CN105152308A - MBR (membrane biological reactor) aerobic tank aeration control method and control system - Google Patents

MBR (membrane biological reactor) aerobic tank aeration control method and control system Download PDF

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CN105152308A
CN105152308A CN201510556389.2A CN201510556389A CN105152308A CN 105152308 A CN105152308 A CN 105152308A CN 201510556389 A CN201510556389 A CN 201510556389A CN 105152308 A CN105152308 A CN 105152308A
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aerobic pond
value
dissolved oxygen
ammonia nitrogen
mbr
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CN105152308B (en
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黄霞
孙剑宇
夏俊林
梁鹏
邱勇
文湘华
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Tsinghua University
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Tsinghua University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention discloses an MBR (membrane biological reactor) aerobic tank aeration control method and control system, wherein the method comprises the following steps of collecting an ammonia-nitrogen concentration signal of a membrane tank; obtaining a first residue difference value between the ammonia-nitrogen concentration signal and the preset ammonia-nitrogen concentration value; obtaining the preset dissolved oxygen concentration value of an aerobic tank through a first-order PI (proportional-integral) algorithm; collecting the dissolved oxygen concentration signal of the aerobic tank; obtaining a second residue difference value between the dissolved oxygen concentration signal and the preset dissolved oxygen concentration value; obtaining an aerobic tank aeration quantity value through a second-order PI algorithm; controlling a plurality of blast blowers according to the aerobic tank aeration quantity value and the blower performance curve. The control method provided by the embodiment of the invention has the advantages that the biochemical action of the membrane tank is further considered; the control precision is improved; the automatic control on the MBR biochemical treatment aeration process is better realized; the water outlet water quality is stabilized; the sewage treatment energy consumption is reduced; simplicity is realized; the realization is easy.

Description

The control method of MBR Aerobic Pond aeration and Controlling System
Technical field
The present invention relates to technical field of sewage, particularly a kind of control method of MBR Aerobic Pond aeration and Controlling System.
Background technology
Still there is the more high deficiency of energy consumption in current MBR (MembraneBioreactor, membrane bioreactor) engineering operation, and the high energy consumption of MBR is mainly caused by the aeration in membrane cisterna and Aerobic Pond.Existing MBR engineering is in operational process, the aeration rate of Aerobic Pond mainly relies on operator's experience to be set as steady state value, and under the condition of necessity, just carry out manual shift, therefore may exist influent load too low time aeration rate superfluous or influent load is higher time aeration rate deficiency problem.Therefore, realize the automatic control to MBR biochemical treatment aeration process, all significant for stable effluent quality, the sewage disposal energy consumption reducing MBR entirety and cost.
In correlation technique, the cardinal principle of existing aeration in sewage treatment automatic control technology is by the dissolved oxygen concentration in monitoring aeration tank, thus carries out feedback control to aeration rate.Wherein, control algolithm is generally proportional integral (PI) or proportion integration differentiation (PID) algorithm of single-input single-output.In addition, according to concrete technology, also have and add on its basis with influent quality, the feed forward control of the water yield for exporting, control algolithm is the model algorithm of the multiple input single output of multiparameter or many condition.
But, there is following shortcoming in correlation technique:
(1) exploitation of correlation technique is all based on the waste water processes adopting conventional activated sludge process, and MBR is compared to conventional activated sludge process, owing to adding the very high membrane cisterna of dissolved oxygen concentration, obvious pollutent aerobic degradation is still there is in membrane cisterna, and sludge reflux also can affect the running status of front end Aerobic Pond, the biochemical reaction effect of membrane cisterna therefore can not be ignored for the control of Aerobic Pond aeration rate.
(2), when adopting single-stage feedback control, the reference mark of dissolved oxygen is generally set by artificial experience, easily occurs error.In the Controlling System having feedforward compensation, due to feed-water end in-line meter work under bad environment, monitoring data is inaccurate, and model error, causes the dissolved oxygen reference mark exported to there is error or concussion, thus not good to the control effects of Aerobic Pond aeration rate.
(3), when adopting expert systems or internal model control strategy, control effects is very large by the impact of model accuracy and parameter calibration, is difficult to be applied in large-scale Practical Project.
