CN211111272U - Refined carbon source adding control system of anoxic tank - Google Patents
Refined carbon source adding control system of anoxic tank Download PDFInfo
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- CN211111272U CN211111272U CN201921344145.8U CN201921344145U CN211111272U CN 211111272 U CN211111272 U CN 211111272U CN 201921344145 U CN201921344145 U CN 201921344145U CN 211111272 U CN211111272 U CN 211111272U
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Abstract
The utility model relates to an oxygen deficiency pond carbon source that becomes more meticulous throws feed control system belongs to sewage treatment technical field. The utility model discloses change traditional oxygen deficiency pond carbon source and throw control system design, mainly through the design of oxygen deficiency district subregion, first oxygen deficiency district end sets up online nitrate nitrogen appearance, the import of second oxygen deficiency district sets up the carbon source and throws the design that becomes more meticulous such as with the point of adding and the scientific certainty of carbon source throw volume computational formula, can solve the carbon source that current oxygen deficiency pond carbon source is thrown control system and is lacked the design that becomes more meticulous and lead to and throw excessively with, the carbon source utilization ratio is low, the carbon source is thrown with high costs, crowd and account for the good oxygen pond holding, it is big that the risk that exceeds standard to go out water, operation problems such. Compare with current carbon source throwing control system, the utility model has the advantages of the construction investment is low, the operation control method is simple, the carbon source utilization ratio of intaking is high, outer carbon source is lossless, the carbon source is thrown the dosage accuracy, the carbon source is thrown and is thrown with low costs, the play water risk that exceeds standard is low, do not receive intake quality of water fluctuation influence.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to oxygen deficiency pond carbon source that becomes more meticulous throws control system.
Background
Since the outbreak of blue-green algae in Taihu lake in 2007, national first-class A emission standards (GB 18918-2002) executed by urban sewage treatment plants in China gradually develop from Taihu lake basin to China, the requirements on effluent TN (Total Nitrogen) are severer (the TN concentration limit value is 15 mg/L), in recent years, local emission standards which are stricter than the national first-class A standards are issued and implemented in succession in Beijing, Tianjin, and compound fertilizers for further controlling water pollution, such as Tianjin landmark A standard (DB 12/599-.
At present, the carbon source adding control modes of the anoxic pond of the urban sewage treatment plant in China mainly comprise a manual control mode, wherein an operation manager mainly performs manual control on the adding amount of a carbon source according to the change trend of the outlet water TN concentration of a biological system or the change of the inlet water quality (COD, BOD, TN and carbon-nitrogen ratio), the adding amount of the carbon source is usually constant within a period of time, for example, when the outlet water TN concentration of the biological system is increased, the adding amount of the carbon source is increased, when the inlet water quality becomes weak in rainy season, the adding amount of the carbon source is reduced on the premise of ensuring the stability and the standard of the outlet water TN, and the other mode is a carbon source adding control mode based on feedforward-feedback, wherein the adding amount of the carbon source is automatically controlled by a P L C controller through the combination of feedforward and feedback through an online measuring instrument for the relevant indexes of the inlet water quality (COD, TN, ammonia nitrogen and the like) and an online measuring instrument for the relevant indexes of the.
As for the artificial carbon source adding control mode, due to the influence of the fluctuation of the quality and the quantity of inlet water, the excessive or insufficient adding of the carbon source is usually easy to cause, the insufficient adding of the carbon source can cause that the TN (total nitrogen) of outlet water can not stably reach the standard, the excessive adding of the carbon source can cause the waste of the carbon source, the high adding cost of the carbon source, the increase of aeration quantity, the extrusion of the tank capacity of an aerobic tank, the excessive risk of ammonia nitrogen in the outlet water and the like. Taking a sewage treatment plant with a certain high discharge standard in a sea river basin as an example, the method adopts a mode of manually controlling carbon source adding, and because the carbon source is excessively added in an anoxic tank, the carbon source adding waste and the aeration energy consumption are increased, and about one fifth of tank capacity of a subsequent aerobic tank is extruded, so that the risk of exceeding the ammonia nitrogen of effluent of the system is increased.
