CN110526397B - （AO） 2 Integrated multistage sedimentation circulating reactor - Google Patents
（AO） 2 Integrated multistage sedimentation circulating reactor Download PDFInfo
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- CN110526397B CN110526397B CN201910735583.5A CN201910735583A CN110526397B CN 110526397 B CN110526397 B CN 110526397B CN 201910735583 A CN201910735583 A CN 201910735583A CN 110526397 B CN110526397 B CN 110526397B
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- 238000004062 sedimentation Methods 0.000 title claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000010865 sewage Substances 0.000 claims abstract description 78
- 239000010802 sludge Substances 0.000 claims abstract description 34
- 238000005192 partition Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims description 83
- 238000005273 aeration Methods 0.000 claims description 20
- 238000005276 aerator Methods 0.000 claims description 18
- 238000001556 precipitation Methods 0.000 claims description 17
- 238000007790 scraping Methods 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 16
- 238000009792 diffusion process Methods 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 14
- 229910052698 phosphorus Inorganic materials 0.000 description 14
- 239000011574 phosphorus Substances 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 238000009434 installation Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 150000001413 amino acids Chemical class 0.000 description 2
- 230000001651 autotrophic effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- -1 NO3- Chemical compound 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001079 digestive effect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- 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
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- C02F3/308—Biological phosphorus removal
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The application relates to the technical field of sewage treatment equipment, in particular to An (AO) 2 The sedimentation integrated multistage circulation reactor comprises a shell, a water inlet pipe and a lifting device, wherein an anaerobic zone, a first aerobic zone, a facultative zone, a second aerobic zone and a sedimentation zone which are in circulation connection are isolated in the shell through a partition plate, the anaerobic zone is positioned at the middle lower part of the shell, the first aerobic zone, the facultative zone, the second aerobic zone and the sedimentation zone are sequentially arranged at the upper part of the shell from inside to outside, sewage sequentially flows in the first aerobic zone, the facultative zone, the second aerobic zone, the sedimentation zone and the anaerobic zone by virtue of water level difference without power, clear water in the sedimentation zone overflows from the outer side of the upper part of the sedimentation zone, and part of sludge in the sedimentation zone is discharged through a sludge discharge pipe; the water inlet pipe supplies sewage to the anaerobic zone and the facultative zone in proportion; the lifting device is used for lifting sewage in the anaerobic zone to the first aerobic zone. The reactor has small occupied area and small investment.
Description
Technical Field
The application relates to the technical field of sewage treatment equipment, in particular to An (AO) 2 -a precipitation integrated multistage circulation reactor.
Background
a/O method: A/O is an abbreviation of an Anoxic/Oxic, A is an Anoxic zone, O is an Oxic zone, and O is an aerobic zone, (AO) 2 Represents anoxic and aerobic circulation, and is a treatment method for degrading organic pollutants and having denitrification and dephosphorization functions.
The A/O technology is widely paid attention to because of the special economic and technical advantages and environmental benefits, the A/O technology connects a front anoxic section and a rear aerobic section in series, and the heterotrophic bacteria in the anoxic section hydrolyze suspended pollutants such as starch, fiber, carbohydrate and the like in sewage into organic acids, so that macromolecular organic matters are decomposed into micromolecular organic matters, insoluble organic matters are converted into soluble organic matters, and when the products after anoxic hydrolysis enter an aerobic zone for aerobic treatment, the biodegradability and oxygen efficiency of the sewage can be improved; in the anoxic zone, the heterotrophic bacteria ammonify pollutants such as protein, fat and the like (N on an organic chain or amino in amino acid) to release ammonia (NH 3 and NH4+), under the condition of sufficient oxygen supply, the autotrophic bacteria nitrify to oxidize NH3-N (NH4+) into NO3-, and return to the zone A through reflux control, and under the anoxic condition, the denitrification of the heterotrophic bacteria reduces NO 3-into molecular nitrogen (N2) to complete the ecological circulation of C, N, O, thereby realizing the harmless treatment of sewage. The A/O process not only can obtain satisfactory denitrification effect, but also can obtain high COD and BOD removal rate through the anoxic-aerobic cycle operation. Meanwhile, the raw sewage is distributed into the biological area by adopting a segmented water inlet technology to form an alternating multi-stage anoxic/aerobic environment, the biological dephosphorization and denitrification effect can be enhanced, and an anaerobic area is arranged at the first section of the biological area, so that a good anaerobic dilute phosphorus environment is created, and the total phosphorus in the sewage is effectively removed.
