CN201016100Y - Subsection water feeding A/O technique oxygen dissolving and carbon source addition fuzzy control device - Google Patents
Subsection water feeding A/O technique oxygen dissolving and carbon source addition fuzzy control device Download PDFInfo
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- CN201016100Y CN201016100Y CNU2007201034725U CN200720103472U CN201016100Y CN 201016100 Y CN201016100 Y CN 201016100Y CN U2007201034725 U CNU2007201034725 U CN U2007201034725U CN 200720103472 U CN200720103472 U CN 200720103472U CN 201016100 Y CN201016100 Y CN 201016100Y
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 25
- 239000001301 oxygen Substances 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 23
- 239000010865 sewage Substances 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 239000010802 sludge Substances 0.000 claims abstract description 8
- 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 35
- 238000005273 aeration Methods 0.000 claims description 25
- 238000005259 measurement Methods 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 19
- 229910002651 NO3 Inorganic materials 0.000 abstract description 11
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 9
- 238000006396 nitration reaction Methods 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 2
- 238000005276 aerator Methods 0.000 abstract 1
- 229910021529 ammonia Inorganic materials 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 25
- 230000000694 effects Effects 0.000 description 14
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 238000004886 process control Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005112 continuous flow technique Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model provides a step-feed A/O technological dissolved oxygen and carbon addition fuzzy control device, belonging to the biological disposing field of the sewage. The device comprises a multi-step feed A/O biological nitrogen removal reactor and a set of dissolved oxygen and carbon addition fuzzy control device. Wherein, the multi-step feed A/O biological nitrogen removal reactor is provided with a microhole aerator, an electric agitator, a movable clapboard, a water intake pump, a fan, a sedimentation basin, a sludge reflow pump and a raw water storing tank. The fuzzy control system comprises an ammonia and nitrate online sensor, a nitrate online sensor, a computer host, a monitor and a fuzzy control execution mechanism. Adopting the new technology and the intelligent control method for disposing the sewage, the device can perfectly embody the influence of the dissolved oxygen control and the external carbon source addition control on the multi-step feed A/O biological nitrogen removing process as well as on the nitration and the denitrification processes.
Description
Technical field
The utility model relates to a kind of biological denitrification process fuzzy control device of sewage, belongs to activated sludge process Sewage treatment systems theory, method and the technical field of control automatically, is applicable to the biological treatment of nitrogenous Industrial Wastewater Treatment and town domestic sewage.
Background technology
Eutrophication problem is one of topmost water pollution problems of facing of various countries, the world today, and the discharging that exceeds standard of nitrogen, phosphorus then is the major cause that causes eutrophication.For solving serious day by day water pollution problems, China has increased total nitrogen, the highest permission emission concentration of total phosphorus in " the urban wastewater treatment firm pollutant emission standard " of new promulgation in 2002, simultaneously also the water outlet ammonia nitrogen has been proposed stricter requirement, the principal contradiction of visible sewage disposal is changed into the removal of nitrogen and phosphorus pollutants gradually by the removal of organic pollutant.All newly-built sewage works all must be provided with the necessary processing facility to satisfy the demand of denitrogenation dephosphorizing at present.Simultaneously, the newly-built water factory that more and more higher sewage discharge index is must consider to adopt advanced process control technology, to reduce running cost, improves effluent quality.
Biological denitrification process mainly is divided into two portions, promptly by nitrification ammonia nitrogen is converted into nitrate nitrogen, by denitrification nitrate nitrogen is converted into nitrogen again and overflows from water, thereby reach the removal of nitrogen.Continuous Flow subsection water inflow A/O biological denitrification process is to propose through suitably improving on traditional A/O technology basis.It has the nitric efficiency height, need not to be provided with advantages such as nitrification liquid internal reflux facility, saving medicament throwing amount.But the A/O technology relative complex that this technology is more traditional, therefore, the process control mode of seeking suitable segmental influent and biological denitrification is a difficult problem always.
Adopt traditional process control to set up precise math model to reaction process.And sewage biological treatment system is the dynamic system of typical multivariate, non-linear, multiprocessing target, the complicacy of multi-section water-inlet A/O technology in addition, be difficult to set up the mathematical model of its reaction process, therefore, if adopting traditional process control controls system, occur under the unusual situation in system, be difficult to guarantee the water outlet effect.And fuzzy control is an important branch of intelligent control, and it mainly is apish experience rather than the mathematical model that depends on controlled member, realizes some intelligence of people, is applicable to the control of complicated dynamic system.At present, fuzzy control is existing certain application in biological sewage treatment, but majority is applied in sequence batch ((SBR) the active sludge treatment process process, and the continuous flow process process is used less.
