CN112875859A - Sewage nitrogen and phosphorus removal control system based on AOA technology - Google Patents
Sewage nitrogen and phosphorus removal control system based on AOA technology Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 44
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 26
- 239000011574 phosphorus Substances 0.000 title claims abstract description 26
- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 22
- 238000005516 engineering process Methods 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000004062 sedimentation Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims abstract description 24
- 239000010802 sludge Substances 0.000 claims description 63
- 238000010992 reflux Methods 0.000 claims description 22
- 238000005273 aeration Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 230000003851 biochemical process Effects 0.000 description 3
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- 230000008878 coupling Effects 0.000 description 3
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 208000037534 Progressive hemifacial atrophy Diseases 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 2
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- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 238000012017 passive hemagglutination assay Methods 0.000 description 2
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
A sewage denitrification and dephosphorization control system based on AOA process relates to the technical field of urban sewage treatment, and comprises: the data acquisition and processing module is used for acquiring and processing data in the biochemical pool and/or the sedimentation pool; the control module is used for comparing the data transmitted by the data acquisition and processing module with a plurality of preset data intervals and further sending a control instruction corresponding to the data falling into a certain data interval; the dissolved oxygen control module is used for receiving the control instruction and adjusting the dissolved oxygen in the biochemical pool; and the compensation adjustment module is used for receiving the control instruction and is matched with the dissolved oxygen control module to carry out nitrogen and phosphorus removal on the water in the biochemical tank and/or the sedimentation tank. Has the advantages of deep denitrification and dephosphorization, energy saving and consumption reduction.
Description
Technical Field
The invention relates to a water treatment and purification control system, in particular to a sewage deep nitrogen and phosphorus removal control system.
Background
The sewage treatment is a process for removing impurities, COD, BOD, total phosphorus, total nitrogen, ammonia nitrogen and other pollutants in raw water by physical, chemical, biological and other methods. At present, the biological nitrogen and phosphorus removal new technologies mainly comprise a short-cut nitrification and denitrification technology, a denitrification and phosphorus removal technology, a synchronous nitrification and denitrification technology, an anaerobic nitrogen oxidation technology and the like, the new technologies all face the problem of stable accumulation of nitrite, the research depths and stages of the new technologies are different, and the engineering application in the field of domestic sewage treatment is less.
The invention patent of China with publication number CN 107032488B discloses a method for realizing short-cut nitrification of municipal sewage by a sludge double-reflux AOA process, which is shown in figure 1 and comprises a biochemical tank 1 and a sedimentation tank 2 which are formed by a continuous flow anaerobic zone/an aerobic zone/an anoxic zone (AOA process), wherein the biochemical tank 1 adopts a sludge double-reflux technology to realize synchronous nitrification and denitrification in the aerobic zone and accumulation of nitrite and partial short-cut nitrification, and simultaneously realizes endogenous storage of sludge by utilizing a carbon source in the raw sewage, thereby realizing aeration saving and energy saving, theoretically achieving the purpose of complete denitrification, and realizing partial nitrification and high-efficiency denitrification from the municipal sewage with low C/N ratio.
AOA process in the anaerobic stage (A)0) The method mainly comprises the steps of removing organic matters, releasing phosphorus and denitrifying, wherein denitrifying bacteria convert the organic matters in the sewage into internal carbon sources and store the internal carbon sources in cells at the stage. Meanwhile, denitrification is carried out, phosphorus is released, total nitrogen is removed, and preparation is made for phosphorus absorption in an aerobic stage; nitrification, nitrosation and aerobic phosphorus absorption mainly occur in the aerobic stage, phosphorus is removed by discharging excess sludge, and COD is further removed at the same time; relevant documents show that the AOA process can realize a synchronous nitrification and denitrification process in the operation process, the total nitrogen removal contribution rate is 27.77 percent, and endogenous denitrification mainly occurs in the anoxic stageAnd (3) acting, providing high PHA and Gly by the returned sludge, and completing the denitrification process by using the intracellular carbon source stored in the anaerobic stage by the denitrifying bacteria to realize deep denitrification.
In addition, in fig. 1, raw water from the raw water adjusting tank 3 is treated by the biochemical tank 1 and the sedimentation tank 2 to become clean water meeting design requirements. The blower 4 is used for aerating an aerobic zone in the biochemical tank 1, the return pump 51 is used for conveying sludge to an anaerobic zone in the biochemical tank 1, the return pump 52 is used for inputting sludge to an anoxic zone in the biochemical tank 1, and medicines are added into a reaction zone of the sedimentation tank through the dosing device 6 as required. Valves are provided in the respective pipes shown in fig. 1, and the opening of the control valve is adjusted in an early stage based on the actual conditions in the respective tanks observed during the water treatment process to perform the control during the water treatment process.
