CN212425586U - Biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism - Google Patents
Biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism Download PDFInfo
- Publication number
- CN212425586U CN212425586U CN202020033176.8U CN202020033176U CN212425586U CN 212425586 U CN212425586 U CN 212425586U CN 202020033176 U CN202020033176 U CN 202020033176U CN 212425586 U CN212425586 U CN 212425586U
- Authority
- CN
- China
- Prior art keywords
- analyzer
- aeration
- control system
- biochemical
- denitrification
- 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.)
- Active
Links
Images
Abstract
The utility model discloses a biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism mainly is applied to low load of intaking, continuous flow municipal sewage treatment process, and control system includes: an on-line monitoring system, an aeration system and a PLC control system. And acquiring the water inlet data as a feedforward parameter and a biochemical on-way process parameter to obtain an optimal control strategy of the nitrification-denitrification state. The system reduces the power consumption and the material consumption of low carbon source addition under the condition of low water inflow load and low C/N, and simultaneously ensures COD and NH3-N and TN are removed. The utility model has wide application range, simple and easy operation, and is suitable for sewage treatment plants of various scales; the difficulty of the transformation is small,the energy-saving and consumption-reducing benefits are remarkable, and large energy-saving and consumption-reducing benefits can be obtained through small transformation according to the automatic control conditions of the water plant.
Description
Technical Field
The utility model relates to a low carbon municipal sewage treatment and energy-saving control field specifically are biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism, in particular to sewage treatment energy-saving control technique under the continuous flow treatment process.
Background
Water and energy are two basic resources of modern society, and sewage treatment is an important means for realizing water resource recycling. However, the urban sewage treatment is an industry with high energy consumption, and the energy consumption mainly comprises multiple aspects of electric energy, medicine consumption, fuel and the like, wherein the electric energy consumption accounts for about 60-90% of the total energy consumption. The construction of sewage treatment at the present stage, the lack of municipal pipe networks and the subsequent upgrading and reconstruction projects often neglect the composition and the change of the quality of the inlet water, so that the process adjustment at the later stage is difficult, the operation energy consumption is high, and the stable standard reaching of the outlet water is influenced. Under the increasingly strict requirements of discharge standards, sewage treatment plants adopt various ways to improve the operation level and the management and control capacity. But is limited to various difficulties, and the effluent quality reaches the standard by adopting a simpler and extensive mode in quantity at present. For example, COD and NH in effluent3the-N reaches the standard, generally, a mode of increasing aeration air volume is simply adopted, and sometimes, the denitrification process can be damaged to cause poor TN of the effluent. For TN reaching the standard, carbon source agents (sodium acetate, glucose and the like) are generally added in a biochemical section, so that the cost of a large amount of agents is increased. For these problems, the idea of system diagnosis and treatment is urgently needed, and the optimization of the operation conditions is considered from the whole link of biological nitrogen and phosphorus removal.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism utilizes data simulation analysis to aassessment sewage plant process parameter and equipment state to low C/N, continuous flow sewage treatment plant, establishes "ammonia nitrogen-nitrate nitrogen" and biochemical energy-saving control expert system who needs between the tolerance, technology operation. Aims to provide precise control of the aeration process for biological treatment and realize air supply according to requirements.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a biochemical oxygen demand control system based on synchronous nitrification-denitrification mechanism which characterized in that, includes on-line monitoring system, aeration system and PLC control system, wherein:
the on-line monitoring system comprises a COD analyzer and NH3-N analyzer, NO3-an N analyzer, a DO meter, a pH meter, a temperature meter, an MLSS analyzer and an influent water flow meter; wherein, COD analyzer, NH3the-N analyzers are respectively arranged at the water inlet end of the biochemical system, the front end, the middle end and the tail end of the aerobic tank, and NH3-N analyzer, NO3The N analyzer and the DO measuring instrument are respectively arranged at the front end, the middle end and the tail end of the aerobic tank; the pH measuring instrument, the temperature measuring instrument and the MLSS analyzer are arranged at the middle section of the aerobic tank; the water inlet flow measuring instrument is arranged at the water inlet end; each instrument of the on-line monitoring system is electrically connected with the PLC control system;
the aeration system comprises a blower, an aeration pipeline and an automatic aeration control valve; the blower is connected with the aeration pipeline, the tail end of the aeration branch pipe is provided with an automatic aeration control valve, and the blower and the automatic aeration control valve are electrically connected with the PLC control system;
the blower is a variable frequency blower; the inner reflux pump and the outer reflux pump adopt variable frequency pumps;
the utility model also provides a biochemical oxygen demand control method based on synchronous nitrification and denitrification mechanism, its characterized in that: a biochemical oxygen Demand (DO) prediction model of a sewage treatment system developed based on synchronous nitrification and denitrification biochemical reactions utilizes a neural network algorithm and adopts a water inlet COD analyzer and NH3-N analyzer and inflow (Q) meter online monitoring data as feed forward parameters, calculating formula:
in the formula: q, COD, NH3N is respectively inflow, COD concentration and NH3Concentration of-N, A1To A3，B1To B3，C1To C3For biochemical reaction kinetic coefficients, respectively corresponding to: the rate constant of bacteriolysis and attenuation, the maximum growth rate based on the substrate, the growth saturation/inhibition coefficient of the easily biodegradable substrate, the heterotrophic bacteria yield coefficient, the heterotrophic bacteria attenuation coefficient, the maximum specific growth rate of nitrobacteria, the maximum specific growth rate of phosphorus-accumulating bacteria, the maximum growth rate of autotrophic bacteria and the autotrophic bacteria saturation coefficient of ammonia nitrogen, and the reaction parameters at all levels are adjusted according to the pH value, MLSS value and temperature in the biochemical pool.
