CN103833134B - Method for achieving short-cut denitrification by continuous flow sewage treatment system - Google Patents
Method for achieving short-cut denitrification by continuous flow sewage treatment system Download PDFInfo
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- CN103833134B CN103833134B CN201410081091.6A CN201410081091A CN103833134B CN 103833134 B CN103833134 B CN 103833134B CN 201410081091 A CN201410081091 A CN 201410081091A CN 103833134 B CN103833134 B CN 103833134B
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- 239000010865 sewage Substances 0.000 title claims abstract description 43
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Abstract
The invention discloses a method for achieving short-cut denitrification by a continuous flow sewage treatment system, and belongs to the field of biological sewage treatment. The short-cut denitrification is an economical and efficient biological sewage nitrogen removal method, and is achieved in an intermittent denitrification treatment system at present, but is difficultly achieved by most of continuous flow treatment systems for nitrogen and phosphorus removal in practical application due to the complexity of operation and control. By adopting the continuous flow nitrogen and phosphorus removal system for processing domestic sewage, the short-cut denitrification is achieved by controlling the sludge return ratio, the nitrated liquid reflux ratio and the hydraulic retention time of an aerobic zone under the operation condition that the dissolved oxygen concentration at normal temperature is 1-2mg/L, the accumulation rate of nitrite is stably maintained at 90%, the ammonium-nitrogen removal rate can be up to over 95%, and the total phosphorus removal rate can be up to over 90%. By adopting the method, the problem that the short-cut denitrification is applied to the biological sewage nitrogen and phosphorus removal system for the continuous flow in the past is solved, the application range of the short-cut denitrification is expanded, and the method can be used for guiding the biological sewage nitrogen and phosphorus removal system for the continuous flow to achieve operation and control of the short-cut denitrification.
Description
Technical field
The present invention relates to a kind of method that continuous flow sewage biological treatment system realizes short-cut denitrification, belong to field of biological sewage treatment.
Background technology
Body eutrophication has become global water environmental problems, and its one of the main reasons is the excessive emissions of compound fertilizer.For controlling compound fertilizer excessive emissions to the destruction of the natural water eubiosis, many countries all strictly limit the nitrogen, the phosphorus amount that enter natural water body." urban wastewater treatment firm pollutant emission standard " (GB18918-2002) discharge index to nitrogen, phosphorus that China formulates proposes more strict requirement, wherein first discharge standard (A standard) regulation ammonia nitrogen concentration is no more than 5mg/L, and total phosphorus concentration is no more than 0.5mg/L.Therefore, namely the research and development of sewage denitrification and dephosphorization new theory, new technology tally with the national condition, and are again the study hotspot of sewage treatment area and international forward position.
In recent years, a series of sewage denitrification and dephosphorization new theory is created, as short-cut nitrification-denitrification, synchronous nitration and denitrification, Anammox, denitrification dephosphorization etc.Wherein short-cut denitrification efficient, economical, energy-conservation with it, be easy to the advantages such as engineering practice and be subject to extensive concern.Traditional biological denitrificaion comprises nitrification and denitrification 2 reaction process.Wherein first nitrated part is by NH by ammonia oxidation bacteria (Ammonia Oxidizing Bacteria, AOB)
4 +-N is oxidized to NO
2 -the ammonia oxidation process of-N; Then be by NO by NOB (Nitrite OxidizingBacteria, NOB)
2 --N is oxidized to NO
3 -the nitrite nitrogen oxidising process of-N.Finally by the NO that the denitrification of denitrifying bacterium will produce
3 --N is converted into N
2.Wherein NO
2 --N is the intermediate product of nitrification and denitrification 2 processes.If by NH
4 +-N oxidation control at Nitrification Stage, then by denitrification by NO
2 --N is reduced to N
2, through NH
4 +-N → NO
2 --N → N
2such approach completes denitrogenation, i.e. short-cut denitrification approach.Short-cut denitrification, compared with omnidistance denitrogenation, shortens the reaction times, and can save the oxygen-supplying amount of about 25%, carbon source needed for the denitrification of saving about 40%, reduces sludge creation amount, directly reduces sewage disposal expense.