The multistage A/O process has the characteristics of simple pretreatment and sludge treatment, good and stable effect, low investment, high efficiency of an aeration system, simple maintenance and management and the like, is suitable for occasions with small and medium scale, low groundwater level and suitable soil conditions for soil area structures, but has certain limitations in design, such as the areas of an original sewage tank, an anaerobic area, an aerobic area, a sedimentation area and the like are generally arranged from front to back in sequence, and most of the treatment areas need to adopt an electric pump to convey sewage or sludge, and have large occupied area, large investment and the like.
The rural sewage has the characteristics of small sewage quantity, a large amount of organic matters, nitrogen, phosphorus and other inorganic salts in the sewage, very unstable water quality and large water quantity day-and-night change, and the existing multi-stage A/O sewage treatment system is adopted to treat the rural sewage, so that the problems of large occupied area and high investment cost exist.
The multistage AO technology is suitable for treating sewage with high sludge concentration, carbon sources can be fully utilized, and the shock load resistance is strong, but the prior multistage AO for sewage treatment generally adopts 2 to 4 stages in actual engineering due to the limitation of occupied area and cost, but the relation between the denitrification efficiency and the stages is that:
η＝[1-(1/n)×1/(1+R)]×100％
(wherein eta-total nitrogen removal rate of nitrogen,%; n-A/O reactor stage number, stage; R-first stage anoxic zone sludge reflux ratio,%),
it can be seen that: the more the reactor stages, the higher the denitrification efficiency. Therefore, how to make the reactor approach infinite AO under the condition of small occupied area by the multi-stage AO process through cyclic treatment solves the contradiction between the stage number of the multi-stage AO and the occupied area and the cost in the prior art, and is a problem to be solved in rural sewage treatment.
Disclosure of Invention
The object of the present application is to provide An (AO) which addresses the above-mentioned problems and disadvantages 2 The sedimentation integrated multistage circulating reactor well solves the contradiction between the stage number of multistage AO and the occupied area and the cost in the prior art, has small occupied area and small investment, and is suitable for treating sewage with high sludge concentration.
In order to achieve the above purpose, the technical scheme of the application is as follows:
a kind of (AO) 2 The sedimentation integrated multistage circulating reactor comprises a shell, a water inlet pipe and a lifting device, wherein an anaerobic zone, a first aerobic zone, a facultative zone, a second aerobic zone and a sedimentation zone which are in circulating connection are isolated in the shell through a partition plate, the anaerobic zone is positioned at the middle lower part of the shell, the first aerobic zone, the facultative zone, the second aerobic zone and the sedimentation zone are sequentially arranged at the upper part of the shell from inside to outside, sewage sequentially flows in the first aerobic zone, the facultative zone, the second aerobic zone, the sedimentation zone and the anaerobic zone by virtue of water head, clear water in the sedimentation zone overflows from the outer side of the upper part of the sedimentation zone, and part of sludge in the sedimentation zone is discharged through a sludge discharge pipe; the water inlet pipe supplies sewage to the anaerobic zone and the facultative zone in proportion; the lifting device is used for lifting sewage in the anaerobic zone to the first aerobic zone.
According to (AO) 2 A precipitation integrated multistage circulating reactor, said partition plate includes horizontal partition plate and a reactor disposed on the horizontal partition plateThe sewage in the first aerobic zone overflows into the facultative zone through an upper channel between the sewage in the first aerobic zone and the facultative zone, the sewage in the facultative zone flows into the second aerobic zone through a bottom channel between the sewage in the facultative zone and the second aerobic zone, the sewage in the second aerobic zone flows into the sedimentation zone through a perforated wall between the sewage in the second aerobic zone and the upper part of the sedimentation zone, and part of sewage in the sedimentation zone flows into the anaerobic zone through a gap between the bottom of the sewage in the sedimentation zone and the anaerobic zone.
According to (AO) 2 -a precipitation integrated multistage circulation reactor, the lifting device being a plurality of jet aerators arranged on a partition between the first aerobic zone and the anaerobic zone.
According to (AO) 2 The jet aerator comprises a suction chamber, a vibration cavity and a diffusion pipe which are sequentially connected from bottom to top, an upper end outlet of the diffusion pipe is communicated with the first aerobic zone, an air inlet and a water absorption hole are formed in the end face of the lower end of the suction chamber, the air inlet is connected with a main air pipeline which is led into the anaerobic zone from the outside of the shell through a first air pipeline, the main air pipeline is connected with a blower, and the water absorption hole is communicated with the anaerobic zone.
According to (AO) 2 -a sedimentation integrated multistage circulation reactor, wherein a plurality of aeration heads are arranged in the second aerobic zone, and the aeration heads are connected with a main air pipeline through a second air pipeline.
According to (AO) 2 The sedimentation integrated multistage circulating reactor is characterized in that a first water inlet valve and a second water inlet valve are connected in parallel to the water inlet pipe, the first water inlet valve is used for adjusting the water supply amount to the anaerobic zone, and the second water inlet valve is used for adjusting the water supply amount to the facultative zone.
According to (AO) 2 The sedimentation integrated multistage circulating reactor also comprises a linkage stirrer, wherein the linkage stirrer comprises a stirring shaft driving device, a stirring shaft upper section, a slag scraping plate, a gearbox II, a stirring shaft lower section, a stirring paddle I and a stirring paddle II, the stirring shaft driving device drives the stirring shaft upper section to rotate, and the slag scraping plate is arranged on the stirring shaft upper sectionThe slag plate is connected with the upper section of the stirring shaft through a truss, and the slag scraping plate is arranged on the surface of the sedimentation zone; the stirring shaft lower section is connected with the stirring shaft upper section through a gearbox II, the stirring paddles I and the stirring paddles II are connected with the stirring shaft lower section, the stirring paddles I are arranged in the anaerobic zone, and the stirring paddles II are arranged in the facultative zone.
According to (AO) 2 The stirring shaft driving device comprises a motor and a gearbox I, the motor is connected with the gearbox I, the gearbox I is connected with the upper section of the stirring shaft, and the upper section of the stirring shaft and the lower section of the stirring shaft are coaxially arranged.
According to (AO) 2 The sedimentation integrated multistage circulating reactor is characterized in that an effluent weir is arranged on the circumferential side edge of the upper part of the sedimentation zone, a sludge discharge pipe is arranged on the lower part of the sedimentation zone, and a sludge discharge valve is connected to the sludge discharge pipe.
According to (AO) 2 The sedimentation integrated multistage circulating reactor is characterized in that the lower part of the shell is in an inverted cone shape, the first aerobic zone, the facultative zone and the second aerobic zone are positioned at the upper part of the anaerobic zone, the sedimentation zone is positioned on the inverted cone-shaped side wall of the shell, and the inclination angle of the inverted cone-shaped side wall of the shell is set to be 45-60 degrees.
The application (AO) 2 The beneficial effects of the precipitation integrated multistage circulation reactor are that:
1. the application (AO) 2 The sedimentation integrated multistage circulation reactor enables the multistage AO process to approach infinite AO under the condition of small occupied area by carrying out circulation treatment on sewage in a plurality of subareas of a shell, so that the contradiction between the stage number of the multistage AO and the occupied area and the cost in the prior art is well solved, in addition, the sewage is circulated with the sedimentation area through two AO, the power of the sewage flowing back from the sedimentation area to the anaerobic area can be reduced, a sludge and digestive juice reflux pump is omitted, and the occupied area is reduced;
2. the application is mainly aimed at rural sewage treatment, because the rural sewage has the characteristics of small sewage quantity, a large amount of organic matters, nitrogen, phosphorus and other inorganic salts in the sewage, very unstable water quality and large water quantity day-night change, and the reactor is used for treating sewage with small water quantity and high sludge concentration, and the carbon source can be fully utilized and has strong shock load resistance;
3. the application (AO) 2 The sedimentation integrated multistage circulation reactor only needs to be lifted once in the whole reaction process, namely, sewage in the anaerobic zone enters the first aerobic zone through the jet aerator, and the rest circulation is not required to be lifted, so that the energy is saved, the installation is convenient, the space is saved, and the installation energy and the labor cost are reduced;
4. the jet aerator is arranged on the partition plate between the anaerobic zone and the second aerobic zone, has the advantages of simple installation, convenient operation, compact structure, basically no occupied area, cost saving, high treatment efficiency and low operation cost, and has good aeration efficiency, higher aeration efficiency, high oxygen absorption rate, high power efficiency, 1-2 times higher than the traditional aeration treatment efficiency and obviously shortened aeration time because the air pipeline outside the device is connected with the air blower;