Further, a sewage treatment system biochemical oxygen Demand (DO) prediction model developed based on synchronous nitrification and denitrification biochemical reaction adopts an aerobic zone on-way COD analyzer and NH3-N analyzer, NO3-N analyzer and DO meter online monitoring data as process parameters; to f0(DO) the resulting BOD is corrected to yield f (DO).
Further, according to the corrected biochemical oxygen demand f (DO) and the oxygen supply amount (N, the lowest-frequency oxygen supply amount) of the aeration fan, the start-stop or frequency of the air blower is adjusted through a PLC control system, or the opening degree of an automatic aeration control valve is adjusted, the dissolved oxygen state in the biochemical aerobic tank is alternately regulated and controlled in time or space, and the optimization strategy is as follows:
the dissolved oxygen state in the biochemical aerobic tank is divided into a nitrification state and a denitrification state, wherein the dissolved oxygen in the aerobic tank is controlled to be 1-1.5 mg/L during the nitrification state, and the dissolved oxygen in the aerobic tank is controlled to be less than 0.3mg/L during the denitrification state.
Compared with the prior art, the beneficial effects of the utility model are that: (1) when the aerobic tank runs in a low DO nitrification state, the mean dissolved oxygen in the aerobic tank is controlled to be 0.5-1 mg/L, and when the dissolved oxygen environment reaches balance (nitrate and nitrite generated by nitrification reaction can be utilized by denitrification in an anoxic environment right), the aeration power consumption is reduced by more than 30%. (2) The denitrification function of the internal carbon source can be exerted, macromolecular organic pollutants are adsorbed on the surface of cells and are converted into soluble organic matters capable of being transferred into cells through the extracellular enzymatic hydrolysis, the organic pollutants are used as the internal carbon source to provide energy and carbon sources for the denitrification reaction, and the external carbon source can be reduced by 50-80%. (3) The utility model has wide application range, simple and easy operation, and is suitable for sewage treatment plants of various scales; the transformation difficulty is small, the energy-saving and consumption-reducing benefits are high, and large energy-saving and consumption-reducing benefits can be obtained through small transformation according to the automatic control conditions of the water plant.
Drawings
Fig. 1 is a schematic view of an aeration control system provided by an embodiment of the present invention.
In the figure: 1. COD Analyzer, 2, one NH3-N analyzer, 3, NO3-N analyzer, 4, DO meter, 5, pH meter, 6, temperature meter, 7, MLSS analyzer, 8, aeration automatic control valve, 9, inflow meter, 10, blower, 11, aeration line, 12, external reflux line, 13, internal reflux line, 14, external reflux pump, 15, internal reflux pump, 16, PLC control system.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples of the specification.
The embodiment provides an aeration control system and method, and the applied process running conditions are as follows: in a certain town sewage treatment plant, the treatment scale is 1 ten thousand tons per day, and the core process adopts an improvement A2The O process requires that the effluent reaches the first grade A standard of the national discharge standard; the biochemical system is divided into two series, and each series of aerobic tanks is divided into two aeration galleries.
