CN107531530B - Efficient sewage denitrification and dephosphorization process and system - Google Patents
Efficient sewage denitrification and dephosphorization process and system Download PDFInfo
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Abstract
A process and a system for denitrification and dephosphorization of sewage reduce the total nitrogen and the total phosphorus in the sewage to below 1mg/L and 0.2mg/L respectively, and the process comprises the following steps: step a: carrying out front-end treatment on the sewage to be treated to ensure that NH is contained in the sewage3-the concentration of N is less than 0.2mg/L; step b: b, carrying out anoxic denitrification treatment on the sewage obtained in the step a; step c: and c, simultaneously carrying out aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage obtained in the step b. The process and the system firstly carry out front-end treatment on the sewage to ensure that the ammonia nitrogen concentration in the sewage is fully reduced, namely, the complete nitrification is achieved, the subsequent anoxic denitrification treatment is ensured to achieve the complete denitrification, and the nitrate nitrogen concentration is fully reduced; continuously supplementing an external carbon source in the anoxic denitrification process to accelerate the denitrification speed; in the steps of aerobic organic matter degradation and chemical precipitation dephosphorization, redundant carbon sources in the previous step are fully removed, and meanwhile, chemical dephosphorization is carried out, so that the treatment time is shortened.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a high-efficiency sewage denitrification and dephosphorization process and a high-efficiency sewage denitrification and dephosphorization system.
Background
With the increase of population, the amount of domestic sewage is also increased sharply. The general sewage treatment process can not effectively treat sewage under the condition of increasing water volume, and overhigh nitrogen and phosphorus are discharged into a receiving water body, so that eutrophication and pollution of the water body are caused, and a large amount of algae in the water body grow to form water bloom. This phenomenon is frequent in developing countries. Governments and related agencies have also taken various measures to deal with this problem to achieve the goal of controlling and ultimately solving the problem. While advances in treatment processes have improved sewage treatment and have mitigated excessive discharge of nutrient salts into natural bodies of water, governments and research and development agencies continue to seek more efficient and lower investment processes in order to meet increasingly stringent discharge standards. For example, in some parts of China, the emission concentration of total nitrogen has been reduced from 3mg/L to 1mg/L, while the emission standard of total phosphorus has been reduced from 1mg/L to 0.2 mg/L. The high cost of existing wastewater treatment processes to achieve such high emission standards has necessitated the development of more efficient and lower cost wastewater treatment processes to meet the ever-increasing wastewater treatment standards. The present invention provides a solution for this purpose.
Disclosure of Invention
The invention aims to provide a high-efficiency sewage denitrification and dephosphorization process and a high-efficiency sewage denitrification and dephosphorization system aiming at the defects in the prior art.
The object of the invention can be achieved by the following technical measures:
the invention provides a high-efficiency sewage denitrification and dephosphorization process, which is different from the prior art in that the process comprises the following steps:
step a: carrying out front-end treatment on the sewage to be treated to ensure that NH is contained in the sewage3-the concentration of N is less than 0.2mg/L;
step b: b, carrying out anoxic denitrification treatment on the sewage obtained in the step a to enable NO in the sewage to be in a nitrogen-rich state3The concentration of N is less than 0.3mg/L, wherein, an external carbon source and sludge subjected to anaerobic acclimation are continuously supplemented in the whole anoxic denitrification treatment process; and
step c: and c, simultaneously carrying out aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage obtained in the step b so as to enable the concentration of P in the sewage to be less than 0.2 mg/L.
Preferably, the step a specifically comprises: sequentially carrying out anaerobic treatment, anoxic treatment and aerobic treatment on the sewage to be treated.
Preferably, the process further comprises step d: c, precipitating the sewage obtained in the step c and collecting the anaerobic sludge obtained by precipitation.
Preferably, the sludge subjected to anaerobic acclimation in the step b is anaerobic sludge collected in the step d.
Preferably, C element and NO in the carbon source in the anoxic denitrification treatment process of the step b3The molar ratio of N to N is (2.9 to 4.0): 1.
Preferably, the external carbon source is selected from one or more of methanol, ethanol and acetic acid.
The invention provides a high-efficiency sewage denitrification and dephosphorization system, which is different from the prior art in that the system comprises:
a front-end treatment device for carrying out front-end treatment on the sewage to be treated so as to lead NH in the sewage3-the concentration of N is less than 0.2mg/L;
the anoxic tank is connected with the water outlet of the front-end treatment device and is used for carrying out anoxic denitrification treatment on the sewage;
the carbon source adding device is communicated with the anoxic tank and is used for adding an external carbon source into the anoxic tank;
the aerobic tank is connected with the water outlet of the anoxic tank and is used for simultaneously carrying out aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage;
the metal salt adding device is communicated with the aerobic tank and is used for adding metal salt into the aerobic tank;
the sedimentation tank is connected with the water outlet of the aerobic tank and is used for settling the sewage to form a sludge layer with the bottom being an anaerobic environment; and
and the sludge reflux device is connected with the sludge discharge port at the bottom of the settling tank and is used for refluxing the sludge in the anaerobic environment at the bottom of the settling tank into the anoxic tank.
Preferably, the front-end processing apparatus includes: the anaerobic tank, the anoxic tank and the first aerobic tank are connected in sequence.
Preferably, the front-end treatment device further comprises a second aerobic tank, wherein the second aerobic tank is positioned between the first aerobic tank and the anoxic tank, and is respectively connected with the water outlet of the first aerobic tank and the water inlet of the anoxic tank, and is used for carrying out aerobic ammonia oxidation treatment on the sewage.
Preferably, the sludge return device is also connected with the anaerobic tank so as to return sludge in the anaerobic environment at the bottom of the settling tank to the anaerobic tank.
Compared with the prior art, the process for removing nitrogen and phosphorus from sewage sequentially comprises a front-end treatment step, an anoxic denitrification step and an aerobic organic matter degradation and chemical precipitation phosphorus removal step, wherein the sewage is subjected to the front-end treatment to fully reduce the ammonia nitrogen concentration in the sewage, namely, to achieve complete nitrification, so that the subsequent anoxic denitrification treatment is ensured to achieve the complete denitrification and the full reduction of the nitrate nitrogen concentration; in addition, an external carbon source and anaerobic domesticated sludge are continuously supplemented in the anoxic denitrification process, so that the denitrification speed is increased; in the steps of aerobic organic matter degradation and chemical precipitation dephosphorization, redundant carbon sources in the previous step are fully removed, and chemical dephosphorization is carried out at the same time, so that the treatment time is reduced; the process and the system for denitrifying and dephosphorizing the sewage can respectively reduce the total nitrogen and the total phosphorus in the sewage to be below 1mg/L and 0.2 mg/L.
Drawings
FIG. 1 is a flow chart of the process for denitrification and dephosphorization of high-efficiency sewage according to the invention.
FIG. 2 is a schematic structural diagram of a high-efficiency sewage denitrification and dephosphorization system according to the invention.
FIG. 3 is a schematic diagram of the system for denitrification and dephosphorization of wastewater according to the preferred embodiment of the present invention.
FIG. 4 is a schematic diagram of a high efficiency denitrification and dephosphorization system for sewage according to another preferred embodiment of the present invention.
Fig. 5 is a schematic plan view of a system according to an embodiment of the invention.
FIG. 6 is a process flow diagram of an embodiment of the invention.
FIG. 7 is a comparison graph of COD of the influent and effluent of wastewater in the example of the present invention.
FIG. 8 is a comparative graph of sewage inlet and outlet TN in the example of the present invention.
FIG. 9 is a comparison of the influent and effluent TP of wastewater in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The word "exemplary" or "illustrative" as used herein means serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other embodiments. All of the embodiments described below are exemplary embodiments provided to enable persons skilled in the art to make and use the examples of the disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. In other instances, well-known features and methods are described in detail so as not to obscure the invention.
"Ammonia nitrogen", "ammoniacal nitrogen" and "NH" described in the specification3-N "are used interchangeably and are all indicated as" free ammonia (NH)3) "or" ammonium ion (NH)4 +) "nitrogen (N) element in the form of. As used herein, "nitrate nitrogen" and "NO" are defined3-N "are used interchangeably and are all indicated as" nitrate ion (NO)3 -) "N element in the form of. The anoxic tank and the facultative tank can be used interchangeably, and the anoxic tank and the facultative tank can be used interchangeably.
The invention provides a high-efficiency sewage denitrification and dephosphorization process, which belongs to an activated sludge process, adopts microorganisms to treat sewage, reduces the total nitrogen in the sewage to 1mg/L and the total phosphorus to the following 0.2mg/L, and as shown in figure 1, the process comprises the following steps:
step S101: carrying out front-end treatment on the sewage to be treated to ensure that NH is contained in the sewage3The concentration of-N is less than 0.2 mg/L.
Step S102: the sewage obtained in the step S101 is subjected to anoxic denitrification treatment to ensure that NO in the sewage3The concentration of-N is less than 0.3mg/L,wherein, the external carbon source and the sludge subjected to anaerobic acclimation are continuously supplemented in the whole anoxic denitrification treatment process.
Step S103: and (4) simultaneously carrying out aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage obtained in the step (S102) so as to enable the concentration of P in the sewage to be less than 0.2 mg/L.
In step S101, the manner of front-end treatment of the wastewater can adopt various manners or combinations thereof in the prior art, as long as NH in the wastewater is treated3The concentration of-N can be reduced to less than 0.2mg/L, and can be selected by those skilled in the art as desired. For example, in a preferred embodiment of the present invention, one of the treatment processes of the front-end treatment adopts an AAO process or an improvement based on the AAO process, which is also called A2O method, and is an abbreviation (Anaerobic-Anoxic-aerobic method) for the first letter of Anaerobic-Oxic, which is a commonly used sewage treatment process, that is: sequentially carrying out anaerobic treatment, anoxic treatment and aerobic treatment on the sewage to be treated to obtain the sewage subjected to front-end treatment. In the prior art, anaerobic treatment is carried out in an anaerobic reactor or a reaction tank, and generally, raw sewage and phosphorus-containing return sludge discharged from a sedimentation tank synchronously enter the anaerobic reactor, and the anaerobic reactor has the function of releasing phosphorus; the anoxic treatment is carried out in an anoxic reactor or a reaction tank, the primary function is denitrification, nitrate nitrogen is sent from the aerobic reactor through internal circulation, and the amount of circulating mixed liquid is large; the aerobic treatment is carried out in an aerobic reactor or a reaction tank, namely an aeration tank, the reaction unit is multifunctional, COD removal, nitrification, phosphorus absorption and the like are carried out at the reaction unit, and the mixed liquid flows back to the anoxic reactor from the reaction unit. That is, the anaerobic tank carries out anaerobic phosphorus release for biochemical phosphorus removal; denitrifying and denitrifying in an anoxic tank; the aerobic tank is used for organic matter degradation, organic nitrogen and ammonia nitrogen nitration and phosphorus absorption. If NH in the sewage is treated by the AAO process (first treatment process of front-end treatment) as described above3The concentration of N is still greater than 0.2mg/L, and it is necessary to continue the NH removal after the first treatment of the front-end treatment3-N, for example, in another preferred embodiment of the invention, said step S101 is at the first of the front-end processingThe second treatment process is added after the treatment process: and (3) carrying out aerobic ammonia oxidation treatment on the sewage obtained in the first treatment process of the front-end treatment. That is, the aerobic treatment is performed again to ensure NH in the wastewater3The concentration of-N is reduced to less than 0.2 mg/L.
The sludge concentration of the anoxic denitrification treatment in the step S102 is more than the sludge concentration of the front end treatment in the step S101 or the sludge subjected to anaerobic acclimation is continuously supplemented in the aerobic ammonia oxidation treatment process after the front end treatment in the step S101. The sludge concentration in the step S102 is increased by 600-800 mg/L. The sludge replenishment may be performed by returning the sludge obtained in the subsequent anaerobic precipitation step to step S102, for example, step S104 is further included after step S103: precipitating the sewage obtained in the step S103, collecting anaerobic sludge obtained by precipitation, and refluxing the sludge obtained by precipitation to the anoxic denitrification treatment in the step S102 as a supplement of the sludge.
C element and NO in the carbon source during the anoxic denitrification denitrogenation treatment of step S1023The molar ratio of N is (2.9-4.0): 1, and preferably, the molar ratio of N to N is controlled to be (2.9-3.5): 1; more preferably, the molar ratio is controlled to be 3: 1. One skilled in the art will be able to work with carbon sources and NO during the treatment3and-N is monitored in real time, the amount of the added carbon source is determined according to the monitoring result, and the carbon source is supplemented at any time so as to ensure the denitrification speed. In a preferred embodiment, the external carbon source is selected from one or more of methanol, ethanol and acetic acid.
In the step S103, the carbon source is introduced into the sewage after the addition of the carbon source, so that the carbon source which is not completely consumed is removed, and aerobic treatment is performed to sufficiently remove organic matters (organic nitrogen can be further removed in addition to the carbon source), and meanwhile, if necessary, metal ions, such as aluminum ions, ferrous ions or ferric ions, can be added into the aerobic treatment process to reduce the concentration of total phosphorus to 0.2mg/L or below. To further increase the phosphorus removal effect, the metal salt may be added in excess.
Regarding the reaction temperatures in step S102 and step S103, the removal effect of the present invention can be achieved without intentionally controlling the reaction temperature in the above-mentioned treatment process, and generally, the reaction speed is in direct proportion to the temperature, and the reaction time (residence time of wastewater in each treatment stage) is in inverse proportion to the temperature, that is, when the temperature is relatively low, the removal effect can be ensured by appropriately extending the reaction time.
Correspondingly, the invention also provides a high-efficiency sewage denitrification and dephosphorization system, which applies the high-efficiency sewage denitrification and dephosphorization process to carry out sewage treatment. Many aspects of the invention are better understood with reference to the following drawings. The devices in the drawings are not necessarily to scale. Instead, emphasis is placed on clearly illustrating the connection of the various devices in the system of the present invention. Moreover, in the several views of the drawings, like reference numerals designate corresponding parts. Referring to fig. 2, the system for denitrification and dephosphorization of high efficiency sewage comprises: a front-end processing device 10, an anoxic tank 20, an aerobic tank 30, a sedimentation tank 40, a carbon source adding device 50, a metal salt adding device 60 and a sludge refluxing device 70. The front-end treatment device 10, the anoxic tank 20, the aerobic tank 30 and the sedimentation tank 40 are sequentially arranged along the flow direction of the sewage, wherein the front-end treatment device 10 is used for performing front-end treatment on the sewage to be treated so as to enable NH in the sewage3-the concentration of N is less than 0.2mg/L (carrying out the above step S101); the anoxic tank 20 is connected to the water outlet of the front-end treatment device 10, and is used for performing anoxic denitrification treatment on the sewage (the step S102 is performed together with the carbon source adding device 50); the carbon source adding device 50 is communicated with the anoxic tank 20 and is used for adding an external carbon source into the anoxic tank 20; the aerobic tank 30 is connected with the water outlet of the anoxic tank 20, and is used for simultaneously performing aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage (the step S103 is performed together with the metal adding device 60); the metal salt adding device 60 is communicated with the aerobic tank 30 and is used for adding metal salt into the aerobic tank 30; the sedimentation tank 40 is connected with the water outlet of the aerobic tank 30 and is used for settling sewage to form a sludge layer with the bottom being an anaerobic environment; the sludge reflux device 70 is connected with a sludge discharge port at the bottom of the precipitation tank 40 and is used for connecting the precipitation tank with the sludge discharge portThe sludge in the anaerobic environment at the bottom of 40 flows back to the anoxic tank 20.
The concentration of dissolved oxygen in the wastewater discharged from the aerobic tank 30 is generally 0.5 to 1.5 mg/L. Meaning of "dissolved oxygen": molecular oxygen dissolved in water is known as dissolved oxygen and is commonly referred to as DO and is expressed in milligrams of oxygen per liter of water. Naturally, the oxygen content in the air does not vary much, so the water temperature is the main factor, the lower the water temperature, the higher the dissolved oxygen content in the water.
In the sedimentation tank 40, sludge is sedimentated from the bottom of the sedimentation tank, the thickness of a sludge layer in the sedimentation tank 40 reaches more than 0.6 m, preferably 0.6-0.8 m, after the retention time of 2-3 hours, the bottom of the sludge layer is an anaerobic environment, the sludge is acclimated in the anaerobic environment, the number of denitrifying bacteria and the content of denitrifying enzyme are increased, part of return sludge containing the sludge and the denitrifying enzyme cultured under the anaerobic condition enters the anoxic tank, and the sludge can rapidly consume dissolved oxygen in the sewage entering the anoxic tank and provide the denitrifying enzyme for denitrification reaction. For example, the sludge concentration in the anoxic tank 20 is increased by 600 to 800 mg/L.
The system for denitrification and dephosphorization of high-efficiency sewage shown in fig. 3 is a preferred mode of the invention, and the front-end processing device 10 comprises: the anaerobic tank 101, the anoxic tank 102 and the first aerobic tank 103 are connected in sequence and used for carrying out an AAO treatment process, the first aerobic tank 103 and the anoxic tank 102 form internal reflux, and the sludge reflux device 70 is further connected with the anaerobic tank 101 so as to reflux sludge in an anaerobic environment at the bottom of the settling tank 40 into the anaerobic tank 101. In the system shown in fig. 3, the anoxic tank 102 is a first-stage anoxic section, the anoxic tank 20 is a second-stage anoxic section, the first aerobic tank 103 is a first-stage aerobic section, and the aerobic tank 30 is a second-stage aerobic section.
The system for denitrification and dephosphorization of high-efficiency sewage shown in fig. 4 is another preferred mode of the present invention, and on the basis of the system shown in fig. 3, a second aerobic tank 104 is added in the front-end treatment device 10, and the second aerobic tank 104 is positioned between the first aerobic tank 103 and the anoxic tank 20 and is suitable for NH in sewage treated by the above-mentioned AAO process (the anaerobic tank 101, the anoxic tank 102 and the first aerobic tank 103)3Concentration of-NAnd when the concentration of the ammonia is still more than 0.2mg/L, the second aerobic tank 104 is respectively connected with the water outlet of the first aerobic tank 103 and the water inlet of the anoxic tank 20 and is used for carrying out aerobic ammonia oxidation treatment on the sewage. In the system shown in fig. 4, the anoxic tank 102 is a first-stage anoxic section, the anoxic tank 20 is a second-stage anoxic section, the first aerobic tank 103 is a first-stage aerobic section, the second aerobic tank 104 is a second-stage aerobic section, and the aerobic tank 30 is a third-stage aerobic section.
Example (b):
the present embodiment provides a system for denitrification and dephosphorization of sewage with high efficiency and a process for sewage treatment using the system, wherein the system is shown in fig. 5, the process flow is shown in fig. 6, and the system of the present embodiment includes: the anaerobic tank 101, the anoxic tank 102, the first aerobic tank 103, the anoxic tank 20, the aerobic tank 30 and the sedimentation tank 40 are connected in sequence, the first aerobic tank and the anoxic tank form internal reflux, and the sedimentation tank is connected with the anoxic tank. In fig. 5, An (Anaerobic), Ax (Anaerobic), Ox (aerobic), the Anaerobic tank 101 is An Anaerobic stage (An), the Anoxic tank 102 is a first stage Anoxic stage (Ax 1), the first aerobic tank 103 is a first stage aerobic stage (Ox 1), the Anoxic tank 20 is a second stage Anoxic stage (Ax 2), and the aerobic tank 30 is a second stage aerobic stage (Ox 2).
The sewage is treated by the system shown in fig. 5, first, the front-end treatment is performed in the front-end treatment apparatus 10: the sewage is sequentially treated at the front end by the anaerobic tank, the anoxic tank and the first aerobic tank, and NH in the sewage3-the concentration of N falls below 0.2mg/L; then, the sewage discharged from the first aerobic tank enters an anoxic tank for anoxic denitrification treatment so as to ensure that NO in the sewage3The concentration of-N is less than 0.3mg/L, and methanol and NO in the anoxic tank are controlled by continuously supplementing methanol in the whole anoxic denitrification treatment process3The mol ratio of-N is 3:1, and meanwhile, in the whole process, anaerobic sludge in the subsequent sedimentation tank continuously flows back to the anoxic tank 20; then, the sewage flowing out of the anoxic tank enters an aerobic tank for aerobic treatment, and simultaneously, metal ions such as aluminum ions, ferrous ions or ferric ions are continuously added to reduceThe concentration of total phosphorus is below 0.2mg/L; finally, the sewage discharged from the aerobic tank 30 enters a precipitation tank for precipitation, sludge is collected, the thickness of the sludge layer is kept to be more than 0.6 m, and the collected sludge continuously flows back to the anoxic tank.
FIGS. 7 to 9 are comparative graphs of COD, TN and TP of the influent and effluent of sewage, respectively, in the present embodiment, the influent index of sewage is COD less than 400mg/L, Total Nitrogen (TN) less than 50mg/L, and Total Phosphorus (TP) less than 8 mg/L; the effluent indexes of the sewage discharged from the precipitation tank 40 after treatment are that COD is less than 20mg/L, Total Nitrogen (TN) is less than 1mg/L and Total Phosphorus (TP) is less than 0.2 mg/L. From the above results, it can be seen that the total nitrogen and total phosphorus indexes meet the discharge standard after the sewage is treated by the system and the process of the embodiment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A high-efficiency sewage denitrification and dephosphorization process is characterized by comprising the following steps:
step a: carrying out front-end treatment on the sewage to be treated to ensure that NH is contained in the sewage3-the concentration of N is less than 0.2mg/L;
step b: b, carrying out anoxic denitrification treatment on the sewage obtained in the step a to enable NO in the sewage to be in a nitrogen-rich state3The concentration of N is less than 0.3mg/L, wherein, an external carbon source is continuously supplemented in the whole anoxic denitrification treatment process; and
step c: c, simultaneously carrying out aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage obtained in the step b to enable the concentration of P in the sewage to be less than 0.2mg/L;
and (c) continuously supplementing the sludge subjected to anaerobic acclimation in the front-end treatment process of the step a and the anoxic denitrification treatment process of the step b.
2. The process for denitrification and dephosphorization of high efficiency sewage according to claim 1, wherein said step a specifically comprises: sequentially carrying out anaerobic treatment, anoxic treatment and aerobic treatment on the sewage to be treated.
3. The process for denitrification and dephosphorization of high efficiency sewage according to claim 1 or 2, wherein the process further comprises the steps of d: c, precipitating the sewage obtained in the step c and collecting the anaerobic sludge obtained by precipitation.
4. The process for denitrification and dephosphorization of high efficiency sewage according to claim 3, wherein said anaerobically acclimated sludge of step a and step b is anaerobic sludge collected in step d.
5. The process of claim 1, wherein the C element and NO in the carbon source are present in the anoxic denitrification treatment of step b3-molar ratio of N (2.9-4.0): 1.
6. the process of claim 1, wherein the external carbon source is selected from one or more of methanol, ethanol and acetic acid.
7. A system for denitrification and dephosphorization of high-efficiency sewage is characterized by comprising:
a front-end treatment device for carrying out front-end treatment on the sewage to be treated so as to lead NH in the sewage3-the concentration of N is less than 0.2mg/L;
the anoxic tank is connected with the water outlet of the front-end treatment device and is used for carrying out anoxic denitrification treatment on the sewage;
the carbon source adding device is communicated with the anoxic tank and is used for adding an external carbon source into the anoxic tank;
the aerobic tank is connected with the water outlet of the anoxic tank and is used for simultaneously carrying out aerobic organic matter degradation and chemical precipitation dephosphorization treatment on the sewage;
the metal salt adding device is communicated with the aerobic tank and is used for adding metal salt into the aerobic tank;
the sedimentation tank is connected with the water outlet of the aerobic tank and is used for settling the sewage to form a sludge layer with the bottom being an anaerobic environment; and
and the sludge reflux device is connected with a drain outlet at the bottom of the settling tank and is used for refluxing the sludge in the anaerobic environment at the bottom of the settling tank to the front-end treatment device and the anoxic tank.
8. The system for denitrification and dephosphorization of high efficiency sewage according to claim 7, wherein said front end processing means comprises: the anaerobic tank, the anoxic tank and the first aerobic tank are connected in sequence.
9. The system for denitrification and dephosphorization of high efficiency sewage according to claim 7, wherein the front end treatment device further comprises a second aerobic tank, the second aerobic tank is positioned between the first aerobic tank and the anoxic tank and is respectively connected with the water outlet of the first aerobic tank and the water inlet of the anoxic tank for aerobic ammoxidation treatment of sewage.
10. The system for denitrification and dephosphorization of sewage according to claim 8, wherein said sludge recirculation apparatus is further connected to the anaerobic tank for recirculating the sludge in the anaerobic environment at the bottom of the settling tank into the anaerobic tank.
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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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| CN101264998A (en) * | 2008-04-28 | 2008-09-17 | 山东建筑大学 | Low carbon source urban sewage strengthening denitrogenation dephosphorization technique and device |
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| CN101570382B (en) * | 2009-06-10 | 2011-07-13 | 北京工业大学 | Device for improving advanced nitrogen and phosphorus removal by step feed and method |
| CN101857337B (en) * | 2010-04-12 | 2012-06-06 | 中国市政工程华北设计研究总院 | Treatment method for biological nitrogen removal of reinforced sewage |
| CN101973674B (en) * | 2010-10-19 | 2013-01-02 | 天津市环境保护科学研究院 | Hydrocyclone solid-liquid separation type SBR-technique domestic sewage treatment device and application method thereof |
| CN103496818B (en) * | 2013-09-11 | 2015-01-07 | 北京工业大学 | AAO (Anaerobic-Anoxic-Oxic)-biological contact oxidation strengthened denitrification and dephosphorization device and real-time control method of low C/N sewage treatment |
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