CN108249572A - N in bio-denitrifying sewage technique2The control method and system that O is cut down - Google Patents
N in bio-denitrifying sewage technique2The control method and system that O is cut down Download PDFInfo
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- CN108249572A CN108249572A CN201810285516.3A CN201810285516A CN108249572A CN 108249572 A CN108249572 A CN 108249572A CN 201810285516 A CN201810285516 A CN 201810285516A CN 108249572 A CN108249572 A CN 108249572A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Abstract
N in a kind of bio-denitrifying sewage technique2The control method and system that O is cut down, this method are that SBR methods is utilized to jointly control the hydraulic detention time (HRT) of anaerobic-aerobic section using OPR pH in anaerobic-aerobic activated sludge denitrification treatment process, automatically control the additive amount of exogenous nutrition object；Further, the system for being used to implement the control method is provided.The present invention can reach control greenhouse gases N2On the basis of O discharges, ensure stable water quality treatment, ammonia nitrogen removal frank reduces energy expenditure up to more than 99%.
Description
Technical field
The present invention relates to N in technical field of waste water processing more particularly to a kind of bio-denitrifying sewage technique2The control that O is cut down
Method and system processed.
Background technology
N2O is a kind of strong greenhouse gas, and century-old global warming potential (GWP) is CO2300 times, in air 90% with
On N2O comes from the denitrification process of microorganism, and wherein sewage disposal is considered as N2An important source of release of O.It is estimated that
The N discharged every year in sewage disposal process2O total amounts are about (0.3-3) * 1012kg, account for global N2The 2.5- of O discharge capacity total amounts
25%.Therefore, N effectively during reduction bio-denitrifying sewage2The release of O has for reducing human activity greenhouse gas emission
Important meaning.
The continuous tightening of sewage drainage standard is the universal development trend in current countries in the world；To control eutrophication as mesh
Denitrogenation dephosphorizing become the main objective of the struggle in various countries.Traditional sequencing batch reactor, which uses, continuously to be detested
Oxygen-aerobic process (i.e. denitrification-nitrifying process) is widely used in medium and small sewage farm.But the set time is used in handling
Program is controlled, since influent quality is changeable, causes aeration quantity in most of react superfluous.Simultaneously to ensure denitrifying progress,
The dosage of exogenous nutrition object also tends to surplus.It can increase the aeration of aerobic stage again in the exogenous nutrition object of anaerobic stages surplus
Amount.Now, the sustainable development economy pattern that the whole world is generally emphasized also is embodied in sewage treatment field.Therefore, research is opened
Hair is very urgent to optimize the processing system of energy (money) source consumption.
Invention content
In view of this, it is a primary object of the present invention to provide N in a kind of bio-denitrifying sewage technique2The control that O is cut down
Method and system, to solve at least one of above-mentioned technical problem at least partly.
To achieve the above object, technical scheme is as follows：
As one aspect of the present invention, N in a kind of bio-denitrifying sewage technique is provided2The control method that O is cut down utilizes
SBR methods recycle automatically controlling including being included the following steps：
Step 1：The water inlet of sewage is completed in 5~10min of setting time；
Step 2：Sewage is made to enter simultaneous oxygen/anaerobic stages, monitoring in real time is carried out to the ORP value of sewage to obtain ORP monitorings
Curve if nitrate knee point occur in 10~20min of setting time in the ORP curves, is directly entered next step, instead
It, then add carbon source in batches after 10~20min of setting time, and when there is nitrate knee point on the ORP curves, entrance is next
Step；
Step 3：Sewage is aerated so that sewage enters aerobic stage, monitoring in real time is carried out to the pH value of sewage to obtain
PH monitoring curves are taken, if ammonia valley point occur in 90~120min of setting time in the pH monitoring curves, are directly entered next
Step, conversely, then entering next step after 90~120min of setting time；
Step 4：The water outlet of sewage is completed in 30~40min of setting time.
Preferably, when ORP change with time rate dORP/dt become smaller than setting value α by being more than setting value α when, then sentence
Break and occur nitrate knee point on ORP curves, setting value α is between -5~-5.5；
When pH change with time rate dpH/dt become greater than zero by being less than zero in 90~120min of setting time when, then
Judge occur ammonia valley point on pH curves.
Preferably, in step 2, described the step of adding carbon source in batches, includes：Carbon is added in batches by 15~30s of setting time
Source, and judged after every batch of carbon source adds：If from being added carbon source in 90~100min of setting time, dORP/dt is small
Be less than setting value -300~-330mV in setting value -5~-5.5 or ORP, then into next step, it is on the contrary then when setting
Between enter next step after 90~100min.
Preferably, in step 2, the carbon source is selected from sodium acetate, methanol, glucose or fowl and animal excrement.
Preferably, step 2 is further included after step 2 '：Sewage is made to continue to handle a setting time in simultaneous oxygen/anaerobic stages
15~20min, so that sewage enters anaerobic stages to promote the release of phosphorus.
Preferably, step 3 is further included after step 3 '：Make sewage continue one setting time 15 of aerobic stage processing~
20min, so as to the absorption of biochemical COD in further degrading waste water and promotion phosphorus.
Preferably, in step 4, start to be discharged while sewage enters aerobic stage.
Preferably, the sewage is livestock breeding wastewater, sanitary sewage or landfill leachate.
As another aspect of the present invention, N in a kind of bio-denitrifying sewage technique is provided2The control system that O is cut down, packet
It includes：
Sbr reactor device；
Aerator, for providing aeration into the sbr reactor device；
Carbon source adds pump, for adding carbon source into the sbr reactor device；
Intake pump, for conveying sewage to the sbr reactor device；
Water outlet pump, for exporting sewage from the sbr reactor device；
Sensor, for monitoring the ORP value and pH value in the sbr reactor device in real time；And
PLC control unit, is connected to the aerator, carbon source adds pump, intake pump, water outlet pump and sensor, uses
In the ORP value and pH value that are monitored in real time according to sensor, the aerator, carbon source is controlled to add pump, intake pump and water outlet
Pump, to perform control method as described above.
Preferably, the sbr reactor device is membrane bioreactor；The sensor includes ORP electrodes and pH electrodes.
Based on above-mentioned technical proposal, the beneficial effects of the present invention are：
(1) jointly control the hydraulic detention time in anaerobic-aerobic stage using ORP-pH, automatically control carbon source (i.e. external source
Nutrients) additive amount, ensure the completion of denitrification-nitrifying process, control greenhouse gases N2O is discharged, and ensures stable processing
Water quality, ammonia nitrogen removal frank is up to more than 99%.
(2) in simultaneous oxygen/anaerobic stages process, carbon source is added using pulse mode, while judge whether occur on ORP curves
Nitrate knee point while being conducive to automatically control, effectively avoids the situation of carbon source surplus, reduces the aeration of follow-up aerobic stage
Amount reduces energy expenditure.
(3) setting when carbon source add the time time-out or ORP be less than setting value when, end add carbon source, can to avoid
In actual application, carbon source adds program and enters endless loop.
(4) in aerobic stage using the ammonia valley point on pH detection curves as real-time control point, auto-control aerobic stage
Time span ensures that nitrification is complete, reduces energy expenditure.
Description of the drawings
Fig. 1 is the N that carbon-nitrogen ratio is 4.5 under aerobic condition2O release conditions figures.
Fig. 2 is the N that carbon-nitrogen ratio is 2.6 under aerobic condition2O release conditions figures.
Fig. 3 is the N that carbon-nitrogen ratio is 4.5 under anoxic conditions2O release conditions figures.
Fig. 4 is the N that carbon-nitrogen ratio is 2.6 under anoxic conditions2O release conditions figures.
Fig. 5 is N in one embodiment of the invention bio-denitrifying sewage technique2The control method flow chart that O is cut down.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
The present invention have studied different C/N than the sewage N under aerobic and anoxia condition respectively2The release conditions of O.Such as figure
For 1 and Fig. 2 it is found that under aerobic condition, different C/N ratios lead to N2The rate of release pattern of O is different, but final N2O releases are total
Amount and N2O conversion ratios are substantially very nearly the same：When C/N ratios are 4.5, N2The rate of release of O quickly increases when aerobic stage starts
Add, then gradually reduce, N2O total volumes and N2O conversion ratios are 1.1mgN respectively2O/hr and 1.77%；And it is 2.6 in C/N ratios
When, N2The rate of release of O is integrally in the trend be slowly increased, decline, being slowly increased, N2O total volumes and N2O conversion ratios are distinguished
It is 1.09mgN2O/hr and 1.50%.
Such as Fig. 3 and Fig. 4 it is found that under anoxic conditions, different C/N ratios lead to N2The rate of release pattern of O is different, and
Final N2O total volumes and N2O conversion ratios are also not quite similar：When C/N ratios are 4.5, N2The total volume of O is totally presented one
A trend to grow steadily, and at the end of the denitrification stage, reach a stable burst size, N2O total volumes and N2O turns
It is 0.04mgN respectively to change rate2O/hr and 0.06%；And when C/N ratios are 2.6, after anoxic phases start, N2The burst size of O is anxious
Play rises, and in entire anoxic section all in quick increased state, N2O total volumes and N2O conversion ratios are respectively
10.70mgN2O/hr and 43.39%.
It can be seen from the above, sewage C/N is to N in simultaneous oxygen/Anaerobic Treatment2The burst size of O has significant impact, and C/N compared
It is low, N2The burst size of O increases, and C/N is than excessively high, and aeration quantity during Aerobic Process for Treatment can then increase, and increase energy consumption.Therefore,
How and oxygen/anaerobic processes in by N2The burst size control of O is minimum, and aeration quantity when reducing Aerobic Process for Treatment is to reach
Energy optimization be present invention mainly solves the technical issues of.
Research in Sewage Biological Treatment using pH, ORP as control parameter is to have long time, existing research table
It is bright, in simultaneous oxygen/anaerobic stages of sewage disposal, if occurring nitrate knee point, i.e. inflection point on ORP curves, then show that denitrification is anti-
It should complete；In the aerobic stage of sewage disposal, if occurring ammonia valley point, i.e. minimum point on pH curves, then show that nitration reaction is complete
Into.The present invention uses the addition manner of pulsed exogenous nutrition object in the anaerobic stages of SBR methods, using ORP and pH as automatic
Control technology parameter makes the additive amount of exogenous nutrition object be automatically adjusted to most preferably throw with the variation of influent quality and treatment situation
Dosage reduces N2While O is discharged, the aeration quantity of follow-up aerobic stage is advantageously reduced, reduces energy consumption.Below to this hair
Bright technical solution elaborates.
As shown in figure 5, in one embodiment of this invention, provide N in a kind of bio-denitrifying sewage technique2What O was cut down
Control method is to complete automatic cycle electric control system based on SBR techniques, specifically includes following steps：
(1) water inlet of sewage is completed in setting time T1.
As sewage begins through intake pump and enters in sbr reactor device when cycle starts, and in the present embodiment, uses
Sbr reactor device is membrane bioreactor, is not limited thereto certainly, the present invention can be also realized in the sbr reactor device of other forms
Control method, be provided with stirring motor in the membrane bioreactor, so that sewage is sufficiently mixed, be additionally provided with aerator
To prevent fouling membrane, sewage is entered by intake pump in sbr reactor device II.It is synchronized during water inlet and opens stirring motor, aerator
II and intake pump, setting time T1According to the power setting of selected intake pump into fixed value, usually in below 10min.It completes
Intake pump and stirring motor are closed after water inlet, into simultaneous oxygen/anaerobic stages.
(2) sewage enters simultaneous oxygen/anaerobic stages.
A setting time T is kept after intake pump is closed2Afterwards, sewage enters simultaneous oxygen/anaerobic stages (T2General value for 5~
10min).At this time using " the nitrate knee point " on the continuous monitoring curves of ORP as real-time control point, optimize the supplement of external carbon source
And regulate and control the duration of simultaneous oxygen/anaerobic stages.ORP value can be measured by the OPR electrodes set in sbr reactor device, be monitored in real time
OPR values calculate the time rate of change (dORP/dt) of ORP, and in set T3Judge whether to need into reactor in time
External carbon source is supplemented to enhance the denitrification effect of waste water：If in setting time T3Inside there is dORP/dt and become by being more than setting value α
During to be less than setting value α, then simultaneous oxygen/anaerobism section delay T is directly entered6, it is on the contrary then in setting time T3Carry out what carbon source added afterwards
Step (T3General general value -5~-5.5 of value 15~20min, setting value α).
The step of carbon source adds is adds the pump dirt into sbr reactor device in a pulsed fashion by intermittent unlatching carbon source
Water adds exogenous nutrition object, such as in batches according to setting time T4Exogenous nutrition object is added, which may be selected from second
Sour sodium, methanol, glucose sugar or the degradable carbon source such as fowl and animal excrement, at the same calculate dORP/dt with judge on ORP real-time curves whether
There is inflection point (i.e. " nitrate knee point ").(T4General value is 15~30S) if the batch carbon source adds after, dORP/dt is still
Rule of judgment not up to given herein above can then enter adding for next batch.In addition, in order to prevent actual motion when in carbon source
It adds and endless loop is absorbed in program, the control method in the present embodiment is also designed two Rule of judgment and added with forced termination carbon source
Program：Condition one is that the time t of program is added into carbon source2More than setting value T5；Condition two is less than set-point β for ORP numerical value
(T5General value is 90~100min, and the general values of set-point β are -300~-330mV).As long as meeting any of the above-described condition,
End carbon source can then be controlled to add program and enter simultaneous oxygen/anaerobism section delay T6。
And oxygen/anaerobism section delay T6It is then in order to which sewage after denitrification, is made to enter under anaerobic condition to promote phosphorus
Release.Simultaneous oxygen/anaerobism section delay T can be chosen whether to set according to different experiments purpose6And its time length, it is general
15~20min of value.Enter aerobic stage after simultaneous oxygen/anaerobic stages.
(3) sewage is aerated so that sewage enters aerobic stage.
In the present embodiment, aerator 1 is provided in sbr reactor device, to be aerated to sewage, is aerated by opening
Device I and stirring motor carry out Aerobic Process for Treatment to sewage, at this time using " the ammonia valley point " on pH monitoring curves as real-time control point,
Regulate and control the time span of aerobic stage.The real-time monitoring of pH value is carried out according to the pH electrodes set in sbr reactor device, and is calculated
The time rate of change (dpH/dt) of pH.In the T of setting7In time, whether undergone by the variation of negative value to positive value according to dpH/dt,
To judge whether pH real-time curves minimum point (i.e. " ammonia valley point ") (setting time T occur7Generally 90~120min).If
DpH/dt meets Rule of judgment, then system enters aerobic section delay T8In (T815~20min of general value).Setting aerobic section prolongs
When T8It is in order to after the completion of ammoxidation to carry out aeration, biochemical COD and promotes the absorption of phosphorus in further degrading waste water.
(4) in setting time T9Interior completion sewage water outlet.
The working time of water outlet pump, that is, setting time T9According to the power of selected pump and membrane flux setting (the general values of T9
30~40min).In the present embodiment, enter aerobic stage end unlatching water outlet pump in sewage to be discharged.Therefore, aerobic
Stage terminates after closing aerator I, needs every T10Time judges whether water outlet pump closes (T101~2min of general value),
If water outlet pump is not turned off, need that aerator II is kept to be opened into water outlet pump closing, after water outlet pump closing, close aeration dress
II is put, keeps setting time T11(T afterwards11Can 2~10min of value) terminate epicycle and recycle and enter next round cycle.
In another embodiment of the invention, N in a kind of bio-denitrifying sewage technique is provided2The control system that O is cut down,
Including：Sbr reactor device；Aerator, for providing aeration into sbr reactor device；Carbon source adds pump, for sbr reactor device
In add carbon source；Intake pump, for conveying sewage to sbr reactor device；Water outlet pump, for exporting sewage from sbr reactor device；It passes
Sensor, for monitoring the ORP value and pH value in sbr reactor device in real time；And PLC control unit, it is connected to aerator, carbon source
Pump, intake pump, water outlet pump and sensor are added, for the ORP value and pH value monitored in real time according to sensor, control aeration dress
Put, carbon source adds pump, intake pump and water outlet pump, to perform control method as described above.
Wherein sbr reactor device can be membrane bioreactor, and sensor includes ORP electrodes and pH electrodes.
Some specific embodiments are set forth below, are better illustrated with the implementation to the present invention and technique effect.
Embodiment 1
N in a kind of bio-denitrifying sewage technique2The control method that O is cut down, is applied to the SBR of sewage that C/N ratios are 8
In method treatment process：
In fill phase, setting time T1For 5min；
In simultaneous oxygen/anaerobic stages, setting time T2For 5min, setting time T3For 15min；Setting value α is -5, during setting
Between T4For 30S, setting time T5For 90min, setting value β is -300mV, and the exogenous nutrition object added is sodium acetate, average each
Dosage is 10mL, a concentration of 1mgL-1, setting time T6For 20min；
In aerobic stage, setting time T7For 120min, setting time T8For 15min；
In water outlet stage, setting time T9For 30min, setting time T10For 2min, setting time T11For 5min.
Sewage through one cycle control process 1L finds its ammonia nitrogen removal frank up to 99% by monitoring, and sodium acetate adds
Totalling amount is 12g, N2The total volume of O is within 5.4mg, aeration quantity 3mg/L.
Embodiment 2
N in a kind of bio-denitrifying sewage technique2The control method that O is cut down, it is similar to Example 1, it differs only in：By its
In the SBR method treatment process of sewage for being 10 applied to C/N ratios.
In fill phase, setting time T1For 3min；
In simultaneous oxygen/anaerobic stages, setting time T2For 6min, setting time T3For 20min；Setting value α is -5, during setting
Between T4For 20S, setting time T5For 80min, setting value β is -300mV, and the exogenous nutrition object added is sodium acetate, average each
Dosage is 10mL, a concentration of 1mgL-1, setting time T6For 15min；
In aerobic stage, setting time T7For 100min, setting time T8For 20min；
In water outlet stage, setting time T9For 40min, setting time T10For 1min, setting time T11For 3min.
Sewage through one cycle control process 1.5L finds its ammonia nitrogen removal frank up to 97% by monitoring, sodium acetate
Total amount of adding is 10g, N2The total volume of O is within 6mg, aeration quantity 3.6mg/L.
In conclusion the present invention using ORP and pH as automatic control technology parameter, make the additive amount of exogenous nutrition object with
The variation of influent quality and treatment situation and be automatically adjusted to optimum dosage, reduce N2While O burst sizes, energy damage is reduced
Consumption.
Particular embodiments described above has carried out the purpose of the present invention, technical solution and advantageous effect further in detail
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of N in bio-denitrifying sewage technique2The control method that O is cut down, which is characterized in that included using SBR methods cycle
Automatically controlling including following steps：
Step 1：The water inlet of sewage is completed in 5~10min of setting time；
Step 2：Sewage is made to enter simultaneous oxygen/anaerobic stages, monitoring in real time is carried out to the ORP value of sewage to obtain ORP monitoring curves,
If nitrate knee point occur in 10~20min of setting time in the ORP curves, next step is directly entered, conversely, then existing
Carbon source is added in batches after 10~20min of setting time, when there is nitrate knee point on the ORP curves, into next step；
Step 3：Sewage is aerated so that sewage enters aerobic stage, monitoring in real time is carried out to the pH value of sewage to obtain pH
Monitoring curve if ammonia valley point occur in 90~120min of setting time in the pH monitoring curves, is directly entered next step,
Conversely, then enter next step after 90~120min of setting time；
Step 4：The water outlet of sewage is completed in 30~40min of setting time.
2. control method according to claim 1, it is characterised in that：
When ORP change with time rate dORP/dt become smaller than setting value α by being more than setting value α when, then judge in ORP curves
On there is nitrate knee point, setting value α is between -5~-5.5；
When pH change with time rate dpH/dt become greater than zero by being less than zero in 90~120min of setting time when, then judge
Occurs ammonia valley point on pH curves.
3. control method according to claim 2, which is characterized in that in step 2, described the step of adding carbon source in batches wraps
It includes：By 15~30s of setting time carbon source is added in batches, and judged after every batch of carbon source adds：
If from being added carbon source in 90~100min of setting time, dORP/dt is less than setting value α or ORP and is less than setting
Value β, wherein setting value β are between -300~-330mV, then on the contrary then laggard in 90~100min of setting time into next step
Enter next step.
4. control method according to claim 1, which is characterized in that in step 2, the carbon source be selected from sodium acetate, methanol,
Glucose or fowl and animal excrement.
5. control method according to claim 1, which is characterized in that step 2 is further included after step 2 '：Continue sewage
And oxygen/anaerobic stages handle a 15~20min of setting time, so that sewage enters anaerobic stages to promote the release of phosphorus.
6. control method according to claim 1, which is characterized in that further include step 3 after step 3 '：Continue sewage
A 15~20min of setting time is handled in aerobic stage, so as to the suction of biochemical COD in further degrading waste water and promotion phosphorus
It receives.
7. control method according to claim 1, which is characterized in that in step 4, while sewage enters aerobic stage
Start to be discharged.
8. according to the control method described in claim 1 to 7 any one, which is characterized in that the sewage gives up for livestock and poultry cultivation
Water, sanitary sewage or landfill leachate.
9. a kind of N in bio-denitrifying sewage technique2The control system that O is cut down, including：
Sbr reactor device；
Aerator, for providing aeration into the sbr reactor device；
Carbon source adds pump, for adding carbon source into the sbr reactor device；
Intake pump, for conveying sewage to the sbr reactor device；
Water outlet pump, for exporting sewage from the sbr reactor device；
Sensor, for monitoring the ORP value and pH value in the sbr reactor device in real time；And
PLC control unit for the ORP value and pH value monitored in real time according to sensor, controls the aerator, carbon source to add
Pump, intake pump and water outlet pump, to perform the control method as described in claim 1 to 8 any one.
10. control system according to claim 9, it is characterised in that：
The sbr reactor device is membrane bioreactor；
The sensor includes ORP electrodes and pH electrodes.
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| CN109133353A (en) * | 2018-09-29 | 2019-01-04 | 中国石油天然气集团有限公司 | Short-cut nitrification and denitrification biological denitrificaion control method suitable for oil refining catalyst waste water |
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