The utility model content
The purpose of this utility model provides the fuzzy control device and the method for a kind of assurance Continuous Flow multi-section water-inlet A/O biological denitrificaion nitrification and denitrification effect.After adopting this fuzzy control device and method, system can in time adjust the denitrifying carbon source dosage of aeration rate and oxygen-starved area of aerobic zone according to the real-time change of water outlet ammonia nitrogen and nitrate nitrogen concentration, thereby guarantees that nitrification and denitrification is complete.After adopting this fuzzy control method, 1. avoid traditional permanent aeration rate control, when the influent ammonia nitrogen load was low, aeration energy consumption was big, the waste energy, and influent ammonia nitrogen is loaded when high, can not satisfy the problem of water outlet requirement.2. control the dosage of carbon source in real time, add carbon source, avoid the carbon source waste at the remaining nitrate nitrogen in water side.3. control easier realization and operation than conventional procedure, and control accuracy is higher.
Know-why of the present utility model:
Continuous Flow multi-section water-inlet A/O dissolved oxygen and carbon source add fuzzy control principle, it is characterized in that: the numerary signal of on-line acquisition system water side DO and nitrate nitrogen concentration, reflect the variation of influent quality, and numerary signal is input to fuzzy controller, after fuzzy controller is handled, output directly acts on aerating system and outer carbon source dosing system, adjust most important controlled variable---important control parameter of dissolved oxygen (DO) concentration and denitrification process---the carbon source amount of nitrifying process, thereby guarantee nitrification effect and denitrification effect.Concrete principle is as follows:
(1) in the nitrifying process of biological denitrificaion, DO is a most important control parameters, and when influent ammonia nitrogen is loaded when high, aerobic zone DO concentration can corresponding reduction, at this moment, needs to improve the aeration rate of aerobic zone, to guarantee nitrification effect, the water outlet ammonia nitrogen is met the demands; And in the denitrification process of biological denitrificaion, the feed rate of organic carbon source then is a most important control parameters.Usually, denitrification system all wishes to utilize as far as possible the carbon organism in the raw waste water to provide carbon source for denitrification, but the carbon source in the former water is not enough usually, and this just need add outer carbon source, to finish denitrification, overflows from system thereby nitrate nitrogen is changed into nitrogen.
(2) when the influent ammonia nitrogen load variations, because aeration rate is too high or not enough, aerobic zone water outlet DO concentration can reduce or raise.At this moment, can be according to the two integrated information of the variation delta e of the DO concentration measured value of online acquisition and deviation e between the DO set(ting)value given in advance and deviation e, the load disturbance that comes the judgement system to be stood, provide rational aeration rate increment Delta u, thereby the DO concentration of control aerobic zone guarantees nitrated.When influent ammonia nitrogen and COD load variations, because carbon source adds deficiency or excessive, oxygen-starved area water outlet nitrate nitrogen concentration can raise or reduce.At this moment, integrated information according to the variation delta E of deviation E between the nitrate concentration measured value of online acquisition and the nitrate concentration set(ting)value given in advance and deviation E, influent load disturbance that can decision-making system stood, providing reasonably, outer carbon source adds variation delta U.
The multi-section water-inlet A that the utility model provides/O dissolved oxygen and carbon source add fuzzy control device, sewage water storage tank 1 is connected with reactor 2 by water inlet pipe, reactor 2 through rising pipe be connected with settling tank 3, settling tank mud is back to the Reactor inlet end through sludge reflux pump 4, and adopting air compressor machine 5 is the aerobic zone oxygen supply of reactor.It is characterized in that,
Reactor is divided into three sections of I, II, III, and each section comprises that an oxygen-starved area and two aerobic zones, I section comprise aerobic zone 8 after aerobic zone 7 before 6, the I sections of I section oxygen-starved area, the I section; The II section comprises aerobic zone 11 after II section oxygen-starved area 9, the preceding oxygen-starved area 10 of II section, the II section; The III section comprises aerobic zone 14 after aerobic zone 13 before the III section oxygen-starved area 12, III section, the III section; Nitrate nitrogen on-line sensor 15 is installed in the III section oxygen-starved area 12, the data signal of gathering is input to carbon source through nitrate nitrogen signal input interface 16 and adds fuzzy controller 17, after carrying out fuzzy rule and algorithm process, output variable acts on outer carbon source and adds volume pump 19 through outer carbon source dosage signal output interface 18; Back aerobic zone in the III section is installed DO on-line sensor 20, the online DO data signal of gathering is input to permanent DO fuzzy controller 22 through dissolved oxygen signal input interface 21, after carrying out fuzzy rule and algorithm process, output variable is through aeration rate output interface output 23, act on frequency transformer 24, adjust the discharge quantity of fan of air compressor machine 5, air flow measurement instrument 25 is installed on the air compressor machine export pipeline.