The AOA process is provided with double sludge backflow, the first group of sludge backflow to the anaerobic zone is conventional sludge backflow, and sludge is provided for the whole reaction; the second group of sludge flows back to the front section of the anoxic zone, which is the special sludge flow of the process, and the endogenous denitrification effect in the anoxic stage is enhanced mainly by introducing the part of sludge containing the internal carbon source. The control key points of the technology in engineering application are as follows: 1) control of anaerobism A0The anoxic zone A specifically inhibits nitrite oxidizing bacteria (NOB, which oxidizes nitrite into nitrate) and ammonia oxidizing bacteria (AOB, which oxidizes ammonia into nitrite), and the activity recovery rates of the NOB and the AOB in an aerobic stage are different, so that the AOB becomes a dominant flora in the aerobic stage, and a biological environment is provided for partial nitrification and synchronous nitrification and denitrification. 2) The aerobic zone controls dissolved oxygen and sludge age to realize partial short-cut nitrification, realize synchronous nitrification and denitrification, realize deep denitrification and improve denitrification efficiency. 3) The post-anoxic condition is controlled to provide an environment for sludge decay fermentation, an internal carbon source of sludge is released, and meanwhile, the denitrification effect of the anoxic zone is enhanced by utilizing the internal carbon source of the second group of returned sludge.
In the operation process of the system, all process parameters such as water inflow, dissolved oxygen, pH, sludge reflux and the like have the characteristics of high nonlinearity, strong coupling, time variation, large hysteresis, serious uncertainty and the like, so that the problem that the conventional switch control and single PID control cannot realize the stable and accurate control of the sewage treatment process is caused; the control system can not control and adjust the single parameter or the single link; when some parameters of the system are changed, the processing effect is affected.
Disclosure of Invention
The invention mainly aims to provide a control system for a sludge double-reflux AOA (argon oxygen decarburization) based deep nitrogen and phosphorus removal process.
In order to achieve the above object, the present invention provides a sewage denitrification and dephosphorization control system based on AOA process, comprising: the data acquisition and processing module is used for acquiring and processing data in the biochemical pool and/or the sedimentation pool; the control module is used for comparing the data transmitted by the data acquisition and processing module with a plurality of preset data intervals and further sending a control instruction corresponding to the data falling into a certain data interval; the dissolved oxygen control module is used for receiving the control instruction and adjusting the dissolved oxygen in the biochemical pool; and the compensation adjustment module is used for receiving the control instruction and is matched with the dissolved oxygen control module to carry out nitrogen and phosphorus removal on the water in the biochemical tank and/or the sedimentation tank.
The further scheme is that the compensation adjustment module comprises: and the water inlet control module is used for receiving the control instruction and adjusting the water inlet amount in the biochemical pool and/or the sedimentation pool.
Further, the compensation adjustment module further comprises: and the sedimentation tank control module is used for receiving the control instruction and adjusting the dosage and/or sludge discharge of the sedimentation tank.
Still further, the compensation adjustment module further comprises: and the sludge control module is used for receiving the control instruction and adjusting the sludge reflux amount and the residual sludge discharge amount in the biochemical tank.
The dissolved oxygen control module controls the frequency of a blower and the opening of a valve to ensure that the aeration flow and the pressure of a main pipe are consistent with the output value of the control module; the water inlet control module ensures that the water inlet flow rate is consistent with the output value of the control module by controlling the frequency of the pump and the opening degree of the valve; the sedimentation tank control module ensures that the sludge level in the sedimentation tank does not exceed a threshold value by controlling the opening of a sludge discharge valve of the sedimentation tank; the sludge control module ensures the sludge reflux amount and the residual sludge discharge amount of the biochemical tank by controlling the frequency of the reflux pump and the opening degree of the valve.
The other further scheme is that the data acquisition and processing module acquires data through a rotary valve, and instruments with the same performance and parameters are connected with a plurality of sewage sampling pipes through the rotary valve in a unified mode.
