CN110776200A - A high-efficient biological denitrogenation system for sewage treatment - Google Patents
A high-efficient biological denitrogenation system for sewage treatment Download PDFInfo
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- CN110776200A CN110776200A CN201911072247.3A CN201911072247A CN110776200A CN 110776200 A CN110776200 A CN 110776200A CN 201911072247 A CN201911072247 A CN 201911072247A CN 110776200 A CN110776200 A CN 110776200A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a high-efficiency biological denitrification system for sewage treatment, which mainly solves the problems that the biological denitrification treatment in the existing sewage treatment in the prior art has various problems, and the denitrification effect of the sewage treatment is not ideal. The efficient biological denitrification system for sewage treatment comprises a sewage tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a hydrolysis acidification tank, a dephosphorization tank and a circulation tank which are sequentially communicated, wherein a sludge outlet of the circulation tank is communicated with the anoxic tank; the upper part of the circulating pool is provided with a water outlet. Through the scheme, the invention achieves the aims of strengthening the denitrification efficiency of denitrifying bacteria such as denitrifying bacteria and the like in the anoxic tank, realizing the reduction treatment and resource utilization of the excess sludge, and has very high practical value and popularization value.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a high-efficiency biological denitrification system for sewage treatment.
Background
Along with the improvement of the living standard of cities and towns in China, the proportion of nitrogen and phosphorus in the domestic sewage of cities and towns is larger and larger, but easily degradable organic matters which can be used for the biological treatment of the sewage cannot meet the requirement of microorganisms in the sewage treatment, so that the effluent of the traditional biological sewage treatment cannot reach the sewage discharge standard, and the water environment safety of China is threatened.
The traditional sewage biological treatment process comprises a heat treatment technology, but has the problems of high energy consumption, easy equipment fouling, difficult treatment of odor and the like; the mechanical treatment technology cannot effectively inactivate pathogenic bacteria in the excess sludge, and corrosion or blockage of mechanical treatment equipment is easily caused;
the biological treatment technology can generate a large amount of odor in the process of cell lysis, and the extraction process of the related lysozyme and the cell lysis bacteria is complex and has higher cost; the hydrogen peroxide treatment technology has instability, needs to be prepared at present, greatly increases the preparation cost, and increases the operation cost because residual substances of the hydrogen peroxide treatment technology need to be removed by heating treatment;
the operation process and the operation condition of the oxygen treatment technology are difficult to control; ultrasonic treatment techniques are not very targeted, resulting in increased costs and susceptibility to corrosion of the generating equipment.
Therefore, biological denitrification treatment in the existing sewage treatment has various problems, so that the denitrification effect of the sewage treatment is not ideal; more advanced treatment technology is urgently needed to solve the problem of denitrification in the current sewage treatment.
Disclosure of Invention
The invention aims to provide a high-efficiency biological denitrification system for sewage treatment, which aims to solve the problems that the biological denitrification treatment in the existing sewage treatment has various problems, and the denitrification effect of the sewage treatment is not ideal.
In order to solve the above problems, the present invention provides the following technical solutions:
a high-efficiency biological denitrification system for sewage treatment comprises a sewage tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a hydrolysis acidification tank, a dephosphorization tank and a circulation tank which are sequentially communicated, wherein a sludge outlet of the circulation tank is communicated with the anoxic tank; the upper part of the circulating pool is provided with a water outlet.
Specifically, the bottom of the secondary sedimentation tank is sequentially communicated with an ultrasonic treatment tank and a hydrolysis acidification tank; the secondary sedimentation tank is communicated with the hydrolysis acidification tank; at least one sealing shell is respectively arranged on the periphery and the bottom of the inner wall of the ultrasonic treatment pool; an ultrasonic generator is arranged in the sealing shell; the bottom of the ultrasonic treatment pool is provided with a stirrer.
