CN100506720C - Urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device - Google Patents
Urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device Download PDFInfo
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- CN100506720C CN100506720C CNB2008101008058A CN200810100805A CN100506720C CN 100506720 C CN100506720 C CN 100506720C CN B2008101008058 A CNB2008101008058 A CN B2008101008058A CN 200810100805 A CN200810100805 A CN 200810100805A CN 100506720 C CN100506720 C CN 100506720C
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a stable intelligent control method and a device of dissolved oxygen in an aeration tank of an urban wastewater treatment plant in a technical field of environment protection. An air supply loop of the aeration tank is connected with a fan and air supply main pipes. An aeration area is divided into four sub-areas, each of which adopts a separate air supply main pipe for air supplying; each air supply main pipe has an electric valve; each sub-area has a determinator of dissolved oxygen; the system can realize the intelligent feedback control of the dissolved oxygen and the electric valve on the programmable controller. The stable intelligent control method and the device suitable for the water quality and amount change of water entering the urban wastewater treatment plant and keep stable concentration of dissolved oxygen in the aeration tank. According to the changing rule of measured value of gas flowmeters arranged on each air supply main pipe, the comprehensive result of water quality and amount change of the water entering the wastewater treatment plant can be reflected, thus decreasing the energy consumption of aeration cells and saving the operation expense of the aeration cells.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device thereof.
Background technology
In current sewage treatment area, activated sludge process is one of treatment process that is most widely used, this technology is core processing equipment with the aeration tank, under the aeration effect, the aeration tank mixed solution obtains enough oxygen and makes the microbiological degradation dissolved organic matter of survival on active sludge, and sewage is purified.Wherein, the height of dissolved oxygen concentration directly influences organic removal efficient in the aeration tank, and in the activated sludge process sewage treatment process, influence the growth of active sludge, also be the important factor that influences working cost and effluent quality simultaneously, so be the important control parameter of process control at the dissolved oxygen concentration in service of Wastewater Treated by Activated Sludge Process system.Under the different operating modes of sewage treatment process (as: amount of inlet water water quality changes, changing of airing system pipe Hair Fixer, envrionment temperature change etc.), the aperture of the valve on each section of aeration tank branch steam line is carried out effectively regulating fast, keep the stable of dissolved oxygen, the process control of technology and the energy consumption of reduction aeration unit are of great immediate significance.
Formerly in the technology, great majority are that the aerating system of the municipal wastewater treatment plant of treatment process has adopted simple control loop to control automatically or manually control on the spot with the activated sludge process.Simple control loop has adopted PID (proportional-integral-differential) to regulate control, dissolved oxygen determination value and dissolved oxygen set(ting)value according to dissolved oxygen detector in the aeration tank compare, with the aperture signal of both deviations by output electrically operated valve after the PID computing, journey controller by valve carries out corresponding adjusting then, and then the dissolved oxygen concentration in the control pond; Manually control the variance analysis to current technology running condition and dissolved oxygen determination value and set(ting)value on the spot, rule of thumb artificially valve opening is regulated by operator, thus the dissolved oxygen concentration in the control pond.The shortcoming of the above-mentioned control method of technology formerly is: the one, because time lag, i.e. the measured value variation that is adjusted to dissolved oxygen in the pond from valve opening needs for some time, causes the control lag of dissolved oxygen, thereby causes fluctuation; The 2nd, the existing regulated valve in the Sewage Plant generally all is non-linear, and aeration rate is nonlinearities change with valve opening, uses simple PID control to cause the vibration of dissolved oxygen concentration easily; The 3rd, manually operated effect and operator's experience has confidential relation, and the reliability of control is lower, is easy to generate the situation of accommodative excess, causes the fluctuation of dissolved oxygen concentration; The 4th, the aeration energy consumption height of above-mentioned method, this is that the dissolved oxygen concentration fluctuation range is bigger down because aforesaid method is regulated, in order to guarantee the safe operation of technology, the dissolved oxygen set(ting)value of system can only remain on the higher numerical value, keep excessive redundancy and caused the increase of aeration rate, thereby increase the energy consumption of aeration unit: the 5th, the fluctuation range conference of dissolved oxygen concentration influences microbial growth breeding in the aeration tank, operation to sewage treatment process causes interference, thereby influences effluent quality.
Summary of the invention
The purpose of this invention is to provide a kind of urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device thereof, it is characterized in that: gas blower is connected on by the air feed main on the air feed loop of aeration tank, and the air feed loop both sides at middle part respectively connect first gas manifold, second gas manifold and the 3rd gas manifold, the 4th gas manifold in the aeration tank; First electrically operated valve, second electrically operated valve, the 3rd electrically operated valve, the 4th electrically operated valve that on each gas manifold, connect reference numeral; First dissolved oxygen meter, second dissolved oxygen meter, the 3rd dissolved oxygen meter, the 4th dissolved oxygen meter and first gas meter, second gas meter, the 3rd gas meter, the 4th gas meter; Be provided with water-in and water outlet at the aeration tank left end, programmable controller be installed at the aeration tank right-hand member.
Urban sewage plant aeration tank dissolved oxygen stable intelligent control method is:
(1) when the influent quality of aeration tank is relative with the water yield when stablizing, the air capacity kept stable that each segmentation needs in the aeration tank, by fine setting to each segmentation valve, resist in the aerating system because of pipe and press or the variation of the aeration rate that flow rate fluctuation causes, the sequence of control that is built on the programmable controller is analyzed by current measured value and 10 minutes mean variation trend that each segmentation dissolved oxygen meter is measured, thereby keeps the stable of aeration rate; Simultaneously, according to the Changing Pattern of dissolved oxygen at longer historical time, adjusting to valve is further revised, make the variation tendency of aeration rate can resist the variation tendency of dissolved oxygen concentration just, promptly dissolve the oxygen concentration determination value when being lower than set(ting)value, increase valve opening slightly, make aeration rate increase slightly, thereby make dissolved oxygen concentration raise; When the dissolved oxygen concentration measured value is higher than set(ting)value, reduce valve opening slightly, make aeration rate reduce slightly, thereby make dissolved oxygen concentration reduce; Specifically when the absolute value of the difference of dissolved oxygen concentration measured value and set(ting)value during less than 0.1mg/L, valve opening does not change, and this is because too frequent valve regulated can cause dissolved oxygen concentration to vibrate.
(2) when relatively large variation takes place in the influent quality of aeration tank and the water yield, the air capacity that each segmentation needs in the aeration tank will change successively according to the order of current process substantially, and the monitoring equipment in the segmentation of close water-in will monitor the variation tendency of this section dissolved oxygen concentration, valve opening and aeration rate very soon.According to these variation tendencies, regulated quantity to valve opening is set, when the mean value of dissolved oxygen concentration reduces when regulating preceding 10 minutes aeration rate mean value to increase, the processing load that this section is described increases, the air capacity deficiency of actual needs, the aperture of valve increases fast, thereby makes aeration rate increase the downtrending that slows down dissolved oxygen concentration; When the mean value of dissolved oxygen concentration increases when regulating preceding 10 minutes aeration rate mean value to reduce, the processing load that this section is described reduces, the air capacity surplus of actual needs, the aperture of valve reduces fast, thereby aeration rate is reduced, slow down the ascendant trend of dissolved oxygen concentration, specifically, in order to prevent that this inflation method from causing the fluctuation of dissolved oxygen, the each stepping adjustable value of valve is 5% to the maximum, so just can avoid because the periodic swinging of the excessive aeration rate that causes of valve regulated amplitude helps keeping the aeration tank dissolved oxygen steady concentration.
Described dissolved oxygen concentration in the steady time section, in the aeration tank each segmentation should set(ting)value ± 0.1～0.5mg/L in.
Beneficial effect of the present invention:
The stable control of dissolved oxygen concentration is the prerequisite that improves the biochemical unit of municipal wastewater treatment plant operational efficiency, maintenance sewage effluents water quality reaching standard, reduces the aerating system energy consumption in the aeration tank.Formerly the control method in the technology can not be implemented in the process that Sewage Plant amount of inlet water and water quality changes constantly, keeps the aeration tank dissolved oxygen steady concentration, thereby influence the processing efficiency of Sewage Plant, the energy consumption of increase aerating system.The present invention can adapt to the variation of Sewage Plant amount of inlet water and water quality, keeps the stable of dissolved oxygen concentration in the aeration tank, to the operation of Sewage Plant stability and safety with reduce system energy consumption unusual effect is all arranged.
Description of drawings
Fig. 1 is a urban sewage plant aeration tank dissolved oxygen stable intelligence controlling device synoptic diagram.
Among Fig. 1, the 1-gas blower, 2-air feed main, the 3-water inlet, the 4-water outlet, the 5-programmable controller, 6-first gas manifold, 7-second gas manifold, 8-the 3rd gas manifold, 9-the 4th gas manifold, 10-first dissolved oxygen meter, 11-second dissolved oxygen meter, 12-the 3rd dissolved oxygen meter, 13-the 4th dissolved oxygen meter, 14-first electrically operated valve, 15-second electrically operated valve, 16-the 3rd electrically operated valve, 17-the 4th electrically operated valve, 18-first gas meter, 19-second gas meter, 20-the 3rd gas meter, 21-the 4th gas meter, the 22-aeration tank.
Fig. 2 is that dissolved oxygen concentration pursues minute variation tendency comparison diagram in the specific embodiment.
Among Fig. 2, dissolved oxygen concentration change curve, 3-control back dissolved oxygen concentration change curve before 1-dissolved oxygen concentration set(ting)value curve, the 2-control.
Embodiment
The invention provides a kind of urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device thereof.In urban sewage plant aeration tank dissolved oxygen stable intelligence controlling device shown in Figure 1, gas blower 1 is connected on by air feed main 2 on the air feed loop of aeration tank 22, and the air feed loop both sides at middle part respectively connect first gas manifold 6, second gas manifold 7 and the 3rd gas manifold 8, the 4th gas manifold 9 in aeration tank 22; First electrically operated valve 14, second electrically operated valve 15, the 3rd electrically operated valve 16, the 4th electrically operated valve 17 that on each gas manifold, connect reference numeral; First dissolved oxygen meter 10, second dissolved oxygen meter 11, the 3rd dissolved oxygen meter 12, the 4th dissolved oxygen meter 13 and first gas meter 18, second gas meter 19, the 3rd gas meter 20, the 4th gas meter 21; 22 left ends are provided with water-in 3 and water outlet 4 in the aeration tank, and 22 right-hand members are installed programmable controller 5, the Sewage Plant blast aeration unit of composition in the aeration tank.
Municipal wastewater treatment plant is according to the aeration rate Changing Pattern of each section of aeration tank, the dynamic adjustments valve opening, and according to the adjusting trend of the variation tendency correction valve of dissolved oxygen concentration in the aeration tank, thereby make dissolved oxygen concentration keep stable, specific as follows: (1) is in time period that amount of inlet water and water quality keep relative stability, system is by the measured value of gas meter on dissolved oxygen concentration in the aeration tank and each gas manifold, electrically operated valve is finely tuned, to offset subtle change owing to aeration tank mesophytization reaction conditions, the variation and the vibration of dissolved oxygen concentration in the aeration tank that the factors such as interference of effluent flow rate cause in small sample perturbations that the air feed tube-in-tube is pressed and the aeration tank, by field observation to this specific embodiment
(2) time period of bigger variation takes place in amount of inlet water and water quality, particularly after the running status of the water inlet pump house of Sewage Plant was adjusted, the significant variation can take place later at several hrs in the amount of inlet water of aeration tank.The needed air capacity in each subarea, aeration tank will change successively according to the order of current process, and system will regulate accordingly according to the Changing Pattern of each section gas meter measured value, to keep the stable of dissolved oxygen concentration as far as possible.By field observation to this specific embodiment, the dissolved oxygen concentration in each subarea this section period be stabilized in set(ting)value separately ± 0.4mg/L, the fluctuation range of dissolved oxygen concentration is more bigger than first kind of situation, and this mainly is that noticeable change by the aeration tank water quality treatment water yield causes.
Below in conjunction with control device shown in Figure 1, concrete control process is described, when the water quality of the water inlet 3 of aeration tank 22 is relative with the water yield when stablizing, the air capacity kept stable that each segmentation biochemical reaction needs in the aeration tank 22, the sequence of control that is built on the programmable controller 5 is analyzed by currency and 10 minutes mean variation trend to the measured value of each segmentation dissolved oxygen meter, respectively each electrically operated valve is finely tuned, thereby keep the stable aeration rate of each gas manifold.
When relatively large variation takes place in the water quality of the water-in 3 of aeration tank 22 and the water yield, the air capacity that each segmentation biochemical reaction needs in the aeration tank 22 will change successively according to the order of current process, monitoring equipment first dissolved oxygen meter 10 in the segmentation of the most close water-in 3 will monitor the variation of dissolved oxygen concentration very soon, in order to make dissolved oxygen keep stable, programmable controller 5 will be carried out step-wise adjustment to the valve opening of first electrically operated valve 14, thereby increase or reduce the aeration rate of first gas manifold 6, and the feedback of utilizing first gas meter 18 to regulate, to slow down the trend that reduces or increase of aeration tank 22 near the dissolved oxygen concentration of water-in 3.In the present invention, first electrically operated valve 14 was regulated once per 30 seconds, regulating step-length sets by experience according to the correlation parameter of the actual motion of aeration tank 22, can be after about 10 minutes the measured value of first gas meter 18 of first gas manifold 6 be adjusted to more stable level, after changing with the water quality of the water-in 3 that satisfies aeration tank 22 and the water yield, the actual demand of air feed zone microbial growth on the oxygen amount that first gas manifold 6 is responsible for.(second electrically operated valve 15 of other electrically operated valve in the aeration tank 22, the 3rd electrically operated valve 16, the regulative mode of the 4th electrically operated valve 17 is basic consistent with the regulative mode of first electrically operated valve 14, the key distinction is on the adjusting of follow-up electrically operated valve first gas manifold that the distance of reference range water-in 3 is closer variation tendency at the mean value of the measured value of the first preceding 10 minutes gas meter and first dissolved oxygen meter, thereby the water quality of the water-in 3 of reflection aeration tank 22 and the variation of the water yield, increase and minimizing situation according to the current processing load in aeration tank 22, regulate the electrically operated valve aperture, and utilize the gas meter on each gas manifold to feed back, thereby realize the aeration as required of each gas manifold, reach each dissolved oxygen meter (first dissolved oxygen meter 10 in the control aeration tank 22, second dissolved oxygen meter 11, the 3rd dissolved oxygen meter 12, the 4th dissolved oxygen meter 13) the stable effect of measured value.
Embodiment,
As objective for implementation, this aeration tank processing power is about 40,000m with the aeration tank of an actual motion of certain municipal wastewater treatment plant
3/ d, the long 95m in pond, projected depth 6.5m in the pond, wherein the aeration zone is divided into four subareas, the independent blast main air feed of DN300 is adopted in each subarea, on each blast main electrically operated valve is installed, dissolved oxygen meter has been installed in each subarea, and original system has been realized the PID feedback control of dissolved oxygen and electrically operated valve on programmable controller.Adopt method and apparatus of the present invention, transform on the existing system basis, at first on the blast main after each electrically operated valve gas meter is installed, next utilizes control method of the present invention to revise the sequence of control that has now on the programmable controller.After realizing actual aeration with tolerance dynamic change feedback, particular case as shown in Figure 2, Fig. 2 be in the present embodiment dissolved oxygen concentration by minute variation tendency comparison diagram.As can be seen from the figure, before the control method in not implementing the present invention, the deviation of dissolved oxygen concentration curve 2 distance setting value curves 1 is bigger, and particularly in 8:00 arrived the time period of 15:00, the actual concentrations of dissolved oxygen was higher than set(ting)value far away in the aeration tank; And after the control method in the embodiment of this invention, dissolved oxygen concentration curve 3 distance setting value curves 1 are nearer, and the deviation of the actual concentrations of dissolved oxygen and set(ting)value is in ± 0.5mg/L in the aeration tank.This is the variation of air demand when having considered not only that owing to present method load variations is handled in the aeration tank, and considered under the comparatively stable situation of load that aeration tank mesophytization reaction conditions, air feed tube-in-tube are pressed and the aeration tank in small interfering factors such as effluent flow rate, guaranteed the stable of dissolved oxygen concentration in the aeration tank.After adopting this course control method for use and installing, can utilize on the aerating system of blast aeration mode existing, rationally dispose a series of instrument and equipment, and can be according to the dynamic change of influent load, in time adjust the aperture of each aeration arm valve automatically, make aeration rate always can satisfy the needs of microorganism, reach the effect of " aeration, stabilization process, energy-saving and cost-reducing as required ".This system is by monitoring indexs such as the dissolved oxygen in the aeration tank, gas flow, valve openings, and the aperture of valve is automatically adjusted, the dissolved oxygen that guarantees the aeration tank can be stabilized in the actual set value ± the 0.3mg/L scope in.After adopting this control method, can solve formerly big, the problems such as the technology operational conditions changes greatly, aeration unit energy consumption height of aeration tank dissolved oxygen fluctuation of concentration scope in the technology.
Can draw the present invention from the foregoing description has the following advantages:
(1) aeration rate of each section of maintenance aeration tank can satisfy the needs of biochemical reaction, the steady running that keeps technology.The aperture of each electrically operated valve will rely on the currency and the variation tendency of the measured value of gas meter to regulate among the present invention, thereby make the aeration rate of each gas manifold can satisfy the needed air capacity of each section biochemical reaction in the current aeration tank just, help the growth and breeding of microbial population, thereby guarantee the steady running of biochemical cell process.
