first PLC (programmable logic controller), a second PLC and a third PLC, wherein the carbon source adding system is electrically connected with the first PLC; the online monitoring system collects inlet and outlet water TN, inflow instantaneous flow, ammonia nitrogen, COD data and anoxic zone DO of the biochemical pool, pH value and ORP value through instruments, the instruments of the online monitoring system are electrically connected with the second PLC, the third PLC is used as sampling and sample testing master control PLC, receives a sample testing command of the second PLC, sends the command to the instruments for sampling, sample reserving and testing and feeds a sample testing result back to the second PLC, and the biochemical pool is provided with a water sample pretreatment unit.
2. The system for accurately and intelligently feeding and controlling the carbon source according to claim 1, wherein the online monitoring system comprises a nitrate nitrogen analyzer and an environment-friendly data acquisition instrument which are electrically connected with the second PLC, the nitrate nitrogen analyzer acquires DO, pH value and ORP value of an anoxic zone of the biochemical tank, and the environment-friendly data acquisition instrument acquires TN, instantaneous inflow, ammonia nitrogen and COD data of inlet and outlet water.
3. The system for accurately and intelligently adding the carbon source as claimed in claim 1, wherein the water sample pretreatment unit adopts a static sedimentation tank, and water collected in an anoxic zone of a biochemical tank firstly enters the static sedimentation tank and then enters a nitrate nitrogen analyzer.
4. The system for accurately and intelligently adding the carbon source as claimed in claim 1, wherein data transmission is performed between the third PLC and the second PLC, and between the first PLC and the second PLC through an industrial Ethernet switch.
5. The accurate intelligent carbon source dosing control system as claimed in claim 1, wherein the industrial ethernet switch is further connected to an industrial internet of things gateway or an edge computer.
6. A carbon source accurate intelligent dosing control method comprises a carbon source dosing control step and is characterized in that the instantaneous dosing of an external carbon source is measured and calculated according to nitrate nitrogen reduction data of an anoxic zone of a biochemical pool, a theoretical calculation flow is transmitted to a first PLC control system, the control system regulates and controls dosing flowmeter frequency in real time based on a PID algorithm to realize accurate control of the dosing of a medicament, and a calculation model of the nitrate nitrogen reduction data of the anoxic zone of the biochemical pool is as follows:
addition of carbon source K.times.DELTA.NO3-N×Q/(0.78*1000*C)
Wherein, K: the COD equivalent required for converting each unit of nitrate nitrogen into nitrogen is mgCOD/mgN, which is generally 4-7;
ΔNO3-N: NO in anoxic zone of biochemical pool3-N total reduction, mg/L;
q: amount of inlet water, m3/h；
0.78: the carbon source adopts sodium acetate, and the COD equivalent (kgCOD/kg sodium acetate) of anhydrous sodium acetate is added;
c: the effective component of anhydrous sodium acetate is added in percent;
wherein Delta NO3Value of-N (NO in anoxic zone of biochemical pool)3-N total reduction) is obtained by subtracting the target value of nitrate nitrogen in the anoxic zone of the biochemical pool and the target value of nitrate nitrogen in effluent, which are comprehensively calculated according to nitrate nitrogen in influent water, nitrate nitrogen in the anoxic zone of the biochemical pool and nitrate nitrogen in internal reflux liquid, and the specific calculation is as follows:
ΔNO3-N＝[(NO3-Ninflow water×QAmount of inlet water+NO3-NActual measurement of anoxic zone of biochemical pool×VEffective tank capacity of anoxic zone of biochemical tank+NO3-NInternal reflux liquid×QInternal reflux amount)/VEffective tank capacity of anoxic zone of biochemical tank]-(TNTarget value of water outlet-NH3-NDischarging water) And neglecting organic nitrogen and nitrite nitrogen in the effluent, wherein the difference between the total nitrogen target value of the effluent and ammonia nitrogen is the nitrate nitrogen target value of the effluent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111619852.5A CN114275876B (en) | 2021-12-27 | 2021-12-27 | Accurate and intelligent carbon source adding control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111619852.5A CN114275876B (en) | 2021-12-27 | 2021-12-27 | Accurate and intelligent carbon source adding control system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114275876A true CN114275876A (en) | 2022-04-05 |