Specifically, the sewage tank is communicated with a water inlet pipe; a water outlet pipe is arranged at the lower part or the bottom of the side wall of the water tank; peristaltic pumps are respectively arranged on the water outlet pipe, the secondary sedimentation tank, the hydrolysis acidification tank, the dephosphorization tank and the pipelines between the adjacent circulation tanks.
Particularly, stirring devices are arranged in the anaerobic tank, the anoxic tank and the aerobic tank to prevent sedimentation; the stirring device comprises a stirring shaft and a stirring rod penetrating through the stirring shaft; one end of the stirring shaft is positioned outside the pool and is connected with a driving motor for driving the stirring shaft to rotate; the side walls of the end parts of the stirring rods positioned at the two sides of the stirring shaft are connected with a plurality of stirring support rods, and all the stirring support rods surround into a horn shape or a round shape in the vertical direction.
In particular, all the stirring struts in the shape of a horn or a circle are connected with at least one cross rod or a curved rod.
Specifically, the high-efficiency biological denitrification system for sewage treatment further comprises an aeration pump; the anoxic tank and the aerobic tank are respectively provided with an aeration head, and the aeration heads in the anoxic tank and the aerobic tank are respectively communicated with an aeration pump.
Specifically, a mixed filler of a polyethylene composite material sphere with a plurality of surfaces and spherical medical stone is filled in the hydrolysis acidification tank; the mixed filler accounts for 30-50% of the volume of the hydrolysis acidification tank.
Specifically, Mg Cl2 forms struvite crystals in the phosphorus removal tank to remove phosphorus from the acidified product.
Compared with the prior art, the invention has the following beneficial effects:
(1) the sewage is treated by an anaerobic tank, an anoxic tank and an aerobic tank in sequence and then enters a secondary sedimentation tank for sedimentation, and the bottom of the secondary sedimentation tank is connected with a pipeline communicated with a hydrolysis acidification tank; the precipitated sludge enters a hydrolysis acidification tank, after hydrolysis, the sludge enters a phosphorus removal tank for phosphorus removal, and hydrolysis acidification products entering a circulation tank are guided to an anoxic tank, so that the denitrification efficiency of denitrifying bacteria such as denitrifying bacteria in the anoxic tank is enhanced, and the reduction treatment and resource utilization of the residual sludge are realized.
(2) In the invention, the ultrasonic generators are arranged on the side wall and the bottom of the sludge, so that the sludge can be fully subjected to ultrasonic action; one half of the sludge in the secondary sedimentation tank directly enters a hydrolysis acidification tank for supplementing the content of microorganisms; the other half of the cell is sent into an ultrasonic wave treatment pool for ultrasonic lysis treatment.
(3) The finally formed horn-shaped or round stirring device can effectively stir the sewage on each layer surface in the vertical direction to ensure that the sewage is mixed more uniformly and can react more effectively.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the drawings, the names of the parts corresponding to the reference numerals are as follows:
1-sewage tank, 2-anaerobic tank, 3-anoxic tank, 4-aerobic tank, 5-secondary sedimentation tank, 6-hydrolytic acidification tank, 7-circulation tank, 8-water discharge port, 9-ultrasonic treatment tank, 10-sealed shell, 11-ultrasonic generator, 12-stirrer, 13-water outlet pipe, 14-peristaltic pump, 15-stirring shaft, 16-stirring rod, 17-driving motor, 18-stirring support rod, 19-curved rod, 20-aeration pump, 21-aeration head, 22-mixed filler and 23-dephosphorization tank.
Detailed Description
The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.
As shown in fig. 1, a high-efficiency biological denitrification system for sewage treatment comprises a sewage tank 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, a secondary sedimentation tank 5, a hydrolysis acidification tank 6, a dephosphorization tank 23 and a circulation tank 7 which are sequentially communicated, wherein a sludge outlet of the circulation tank 7 is communicated with the anoxic tank 3; the upper part of the circulating pool 7 is provided with a water outlet 8.