5. the combined stirrer is characterized in that the upper section and the lower section of the stirring shaft are coaxially arranged in a two-stage transmission mode through the motor, the upper section of the stirring shaft drives the slag scraping plate to rotate for scraping slag, the lower section of the stirring shaft drives the stirring paddles I and II to rotate for stirring, the requirements of different rotating speeds of the slag scraping plate, the stirring paddles I and II can be met, electric power can be saved, the installation is convenient, meanwhile, the installation space is saved, and in addition, the stirring paddles and the slag scraping plate can rotate simultaneously for stirring and scraping slag, so that the operation is convenient;
6. the lower part of the shell is in an inverted conical table shape, the sedimentation area is positioned on the inverted conical table-shaped side wall of the shell, and the inclination angle of the inverted conical table-shaped side wall of the shell is set to be 45-60 degrees, so that residual sewage and sludge can flow back conveniently.
Drawings
FIG. 1 is a block diagram of an embodiment (AO) according to the present application 2 -structural schematic of a precipitation-integrated multistage circulation reactor;
fig. 2 is a schematic structural view of a jet aerator according to an embodiment of the present application.
Fig. 3 is a schematic structural view of a linkage agitator according to an embodiment of the present application.
FIG. 4 is a block diagram of an embodiment (AO) according to the present application 2 -a schematic of the structure of the precipitation integrated multistage circulation reactor with the linkage stirrer removed.
In the figure: the device comprises a first anaerobic zone, a second aerobic zone, a third facultative zone, a fourth aerobic zone, a fifth sedimentation zone, a 1-water inlet pipe, a first 2-water inlet valve, a second 3-water inlet valve, a 4-main air pipeline, a 41-first air pipeline, a 42-second air pipeline, a first 5-stirring paddle, a 6-jet aerator, a 61-water inlet, a 62-suction chamber, a 63-vibration cavity, a 64-diffusion pipe, a 65-air inlet, a second 7-stirring paddle, an 8-aeration head, a 9-mud discharge pipe, a 10-mud valve, a 11-water outlet weir, a 12-truss, a 13-slag scraping plate, a 14-stirring shaft upper section, a 15-motor, a 16-gearbox I, a 17-gearbox II, a 18-shell, a 19-blower, a 20-perforated flower wall and a 21-stirring shaft lower section.
Detailed Description
The following description of the application (AO) is made in connection with the accompanying drawings by way of specific embodiments 2 The precipitation integrated multistage circulation reactor is described in more detail.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Referring to FIGS. 1 and 4, one (AO) of the present embodiment 2 The sedimentation integrated multistage circulation reactor comprises a shell 18, a water inlet pipe 1 and a lifting device, wherein an anaerobic zone I, a first aerobic zone II, a facultative zone III, a second aerobic zone IV and a sedimentation zone V which are in circulation connection are isolated in the shell 18 through partition plates, each partition plate comprises a horizontal partition plate and a plurality of annular partition plates arranged on the upper part of the horizontal partition plate, and the anaerobic zone I is positioned on the middle lower part of the shell 18 and is the first oneThe sewage flows into the sedimentation zone V from inside to outside in sequence in the first aerobic zone II, the facultative zone III, the second aerobic zone IV, the sedimentation zone V and the anaerobic zone I by virtue of water level difference, in the embodiment, specifically, the sewage in the first aerobic zone II overflows into the facultative zone III through an upper channel between the sewage and the facultative zone III, the sewage in the facultative zone III flows into the second aerobic zone IV through a bottom channel between the sewage and the second aerobic zone IV, the sewage in the second aerobic zone IV flows into the sedimentation zone V through a perforated wall 20 between the sewage and the upper part of the sedimentation zone V, the sewage flowing into the sedimentation zone V through the perforated wall 20 can reduce disturbance on the sewage in the sedimentation zone V as much as possible, the sludge in the sedimentation zone V is convenient to sediment, part of the sewage in the sedimentation zone V flows back to the anaerobic zone I through a notch between the bottom of the sedimentation zone V and the anaerobic zone I, the clear water in the sedimentation zone V overflows from the outer side of the upper part of the sedimentation zone V, and part of the sludge in the sedimentation zone V is discharged through a sludge discharge pipe 9; the water inlet pipe 1 supplies sewage to the anaerobic zone I and the facultative zone III in proportion; the lifting device is used for lifting sewage in the anaerobic zone I to the first aerobic zone II, the whole circulating reactor only performs one-time lifting, the sewage enters the anaerobic zone I under the action of water head difference, air enters the jet aerator 6 by supplying power to the air blower 19, and enters the first aerobic zone II after being mixed with the sewage in the anaerobic zone I, the whole circulating process only performs one-time lifting, the energy is saved, the installation is convenient, the space is saved, and the installation energy and the labor cost are reduced.
In the embodiment, preferably, the lifting device is a plurality of jet aerators 6, and the jet aerators 6 are arranged on the partition plate between the first aerobic zone II and the anaerobic zone I, so that the device is simple to install, convenient to operate, compact in structure, basically free of occupied area, and has the advantages of cost saving, high treatment efficiency and low operation cost; the aeration jet device 6 is used between the anaerobic zone I and the second aerobic zone II, belongs to an oxygen supply device for aerobic bacteria in sewage, and has good oxygenation effect.
Specifically, one possible implementation of the jet aerator 6 in this embodiment is: the jet aerator 6 comprises a suction chamber 62, a vibrating cavity 63 and a diffusion pipe 64 which are sequentially connected from bottom to top, wherein an upper end outlet of the diffusion pipe 64 is communicated with a first aerobic zone II, an air inlet 65 and a water absorption hole 61 are formed in the end face of the lower end of the suction chamber 62, the air inlet 65 is connected with a main air pipeline 4 which is led into an anaerobic zone I from the outside of the shell 18 through a first air pipeline 41, the main air pipeline 4 is connected with a blower 19, the blower 19 is arranged outside the shell 18, and the water absorption hole 61 is communicated with the anaerobic zone I; in the jet aerator 6 in the embodiment, the traditional aeration jet aerator 6 is modified, so that an air inlet 65 and water suction holes 61 are positioned on the same side, 2-4 water suction holes 61 are arranged simultaneously in consideration of the reflux ratio of the device, and air and water are mixed and then sprayed into a second aerobic zone IV through an upper diffusion pipe 64. Meanwhile, without a submersible pump, the air is pushed to rise by the blower 19, negative pressure is formed in the suction chamber 62, water is pressed into the suction chamber 62, air-water mixing is performed in the oscillating cavity 63, and then the mixed liquid is sprayed out by the diffusion pipe 64; because the device is externally connected with the air blower 19, the aeration efficiency is higher, sewage is extruded from the lower part and is fully mixed, the oxygen absorption rate is high, and the power efficiency is high. The aeration treatment efficiency is 1-2 times higher than that of the traditional aeration treatment, and the aeration time can be obviously shortened.
In this embodiment, preferably, a plurality of aeration heads 8 are disposed in the second aerobic zone iv, the plurality of aeration heads 8 are connected with the 42 main air pipeline 4 through the second air pipeline, the plurality of aeration heads 8 and the jet aerator 6 share one main air pipeline 4, the installation and arrangement are convenient and simplified, and the occupation of the pipeline arrangement to the space in the shell 18 is reduced.
In this embodiment, preferably, the water inlet pipe 1 is connected with the water inlet valve 1 in parallel with the water inlet valve 2 and the water inlet valve 3, the water inlet valve 2 is used for adjusting the water supply amount to the anaerobic zone I, the water inlet valve 3 is used for adjusting the water supply amount to the facultative zone III, and the opening degrees of the water inlet valve 2 and the water inlet valve 3 can be adjusted according to specific conditions.
In the present embodiment, preferably, one (AO) of the present embodiment 2 The sedimentation integrated multistage circulating reactor also comprises a linkage stirrer, wherein the linkage stirrer comprises a stirring shaft driving device, a stirring shaft upper section 14, a slag scraping plate 13, a gearbox II 17, a stirring shaft lower section 21, a stirring paddle I5 and a stirring paddle II 7, and the stirring shaft driving device drives the stirring shaft upper section 14 to rotate, and the slag scraping plate 13The slag scraping plate 13 is arranged on the surface of the sedimentation zone V and is connected with the upper section 14 of the stirring shaft through a truss; the lower section 21 of the stirring shaft is connected with the upper section 14 of the stirring shaft through a second gearbox 17, the first stirring paddle 5 and the second stirring paddle 7 are both connected with the lower section 21 of the stirring shaft, the first stirring paddle 5 is arranged in the anaerobic zone I, the second stirring paddle 7 is arranged in the facultative zone III, the second stirring paddle 7 is connected with the lower section 21 of the stirring shaft through a horizontal connecting frame, and the horizontal connecting frame passes through an upper channel between the first aerobic zone II and the facultative zone III, so that stirring can be performed in an annular area in the facultative zone III without interference with the side wall of the facultative zone III.
On the basis of the above scheme, more preferably, the stirring shaft driving device comprises a motor 15 and a gearbox I16, the motor 15 is connected with the gearbox I16, the gearbox I16 is connected with the stirring shaft upper section 14, and the stirring shaft upper section 14 and the stirring shaft lower section 21 are coaxially arranged; namely, when the motor 15 runs, the stirring shaft upper section 14 and the stirring shaft lower section 21 can be simultaneously driven to rotate, so that the stirring paddles I5, II 7 and 13 synchronously rotate, and the rotating speeds of the stirring paddles I13, 5 and 7 are regulated through the transmission of the transmission case I16 and the transmission case II 17, so that the requirements of different rotating speeds of the stirring paddles I13, 5 and 7 are met. The upper section 14 and the lower section 21 of the stirring shaft are driven to rotate by one motor 15, so that the electric power can be saved, the installation is convenient, and the space is saved; secondly, stirring rake 5, stirring rake two 7 rotate simultaneously with scraping the sediment board 13, can stir and scrape the sediment in step, convenient operation.
In the embodiment, preferably, the upper circumferential side edge of the sedimentation zone V is provided with a water outlet weir 11, the lower part of the sedimentation zone V is provided with a mud pipe 9, and the mud pipe 9 is connected with a mud valve 10; clear water in the sedimentation zone V enters the peripheral water outlet weir 9 and flows out, the rest sludge is discharged through the sludge discharge pipe 7, circulating sewage and return sludge are returned to the anaerobic zone I due to the power provided by the blower 19, the lower part of the shell 18 is in an inverted cone shape, the first aerobic zone II, the facultative zone III and the second aerobic zone IV are positioned at the upper part of the anaerobic zone I, the sedimentation zone V is positioned on the inverted cone-shaped side wall of the shell 18, a certain gap is arranged between the horizontal partition plate in the shell 18 and the inverted cone-shaped side wall of the shell 18 so as to leave a gap between the sedimentation zone V and the anaerobic zone I, the inclination angle of the inverted cone-shaped side wall of the shell 18 is set to be 45-60 degrees, namely, the inclination angle of the bottom of the sedimentation zone V is 45-60 degrees, and the rest sewage and sludge are convenient to flow back.
In this embodiment, according to the water quality characteristics of the industrial wastewater obtained by the sewage plant, the related analysis data statistics of the wastewater in the same type of industry, and the related water quality report, the water quality of the test wastewater of the application is shown in the following table:
during the test, raw sewage enters an anaerobic zone I from a water inlet pipe 1 and a part of the raw sewage enters the anaerobic zone I from a water inlet valve I2 to perform denitrification, reduce NOx into molecular nitrogen N2 and simultaneously release phosphorus; the other part enters the facultative zone III through the water inlet valve II 3 to supplement the carbon source. Sewage in the anaerobic zone I is stirred by stirring slurry 5 and is sent into the first aerobic zone II by jet aerator 6. In a first aerobic zone II, autotrophic bacteria perform nitrification, NH3-N (NH4+) is oxidized into NOx-, and phosphorus is absorbed by phosphorus accumulating bacteria; then sewage enters the facultative zone III through an upper channel between the first aerobic zone II and the facultative zone III to start denitrification; the sewage after the reaction enters a second aerobic zone IV from a lower passage between a facultative zone III and the second aerobic zone, is aerated by an aeration head 8, and then is subjected to nitrification, and meanwhile, phosphorus is further absorbed; and then sewage enters the sedimentation zone V through a perforated wall 20 between the second aerobic zone IV and the upper part of the sedimentation zone V for sedimentation, part of clear water is discharged from the water outlet weir 11, one part of sludge in the sedimentation zone V is discharged through the sludge discharge pipe 9, and the other part of sludge flows back to the anaerobic zone I along with the mixed liquor for next circulation, so that the device can approach infinite-level circulation AO treatment.
