CN102557254B - System and method for conducting deep denitrification processing on medium-term landfill leachate - Google Patents
System and method for conducting deep denitrification processing on medium-term landfill leachate Download PDFInfo
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- CN102557254B CN102557254B CN 201110438894 CN201110438894A CN102557254B CN 102557254 B CN102557254 B CN 102557254B CN 201110438894 CN201110438894 CN 201110438894 CN 201110438894 A CN201110438894 A CN 201110438894A CN 102557254 B CN102557254 B CN 102557254B
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Abstract
The invention provides a system and a method for conducting deep denitrification processing on medium-term landfill leachate. A dissolved oxygen (DO) sensor and an oxidation reduction potential (ORP) sensor are respectively connected with a DO tester and an ORP tester, the DO tester, the ORP tester and an aeration mechanism are all connected with a transducer, the ORP tester, the DO tester and the transducer are all connected with a process controller through a computer, and the process controller is respectively connected with a stirring mechanism, a water inlet mechanism, a water outlet mechanism and the aeration mechanism. The steps of applying the processing method of the system are sequentially injecting waste water in a sequencing batch reactor (SBR) and starting the system, enabling the aeration mechanism and the stirring mechanism to conduct nitration, starting the stirring mechanism to conduct denitrification, sediment, dewatering and leaving unused, and enabling the computer to judge the set value of cycle times. The system and the method can solve processing problems of the medium-term landfill leachate, improve use ratio of an organic carbon source in raw water in a processing process, and achieve deep denitrification with low processing cost.
Description
Technical field
The present invention relates to the dirty water living creature processing technique field, especially a kind of to mid-term percolate carry out the system and method that advanced nitrogen is handled.
Background technology
In a single day city domestic refuse percolation liquid enters natural water, can cause the serious destruction that can not repair to the water surrounding of China, and how the processing city domestic refuse percolation liquid of economical and efficient has become the important topic that concerns China's water environment safety.Especially the denitrogenation problem of percolate is terminal point and the difficult point of research both at home and abroad always.Bio-denitrification technology is owing to its reusable edible, and processing costs is low, " marries again " for the uncontamination that removes of real meaning, is widely used in the denitrogenation of percolate at present.In the nitrifying process of biological denitrificaion, the power consumption that is used for the gas blower aeration accounts for more than 60% of total energy consumption, and the aeration phase in present most of percolate biology treatment technology adopts uncontrollable Root's blower or centrifugal blower, omnidistance full power operation in the nitrated process of aeration, energy utilization rate is low, thereby cause the increase of processing cost, gas blower shortening in work-ing life, maintenance of the equipment and maintenance cost are high.
Traditional biologic process for treating sewage after nitrated end, the organic carbon approach exhaustion in the system.In order to realize that denitrification reaches denitrogenation truly, carbon source is finishing denitrification outside must adding in system, otherwise total nitrogen can't reach national up-to-date promulgation " percolate emission standard ".This operator scheme has not only been wasted organic carbon source abundant in the former water, has also caused the increase of processing cost.
Summary of the invention
Weak point at above-mentioned technology, the invention provides a kind of handling problem that can solve the percolate in mid-term, improve the utilization ratio of organic carbon source in treating processes in the former water, and lower processing cost be issued to advanced nitrogen to mid-term percolate carry out the system and method that advanced nitrogen is handled.
For achieving the above object, the invention provides a kind of to mid-term percolate carry out the system that advanced nitrogen is handled, comprise the sbr reactor device, stirring mechanism, water intake mechanism, discharge mechanism, aeration mechanism, DO sensor and ORP sensor, also comprise the DO determinator, the ORP determinator, frequency transformer and process controller, described DO sensor and described ORP sensor are connected with described DO determinator and described ORP determinator respectively, described DO determinator, described ORP determinator all is connected with described frequency transformer with described aeration mechanism, described ORP determinator, described DO determinator is connected with described process controller by computer with described frequency transformer, described process controller respectively with described stirring mechanism, described water intake mechanism, described discharge mechanism is connected with described aeration mechanism.
In described process controller, be provided with into water rly., water outlet rly., aeration rly. and stirrer rly., described water inlet rly. is connected with described water intake mechanism, described water outlet rly. is connected with described water intake mechanism, described aeration rly. is connected with described aeration mechanism, and described stirrer rly. is connected with described stirring mechanism.