Multi-section water-inlet A of the present utility model/O biological denitrification process and dissolved oxygen and outer carbon source add fuzzy control method,
Dissolved oxygen fuzzy control: the dissolved oxygen concentration that adopts permanent DO fuzzy Control aerobic zone.Back aerobic zone 14 in reactor III section is installed DO on-line sensor 20, reflects the variation of influent ammonium concentration by the variation of DO concentration.When DO concentration raises, show that into ammonia nitrogen loading reduces in the water, need to reduce the aeration rate of aerobic zone this moment, and aeration energy consumption avoids waste; When DO concentration reduces, show that the influent ammonia nitrogen load raises, need to strengthen the aeration rate of aerobic zone, to guarantee nitrification effect.The utility model adopts the aeration rate of permanent DO fuzzy Control system, back aerobic zone DO concentration set point is got 1.5mg/L, the variation delta e of the DO concentration measured value that DO on-line sensor 20 after the III section in the aerobic zone 14 is gathered and the deviation e of DO set(ting)value and deviation e is as permanent DO input variable of fuzzy controller, input variable is through Fuzzy processing, provide control law, export as fuzzy with aeration rate increment Delta u, the fuzzy quantity of output is again through the de-fuzzy process, draw definite manipulated variable, act on air compressor machine frequency transformer 24, the aeration rate of control aerating system.
Outer carbon source adds fuzzy control: adopt outer carbon source to add the nitrate nitrogen concentration of fuzzy Control water outlet oxygen-starved area water outlet.Nitrate nitrogen on-line sensor 15 is installed in oxygen-starved area 12 in reactor III section, indicates the variation of influent load and the denitrification effect of system by the variation of nitrate nitrogen.When nitrate nitrogen raises, illustrative system denitrification deleterious, at this moment, the dosage that needs to increase outer carbon source comes intensified anti-nitrated effect; And when nitrate nitrogen concentration is low, then reduce the dosage of outer carbon source, to save carbon source, reduce running cost.The utility model adopts the congenial fuzzy controller of outer carbon source to come the outer carbon source dosage of Controlling System, the set(ting)value of oxygen-starved area water outlet nitrate nitrogen is got 5mg/L, the variation delta E of the nitrate nitrogen measured value of the nitrate nitrogen on-line sensor collection in the III section oxygen-starved area 12 and the deviation E of nitrate nitrogen set(ting)value and deviation E adds input variable of fuzzy controller as outer carbon source, input variable is through Fuzzy processing, provide control law, the increment Delta U of carbon source dosage is as fuzzy output in addition, fuzzy work output is again through the de-fuzzy process, draw definite manipulated variable, act on outer carbon source and add volume pump 19, the dosage of the outer carbon source of control, thereby the nitrate nitrogen of Controlling System oxygen-starved area water outlet.
The beneficial effects of the utility model:
The utility model in the end one section aerobic zone is provided with the DO on-line sensor, gathers the DO concentration value, and when influent ammonia nitrogen meets when increasing, the dissolved oxygen that nitration reaction consumes increases, and the online concentration of DO reduces; When system's influent ammonium concentration reduced, the dissolved oxygen that nitration reaction consumes reduced, and the online concentration of DO raises.According to this rule, and service experience and testing data, permanent DO fuzzy controller designed, the aeration rate of Controlling System.This fuzzy controller can be judged the variation of influent ammonia nitrogen load according to the variation of real-time DO concentration, adjusts aeration rate in real time, guarantees nitrification effect.In the end one section oxygen-starved area is provided with the nitrate on-line sensor, gathers the nitrate nitrogen concentration value, and this nitrate nitrogen concentration value is several sections common cumulative nitrate nitrogen total amounts in system front, adds outer carbon source in view of the above, both can save carbon source, can guarantee effluent quality again.
