CN103833134A - 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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- CN103833134A CN103833134A CN201410081091.6A CN201410081091A CN103833134A CN 103833134 A CN103833134 A CN 103833134A CN 201410081091 A CN201410081091 A CN 201410081091A CN 103833134 A CN103833134 A CN 103833134A
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- 238000000034 method Methods 0.000 title claims abstract description 34
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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 continuous flow sewage biological treatment system and realize the method for short-cut denitrification, belong to biological sewage treatment field.
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 the destruction of compound fertilizer excessive emissions to 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 " that China formulates (GB18918-2002) proposed more strict requirement to the discharge index of nitrogen, phosphorus, 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, the research and development of sewage denitrification and dephosphorization new theory, new technology tally with the national condition, and are again study hotspot and the international forward positions of sewage treatment area.
In recent years, a series of sewage denitrification and dephosphorization new theories have been produced, as short distance nitration-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 2 reaction process of nitrification and denitrification.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 Oxidizing Bacteria, NOB)
2 --N is oxidized to NO
3 -the nitrite nitrogen oxidising process of-N.Finally pass through the denitrification of denitrifying bacterium by the NO producing
3 --N is converted into N
2.Wherein NO
2 --N is the intermediate product of 2 processes of nitrification and denitrification.If by NH
4 +-N oxidation control is 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, has shortened the reaction times, and can save the oxygen-supplying amount of 25% left and right, saves the required carbon source of denitrification of 40% left and right, reduces sludge creation amount, directly reduces sewage disposal expense.
The key that realizes short-cut denitrification is to suppress activity or the growth velocity of NOB, cause quantity or the activity of AOB to preponderate in nitrification, make the ammonia oxidation speed in Sludge System be greater than intrasystem nitrite nitrogen rate of oxidation, thereby cause the accumulation of nitrite.Free ammonia FA(Free Ammonia is found in research), 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 has realized short-cut denitrification in a kind of continuous flow sewage biological carbon and phosphorous removal system, is different from technically prior art, 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.Short-cut denitrification is mainly realized in step technique at present, and this is because batch process regulate and control operation is more flexible, especially simple to the control in reaction times, is convenient to take regulation measure adjust operation state.The continuous flow process extensively adopting for large-scale city sewage work is difficult to realize short-cut denitrification, is mainly that variable controlled variable is few because continuous flow process regulate and control operation is more complicated, and control measures and measure are different from batch process completely.The present invention mainly studies the method that realizes 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.It is also to realize the main path of short distance nitration that the selection of free ammonia FA suppresses approach.Therefore, limited research report mainly concentrates on the processing of the percolate of anaerobic sludge digestion liquid that water temperature is higher and high ammonia-nitrogen content.And for actual cities sewage, water temperature does not reach the ideal temperature of realizing short-cut denitrification, the selectivity that low ammonia nitrogen concentration also cannot form free ammonia suppresses.Therefore, the extremely difficult short-cut denitrification of realizing of actual cities Sewage treatment systems.The present invention mainly studies the method that realizes short-cut denitrification in the continuous-flow system of processing actual cities sewage.
(3) control measures.The control measures of applying in engineering practice about short-cut denitrification at present mainly contain high temperature, high free ammonia FA inhibition, low aeration rate (or low DO concentration), based on DO, ORP, pH Online Monitoring Control reaction times.The present invention, owing to being the continuous-flow system of processing actual cities sewage, does not possess the condition of water quality that high temperature and high free ammonia FA suppress, and cannot pass through DO, ORP, pH Online Monitoring Control reaction times yet.The control measures that existing continuous-flow system is realized short-cut denitrification have aerobic zone low DO concentration control.But in application, find that low DO operation has also suppressed the activity of AOB, significantly declines ammonia oxidation speed and ammonia nitrogen removal frank; If when DO is brought up to 1.0mg/L, short distance nitration is destroyed rapidly.Above-mentioned phenomenon has illustrated that the continuous flow process of Treating Municipal Sewage realizes short distance nitration and ensure that denitrification effect is more difficult.The operation under the condition of normal DO concentration (1-2mg/L) of continuous flow process in the present invention realizes short-cut denitrification fast, has no relevant report.