According to the scheme, the invention utilizes fuzzy reasoning to change the parameters of the controller on line in real time so as to adapt to the change of the working point according to the output error of the system and the first-order differential change of the error. Because the traditional PID controller has the characteristic of simple structure, the two controllers are combined together to form a fuzzy gain scheduling PID control system. And according to the change of the scheduling variable, the control parameters are adjusted on line in real time through fuzzy reasoning, and respective control parameters are given to each working point of the whole system to generate global compensation, so that the system control parameters achieve global optimization. The control module is used as a master control module, and forms a fuzzy gain scheduling and PID system with the dissolved oxygen control module and the compensation adjustment module, so that the problems of unstable, stable and accurate sewage treatment process and difficulty in control caused by the characteristics of system nonlinearity, strong coupling, time variation, large lag, uncertainty and the like are effectively solved. The compensation adjusting module can be one or all of a water inlet control module, a sedimentation tank control module and a sludge control module, so that a fuzzy gain scheduling and PID system is formed, and the precision of the control system is effectively improved. Particularly, the invention can achieve the technical effect of deep nitrogen and phosphorus removal, namely, the total nitrogen can be effectively removed.
Drawings
FIG. 1 is a schematic diagram of a prior art AOA process for sewage treatment;
FIG. 2 is a control schematic diagram of a data acquisition processing module in an embodiment of the present invention;
FIG. 3 is a control schematic diagram of a dissolved oxygen control module in an embodiment of the present invention, with the outlet line controlling the reflux pump omitted;
FIG. 4 is a control schematic of the intake control module in an embodiment of the present invention;
FIG. 5 is a control schematic diagram of a sludge control module and a sedimentation tank control module in an embodiment of the present invention;
fig. 6 is a schematic diagram of the connections and signal flow of the rotary valve of fig. 2.
Detailed Description
The invention will be further described with reference to the following examples and the accompanying drawings, in which fluid lines are shown in solid lines and signal flows in dashed lines.
Data acquisition processing module and control module: referring to fig. 2, the biochemical tank 1 in this example has An anaerobic zone An, An aerobic zone O and An anoxic zone a which are arranged in sequence, the raw water adjusting tank 3 supplies water to the anaerobic zone through a pump 8 on a main pipe, and the water inlet on-line instrument of the main pipe has: a COD online detector (COD with a ring in the figure), an ammonia nitrogen online detector (NH 4-N with a ring in the figure), a total phosphorus online detector (TP with a ring in the figure) and a total nitrogen online detector (TN with a ring in the figure); the biochemical process on-line instrument of the anaerobic zone comprises: an oxidation-reduction potential detector (ORP with a ring in the figure), a dissolved oxygen on-line detector (DO with a ring in the figure), and a pH/temperature on-line detector (pH/T with a ring in the figure); the biochemical process on-line instrument of the aerobic zone comprises: a pH/temperature online detector (pH/T with a ring in the figure), an MLSS sludge concentration meter and DO with a ring in the figure of the dissolved oxygen online detector); the biochemical process on-line instrument of the anoxic zone comprises: an oxidation-reduction potential detector (ORP with a circle in the figure), a dissolved oxygen on-line detector (DO with a circle in the figure), a pH/temperature on-line detector (pH/T with a circle in the figure), and an MLSS sludge concentration meter; the water outlet on-line instrument of the water outlet main pipe of the sedimentation tank 2 comprises: suspended solid concentration online detector (SS with circle in the figure), COD online detector, ammonia nitrogen online detector, total phosphorus online detector, total nitrogen online detector and electromagnetic flowmeter. The data of the above-mentioned on-line detectors are transmitted to the data acquisition processing module 100, the data acquisition processing module 100 is composed of a programmable controller and corresponding software, after the data obtained is calculated and processed, it is transmitted to the control module 200 in the computer 7 through the network communication module 10 by using the bus, the control module 200 is stored with a plurality of preset data intervals C1, C2 … CN, these data intervals form a continuous non-overlapping data interval, each data interval corresponds to a corresponding control instruction, the control module 200 compares the data transmitted from the data acquisition processing module 100 in real time, when the transmitted data falls into a certain data interval Ci, it transmits a control instruction corresponding to the data interval, the control instruction can be transmitted according to the address of the execution module aiming at different execution modules, or can be a control instruction group, the different execution modules select the control action to be executed by the execution modules. In addition, because each area of the biochemical pool 1 has the same detection parameters and adopts instruments with the same performance and parameters, a rotary valve 9 can be adopted to select the detected water sample, and the specific implementation is shown in fig. 6 and described below.