Multi-section water-inlet A/O technology the dissolved oxygen of the utility model design and outer carbon source add fuzzy control device and method compared with prior art, have the following advantages:
(1) denitrification effect is good, and the water outlet ammonia nitrogen is less than 5mg/L, and total nitrogen is less than 10mg/L.In the pollution exhaust criterias of country promulgation in 2002, to the strict emission control standards of town sewage be ammonia nitrogen less than 5mg/L, total nitrogen is less than 15mg/L, the water outlet ammonia nitrogen of the utility model design and total nitrogen can satisfy and be lower than the pollution exhaust criteria of country's promulgation.
(2) the on-line measurement device is less, reduces the Controlling System investment.In the utility model design, permanent DO fuzzy controller only needs a DO concentration on-line sensor, and its price is far below online nutrition transmitter.And add fuzzy controller for outer carbon source, only adopt a nitrate on-line sensor.Can reduce the investment of Controlling System greatly, and reduce the complexity of Controlling System, be easy to management.
(3) the utility model device is gathered the signal of DO concentration value as the influent ammonia nitrogen load variations in real time, and adjusts aeration rate in real time by permanent DO fuzzy controller, and therefore, the ability of system's opposing water inlet impact load strengthens greatly.
(4) the utility model device in the end is provided with the nitrate transmitter in one section oxygen-starved area, the nitrate nitrogen of gathering is the total amount of total system cumulative nitrate nitrogen, adds outer carbon source in view of the above, can farthest save the dosage of outer carbon source, reduce running cost, and treatment effect is reliable.
Multi-section water-inlet A of the present utility model/O dissolved oxygen and outer carbon source add control method, can be widely used in adopting the large, medium and small city domestic sewage of Continuous Flow multi-section water-inlet A/O technology, the processing of trade effluent, be particularly useful for the processing of low C/N sanitary sewage, treatment effect is good, and working cost is low.
Description of drawings
Fig. 1 is that subsection water inflow A/O technology dissolved oxygen and carbon source add the fuzzy control device structural representation
Among Fig. 1,1-sewage storage pool, 2-multi-section water-inlet A/O reactor, the 3-settling tank, the 4-sludge reflux pump, the 5-air compressor machine, 6-I section oxygen-starved area, aerobic zone before the 7-I section, aerobic zone after the 8-I section, 9-II section oxygen-starved area, aerobic zone before the 10-II section, aerobic zone after the 11-II section, 12-III section oxygen-starved area, aerobic zone before the 13-III section, aerobic zone after the 14-III section, 15-nitrate nitrogen on-line sensor, 16-nitrate nitrogen signal input interface, the 17-carbon source adds fuzzy controller, the outer carbon source dosage signal output interface of 18-, the outer carbon source of 19-adds volume pump, the 20-DO on-line sensor, 21-dissolved oxygen signal input interface, the permanent DO fuzzy controller of 22-, 23-aeration rate output interface, the 24-frequency transformer, 25-air flow measurement instrument.
Fig. 2: implement after the permanent DO fuzzy control influent ammonia nitrogen and water outlet ammonia nitrogen concentration variation diagram in 1 day
Fig. 3: implement outer carbon source and add water outlet nitrate nitrogen and the total nitrogen concentration variation diagram in 1 day after the fuzzy control
Embodiment
In conjunction with the embodiments, the operation process of the utility model technology is:
With the real life sewage of certain university dependents' district discharging as experimental subjects (COD=160～290mg/L, TN=35～80mg/L).The multi-section water-inlet A that is adopted/O biological denitrification reactor dissolving 300L is divided into 3 sections, every section volume 100L.System is provided with 1 air compressor machine, and maximum air output is 8m3/h, and minimum air output is 0.Reactor at first carries out the culturing sludge domestication, and the sludge concentration that domestication finishes each section of back is: the I section is 5～5.5g/L, and the II section is 4～4.5mg/L, III section 2.8～3.2mg/L.Reactor day is handled water yield 900L, I section flooding quantity 11.2L/h, and II section water inlet 15L/h, the water inlet of III section is 11.2L/h.Temperature of reaction is 20 ℃.