(2) adapt to the water quality of municipal wastewater treatment plant water inlet and the variation of the water yield, dissolved oxygen concentration is stable in the maintenance aeration tank.Basis is distributed in the Changing Pattern of gas meter measured value on each gas manifold among the present invention, the synthesis result that the reflection Sewage Plant influent quality and the water yield change, and regulate by the correction that the measured value of dissolved oxygen meter is carried out valve opening, even make under the situation of Sewage Plant influent quality and water yield generation acute variation, it is stable that dissolved oxygen concentration in the aeration tank still can keep, and measurement deviation is stabilized in set(ting)value ± 0.3mg/L.
(3) energy consumption of reduction aeration unit is saved the aeration unit working cost, and formerly technology is because the dissolved oxygen concentration in the control aeration tank that can not be stable moves and treatment effect in order to guarantee process stabilizing, and general employing improves the method for dissolved oxygen concentration set(ting)value; And the method among employing the present invention can reduce the set(ting)value of dissolved oxygen concentration, reduces the gaseous mass of gas blower actual fed, thereby reduces the energy consumption of aeration unit.
Claims (4)
1. urban sewage plant aeration tank dissolved oxygen stable intelligence controlling device, it is characterized in that: gas blower (1) is connected on by air feed main (2) on the air feed loop of aeration tank (22), and the air feed loop both sides at middle part respectively connect first gas manifold (6), second gas manifold (7) and the 3rd gas manifold (8), the 4th gas manifold (9) in aeration tank (22); First electrically operated valve (14), second electrically operated valve (15), the 3rd electrically operated valve (16), the 4th electrically operated valve (17) that on each gas manifold, connect reference numeral; First dissolved oxygen meter (10), second dissolved oxygen meter (11), the 3rd dissolved oxygen meter (12), the 4th dissolved oxygen meter (13) and first gas meter (18), second gas meter (19), the 3rd gas meter (20), the 4th gas meter (21); (22) left end is provided with water-in (3) and water outlet (4) in the aeration tank, and (22) right-hand member is installed programmable controller (5) in the aeration tank.
2. the described control device of claim 1 is characterized in that the stable intelligent control method of urban sewage plant aeration tank dissolved oxygen, to the stable intelligent control method of urban sewage plant aeration tank dissolved oxygen is:
1) when the influent quality of aeration tank is relative with the water yield when stablizing, the air capacity kept stable that each segmentation needs in the aeration tank, by fine setting to each segmentation valve, resist in the aerating system because of pipe and press or the variation of the aeration rate that flow rate fluctuation causes, the sequence of control that is built on the programmable controller is analyzed by current measured value and 10 minutes mean variation trend that each segmentation dissolved oxygen meter is measured, thereby keeps the stable of aeration rate; Simultaneously, according to the Changing Pattern of dissolved oxygen at longer historical time, adjusting to valve is further revised, make the variation tendency of aeration rate can resist the variation tendency of dissolved oxygen concentration just, promptly dissolve the oxygen concentration determination value when being lower than set(ting)value, increase valve opening slightly, make aeration rate increase slightly, thereby make dissolved oxygen concentration raise; When the dissolved oxygen concentration measured value is higher than set(ting)value, reduce valve opening slightly, make aeration rate reduce slightly, thereby make dissolved oxygen concentration reduce; Specifically when the absolute value of the difference of dissolved oxygen concentration measured value and set(ting)value during less than 0.1mg/L, valve opening does not change, and this is because too frequent valve regulated can cause dissolved oxygen concentration to vibrate;
2) when relatively large variation takes place in the influent quality of aeration tank and the water yield, the air capacity that each segmentation needs in the aeration tank will change successively according to the order of current process substantially, the monitoring equipment in the segmentation of close water-in will monitor this section dissolved oxygen concentration very soon, the variation tendency of valve opening and aeration rate, according to these variation tendencies, regulated quantity to valve opening is set, when the mean value of dissolved oxygen concentration reduces when regulating preceding 10 minutes aeration rate mean value to increase, the processing load that this section is described increases, the air capacity deficiency of actual needs, the aperture of valve increases fast, thereby make aeration rate increase the downtrending that slows down dissolved oxygen concentration; When the mean value of dissolved oxygen concentration increases when regulating preceding 10 minutes aeration rate mean value to reduce, the processing load that this section is described reduces, the air capacity surplus of actual needs, the aperture of valve reduces fast, thereby aeration rate is reduced, slow down the ascendant trend of dissolved oxygen concentration, specifically, in order to prevent that this inflation method from causing the fluctuation of dissolved oxygen, the each stepping adjustable value of valve is 5% to the maximum, so just can avoid because the periodic swinging of the excessive aeration rate that causes of valve regulated amplitude helps keeping the aeration tank dissolved oxygen steady concentration.