Referring to fig. 6, the rotary valve 9 collects the sampling tubes 91, 92, 93 and 94 of each aerobic zone to the online meter 95, the online meter 95 transmits data to the data acquisition and processing module 100, the data acquisition and processing module 100 transmits the processed data to the control module 200, and the data acquisition and processing module 100 can control the selection of the rotary valve 9. The rotary valve 9 has the advantages of saving on-line detection instruments, being capable of selecting detection points in a targeted manner, relatively improving the processing speed of the system and saving cost.
A dissolved oxygen control module: referring to fig. 3, the dissolved oxygen control module 300 is composed of a programmable controller and corresponding software, and after receiving a control instruction from the control module 200, controls the frequency of the blower 4, the opening of the regulating valve 310 and the regulating valve 320 on the blast branch pipe of the aerobic zone and the pressure of the main pipe (circled PI in the figure) according to the control instruction, so as to adjust the frequency of the blower 4 and the opening of the regulating valve 310 and the regulating valve 320 on the blast branch pipe of the aerobic zone to realize the control of aeration rate, ensure that the oxygen utilization rate is 30% to 45% through the special aeration device 330, and perform feedback correction through the gas flow meter 311 and the gas flow meter 321, i.e., the valve combination constant pressure flow control. The air pipe valves of the blower 4 of the whole system are not adjusted to be single in opening degree, but all the valves are adjusted synchronously, so that the strong coupling when the single valve is controlled is eliminated. Controlling the dissolved oxygen in the aerobic zone to be 1.5-2 mg/l, and controlling the dissolved oxygen at the anoxic end to be stably below 0.05-0.5 mg/l. The A/O area of the biochemical pool can be used as an oxygen area or an anoxic area, and can be switched between aerobic and anoxic according to the control instruction of the control module 200.
The water inlet control module: referring to fig. 4, the water inlet module 400 is composed of a programmable controller and corresponding software, and when receiving a control command from the control module 200, controls the frequency of the pump 8 according to the control command; the water inlet is adjusted as follows, the frequency of the water pump 8 is adjusted through the feedback value of the water inlet flow meter 410, and the control instruction received by the control module 200 is met; meanwhile, the water outlet electric valve 420 of the biochemical tank 1 and the water inlet valve of the sedimentation tank are also adjusted. The water inflow of the biochemical pool 1 is subjected to gain scheduling control through fuzzy reasoning by online instrument data provided by the data acquisition and processing module 100 to provide a required set value, and then is subjected to feedback control through the field water inflow control module 400 to meet the carbon source requirement of the system and the optimal denitrification and dephosphorization effect. The hydraulic retention time HRT is controlled by the water inlet control module.
Sludge control module and sedimentation tank control module: referring to fig. 5, the sludge control module 500 and the sedimentation tank control module 600 are composed of programmable controllers and corresponding software, and when the sludge control module 500 receives a control instruction from the control module 200, the frequency of the reflux pump 51 and the opening degree of the valve 510 are controlled to ensure the sludge reflux amount of the anaerobic zone, and the reflux amount is subjected to feedback correction through the flowmeter 511 arranged on line; controlling the frequency of the reflux pump 52 and the opening degree of the valve 530 to ensure the reflux quantity of the sludge in the anoxic zone, and performing feedback correction on the reflux quantity through an online flow meter 531; the A/O area of the biochemical pool is also used as an aerobic area or an anoxic area, aerobic/anoxic switching can be carried out according to the control instruction of the control module 200, the frequency of the reflux pump 51 and the opening degree of the valve 520 are controlled, and the sludge reflux amount is ensured; the return flow amount is feedback-corrected by the flow meter 521. The module receives a control instruction of the control module 200, so that the height of the sludge in the secondary sedimentation tank is kept at 0.5-0.7 m, the retention time is kept at 40-80 min, anaerobic phosphorus release caused by overlong retention time is prevented, the total phosphorus in effluent exceeds the standard, and the residual sludge is discharged through a sludge discharge valve 540. The sludge flowing back to the anoxic tank is accurately distributed through the control combination of the pumps and the valves, so that the energy consumption of a return system can be effectively reduced, the control operation instruction of the sludge control module 500 is sent by the control module 200 in real time, and the frequency and the opening degree of the valve 510 of the return pump 51, the frequency and the opening degrees of the valve 520 and the valve 530 of the return pump 52 are adjusted in a closed loop through the on-site sludge control module 500, the flowmeter 521 and the flowmeter 531. The process is provided with double sludge refluxes, wherein the first group of refluxes to the anaerobic zone is the conventional sludge refluxes to provide sludge for the whole reaction; the second group of sludge flows back to the front section of the anoxic zone, and the endogenous denitrification effect in the anoxic stage is enhanced mainly by introducing the part of sludge containing the internal carbon source. When the sedimentation tank control module 600 receives the control command of the control module 200, the chemical dosing device 6 is controlled to dose chemicals to the sedimentation tank 2 according to the command, and also to discharge the sludge in the reaction zone according to the command, so that a part of the sludge in the sedimentation zone is returned and the other part of the sludge is discharged. Sedimentation tank control module 600 is used for controlling two heavy pond dirty mud valves of arranging, realizes mud volume control to with the linkage of mud backward flow control, carry out mud level control through the level controller that sets up in the sedimentation tank, when the required backward flow mud volume of system surpassed the threshold value, and sedimentation tank mud surpassed the mud level height or the dwell time that allow, the mud valve was arranged in the control and is arranged mud.
To sum up, the control module 200 reads the data of the data acquisition processing module 100, performs fuzzy gain scheduling processing, calculates nonlinear control into linear control of a plurality of balance points, and then sends control signals to the dissolved oxygen control module 300 and the compensation adjustment module in this example to perform equipment control, that is, the dissolved oxygen control module cooperates with the water inlet control module, the sludge control module and the sedimentation tank control module as the compensation adjustment module to perform control, so that the anaerobic zone of the system synthesizes internal carbon sources PHAs by using COD in domestic sewage, and performs anaerobic phosphorus release; then the mixed liquid enters an aerobic zone to generate short-cut nitrification reaction, and the control is accurate; finally, entering an anoxic zone to generate denitrification reaction of the internal carbon source. The NOB is subjected to starvation treatment by gradually increasing the ammonia nitrogen load of inlet water and long-time anaerobic/anoxic treatment, so that the short-range nitrification and endogenous denitrification nitrogen removal of the municipal sewage are realized, and the purpose of deep nitrogen and phosphorus removal is achieved.
Claims (6)
1. A sewage denitrification and dephosphorization control system based on AOA technology is characterized by comprising:
the data acquisition and processing module is used for acquiring and processing data in the biochemical pool and/or the sedimentation pool;
the control module is used for comparing the data transmitted by the data acquisition and processing module with a plurality of preset data intervals and further sending a control instruction corresponding to the data falling into a certain data interval;
the dissolved oxygen control module is used for receiving the control instruction and adjusting the dissolved oxygen in the biochemical pool;
and the compensation adjustment module is used for receiving the control instruction and is matched with the dissolved oxygen control module to carry out nitrogen and phosphorus removal on the water in the biochemical tank and/or the sedimentation tank.
2. The AOA process-based sewage nitrogen and phosphorus removal control system of claim 1, wherein:
the compensation adjustment module comprises
And the water inlet control module is used for receiving the control instruction and adjusting the water inlet amount in the biochemical pool and/or the sedimentation pool.
3. The AOA process-based sewage nitrogen and phosphorus removal control system of claim 2, wherein:
the compensation adjustment module further comprises
And the sedimentation tank control module is used for receiving the control instruction and adjusting the dosage and/or sludge discharge of the sedimentation tank.
4. The AOA process-based sewage denitrification and dephosphorization control system according to any one of claims 1 to 3, wherein:
the compensation adjustment module further comprises
And the sludge control module is used for receiving the control instruction and adjusting the sludge reflux amount and the residual sludge discharge amount in the biochemical tank.
5. The AOA process-based sewage nitrogen and phosphorus removal control system of claim 4, wherein:
the dissolved oxygen control module ensures that the aeration flow and the header pipe pressure are consistent with the output value of the control module by controlling the frequency of the blower and the opening of the valve;
the water inlet control module ensures that the water inlet flow rate is consistent with the output value of the control module by controlling the frequency of the pump and the opening degree of the valve;
the sedimentation tank control module ensures that the sludge level in the sedimentation tank does not exceed a threshold value by controlling the opening of a sludge discharge valve of the sedimentation tank;
the sludge control module ensures the sludge reflux amount and the residual sludge discharge amount of the biochemical tank by controlling the frequency of the reflux pump and the opening degree of the valve.
6. The AOA process-based sewage nitrogen and phosphorus removal control system of claim 1, wherein:
the data acquisition and processing module acquires data through the rotary valve, and instruments with the same performance and parameters are connected with a plurality of sewage sampling tubes through the rotary valve in a unified mode.
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