The key realizing short-cut denitrification is the activity or the growth velocity that suppress NOB, the quantity of AOB or activity is caused to preponderate in nitrification, make the ammonia oxidation speed rate in Sludge System be greater than intrasystem nitrite nitrogen rate of oxidation, thus cause the accumulation of nitrite.Research finds free ammonia FA(FreeAmmonia), free nitrous FNA(Free Nitrous Acid), pH value, temperature, DO concentration and inhibitor etc. can both affect metabolic activity and the growth velocity of AOB and NOB.
The present invention achieves short-cut denitrification in a kind of continuous flow sewage biological carbon and phosphorous removal system, is different from prior art technically, is mainly reflected in following four aspects:
(1) operation scheme of technique.Biologic process for treating sewage mainly contains two kinds of operation scheme, i.e. batch process and continuous flow process.Current short-cut denitrification mainly realizes in step technique, and this is because batch process regulate and control operation is comparatively flexible, especially simple to the control in reaction times, is convenient to take regulation measure adjust operation state.The continuous flow process extensively adopted for large-scale city sewage work is difficult to realize short-cut denitrification, and mainly because continuous flow process regulate and control operation is more complicated, variable controlled variable is few, and control measures and measure are different from batch process completely.The present invention mainly studies the method realizing short-cut denitrification in continuous flow sewage biological carbon and phosphorous removal system.
(2) condition of water quality.Higher water temperature (30 DEG C ~ 38 DEG C) easily realizes short distance nitration.The selection of free ammonia FA suppresses approach to be also the main path realizing short distance nitration.Therefore, limited research report mainly concentrates on the process of the percolate of the higher anaerobic sludge digestion liquid of water temperature and high ammonia-nitrogen content.And for actual cities sewage, water temperature does not reach the ideal temperature realizing short-cut denitrification, low ammonia nitrogen concentration also cannot form the Selective depression of free ammonia.Therefore, actual cities Sewage treatment systems is extremely difficult realizes short-cut denitrification.The present invention mainly studies the method realizing short-cut denitrification in the continuous-flow system of process actual cities sewage.
(3) control measures.The control measures applied in engineering practice about short-cut denitrification at present mainly contain high temperature, high free ammonia FA suppression, low aeration rate (or low DO concentration), based on DO, ORP, pH Online Monitoring Control reaction times.The continuous-flow system of the present invention owing to being process actual cities sewage, does not possess the condition of water quality of high temperature and high free ammonia FA suppression, cannot pass through DO, ORP, pH Online Monitoring Control reaction times yet.The control measures that existing continuous-flow system realizes short-cut denitrification have the low DO concentration in aerobic zone to control.But find in application that low DO runs the activity that also inhibits AOB, ammonia oxidation speed rate and ammonia nitrogen removal frank are significantly declined; If when DO is brought up to 1.0mg/L, short distance nitration is destroyed rapidly.The continuous flow process that above-mentioned phenomenon describes Treating Municipal Sewage realizes short distance nitration and ensures that denitrification effect is more difficult.Continuous flow process in the present invention runs and realizes short-cut denitrification fast under the condition of normal DO concentration (1-2mg/L), has no relevant report.
(4) target contaminant processed.Research report at present about short-cut denitrification is all realize in simple bio-denitrifying sewage system.The invention relates to and how realize short-cut denitrification in bio-denitrifying sewage dephosphorization system, because system has phosphorus removal functional concurrently, regulate and control operation is more complicated, is more difficult to realize short-cut denitrification.Sewage work just because of reality often all has the function of denitrogenation dephosphorizing simultaneously, and therefore the present invention has stronger directive significance to the short-cut denitrification application in Practical Project.For improving the removal effect of phosphorus, setting up pre-oxygen-starved area before continuous-flow system of the present invention, for by from the nitric nitrogen in second pond returned sluge and nitrite nitrogen denitrification, having eliminated the disadvantageous effect to anaerobic phosphorus release.Raw waste water 1/3 enters pre-oxygen-starved area, and 2/3 enters anaerobic zone.The organic carbon source that can make full use of in raw waste water is shunted in water inlet, ensures that the carbon source demand of phosphorus is put in pre-oxygen-starved area denitrification and anaerobic zone.