(4) target contaminant of processing.All to realize in simple bio-denitrifying sewage system about the research report of short-cut denitrification at present.The invention relates to and in bio-denitrifying sewage dephosphorization system, how to realize short-cut denitrification, because system has phosphorus removal functional concurrently, regulate and control operation is more complicated, is more difficult to realize short-cut denitrification.Often all have the function of denitrogenation dephosphorizing simultaneously just because of actual sewage work, therefore the present invention has stronger directive significance to the short-cut denitrification application in Practical Project.For improving the removal effect of phosphorus, before continuous-flow system of the present invention, set up pre-oxygen-starved area, for by the nitric nitrogen from second pond returned sluge and nitrite nitrogen denitrification, eliminate the disadvantageous effect to anaerobic phosphorus release.Raw waste water 1/3 enters pre-oxygen-starved area, and 2/3 enters anaerobic zone.Water inlet shunting can make full use of the organic carbon source in raw waste water, ensures that pre-oxygen-starved area denitrification and anaerobic zone put the carbon source demand of phosphorus.
Summary of the invention
The object of the present invention is to provide a kind of method of processing the Continuous Flow biological carbon and phosphorous removal system of actual sewage and realizing short-cut denitrification, to starting in the continuous-flow system of actual sewage and maintain short-cut denitrification processing, solve and short-cut denitrification was applied to the technical barrier of encountering in the continuous-flow system of processing actual sewage in the past, expand the range of application of short-cut denitrification.
A kind of continuous flow sewage biological carbon and phosphorous removal system, is made up of Round Sump reactor and second pond, and 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 communicate by overflow weir; Between aerobic zone and oxygen-starved area, connect nitrification liquid return line and nitrification liquid reflux pump; Bottom second pond with between pre-oxygen-starved area, be connected mud return line and sludge reflux pump, second pond connects water shoot and excess sludge pipe; Between foul water tank and anaerobic zone, be connected water inlet pipe and water inlet peristaltic pump; Between foul water tank and pre-oxygen-starved area, be connected water inlet pipe and water inlet peristaltic pump; Agitator is installed in pre-oxygen-starved area, anaerobic zone and oxygen-starved area; In aerobic zone, be provided with DO determinator, aeration head is installed in bottom; Between pneumatic pump and aeration head, connect air flowmeter.
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, nitrification liquid reflux ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, whole process is divided into following 3 stages:
Stage I control return sludge ratio is 60%, nitrification liquid reflux ratio is 200%, aerobic zone DO concentration is 2mg/L, aerobic zone hydraulic detention time 3.4h, treats aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent rises to 60%～70% and enters stage II.
Stage II control return sludge ratio is 60%, nitrification liquid reflux 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 Phase I.
Phase I controls that return sludge ratio is 60%, nitrification liquid reflux 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%.
In the present invention, processing the principle of work starting in the Continuous Flow denitrification dephosphorization system of actual sewage and maintain short-cut denitrification be:
(1) aerobic hydraulic detention time.There are some researches show, even stable short distance nitration system, excessive aeration also can cause the progressive failure of short distance nitration effect.This shows strictly to control aeration time is to realize the very important factor of short distance nitration.The unloading phase of native system short distance nitration, reducing aerobic HRT can anti-locking system overexposure gas, effectively limits growth, the elutriation of accelerating system to NOB and the enrichment of AOB of NOB.By increasing flooding velocity, although the ammonia nitrogen removal frank of system reduces, improve the ammonia nitrogen loading of system, be conducive to the dominant growth of AOB.
(2) nitrification liquid reflux ratio and return sludge ratio.Control separately aerobic HRT and system SRT and can not in native system, start short-cut denitrification.The key that the present invention realizes short-cut denitrification by controlling the actual hydraulic detention time of larger nitrification liquid reflux ratio (200%) and return sludge ratio (60%) shortening aerobic zone.Larger nitrification liquid reflux ratio and return sludge ratio have been accelerated mud mixture replacing in aerobic and oxygen-starved area.The NO generating in aerobic zone
2 --N can be removed by denitrification timely in oxygen-starved area; Prevent in long aerobic actual hydraulic detention time situation NO
2 --N is further oxidized to NO in aerobic zone by NOB
3 --N.And carry out growth and breeding because NOB can not effectively obtain substrate, and 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 to cause NO under shorter aerobic hydraulic detention time
2 -another major cause of-N accumulation.When 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 relevant with the synthetic hysteresis of NOB body hydrogen peroxide enzyme, peroxidase and superoxide-dismutase.In respiratory, oxygen is converted to the of short duration intermediate products such as superoxide, super-oxide and hydroxyl radical free radical.NOB has the ability of synthesize hydrogen peroxide enzyme, peroxidase and superoxide-dismutase, can make above-mentioned toxicant decompose, but enter oxygen condition from anoxic or anaerobic state, and 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, obstruction NOB is synthetic to above-mentioned three kinds of enzymes, and growth and the activity of poisonous oxidation products to NOB produced inhibition.
Beneficial effect of the present invention:
Reducing by bio-denitrifying sewage dephosphorization processing the nitrogen, the phosphorus concentration that are discharged in natural surface water body is the essential measure that alleviates body eutrophication.Short-cut denitrification, due to nitration reaction is controlled to nitrosification, then directly enters the denitrification stage and has greatly shortened biochemical reaction process, is a kind of economy, efficient, energy-conservation denitrogenation method.The invention provides a kind of method that realizes short-cut denitrification in continuous flow sewage biological carbon and phosphorous removal system.Be 1.0～2.0mg/L by controlling continuous-flow system aerobic zone DO concentration, increase system flooding velocity, increase return sludge ratio and nitrification liquid reflux ratio to reduce aerobic zone hydraulic detention time, successfully start and maintained short-cut nitrification and denitrification.Regulate and control method is simple, and system nitrite accumulation rate stable maintenance is in 90% left and right, and ammonia nitrogen removal frank is more than 95%, and nitrogen removal rate is more than 75%, and total tp removal rate reaches 96%.The present invention has shortened the biochemical reaction time, and can save the oxygen-supplying amount of 20% left and right, saves the required carbon source of denitrification of 30% left and right, reduces sludge creation amount, directly reduces sewage disposal expense.
The present invention is directed to the processing of municipal effluent denitrogenation dephosphorizing, before traditional anaerobic-anoxic-oxic treatment process, set up pre-oxygen-starved area, be used for the nitric nitrogen from 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.Because the implementation method of short-cut denitrification provided by the invention is applicable to the Continuous Flow denitrogenation dephosphorizing processing under municipal effluent normal temperature, more meet the actual motion of sewage work, the short-cut denitrification application in Practical Project is had to very strong directive significance.
Innovative point of the present invention:
(1) the present invention at normal temperatures, by regulation and control return sludge ratio, nitrification liquid reflux ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, in continuous flow sewage biological carbon and phosphorous removal system, realize short-cut denitrification, regulate and control method is convenient to implement, and realizes short-cut denitrification technical support is provided for omnidistance denitrogenation continuous-flow system.
(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 of second pond returned sluge, can eliminate nitric nitrogen in the second pond returned sluge disadvantageous effect to anaerobic phosphorus release, ensure biological phosphor-removing effect.Other 2/3 water yield enters anaerobic zone and puts phosphorus for anaerobism.Water inlet shunting can make full use of the organic carbon source in raw waste water, ensures that pre-oxygen-starved area denitrification and anaerobic zone put the carbon source demand of phosphorus.
(3) implementation method of short-cut denitrification provided by the invention is applicable to the Continuous Flow denitrogenation dephosphorizing processing under municipal effluent normal temperature, ensures the Nitrogen/Phosphorus Removal of system in realizing short-cut denitrification, can directly apply to the operation of municipal sewage plant.
Brief description of the drawings
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 pre-oxygen-starved area-anaerobic zone-oxygen-starved area-aerobic zone reactor and the second pond of Round Sump, 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 through water inlet pipe 3 and is entered anaerobic zone 7 by peristaltic pump 2, completes anaerobism put phosphorus at this; Other 2/3 water yield in foul water tank 1 is controlled through water inlet pipe 5 and is entered pre-oxygen-starved area 6 by peristaltic pump 4, meanwhile, the precipitating sludge of second pond 10 bottoms is controlled through mud return line 12 and is entered pre-oxygen-starved area 6 by sludge reflux pump 11, it is nitrogen by denitrification that the nitric nitrogen carrying in this returned sluge and nitrite nitrogen utilize the carbon source in former water, then enter anaerobic zone 7 by overflow weir 15, mixed with the raw waste water flowing 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 through nitrification liquid return line 14 and is entered oxygen-starved area 8 by nitrification liquid reflux pump 13.The denitrification and the anoxic that complete backflow nitrification liquid in oxygen-starved area 8 are inhaled phosphorus.Oxygen-starved area 8 water outlets enter aerobic zone 9 through overflow weir 15, complete organic matter degradation, nitration reaction and aerobic suction phosphorus in aerobic zone 9.Aerobic zone 9 water outlets enter second pond 10, and the supernatant liquor after precipitation process is discharged by water shoot 21.The excess sludge of second pond bottom is discharged by excess sludge pipe 22.Second pond useful volume is 24L.Agitator 16 is all installed to provide sufficient muddy water to mix in pre-oxygen-starved area 6, anaerobic zone 7 and oxygen-starved area 8.Aerobic zone 9 is by being fixed on aeration head 17 oxygen supplys of reactor bottom, and air is transported to aeration head 17 after air flowmeter 19 is measured by pneumatic pump 18.The DO concentration of aerobic zone is by 20 on-line measurements of DO determinator.
Continuous-flow system operation is divided into 3 stages, and the aerobic zone hydraulic detention time (aerobic HRT) in each stage is pressed formula (1) and calculated.
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, nitrification liquid reflux ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, the control method of 3 operation phase is as follows:
As shown in Figure 1, control return sludge ratio by conditioning of mud reflux pump 11 is 60% to stage I; Regulating nitrification liquid reflux pump 13 to control nitrification liquid reflux ratio is 200%; Regulate air flowmeter 19 to control the air flow quantity that enters aerobic zone, making aerobic zone DO concentration is 2mg/L; By regulating peristaltic pump 2 and peristaltic pump 4 to control flooding velocity Q, making aerobic zone HRT by formula (1) calculating is 3.4h.Treat aerobic zone water outlet NO
2 --N/NO
x --N mass concentration per-cent rises to 60%～70% and enters stage II.
Stage II adopts that method control return sludge ratio as described in stage I is 60%, nitrification liquid reflux 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 Phase I.
Phase I adopts that method control return sludge ratio as described in stage I is 60%, nitrification liquid reflux 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: employing continuous-flow system is as shown in Figure 1 processed the real life sewage of certain biotope septic tank.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 is taken from Beijing municipal sewage plant second pond returned sluge, belongs to omnidistance denitrifying sludge.In reactor, water temperature is controlled at 25 ± 1 DEG C.In reactor, mixed liquid suspended solids (MLSS) concentration is (3500 ± 500) mg/L.According to the control method operation in above-mentioned 3 stages, move altogether 60d.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, and anoxic HRT is 2.9h, and aerobic HRT is 3.4h.It is 2.0,1.5 and 1.0mg/L that the DO concentration of Phase I-III is controlled respectively.Fig. 2 has shown the nitrite accumulation rate changing conditions of run duration, and Fig. 3 has shown ammonia nitrogen and the total nitrogen of run duration and removed situation.
As shown in Figure 2 and Figure 3, Phase I is the nitrite accumulation rising stage.The adaptive phase that initial 10d is seed sludge.In 10-20d, aerobic zone nitrite nitrogen concentration and nitrite accumulation rate rise rapidly afterwards, have exceeded respectively 22mg/L and 70% this latter stage in stage.Although aerobic zone HRT only has 3.4h, oxygen supply abundance (DO2.0mg/L), still can ensure that ammonia nitrogen is fully oxidized to nitrite nitrogen by AOB.As shown in Figure 3, Phase I latter stage, water outlet ammonia nitrogen is zero, but nitrogen removal rate on average only has 50%.According to the operation of Phase I, the object of Phase is further to improve nitrite accumulation rate and nitrogen removal rate.As shown in Figure 2, the nitrite accumulation rate of Phase is elevated to 82%, and this is that the process that nitrite-oxidizing is nitrate continues suppressed because this stage is still moved under shorter aerobic zone HRT.Short-cut nitrification and denitrification is compared with complete nitrification and denitrification, not only aspect aerobic hydraulic detention time, shorten, and oxygen requirement also can reduce by 25%, therefore in Phase, DO is turned down to 25%, is controlled at 1.5mg/L left and right.Although DO has reduced, water outlet ammonia nitrogen is still zero (Fig. 3).As shown in Figure 3, this stage clearance of TN grows steadily, and has reached 70%.This is mainly because: the reduction of aerobic zone DO concentration has reduced with the reflux amount of the dissolved oxygen that enters oxygen-starved area of nitrification liquid, has ensured good anaerobic environment; In addition, the operation of oxygen-starved area short-cut denitrification has reduced carbon source demand.DO concentration is reduced to 1.0mg/L left and right by Phase I.As shown in Figure 2, this stage nitrite accumulation rate continues to raise, and has reached 94%, and aerobic zone nitrate is almost nil, has indicated 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.In the Continuous Flow denitrification dephosphorization system of processing real life sewage, successfully realize short-cut denitrification.
Claims (1)
1. continuous flow sewage biological treatment system is realized a 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, and each subregion volume ratio is 1:2:3.5:4; Between aerobic zone and oxygen-starved area, connect nitrification liquid return line and nitrification liquid reflux pump; Bottom second pond with between pre-oxygen-starved area, be connected mud return line and sludge reflux pump, second pond connects water shoot and excess sludge pipe; Between foul water tank and anaerobic zone, be connected water inlet pipe and water inlet peristaltic pump; Between foul water tank and pre-oxygen-starved area, be connected water inlet pipe and water inlet peristaltic pump; 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 enter pre-oxygen-starved area, for the denitrification of returned sluge nitric nitrogen and nitrite nitrogen; Under normal temperature, realize short-cut denitrification by regulation and control return sludge ratio, nitrification liquid reflux ratio, aerobic zone DO concentration and aerobic zone hydraulic detention time, whole process is divided into following 3 stages:
Stage I control return sludge ratio is 60%, nitrification liquid reflux ratio is 200%, aerobic zone DO concentration is 2mg/L, aerobic zone hydraulic detention time 3.4h, treats aerobic zone NO
2 --N/NO
x --N mass concentration per-cent rises to 60%～70% and enters stage II;
Stage II control return sludge ratio is 60%, nitrification liquid reflux ratio is 200%, aerobic zone DO concentration is 1.5mg/L, aerobic zone hydraulic detention time 3.4h, treats aerobic zone NO
2 --N/NO
x --N mass concentration per-cent reaches 80%～90% and enters Phase I;
Phase I controls that return sludge ratio is 60%, nitrification liquid reflux 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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| 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 |
| CN111960541A (en) * | 2020-10-20 | 2020-11-20 | 清之源环保科技有限公司 | Integrated sewage treatment equipment and method |
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