As shown in figure 1, the aeration control system is provided with an online monitoring system. A COD analyzer (1) and an NH are arranged at the water inlet of the biochemical system3-N analyzer (2), inflow meter (9). Biochemical aerobic tankThe front, middle and tail ends are respectively provided with a COD analyzer (1) and NH3-N analyzer (2), NO3-an N analyzer (3), a DO meter (4) recording on-the-way water quality data; meanwhile, a pH measuring instrument (5), a temperature measuring instrument (6) and an MLSS analyzer (7) are arranged at the middle end of the aerobic tank, and sludge in the biochemical system and biochemical reaction states are recorded. And each instrument of the on-line monitoring system is electrically connected with the PLC control system (16).
An aeration control system, provided with an aeration system thereon, comprising: the automatic aeration control system comprises an air blower (10), an aeration pipeline (11) and an automatic aeration control valve (8), wherein the automatic aeration control valve (8) is arranged on the aeration pipeline (11), and the air blower (10) and the automatic aeration control valve (8) are electrically connected with a PLC (programmable logic controller) control system (16).
An aeration control system having a recirculation system disposed thereon comprising: an internal reflux system and an external reflux system; the internal reflux system comprises: an internal return pump (14) and an internal return line (13); the external reflux system comprises: an external reflux pump (15) and an external reflux pipeline (12); the inner reflux pump (14) and the outer reflux pump (15) are electrically connected with the PLC control system (16) and used for controlling the reflux quantity of the nitrifying liquid and the reflux quantity of the sludge.
A biochemical oxygen Demand (DO) prediction model of a sewage treatment system developed based on synchronous nitrification and denitrification biochemical reactions utilizes a neural network algorithm and a COD analyzer (1) and NH at the water inlet of the biochemical system3The data collected by the N analyzer (2) and the inflow water flow meter (9) are used as feedforward information and transmitted to a data processing unit of a PLC (programmable logic controller) control system (18) for analysis to obtain feedforward biochemical oxygen demand f0(DO). Then respectively arranging a COD analyzer (1) and NH according to the front end, the middle end and the tail end of the biochemical aerobic tank (17) along the way3-N analyzer (2), NO3The on-way data collected by the N analyzer (3) and the DO measuring instrument (4) are used as process parameters and transmitted to a PLC control system (16) data processing unit, and f is processed0(DO) the resulting BOD is corrected to yield f (DO). Data collected by the pH measuring instrument (5), the temperature measuring instrument (6) and the MLSS analyzer (7) are used as the basis for adjusting the reaction coefficient of the model matrix.
According to the corrected biochemical oxygen demand f (DO) and a corresponding optimization control strategy, a PLC control system is used for regulating the opening and closing of an air blower (10) and switching an automatic aeration control valve (8), so that the dissolved oxygen state in the biochemical aerobic tank is subjected to time alternative regulation and control and is divided into a nitrification state and a denitrification state, the time interval between the nitrification state and the denitrification state is 4 hours, namely the denitrification state is started for 4 hours after 4 hours of the nitrification state; wherein the dissolved oxygen in the aerobic tank is controlled to be 1-1.5 mg/L during the nitrification state, and the dissolved oxygen in the aerobic tank is controlled to be less than 0.3mg/L during the denitrification state.
The water quality information of inlet water is collected and analyzed by a PLC control system (16), and the COD of the outlet water quality is reduced from 19.2mg/L to 18.7mg/L and NH is carried out by high-efficiency aeration for 2 months3The N is basically and stably kept at 0.53-0.59 mg/L, and the TN is reduced from 15.3mg/L to 12.5 mg/L; compared with the average energy consumption of ton water in the time range of two months before and after the implementation, the ton water average energy consumption is reduced from 0.62kWh/t water to 0.53kWh/t water by 14.5 percent.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. The utility model provides a biochemical oxygen demand control system based on synchronous nitrification-denitrification mechanism which characterized in that, includes on-line monitoring system, aeration system and PLC control system, wherein:
the on-line monitoring system comprises a COD analyzer and NH3-N analyzer, NO3-an N analyzer, a DO meter, a pH meter, a temperature meter, an MLSS analyzer and an influent water flow meter; wherein, COD analyzer, NH3the-N analyzers are respectively arranged at the water inlet end of the biochemical system, the front end, the middle end and the tail end of the aerobic tank, and NH3-N analyzer, NO3The N analyzer and the DO measuring instrument are respectively arranged at the front end, the middle end and the tail end of the aerobic tank; the pH measuring instrument, the temperature measuring instrument and the MLSS analyzer are arranged at the middle section of the aerobic tank; the water inlet flow measuring instrument is arranged at the water inlet end; each instrument of the on-line monitoring system is electrically connected with the PLC control systemConnecting;
the aeration system comprises a blower, an aeration pipeline and an automatic aeration control valve; the air blower is connected with the aeration pipeline, the tail end of the aeration branch pipe is provided with an automatic aeration control valve, and the air blower and the automatic aeration control valve are electrically connected with the PLC control system.