For the carbon source adding control mode based on feedforward-feedback, the determination of the carbon source adding amount is mainly based on the water inlet related water quality indexes (COD, TN, ammonia nitrogen and the like), the determined carbon source adding amount is not accurate due to the fluctuation of the water inlet biochemical B/C ratio, the water inlet available carbon source amount determined based on the B/C ratio in a certain time is not accurate, and the feedback has certain hysteresis, so that the determined carbon source adding amount is not accurate, the problem of excessive or insufficient carbon source adding amount in an anoxic tank is further caused, and the operation control method of the carbon source adding control system is complex, so that the stable standard reaching of a high-emission standard urban sewage treatment plant and the energy saving and consumption reduction are not facilitated.
In order to solve the operation problems of the existing carbon source adding control system, the proposal of the refined carbon source adding control system has important practical significance for reaching the standard stably and saving energy and reducing consumption of the high-emission standard urban sewage treatment plant.
Disclosure of Invention
The utility model aims to solve the technical problem that aiming at the defects of the prior art, the refined carbon source adding control system of an anoxic tank and the operation control method thereof are provided, the refined design of the refined carbon source adding control system of the anoxic tank is mainly embodied in that the first anoxic zone is designed in a sub-zone way in ①, the anoxic zone is divided into a first anoxic zone (the design HRT is 3-5 h) and a second anoxic zone (the design HRT is 1-2 h), the first anoxic zone utilizes an influent carbon source to perform denitrification, the second anoxic zone mainly utilizes an external carbon source to perform enhanced denitrification, ② carbon source adding points are arranged at the inlet end of the second anoxic zone, the tail end of the first anoxic zone is provided with an online nitrate nitrogen instrument, the displayed real-time nitrate nitrogen concentration is input into a carbon source accurate adding controller, the carbon source adding amount is determined as a key parameter of the external carbon source adding amount of the second anoxic zone, the effluent end of the second settling basin is provided with an online total nitrogen instrument, the effluent water outlet end of the second settling basin is provided with an online total carbon source adding amount, the water outlet end of the online total nitrogen instrument, the water outlet end of the carbon source is provided with a formula, the water quality of the added water source adding amount is calculated, the added into the formula, the water quality of the water is calculated, the water quality of the water is not influenced by the practical water quality control, the practical water adding cost is increased, and the water quality.
In order to solve the technical problem, the utility model discloses a technical scheme is: a refined carbon source adding control system of an anoxic pond and an operation control method thereof are characterized in that the carbon source adding control system and the operation control method thereof have the following characteristics:
a refined carbon source adding control system of an anoxic tank, which comprises a first anoxic zone, a second anoxic zone, an aerobic zone and a secondary sedimentation tank, wherein an outlet of the first anoxic zone is connected with an inlet of the second anoxic zone, an outlet of the second anoxic zone is connected with an inlet of the aerobic zone, an outlet of the aerobic zone is connected with an inlet of the secondary sedimentation tank, and the refined carbon source adding control system also comprises a carbon source precise adding controller, the inlet end and the outlet end of the first anoxic zone are respectively provided with a mixed liquid internal reflux system and an online nitrating instrument, the inlet end of the second anoxic zone is provided with a carbon source adding system, the bottom and the water outlet end of the secondary sedimentation tank are respectively provided with a sludge reflux system and an online total nitrating instrument, the accurate carbon source adding controller is respectively connected with the online nitrate nitrogen instrument, the online total nitrogen instrument, the third online biological system water inlet flowmeter, the first online mixed liquid return system flowmeter, the second online sludge return system flowmeter and the carbon source adding pump of the carbon source adding system through signal lines.
The hydraulic retention time of the first anoxic zone and the second anoxic zone is 3-5 hours and 1-2 hours respectively, wherein the first anoxic zone utilizes a water inlet carbon source to perform denitrification, and the second anoxic zone mainly utilizes an external carbon source to perform enhanced denitrification.
The real-time nitrate nitrogen concentration displayed by an online nitrate nitrogen instrument arranged at the outlet end of the first anoxic zone is a key parameter for determining the carbon source adding amount of a carbon source adding system.
The pool type of the first anoxic zone and the second anoxic zone is a circular ditch type, a plug flow type or a complete mixing type.
