CN107531530A - The technique and system of high-efficiency sewage denitrogenation dephosphorization - Google Patents
The technique and system of high-efficiency sewage denitrogenation dephosphorization Download PDFInfo
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Abstract
A kind of technique and system of sewage water denitrification dephosphorization, are reduced to 1mg/L and below 0.2mg/L, the technique includes by the total nitrogen in sewage and total phosphorus：Step a：Treatment sewage is subjected to front-end processing to cause NH in sewage3N concentration is less than 0.2mg/L；Step b：Sewage obtained by step a is subjected to anoxic denitrification denitrogenation processing；Step c：Sewage obtained by step b is carried out to aerobic organic matter degradation and chemical precipitation dephosphorization processing simultaneously.Technique and system carry out front-end processing to sewage first makes ammonia nitrogen in sewage concentration fully reduce, that is, reaches exhaustive nitration, it is ensured that follow-up anoxic denitrification denitrogenation processing reaches complete denitrification, fully reduces nitrate nitrogen concentration；Additional carbon is continuously replenished in anoxic denitrification denitrification process, accelerates denitrifying speed；In aerobic organic matter degradation and chemical precipitation dephosphorization step, carbon source unnecessary in previous step is fully removed, while carries out chemical dephosphorization, reduces processing time.
Description
The present invention relates to technical field of sewage, and in particular to a kind of technique and a kind of system of high-efficiency sewage denitrogenation dephosphorization of high-efficiency sewage denitrogenation dephosphorization.
With the increase of population, sanitary sewage amount also sharply increases.The treatment process of general sewage fails effectively to handle sewage in the case where increasing water, and excessively high nitrogen and phosphorus are discharged into and receive in water body, and so as to cause the eutrophication and pollution of water body, the raised growth for causing Measures of Algae in Water Body forms wawter bloom.This phenomenon occurs repeatedly in developing country.Government and there is shutting mechanism also to take various measures to handle this problem to reach control and the ultimate target for solving the problems, such as this.Although improving wastewater treatment efficiency in the progress for the treatment of process and alleviating the excess emissions nutritive salt to natural water, more effective and Low investment technique is still constantly sought by government and research and development institution, to reach increasingly strict discharge standard.For example, the concentration of emission of total nitrogen is reduced to 1mg/L by 3mg/L in certain places of China, and the discharge standard of total phosphorus is then reduced to 0.2mg/L from 1mg/L.The discharge standard that existing sewage treatment will reach so high will may require that very high cost, therefore, it is necessary to more efficient and inexpensive sewage treatment process be developed, to meet increasing effluent-disposal standard.The present invention provides a solution for this purpose.
Summary of the invention
It is an object of the invention in view of the above drawbacks of the prior art, provide the technique and a kind of system of high-efficiency sewage denitrogenation dephosphorization of a kind of high-efficiency sewage denitrogenation dephosphorization.
The purpose of the present invention can be realized by technical measures below:
First aspect present invention provides a kind of technique of high-efficiency sewage denitrogenation dephosphorization, compared with prior art, the difference is that, which includes the following steps:
Step a: treatment sewage is subjected to front-end processing so that NH in sewage3The concentration of-N is less than 0.2mg/L；
Step b: carrying out anoxic denitrification denitrogenation processing for sewage obtained by step a so that NO in sewage3-N
Concentration be less than 0.3mg/L, wherein be continuously replenished during entire anoxic denitrification denitrogenation processing additional carbon and by anaerobic acclimation sludge；And
Sewage obtained by step b: being carried out aerobic organic matter degradation by step c simultaneously and chemical precipitation dephosphorization is processed so that the concentration of P in sewage is less than 0.2mg/L.
Preferably, the step a specifically: treatment sewage is successively subjected to Anaerobic Treatment, anoxic treatment and Aerobic Process for Treatment.
Preferably, which further includes step d: sewage obtained by step c being precipitated and collects precipitating gained anaerobic sludge.
It preferably, is anaerobic sludge collected by step d by the sludge of anaerobic acclimation in the step b.
Preferably, the C element and NO during the anoxic denitrification denitrogenation processing of the step b in carbon source3The molar ratio of-N is (2.9~4.0): 1.
Preferably, the additional carbon is selected from one of methanol, ethyl alcohol and acetic acid or a variety of.
Second aspect of the present invention provides a kind of system of high-efficiency sewage denitrogenation dephosphorization, compared with prior art, the difference is that, which includes:
Front end processing device, for treatment sewage to be carried out front-end processing so that NH in sewage3The concentration of-N is less than 0.2mg/L；
The anoxic slot being connect with front end processing device water outlet, for carrying out anoxic denitrification denitrogenation processing to sewage；
The carbon source adding set being connected to anoxic slot, for adding additional carbon into the anoxic slot；
The aerobic slot being connect with anoxic slot water outlet, for carrying out aerobic organic matter degradation and chemical precipitation dephosphorization processing simultaneously to sewage；
The metal salt adding set being connected to aerobic slot, for adding metal salt into the aerobic slot；
The precipitation tank being connect with aerobic slot water outlet, for being precipitated the sludge blanket to form bottom as anaerobic environment to sewage；And
The sludge refluxing apparatus being connect with precipitating trench bottom mud discharging mouth, for the sludge reflux of trench bottom anaerobic environment will to be precipitated into anoxic slot.
Preferably, the front end processing device includes: that sequentially connected anaerobic pond, anoxic pond and first are aerobic
Pond.
Preferably, the front end processing device further includes the second aerobic tank, and the second aerobic tank is connect with the first aerobic tank water outlet and anoxic slot water inlet respectively between the first aerobic tank and anoxic slot, for carrying out aerobic ammonia oxidation processing to sewage.
Preferably, the sludge refluxing apparatus is also connect with anaerobic pond, will precipitate the sludge reflux of trench bottom anaerobic environment into anaerobic pond.
The technique of sewage water denitrification dephosphorization of the invention is compared with prior art, it successively include front end processing steps, anoxic denitrification nitrogen removal step, oxygen organic of becoming reconciled degradation and chemical precipitation dephosphorization step, making ammonia nitrogen in sewage concentration sufficiently to sewage progress front-end processing first reduces, reach exhaustive nitration, ensure that subsequent anoxic denitrification denitrogenation processing reaches complete denitrification, sufficiently reduces nitrate nitrogen concentration；Also, additional carbon and the sludge by anaerobic acclimation are continuously replenished in anoxic denitrification denitrification process, accelerates denitrifying speed；In aerobic organic matter degradation and chemical precipitation dephosphorization step, extra carbon source is sufficiently removed in previous step, while carrying out chemical dephosphorization, reduces the processing time；The technique and system of sewage water denitrification dephosphorization of the invention can by sewage total nitrogen and total phosphorus be reduced to 1mg/L and 0.2mg/L or less.
Fig. 1 is the flow chart of the technique of high-efficiency sewage denitrogenation dephosphorization of the invention.
Fig. 2 is the structural schematic diagram of the system of high-efficiency sewage denitrogenation dephosphorization of the invention.
Fig. 3 is the structural schematic diagram of the system of the high-efficiency sewage denitrogenation dephosphorization of preferred embodiment of the invention.
Fig. 4 is the structural schematic diagram of the system of the high-efficiency sewage denitrogenation dephosphorization of another preferred embodiment of the invention.
Fig. 5 is the floor map of the system of the embodiment of the present invention.
Fig. 6 is the process flow chart of the embodiment of the present invention.
Fig. 7 is wastewater influent and water outlet COD comparison diagram in the embodiment of the present invention.
Fig. 8 is wastewater influent and water outlet TN comparison diagram in the embodiment of the present invention.
Fig. 9 is wastewater influent and water outlet TP comparison diagram in the embodiment of the present invention.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawing and tool
Invention is further described in detail for body embodiment.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
Word " exemplary " as used herein or " illustrative " expression are used as example, example or explanation.Any embodiment for being described herein as " exemplary " or " illustrative " is not necessarily to be construed as being preferred or advantageous relative to other embodiment.All embodiments described below are illustrative embodiments, there is provided these illustrative embodiments is in order to enable those skilled in the art make and use embodiment of the disclosure and expection is not intended to limit the scope of the present disclosure, and the scope of the present disclosure is defined by the claims.In other embodiments, well known feature and method is described in detail so as not to obscure the present invention.
" ammonia nitrogen ", " ammoniacal nitrogen " and " NH documented by this specification3- N " is used interchangeably, and is indicated with " free ammonia (NH3) " or " ammonium ion (NH4 +) " nitrogen (N) element existing for form." nitrate nitrogen ", " nitrate nitrogen " and " NO documented by this specification3- N " is used interchangeably, and is indicated with " nitrate ion (NO3 -) " N element existing for form." anoxic slot " in the present invention and " and oxygen slot " is used interchangeably, " anoxic pond " and " oxygen compatibility pool " are used interchangeably.
The present invention provides a kind of techniques of high-efficiency sewage denitrogenation dephosphorization, belong to activated sludge process, carry out sewage treatment using microorganism, the total nitrogen in sewage are reduced to 1mg/L, total phosphorus is reduced to following 0.2mg/L, refering to Figure 1, the technique includes the following steps:
Step S101: treatment sewage is subjected to front-end processing so that NH in sewage3The concentration of-N is less than 0.2mg/L.
Step S102: carrying out anoxic denitrification denitrogenation processing for sewage obtained by step S101 so that NO in sewage3The concentration of-N is less than 0.3mg/L, wherein additional carbon and the sludge by anaerobic acclimation are continuously replenished during entire anoxic denitrification denitrogenation processing.
Sewage obtained by step S102: being carried out aerobic organic matter degradation by step S103 simultaneously and chemical precipitation dephosphorization is processed so that the concentration of P in sewage is less than 0.2mg/L.
In step s101, the mode of sewage front-end processing can be using various modes in the prior art or combinations thereof, as long as by NH in sewage3The concentration of-N decreases below 0.2mg/L, and those skilled in the art, which can according to need, to be selected.For example, in a preferred embodiment of the present invention, one for the treatment of process of front-end processing uses AAO Process or the improvement based on AAO technique, AAO technique
Method is also known as A2O method, it is the abbreviation (anaerobic- anoxic- oxic method) of English Anaerobic-Anoxic-Oxic first letter, it is a kind of common sewage treatment process, that is: treatment sewage is successively subjected to Anaerobic Treatment, anoxic treatment and Aerobic Process for Treatment, the sewage after obtaining front-end processing.In the prior art, Anaerobic Treatment carries out in anaerobic reactor or reaction tank, and generally, raw sewage enters in anaerobic reactor with from the phosphorous returned sludge that sedimentation basin is discharged is synchronous, and the function of anaerobic reactor is release phosphorus；Anoxic treatment carries out in anoxic reacter or reaction tank, and premiere feature is denitrogenation, and nitrate nitrogen is to be sent by interior circulation by aerobic reactor, and the mixing liquid measure of circulation is larger；Aerobic Process for Treatment carries out in aerobic reactor or reaction tank, as aeration tank, this reaction member be it is multi-functional, remove COD, nitrification and absorb phosphorus etc. and carry out here, mixed liquor flows back into anoxic reacter from here.That is, anaerobic pond carries out the anaerobic phosphorus release of biochemical dephosphorization；Anoxic pond carries out denitrification denitrogenation；The absorption of aerobic tank progress organic matter degradation, organic nitrogen and Ammonia Nitrification, phosphorus.If NH in the sewage by above-mentioned AAO process (first treatment process of front-end processing)30.2mg/L is still greater than in the concentration of-N, needs to continue after first treatment process of front-end processing to remove NH3- N, for example, the step S101 is further added by second treatment process after first treatment process of front-end processing in another preferred embodiment of the present invention: sewage obtained by first treatment process of front-end processing is carried out aerobic ammonia oxidation processing.That is, carrying out an Aerobic Process for Treatment again to ensure NH in sewage3The concentration of-N decreases below 0.2mg/L.
The sludge by anaerobic acclimation is continuously replenished during the sludge concentration of progress anoxic denitrification denitrogenation processing is than the aerobic ammonia oxidation processing after front-end processing in the sludge concentration or step S101 of front-end processing in step S101 in step S102.So that the sludge concentration in step S102 improves 600~800mg/L.Sludge supplement can be in such a way that gained sludge reflux in subsequent anaerobic precipitation step be into step S102, such as, after step s 103 further include step S104: being precipitated to sewage obtained by step S103 and collected precipitating gained anaerobic sludge, and the supplement by precipitating gained sludge reflux into the anoxic denitrification denitrogenation processing of step S102 as sludge.
C element and NO during the anoxic denitrification denitrogenation processing of step S102 in carbon source3The molar ratio of-N is (2.9~4.0): 1, it is preferable that the two molar ratio is controlled in (2.9~3.5): 1；It is highly preferred that the control of the two molar ratio is in 3:1.Those skilled in the art are during processing to carbon source and NO3- N carries out real-time monitoring, and the amount of carbon source addition is determined according to monitoring result, is supplemented at any time carbon source, to guarantee denitrification
Speed.In one preferred embodiment, additional carbon is selected from one of methanol, ethyl alcohol and acetic acid or a variety of.
By step S102 handle sewage due to additional carbon addition, carbon source is introduced in sewage again, therefore, in step s 103, by the above-mentioned carbon source removal not run out of, carry out Aerobic Process for Treatment, sufficiently removal organic matter is (other than carbon source, organic nitrogen can also further be removed), meanwhile, if necessary, metal ion, such as aluminium ion, ferrous ion or ferric ion, it can be added in Aerobic, reach 0.2mg/L or following to reduce the concentration of total phosphorus.Phosphorus ligands effect in order to further increase, added metal salt can be excessive.
Reaction temperature about step S102 and step S103, in above-mentioned treatment process, without deliberately controlling reaction temperature, also it can achieve removal effect of the invention, under normal circumstances, reaction speed is proportional with temperature, reaction time (each processing stage dwell time of sewage) and temperature are in inverse ratio, that is, can ensure removal effect by way of the reaction time is appropriately extended when temperature is relatively low.
Correspondingly, the present invention also provides the system of high-efficiency sewage denitrogenation dephosphorization, which carries out sewage treatment using the technique of above-mentioned high-efficiency sewage denitrogenation dephosphorization.Hereinafter, many aspects of the invention will be more fully understood with reference to attached drawing.Device in attached drawing is not necessarily drawn to scale.Alternatively, it is preferred that emphasis is clearly demonstrate the connection of each device in system of the invention.In addition, identical appended drawing reference indicates corresponding device in several views in the accompanying drawings.It please refers to shown in Fig. 2, the system of the high-efficiency sewage denitrogenation dephosphorization includes: front end processing device 10, anoxic slot 20, aerobic slot 30, precipitation tank 40, carbon source adding set 50, metal salt adding set 60 and sludge refluxing apparatus 70.Front end processing device 10, anoxic slot 20, aerobic slot 30 and precipitation tank 40 are set gradually along drainage flow direction, wherein front end processing device 10 is used to treatment sewage carrying out front-end processing so that NH in sewage3The concentration of-N is less than 0.2mg/L (carrying out above-mentioned S101 step)；Anoxic slot 20 is connect with 10 water outlet of front end processing device, for carrying out anoxic denitrification denitrogenation processing (carrying out above-mentioned S102 step jointly with following carbon source adding sets 50) to sewage；Carbon source adding set 50 is connected to anoxic slot 20, for adding additional carbon into the anoxic slot 20；Aerobic slot 30 is connect with 20 water outlet of anoxic slot, for carrying out aerobic organic matter degradation and chemical precipitation dephosphorization processing (carrying out above-mentioned S103 step jointly with following metal adding sets 60) simultaneously to sewage；Metal salt adding set 60 is connected to aerobic slot 30, for adding metal salt into the aerobic slot 30；Precipitation tank 40 and 30 water outlet of aerobic slot connect
It connects, for being precipitated the sludge blanket to form bottom as anaerobic environment to sewage；Sludge refluxing apparatus 70 is connect with 40 bottom mud discharging mouth of precipitation tank, for by the sludge reflux of 40 bottom anaerobic environment of precipitation tank into anoxic slot 20.
The dissolved oxygen concentration for the sewage being discharged from aerobic slot 30 is generally 0.5~1.5mg/L.The meaning of " dissolved oxygen ": the molecular oxygen being dissolved in the water is known as dissolved oxygen, is usually denoted as DO, is indicated with the milligram number of oxygen in every liter of water.In natural conditions, the oxygen content in air changes less, therefore water temperature is main factor, and water temperature is lower, and the content of oxygen in water is higher.
In precipitation tank 40, sludge starts from the bottom deposition, the thickness of sludge blanket reaches 0.6 meter or more in precipitation tank 40, it is preferred that 0.6~0.8 meter, by 2~3 hours residence times, sludge blanket bottom is anaerobic environment, these sludge, which are equivalent to, have passed through anaerobic environment domestication, denitrifying bacterium quantity and denitrification enzyme content increase, returned sludge of the part containing the above-mentioned sludge and denitrification enzyme cultivated under anaerobic condition enters anoxic slot, these sludge can consume rapidly into the dissolved oxygen in the sewage of anoxic slot and provide denitrification enzyme to carry out anti-nitration reaction.For example, the sludge concentration in anoxic slot 20 is made to improve 600~800mg/L.
The system of high-efficiency sewage denitrogenation dephosphorization shown in Fig. 3 is a preferred embodiment of the invention, front end processing device 10 includes: sequentially connected anaerobic pond 101, anoxic pond 102 and the first aerobic tank 103, for carrying out AAO treatment process, first aerobic tank 103 forms interior reflux with anoxic pond 102, sludge refluxing apparatus 70 is also connect with anaerobic pond 101, by the sludge reflux of 40 bottom anaerobic environment of precipitation tank into anaerobic pond 101.In the system as shown in fig. 3, anoxic pond 102 is first stage anoxic section, anoxic slot 20 is second stage anoxic section, and the first aerobic tank 103 is first stage aerobic section, aerobic slot 30 is second stage aerobic section.
The system of high-efficiency sewage denitrogenation dephosphorization shown in Fig. 4 is another preferred embodiment of the invention, on the basis of system shown in Fig. 3, increase by the second aerobic tank 104 in front end processing device 10, second aerobic tank 104 is between the first aerobic tank 103 and anoxic slot 20, the NH suitable for the sewage Jing Guo above-mentioned AAO process (anaerobic pond 101, anoxic pond 102 and the first aerobic tank 103)3The situation of 0.2mg/L is still greater than in the concentration of-N, and the second aerobic tank 104 is connect with 103 water outlet of the first aerobic tank and 20 water inlet of anoxic slot respectively, for carrying out aerobic ammonia oxidation processing to sewage.In system shown in Fig. 4, anoxic pond 102 is first stage anoxic section, anoxic slot 20 is second stage anoxic section, and the first aerobic tank 103 is first stage aerobic section, the second aerobic tank 104 is second stage aerobic section, and aerobic slot 30 is phase III aerobic section.
Embodiment:
The technique that the system and a kind of application system for present embodiments providing a kind of high-efficiency sewage denitrogenation dephosphorization carry out sewage treatment, system please refers to shown in Fig. 5, process flow please refers to shown in Fig. 6, the system of the present embodiment includes: sequentially connected anaerobic pond 101, anoxic pond 102, the first aerobic tank 103, anoxic slot 20, aerobic slot 30 and precipitation tank 40, first aerobic tank and anoxic pond form interior reflux, and precipitation tank is connect with anoxic slot.An (Anaerobic in Fig. 5, anaerobism), Ax (Anoxic, anoxic), Ox (Oxic, aerobic), anaerobic pond 101 are anaerobism section (An), anoxic pond 102 is first stage anoxic section (Ax1), the first aerobic tank 103 is first stage aerobic section (Ox1), anoxic slot 20 is second stage anoxic section (Ax2), aerobic slot 30 be second stage aerobic section (Ox2).
Sewage is handled using system shown in fig. 5, firstly, carrying out front-end processing in front end processing device 10: sewage successively passes through anaerobic pond, anoxic pond and the first aerobic tank and carries out front-end processing, NH in sewage3The concentration of-N is down to 0.2mg/L or less；Then, enter in anoxic slot from the sewage that the first aerobic tank excludes and carry out anoxic denitrification denitrogenation processing so that NO in sewage3The concentration of-N is less than 0.3mg/L, and methanol and NO in methanol control anoxic slot are continuously replenished during entire anoxic denitrification denitrogenation processing3The molar ratio of-N is 3:1, meanwhile, in whole process, the anaerobic sludge in post precipitation slot is constantly back in anoxic slot 20；Then, the sewage flowed out from anoxic slot enters aerobic slot and carries out Aerobic Process for Treatment, meanwhile, continuous addition metal ion, such as aluminium ion, ferrous ion or ferric ion, to reduce the concentration of total phosphorus to 0.2mg/L or less；It is precipitated finally, entering precipitation tank from the sewage that aerobic slot 30 excludes, collects sludge, kept sludge blanket thickness at 0.6 meter or more, the sludge of collection is constantly back in anoxic slot.
Fig. 7 to Fig. 9 is respectively wastewater influent and water outlet COD, TN and TP comparison diagram, and the wastewater influent index in the present embodiment is that COD is less than 400mg/L, and total nitrogen (TN) is less than 50mg/L, and total phosphorus (TP) is less than 8mg/L；The sewage effluent index being discharged after processing from precipitation tank 40 is that COD is less than 20mg/L, and total nitrogen (TN) is less than 1mg/L, and total phosphorus (TP) is less than 0.2mg/L.As can be seen from the above results, after being handled using the system of the present embodiment and technique sewage, total nitrogen and total phosphorus index are all satisfied discharge standard.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in this hair
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within bright spirit and principle.
Claims (10)
- A kind of technique of high-efficiency sewage denitrogenation dephosphorization, which is characterized in that the technique includes the following steps:Step a: treatment sewage is subjected to front-end processing so that NH in sewage3The concentration of-N is less than 0.2mg/L；Step b: carrying out anoxic denitrification denitrogenation processing for sewage obtained by step a so that NO in sewage3The concentration of-N is less than 0.3mg/L, wherein additional carbon and the sludge by anaerobic acclimation are continuously replenished during entire anoxic denitrification denitrogenation processing；AndSewage obtained by step b: being carried out aerobic organic matter degradation by step c simultaneously and chemical precipitation dephosphorization is processed so that the concentration of P in sewage is less than 0.2mg/L.
- The technique of high-efficiency sewage denitrogenation dephosphorization according to claim 1, which is characterized in that the step a specifically: treatment sewage is successively subjected to Anaerobic Treatment, anoxic treatment and Aerobic Process for Treatment.
- The technique of high-efficiency sewage denitrogenation dephosphorization according to claim 1 or 2, which is characterized in that the technique further includes step d: sewage obtained by step c is precipitated and collects precipitating gained anaerobic sludge.
- The technique of high-efficiency sewage denitrogenation dephosphorization according to claim 3, which is characterized in that the sludge for passing through anaerobic acclimation in the step b is anaerobic sludge collected by step d.
- The technique of high-efficiency sewage denitrogenation dephosphorization according to claim 1, which is characterized in that C element and NO during the anoxic denitrification denitrogenation processing of the step b in carbon source3The molar ratio of-N is (2.9~4.0): 1.
- The technique of high-efficiency sewage denitrogenation dephosphorization according to claim 1, which is characterized in that the additional carbon is selected from one of methanol, ethyl alcohol and acetic acid or a variety of.
- A kind of system of high-efficiency sewage denitrogenation dephosphorization, which is characterized in that the system includes:Front end processing device, for treatment sewage to be carried out front-end processing so that NH in sewage3The concentration of-N is less than 0.2mg/L；The anoxic slot being connect with front end processing device water outlet, for carrying out anoxic denitrification denitrogenation processing to sewage；The carbon source adding set being connected to anoxic slot, for adding additional carbon into the anoxic slot；The aerobic slot being connect with anoxic slot water outlet, for carrying out aerobic organic matter degradation and chemical precipitation dephosphorization processing simultaneously to sewage；The metal salt adding set being connected to aerobic slot, for adding metal salt into the aerobic slot；The precipitation tank being connect with aerobic slot water outlet, for being precipitated the sludge blanket to form bottom as anaerobic environment to sewage；AndThe sludge refluxing apparatus being connect with precipitating trench bottom mud discharging mouth, for the sludge reflux of trench bottom anaerobic environment will to be precipitated into anoxic slot.
- The system of high-efficiency sewage denitrogenation dephosphorization according to claim 7, which is characterized in that the front end processing device includes: sequentially connected anaerobic pond, anoxic pond and the first aerobic tank.
- The system of high-efficiency sewage denitrogenation dephosphorization according to claim 7, it is characterized in that, the front end processing device further includes the second aerobic tank, second aerobic tank is between the first aerobic tank and anoxic slot, it is connect respectively with the first aerobic tank water outlet and anoxic slot water inlet, for carrying out aerobic ammonia oxidation processing to sewage.
- The system of high-efficiency sewage denitrogenation dephosphorization according to claim 8, which is characterized in that the sludge refluxing apparatus is also connect with anaerobic pond, will precipitate the sludge reflux of trench bottom anaerobic environment into anaerobic pond.
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| US201562189372P | 2015-07-07 | 2015-07-07 | |
| US62/189,372 | 2015-07-07 | ||
| PCT/CN2016/088371 WO2017005154A1 (en) | 2015-07-07 | 2016-07-04 | High-efficiency wastewater denitrification and dephosphorization process and system |
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