The sewage is treated by an anaerobic tank 2, an anoxic tank 3 and an aerobic tank 4 in sequence and then enters a secondary sedimentation tank 5 for sedimentation, and the bottom of the secondary sedimentation tank 5 is connected with a pipeline communicated with a hydrolysis acidification tank 6; the precipitated sludge enters a hydrolysis acidification tank 6, after hydrolysis, the sludge enters a dephosphorization tank 23 for dephosphorization, and hydrolysis acidification products entering a circulation tank 7 are guided to an anoxic tank 3, so that the denitrification efficiency of denitrifying bacteria such as denitrifying bacteria in the anoxic tank 3 is enhanced, and the reduction treatment and resource utilization of the residual sludge are realized.
In the preferred embodiment of the invention, the bottom of the secondary sedimentation tank 5 is sequentially communicated with an ultrasonic treatment tank 9 and a hydrolysis acidification tank 6; the secondary sedimentation tank 5 is communicated with the hydrolysis acidification tank 6; at least one sealing shell 10 is respectively arranged on the periphery and the bottom of the inner wall of the ultrasonic treatment pool 9; an ultrasonic generator 11 is arranged in the sealing shell 10; the bottom of the ultrasonic treatment pool 9 is provided with a stirrer 12; the ultrasonic generators 11 are arranged on the side wall and the bottom of the sludge to enable the sludge to receive sufficient ultrasonic action; half of the sludge in the secondary sedimentation tank 5 directly enters a hydrolysis acidification tank 6 for supplementing the content of microorganisms; the other half enters an ultrasonic wave treatment pool 9 for ultrasonic wave cell dissolving treatment; the agitator 12 is a conventional agitator 12, and thus its detailed structure will not be described here.
In a preferred embodiment of the present invention, the wastewater tank 1 is communicated with a water inlet pipe; a water outlet pipe 13 is arranged at the lower part or the bottom of the side wall of the water tank; the pipelines between the water outlet pipe 13, the secondary sedimentation tank 5, the hydrolysis acidification tank 6, the dephosphorization tank 23 and the circulation tank 7 are respectively provided with a peristaltic pump 14.
In a preferred embodiment of the invention, stirring devices are arranged in the anaerobic tank 2, the anoxic tank 3 and the aerobic tank 4 to prevent sedimentation; the stirring device comprises a stirring shaft 15 and a stirring rod 16 penetrating through the stirring shaft 15; one end of the stirring shaft 15 is positioned outside the tank and is connected with a driving motor 17 for driving the stirring shaft to rotate; the side walls of the ends of the stirring rods 16 positioned at the two sides of the stirring shaft 15 are connected with a plurality of stirring support rods 18, and all the stirring support rods 18 are formed into a horn shape or a round shape in the vertical direction; the final tubaeform or circular agitating unit who forms can effectual stirring each aspect in the vertical direction sewage make its mixture more even, can more effective reaction.
In the preferred embodiment of the present invention, at least one cross bar or curved bar 19 is connected to all the stirring struts 18 in the shape of a horn or a circle; the stirring effect is increased, and sludge sedimentation is more effectively prevented; the curved bar 19 or the cross bar and the stirring support bar 18 cooperate with each other to make the water layers on all layers in the vertical direction of the sewage more effectively mixed.
In a preferred embodiment of the present invention, a high efficiency biological denitrification system for sewage treatment further comprises an aeration pump 20; the anoxic tank 3 and the aerobic tank 4 are respectively provided with an aeration head 21, and the aeration heads 21 in the anoxic tank 3 and the aerobic tank 4 are respectively communicated with an aeration pump 20; used for supplying oxygen to the anoxic tank 3 and the aerobic tank 4.
In the preferred embodiment of the present invention, the hydrolytic acidification tank 6 is filled with a mixed filler 22 of polyethylene composite material spheres and spherical medical stones, which have a plurality of surfaces; the mixed filler 22 accounts for 30-50% of the volume of the hydrolytic acidification tank 6; and the hydrolysis acidification tank 6 is used for carrying out anaerobic hydrolysis treatment on the ultrasonically treated sludge, and the treated sludge realizes the separation of organic sludge and inorganic silt in the treated sludge.
In a preferred embodiment of the invention, Mg Cl2 in the phosphorus removal tank 23 forms struvite crystals to remove phosphorus from the acidified product; MgCl2 is added according to the concentration of NH4+ and PO4+ of the sludge treated in the hydrolysis acidification device, struvite crystals generated in the device are collected and utilized, and the sludge treated after phosphorus removal is collected by overflowing and lifted to an anoxic tank 3 by a peristaltic pump 14 to complete the internal carbon source reflux circulation.
The invention adopts the principle that sewage enters a secondary sedimentation tank 5 for sedimentation after being treated by an anaerobic tank 2, an anoxic tank 3 and an aerobic tank 4 in sequence; the supernatant of the secondary sedimentation tank 5 is communicated with a drain pipe for discharging; half of the sludge in the secondary sedimentation tank 5 directly enters a hydrolysis acidification tank 6 for supplementing the content of microorganisms; the other half enters an ultrasonic wave treatment pool 9 for ultrasonic wave cell dissolving treatment; the hydrolysis acidification tank 6 carries out anaerobic hydrolysis treatment on the ultrasonically treated sludge, and the treated sludge realizes separation of organic sludge and inorganic silt in the treated sludge; and after phosphorus removal, the treated sludge in the phosphorus removal tank 23 is overflowed and collected, and is lifted to the anoxic tank 3 through the peristaltic pump 14, so that internal carbon source reflux circulation is completed.
The invention can effectively crush the sludge cells by utilizing the ultrasound, thereby releasing a large amount of organic matters into the liquid phase; under different sound energy densities, organic matters such as SCOD, protein and polysaccharide of the sludge are subjected to stage growth change along with the time: the growth trend is linear growth within 0-30 min, and the trend becomes slow after 30 min; therefore, when the sound energy density is larger than 1W/mL, the sludge particle size is reduced from 260-300 μm to 10-11 μm within 30 min.
The invention carries out ultrasonic pretreatment on the sludge to be used as a carbon source for recycling the sewage treatment system to strengthen the sewage denitrification efficiency, and carries out resource utilization on the excess sludge on the basis of realizing the excess sludge reduction.
The invention is well implemented in accordance with the above-described embodiments. It should be noted that, based on the above structural design, in order to solve the same technical problems, even if some insubstantial modifications or colorings are made on the present invention, the adopted technical solution is still the same as the present invention, and therefore, the technical solution should be within the protection scope of the present invention.
Claims (8)
1. The utility model provides a high-efficient biological denitrogenation system for sewage treatment which characterized in that: the device comprises a sewage tank (1), an anaerobic tank (2), an anoxic tank (3), an aerobic tank (4), a secondary sedimentation tank (5), a hydrolysis acidification tank (6), a dephosphorization tank (23) and a circulation tank (7) which are sequentially communicated, wherein a sludge outlet of the circulation tank (7) is communicated with the anoxic tank (3); the upper part of the circulating pool (7) is provided with a water outlet (8).
2. The high efficiency biological denitrification system for wastewater treatment as set forth in claim 1, wherein: the bottom of the secondary sedimentation tank (5) is sequentially communicated with an ultrasonic treatment tank (9) and a hydrolysis acidification tank (6); the secondary sedimentation tank (5) is communicated with the hydrolysis acidification tank (6); at least one sealing shell (10) is respectively arranged on the periphery and the bottom of the inner wall of the ultrasonic treatment pool (9); an ultrasonic generator (11) is arranged in the sealing shell (10); the bottom of the ultrasonic treatment pool (9) is provided with a stirrer (12).
3. The high efficiency biological denitrification system for wastewater treatment as set forth in claim 2, wherein: the sewage tank (1) is communicated with a water inlet pipe; a water outlet pipe (13) is arranged at the lower part or the bottom of the side wall of the water tank; the pipelines between the water outlet pipe (13), the secondary sedimentation tank (5), the hydrolysis acidification tank (6), the dephosphorization tank (23) and the circulation tank (7) are respectively provided with a peristaltic pump (14).
4. A high efficiency biological denitrification system for wastewater treatment according to any of claims 1-3 wherein: stirring devices are arranged in the anaerobic tank (2), the anoxic tank (3) and the aerobic tank (4) to prevent sedimentation; the stirring device comprises a stirring shaft (15) and a stirring rod (16) penetrating through the stirring shaft (15); one end of the stirring shaft (15) is positioned outside the pool and is connected with a driving motor (17) for driving the stirring shaft to rotate; the side walls of the end parts of the stirring rods (16) positioned at the two sides of the stirring shaft (15) are connected with a plurality of stirring support rods (18), and all the stirring support rods (18) are formed into a horn shape or a round shape in a surrounding mode in the vertical direction.
5. The high efficiency biological denitrification system for wastewater treatment as set forth in claim 4, wherein: at least one cross bar or curved bar (19) is connected to all horn-shaped or round stirring struts (18).
6. The high efficiency biological denitrification system for wastewater treatment as set forth in claim 5, wherein: also comprises an aeration pump (20); the anoxic tank (3) and the aerobic tank (4) are respectively provided with an aeration head (21), and the aeration heads (21) in the anoxic tank (3) and the aerobic tank (4) are respectively communicated with an aeration pump (20).
7. The high efficiency biological denitrification system for wastewater treatment as set forth in claim 6, wherein: the hydrolysis acidification pool (6) is filled with a mixed filler (22) of a polyethylene composite material sphere with a plurality of surfaces and spherical medical stone; the mixed filler (22) accounts for 30-50% of the volume of the hydrolytic acidification tank (6).
8. The high efficiency biological denitrification system for wastewater treatment as set forth in claim 7, wherein: mg Cl2 in the phosphorus removal tank (23) forms struvite crystals to carry out phosphorus removal treatment on the acidified products.
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| CN201911072247.3A CN110776200A (en) | 2019-11-05 | 2019-11-05 | A high-efficient biological denitrogenation system for sewage treatment |
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| CN201911072247.3A CN110776200A (en) | 2019-11-05 | 2019-11-05 | A high-efficient biological denitrogenation system for sewage treatment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2128250A1 (en) * | 1996-12-27 | 1999-05-01 | Infilco Espanola S A | Systems for the biological removal of nitrogen and phosphorus in a process using activated sludges |
| CN101575159A (en) * | 2009-06-12 | 2009-11-11 | 哈尔滨工业大学 | Method of intensified denitrification and dephosphorization of urban sewage |
| CN201746425U (en) * | 2010-05-26 | 2011-02-16 | 北京伊普国际水务有限公司 | Treatment system for nitrogen and phosphorus in urban sewage |
| CN109205785A (en) * | 2018-10-09 | 2019-01-15 | 山东建筑大学 | City domestic sewage denitrification dephosphorization system and method are strengthened in excess sludge reduction processing |
-
2019
- 2019-11-05 CN CN201911072247.3A patent/CN110776200A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2128250A1 (en) * | 1996-12-27 | 1999-05-01 | Infilco Espanola S A | Systems for the biological removal of nitrogen and phosphorus in a process using activated sludges |
| CN101575159A (en) * | 2009-06-12 | 2009-11-11 | 哈尔滨工业大学 | Method of intensified denitrification and dephosphorization of urban sewage |
| CN201746425U (en) * | 2010-05-26 | 2011-02-16 | 北京伊普国际水务有限公司 | Treatment system for nitrogen and phosphorus in urban sewage |
| CN109205785A (en) * | 2018-10-09 | 2019-01-15 | 山东建筑大学 | City domestic sewage denitrification dephosphorization system and method are strengthened in excess sludge reduction processing |
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Application publication date: 20200211 |