3. according to the described stable intelligent control method of claim 2 to urban sewage plant aeration tank dissolved oxygen, it is characterized in that, described dissolved oxygen concentration in the steady time section, in the aeration tank difference of each sectional dissolved oxygen concentration measured value and set(ting)value should set(ting)value ± 0.1～0.5mg/L in.
4. according to the described stable intelligent control method of claim 2, it is characterized in that urban sewage plant aeration tank dissolved oxygen, described stable intelligent control method to urban sewage plant aeration tank dissolved oxygen, concrete control process is:
1) when the water quality of the water-in (3) of aeration tank (22) is relative with the water yield when stablizing, the air capacity kept stable that each segmentation biochemical reaction needs in the aeration tank (22), the sequence of control that is built on the programmable controller (5) is analyzed by current measured value and 10 minutes mean variation trend to each sectional first to fourth dissolved oxygen meter, respectively first to fourth electrically operated valve is finely tuned, thereby keep the aeration rate of first to fourth gas manifold comparatively stable;
2) when relatively large variation takes place in the water quality of the water-in (3) of aeration tank (22) and the water yield, the air capacity that each segmentation biochemical reaction needs in the aeration tank (22) will change successively according to the order of current process, the first monitoring equipment dissolved oxygen meter (10) in the segmentation of the most close water-in (3) will monitor the variation of dissolved oxygen concentration very soon, in order to make dissolved oxygen keep stable, programmable controller (5) will be carried out step-wise adjustment to the valve opening of first electrically operated valve (14), thereby increase or reduce the aeration rate of first gas manifold (6), and the feedback of utilizing first gas meter (18) to regulate, to slow down the trend that reduces or increase of aeration tank (22) near the dissolved oxygen concentration of water-in (3); In control process, first electrically operated valve (14) was regulated once per 30 seconds, regulating step-length sets by experience according to the correlation parameter of the actual motion of aeration tank (22), after 10 minutes, the measured value of first gas meter (18) of first gas manifold (6) is adjusted to more stable level, after changing with the water quality of the water-in (3) that satisfies aeration tank (22) and the water yield, the actual demand of air feed zone microbial growth on the oxygen amount that first gas manifold (6) is responsible for; Second electrically operated valve (15) in the aeration tank (22), the regulative mode of the 3rd electrically operated valve (16) and the 4th electrically operated valve (17) is basic consistent with the regulative mode of first electrically operated valve (14), the key distinction is on the adjusting of the follow-up electrically operated valve gas manifold that the distance of reference range water-in (3) is closer variation tendency at the mean value of the measured value of preceding 10 minutes gas meter and dissolved oxygen meter, thereby the water quality of the water-in (3) of reflection aeration tank (22) and the variation of the water yield, increase and minimizing situation according to aeration tank (22) current processing load, regulate the electrically operated valve aperture, and utilize the gas meter on each air arm to feed back, thereby realize the aeration as required of each gas manifold, reach first dissolved oxygen meter (10) in the control aeration tank (22), second dissolved oxygen meter (11), the stable effect of measured value of the 3rd dissolved oxygen meter (12) and the 4th dissolved oxygen meter (13).
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| CN1730409A (en) * | 2005-08-12 | 2006-02-08 | 上海昊沧系统控制技术有限责任公司 | On-line control method for aeration quantity in sewage biological treatment technique |
| CN101012088A (en) * | 2007-02-01 | 2007-08-08 | 北京工业大学 | Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique |
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2008
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1583598A (en) * | 2004-06-03 | 2005-02-23 | 同济大学 | Automatic controlling method and controller for treating urban waste water by suspending filler bed |
| CN1730409A (en) * | 2005-08-12 | 2006-02-08 | 上海昊沧系统控制技术有限责任公司 | On-line control method for aeration quantity in sewage biological treatment technique |
| CN101012088A (en) * | 2007-02-01 | 2007-08-08 | 北京工业大学 | Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique |
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