The internal reflux point of the mixed liquid internal reflux system is only arranged at the inlet end of the first anoxic zone.
The mixed liquid internal reflux system and the sludge reflux system both adopt variable frequency pumps, and a carbon source adding pump of the carbon source adding system adopts a variable frequency diaphragm metering pump.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses an anoxic zone subregion design (be divided into first anoxic zone and second anoxic zone), first anoxic zone end sets up online nitrate nitrogen appearance, second anoxic zone import sets up the carbon source and throws with the point, two heavy pond outlet ends set up the scientific certainty that design and real-time carbon source that become more meticulous such as online total nitrogen appearance throw with the volume, can solve current high emission standard sewage treatment plant anoxic tank carbon source addition system and lack the carbon source that design that becomes more meticulous leads to and throw with excessively, the carbon source low-usage, the carbon source is thrown with high costs, crowd and account for good oxygen pond appearance, it is big to go out the water risk that exceeds standard, increase actual motion problems such as aeration energy consumption. Compared with the existing carbon source adding system, the utility model has the advantages of low construction investment, simple operation control method, high utilization rate of the carbon source of water inlet, no loss of the outer carbon source, accurate carbon source adding amount, obvious reduction of carbon source adding cost, low risk of exceeding the standard of water outlet, no influence of fluctuation of the water quality of water inlet and the like.
2. Through the oxygen deficiency zone partition design, the online nitrate nitrogen instrument is arranged at the tail end of the first oxygen deficiency zone, the real-time nitrate nitrogen concentration displayed by the online nitrate nitrogen instrument is used as a key parameter for determining the carbon source adding amount of the second oxygen deficiency tank, and meanwhile, the real-time total nitrogen concentration of effluent of the secondary sedimentation tank is combined with the difference value of the set total nitrogen control value, so that the real-time carbon source adding amount of the oxygen deficiency tank can be scientifically determined, the problem of excessive adding of the carbon source is effectively avoided, and the adding amount and adding cost of the external carbon source are remarkably reduced while the effluent of a high-emission standard sewage treatment plant is guaranteed to stably reach the.
3. Through the design of anoxic zone partitions, wherein the first anoxic zone utilizes a water carbon source to carry out denitrification, the second anoxic zone mainly utilizes an external carbon source to carry out enhanced denitrification, and only the first anoxic zone is provided with a return point in the mixed liquid, so that the full utilization of the water carbon source is facilitated, and the problem of ineffective loss of the external carbon source of the anoxic tank caused by dissolved oxygen carried by return flow in the mixed liquid can be avoided.
4. The on-line nitrometer is arranged at the tail end of the first anoxic zone, so that key parameter support can be provided for rapidly and scientifically determining the enhanced denitrification amount and the carbon source adding amount of the anoxic tank, and the real-time regulation and control of the reflux amount of the reflux system in the mixed liquid can be guided by combining the difference value of the on-line total nitrogen meter of the effluent of the secondary sedimentation tank and the set total nitrogen control value, so that the power consumption of the internal reflux system is reduced.
5. The real-time carbon source adding amount calculation formula determined based on the refined design does not relate to the influent water quality parameters (COD, BOD, TN and the like) of the biological tank, mainly relates to the nitrate nitrogen concentration at the tail end of the first anoxic zone, the total effluent nitrogen concentration of the secondary sedimentation tank, the internal reflux ratio and the external reflux ratio, is not influenced by the fluctuation of the influent water quality, and is favorable for the stable standard reaching of effluent and the energy conservation and consumption reduction of a sewage treatment system.
To sum up, the utility model discloses pertinence, practicality and maneuverability are strong, can provide reference for the design that becomes more meticulous and the operation of town sewage treatment plant under the high emission standard of china, and it is significant to stable up to standard and energy saving and consumption reduction of low carbon nitrogen ratio, high emission standard sewage treatment plant.
Drawings
FIG. 1 shows the structure of the refined carbon source adding control system of the anoxic tank.
Description of reference numerals: 1-a first anoxic zone; 2-a second anoxic zone; 3-an aerobic zone; 4-secondary sedimentation tank; 5-mixed liquid internal reflux system; 6-a first in-line flow meter; 7-an online nitrate nitrogen instrument arranged at the tail end of the first anoxic zone; 8-a carbon source adding system; 9-carbon source feeding pump; 10-a sludge recirculation system; 11-a second in-line flow meter; 12-an online total nitrogen instrument arranged at the water outlet end of the secondary sedimentation tank; 13-a third in-line flow meter; 14-accurate carbon source adding controller.
Detailed Description
Example 1
As shown in figure 1, a refined carbon source adding control system of an anoxic tank comprises a first anoxic zone 1, a second anoxic zone 2, an aerobic zone 3 and a secondary sedimentation tank 4, wherein an outlet of the first anoxic zone 1 is connected with an inlet of the second anoxic zone 2, an outlet of the second anoxic zone 2 is connected with an inlet of the aerobic zone 3, an outlet of the aerobic zone 3 is connected with an inlet of the secondary sedimentation tank 4, the refined carbon source adding controller 14 is further comprised, an inlet end and an outlet end of the first anoxic zone 1 are respectively provided with a mixed liquid internal reflux system 5 and an online nitrator 7, an inlet end of the second anoxic zone 2 is provided with a carbon source adding system 8, a bottom and an outlet end of the secondary sedimentation tank 4 are respectively provided with a sludge reflux system 10 and an online total nitrogen meter 12, the refined carbon source adding controller 14 is respectively connected with the online nitrator 7, the online total nitrogen meter 12, a third online flowmeter 13, a third online nitrator 13 and a third online nitrator 12 of biological system water inlet through signal lines, The first online flowmeter 6 of the mixed liquid internal reflux system, the second online flowmeter 11 of the sludge reflux system and the carbon source adding pump 9 of the carbon source adding system 8 are connected.
The designed hydraulic retention time of the first anoxic zone 1 and the second anoxic zone 2 is 5h and 2h respectively, wherein the first anoxic zone 1 utilizes a water inlet carbon source to perform denitrification, and the second anoxic zone 2 mainly utilizes an external carbon source to perform enhanced denitrification.
The real-time nitrate nitrogen concentration displayed by an online nitrate nitrogen instrument 7 arranged at the outlet end of the first anoxic zone 1 is a key parameter for determining the carbon source adding amount of a carbon source adding system 8.
The pool type of the first anoxic zone 1 and the second anoxic zone 2 is a circular groove type.
The internal reflux point of the mixed liquid internal reflux system 5 is only arranged at the inlet end of the first anoxic zone 1.
The mixed liquid internal reflux system 5 and the sludge reflux system 10 both adopt variable frequency pumps, and the carbon source adding pump 9 of the carbon source adding system 8 adopts a variable frequency diaphragm metering pump, so that the real-time regulation and control of the reflux amount and the carbon source adding amount are facilitated.
The carbon source added by the carbon source adding system 8 is sodium acetate.
The operation control method of the refined carbon source adding control system of the anoxic tank comprises the following steps:
(1) setting the total nitrogen control value of effluent of the secondary sedimentation tank as A according to the discharge standard to be executedTNmg/L, and ATNA total nitrogen concentration limit value TN less than an implementation standard;
(2) determining a carbon source adding amount calculation formula for calculating the real-time carbon source adding amount of the anoxic tank by using the accurate carbon source adding controller:
when C is presentTN<ATNThe adding amount of the real-time carbon source required by the enhanced denitrification of the anoxic pond is S = 4 × △ TN = 4 × CNitro nitrogen* (r+R+1)－(ATN-CTN)]mg/L COD；
When C is presentTN≥ATNThe adding amount of the real-time carbon source required by the enhanced denitrification of the anoxic pond is S = 4 × △ TN = 4 × CNitro nitrogen*(r+R+1)mg/L COD；
Wherein △ TN is the intensified denitrogenation quantity actually needed by the anoxic tank, CNitro nitrogenReal-time nitrate nitrogen concentration displayed by an online nitrate nitrogen instrument arranged at the tail end of the first anoxic zone; r is internal reflux ratio, namely real-time internal reflux quantity Q displayed by an online flowmeter arranged in a mixed liquid internal reflux systemrReal-time water inflow Q displayed by online flowmeter for water inflow of biological systemInflow waterRatio Q ofr/QInflow water(ii) a R is external reflux ratio, namely real-time external reflux quantity Q displayed by an online flowmeter arranged in the sludge reflux systemRReal-time water inflow Q displayed by online flowmeter for water inflow of biological systemInflow waterRatio Q ofR/QInflow water；CTNThe real-time total nitrogen concentration of the effluent of the secondary sedimentation tank is displayed by an online total nitrogen instrument arranged at the effluent end of the secondary sedimentation tank;
(3) c in step (2)Nitro nitrogen、QInflow water、Qr、QRAnd CTNThe carbon source accurate adding controller is input in real time through a signal line and calculates the carbon source adding amount according to the set carbon source adding amountCalculating and determining the real-time carbon source adding amount S;
(4) the accurate carbon source adding controller combines the real-time input water inflow Q of the biological system according to the calculation result of the real-time carbon source adding amount SInflow waterAnd a carbon source adding pump of the carbon source adding system is instructed through a signal line to regulate and control the adding flow of the carbon source.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes made to the above embodiments according to the utility model all still belong to the protection scope of the technical scheme of the utility model.
Claims (6)
1. The refined carbon source adding control system of the anoxic tank comprises a first anoxic zone (1), a second anoxic zone (2), an aerobic zone (3) and a secondary sedimentation tank (4), wherein an outlet of the first anoxic zone (1) is connected with an inlet of the second anoxic zone (2), an outlet of the second anoxic zone (2) is connected with an inlet of the aerobic zone (3), an outlet of the aerobic zone (3) is connected with an inlet of the secondary sedimentation tank (4), the refined carbon source adding control system is characterized by further comprising a carbon source accurate adding controller (14), an inlet end and an outlet end of the first anoxic zone (1) are respectively provided with a mixed liquid internal reflux system (5) and an online nitrate nitrogen instrument (7), an inlet end of the second anoxic zone (2) is provided with a carbon source adding system (8), a bottom and a water outlet end of the secondary sedimentation tank (4) are respectively provided with a sludge reflux system (10) and an online total nitrogen instrument (12), and the carbon source accurate carbon source adding controller (14) is respectively connected with the online nitrate nitrogen instrument (7) through signal lines, An online total nitrogen meter (12), a third online flowmeter (13) for the biological system water inlet, a first online flowmeter (6) for the mixed liquid internal reflux system, a second online flowmeter (11) for the sludge reflux system and a carbon source adding pump (9) for the carbon source adding system (8) are connected.
2. The carbon source refining and adding control system of the anoxic tank as claimed in claim 1, wherein the designed hydraulic retention time of the first anoxic zone (1) and the second anoxic zone (2) is 3-5h and 1-2h respectively, wherein the first anoxic zone (1) utilizes an influent carbon source to perform denitrification, and the second anoxic zone (2) mainly utilizes an external carbon source to perform enhanced denitrification.
3. The carbon source refining and adding control system of the anoxic tank as claimed in claim 1, wherein the real-time nitrate nitrogen concentration displayed by an online nitrate nitrogen instrument (7) arranged at the outlet end of the first anoxic zone (1) is a key parameter for determining the carbon source adding amount of the carbon source adding system (8).
4. The carbon source refining and adding control system of the anoxic tank as claimed in claim 1, wherein the tank type of the first anoxic zone (1) and the second anoxic zone (2) is a circular ditch type, a plug flow type or a complete mixing type.
5. The carbon source refining and adding control system of the anoxic tank as claimed in claim 1, wherein the internal reflux point of the mixed liquor internal reflux system (5) is only arranged at the inlet end of the first anoxic zone (1).
6. The oxygen-poor pool refined carbon source adding control system as claimed in claim 1, wherein the mixed liquid internal reflux system (5) and the sludge reflux system (10) both adopt variable frequency pumps, and the carbon source adding pump (9) of the carbon source adding system (8) adopts a variable frequency diaphragm metering pump.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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2019
- 2019-08-19 CN CN201921344145.8U patent/CN211111272U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110422928B (en) * | 2019-08-19 | 2024-01-12 | 中国市政工程华北设计研究总院有限公司 | Refined carbon source adding control system and operation control method for anoxic tank |
| 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 |
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