| CN114275876B CN114275876B (en) | 2024-07-02 |
Family
ID=80876662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111619852.5A Active CN114275876B (en) | 2021-12-27 | 2021-12-27 | Accurate and intelligent carbon source adding control system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114275876B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482686A (en) * | 2019-03-26 | 2019-11-22 | 浙江海牛环境科技股份有限公司 | A kind of system and method proposing effect suitable for the consumption reduction of oxidation ditch biological denitrification |
| CN114790039A (en) * | 2022-05-27 | 2022-07-26 | 四川开泽环境科技有限公司 | Intelligent denitrification regulation and control method and system for aquaculture wastewater |
| CN115108644A (en) * | 2022-07-07 | 2022-09-27 | 迈邦（北京）环保工程有限公司 | Online nutrient dosing method, device, equipment and storage medium |
| CN115353200A (en) * | 2022-07-12 | 2022-11-18 | 苏州水星环保工业系统有限公司 | Sewage plant effluent TN intelligent control system and 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 |
| CN119080211A (en) * | 2024-10-09 | 2024-12-06 | 深圳市盘龙环境技术有限公司 | A sewage system dosing device for VFAs prepared from food waste |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495321A (en) * | 2016-10-11 | 2017-03-15 | 美尚生化环境技术（上海）有限公司 | Biological tank process optimization and operation control system and its control method |
| CN108191052A (en) * | 2017-12-28 | 2018-06-22 | 北京中环嘉诚环境工程有限公司 | Carbon source Intelligent adding system for powered and its application in sewage disposal |
| CN109809560A (en) * | 2019-02-25 | 2019-05-28 | 北控水务(中国)投资有限公司 | A kind of accurate dosing control device of carbon source and method of multipoint water feeding multistage A/O technique |
| CN110422928A (en) * | 2019-08-19 | 2019-11-08 | 中国市政工程华北设计研究总院有限公司 | A kind of anoxic pond fining carbon source adds control system and progress control method |
| 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 |
| CN112266073A (en) * | 2020-10-12 | 2021-01-26 | 北京金控数据技术股份有限公司 | Intelligent control method and system for carbon source addition in sewage treatment |
| CN212712928U (en) * | 2020-07-31 | 2021-03-16 | 龙江环保集团股份有限公司 | Continuous sectional quantitative carbon source adding control system |
| CN112645536A (en) * | 2020-11-30 | 2021-04-13 | 重庆尚泽源环保科技有限公司 | Sewage treatment control method, device and system |
| CN113277685A (en) * | 2021-06-22 | 2021-08-20 | 哈尔滨工业大学（深圳） | AAO technology carbon source adding control system |
| CN113378098A (en) * | 2021-04-25 | 2021-09-10 | 北京北排水环境发展有限公司 | A2Method for calculating nitrogen and phosphorus removal operation effect of/O process |
-
2021
- 2021-12-27 CN CN202111619852.5A patent/CN114275876B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495321A (en) * | 2016-10-11 | 2017-03-15 | 美尚生化环境技术（上海）有限公司 | Biological tank process optimization and operation control system and its control method |
| CN108191052A (en) * | 2017-12-28 | 2018-06-22 | 北京中环嘉诚环境工程有限公司 | Carbon source Intelligent adding system for powered and its application in sewage disposal |
| CN109809560A (en) * | 2019-02-25 | 2019-05-28 | 北控水务(中国)投资有限公司 | A kind of accurate dosing control device of carbon source and method of multipoint water feeding multistage A/O technique |
| CN110422928A (en) * | 2019-08-19 | 2019-11-08 | 中国市政工程华北设计研究总院有限公司 | A kind of anoxic pond fining carbon source adds control system and progress control method |
| 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 |
| CN212712928U (en) * | 2020-07-31 | 2021-03-16 | 龙江环保集团股份有限公司 | Continuous sectional quantitative carbon source adding control system |
| CN112266073A (en) * | 2020-10-12 | 2021-01-26 | 北京金控数据技术股份有限公司 | Intelligent control method and system for carbon source addition in sewage treatment |
| CN112645536A (en) * | 2020-11-30 | 2021-04-13 | 重庆尚泽源环保科技有限公司 | Sewage treatment control method, device and system |