Summary of the invention
The object of the present invention is to provide and a kind ofly process the Continuous Flow biological carbon and phosphorous removal system of actual sewage and realize the method for short-cut denitrification, to starting in the continuous-flow system of process actual sewage and maintaining short-cut denitrification, solve the technical barrier being applied to by short-cut denitrification in the past and encountering in the continuous-flow system of process actual sewage, expand the range of application of short-cut denitrification.
A kind of continuous flow sewage biological carbon and phosphorous removal system, be made up of Round Sump reactor and second pond, Round Sump reactor is divided into pre-oxygen-starved area, anaerobic zone, oxygen-starved area and aerobic zone in turn; It is characterized in that: pre-oxygen-starved area, anaerobic zone, oxygen-starved area and aerobic zone volume ratio are 1:2:3.5:4; Pre-oxygen-starved area, anaerobic zone, oxygen-starved area and aerobic zone are communicated by overflow weir; Nitrification liquid return line and nitrification liquid reflux pump is connected between aerobic zone and oxygen-starved area; Be connected mud return line and sludge reflux pump bottom second pond with between pre-oxygen-starved area, second pond connects water shoot and excess sludge pipe; Water inlet pipe and water inlet peristaltic pump is connected between foul water tank with anaerobic zone; Water inlet pipe is connected and peristaltic pump of intaking between foul water tank with pre-oxygen-starved area; Agitator is installed in pre-oxygen-starved area, anaerobic zone and oxygen-starved area; Be provided with DO determinator in aerobic zone, aeration head is installed in bottom; Air flowmeter is connected between pneumatic pump and aeration head.
Apply the method that described a kind of continuous flow sewage biological carbon and phosphorous removal system realizes short-cut denitrification, it is characterized in that: 1/3 of the sewage water yield enters pre-oxygen-starved area, and 2/3 enters anaerobic zone; Under normal temperature, realize short-cut denitrification by regulation and control return sludge ratio, mixed liquid recycle ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, whole process is divided into following 3 stages:
Control that return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 2mg/L, aerobic zone hydraulic detention time 3.4h the stage I, treat aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent rises to 60% ~ 70% and enters the stage II.
Control that return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 1.5mg/L, aerobic zone hydraulic detention time 3.4h the stage II, treat aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent reaches 80% ~ 90% and enters stage III.
Stage III control return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 1.0mg/L, aerobic zone hydraulic detention time 3.4h, aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent reaches more than 90%.
To start in the Continuous Flow denitrification dephosphorization system of process actual sewage in the present invention and the principle of work maintaining short-cut denitrification is:
(1) aerobic hydraulic detention time.There are some researches show, even stable short distance nitration system, excess aeration also can cause the progressive failure of short distance nitration effect.This shows that strictly controlling aeration time is realize the very important factor of short distance nitration.Native system short distance nitration unloading phase, reduce aerobic HRT can anti-locking system overexposure gas, the effectively growth of restriction NOB, the elutriation of accelerating system to NOB and the enrichment of AOB.By increasing flooding velocity, although the ammonia nitrogen removal frank of system reduces, improve the ammonia nitrogen loading of system, being conducive to the dominant growth of AOB.
(2) mixed liquid recycle ratio and return sludge ratio.Independent control aerobic HRT and system SRT can not start short-cut denitrification in the present system.Shortening the actual hydraulic detention time in aerobic zone by the larger mixed liquid recycle ratio (200%) of control and return sludge ratio (60%) is the key that the present invention realizes short-cut denitrification.Larger mixed liquid recycle ratio and return sludge ratio accelerate mud mixture in aerobic and oxygen-starved area alternately.The NO generated in aerobic zone
2 --N can be removed by denitrification timely in oxygen-starved area; Prevent in longer aerobic actual hydraulic detention time situation, NO
2 --N is oxidized to NO in aerobic zone further by NOB
3 --N.And carrying out growth and breeding because NOB effectively can not obtain substrate, metabolic activity is suppressed gradually, and growth velocity significantly reduces, and is finally eluriated out system.
In addition, the aerobic respiration enzymic synthesis hysteresis quality of NOB is also cause NO under shorter aerobic hydraulic detention time
2 -another major cause of-N accumulation.After NOB has entered oxygen condition from anoxic or anaerobic state, oxygen will toxicly act on NOB cell, can suppress the growth of NOB cell.This may be delayed relevant with the synthesis of NOB body hydrogen peroxide enzyme, peroxidase and superoxide-dismutase.In respiratory, oxygen is converted to the of short duration intermediate product such as superoxide, super-oxide and hydroxyl radical free radical.NOB has the ability of synthesize hydrogen peroxide enzyme, peroxidase and superoxide-dismutase, and above-mentioned toxicant can be made to decompose, but after having entered oxygen condition from anoxic or anaerobic state, NOB needs certain hour again to synthesize these detoxication enzymes.By shortening aerobic hydraulic detention time, accelerate the circulation of NOB in oxygen-starved area and aerobic zone, hinder NOB to the synthesis of above-mentioned three kinds of enzymes, poisonous oxidation products creates suppression to the growth of NOB and activity.
Beneficial effect of the present invention:
Reduce by bio-denitrifying sewage dephosphorization process the nitrogen be discharged in natural surface water body, phosphorus concentration is the essential measure alleviating body eutrophication.Short-cut denitrification, owing to controlling in nitrosification by nitration reaction, then directly enters the denitrification stage and substantially reduces biochemical reaction process, is a kind of economy, efficient, energy-conservation denitrogenation method.The invention provides a kind of method realizing short-cut denitrification in continuous flow sewage biological carbon and phosphorous removal system.Be 1.0 ~ 2.0mg/L by control continuous-flow system aerobic zone DO concentration, increase system flooding velocity, increase return sludge ratio and mixed liquid recycle ratio to reduce aerobic zone hydraulic detention time, successfully start and maintain short-cut nitrification and denitrification.Regulate and control method is simple, and system nitrite accumulation rate stable maintenance is about 90%, and ammonia nitrogen removal frank is more than 95%, and nitrogen removal rate is more than 75%, and total tp removal rate reaches 96%.Present invention reduces the biochemical reaction time, and the oxygen-supplying amount of about 20% can be saved, carbon source needed for the denitrification of saving about 30%, reduce sludge creation amount, directly reduce sewage disposal expense.
The present invention is directed to the process of municipal effluent denitrogenation dephosphorizing, pre-oxygen-starved area has been set up before traditional anaerobic-anoxic-oxic treatment process, for by from the nitric nitrogen in second pond returned sluge and nitrite nitrogen denitrification, eliminate the disadvantageous effect to anaerobic phosphorus release, ensure biological phosphor-removing effect, make water outlet phosphorus concentration lower than 0.5mg/L.Implementation method due to short-cut denitrification provided by the invention is applicable to the Continuous Flow denitrogenation dephosphorizing process under municipal effluent normal temperature, more meets the actual motion of sewage work, has very strong directive significance to the short-cut denitrification application in Practical Project.
Innovative point of the present invention:
(1) the present invention at normal temperatures, by regulation and control return sludge ratio, mixed liquid recycle ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, short-cut denitrification is achieved in continuous flow sewage biological carbon and phosphorous removal system, regulate and control method is convenient to implement, and provides technical support for omnidistance denitrogenation continuous-flow system realizes short-cut denitrification.
(2) 1/3 of the raw waste water water yield of the present invention enter the denitrification of pre-oxygen-starved area for the nitric nitrogen in second pond returned sluge, the disadvantageous effect of the nitric nitrogen in second pond returned sluge to anaerobic phosphorus release can be eliminated, ensure biological phosphor-removing effect.Other 2/3 water yield enters anaerobic zone and puts phosphorus for anaerobism.The organic carbon source that can make full use of in raw waste water is shunted in water inlet, ensures that the carbon source demand of phosphorus is put in pre-oxygen-starved area denitrification and anaerobic zone.
(3) implementation method of short-cut denitrification provided by the invention is applicable to the Continuous Flow denitrogenation dephosphorizing process under municipal effluent normal temperature, ensures the Nitrogen/Phosphorus Removal of system, can directly apply to the operation of municipal sewage plant while realizing short-cut denitrification.
Accompanying drawing explanation
Fig. 1 continuous-flow system process flow sheet
Fig. 2 nitrite accumulation rate changing conditions
The removal of Fig. 3 ammonia nitrogen and total nitrogen
1-foul water tank, 2-peristaltic pump, 3-water inlet pipe, 4-peristaltic pump, 5-water inlet pipe, the pre-oxygen-starved area of 6-, 7-anaerobic zone, 8-oxygen-starved area, 9-aerobic zone, 10-second pond, 11-sludge reflux pump, 12-mud return line, 13-nitrification liquid reflux pump, 14-nitrification liquid return line, 15-overflow weir, 16-agitator, 17-aeration head, 18-pneumatic pump, 19-under meter, 20-DO determinator, 21-water shoot, 22-excess sludge pipe
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
Continuous flow sewage biological carbon and phosphorous removal system process in the present invention as shown in Figure 1.This device is made up of the pre-oxygen-starved area-anaerobic zone-oxygen-starved area-aerobic zone reactor of Round Sump and second pond, wherein Round Sump reactor useful volume 71L.Pre-oxygen-starved area, anaerobic zone, oxygen-starved area and aerobic zone volume ratio are 1:2:3.5:4.
1/3 water yield in foul water tank 1 is controlled to enter anaerobic zone 7 through water inlet pipe 3 by peristaltic pump 2, completes anaerobism put phosphorus at this; Other 2/3 water yield in foul water tank 1 is controlled to enter pre-oxygen-starved area 6 through water inlet pipe 5 by peristaltic pump 4, meanwhile, precipitating sludge bottom second pond 10 is controlled to enter pre-oxygen-starved area 6 through mud return line 12 by sludge reflux pump 11, the nitric nitrogen carried in this returned sluge and nitrite nitrogen utilize the carbon source in former water to be nitrogen by denitrification, then enter anaerobic zone 7 by overflow weir 15, mix with the raw waste water flowed into.The water outlet of anaerobic zone 7 enters oxygen-starved area 8 through overflow weir 15.The nitrification liquid of aerobic zone 9 is controlled to enter oxygen-starved area 8 through nitrification liquid return line 14 by nitrification liquid reflux pump 13.The denitrification and the anoxic that complete backflow nitrification liquid in oxygen-starved area 8 inhale phosphorus.Oxygen-starved area 8 water outlet enters aerobic zone 9 through overflow weir 15, completes organic matter degradation, nitration reaction and aerobic suction phosphorus in aerobic zone 9.Aerobic zone 9 water outlet enters second pond 10, and the supernatant liquor after precipitation process is discharged by water shoot 21.Excess sludge bottom second pond is discharged by excess sludge pipe 22.Second pond useful volume is 24L.Pre-oxygen-starved area 6, anaerobic zone 7 and oxygen-starved area 8 are all installed agitator 16 and are mixed to provide sufficient muddy water.Aerobic zone 9 is by being fixed on aeration head 17 oxygen supply of reactor bottom, and air is transported to aeration head 17 by pneumatic pump 18 after air flowmeter 19 is measured.The DO concentration of aerobic zone is by DO determinator 20 on-line measurement.
Continuous-flow system runs and is divided into 3 stages, and the aerobic zone hydraulic detention time (aerobic HRT) in each stage calculates by formula (1).
In formula: V
goodfor aerobic zone useful volume; Q is flooding velocity.
Under normal temperature, realize short-cut denitrification by regulation and control return sludge ratio, mixed liquid recycle ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, the control method of 3 operation phase is as follows:
Stage I, controlling return sludge ratio by conditioning of mud reflux pump 11 was 60% as shown in Figure 1; Regulating nitrification liquid reflux pump 13 to control mixed liquid recycle ratio is 200%; Regulate air flowmeter 19 to control to enter the air flow quantity of aerobic zone, make aerobic zone DO concentration be 2mg/L; By regulating peristaltic pump 2 and peristaltic pump 4 to control flooding velocity Q, calculating by formula (1) and making aerobic zone HRT be 3.4h.Treat aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent rises to 60% ~ 70% and enters the stage II.
Stage II to adopt as described in the stage I method to control, and return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 1.5mg/L, aerobic zone hydraulic detention time 3.4h, treats aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent reaches 80% ~ 90% and enters stage III.
Stage III adopts method as described in the stage I to control, and return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 1.0mg/L, aerobic zone hydraulic detention time 3.4h, aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent reaches more than 90%.
Embodiment: the actual domestic wastewater adopting continuous-flow system process biotope septic tank as shown in Figure 1.Its water-quality guideline is: COD concentration 85 ~ 268mg/L, NH
4 +-N concentration 50 ~ 103mg/L, pH value 7.1 ~ 7.4, C/N mean value is 2.5.Seed sludge takes from Beijing municipal sewage plant second pond returned sluge, belongs to omnidistance denitrifying sludge.In reactor, water temperature controls at 25 ± 1 DEG C.In reactor, mixed liquid suspended solids (MLSS) concentration is (3500 ± 500) mg/L.Run according to the control method in above-mentioned 3 stages, run 60d altogether.Flooding velocity is 8.10L/h, and nitrification liquid quantity of reflux and reflux ratio are respectively 16.20L/h and 200%, and sludge reflux amount and reflux ratio are respectively 4.86L/h and 60%, and total hrt (HRT) is 8.74h, anoxic HRT is 2.9h, and aerobic HRT is 3.4h.The DO concentration of stage I-III is controlled as 2.0,1.5 and 1.0mg/L.Fig. 2 illustrates the nitrite accumulation rate changing conditions of run duration, and Fig. 3 illustrates the ammonia nitrogen of run duration and situation removed by total nitrogen.
As shown in Figure 2 and Figure 3, stage I is the nitrite accumulation rising stage.Initial 10d is the adaptive phase of seed sludge.Afterwards in 10-20d, aerobic zone nitrite nitrogen concentration and nitrite accumulation rate rise rapidly, and this latter stage in stage has exceeded 22mg/L and 70% respectively.Although aerobic zone HRT only has 3.4h, oxygen supply abundance (DO2.0mg/L), still can ensure AOB by fully oxidized for ammonia nitrogen for nitrite nitrogen.As shown in Figure 3, stage I latter stage, water outlet ammonia nitrogen is zero, but nitrogen removal rate on average only has 50%.According to the operation of stage I, the object of stage II improves nitrite accumulation rate and nitrogen removal rate further.As shown in Figure 2, the nitrite accumulation rate of stage II is elevated to 82%, and this is that nitrite-oxidizing is that the process lasts of nitrate is suppressed because this stage is still run under shorter aerobic zone HRT.Short-cut nitrification and denitrification is compared with complete nitrification and denitrification, not only shorten in aerobic hydraulic detention time, and oxygen requirement also can reduce by 25%, therefore at stage II, DO is turned down 25%, controls at about 1.5mg/L.Although DO reduces, water outlet ammonia nitrogen is still zero (Fig. 3).As shown in Figure 3, this stage clearance of TN grows steadily, and reaches 70%.This mainly decreases due to the reduction of: aerobic zone DO concentration the amount entering the dissolved oxygen of oxygen-starved area with nitrification liquid backflow, ensure that good anaerobic environment; In addition, the operation of oxygen-starved area short-cut denitrification decreases carbon source demand.DO concentration is reduced to about 1.0mg/L by stage III.As shown in Figure 2, this stage nitrite accumulation rate continues to raise, and reach 94%, aerobic zone nitrate is almost nil, indicates good short distance nitration effect.As shown in Figure 3, this stage water outlet ammonia nitrogen concentration is still close to 0mg/L, and nitrogen removal rate is stabilized in 75%-80%.Water outlet total phosphorus is lower than 0.4mg/L after testing.Successfully short-cut denitrification is achieved in the Continuous Flow denitrification dephosphorization system of process actual domestic wastewater.
Claims (1)
1. a continuous flow sewage biological treatment system realizes the method for short-cut denitrification, it is characterized in that: biological treatment reactor is divided into pre-oxygen-starved area, anaerobic zone, oxygen-starved area and aerobic zone in turn, pre-oxygen-starved area, anaerobic zone, oxygen-starved area and aerobic zone volume ratio are 1:2:3.5:4; Nitrification liquid return line and nitrification liquid reflux pump is connected between aerobic zone and oxygen-starved area; Be connected mud return line and sludge reflux pump bottom second pond with between pre-oxygen-starved area, second pond connects water shoot and excess sludge pipe; Water inlet pipe and water inlet peristaltic pump is connected between foul water tank with anaerobic zone; Water inlet pipe is connected and peristaltic pump of intaking between foul water tank with pre-oxygen-starved area; Water inlet is divided into two portions, and 2/3 of the sewage water yield enters anaerobic zone and puts phosphorus for anaerobism; In addition 1/3 enters pre-oxygen-starved area, for the denitrification of nitric nitrogen in returned sluge and nitrite nitrogen; Under normal temperature, realize short-cut denitrification by regulation and control return sludge ratio, mixed liquid recycle ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, whole process is divided into following 3 stages:
Control that return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 2mg/L, aerobic zone hydraulic detention time 3.4h the stage I, treat aerobic zone NO
2 --N/NO
x --N mass concentration per-cent rises to 60% ~ 70% and enters the stage II;
Control that return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 1.5mg/L, aerobic zone hydraulic detention time 3.4h the stage II, treat aerobic zone NO
2 --N/NO
x --N mass concentration per-cent reaches 80% ~ 90% and enters stage III;
Stage III control return sludge ratio is 60%, mixed liquid recycle ratio is 200%, aerobic zone DO concentration is 1.0mg/L, aerobic zone hydraulic detention time 3.4h, aerobic zone NO
2 --N/NO
x --N mass concentration per-cent reaches more than 90%.
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| CN105481191B (en) * | 2016-01-21 | 2018-08-14 | 山东建筑大学 | A kind of mud decrement and denitrogenation dephosphorizing coupling processing apparatus and method |
| CN105800784B (en) * | 2016-03-28 | 2018-07-06 | 哈尔滨工业大学 | The application process of improvement UCT segmental influent high-efficiency biological nitrogen and phosphorus removal devices based on DEAMOX technologies |
| CN109607781A (en) * | 2018-11-26 | 2019-04-12 | 杭州宸祥环境工程有限公司 | A kind of water body treating devices and methods therefor based on short-cut denitrification reaction |
| CN112125396A (en) * | 2020-09-28 | 2020-12-25 | 北京恩菲环保股份有限公司 | Anaerobic ammonia oxidation enhanced municipal sewage nitrogen and phosphorus removal system and method |
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| CN101353203A (en) * | 2008-09-19 | 2009-01-28 | 清华大学 | Short-cut denitrification synchronous denitrifying phosphorus removal process and apparatus |
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