Summary of the invention
The present invention is intended to solve one of technical problem in above-mentioned correlation technique at least to a certain extent.
For this reason, one object of the present invention is the control method proposing a kind of MBR Aerobic Pond aeration, and the method can improve control accuracy, and is simple and easy to realize.
Another object of the present invention is the Controlling System proposing a kind of MBR Aerobic Pond aeration.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of control method of MBR Aerobic Pond aeration, and MBR comprises membrane cisterna, Aerobic Pond and multiple gas blower, and wherein, control method comprises the following steps: the ammonia nitrogen concentration signal gathering described membrane cisterna; Obtain the first residual values between described ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value; Obtained the dissolved oxygen preset concentration value of described Aerobic Pond by the first rank PI algorithm according to described first residual values; Gather the dissolved oxygen concentration signal of described Aerobic Pond; Obtain the second residual values between described dissolved oxygen concentration signal and dissolved oxygen preset concentration value; Aerobic Pond aeration value is obtained by second-order PI algorithm according to described second residual values; And according to described Aerobic Pond aeration value and characteristic curve of fan, described multiple gas blower is controlled.
According to the control method of the MBR Aerobic Pond aeration that the embodiment of the present invention proposes, dissolved oxygen preset concentration value is obtained by the first rank PI algorithm, and obtain Aerobic Pond aeration value by second-order PI algorithm, thus according to Aerobic Pond aeration value and characteristic curve of fan, multiple gas blower is controlled, further contemplate the biochemical action of membrane cisterna, improve control accuracy, realize the automatic control to MBR biochemical treatment aeration process better, stablize effluent quality, reduce sewage disposal energy consumption, be simple and easy to realize.
In addition, the control method of MBR Aerobic Pond aeration according to the above embodiment of the present invention can also have following additional technical characteristic:
Further, in one embodiment of the invention, after the ammonia nitrogen concentration signal of the described membrane cisterna of described collection and the dissolved oxygen concentration signal of the described Aerobic Pond of described collection, also comprise: verify that whether described ammonia nitrogen concentration signal is effective according to the first preset range; Verify that whether described dissolved oxygen concentration signal is effective according to the second preset range.
Further, in one embodiment of the invention, obtain described dissolved oxygen preset concentration value according to following formula, described formula is:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH，
Wherein, Bias1, K p1and τ 1be respectively the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient, e_NH is described first residual values.
Further, in one embodiment of the invention, obtain described Aerobic Pond aeration value according to following formula, described formula is:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO，
Wherein, Q_air0 is described Aerobic Pond aeration value, Bias2, K p2and τ 2be respectively the 4th and preset system, the 5th default system and the 6th default system, e_DO is described second residual values.
Further, in one embodiment of the invention, aforesaid method also comprises: gather water yield flow signal; Perform corresponding water amount according to described water yield flow signal, water yield preset flow value, described ammonia nitrogen concentration signal and described ammonia nitrogen preset concentration value to compensate.
The present invention on the other hand embodiment proposes a kind of Controlling System of MBR Aerobic Pond aeration, and MBR comprises: membrane cisterna, Aerobic Pond and multiple gas blower, and wherein, Controlling System comprises: the first acquisition module, for gathering the ammonia nitrogen concentration signal of described membrane cisterna; First acquisition module, for obtaining the first residual values between described ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value; First computing module, for obtaining the dissolved oxygen preset concentration value of described Aerobic Pond by the first rank PI algorithm according to described first residual values; Second acquisition module, for gathering the dissolved oxygen concentration signal of described Aerobic Pond; Second acquisition module, for obtaining the second residual values between described dissolved oxygen concentration signal and dissolved oxygen preset concentration value; Second computing module, for obtaining Aerobic Pond aeration value according to described second residual values by second-order PI algorithm; And control module, for controlling described multiple gas blower according to described Aerobic Pond aeration value and characteristic curve of fan.
According to the Controlling System of the MBR Aerobic Pond aeration that the embodiment of the present invention proposes, dissolved oxygen preset concentration value is obtained by the first rank PI algorithm, and obtain Aerobic Pond aeration value by second-order PI algorithm, thus according to Aerobic Pond aeration value and characteristic curve of fan, multiple gas blower is controlled, further contemplate the biochemical action of membrane cisterna, improve control accuracy, realize the automatic control to MBR biochemical treatment aeration process better, stablize effluent quality, reduce sewage disposal energy consumption, be simple and easy to realize.
In addition, the Controlling System of MBR Aerobic Pond aeration according to the above embodiment of the present invention can also have following additional technical characteristic:
Further, in one embodiment of the invention, said system also comprises: the first authentication module, for verifying that according to the first preset range whether described ammonia nitrogen concentration signal is effective; Second authentication module, for verifying that according to the second preset range whether described dissolved oxygen concentration signal is effective.
Further, in one embodiment of the invention, obtain described dissolved oxygen preset concentration value according to following formula, described formula is:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH，
Wherein, Bias1, K p1and τ 1be respectively the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient, e_NH is described first residual values.
Further, in one embodiment of the invention, obtain described Aerobic Pond aeration value according to following formula, described formula is:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO，
Wherein, Q_air0 is described Aerobic Pond aeration value, Bias2, K p2and τ 2be respectively the 4th predetermined coefficient, the 5th predetermined coefficient and the 6th predetermined coefficient, e_DO is described second residual values.
Further, in one embodiment of the invention, said system also comprises: the 3rd acquisition module, for gathering water yield flow signal; Compensating module, compensates for performing corresponding water amount according to described water yield flow signal, water yield preset flow value, described ammonia nitrogen concentration signal and described ammonia nitrogen preset concentration value.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schema of the control method of MBR Aerobic Pond aeration according to the embodiment of the present invention;
Fig. 2 is the schema of the control method of MBR Aerobic Pond aeration according to an embodiment of the invention;
Fig. 3 is the structural representation of the Controlling System of MBR Aerobic Pond aeration according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature immediately below second feature and tiltedly below, or only represent that fisrt feature level height is less than second feature.
Describe control method and the Controlling System of the MBR Aerobic Pond aeration proposed according to the embodiment of the present invention with reference to the accompanying drawings, describe the control method of the MBR Aerobic Pond aeration proposed according to the embodiment of the present invention first with reference to the accompanying drawings.Wherein, MBR comprises: membrane cisterna, Aerobic Pond and multiple gas blower, and with reference to shown in Fig. 1, this control method comprises the following steps:
S101, gathers the ammonia nitrogen concentration signal of membrane cisterna.
In one embodiment of the invention, the embodiment of the present invention can gather ammonia nitrogen concentration signal by online ammonia nitrogen concentration instrument.
S102, obtains the first residual values between ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value.
Wherein, in an embodiment of the present invention, ammonia nitrogen preset concentration value and ammonia nitrogen set(ting)value can set according to practical situation.
S103, obtains the dissolved oxygen preset concentration value of Aerobic Pond by the first rank PI algorithm according to the first residual values.
Further, in one embodiment of the invention, obtain dissolved oxygen preset concentration value according to following formula, formula is:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH，
Wherein, Bias1, K p1and τ 1be respectively the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient, e_NH is the first residual values.
Wherein, the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient can be determined by debugging.
S104, gathers the dissolved oxygen concentration signal of Aerobic Pond.
In one embodiment of the invention, the embodiment of the present invention can gather dissolved oxygen concentration signal by online dissolved oxygen concentration instrument.
In a preferred embodiment of the invention, after the dissolved oxygen concentration signal of the ammonia nitrogen concentration signal and collection Aerobic Pond that gather membrane cisterna, also comprise: whether effective according to the first preset range checking ammonia nitrogen concentration signal; Whether effective according to the second preset range checking dissolved oxygen concentration signal.
Particularly, the first preset range and the second preset range can be all the numerical range of artificial setting, thus judge the quality of data according to the numerical range of artificial setting, namely verify the ammonia nitrogen concentration signal gathered and dissolved oxygen concentration signal.
S105, obtains the second residual values between dissolved oxygen concentration signal and dissolved oxygen preset concentration value.
S106, obtains Aerobic Pond aeration value according to the second residual values by second-order PI algorithm.
Further, in one embodiment of the invention, obtain Aerobic Pond aeration value according to following formula, formula is:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO，
Wherein, Q_air0 is Aerobic Pond aeration value, Bias2, K p2and τ 2be respectively the 4th predetermined coefficient, the 5th predetermined coefficient and the 6th predetermined coefficient, e_DO is the second residual values.
Wherein, the 4th predetermined coefficient, the 5th predetermined coefficient and the 6th predetermined coefficient can be determined by debugging.
S107, controls multiple gas blower according to Aerobic Pond aeration value and characteristic curve of fan.
Particularly, calculate the total aperture of required blower fan by aeration rate and Aerobic Pond aeration value and characteristic curve of fan, and complete the adjustment to gas blower action according to total aperture of described blower fan.
Further, in one embodiment of the invention, the control method of the embodiment of the present invention also comprises: gather water yield flow signal; Perform corresponding water amount according to water yield flow signal, water yield preset flow value, ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value to compensate.
In one embodiment of the invention, the embodiment of the present invention can arrange flow instrument by feed-water end and gather water yield flow signal.
Should be understood that the setting of step S101 to step S107 only for convenience of description, and be not used in the execution sequence of method for limiting.
In one particular embodiment of the present invention, MBR comprises: biological treatment and separating unit (Aerobic Pond and membrane cisterna), intake in-line meter, central controller, gas blower and controller thereof.Wherein, online ammonia nitrogen concentration instrument and online dissolved oxygen concentration instrument are set in biological treatment and separating unit, and flow instrument is set at feed-water end.The data that these in-line meters monitor transfer to central controller by looped network; and export control signal after calculating according to specific algorithm; secondly control signal transfers to blower control through looped network, the number regulating blower fan to open/shut down by blower control, the guide vane opening of each blower fan.
Particularly, central controller comprises feedback tandem PI control module and Front feedback control module.First feedback module gathers the numerical value of the online ammonia nitrogen concentration instrument monitoring of membrane cisterna, and judges the quality of data according to the numerical range of artificial setting; Calculate the residual error of itself and ammonia nitrogen set(ting)value subsequently, and residual error calculates the set(ting)value of Aerobic Pond dissolved oxygen concentration by the first rank PI algorithm accordingly.Secondly, feedback module gathers the numerical value of the online dissolved oxygen concentration instrument monitoring of Aerobic Pond, and judges the quality of data according to the numerical range of artificial setting; Calculate the residual error of the set(ting)value that itself and the first rank PI algorithm calculate subsequently, and residual error calculates Aerobic Pond aeration rate by second-order PI algorithm accordingly.Finally, aeration rate and characteristic curve of fan calculate the total aperture of required blower fan thus, and transfer to blower control by looped network, complete the adjustment to gas blower action by it.
Preferably, amount of inlet water instrument can adopt magnetic flow meter, and online ammonia nitrogen concentration instrument can adopt the online ammonia nitrogen instrument of ion selective electrode method, and online dissolved oxygen concentration instrument can adopt the online dissolved oxygen instrument of dissolved oxygen electrode method.
In an embodiment of the present invention, control process comprises the following steps:
S1, obtains online ammonia nitrogen concentration NH_RT from membrane cisterna online ammonia nitrogen concentration instrument, and verifies whether its numerical value is in useful range, afterwards, calculate the residual error e_NH between itself and ammonia nitrogen concentration set(ting)value NH_setpoint:
e_NH＝NH_setpoint-NH_RT。
S2, according to e_NH, by the first rank PI algorithm, calculates the set(ting)value DO_setpoint of dissolved oxygen concentration:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH。
S3, obtains online dissolved oxygen concentration DO_RT from Aerobic Pond online dissolved oxygen concentration instrument, and verifies whether its numerical value is in useful range, afterwards, calculate the residual error e_DO of calculation result DO_setpoint in itself and S2:
e_DO＝DO_setpoint-DO_RT。
S4, according to e_DO, by second-order PI algorithm, calculates Aerobic Pond aeration rate Q_air0:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO。
S5, obtains online water yield data from amount of inlet water instrument, calculates itself and design discharge Q designresidual error, when actual flooding velocity higher than design discharge and online ammonia nitrogen concentration higher than ammonia nitrogen set(ting)value, or actual flooding velocity lower than design discharge and online ammonia nitrogen concentration lower than set(ting)value time, perform flooding velocity and compensate Q_airoffset:
e_influent＝Q design-Q influent，
Q _ a i r o f f s e t = 0 e _ inf l u e n t &CenterDot; e _ N H < 0 K a i r &CenterDot; ( Q inf l u e n t / Q d e s i g n - 1 ) e _ inf l u e n t &CenterDot; e _ N H > 0 ,
Q_air＝Q_air0+Q_airoffset，
Wherein, NH_setpoint, Q designfor artificial set(ting)value, by decisions such as Practical Project parameter, operating requirements; Bias1, K p1, τ 1, Bias2, K p2, τ 2, K airfor coefficient, determined by debugging; NH_RT, DO_RT, Q influentfor control algolithm input, obtained by each in-line meter.
In an embodiment of the present invention, the embodiment of the present invention can realize the feedback-feedforward comprehensive adjustment of aerating system, under the prerequisite of stable effluent quality, realizes the automatic control of Aerobic Pond aeration rate, completes the Comprehensive Control of feedback tandem and feedforward compensation.
Referring to Fig. 2, be described in detail with a specific embodiment.
In one particular embodiment of the present invention, with reference to shown in Fig. 2, wherein instrument comprises: online ammonia nitrogen instrument 1, online dissolved oxygen instrument 2, feed water flow gauge 11; Central controller comprises: ammonia nitrogen residual computations device 3, NH-DOPI controller 4, dissolved oxygen residual computations device 5, DO-aeration PI controller 6, amount of inlet water compensating feedforward controller 7; Biochemical reaction unit comprises: membrane cisterna 8, Aerobic Pond 9; Motor unit is gas blower and controller 10 thereof.
Referring to accompanying drawing, introduce the control method of the embodiment of the present invention in detail, comprise the following steps:
(1) from 0 moment, every 2min is from membrane cisterna 8 and Aerobic Pond 9, online ammonia nitrogen concentration NH_RT and online dissolved oxygen concentration DO_RT is obtained by online ammonia nitrogen instrument 1 and online dissolved oxygen meter 2, if there is multiple in-line meter, then chooses effective data results (useful range can manually set) and average;
(2) by ammonia nitrogen residual computations device 3, calculate ammonia nitrogen concentration residual error e_NH, calculation formula is as follows:
e_NH＝NH_setpoint-NH_RT
Wherein, NH_setpoint is ammonia nitrogen concentration reference mark, is artificial set(ting)value, is determined by the operating requirement of Practical Project;
(3) the every 30min computing of NH-DOPI controller 4 is once, and calculation formula is as follows:
DO_setpoint＝Bias1+K p1·e_NH+Kp 1/τ 1·∫e_NH
Wherein, the left side DO_setpoint of formula is that controller exports, the right Section 1 is the initial output of NH-DOPI controller 4, the right Section 2 is that ratio control exports, the right Section 3 is integral control output (wherein integral is the e_NH sum total of all calculating in 30min), Bias1, K p1, τ 1for controller coefficient, determined by debugging;
(4) by dissolved oxygen residual computations device 5, calculate dissolved oxygen concentration residual error e_DO, calculation formula is as follows:
e_DO＝DO_setpoint-DO_RT
Wherein, DO_setpoint is Dissolved Oxygen concentration Control point, calculates output by NH-DOPI controller 4;
(5) the every 30min computing of DO-aeration PI controller 6 is once, and calculation formula is as follows:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO
Wherein, the left side Q_air0 of formula is that controller exports, and the right Section 1 is the initial output of DO-aeration PI controller 6, and the right Section 2 is that ratio control exports, the right Section 3 is integral control output (wherein integral is the e_DO sum total of all calculating in 30min), Bias2, K p2, τ 2for controller coefficient, determined by debugging;
(6) the every 30min computing of amount of inlet water compensating feedforward controller 7 is once, and calculation formula is as follows:
e_influent＝Q design-Q influent
Q _ a i r o f f s e t = 0 e _ inf l u e n t &CenterDot; e _ N H < 0 K a i r &CenterDot; ( Q inf l u e n t / Q d e s i g n - 1 ) e _ inf l u e n t &CenterDot; e _ N H > 0
Flooding velocity Q is obtained from feed water flow gauge 11 influent, calculate itself and design discharge Q designresidual error e_influent, when this residual error and ammonia nitrogen concentration residual error e_NH jack per line (ammonia nitrogen concentration residual error and flooding velocity residual error are in the same way for the change demand of aeration rate), the output of feedforward controller 7 is K air(Q influent/ Q design-1), no side, the output of feed forward control 7 is 0, wherein K airfor controller coefficient, determined by debugging;
(7) output of DO-aeration PI controller 6 and amount of inlet water compensating feedforward controller 7 is added, obtains the output Q_air of final controller:
Q_air＝Q_air0+Q_airoffset
Q_air transfers to gas blower 10, is converted into guide-vane for fan opening amount signal according to the working curve in blast blower control system, and regulates the opening/closing number of units of blower fan, the guide vane opening of each blower fan within the specific limits.
Wherein, online ammonia nitrogen instrument 1 can adopt the online ammonia nitrogen instrument of ion selective electrode method, and online dissolved oxygen instrument 2 can adopt the online dissolved oxygen instrument of dissolved oxygen electrode method, and feed water flow gauge 11 can adopt magnetic flow meter.
In addition, in one embodiment of the invention, the embodiment of the present invention also contemplates the automatic switchover of the control algolithm according to in-line meter signal quality: when feed water flow gauge, online ammonia nitrogen instrument, online dissolved oxygen instrument all normally work, perform second order tandem PI control+Front feedback control; When feed water flow gauge goes wrong, cancel Front feedback control; When online ammonia nitrogen instrument goes wrong, cancel the first rank PI and control, the dissolved oxygen concentration setting point DO_setpoint that now second-order PI controls is fixed value Bias1; When online dissolved oxygen instrument goes wrong, cancel second order tandem PI to control, Q_air0 is fixed value Bias2, thus solve the normal work needing to rely on in-line meter, and due to in-line meter Working environment in actual sewage factory comparatively severe, the problem of the requirement that signal quality does not meet or not exclusively meets may be there is.
In one embodiment of the invention, Sewage Plant adopts improvement AAO-MBR technique, and scale is 50000m 3/ d, improvement AAO is divided into 4 series, and film separating system is divided into 12 membrane cisternas, arranges 2 online ammonia nitrogen instrument, 4 online dissolved oxygen instruments, 1 feed water flow gauge altogether.Adopt second order tandem PI+ Front feedback control: in NH-DOPI control process, Bias1=1.5mgDO/L, K p1=-2 (mgDO/L)/(mgN/L), τ 1=30min; In DO-aeration PI control process, Bias2=8800m 3/ h, K p2=350 (m 3/ h)/(mgDO/L), τ 2=15min; In amount of inlet water feedforward compensation controller, Q design=50000m 3/ d, K air=8000m 3/ h.By the analog calculation on prototype software, can NH_setpoint=2.5mg/L be set in summer, run relative to conventional constant aeration rate, aeration rate about 30% can be saved; Set NH_setpoint=3.5mg/L in the winter time, run relative to constant aerating amount, aeration rate about 20% can be saved.
According to the control method of the MBR Aerobic Pond aeration that the embodiment of the present invention proposes, dissolved oxygen preset concentration value is obtained by the first rank PI algorithm, and obtain Aerobic Pond aeration value by second-order PI algorithm, thus according to Aerobic Pond aeration value and characteristic curve of fan, multiple gas blower is controlled, and adopt the Comprehensive Control of feedback tandem and feedforward compensation, realize the feedback-feedforward comprehensive adjustment of aerating system, further contemplate the biochemical action of membrane cisterna, improve control accuracy, realize the automatic control to MBR biochemical treatment aeration process better, stablize effluent quality, reduce sewage disposal energy consumption, be simple and easy to realize.
Next describes the Controlling System of the MBR Aerobic Pond aeration proposed according to the embodiment of the present invention with reference to the accompanying drawings.MBR comprises: membrane cisterna, Aerobic Pond and multiple gas blower, with reference to shown in Fig. 3, this Controlling System 10 comprises: the first acquisition module 100, first acquisition module 200, first computing module 300, second acquisition module 400, second acquisition module 500, second computing module 600 and control module 700.
Wherein, the first acquisition module 100 is for gathering the ammonia nitrogen concentration signal of membrane cisterna.First acquisition module 200 is for obtaining the first residual values between ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value.First computing module 300 is for obtaining the dissolved oxygen preset concentration value of Aerobic Pond by the first rank PI algorithm according to the first residual values.Second acquisition module 400 is for gathering the dissolved oxygen concentration signal of Aerobic Pond.Second acquisition module 500 is for obtaining the second residual values between dissolved oxygen concentration signal and dissolved oxygen preset concentration value.Second computing module 600 is for obtaining Aerobic Pond aeration value according to the second residual values by second-order PI algorithm.Control module 700 is for controlling multiple gas blower according to Aerobic Pond aeration value and characteristic curve of fan.The Controlling System 10 of the embodiment of the present invention further contemplates the biochemical action of membrane cisterna, improves control accuracy, realizes the automatic control to MBR biochemical treatment aeration process better, stablizes effluent quality, reduces sewage disposal energy consumption.
Wherein, in one embodiment of the invention, the Controlling System 10 of the embodiment of the present invention also comprises: the first authentication module (specifically not indicating in figure) and the second authentication module (specifically not indicating in figure).Wherein, whether the first authentication module is used for according to the first preset range checking ammonia nitrogen concentration signal effective; Whether the second authentication module is used for according to the second preset range checking dissolved oxygen concentration signal effective.
Further, in one embodiment of the invention, obtain dissolved oxygen preset concentration value according to following formula, formula is:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH，
Wherein, Bias1, K p1and τ 1be respectively the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient, e_NH is the first residual values.
Further, in one embodiment of the invention, obtain Aerobic Pond aeration value according to following formula, formula is:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO，
Wherein, Q_air0 is Aerobic Pond aeration value, Bias2, K p2and τ 2be respectively the 4th predetermined coefficient, the 5th predetermined coefficient and the 6th predetermined coefficient, e_DO is the second residual values.
In addition, in one embodiment of the invention, the Controlling System 10 of the embodiment of the present invention also comprises: the 3rd acquisition module (specifically not indicating in figure) and compensating module (specifically not indicating in figure).Wherein, the 3rd acquisition module is for gathering water yield flow signal.Compensating module is used for performing corresponding water amount according to water yield flow signal, water yield preset flow value, ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value and compensates.
Should be understood that the specific implementation process of the Controlling System of the MBR Aerobic Pond aeration according to the embodiment of the present invention can be identical with the workflow of the control method of the MBR Aerobic Pond aeration of the embodiment of the present invention, be no longer described in detail herein.
According to the Controlling System of the MBR Aerobic Pond aeration that the embodiment of the present invention proposes, dissolved oxygen preset concentration value is obtained by the first rank PI algorithm, and obtain Aerobic Pond aeration value by second-order PI algorithm, thus according to Aerobic Pond aeration value and characteristic curve of fan, multiple gas blower is controlled, and adopt the Comprehensive Control of feedback tandem and feedforward compensation, realize the feedback-feedforward comprehensive adjustment of aerating system, further contemplate the biochemical action of membrane cisterna, improve control accuracy, realize the automatic control to MBR biochemical treatment aeration process better, stablize effluent quality, reduce sewage disposal energy consumption, be simple and easy to realize.
Describe and can be understood in schema or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of treater or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification sheets, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only storage (ROM), erasablely edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk read-only storage (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanning to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer memory.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data signal, there is the application specific integrated circuit of suitable combinational logic gating circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage media mentioned can be read-only storage, disk or CD etc.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention when not departing from principle of the present invention and aim, revising, replacing and modification.

Claims (10)

1. a control method for MBR Aerobic Pond aeration, is characterized in that, membrane bioreactor MBR comprises membrane cisterna, Aerobic Pond and multiple gas blower, and wherein, control method comprises the following steps:
Gather the ammonia nitrogen concentration signal of described membrane cisterna;
Obtain the first residual values between described ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value;
Obtained the dissolved oxygen preset concentration value of described Aerobic Pond by the first rank PI algorithm according to described first residual values;
Gather the dissolved oxygen concentration signal of described Aerobic Pond;
Obtain the second residual values between described dissolved oxygen concentration signal and dissolved oxygen preset concentration value;
Aerobic Pond aeration value is obtained by second-order PI algorithm according to described second residual values; And
According to described Aerobic Pond aeration value and characteristic curve of fan, described multiple gas blower is controlled.
2. the control method of MBR Aerobic Pond aeration according to claim 1, is characterized in that, after the ammonia nitrogen concentration signal of the described membrane cisterna of described collection and the dissolved oxygen concentration signal of the described Aerobic Pond of described collection, also comprises:
Verify that whether described ammonia nitrogen concentration signal is effective according to the first preset range;
Verify that whether described dissolved oxygen concentration signal is effective according to the second preset range.
3. the control method of MBR Aerobic Pond aeration according to claim 1, is characterized in that, obtain described dissolved oxygen preset concentration value according to following formula, described formula is:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH，
Wherein, Bias1, K p1and τ 1be respectively the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient, e_NH is described first residual values.
4. the control method of MBR Aerobic Pond aeration according to claim 3, is characterized in that, obtain described Aerobic Pond aeration value according to following formula, described formula is:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO，
Wherein, Q_air0 is described Aerobic Pond aeration value, Bias2, K p2and τ 2be respectively the 4th predetermined coefficient, the 5th predetermined coefficient and the 6th predetermined coefficient, e_DO is described second residual values.
5. the control method of MBR Aerobic Pond aeration according to claim 1, is characterized in that, also comprise:
Gather water yield flow signal;
Perform corresponding water amount according to described water yield flow signal, water yield preset flow value, described ammonia nitrogen concentration signal and described ammonia nitrogen preset concentration value to compensate.
6. a Controlling System for MBR Aerobic Pond aeration, is characterized in that, MBR comprises: membrane cisterna, Aerobic Pond and multiple gas blower, and wherein, Controlling System comprises:
First acquisition module, for gathering the ammonia nitrogen concentration signal of described membrane cisterna;
First acquisition module, for obtaining the first residual values between described ammonia nitrogen concentration signal and ammonia nitrogen preset concentration value;
First computing module, for obtaining the dissolved oxygen preset concentration value of described Aerobic Pond by the first rank PI algorithm according to described first residual values;
Second acquisition module, for gathering the dissolved oxygen concentration signal of described Aerobic Pond;
Second acquisition module, for obtaining the second residual values between described dissolved oxygen concentration signal and dissolved oxygen preset concentration value;
Second computing module, for obtaining Aerobic Pond aeration value according to described second residual values by second-order PI algorithm; And
Control module, for controlling described multiple gas blower according to described Aerobic Pond aeration value and characteristic curve of fan.
7. the Controlling System of MBR Aerobic Pond aeration according to claim 6, is characterized in that, also comprise:
First authentication module, for verifying that according to the first preset range whether described ammonia nitrogen concentration signal is effective;
Second authentication module, for verifying that according to the second preset range whether described dissolved oxygen concentration signal is effective.
8. the Controlling System of MBR Aerobic Pond aeration according to claim 6, is characterized in that, obtain described dissolved oxygen preset concentration value according to following formula, described formula is:
DO_setpoint＝Bias1+K p1·e_NH+K p1/τ 1·∫e_NH，
Wherein, Bias1, K p1and τ 1be respectively the first predetermined coefficient, the second predetermined coefficient and the 3rd predetermined coefficient, e_NH is described first residual values.
9. the Controlling System of MBR Aerobic Pond aeration according to claim 8, is characterized in that, obtain described Aerobic Pond aeration value according to following formula, described formula is:
Q_air0＝Bias2+K p2·e_DO+K p2/τ 2·∫e_DO，
Wherein, Q_air0 is described Aerobic Pond aeration value, Bias2, K p2and τ 2be respectively the 4th and preset system, the 5th default system and the 6th default system, e_DO is described second residual values.
10. the Controlling System of MBR Aerobic Pond aeration according to claim 6, is characterized in that, also comprise:
3rd acquisition module, for gathering water yield flow signal;
Compensating module, compensates for performing corresponding water amount according to described water yield flow signal, water yield preset flow value, described ammonia nitrogen concentration signal and described ammonia nitrogen preset concentration value.
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