| CN113378098A (en) * | 2021-04-25 | 2021-09-10 | 北京北排水环境发展有限公司 | A2Method for calculating nitrogen and phosphorus removal operation effect of/O process |
| CN113277685A (en) * | 2021-06-22 | 2021-08-20 | 哈尔滨工业大学（深圳） | AAO technology carbon source adding control system |
Non-Patent Citations (1)
| Title |
|---|
| 王之晖, 王淑莹, 彭永臻, 高春娣: "前置反硝化脱氮系统外加碳源在线控制基础", 环境科学, no. 03, 30 May 2004 (2004-05-30) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482686A (en) * | 2019-03-26 | 2019-11-22 | 浙江海牛环境科技股份有限公司 | A kind of system and method proposing effect suitable for the consumption reduction of oxidation ditch biological denitrification |
| CN110482686B (en) * | 2019-03-26 | 2023-12-12 | 浙江海牛环境科技股份有限公司 | Consumption-reducing and efficiency-improving system and method suitable for biological denitrification of oxidation ditch |
| CN114790039A (en) * | 2022-05-27 | 2022-07-26 | 四川开泽环境科技有限公司 | Intelligent denitrification regulation and control method and system for aquaculture wastewater |
| CN115108644A (en) * | 2022-07-07 | 2022-09-27 | 迈邦（北京）环保工程有限公司 | Online nutrient dosing method, device, equipment and storage medium |
| CN115353200A (en) * | 2022-07-12 | 2022-11-18 | 苏州水星环保工业系统有限公司 | Sewage plant effluent TN intelligent control system and 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 |
| CN117985847B (en) * | 2023-06-21 | 2024-08-20 | 浙江数翰科技有限公司 | Intelligent carbon source adding method and system |
| CN119080211A (en) * | 2024-10-09 | 2024-12-06 | 深圳市盘龙环境技术有限公司 | A sewage system dosing device for VFAs prepared from food waste |
| CN119080211B (en) * | 2024-10-09 | 2025-05-16 | 深圳市盘龙环境技术有限公司 | Sewage system adding device for VFAs (vacuum distillation as) for kitchen waste preparation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114275876B (en) | 2024-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114275876B (en) | Accurate and intelligent carbon source adding control system and method | |
| CN110862188B (en) | Chemical phosphorus removal accurate dosing system and control method | |
| CN104298259A (en) | Carbon source addition feedforward-feedback control device and method | |
| CN104238527A (en) | Precise control method of sewage treatment plant aeration total quantity | |
| CN111470628B (en) | Carbon source medicament adding equipment and adding method | |
| CN112520822B (en) | Reagent feeding system and method for strengthening high-load operation of sewage treatment plant | |
| CN101759290A (en) | Device and method for rapidly realizing and stably maintaining shortcut nitrification in continuous flow process | |
| CN214167691U (en) | Sewage treatment plant fine management system | |
| CN114230110A (en) | Short-range intelligent phosphorus removal and dosing control method, equipment and system for sewage treatment | |
| CN113044973A (en) | Sewage treatment control system and effluent TN control method | |
| CN106277299A (en) | A kind of aeration control system based on oxygen consumption rate analyzer and method | |
| CN114538612A (en) | A kind of precise dosing system of external carbon source and control method thereof | |
| CN210855457U (en) | Aeration control system | |
| CN219342001U (en) | Device for controlling accurate dosing of sludge centrifugal dehydration | |
| Peng et al. | Use of pH as fuzzy control parameter for nitrification under different alkalinity in SBR process | |
| CN103910446A (en) | Method and device for modular programmed treatment of heavy metal waste liquid | |
| CN2883357Y (en) | A/O process denitrification process sewage treatment control device | |
| CN104355477A (en) | Chemical phosphorus removal automatic control device of sewage treatment plant and control method thereof | |
| CN212687861U (en) | Accurate dephosphorization medicine system of sewage treatment plant | |
| CN204097287U (en) | Sewage work's chemical dephosphorization automatic control device | |
| CN216584395U (en) | Carbon-adding denitrification control structure | |
| CN207780588U (en) | A kind of reconstituted tobacoo processing waste water treatment of pharmaceutical products addition control system | |
| CN218709754U (en) | Accurate dosing system of sewage treatment dephosphorization agent | |
| CN218709605U (en) | Carbon source dosing system | |
| CN216106230U (en) | Accurate aeration control device for sewage plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |