CN102101720B - Device and method for denitrification of single stage autotroph in low-cellulose nitrate (CN) high-ammonia nitrogen waste water - Google Patents
Device and method for denitrification of single stage autotroph in low-cellulose nitrate (CN) high-ammonia nitrogen waste water Download PDFInfo
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Abstract
The invention discloses a device and a method for denitrification of single stage autotroph in low-cellulose nitrate (CN) high-ammonia nitrogen waste water. The device comprises a raw water tank, a water inlet pump, a reactor, a secondary sedimentation tank and a sludge reflux pump, wherein overcurrent holes are arranged in the water flow direction of the reactor in an up-and-down alternative form and connected with various grid chambers, an anoxic zone grid chamber is arranged at the front end of the reactor, and an aerobic zone grid chamber is arranged at the back end of the reactor; the anoxic zone grid chamber is provided with a stirrer and an agitator blade; the aerobic zone grid chamber is provided with the stirrer, the agitator blade, an aeration riser pipe and an intermediate perforated clapboard; and the aeration riser pipe is internally provided with an aeration head, and sponge filling material is filled below the intermediate perforated clapboard, wherein filling ratio is 30-50%. In the method, shortcut nitrification is achieved above the aerobic zone through low dissolved oxygen (DO is 0.5 <-1>mg/L) and free ammonia (FA) inhibition so that ammonia nitrogen is converted to nitrite nitrogen; and anoxicammoxidation biomembrane acts on the lower part of the aerobic zone, the nitrite nitrogen and ammonia nitrogen are converted to nitrogen, thereby achieving denitrification of autotroph. The method has the advantages of low oxygen consumption, less sludge output and no extra carbon source.
Description
Technical field
The present invention relates to a kind of apparatus and method of low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion, belong to the biological wastewater treatment technology field, be applicable to the low CN high ammonia-nitrogen wastewaters such as municipal sewage sludge Digestive system, breeding wastewater, gourmet powder waste water, percolate, wastewater from chemical industry, and the high ammonia-nitrogen wastewater denitrification of autotrophic organism that has carried out after the carbonization treatment is processed.
Background technology
The body eutrophication problem becomes increasingly conspicuous, and has been had a strong impact in recent years resident's daily life by the series of problems of its initiation.Therefore nitrogen is the important factor that causes body eutrophication, controls that the nitrogen qualified discharge just seems particularly important in the sewage.Bio-denitrification technology is the most widely sewage water denitrification technology of current application, has both realized the removal of nitrogen by nitrifier and denitrifying bacteria, and sufficient carbon source is the key of denitrifying bacteria efficient denitrification.And when former water CN ratio was lower than 3.4, former water carbon source can't satisfy denitrification to the demand of organic carbon source, need add outer carbon source and satisfy this requirement, to guarantee Nitrogen removal effect.And the CN of the low CN high ammonia-nitrogen wastewaters such as sludge digestion liquid, wastewater from chemical industry, breeding wastewater, percolate is than being lower than this value.Therefore in the existing low CN high ammonia-nitrogen wastewater biological denitrification process, in order to reach the emission standard of nitrogen, usually need to add the organic carbon sources such as methyl alcohol or ethanol, so both consume limited organic resource, increase again the working cost of Sewage Plant.
The appearance of Anammox technology is so that low CN high ammonia-nitrogen wastewater realizes efficiently being treated as possibility under the condition that does not add outer carbon source.Anammox directly carries out oxidation to ammonia nitrogen with nitrite as electron acceptor(EA), need not organic carbon source, and therefore low CN is than the removal that can not affect TN.In addition, Anammox carries out under the condition of anaerobism, need not the supply of oxygen, can reduce operation energy consumption; The Anammox bacteria growing is slow, productive rate is low, and the technique excess sludge production is few, can reduce the sludge treatment expense; The anaerobic ammonia oxidizing bacteria metabolic activity is high, strong to matrix avidity, and the process volume transformation efficiency is high, can reduce capital cost.Therefore the Anammox technology adapts to the water quality of low CN high ammonia-nitrogen wastewater, can save operation and capital cost.
Whether the denitrification of autotrophic organism technology is divided into two kinds according to short distance nitration and Anammox in same reactor: two-stage autotrophic denitrification technology, be that short distance nitration carries out in two different reactors respectively with Anammox, such as SHARON+ANAMMOX technique; One-step autotrophic nitrogen removal technique, namely short distance nitration and Anammox carry out in same reactor respectively, such as CANON technique and OLAND technique etc.The characteristics such as one-step autotrophic nitrogen removal technique is simple because of its technical process, and energy consumption is low, and surplus sludge volume is few, and be considered to sustainable sewage autotrophic denitrification technology.But because short distance nitration and Anammox carry out in same reactor, just so that there is a certain amount of oxygen in the reactor, dissolved oxygen concentration (DO) is high can to suppress the anaerobic ammonia oxidizing bacteria activity, (DO) is low for dissolved oxygen concentration, meeting is so that ammonia oxidation bacteria (AOB) substrate (oxygen) deficiency, nitrification activity reduces, so there is the contradiction to the oxygen demand in one-step autotrophic nitrogen removal technique, limit value the performance of its nitrogen removal performance.
Summary of the invention
The present invention seeks in order to solve the problems of the technologies described above the apparatus and method of a kind of low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion of proposition.Utilize these apparatus and method not need any pre-treatment, in active sludge and the symphyogenetic reactor of microbial film, by the Anammox Main Bacteria is fixed on the sponge filler, ammonia oxidation bacteria (AOB) mainly is present in the suspension flco active sludge (abbreviation active sludge), thereby ammonia oxidation bacteria (AOB) and anaerobic ammonia oxidizing bacteria are separated; By the structure of reactor subregion Anammox microbial film is limited in bottom, reactor lattice chamber, and the dissolved oxygen in the mixed solution runs out of substantially at aerobic zone, Anammox district, bottom DO can be lower than 0.2mg/L, therefore reduce dissolved oxygen to the impact of anaerobic ammonia oxidizing bacteria, finally realize efficient autotrophic denitrification purpose.This invention has not only solved the contradiction of existing technique, and has the simple characteristics of fluctuation, flexible operation that technical process is simple, adapt to sludge digestion and water quality and quantity, can reduce process operation expense and capital cost, avoids simultaneously secondary pollution.
The objective of the invention is to solve by the following technical programs: a kind of apparatus and method of low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion are provided with former water tank, intake pump, reactor, second pond, sludge reflux pump.Described former water tank is a uncovered casing, is provided with upflow tube and blow-down pipe; Described reactor is a uncovered pond body, be divided into several lattice chambers, connect each lattice chamber according to the water (flow) direction flowing hole that is crisscross arranged up and down, front end is lattice chamber, oxygen-starved area, and the rear end is aerobic zone lattice chambers, lattice chamber, oxygen-starved area is provided with agitator and stirring rake, aerobic zone lattice chamber also is provided with air compressor machine, gas meter, aeration upspout, middle Perforated clapboard except agitator and stirring rake are set, in the aeration upspout aeration head is set, middle Perforated clapboard below filling sponge filler, packing ratio is 30-50%; Described second pond is the vertical-flow second pond of a middle water inlet, is provided with rising pipe, returned sluge tube valve and excess sludge discharge tube valve.
Former water tank is connected with the reactor water intaking valve by intake pump; Reactor is connected with second pond by the second pond pipe connecting; Second pond is connected with the reactor water intaking valve by sludge reflux pump.
In the device of the present invention, the treatment scheme of low CN high ammonia-nitrogen wastewater is as follows: former water and returned sluge are the 30%-200% of water inlet, enter simultaneously the feed-water end of reactor.Reactor is equally divided into 5 lattice chambers, and the apposition chamber does not link to each other by staggered up and down aperture.The 1st lattice chamber of reactor is the oxygen-starved area, stirs by agitator muddy water is mixed, and keeps good mass transfer.Realize denitrification in the oxygen-starved area by active sludge, follow-up Anammox is produced
Transform nitrogen.Next 4 lattice chambers are aerobic zone, and are indoor at aerobic lattice, realize short distance nitration by suspension flco active sludge, will
Be converted into
Then passing through the Anammox microbial film will
With
Be converted into nitrogen and
The mixed solution that aerobic zone flows out flows into second pond, carries out mud-water separation, and to reactor front end oxygen-starved area, part mud is as excess sludge discharge by sludge reflux pump for part mud.The second pond supernatant liquor is discharged as processing water outlet.
The invention provides a kind of said apparatus that utilizes and realize low CN high ammonia-nitrogen wastewater short distance nitration, then realize the method for denitrification of autotrophic organism by Anammox, may further comprise the steps:
1) start-up system: Perforated clapboard is with lower area in the middle of at first new sponge filler or the sponge filler that hung up properly the Anammox film being added to the reactor aerobic zone, and packing ratio is 30-50%; Active sludge is taken from urban sewage plant aeration tank and is had the active sludge of nitrification or the active sludge of short distance nitration system, joins in the reactor, and adding rear activated sludge concentration MLSS is 2000-4000mg/L.
Adjustment operation is as follows when 2) moving:
(1) according to pH value and the temperature of mixed solution in mud waste water water quality and the reactor, by at 0.2-2kg
-N/m
3D
-1Scope in, adjust water inlet
Load is namely adjusted flooding velocity and change return sludge ratio (adjusting) in the 30%-200% scope, when free ammonia (FA) when concentration is high, increases return sludge ratio, and making reactor is 1-40mg/L along the FA concentration of journey.
(2) keep each lattice chamber of aerobic zone
Concentration is 3-10mg/L.When
Concentration at first improves nitrosification speed by increasing aeration rate, and then improves during less than 3mg/L
Concentration; If increasing aeration rate can not improve
Concentration then improves aeration upspout volume and aeration rate simultaneously, and then it is indoor to improve lattice
Concentration.When lattice indoor
Concentration then reduces aeration rate or reduces aeration upspout volume during greater than 10mg/L.
(3) keep water outlet
Concentration and TN remove the ratio q of concentration less than 0.15.When q greater than 0.15 the time, by reducing aerobic zone dissolved oxygen DO concentration, reduce sludge age SRT, suppress the growth of NOB (NOB), the difference of ammonia oxidation bacteria (AOB) rate of rise and NOB rate of rise is increased, the keeping of promotion short distance nitration.
(4) reduce the tactful as follows of aerobic zone DO concentration: under the prerequisite that guarantees air lift up-flow effect, reduce aeration rate, and then reduce DO; When if above method is invalid, by reducing simultaneously aeration upspout volume and reducing aeration rate and reduce DO.
(5) keep water outlet
Concentration is less than 15mg/L.Work as water outlet
Concentration by improving hydraulic detention time (HRT), namely reduces flooding quantity during greater than 15mg/L, lowers water outlet
Concentration.
Know-why:
Low CN high ammonia-nitrogen wastewater and returned sluge enter reactor anoxia cell chamber, utilize carbon source limited in the former water at this regional ammonia oxidation bacteria (AOB), in returned sluge
Be converted into nitrogen.Subsequently, muddy water mixed solution enters aerobic lattice chamber, and to the muddy water mixed solution oxygenation, the while is because gas stripping forms up and down circulation by the aeration upspout.The short distance nitration effect occurs on top, aerobic lattice chamber in mixed solution, will
Be converted into
Consume simultaneously dissolved oxygen.When treating that its circulation flows into floating stuffing zone, bottom, the anaerobic ammonia oxidizing bacteria on the floating stuffing will
With
Be converted into nitrogen, realize denitrogenation.Because dissolved oxygen is exhausted substantially in top short distance nitration district in the mixed solution, thus bottom Anammox zone dissolved oxygen DO＜0.2mg/L, thus reduced the inhibition of dissolved oxygen to anaerobic ammonia oxidizing bacteria, it is active to have improved the bottom anaerobic ammonia oxidizing bacteria.
There is gap in free ammonia (FA) to ammonia oxidation bacteria (AOB) and NOB (NOB) inhibition concentration, FA begins to suppress NOB when being 0.1-1.0mg/L, just begin to suppress AOB during 10-150mg/L, based on this phenomenon, the present invention realizes that FA suppresses NOB, and does not suppress AOB by FA concentration in the control reactor within the specific limits, thereby eluriate NOB, realize short distance nitration.
The environment that aerobic/anoxic of while replaces is conducive to realize short distance nitration, and this is because behind the experience aerobic environment, and NOB needs certain hour ability activity recovery, and AOB can the immediate recovery activity.Just realized constantly replacing of aerobic/anoxic by arranging of aeration upspout in the present invention, in the aeration upspout, it is high-solubility oxygen, aerobic zone top low dissolved axygen then is in anaerobic environment substantially in bottom Anammox district, so this setting also is conducive to realize short distance nitration.
The apparatus and method of low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion of the present invention are compared with existing technique and are had the following advantages:
1, realized separating of ammonia oxidation bacteria (AOB) and anaerobic ammonia oxidizing bacteria, anaerobic ammonia oxidizing bacteria is mainly grown at floating stuffing, and ammonia oxidation bacteria (AOB) is mainly grown in suspension flco mud, therefore ammonia oxidation bacteria (AOB) can be controlled at different sludge ages with anaerobic ammonia oxidizing bacteria, thereby be beneficial to the regulation and control of technique, be conducive to the stable realization of short distance.
2, aerobic zone is configured with the raising that is beneficial to Anammox efficient, because oxygenation capacity can be exhausted on aerobic zone top substantially in the aeration upspout, Anammox zone, bottom DO＜0.2mg/L, thus the inhibition of dissolved oxygen to the bottom anaerobic ammonia oxidizing bacteria reduced.
3, by the adjustment of return sludge ratio, Anammox can be produced
Removed by denitrification in the oxygen-starved area, therefore, compare with the ordinary single-stage autotrophic denitrification, can realize higher TN clearance.
4, compare with traditional complete nitrification and denitrification biological denitrification process, denitrification of autotrophic organism can be saved 58% oxygen-consumption; But reduce mud output, and then reduce the sludge treatment expense.
Description of drawings
Fig. 1 is the structural representation of this device
Among the figure, 1, former water tank; 2, intake pump; 3, reactor; 4, second pond; 5, sludge reflux pump; 1.1, upflow tube; 1.2, blow-down pipe; 3.1, the reactor water intaking valve; 3.2, air compressor machine; 3.3, gas meter; 3.4, airline; 3.5, gas valve; 3.6, the aeration tube gas valve; 3.7, agitator; 3.8, stirring rake; 3.9, the aeration upspout; 3.10, aeration head; 3.11, sponge filler; 3.12, middle Perforated clapboard; 3.13, reactor rising pipe valve; 3.14, the second pond pipe connecting; 4.1, rising pipe; 4.2, the sludge reflux valve; 4.3, the excess sludge discharge valve.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples: as scheme shown in it, a kind of apparatus and method of low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion is characterized in that: be provided with former water tank 1, intake pump 2, reactor 3, second pond 4, sludge reflux pump 5.Described former water tank 1 is a uncovered casing, is provided with upflow tube 1.1 and blow-down pipe 1.2; Described reactor 3 is a uncovered pond body, its inner chamber is divided into several lattice chambers, connect each lattice chamber according to the water (flow) direction flowing hole that is crisscross arranged up and down, front end is lattice chamber, oxygen-starved area, the rear end is aerobic zone lattice chambers, lattice chamber, oxygen-starved area is provided with agitator 3.7 and stirring rake 3.8, aerobic zone lattice chamber is except arranging agitator 3.7 and stirring rake 3.8, also be provided with air compressor machine 3.2, gas meter 3.3, aeration upspout 3.9, middle Perforated clapboard 3.12, the aeration upspout 3.9 interior aeration heads 3.10 that arrange, middle Perforated clapboard 3.12 below filling sponge fillers 3.11, packing ratio is 30-50%; Described second pond is the vertical sedimentation basin of a middle water inlet, is provided with rising pipe 4.1, returned sluge tube valve 4.2 and excess sludge discharge tube valve 4.3.
Adopt the low CN high ammonia-nitrogen wastewater of typical case-sludge digestion liquid to test, sludge digestion liquid is taken from Gaobeidian City, Beijing Sewage Plant digested sludge dehydration machine room, and its concrete water-quality guideline is as follows: COD is 80-245mg/L;
Be 125-300mg/L,
-N≤1.5mg/L,
Below detectability,
Be 7.8-34.7mg/L, basicity is 870-1600mg/L, and pH is 6.9-8.5.Pilot system mainly contains inlet chest, reactor and second pond and forms as shown in Figure 1.The reactor useful volume is 36L, and reactor size is L * B * H=60 * 12 * 50cm, is equally divided into 5 lattice chambers, and lattice interventricular septum plate is connected by staggered up and down aperture.
Concrete operation method is as follows:
Perforated clapboard is with lower area in the middle of at first new sponge filler being added to the reactor aerobic zone, and packing ratio is 30-50%; Active sludge can be taken from the active sludge that urban sewage plant aeration tank has nitrification, joins in the reactor, and adding rear activated sludge concentration MLSS is 2000-4000mg/L.Fresh sludge digestion liquid is joined former water tank, start intake pump, flooding quantity is controlled at 36L/d; The while turn on agitator, aerating system; When treating that second pond begins to be full of muddy water mixed solution, open sludge reflux pump, return sludge ratio is 50% to be 18L/d;
The indexs such as each lattice chamber of the regular detection reaction device of run duration and Inlet and outlet water water quality and temperature, pH.Keep water outlet
Concentration is less than 15mg/L.Work as water outlet
Concentration by improving hydraulic detention time HRT, namely reduces flooding quantity during greater than 15mg/L, lowers water outlet
Concentration.
When lattice chamber, oxygen-starved area FA concentration during greater than 20mg/L, increase return sludge ratio.When
Concentration at first improves nitrosification speed by increasing aeration rate, and then improves during less than 3mg/L
Concentration; If increasing aeration rate can not improve
Concentration then improves aeration upspout volume and aeration rate simultaneously, and then it is indoor to improve lattice
Concentration.When lattice indoor
Concentration then reduces aeration rate or reduces aeration upspout volume during greater than 10mg/L.
Keep water outlet
Concentration and TN remove the ratio q of concentration less than 0.15.When q greater than 0.15 the time, by reducing aerobic zone dissolved oxygen DO concentration, reduce sludge age SRT, suppress the growth of NOB (NOB), the difference of ammonia oxidation bacteria (AOB) rate of rise and NOB rate of rise is increased, the keeping of promotion short distance nitration.
Reduce the tactful as follows of aerobic zone DO concentration: under the prerequisite that guarantees air lift up-flow effect, reduce aeration rate, and then reduce DO; When if above method is invalid, by reducing simultaneously aeration upspout volume and reducing aeration rate and reduce DO.
Long run test result shows: after stable, and the reactor water outlet
Concentration is 6-15mg/L,
Remove load and be 0.23-0.28kgN/m
3D
-1, TN removes load and is about 0.19-0.22kgN/m
3D
-1Effluent COD concentration is 50-73mg/L, the organism of substantially awkward biological utilisation.
Claims (2)
1. the device of one kind low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion is characterized in that: be provided with former water tank (1), intake pump (2), reactor (3), second pond (4), sludge reflux pump (5); Described former water tank (1) is a uncovered casing, is provided with upflow tube (1.1) and blow-down pipe (1.2); Described reactor (3) is a uncovered pond body, be divided into several lattice chambers, connect each lattice chamber according to the water (flow) direction flowing hole that is crisscross arranged up and down, front end is lattice chamber, oxygen-starved area, the rear end is aerobic zone lattice chambers, lattice chamber, oxygen-starved area is provided with agitator (3.7) and stirring rake (3.8), aerobic zone lattice chamber is except arranging agitator (3.7) and stirring rake (3.8), also be provided with air compressor machine (3.2), gas meter (3.3), aeration upspout (3.9), middle Perforated clapboard (3.12), aeration head (3.10) is set in the aeration upspout (3.9), middle Perforated clapboard (3.12) below filling sponge filler (3.11), packing ratio is 30-50%; Described second pond is the vertical sedimentation basin of a middle water inlet, is provided with rising pipe (4.1), returned sluge tube valve (4.2) and excess sludge discharge tube valve (4.3);
Former water tank (1) is connected with reactor water intaking valve (3.1) by intake pump (2); Reactor (3) is connected with second pond (4) by second pond pipe connecting (3.14); Second pond (4) is connected with reactor water intaking valve (3.1) by sludge reflux pump (5);
For realizing low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion, utilize the device of low CN high ammonia-nitrogen wastewater one-step autotrophic biological denitrificaion, the method for employing is:
1) start-up system: Perforated clapboard is with lower area in the middle of at first new sponge filler or the sponge filler that hung up properly the Anammox film being added to the reactor aerobic zone, and packing ratio is 30-50%; Active sludge is taken from the active sludge that urban sewage plant aeration tank has nitrification, joins in the reactor, and adding rear activated sludge concentration MLSS is 2000-4000mg/L;
Adjustment operation is as follows when 2) moving:
2.1) according to pH value and the temperature of mixed solution in low CN high ammonia-nitrogen wastewater water quality and the reactor, by at 0.2-2kgNH
4 +-N/m
3In the scope of d, adjust water inlet NH
4 +-N load is namely adjusted flooding velocity and is changed return sludge ratio in the 30%-200% scope, when free ammonia FA concentration is high, increases return sludge ratio, and keeping reactor is 1-40mg/L along the FA concentration of journey;
2.2) keep each lattice chamber NO of aerobic zone
2 --N concentration is 3-10mg/L; Work as NO
2 --N concentration at first improves nitrosification speed by increasing aeration rate, and then improves NO during less than 3mg/L
2 --N concentration; Can not improve NO if increase aeration rate
2 --N concentration then improves aeration upspout volume and aeration rate simultaneously, and then improves the indoor NO of lattice
2 --N concentration; As the indoor NO of lattice
2 --N concentration then reduces aeration rate or reduces aeration upspout volume during greater than 10mg/L;
2.3) keep water outlet NO
3 --N concentration and TN remove the ratio q of concentration less than 0.15; When q greater than 0.15 the time, by reducing aerobic zone dissolved oxygen DO concentration, reduce sludge age SRT, suppress the growth of NOB NOB, the difference of ammonia oxidation bacteria AOB rate of rise and NOB rate of rise is increased, the keeping of promotion short distance nitration;
2.4) reduce the tactful as follows of aerobic zone DO concentration: under the prerequisite that guarantees air lift up-flow effect, reduce aeration rate, and then reduce DO; When if above method is invalid, by reducing simultaneously aeration upspout volume and reducing aeration rate and reduce DO;
2.5) keep water outlet NH
4 +-N concentration is less than 15mg/L; As water outlet NH
4 +-N concentration by improving hydraulic detention time HRT, namely reduces flooding quantity during greater than 15mg/L, reduces water outlet NH
4 +-N concentration.
2. utilize one-step autotrophic biological denitrification apparatus claimed in claim 1 to realize the method for low CN high ammonia-nitrogen wastewater denitrification of autotrophic organism, it is characterized in that comprising following content:
1) start-up system: Perforated clapboard is with lower area in the middle of at first new sponge filler or the sponge filler that hung up properly the Anammox film being added to the reactor aerobic zone, and packing ratio is 30-50%; Active sludge is taken from the active sludge that urban sewage plant aeration tank has nitrification, joins in the reactor, and adding rear activated sludge concentration MLSS is 2000-4000mg/L;
Adjustment operation is as follows when 2) moving:
2.1) according to pH value and the temperature of mixed solution in low CN high ammonia-nitrogen wastewater water quality and the reactor, by at 0.2-2kg NH
4 +-N/m
3In the scope of d, adjust water inlet NH
4 +-N load is namely adjusted flooding velocity and is changed return sludge ratio in the 30%-200% scope, when free ammonia FA concentration is high, increases return sludge ratio, and keeping reactor is 1-40mg/L along the FA concentration of journey;
2.2) keep each lattice chamber NO of aerobic zone
2 --N concentration is 3-10mg/L; Work as NO
2 --N concentration at first improves nitrosification speed by increasing aeration rate, and then improves NO during less than 3mg/L
2 --N concentration; Can not improve NO if increase aeration rate
2 --N concentration then improves aeration upspout volume and aeration rate simultaneously, and then improves the indoor NO of lattice
2 --N concentration; As the indoor NO of lattice
2 --N concentration then reduces aeration rate or reduces aeration upspout volume during greater than 10mg/L;
2.3) keep water outlet NO
3 --N concentration and TN remove the ratio q of concentration less than 0.15; When q greater than 0.15 the time, by reducing aerobic zone dissolved oxygen DO concentration, reduce sludge age SRT, suppress the growth of NOB NOB, the difference of ammonia oxidation bacteria AOB rate of rise and NOB rate of rise is increased, the keeping of promotion short distance nitration;
2.4) reduce the tactful as follows of aerobic zone DO concentration: under the prerequisite that guarantees air lift up-flow effect, reduce aeration rate, and then reduce DO; When if above method is invalid, by reducing simultaneously aeration upspout volume and reducing aeration rate and reduce DO;
2.5) keep water outlet NH
4 +-N concentration is less than 15mg/L; As water outlet NH
4 +-N concentration by improving hydraulic detention time HRT, namely reduces flooding quantity during greater than 15mg/L, reduces water outlet NH
4 +-N concentration.
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