CN108147536A - The prevention and control method of biological denitrification process excess aeration - Google Patents
The prevention and control method of biological denitrification process excess aeration Download PDFInfo
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- CN108147536A CN108147536A CN201711471422.7A CN201711471422A CN108147536A CN 108147536 A CN108147536 A CN 108147536A CN 201711471422 A CN201711471422 A CN 201711471422A CN 108147536 A CN108147536 A CN 108147536A
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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
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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
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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
- C02F2209/14—NH3-N
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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
- C02F2209/42—Liquid level
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Abstract
A kind of prevention and control method of biological denitrification process excess aeration, by monitoring ORP, pH, ammonia nitrogen and the variation of level value in real time, the start and stop that pump and aeration pump are added into and out of water pump and soda acid of integral part nitrosation anaerobic ammonia oxidation reactor are controlled, so as to improve the treatment efficiency and operation stability of integral part nitrosation anaerobic ammonia oxidation reactor.The prevention and control method of biological denitrification process excess aeration of the present invention while wastewater treatment, can reduce the discharge of greenhouse gases, without additional carbon, and save the energy due to aeration quantity is low, save operating cost.
Description
Technical field
The invention belongs to wastewater biological denitrificaion technical fields, and in particular to a kind of prevention of biological denitrification process excess aeration
Control method.
Background technology
Nearly annual 2450000 tons of the ammonia nitrogen discharge capacity of five annuals of China, total amount is big, and pollution weight, fall is small year by year, remote super
Bearing capacity of ecological environment.In numerous industrial trades, metallurgy industry, semicon industry, fertilizer industry, petrochemical industry and agricultural and sideline food
The waste water such as product processing industry are respectively provided with higher ammonia nitrogen discharge capacity, and nitrate pollution causes river, lake eutrophication phenomenon serious.
In face of increasingly serious pollution situation, the contaminants associated discharge standard in China is also increasingly stringent, and urban wastewater treatment firm shows at present
There are the level-one A standard specified values in maximum emission standard to be：Ammonia nitrogen 5mg/L, total nitrogen 15mg/L；And it is closed in industrial wastewater discharge standard
Different due to though the limit value of ammonia nitrogen and total nitrogen is because industry, majority requires respectively lower than 15mg/L and 35mg/L.
It is molten that integral part nitrosation-anaerobic ammoxidation reactor should avoid the variation of aeration quantity from causing in the process of running
Solution oxygen fluctuates and the functional flora stable structure in destruction system even influences its activity.When in system dissolved oxygen content rise,
More mineralized nitrogens are nitrite nitrogen by ammonia oxidation bacteria, and nitrite oxidizing bacteria then has more matrix to carry out nitrogen transformation,
Consequence has：(1) the nitrate raising that system generates；(2) nitration reaction into consumption system basicity is about to, lead to basicity not
Foot, pH are reduced, if lasting carry out without being regulated and controled, system dissolved oxygen can be caused to increase sharply, control disorder；(3) nitrous acid
Salt oxidation bacteria makes active raising when having two necessary conditions of matrix and oxygen, and anaerobic ammonia oxidizing bacteria is because of the suppression of dissolved oxygen
It makes and activity reduction, is in a disadvantageous position in nitrite oxidizing bacteria to the competition of nitrite nitrogen, so as to influence the anaerobism of system
Ammoxidation process.In existing research, the control to the problem uses more and dissolved oxygen is installed in robot control system(RCS) in line electrode, if
Its high and low limit value is put to control.But due to the limitation of the Anammox in Intergration system, dissolved oxygen supply can only be taken
The form of limited aeration, and under anoxic conditions carry out Anammox reaction when, dissolved oxygen electrode be difficult delicately play refer to
Show the effect of reaction system redox state.
Invention content
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of preventions of biological denitrification process excess aeration
Control method, at least one of to solve the above problems.
The present invention is achieved through the following technical solutions：
The present invention provides a kind of prevention and control method of biological denitrification process excess aeration, includes the following steps：
Pending waste water is imported by intake pump in reactor and is stirred；The reactor control unit circulating
Capable main control logic performs following steps：
Judge that whether liquid level meets or exceeds setting liquid level upper limit value in the reactor, if it is closes intake pump；
If otherwise intake pump is maintained to remain in operation；
It closes intake pump after a certain period of time, starts aeration pump, judge whether the ammonia nitrogen concentration in reactor is equal to or less than
Low value is set, if it is stops aeration pump；If otherwise continue to be aerated；
Continue to stir certain time after stopping aeration, stop quiet heavy certain time after stirring, be then turned on water outlet motor-driven valve, treat
Liquid level closes water outlet motor-driven valve after reaching setting low value；
It is idle to open the second wheel cycle after a certain period of time, above-mentioned main control logic is repeated, it is to be recycled to reach setting time
It counts, then end loop.
Preferably, the reactor control unit is additionally provided with following ORP protections control logic：
If ORP is greater than or equal to setting high level in aeration process, stop being aerated；
Then continue to be aerated, while judge whether ammonia nitrogen concentration reaches setting low value if less than setting low value, if it is
Stop being aerated and perform follow-up stirring, quiet heavy, draining；If otherwise continue to be aerated.
Preferably, the reactor control unit is additionally provided with following soda acid regulation and control logic：
When pH value is less than setting low value in the reactor, starts alkali and add pump, set after a certain period of time if pH value is more than
Definite value then closes alkali and adds pump, if otherwise continuing on alkali adds pump；
When pH value is higher than setting high level in the reactor, starts acid and add pump, set after a certain period of time if pH value is less than
Definite value then closes acid and adds pump, if otherwise continuing on acid adds pump.
Preferably, the reactor is integral type partial nitrification-anaerobic ammonia oxidation reactor.
It can be seen from the above technical proposal that the prevention and control method of the biological denitrification process excess aeration of the present invention has
Following advantageous effect：
(1) a kind of control method of the sequence bioreactor processing high ammonia-nitrogen wastewater of stability and high efficiency is provided, it can be with
While waste water is handled, the discharge of greenhouse gases is reduced, without additional carbon, the energy is saved due to aeration quantity is low, saves fortune
Row cost；
(2) by the control method when influent ammonia nitrogen reaches 800mg/L, water outlet ammonia nitrogen concentration is made to reach 30mg/L even
Lower, ammonia nitrogen removal frank is more than 95%；
(3) operation of method control reactor regulated and controled online using ORP, can effectively avoid and destroy bacterium due to aeration is excessive
Group structure maintains reactor operational effect；
(4) pH of reaction system and basicity can be maintained optimum range by the online regulation and control of acid and alkali pumps, be avoided with portion
Divide the progress of nitrosation and consume basicity, system DO values is caused to be increased sharply due to basicity deficiency, influence the normal execution of control logic.
Description of the drawings
Fig. 1 is the ORP-NH4 of biological denitrification process in the embodiment of the present invention+- N- liquid levels combine the control of real-time monitoring method
Logic chart processed；
Fig. 2 is biological denitrification process schematic device in the embodiment of the present invention；
【Figure elements explanation】
1- inlet buckets；2- integral part nitrosation-anaerobic ammoxidation reactors；
3- computers；4-PLC control units；
5-pH、DO、NH4 +- N, ORP, fluid level controller.
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 invention discloses a kind of prevention and control method of biological denitrification process excess aeration, by monitor in real time ORP,
The variation of pH, ammonia nitrogen and level value, control integral part nitrosation-anaerobic ammoxidation reactor into and out of water pump and soda acid
Add the start and stop of pump and aeration pump, so as to improve the treatment efficiency of integral part nitrosation-anaerobic ammoxidation reactor and
System run all right.The present invention can reduce the discharge of greenhouse gases while waste water is handled, without additional carbon, because
Aeration quantity is low and saves the energy, saves operating cost.
Specifically, regulation and control method of the invention, based on integral part nitrosation-anaerobic ammoxidation reactor, with
The technology of ORP, pH, ammonia nitrogen and liquid level joint real-time monitoring for core.Fig. 2 is biological denitrification process device in the embodiment of the present invention
Schematic diagram.As shown in Fig. 2, biological denitrification process device includes：Inlet bucket 1, the reaction of integral part nitrosation-anaerobic ammoxidation
Device 2, computer 3, PLC control unit 4 and pH, DO, NH4 +- N, ORP, fluid level controller 5.
The variation of ORP, pH, ammonia nitrogen and level value, control one are monitored in real time by the program and on-line sensor of setting
The start and stop that pump and aeration pump are added into and out of water pump and soda acid of formula partial nitrification-anaerobic ammonia oxidation reactor, so as in real time
Regulate and control the stable operation of integral part nitrosation-anaerobic ammoxidation reactor reaction device.
Fig. 1 is the ORP-NH of the biological denitrification process in one embodiment of the invention4 +- N- liquid levels joint real-time monitoring method
Control logic figure.As shown in Figure 1, the control logic is total to three parts including main control logic, relay protective scheme and acid-base accommodation logic.
First, main control logic：
After cycle starts, start agitating paddle first, be then turned on intake pump；Judge in reactor whether liquid level reaches again to set
Determine the upper limit, intake pump shuts down if reaching the upper limit, and intake pump is continued to run with if the not up to setting upper limit；
It treats to finish into water, continues stirring a period of time so that the dissolved oxygen that water inlet generates all is consumed；It is then turned on aeration pump,
If ammonia nitrogen electrode reading is equal to or less than setting low value, stop aeration pump；If ammonia nitrogen electrode reading is more than setting low value, after
It is continuous to open aeration pump；
After aeration pump is closed due to ammonia nitrogen reading reaches setting low value, continue to stir certain time so that gas is from muddy water
It is removed in mixed liquor, improves sludge settling effect；
After agitating paddle is out of service, reactor into the heavy stage in meditation, mud-water separation for a period of time after, you can open water outlet
Motor-driven valve carries out draining；
When liquid level reaches setting low value in drainage procedure, then water outlet motor-driven valve is closed；It is idle to enter after a certain period of time
The control loop of a new round.
2nd, relay protective scheme：
In the continuous aeration stage, if ORP electrodes reading is greater than or equal to setting high level, stop aeration pump；
When ORP electrodes reading is less than or equal to setting value, then continues to start aeration pump, while judge ammonia nitrogen electrode reading,
If its value stops aeration pump less than or equal to setting low value；If its value is more than setting low value, should continue to be aerated.
3rd, soda acid regulates and controls：
When pH value is less than setting low value in the reactor, starts alkali and add pump, if pH value is more than after certain time
Setting value then closes alkali and adds pump, if otherwise continuing on alkali adds pump；
When pH value is higher than setting high level in the reactor, starts acid and add pump, if pH value is less than after certain time
Setting value then closes acid and adds pump, if otherwise continuing on acid adds pump.
The high ammonia-nitrogen wastewater that 1 integral part nitrosation-anaerobic ammoxidation reactor for treatment of embodiment is manually prepared
With integral part nitrosation-anaerobic ammoxidation reactor for treatment artificial wastewater, using ORP-NH4 +- N-pH- liquid levels
Combined method for regulating.Influent ammonium concentration used be 800mg/L, aeration flow be 300mL/min, integral part nitrosation-
Anaerobic ammonia oxidation reactor is exchanged than being 1/3, and system dischargeable capacity is 60L, makes its temperature stabilization 33 ± 1 using heating water bath
DEG C, hydraulic detention time depends on function bacterium activity and ammonia nitrogen draining threshold value in system, when controlling its sludge retention by spoil disposal
Between be 40 days.Table 1 is formulated for artificial wastewater, and table 2 is trace element formula.
1 artificial wastewater of table is formulated
2 trace element solution formula of table
The reactor in addition to equipped with intake pump, water outlet pump and aeration pump, be also equipped with acid adds pump, alkali adds pump, DO sensing
Device, pH sensors, ORP sensors, liquid level sensor, PLC control cabinet.
When reactor brings into operation, start blender, intake pump, stop intake pump when liquid level reaches the upper limit, continue
A period of time is stirred to consume the oxygen that water inlet is brought into the process.Restart aeration pump, when ammonia nitrogen is less than retention concentration in system
When (setting low value), aeration pump is closed, continues stirring, quiet heavy and drain step.If ammonia nitrogen not up to retains concentration, and
ORP should then stop being aerated, continue stirring a period of time to consume excessive oxygen, and check reaction in time higher than setting limit value
Whether device aerating system goes wrong；Treat ORP readings less than setting low value and ammonia nitrogen concentration be not up to Effluent criteria, then continue into
Row aeration.In reactor operational process, especially when ORP is higher than setting limit value, robot control system(RCS) opens alkali according to pH readings
Liquid addition pump, regulates and controls it.After startup alkali adds pump operation for a period of time, if pH reaches setting value, stop alkali throwing
Add pump.
When with this integral part nitrosation-anaerobic ammoxidation reactor for treatment artificial wastewater, control using the present invention
Logic processed, water-in and water-out ammonia nitrogen concentration are respectively 800mg/L, 30mg/L, and ammonia nitrogen average removal rate is more than 95%.
To sum up, the prevention and control method of biological denitrification process excess aeration of the present invention can be in the same of processing waste water
When, the discharge of greenhouse gases is reduced, without additional carbon, the energy is saved due to aeration quantity is low, saves operating cost.
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 (4)
- A kind of 1. prevention and control method of biological denitrification process excess aeration, which is characterized in that include the following steps：Pending waste water is imported by intake pump in reactor and is stirred；The reactor control unit circular flow Main control logic performs following steps：Judge that whether liquid level meets or exceeds setting liquid level upper limit value in the reactor, if it is closes intake pump；If Otherwise intake pump is maintained to remain in operation；It closes intake pump after a certain period of time, starts aeration pump, judge whether the ammonia nitrogen concentration in reactor is equal to or less than setting Low value if it is stops aeration pump；If otherwise continue to be aerated；Continue to stir certain time after stopping aeration, stop quiet heavy certain time after stirring, be then turned on water outlet motor-driven valve, treat liquid level Water outlet motor-driven valve is closed after reaching setting low value；It is idle to open the second wheel cycle after a certain period of time, above-mentioned main control logic is repeated, it is to be recycled to reach setting number, then End loop.
- 2. prevention and control method according to claim 1, which is characterized in that the reactor control unit be additionally provided with as Lower ORP protects control logic：If ORP is greater than or equal to setting high level in aeration process, stop being aerated；Continue to be aerated, while judge whether ammonia nitrogen concentration reaches setting low value if ORP is less than setting low value, if it is stop It is only aerated and performs follow-up stirring, quiet heavy, draining；If otherwise continue to be aerated.
- 3. prevention and control method according to claim 1, which is characterized in that the reactor control unit be additionally provided with as Lower soda acid regulates and controls logic：When pH value is less than setting low value in the reactor, starts alkali and add pump, after a certain period of time if pH value is more than setting value It then closes alkali and adds pump, if otherwise continuing on alkali adds pump；When pH value is higher than setting high level in the reactor, starts acid and add pump, after a certain period of time if pH value is less than setting value It then closes acid and adds pump, if otherwise continuing on acid adds pump.
- 4. prevention and control method according to claim 1, wherein the reactor is integral type partial nitrification-anaerobism ammonia Oxidation reactor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109502754A (en) * | 2018-12-11 | 2019-03-22 | 苏州科技大学 | Optimization progress control method and device for two-stage type autotrophic denitrification technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109502754A (en) * | 2018-12-11 | 2019-03-22 | 苏州科技大学 | Optimization progress control method and device for two-stage type autotrophic denitrification technique |
| CN109502754B (en) * | 2018-12-11 | 2023-11-21 | 苏州科技大学 | Optimized operation control method and device for two-stage autotrophic denitrification process |
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