CN108840436A - A kind of short-cut nitrification-denitrification reaction unit and production technology - Google Patents
A kind of short-cut nitrification-denitrification reaction unit and production technology Download PDFInfo
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- CN108840436A CN108840436A CN201810998067.7A CN201810998067A CN108840436A CN 108840436 A CN108840436 A CN 108840436A CN 201810998067 A CN201810998067 A CN 201810998067A CN 108840436 A CN108840436 A CN 108840436A
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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
Abstract
The invention discloses a kind of short-cut nitrification-denitrification reaction units, reaction kettle including being provided with blender, the water inlet pipe being connected with intake pump is communicated on reaction kettle, the drainpipe that the carbon source liquid that pump is connected adds pipe and is connected with draining pump is added with carbon source, reactor bottom is provided with the microporous aeration disc being connected with aerator, the temp probe that head is located at autoclave body liquid level or less 6-7cm is bolted on the top cover of reaction kettle, pH probe, DO probe and ORP probe, the signal output end respectively popped one's head in is electrically connected with the signal input part of PLC respectively, the control output end of PLC is respectively and intake pump, carbon source adds pump, draining pump, aerator, blender, the control signal of liquid crystal display is electrically connected；The invention also discloses a kind of production technologies for reacting DO and ORP first derivative as the short-cut nitrification-denitrification of control parameter, can guarantee higher ammonia nitrogen removal frank, effectively reduce aeration and reaction time, save the energy consumption of operational process.
Description
Technical field
The present invention relates to the reaction units that biological treatment is carried out to low-concentration ammonia-nitrogen sanitary sewage, more particularly, to a kind of short
Journey nitrification-denitrification reaction device and production technology.
Background technique
To the lower sanitary sewage of ammonia-nitrogen content, when sewage plant mostly uses traditional nitrification-denitrification technique to be handled.
In order to guarantee quality of sewage disposal, aerobic nitrification process needs a large amount of aerations, and the real reaction time is greater than the real institute of reaction
It is excessively high not only result in energy consumption, and is easy to cause NOB the time needed（Nitrite-oxidizing bacterium）Undue growth, and and AOB
（Ammonia oxidation bacteria）Dissolved oxygen is competed, original biological community structure in reactor is destroyed, nitric efficiency is caused to reduce.Therefore,
There is researcher to propose short-cut nitrification-denitrification technique, that is, control the degree of nitration reaction, after mineralized nitrogen is nitrite nitrogen
The progress for stopping the aerobic aeration stage immediately, makes nitrite nitrogen directly be reduced to nitrogen in anoxic phases, thus reduces aerobic
Conversion and conversion from anoxic phases nitrate nitrogen to nitrite nitrogen of the stage nitrite nitrogen to nitrate nitrogen, thus effectively reduce aeration and
Reaction time saves the energy consumption of device operation.However, the key point of short-cut nitrification-denitrification technique --- how to control
The terminal of nitration reaction, the undue growth for controlling NOB, are still one of the research hotspot in the field so far.
Summary of the invention
The present invention provides a kind of short-cut nitrification-denitrification reaction unit, while providing a kind of short-cut nitrification-denitrification reaction
Production technology, it is therefore intended that solve the problems, such as that existing short-cut nitrification-denitrification technique cannot accurately control nitration reaction terminal.
To achieve the above object, the present invention can take following technical proposals：
Short-cut nitrification-denitrification reaction unit of the present invention, the reaction kettle including being provided with blender, on the reaction kettle
It is communicated with the water inlet pipe being connected with intake pump, adds the row that the carbon source liquid that pump is connected adds pipe and is connected with draining pump with carbon source
Water pipe, reactor bottom are provided with the microporous aeration disc being connected with aerator, are bolted with head on the top cover of reaction kettle and are located at
The temp probe of 6-7cm below autoclave body liquid level, pH probe, DO probe and ORP probe, the temp probe, pH probe, DO probe
With ORP probe signal output end respectively with the signal input part of PLC be electrically connected, the control output end of the PLC respectively and into
Water pump, carbon source add the control signal electrical connection of pump, draining pump, aerator, blender, liquid crystal display.
The diameter of the microporous aeration disc is the 1/3-1/2 of reaction kettle diameter.
The blender is connected with electrodeless variable-speed governor.
Using the production technology of above-mentioned short-cut nitrification-denitrification reaction unit, include the following steps：
The first step opens aerator and blender, and air is continually fed into reaction kettle, carries out pre-exposure solid/liquid/gas reactions, removes in kettle
Remaining organic carbon source in sludge；After first peak value occurs in the first derivative of DO, intake pump is opened, sewage is made to enter reaction
Kettle carries out nitration reaction while stirring；After second peak value occurs in the first derivative of DO, continues stirring and added for 20 minutes
Aeration reaction is then shut off aerator；
Second step continues working blender, opens carbon source and adds pump addition proper amount of carbon source liquid progress anoxic denitrification reaction,
20 minutes after peak value occurs in the first derivative of ORP, blender is closed, stands after ten minutes, opens draining pump, drain, terminate
Reaction.
The aeration speed of the air is 2-6L/min, and sludge quantity containing bacterium is the 60-80% of reactor volume, wastewater influent
Amount is the 10-15% of reactor volume, and carbon source Liquid addition is the 0.3-0.5% of reactor volume.
The carbon source liquid is any one of sodium acetate, methanol, ethyl alcohol.
The present invention is anisotropic using the time difference that AOB and NOB carries out biological metabolism, by monitoring DO（Dissolved oxygen）And ORP（Oxygen
Change reduction potential）First derivative variation, make ammonia nitrogen after being converted into nitrite nitrogen, in time stop aeration, prevent nitrous state
Nitrogen is oxidized to nitrate nitrogen by NOB, inhibits the undue growth of NOB, maintains the superiority of AOB, guarantees the length of sewage treatment process
Phase stable operation, effectively reduces aeration and reaction time, has saved the energy consumption of operational process.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the multicycle changing rule figure of present invention DO and ORP when carrying out nitrification-denitrification reaction.
Fig. 3 is the monocycle variation diagram of present invention first derivative of DO and ORP when carrying out nitrification-denitrification reaction.
Fig. 4 is the monocycle of present invention Inlet and outlet water ammonia nitrogen concentration and ammonia nitrogen removal frank when carrying out nitrification-denitrification reaction
Schematic diagram.
Specific embodiment
As shown in Figure 1, short-cut nitrification-denitrification reaction unit of the present invention, the reaction including being equipped with blender 1
Kettle 2, the water inlet pipe being connected with intake pump 3 is communicated on reaction kettle 2, add the carbon source liquid that pump 4 is connected with carbon source and add pipe and
The drainpipe being connected with draining pump 5,2 bottom of reaction kettle are equipped with the microporous aeration disc 7 being connected with aerator 6, reaction kettle 2
Temp probe 8, pH probe 9, DO 10 and ORP of probe probe 11 are bolted on the preformed hole of top cover, and temp probe 8, pH pop one's head in
9, the signal output end of 10 and ORP of DO probe probe 11 is electrically connected with the signal input part of PLC respectively, the control output end of PLC
Added respectively with intake pump 3, carbon source pump 4, draining pump 5, aerator 6, blender 1, liquid crystal display control signal be electrically connected
It connects.When reaction, 2 domestic demand of reaction kettle retains the microorganism sludge suspension containing AOB and NOB of 60-80% volume, then basis
Real reaction situation controls the purified water discharge rate of each reaction time and the sewage inlet of next reaction time, usually
In the case of, sewage inlet and purified water discharge rate remain basically stable.In order to accurately measure, the head of above-mentioned probe is respectively positioned on autoclave body
Liquid level or less 6-7cm is reacted, for the ease of adjusting the rate of blender 1, blender 1 is connect with electrodeless variable-speed governor.It is above-mentioned
Microporous aeration disc 7 is made of stones at the 1/3-1/2 of a diameter of 2 diameter of reaction kettle can make the bubble of aeration uniform by high temperature sintering gas
Ground is distributed in reaction kettle 2.
When carrying out sewage treatment, lacked according to preaeration → water inlet → aerobic nitrification → additional aeration → carbon source liquid is added →
Oxygen denitrification → additional anoxic denitrification → precipitating → draining sequence carries out periodic short-cut nitrification-denitrification reaction,
In reaction process, using the first derivative of DO and the first derivative of ORP as real-time control parameter.By control system to the two
On-line monitoring adjusts the operating status of blender 1, aerator 6 and each pump in real time, controls the terminal of nitration reaction in time, prevents
The only undue growth of NOB reduces its competition dissolved oxygen with AOB, avoids damage to original biological community structure in reactor,
The operation steady in a long-term of realization device.
Specifically, it in the reaction time routinely carried out, follows the steps below：
The first step opens aerator 6 and blender 1, with the speed of 2-6L/min to reaction kettle 2（Usually 6L/min）It is interior lasting
It is passed through air, carries out preaeration, that is, remove after a reaction time the degradable organic carbon source in remaining part in kettle,
Mitigate the influence that organic carbon source reacts subsequent short distance nitration as much as possible, while guaranteeing the stability of real-time control signal；
With the progress of preaeration, the concentration of organic matter is fewer and fewer, and a large amount of heterotrophs enter endogenous respiration phase, oxygen consumption in sludge
Amount gradually reduces, and DO can be slightly elevated at this time（See Fig. 2）, the first derivative of DO will appear first peak value on liquid crystal display
（See Fig. 3）, at this point, opening intake pump 3, sewage is made to enter reaction kettle 2, inflow is the 10-15% of kettle volume, while stirring into
Row nitration reaction；
When carrying out nitration reaction, at nitrite nitrogen, therefore AOB consumes oxygen for mineralized nitrogen contained by sewage with constant rate
The concentration of DO is maintained at a lower level in a long time；With the progress of reaction, reaction rate is reduced, but due to aeration
Flow is constant, and therefore, DO will be slow raising；When close to nitration reaction terminal, AOB almost stagnates the consumption of DO, DO meeting at this time
It significantly increases suddenly, second peak value occurs in the first derivative of DO；Hereafter, into additional aeration phase, remaining a small amount of ammonia
Nitrogen continues to be oxidized under stirring, and reaction after twenty minutes, closes aerator 6.
Second step continues working blender 1, and opens carbon source and add the addition proper amount of carbon source liquid progress into kettle of pump 4
Anoxic denitrification reaction, above-mentioned carbon source liquid are any one of sodium acetate, methanol, ethyl alcohol, and additional amount is reaction kettle volume
0.3-0.5%；When peak value occurs in the first derivative of ORP（See Fig. 3）Afterwards, continuing stirring, to carry out within 20 minutes additional anoxic denitrification anti-
It answers, is then shut off blender 1, stand after ten minutes, open draining pump 5, draining, reaction was completed.
In the above-mentioned denitrification stage, the oxidation state species such as nitrite nitrogen, nitrate nitrogen in kettle are converted into nitrogen by denitrifying bacterium
Gas causes oxidation state species total amount to reduce, therefore the decline of ORP.As shown in Fig. 2, at initial stage in denitrification stage, under ORP is quick
Drop, with denitrifying progress, the fall off rate of ORP gradually tends towards stability, and until denitrification terminates, system enters anaerobic acid-production
The reproducibility small organic molecule acid in stage, generation can be such that ORP declines suddenly, and the first derivative of ORP is made a peak value occur（See figure
3）.
Since the time that the time of occurrence and ammonium oxidation of second peak value of first derivative of above-mentioned DO are completed coincides, and
Second peak value of first derivative of DO will not with water, water quality change and change（Test result about water quality is shown in Table 1）, because
This using the first derivative of DO as the control parameter of short distance nitration terminal be it is reasonable and stable, it is anti-that nitrification can be accurately controlled
The terminal answered prevents from excessively nitrifying.The rate of change of ORP be equally first quick and back slow, therefore use the first derivative of ORP as control
Parameter processed can be with the terminal of stability contorting anti-nitration reaction.
1 various concentration of table water inlet test result
After measured, the nitrite nitrogen in above-mentioned reaction process（N-NO2-）Accumulation rate（NAR）Up to 98% or more, at the end of reaction,
As shown in figure 4, ammonia nitrogen（N-NH4 +）Removal efficiency is up to 97% or more, N-NH in water outlet4 +<1.5mg N/L, denitrification effect are significant.
In specific implementation, for the activated sludge and sludge activity of separate sources, manual mode can be first passed through and controlled
System after finding suitable control parameter, carries out automatically controlling after several periods in input control system.
Claims (6)
1. a kind of short-cut nitrification-denitrification reaction unit, it is characterised in that：Reaction kettle including being provided with blender, it is described anti-
Answer and be communicated with the water inlet pipe being connected with intake pump on kettle, added with carbon source the carbon source liquid that is connected of pump add pipe and with draining pump phase
Drainpipe even, reactor bottom are provided with the microporous aeration disc being connected with aerator, are bolted with head on the top cover of reaction kettle
Portion be located at the temp probe of autoclave body liquid level or less 6-7cm, pH probe, DO probe and ORP probe, the temp probe, pH probe,
The signal output end of DO probe and ORP probe is electrically connected with the signal input part of PLC respectively, the control output end point of the PLC
Other and intake pump, carbon source add the control signal electrical connection of pump, draining pump, aerator, blender, liquid crystal display.
2. quick-starting direct short-cut nitrification-denitrification technique according to claim 1, it is characterised in that：The micropore exposes
The diameter of gas disk is the 1/3-1/2 of reaction kettle diameter.
3. quick-starting direct short-cut nitrification-denitrification technique according to claim 1, it is characterised in that：The blender
It is connected with electrodeless variable-speed governor.
4. a kind of production technology using short-cut nitrification-denitrification reaction unit described in claim 1, it is characterised in that：Packet
Include following steps：
The first step opens aerator and blender, and air is continually fed into reaction kettle, carries out pre-exposure solid/liquid/gas reactions, removes in kettle
Remaining organic carbon source in sludge；After first peak value occurs in the first derivative of DO, intake pump is opened, sewage is made to enter reaction
Kettle carries out nitration reaction while stirring；After second peak value occurs in the first derivative of DO, continues stirring and added for 20 minutes
Aeration reaction is then shut off aerator；
Second step continues working blender, opens carbon source and adds pump addition proper amount of carbon source liquid progress anoxic denitrification reaction,
20 minutes after peak value occurs in the first derivative of ORP, blender is closed, stands after ten minutes, opens draining pump, drain, terminate
Reaction.
5. quick-starting direct short-cut nitrification-denitrification technique according to claim 4, it is characterised in that：The air
Aeration speed is 2-6L/min, and sludge quantity containing bacterium is the 60-80% of reactor volume, and wastewater influent amount is the 10- of reactor volume
15%, carbon source Liquid addition is the 0.3-0.5% of reactor volume.
6. quick-starting direct short-cut nitrification-denitrification technique according to claim 4, it is characterised in that：The carbon source liquid
Body is any one of sodium acetate, methanol, ethyl alcohol.
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1850657A (en) * | 2006-06-01 | 2006-10-25 | 北京工业大学 | Control apparatus and method for pulse water-feeding SBR deep denitrogenation process and course |
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