2. The biochemical aerobic control system based on the synchronous nitrification and denitrification mechanism according to claim 1, wherein the blower is a variable frequency blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020033176.8U CN212425586U (en) | 2020-01-08 | 2020-01-08 | Biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020033176.8U CN212425586U (en) | 2020-01-08 | 2020-01-08 | Biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212425586U true CN212425586U (en) | 2021-01-29 |
Family
ID=74277174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020033176.8U Active CN212425586U (en) | 2020-01-08 | 2020-01-08 | Biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212425586U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111087073A (en) * | 2020-01-08 | 2020-05-01 | 北控水务(中国)投资有限公司 | Sewage treatment biochemical aerobic control system and method based on synchronous nitrification and denitrification mechanism |
-
2020
- 2020-01-08 CN CN202020033176.8U patent/CN212425586U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111087073A (en) * | 2020-01-08 | 2020-05-01 | 北控水务(中国)投资有限公司 | Sewage treatment biochemical aerobic control system and method based on synchronous nitrification and denitrification mechanism |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111847634A (en) | Aeration and carbon source adding optimization control system and method for sludge-membrane composite sewage treatment process | |
| CN101439915B (en) | Membrane aeration biomembrane process and apparatus for sewerage short-cut denitrification | |
| CN113023881B (en) | Aeration quantity and internal reflux quantity optimal control system and method based on MABR (moving average aeration ratio) process | |
| CN100486913C (en) | Front denitrification sewage treater, treatment, its automatic controller and control thereof | |
| CN108640278B (en) | Low C/N ratio urban domestic sewage endogenous denitrification dephosphorization/shortcut nitrification partial anaerobic ammonia oxidation biomembrane process and device | |
| CN104962505A (en) | Immobilized nitrobacteria enrichment culture method and device in sewage treatment process | |
| Sklyar et al. | Combined biologic (anaerobic-aerobic) and chemical treatment of starch industry wastewater | |
| CN108408897A (en) | The intermittent aerating real-time control method of integrated short distance nitration Anammox dephosphorization simultaneously | |
| CN112607861A (en) | Process for treating municipal sewage by using excess sludge fermentation carbon source to strengthen denitrification dephosphorization, partial short-cut denitrification and anaerobic ammonia oxidation | |
| CN110078213B (en) | Device and method for strengthening stable operation of anaerobic ammonia oxidation treatment of municipal sewage by SBR/anaerobic baffle reactor | |
| CN111087073A (en) | Sewage treatment biochemical aerobic control system and method based on synchronous nitrification and denitrification mechanism | |
| CN103601294B (en) | Method and system for realization of autotrophic nitrogen removal of micro polluted water | |
| CN113023889B (en) | Carbon source adding optimization control system and method for AOA + MABR coupling process | |
| CN212425586U (en) | Biochemical oxygen demand control system based on synchronous nitrification and denitrification mechanism | |
| CN216141333U (en) | Carbon source adding optimization control system of AOA + MABR coupling process | |
| CN106542636A (en) | A kind of method of quick startup whole process autotrophic denitrification | |
| CN102198978A (en) | Apparatus for realizing short-cut nitrification by membrane bioreactor and method thereof | |
| CN116589096A (en) | Multi-mode AAO-MBR (anaerobic-anoxic-oxic-Membrane biological reactor) technical process control system and method | |
| CN114804326B (en) | Control method and system for high-efficiency denitrification and dephosphorization of short-cut nitrification and denitrification reaction tank | |
| CN215006353U (en) | Aeration quantity and internal reflux quantity optimal control system based on MABR (moving average aeration ratio) process | |
| CN114229995B (en) | System and process for synchronous denitrification and decarbonization of pig raising wastewater | |
| CN216997850U (en) | Carbon source adding device for AAO process sewage treatment | |
| CN114538538A (en) | Total nitrogen control system and method for sewage plant | |
| CN110436642B (en) | Process for enhancing nitrogen and phosphorus removal of municipal domestic sewage by laterally treating and enriching glycan bacteria | |
| CN114314838A (en) | Formic acid inhibition type semi-shortcut nitrification coupled sulfenyl autotrophic nitrogen removal process device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |