CN213738774U - High-efficiency denitrification sewage treatment system based on carbon source supplement - Google Patents
High-efficiency denitrification sewage treatment system based on carbon source supplement Download PDFInfo
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- CN213738774U CN213738774U CN202021982921.XU CN202021982921U CN213738774U CN 213738774 U CN213738774 U CN 213738774U CN 202021982921 U CN202021982921 U CN 202021982921U CN 213738774 U CN213738774 U CN 213738774U
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Abstract
The utility model provides a high-efficient denitrogenation sewage treatment system based on carbon source replenisher belongs to sewage treatment technical field. The high-efficiency denitrification sewage treatment system based on the carbon source supplement comprises a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially connected through a one-way valve communicating pipe; the top of the anaerobic tank is provided with a nitrogen inlet pipeline and an exhaust pipeline; air inlet pipelines are arranged at the tops of the anoxic tank and the aerobic tank; the top of the anoxic tank is also provided with an exhaust pipeline; and the water outlet end of the raw water tank is communicated with the water inlet end of the anaerobic tank through a pipeline. The utility model discloses a high-efficient denitrogenation sewage treatment system based on carbon source replenisher through adding different replenishers in the former water tank, then loops through anaerobism pond, oxygen deficiency pond and good oxygen pond to set up nitrogen gas in the anaerobism pond and let in pipeline and blast pipe, set up the air admission pipeline in oxygen deficiency pond and good oxygen pond, thereby realize quick anaerobic reaction and denitrogenation's purpose, and the denitrogenation effect is showing, at sewage treatment technical field, has popularization and application and worth.
Description
Technical Field
The utility model relates to a sewage treatment system technical field, concretely relates to high-efficient denitrogenation sewage treatment system based on carbon source replenisher.
Background
With the rapid development of economy, the problems of water environment pollution and water eutrophication become more serious day by day, and the discharge standards of nitrogen and phosphorus in sewage are continuously improved in various countries. Therefore, research and development of efficient and economical sewage dephosphorization and denitrification processes become research focuses and hot spots in the current sewage control field.
Biological treatment of sewage is a main treatment method of urban sewage, and biochemical treatment can be divided into a biofilm method and an activated sludge method according to the existence state of microorganisms in a treatment structure. Wherein, the fixed biofilm process applied to the urban sewage treatment plant mainly comprises a BAF biological filter, biological contact oxidation, a biological rotating disc and a biological fluidized bed. The activated sludge process is the most widely used sewage treatment technology, has the advantages of good treatment effect, stable effluent quality, rich running experience, low cost and the like in the aspect of treating organic wastewater, and is widely adopted in domestic and foreign municipal sewage treatment plants.
In recent years, with the development of sewage treatment technology, the form of an activated sludge process has been developed into various improvements from the past traditional form, but all biological phosphorus and nitrogen removal processes comprise an alternating cycle of three different processes of anaerobic process, anoxic process and aerobic process. The more widely and mature modes include traditional activated sludge process, A/O process and A/A/O process (including Bardenpho, common A2O and modified A)2O, UCT, MUCT, VIP, inverted A2O Process, multipoint Water in and out inversion A2O process, etc.), AB method, oxidation ditch method, SBR method, membrane bioreactor technology (MBR), etc. However, the existing A is based on the difference of the water inflow and the water quality of the sewage in different seasons2In the O reaction tank, the anaerobic condition cannot be achieved due to the high dissolved oxygen of the anaerobic tank, the anoxic condition cannot be achieved due to the problem of the dissolved oxygen in the anoxic tank, and meanwhile, the anoxic tank is aerobic and has insufficient oxygen content, so that the denitrification cannot achieve a satisfactory result.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a high-efficient denitrogenation sewage treatment system based on carbon source replenisher.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a high-efficiency denitrification sewage treatment system based on a carbon source supplement comprises a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially connected through a one-way valve communicating pipe;
stirring devices are arranged in the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank; what is needed is
A nitrogen inlet pipeline and an exhaust pipeline are arranged at the top of the anaerobic tank;
air inlet pipelines are arranged at the tops of the anoxic tank and the aerobic tank;
the top of the anoxic tank is also provided with an exhaust pipeline;
the top of the aerobic tank is provided with a WTW tester;
the water inlet end of the inner reflux pipeline is arranged on the side wall close to the bottom of the aerobic tank and communicated with the aerobic tank, and the water outlet end of the inner reflux pipeline is arranged at the bottom of the anoxic tank and communicated with the anoxic tank;
the sludge return pipeline is arranged at the bottom of the secondary sedimentation tank, communicated with the secondary sedimentation tank, and provided with an outlet end close to the side wall of the bottom of the pre-anoxic tank, and communicated with the pre-anoxic tank;
the anaerobic tank is characterized by further comprising a raw water tank, and the water outlet end of the raw water tank is communicated with the water inlet end of the anaerobic tank through a pipeline.
Wherein, in the former water tank, need add novel carbon source supplement or novel compound carbon source supplement through feeding device to provide abundant condition for follow-up high-efficient denitrogenation handles.
The novel carbon source replenisher comprises: after the liquor wastewater stock solution is subjected to suction filtration or centrifugation, the liquor wastewater stock solution is filtered by a nanofiltration membrane, and a clear solution 1 and a concentrated solution 1 are respectively obtained under the conditions of cross flow and tangential flow on the surface of the membrane; filtering the clear solution 1 by a reverse osmosis membrane, and respectively obtaining a clear solution 2 and a concentrated solution 2 under the cross flow and the tangential flow on the surface of the membrane; and (3) distilling and separating the concentrated solution 1 or the concentrated solution 2 through a rectifying tower to obtain tower bottom liquid, namely the novel carbon source supplement. The COD of the novel carbon source supplement is more than 30 ten thousand.
The novel composite carbon source supplement consists of the following components: 30-40% of polyhydric alcohol, 5-15% of polysaccharide, 10-40% of fatty acid, 10-30% of brewing yellow water and the balance of water; the novel composite carbon source supplement has the pH value of 5-10, the COD value of more than 30 ten thousand mg/L and good solubility.
Preferably, the anaerobic tank is communicated with the raw water tank, and peristaltic pumps are arranged on the inner return pipeline and the sludge return pipeline.
Preferably, the water inlet end of the anaerobic tank is arranged at the bottom of the anaerobic tank.
Preferably, the gas outlet end of the nitrogen inlet pipeline is close to the bottom of the anaerobic tank.
Preferably, a flow regulator is arranged at the air inlet of the air inlet pipeline and used for regulating the flow of air so as to control the content of oxygen in the anoxic tank and the aerobic tank.
Preferably, the air inlet end of the flow regulator is further connected with an air pump.
Preferably, an air outlet end of the air inlet pipeline in the aerobic tank is also provided with an aeration head.
Preferably, a water outlet is formed in the side wall, close to the top, of the secondary sedimentation tank.
Preferably, the bottom of the secondary sedimentation tank is also communicated with a sludge discharge pipeline.
Preferably, the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank and the secondary sedimentation tank are all made of organic glass so as to facilitate observation.
The utility model has the advantages that:
the utility model discloses a high-efficient denitrogenation sewage treatment system based on carbon source replenisher, through adding different replenishers in the former water tank, then loop through the anaerobism pond, oxygen deficiency pond and good oxygen pond, and set up nitrogen gas in the anaerobism pond and let in pipeline and blast pipe, set up the air admission pipeline in the oxygen deficiency pond and good oxygen pond, thereby realize quick anaerobic reaction and denitrogenation's purpose, make sewage treatment discharge after reaching standard completely, thereby secondary pollution has been avoided, and the denitrogenation effect is showing, in sewage treatment technical field, the value of popularization and application has. Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a high-efficiency denitrification sewage treatment system based on a carbon source supplement of the present invention;
in the figure: 1. a raw water tank; 2. a peristaltic pump; 3. a WTW tester; 4. a stirring device; 5. a pre-anoxic tank; 6. an anaerobic tank; 7. an anoxic tank; 8. an aerobic tank; 9. a secondary sedimentation tank; 10. a water outlet; 11. an air pump; 12. a flow regulator; 13: an aeration head; 14: an internal return line; 15: a sludge return line; 16: a sludge discharge pipe; 17: an exhaust pipe; 18: nitrogen gas enters the pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, a high-efficiency denitrification sewage treatment system based on a carbon source supplement comprises a pre-anoxic tank 5, an anaerobic tank 6, an anoxic tank 7, an aerobic tank 8 and a secondary sedimentation tank 9 which are sequentially connected by a one-way valve communicating pipe; the pre-anoxic tank 5, the anaerobic tank 6, the anoxic tank 7 and the aerobic tank 8 are all provided with stirring devices 4;
the top of the anaerobic tank 6 is provided with a nitrogen inlet pipeline 18 and an exhaust pipeline 17;
air inlet pipelines are arranged at the tops of the anoxic tank 7 and the aerobic tank 8; lack of
The top of the oxygen pool 7 is also provided with an exhaust pipeline 17;
the top of the aerobic tank 8 is provided with a WTW tester 3;
the anaerobic tank also comprises an inner return pipeline 14, wherein the water inlet end of the inner return pipeline 14 is arranged on the side wall close to the bottom of the aerobic tank 8 and communicated with the aerobic tank 8, and the water outlet end of the inner return pipeline 14 is arranged at the bottom of the anaerobic tank 7 and communicated with the anaerobic tank 7;
also comprises a sludge return pipeline 15, the inlet end of the sludge return pipeline 15 is arranged at the bottom of the secondary sedimentation tank and communicated with the secondary sedimentation tank 9, the outlet end of the sludge return pipeline 15 is arranged on the side wall close to the bottom of the pre-anoxic tank 5,
and is communicated with the pre-anoxic tank 5;
the anaerobic tank also comprises a raw water tank 1, and the water outlet end of the raw water tank 1 is communicated with the water inlet end of the anaerobic tank 6 through a pipeline.
Wherein, the one-way valve is communicated with the pipe to avoid the back mixing phenomenon to influence the treatment effect of the treatment tank. The stirring devices 4 are arranged in the pre-anoxic tank 5, the anaerobic tank 6, the anoxic tank 7 and the aerobic tank 8 to provide sufficient mixing so as to improve the reaction efficiency. The effluent of the pre-anoxic tank and the anaerobic tank adopts an overflow form. The secondary sedimentation tank adopts a vertical sedimentation tank.
The water inlet end of the anaerobic tank 6 is arranged at the bottom of the anaerobic tank 6.
The outlet end of the nitrogen inlet pipe 18 is close to the bottom of the anaerobic tank 6.
The air inlet of the air inlet pipeline is provided with a flow regulator 12 for regulating the flow of air so as to control the oxygen content in the anoxic tank 7 and the aerobic tank 8.
The air inlet end of the flow regulator 12 is also connected with an air pump 11.
An aeration head 13 is also arranged at the air outlet end of the air inlet pipeline in the aerobic tank 8. II
A water outlet 10 is arranged on the side wall of the sedimentation tank 9 close to the top.
The bottom of the secondary sedimentation tank 9 is also communicated with a sludge discharge pipe 16.
The pre-anoxic tank 5, the anaerobic tank 6, the anoxic tank 7, the aerobic tank 8 and the secondary sedimentation tank 9 are made of organic glass so as to facilitate observation.
The utility model relates to a high-efficient denitrogenation sewage treatment system based on carbon source replenisher, in the actual work, the method of carrying out sewage denitrogenation processing does: firstly, sewage conveyed by a sewage pipeline enters a raw water tank, a certain amount of novel carbon source supplement or novel composite carbon source supplement is added into the raw water tank, the sewage is conveyed to an anaerobic tank through a peristaltic pump after being inoculated with sludge, and nitrogen enters the pipeline through the nitrogen to remove oxygen in the mixed sewage so as to rapidly carry out anaerobic reaction, so that phosphorus is released by phosphorus accumulating bacteria and easily degradable organic matters such as low-grade fatty acid are absorbed; then, the mixed sewage in the anaerobic tank flows into an anoxic tank in an overflow mode, air is introduced through an air pump, the amount of the introduced air is controlled through a flow regulator, so that the dissolved oxygen content in the mixed sewage in the anoxic tank is ensured, nitrate brought by internal reflux is converted into nitrogen through biological denitrification by denitrifying bacteria, and the nitrogen is discharged into the atmosphere through an exhaust pipeline, so that the aim of rapid denitrification is fulfilled; the mixed sewage treated in the anoxic tank flows into the aerobic tank in an overflow mode, air is introduced through an air pump, the amount of the introduced air is controlled through a flow regulator, so that the dissolved oxygen content in the mixed sewage in the aerobic tank is ensured, and nitrifying bacteria convert ammonia nitrogen in the inflow and ammonia nitrogen formed by ammoniation of organic nitrogen into nitrate through biological nitrification; and finally, enabling the mixed sewage treated in the aerobic tank to flow into a secondary sedimentation tank for sedimentation in an overflow mode, discharging the mixed sewage through a water outlet, enabling the sludge to flow back into the pre-anoxic tank for cyclic utilization through a sludge return pipeline, and discharging the redundant sludge through a sludge discharge pipe.
The utility model discloses a high-efficient denitrogenation sewage treatment system based on carbon source replenisher, through adding different replenishers in the former water tank, then loop through the anaerobism pond, oxygen deficiency pond and good oxygen pond, and set up nitrogen gas in the anaerobism pond and let in pipeline and blast pipe, set up the air admission pipeline in the oxygen deficiency pond and good oxygen pond, thereby realize quick anaerobic reaction and denitrogenation's purpose, make sewage treatment discharge after reaching standard completely, thereby secondary pollution has been avoided, and the denitrogenation effect is showing, in sewage treatment technical field, the value of popularization and application has.
Taking domestic sewage of a septic tank in a certain living cell as an example, the table 1 shows the range of raw water quality indexes, and the table 2 shows the water quality indexes before and after being treated by the high-efficiency denitrification sewage treatment system at a certain time. The inoculated sludge is taken from the return sludge of a secondary sedimentation tank of a sewage treatment plant in a certain city of Chongqing, belonging to the whole course of nitration sludge.
TABLE 1 untreated wastewater quality
| Index of water quality | Range | Mean value of |
| COD(mg/L) | 400～650 | 500 |
| NH4-N(mg/L) | 29～46 | 37.5 |
| TN(mg/L) | 28～57 | 42 |
| TP(mg/L) | 16～27 | 21 |
| pH value | 7.12～7.46 | 7.29 |
As can be seen from the analysis in Table 1, the domestic sewage is a typical domestic sewage with a low C/N ratio, and the average C/N is only 2.53.
TABLE 2 quality of treated Sewage before and after a certain period of time
From the analysis in table 2, the process of the utility model provides a sewage after the high-efficiency denitrification sewage treatment system processes is to NH4 +-N、NO 3 --N、NO 2N has good removal rate, COD can be reduced from 460 to about 20mg/L, and the maximum NH content4 +the-N removal rate can reach more than 95%. The total nitrogen removal rate is more than 90%.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (10)
1. A high-efficiency denitrification sewage treatment system based on a carbon source supplement is characterized by comprising a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially connected through a one-way valve communicating pipe;
stirring devices are arranged in the pre-anoxic tank, the anaerobic tank, the anoxic tank and the aerobic tank;
the top of the anaerobic tank is provided with a nitrogen inlet pipeline and an exhaust pipeline;
air inlet pipelines are arranged at the tops of the anoxic tank and the aerobic tank;
the top of the anoxic tank is also provided with an exhaust pipeline;
the top end of the aerobic tank is provided with a WTW tester;
the water inlet end of the inner reflux pipeline is arranged on the side wall close to the bottom of the aerobic tank and communicated with the aerobic tank, and the water outlet end of the inner reflux pipeline is arranged at the bottom of the anoxic tank and communicated with the anoxic tank;
the sludge return pipeline is arranged at the bottom of the secondary sedimentation tank, communicated with the secondary sedimentation tank, and provided with an outlet end close to the side wall of the bottom of the pre-anoxic tank, and communicated with the pre-anoxic tank;
the anaerobic tank is characterized by further comprising a raw water tank, and the water outlet end of the raw water tank is communicated with the water inlet end of the anaerobic tank through a pipeline.
2. The high-efficiency denitrification sewage treatment system based on carbon source supplement of claim 1, wherein peristaltic pumps are arranged on the pipeline of the anaerobic tank communicated with the raw water tank, and on the inner return pipeline and the sludge return pipeline.
3. The high-efficiency denitrification sewage treatment system based on carbon source supplement of claim 2, wherein the water inlet end of the anaerobic tank is arranged at the bottom of the anaerobic tank.
4. The high efficiency denitrification sewage treatment system based on carbon source supplement of claim 1 wherein the gas outlet end of the nitrogen inlet pipe is near the bottom of the anaerobic tank.
5. The high efficiency denitrification sewage treatment system based on carbon source supplement of claim 1 wherein the air inlet of the air inlet pipe is provided with a flow regulator for regulating the flow of air to control the oxygen content in the anoxic tank and the aerobic tank.
6. The high efficiency denitrification sewage treatment system based on carbon source supplement of claim 5, wherein the air inlet end of the flow regulator is further connected with an air pump.
7. The high efficiency denitrification sewage treatment system based on carbon source supplement of claim 1, wherein the air inlet end of the air inlet pipeline in the aerobic tank is further provided with an aeration head.
8. The high efficiency denitrification sewage treatment system based on carbon source supplement of claim 1 wherein the secondary sedimentation tank is provided with water outlets on the side wall near the top.
9. The high-efficiency denitrification sewage treatment system based on the carbon source supplement of claim 1, wherein the bottom of the secondary sedimentation tank is communicated with a sludge discharge pipeline.
10. The high efficiency denitrification sewage treatment system based on carbon source supplement of claim 1 wherein the pre-anoxic tank, the anaerobic tank, the anoxic tank, the aerobic tank and the secondary sedimentation tank are made of plexiglass.
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