At the beginning of the system operation, the outlet aeration rate of air compressor machine is adjusted into 3m3/h, water inlet COD concentration is 180～200mg/L, and ammonia nitrogen concentration is 50～55mg/L.The DO concentration signal that aerobic zone is gathered after the III section is all in 2.5～3.5mg/L scope, under the water inlet condition of this steady concentration, allow system stable operation 7d, begin the real time altering influent load then, and the opening process Controlling System, dissolved oxygen and outer carbon source dosage are carried out fuzzy control.
The change of water quality rule of simulated domestic wastewater illustrates that with change of water quality in 1 day and corresponding water outlet permanent DO fuzzy controller and outer carbon source add the working condition of fuzzy controller:
The dissolved oxygen fuzzy control: the back aerobic zone 14 in reactor III section is installed DO on-line sensors 20, gathers the measured value of DO concentration, and the difference e by measured value and DO set(ting)value (1.5mg/L) and the changes delta e of difference reflect the variation of influent ammonium concentration.In this example, because influent load constantly changes, DO concentration measured value constantly changes, the variable quantity of the deviation e of DO concentration measured value and DO set(ting)value and deviation e constantly changes, and is imported into permanent DO fuzzy controller, and input variable is through Fuzzy processing, adopt 7 fuzzy language variablees and the fuzzy language variable is carried out assignment, as fuzzy output, adopt the fuzzy quantity sharpening of weighted mean with aeration rate increment Delta u again, draw definite aeration manipulated variable u output
*, act on the air compressor machine frequency transformer, adjust the air compressor machine rotating speed, thereby adjust the aeration rate of aerating system.Fig. 2 is influent ammonia nitrogen, the water outlet ammonia nitrogen concentration figure that carries out after the permanent DO fuzzy control.As can be seen, influent ammonia nitrogen changes greatly among the figure, and the water outlet ammonia nitrogen is all less than 3mg/L.
Outer carbon source adds fuzzy control: nitrate nitrogen on-line sensor 15 is installed in the oxygen-starved area 12 in reactor III section, indicates the variation of influent load and the denitrification effect of system by the variation of nitrate nitrogen.The set(ting)value of oxygen-starved area water outlet nitrate nitrogen is got 5mg/L, the variation delta E of the nitrate nitrogen measured value of the nitrate nitrogen on-line sensor collection in the III section oxygen-starved area 12 and the deviation E of nitrate nitrogen set(ting)value and deviation E adds input variable of fuzzy controller as outer carbon source, input variable is through Fuzzy processing, E adopts 8 fuzzy language variablees, Δ E and Δ U adopt 7 linguistic variables, and respectively to the linguistic variable assignment, the increment Delta U of carbon source dosage is as fuzzy output in addition, fuzzy work output is again through the weighted mean de-fuzzy, draw clear manipulated variable, act on outer carbon source and add volume pump 19, the dosage of the outer carbon source of control, thereby the nitrate nitrogen of Controlling System oxygen-starved area water outlet.Outer carbon source adds fuzzy controller control effect such as Fig. 3 of system is shown.From figure as can be seen, after outer carbon source fuzzy Control, the concentration of oxygen-starved area water outlet nitrate nitrogen can remain within the set(ting)value 5mg/L.
Dissolved oxygen of the present utility model and outer carbon source add fuzzy control device embodiment referring to Fig. 1.
Concrete, the permanent DO fuzzy control process of multi-section water-inlet A/O technology,
(1) adopt two D controllers, with the two integrated information of the variation delta e of the deviation e of the DO concentration value of online acquisition and DO set(ting)value and deviation e as permanent DO input variable of fuzzy controller, with aeration rate increment Delta u as output variable.
(2) will import clear variable and become fuzz variable through Fuzzy processing.The language value variable of input variable e, Δ e, output variable Δ u all is defined as 7: NB-is negative big, and during NM-was negative, NS-was negative little, and O-zero, and PS-is just little, the PM-center, and PB-is honest.According to service experience and testing data, the discrete domain of the linguistic variable of deviation e is got [1.5,1.5], and the discrete domain of the linguistic variable of Δ e is got [0.3,0.3], and the discrete domain of output aeration increment Delta u is got [6,6].Fuzzy controller input variable e then, the assignment such as the table 1 of the linguistic variable of Δ e and fuzzy output variable Δ u, table 2 and table 3 show.
The linguistic variable assignment table of table 1 deviation e
| -1.5 | -1 | -0.5 | 0 | 0.5 | 1 | 1.5 | |
| NB NM NS O PS PM PB | 1 0 0 0 0 0 0 | 0 1 0 0 0 0 0 | 0 0 1 0 0 0 0 | 0 0 0 1 0 0 0 | 0 0 0 0 1 0 0 | 0 0 0 0 0 1 0 | 0 0 0 0 0 0 1 |
The linguistic variable assignment table of table 2 deviation delta e
| -0.3 | -0.2 | -0.1 | 0 | 0.1 | 0.2 | 0.3 | |
| NB NM NS O PS PM PB | 1 0 0 0 0 0 0 | 0 1 0 0 0 0 0 | 0 0 1 0 0 0 0 | 0 0 0 1 0 0 0 | 0 0 0 0 1 0 0 | 0 0 0 0 0 1 0 | 0 0 0 0 0 0 1 |
The linguistic variable assignment table of table 3 output variable Δ u
| -6 | -5 | -4 | -3 | -2 | -1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| NB NM NS O PS PM PB | 1 0 0 0 0 0 0 | 0.5 0.5 0 0 0 0 0 | 0 1 0 0 0 0 0 | 0 0.5 0.5 0 0 0 0 | 0 0 1 0 0 0 0 | 0 0 0.5 0.5 0 0 0 | 0 0 0 1 0 0 0 | 0 0 0 0.5 0.5 0 0 | 0 0 0 0 1 0 0 | 0 0 0 0 0.5 0.5 0 | 0 0 0 0 0 1 0 | 0 0 0 0 0 0.5 0.5 | 0 0 0 0 0 0 1 |
(3) adopt method of weighted mean will blur output variable Δ u sharpening, export clear value u
*
Through the domain inverse transformation, obtain the accurate manipulated variable of aeration rate.
Concrete, the outer carbon source of multi-section water-inlet A/O technology adds fuzzy control process,
(1) adopts two D controllers, add input variable of fuzzy controller with the two integrated information of the variation delta E of the deviation E of the nitrate nitrogen concentration value of online acquisition and nitrate concentration set(ting)value and deviation E as outer carbon source, the increment Delta U of carbon source dosage is as fuzzy output variable in addition.
(2) will import clear variable and become fuzz variable through Fuzzy processing.Input variable E adopts 8 fuzzy language variable: NB-negative big, and during NM-was negative, NS-was negative little, the NO-negative zero, and the PO-positive zero, PS-is just little, the PM-center, PB-is honest; The language value variable of Δ E, output variable Δ U all is defined as 7: NB-is negative big, and during NM-was negative, NS-was negative little, and O-zero, and PS-is just little, the PM-center, and PB-is honest.According to service experience and testing data, the discrete domain of the linguistic variable of deviation E is got [5,5], and the discrete domain of the linguistic variable of Δ E is got [1,1], exports the discrete domain of the increment Delta U of outer carbon source dosage and gets [12,12].Fuzzy controller input variable E then, the assignment such as the table 4 of the linguistic variable of Δ E and fuzzy output variable Δ U, table 5 and table 6 show.
The linguistic variable assignment table of table 4 deviation E
| -5 | -4 | -3 | -2 | -1 | 0 - | 0 + | 1 | 2 | 3 | 4 | 5 | |
| NB NM NS NO PO |
1 0 0 0 0 0 0 | 1 0 0 0 0 0 0 | 1 0 0 0 0 0 0 | 0 1 0 0 0 0 0 | 0 0 1 0 0 0 0 | 0 0 0 1 0 0 0 | 0 0 0 0 1 0 0 | 0 0 0 0 0 1 0 | 0 0 0 0 0 0 1 | 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 |
| PB | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
The linguistic variable assignment table of table 5 deviation delta E
| -1 | -0.75 | -0.5 | -0.25 | 0 | 0.25 | 0.5 | 0.75 | 1 | |
| NB NM NS O PS PM PB | 1 0 0 0 0 0 0 | 1 0 0 0 0 0 0 | 0 1 0 0 0 0 0 | 0 0 1 0 0 0 0 | 0 0 0 1 0 0 0 | 0 0 0 0 1 0 0 | 0 0 0 0 0 1 0 | 0 0 0 0 0 0 1 | 0 0 0 0 0 0 1 |
The linguistic variable assignment table of table 6 output variable Δ U
| -12 | -10 | -8 | -6 | -4 | -2 | 0 | 2 | 4 | 6 | 8 | 10 | 12 | |
| NB NM NS O PS PM PB | 1 0 0 0 0 0 0 | 0.5 0.5 0 0 0 0 0 | 0 1 0 0 0 0 0 | 0 0.5 0.5 0 0 0 0 | 0 0 1 0 0 0 0 | 0 0 0.5 0.5 0 0 0 | 0 0 0 1 0 0 0 | 0 0 0 0.5 0.5 0 0 | 0 0 0 0 1 0 0 | 0 0 0 0 0.5 0.5 0 | 0 0 0 0 0 1 0 | 0 0 0 0 0 0.5 0.5 | 0 0 0 0 0 0 1 |
(3) adopt method of weighted mean will blur output variable Δ U sharpening, export clear value U
*
Through the domain inverse transformation, obtain accurate outer carbon source dosage.