Described ORP determinator, described DO determinator and described frequency transformer are connected with the signal input interface of described computer, and the data discharge coupling of described computer is connected with described process controller with described indicating meter respectively.
Described frequency transformer is connected with described aeration mechanism.
Described DO sensor and described ORP sensor all are arranged on the inside of described sbr reactor device.
It is a kind of to the method that mid-term, percolate carried out the advanced nitrogen processing that the present invention also provides simultaneously, may further comprise the steps:
(1) starts the intake pump water inlet, by process controller timing register is set, after system starts, waste water is injected the sbr reactor device;
(2) start aeration mechanism and stirring mechanism and carry out nitratedly, the frequency of gas blower is handled as the real-time control parameter of nitrifying process and through process controller;
(3) after the nitrated end, stop aeration;
(4) start stirring mechanism and carry out denitrification, begin to stir after closing gas blower and intake valve, and gather the ORP signal;
(5) close stirring mechanism, begin precipitation, after reaching predefined sedimentation time, enter next process;
(6) start the flowing water Valve draining, draining enters next process after finishing;
(7) close flowing water Valve, begin to leave unused, after reaching predefined idle mixing time, the cycle index set(ting)value of the entire reaction of system's reading pre-set;
(8) computer is judged the set(ting)value of cycle index, if reach the set(ting)value of the cycle index of predefined entire reaction, it is out of service that then control device makes system automatically, otherwise, then begin to handle from step (1) beginning circulation again.
In step (2), the mode that adopts aeration and agitation cycle to replace is carried out nitration treatment to the sbr reactor device, when starting aeration mechanism, by process controller the cycle alternation of aeration and stirring is set at interval, utilize the DO sensor to gather DO numerical value as the control parameter, judge whether that according to the size of DO numerical value needs regulate the wheel speed frequency of gas blower by process controller and frequency transformer.
When DO numerical value during less than 0.5mg/L, then increase the wheel speed frequency of gas blower, strengthen air quantity; When DO numerical value during greater than 0.5mg/L, then reduce the wheel speed frequency of gas blower, reduce air quantity.
In step (3), with the frequency signal input process controller of gas blower, through filtering process, differentiate is calculated, and obtains the process real time control variables, when the change point of lowering speed quickening appears in the frequency of gas blower, then shows nitrated end.
In step (4), with the real-time control parameter of ORP signal as SBR method denitrification process, when the change point of lowering speed quickening appears in the ORP signal value, show that then denitrification finishes.
Compared with prior art, the present invention has the following advantages:
Treatment system provided by the invention adopts single sbr reactor device, break through traditional control method, water inlet back aeration and stirring alternate run are until nitrated end, last anoxia stirring does not add any organic carbon source, utilizes sludge internal carbon source to carry out denitrification, final reaction finishes draining, its water outlet total nitrogen is lower than 40mg/L, and its clearance reaches more than 95%, reaches the new percolate of promulgating of country about the emission standard of total nitrogen.In this process, be process control parameters by adopting frequency f, when keeping system's low dissolved axygen, control the reaction times of nitrifying process in real time, in time stop aeration.The anoxia stirring stage after aeration finishes, do not add any carbon source, and by the real-time detection to ORP numerical value, judge denitrifying terminal point accurately, stop to stir, save energy consumption.Its sbr reactor device simple in structure, the reaction impellent is big, anti impulsion load, sludge settling is good, and flexible operation is changeable, but characteristics such as periodical operation are specially adapted to the little but special trade effluent of water quality of the water yield such as treating refuse percolate.Compare with other technologies, not only effluent quality is good, and processing costs is low, has good economic benefit.
The method of using above-mentioned treatment system not only can effectively reduce aeration and spend the time of stirring, and can also realize intelligentized control to the variation of the self-adaptation different quality water yield, under the prerequisite that guarantees water quality, farthest saved the energy.
The present invention can be widely used in containing the processing of the suitable trade effluent of high organic object height ammonia nitrogen and carbon-nitrogen ratio, is specially adapted to use the sewage work of SBR technology or the sewage work of preparing to adopt SBR technology.
Description of drawings
Fig. 1 is the structure iron of components of system as directed of the present invention;
Fig. 2 is the schema of the inventive method part;
Fig. 3 is the embodiment schema of Fig. 2;
Fig. 4 is treating refuse percolate parameter Changing Pattern of the present invention and pollutant removal contrast figure.
Main nomenclature is as follows:
1-SBR reactor 2-water inlet pipe 3-intake pump
4-inlet valve 5-rising pipe 6-gas blower
7-solarization air cap 8-stirring rake 9-aeration tube
10-aeration tube air intake valve 11-ORP sensor 12-DO sensor
13-frequency transformer 14-DO determinator 15-ORP determinator
16-computer 17-signal input interface 18-signal output interface
The 19-indicating meter 20-process controller 21-rly. of intaking
22-water outlet rly. 23-aeration rly. 24-stirrer rly.
25-flowing water Valve 26-stirring motor
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
As shown in Figure 1, the invention provides a kind of to mid-term percolate carry out the system that advanced nitrogen is handled, constituted with process controller 20 by sbr reactor device 1, stirring mechanism, water intake mechanism, discharge mechanism, aeration mechanism, computer 16, DO sensor 12, ORP sensor 11, DO determinator 14, ORP determinator 15, frequency transformer 13.Wherein DO determinator 14, ORP determinator 15 and aeration mechanism all are connected with frequency transformer 13, and ORP determinator 15, DO determinator 14 and frequency transformer 13 are connected with process controller 20 by computer 16, and this frequency transformer 13 is connected with aeration mechanism.This process controller 20 is connected with stirring mechanism, water intake mechanism, discharge mechanism and aeration mechanism respectively.DO sensor 12 and ORP sensor 11 all are arranged on the inside of sbr reactor device 1, and DO sensor 12 is connected with DO determinator 14 by lead, and ORP sensor 11 is connected with ORP determinator 15 by lead.ORP determinator 15, DO determinator 14 and frequency transformer 13 are connected with the signal input interface 17 of computer 16, and computer 16 is connected with process controller 20 with indicating meter 19 respectively by the data discharge coupling 18 on its body.In process controller 20, be provided with into water rly. 21, water outlet rly. 22, aeration rly. 23 and stirrer rly. 24, wherein, water inlet rly. 21 is connected with water intake mechanism, water outlet rly. 22 is connected with water intake mechanism, aeration rly. 23 is connected with aeration mechanism, and stirrer rly. 24 is connected with stirring mechanism.The control interface of computer 16 can show at indicating meter 19.
Water intake mechanism is made of with inlet valve 4 water inlet pipe 2, intake pump 3, and an end of water inlet pipe is connected with sbr reactor device 1 injection side, and intake pump 3 is successively set on the pipeline of water inlet pipe 2 with inlet valve, and intake pump 3 is connected with water inlet rly. 21 by lead.Water intake mechanism is made of rising pipe 5 and flowing water Valve 25, and flowing water Valve 25 is arranged on the pipeline of rising pipe 5, and an end of rising pipe 5 is connected with sbr reactor device 1 injection side, and flowing water Valve 25 is connected with water outlet rly. 22 by lead.Aeration mechanism is made of with solarization air cap 7 gas blower 6, aeration tube 9, aeration tube air intake valve 10, one end of aeration tube 9 is connected with gas blower 6, the other end of aeration tube 9 is connected with the solarization air cap 7 that is arranged on sbr reactor device 1 bottom, aeration tube air intake valve 10 is arranged on the pipeline of aeration tube 9, and gas blower 6 is connected with frequency transformer 13 with aeration rly. 23 respectively by lead.Stirring mechanism is made of stirring motor 26 and stirring rake 8, and stirring motor 26 is connected with the top of stirring rake 8, and stirring rake 8 is arranged on the bottom of sbr reactor device 1, and stirring motor 26 is connected with stirrer rly. 24 by lead.
The main device of reaction is the sbr reactor device, and structure of reactor is simple, and the reaction impellent is big, anti impulsion load, sludge settling is good, and flexible operation is changeable, but characteristics such as periodical operation are specially adapted to the little but special trade effluent of water quality of the water yield such as treating refuse percolate.Compare with other technologies, not only effluent quality is good, and processing costs is low, has good economic benefit.
Above-mentioned treatment system adopts single sbr reactor device, break through traditional control method, water inlet back aeration and stirring alternate run are until nitrated end, last anoxia stirring does not add any organic carbon source, utilizes sludge internal carbon source to carry out denitrification, final reaction finishes draining, its water outlet total nitrogen is lower than 40mg/L, and its clearance reaches more than 95%, reaches the new percolate of promulgating of country about the emission standard of total nitrogen.In this process, be process control parameters by adopting frequency f, when keeping system's low dissolved axygen, control the reaction times of nitrifying process in real time, in time stop aeration.The anoxia stirring stage after aeration finishes, do not add any carbon source, and by the real-time detection to ORP numerical value, judge denitrifying terminal point accurately, stop to stir, save energy consumption.Its sbr reactor device simple in structure, the reaction impellent is big, anti impulsion load, sludge settling is good, and flexible operation is changeable, but characteristics such as periodical operation are specially adapted to the little but special trade effluent of water quality of the water yield such as treating refuse percolate.Compare with other technologies, not only effluent quality is good, and processing costs is low, has good economic benefit.
As shown in Figure 2, it is a kind of to the method that mid-term, percolate carried out the advanced nitrogen processing that the present invention also provides simultaneously, may further comprise the steps:
(1) starts the intake pump water inlet, by process controller timing register is set, after system starts, waste water is injected the sbr reactor device, after reaching the predefined time, close intake pump and inlet valve.
In step (1), determine flooding time according to flooding quantity, and by process controller timing register is set, after system starts, start intake pump pending waste water is injected the sbr reactor device, after reaching the predefined time, close intake pump and inlet valve, enter next process.
(2) start aeration mechanism and stirring mechanism and carry out nitratedly, the frequency of gas blower is handled as the real-time control parameter of nitrifying process and through process controller.
In step (2), at first by process controller aeration is set at interval, as being half an hour spacing frequency.At aeration phase, open air intake valve, start gas blower, the sbr reactor device is carried out aeration.In addition, utilize the DO sensor to gather the DO signal simultaneously, as the control parameter, judge whether that according to the size of DO numerical value needs regulate the wheel speed frequency of gas blower by process controller and frequency transformer with DO numerical value.When DO numerical value during less than 0.5mg/L, then increase the wheel speed frequency of gas blower, strengthen air quantity; When DO numerical value during greater than 0.5mg/L, then reduce the wheel speed frequency of gas blower, reduce air quantity.The sbr reactor device automatically switches to agitation phases after carrying out halfhour aeration.At this moment, system closing aeration air intake valve and gas blower are opened agitator, stir.After agitator stirred half an hour, system can automatically switch to aeration phase, constantly cycle alternation.
In step (2), with the frequency signal of the gas blower real-time control parameter as SBR method aerobic nitrification process.With the frequency signal input process controller of gas blower, through filtering process, differentiate is calculated, and obtains the process real time control variables, when the change point of lowering speed quickening appears in the frequency of gas blower, then shows nitrated end.This moment, topworks closed gas blower and intake valve, stopped aeration, entered next process then.
(3) after the nitrated end, stop aeration.
(4) start stirring mechanism and carry out denitrification, begin to stir after closing gas blower and intake valve, and gather the ORP signal.
In step (4), close gas blower and aeration intake valve after, begin to stir, at the same time, open the ORP sensor and gather the ORP signal.With the real-time control parameter of ORP as SBR method denitrification process, when the change point of lowering speed quickening appears in the ORP signal value, show that then denitrification finishes.This moment, topworks closed stirring, yet entered next process.
(5) close stirring mechanism, the time of setting precipitation begins precipitation, and carries out timing by process controller, after reaching predefined sedimentation time, enters next process.
(6) start the flowing water Valve draining, at first set the time of draining, open flowing water Valve, will handle back water outside rising pipe is discharged to the sbr reactor device; Draining is closed the valve on the rising pipe after finishing, and enters next process.
(7) close flowing water Valve, begin to leave unused, under process controller is regulated, after reaching predefined idle mixing time, the cycle index set(ting)value of the entire reaction of system's reading pre-set.
(8) computer is judged the set(ting)value of cycle index, if reach the set(ting)value of the cycle index of predefined entire reaction, it is out of service that then control device makes system automatically, otherwise, then begin to handle from step (1) beginning circulation again.
The working method that adopts among the present invention is compared with traditional operating method, can obtain higher nitric efficiency, major cause has: 1, in the nitrated stage, adopt the operational mode that intermittently stirs intermittent aeration, keep lower dissolved oxygen levels at aeration phase simultaneously.Under this operational mode, system can reach higher synchronous nitration denitrification effect (about 40%).2, after the nitrated end, be not sedimentation and drawing immediately, but continue to stir.Because in the operating method that the nitrated stage adopts intermittent aeration intermittently to stir, oxygen is less relatively to the restraining effect of denitrifying bacteria, therefore, continue to stir in nitrated end back.When system transition became anoxic condition, the activity of denitrifying bacteria was activated.In this stage, denitrifying bacteria can utilize the carbon source that himself stores to carry out denitrification.Therefore, system's denitrification completely under the situation of not adding any organic carbon source, the final outflow water total nitrogen is lower than 40mg/L, has greatly reduced processing costs.Simultaneously, the restraining effect of percolate toxicity and this operating method combined action can reduce the growth of mud to greatest extent under the prerequisite that guarantees effluent quality.Under stable case, sludge quantity will be kept running balance, therefore can further reduce the expense of sludge disposal, reduce processing cost.
The present invention combines variable frequency control and control in real time, can farthest cut down the consumption of energy.At first, at aeration phase, by the frequency of control gas blower, in conjunction with frequency transformer, system dissolves oxygen in the nitrifying process is maintained constant level, this control method is compared with the control method of constant aerating amount, can reduce the gas blower aeration energy consumption effectively, save about 40% energy consumption.Secondly, by real-time control strategy, as the parameter of controlling in real time, can judge the time of the nitrated end of system and denitrification end with the frequency of control gas blower and ORP value accurately.This control method not only can effectively reduce aeration and spend the time of stirring, and can also realize intelligentized control to the variation of the self-adaptation different quality water yield, under the prerequisite that guarantees water quality, farthest saved the energy.
As shown in Figure 3, serve as to handle object (pH=7.5～8.0, COD=3900～4000mg/L, NH with the actual percolate of Beijing refuse landfill
4 +-N=800～900mg/L, NO
x≤ 10mg/L).When the phase begins weekly, mixed solution ammonia nitrogen concentration 150～160mg/L in the reactor, COD concentration is 850～900mg/L, NO
xConcentration≤5mg/L, sludge concentration=6.5g/L～7g/L, temperature=25 ℃, its detailed process is as follows:
(1) at first open inlet valve, start intake pump pending percolate is injected the sbr reactor device, setting flooding time by process controller is 10 minutes, and 10 minutes laggard intake pump and inlet valves of closing enter next process;
(2) starting aeration mechanism and stirring mechanism and carry out nitratedly, at first by process controller aeration is set at interval, is spacing frequency with the half an hour.At aeration phase, open air intake valve, start gas blower, the sbr reactor device is carried out aeration.In addition, utilize the DO sensor to gather the DO signal simultaneously, as the control parameter, judge whether that according to the size of DO numerical value needs regulate the wheel speed frequency of gas blower by process controller and frequency transformer with DO numerical value.When DO numerical value during less than 0.5mg/L, then increase the wheel speed frequency of gas blower, strengthen air quantity; When DO numerical value during greater than 0.5mg/L, then reduce the wheel speed frequency of gas blower, reduce air quantity.The sbr reactor device automatically switches to agitation phases after carrying out halfhour aeration.At this moment, system closing aeration air intake valve and gas blower are opened agitator, stir.After agitator stirred half an hour, system can automatically switch to aeration phase, constantly cycle alternation;
(3) after the nitrated end, with the frequency signal of the gas blower real-time control parameter as SBR method aerobic nitrification process.With the frequency signal input process controller of gas blower, through filtering process, differentiate is calculated, and obtains the process real time control variables, when the change point of lowering speed quickening appears in the frequency of gas blower, then shows nitrated end.This moment, topworks closed gas blower and intake valve, stopped aeration, entered next process then;
(4) start stirring mechanism and carry out denitrification, close gas blower and aeration intake valve after, begin to stir, at the same time, open the ORP sensor and gather the ORP signal.With the real-time control parameter of ORP numerical value as SBR method denitrification process, when the change point of lowering speed quickening appears in the ORP signal value, show that then denitrification finishes.This moment, topworks closed stirring, yet entered next process;
(5) close stirring mechanism, setting sedimentation time by process controller is 30 minutes, and gas blower, agitator, inlet valve, air intake valve, water discharging valve and spoil disposal valve are all closed at this moment.After reaching predefined sedimentation time, enter next process;
(6) start the flowing water Valve draining, at first set the time of draining, open flowing water Valve, will handle back water outside rising pipe is discharged to the sbr reactor device; Draining is closed the valve on the rising pipe after finishing, and enters next process;
(7) close flowing water Valve, begin to leave unused, under process controller is regulated, be set at 2 hours working time idle mixing time, after reaching predefined idle mixing time, the cycle index set(ting)value of the entire reaction of system's reading pre-set;
(8) computer is judged the set(ting)value of cycle index, if reach the set(ting)value of the cycle index of predefined entire reaction, it is out of service that then control device makes system automatically, otherwise, then begin to handle from step (1) beginning circulation again.
Utilize provided by the present invention to mid-term percolate carry out the system and method that advanced nitrogen handles and handle the percolate in mid-term, under the condition of not adding any organic carbon source, final outflow water ammonia nitrogen≤5mg/L, NO
2≤ 5mg/L, NO
3≤ 5mg/L, TN≤40mg/L has reached in the relevant percolate emission standard of national new promulgation the standard about ammonia nitrogen and total nitrogen.In addition, compare with the control mode of constant aerating amount, this control method and control device have been saved about 40% power consumption.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
- One kind to mid-term percolate carry out the method that advanced nitrogen is handled, this method to mid-term percolate carry out finishing in the advanced nitrogen treatment system, this system comprises the sbr reactor device, stirring mechanism, water intake mechanism, discharge mechanism, aeration mechanism, DO sensor and ORP sensor, the DO determinator, the ORP determinator, frequency transformer and process controller, described DO sensor and described ORP sensor are connected with described DO determinator and described ORP determinator respectively, described DO determinator, described ORP determinator all is connected with described frequency transformer with described aeration mechanism, described ORP determinator, described DO determinator is connected with described process controller by computer with described frequency transformer, described process controller respectively with described stirring mechanism, described water intake mechanism, described discharge mechanism is connected with described aeration mechanism; Above-mentioned to mid-term percolate carry out the method that advanced nitrogen handles and may further comprise the steps:(1) starts the intake pump water inlet, by process controller timing register is set, after system starts, waste water is injected the sbr reactor device;(2) start aeration mechanism and stirring mechanism and carry out nitratedly, the frequency of gas blower is handled as the real-time control parameter of nitrifying process and through process controller;(3) after the nitrated end, stop aeration;(4) start stirring mechanism and carry out denitrification, begin to stir after closing gas blower and intake valve, and gather the ORP signal;(5) close stirring mechanism, begin precipitation, after reaching predefined sedimentation time, enter next process;(6) start the flowing water Valve draining, draining enters next process after finishing;(7) close flowing water Valve, begin to leave unused, after reaching predefined idle mixing time, the cycle index set(ting)value of the entire reaction of system's reading pre-set;(8) computer is judged the set(ting)value of cycle index, if reach the set(ting)value of the cycle index of predefined entire reaction, it is out of service that then control device makes system automatically, otherwise, then begin to handle from step (1) beginning circulation again.
- According to claim 1 to mid-term percolate carry out the method that advanced nitrogen is handled, it is characterized in that, in step (2), the mode that adopts aeration and agitation cycle to replace is carried out nitration treatment to the sbr reactor device, when starting aeration mechanism, by process controller the cycle alternation of aeration and stirring is set at interval, utilize the DO sensor to gather DO numerical value as the control parameter, judge whether that according to the size of DO numerical value needs regulate the wheel speed frequency of gas blower by process controller and frequency transformer.
- According to claim 2 to mid-term percolate carry out the method that advanced nitrogen is handled, it is characterized in that, when DO numerical value during less than 0.5mg/L, then increase the wheel speed frequency of gas blower, strengthen air quantity; When DO numerical value during greater than 0.5mg/L, then reduce the wheel speed frequency of gas blower, reduce air quantity.
- According to claim 1 to mid-term percolate carry out the method that advanced nitrogen is handled, it is characterized in that, in step (3), frequency signal input process controller with gas blower, through filtering process, differentiate is calculated, and obtains the process real time control variables, when the change point of lowering speed quickening appears in the frequency of gas blower, then show nitrated end.
- According to claim 1 to mid-term percolate carry out the method that advanced nitrogen is handled, it is characterized in that, in step (4), with the real-time control parameter of ORP signal as SBR method denitrification process, when the change point of lowering speed quickening appears in the ORP signal value, show that then denitrification finishes.
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