Utilize permanent Do fuzzy controller and outer carbon source to add fuzzy controller, the final outflow water ammonia nitrogen is less than 3mg/L, and total nitrogen is less than 8mg/L, far below the desired ammonia nitrogen concentration of national grade one discharge standard (≤5mg/L) and total nitrogen concentration (≤15mg/L).
Claims (1)
1. subsection water inflow A/O technology dissolved oxygen and carbon source add fuzzy control device, sewage water storage tank (1) is connected with reactor (2) by water inlet pipe, reactor (2) through rising pipe be connected with settling tank (3), settling tank mud is back to the Reactor inlet end through sludge reflux pump (4), and adopting air compressor machine (5) is the aerobic zone oxygen supply of reactor; It is characterized in that,
Reactor is divided into three sections of I, II, III, and each section comprises an oxygen-starved area and two aerobic zones, and the I section comprises I section oxygen-starved area (6), aerobic zone (8) after aerobic zone (7), the I section before the I section; The II section comprises aerobic zone (11) after II section oxygen-starved area (9), the preceding oxygen-starved area of II section (10), the II section; The III section comprises aerobic zone (14) after aerobic zone (13) before the III section oxygen-starved area (12), III section, the III section; Nitrate nitrogen on-line sensor (15) is installed in the III section oxygen-starved area (12), the data signal of gathering is input to carbon source through nitrate nitrogen signal input interface (16) and adds fuzzy controller (17), after carrying out fuzzy rule and algorithm process, output variable acts on outer carbon source and adds volume pump (19) through outer carbon source dosage signal output interface (18); Back aerobic zone in the III section is installed DO on-line sensor (20), the online DO data signal of gathering is input to permanent DO fuzzy controller (22) through dissolved oxygen signal input interface (21), after carrying out fuzzy rule and algorithm process, output variable is through aeration rate output interface output (23), act on frequency transformer (24), adjust the discharge quantity of fan of air compressor machine (5), air flow measurement instrument (25) is installed on the air compressor machine export pipeline.
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| CNU2007201034725U CN201016100Y (en) | 2007-02-06 | 2007-02-06 | Subsection water feeding A/O technique oxygen dissolving and carbon source addition fuzzy control device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826713A (en) * | 2012-09-05 | 2012-12-19 | 北京工业大学 | Device and method for strengthening and improving segment water sludge reduction by predation action of chironomidae larvae |
| CN105923743A (en) * | 2016-06-21 | 2016-09-07 | 光大环保技术研究院（深圳）有限公司 | Percolate aerobic reaction pool aeration system fuzzy control method and system |
| CN106219618A (en) * | 2016-04-08 | 2016-12-14 | 江苏天雨环保集团有限公司 | Integral intelligent pumping plants based on many water distribution points and water outlet distribution control method thereof |
| CN106527332A (en) * | 2016-11-05 | 2017-03-22 | 杭州裕达自动化科技有限公司 | Precise control system for dissolved oxygen |
-
2007
- 2007-02-06 CN CNU2007201034725U patent/CN201016100Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826713A (en) * | 2012-09-05 | 2012-12-19 | 北京工业大学 | Device and method for strengthening and improving segment water sludge reduction by predation action of chironomidae larvae |
| CN106219618A (en) * | 2016-04-08 | 2016-12-14 | 江苏天雨环保集团有限公司 | Integral intelligent pumping plants based on many water distribution points and water outlet distribution control method thereof |
| CN105923743A (en) * | 2016-06-21 | 2016-09-07 | 光大环保技术研究院（深圳）有限公司 | Percolate aerobic reaction pool aeration system fuzzy control method and system |
| CN106527332A (en) * | 2016-11-05 | 2017-03-22 | 杭州裕达自动化科技有限公司 | Precise control system for dissolved oxygen |
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