The inflow rate of sewage entering the anaerobic zone I and the facultative zone III is controlled by a first water inlet valve 2 and a second water inlet valve 3 according to the need; the sludge reflux ratio is 100%; during the reaction, the DO of the first aerobic zone II and the second aerobic zone IV is controlled to be about 2.0mg/L, and the DO of the anaerobic zone I and the facultative zone III is controlled to be below 0.5mg/L, so that the activated sludge in the anaerobic zone I and the facultative zone III, the activated sludge in the first aerobic zone II and the activated sludge in the second aerobic zone IV are subjected to denitrification and nitration under proper conditions.
Experiments prove that when the COD of the inflow water is 354mg/L, the COD of the outflow water is 30mg/L on average, the average COD removal rate is 91.53%, and the first grade A standard of urban sewage discharge is met. When the average of the NH4 < + > -N in the water is 75.68mg/L, the average of the NH4 < + > -N in the water outlet is 4.38mg/L, and the average NH4 < + > -N removal rate is 94.21 percent. The removal rate was 82.77% based on the average value of TN in and out of water of 78.46mg/L and 13.52 mg/L.
The COD removal rate of the nitrogen and phosphorus removal device reaches more than 90%, the removal rate of NH4 < + > -N is improved from 60% to 80% or even 90% from the original TN removal rate of more than 90%, and the system achieves good nitrogen removal effect. The ammonia nitrogen value of the outlet water of the water outlet is at least 1mg/L; the phosphorus value of the discharged water is about 0.5mg/L, and the removal rate reaches about 60-70%; the DO value of the effluent water of the sewage treatment area is not lower than 0.5mg/L.
In addition, in this embodiment, COD, DO, TN, TP has the following meanings:
COD (chemical oxygen demand): is an abbreviation of Chemical Oxygen Demand, which is the amount of oxidant consumed when treating a water sample with a strong oxidant under certain conditions. It is an indicator of how much reducing material is in the water.
DO (dissolved oxygen): abbreviations for distributed Oxygen refer to molecular Oxygen Dissolved in water, referred to as Dissolved Oxygen, expressed in milligrams of Oxygen per liter of water.
TN (total nitrogen): the abbreviation for Total Nitrogen refers to the Total amount of inorganic and organic Nitrogen of various forms in water. Inorganic nitrogen such as NO3-, NO2-, and NH4+ and organic nitrogen such as protein, amino acid, and organic amine, calculated as milligrams of nitrogen per liter of water.
TP (total phosphorus): abbreviation of Total Phosphorus refers to the measurement of the amount of Phosphorus in milligrams per liter of water sample, as measured after the water sample has been digested to convert various forms of Phosphorus to orthophosphate.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms first, second and the like in the description and in the claims, do not denote any order, quantity or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. "connected" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
While the exemplary embodiments of the present application have been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that many changes and modifications can be made to the specific embodiments described above without departing from the spirit of the application, and that many combinations of technical features and structures can be made without departing from the scope of the application.
Claims (7)
1. An (AO) 2-precipitation integrated multistage loop reactor comprising:
the sewage treatment device comprises a shell, wherein an anaerobic zone, a first aerobic zone, a facultative zone, a second aerobic zone and a sedimentation zone which are circularly connected are isolated in the shell through a partition board, the anaerobic zone is positioned at the middle lower part of the shell, the first aerobic zone, the facultative zone, the second aerobic zone and the sedimentation zone are sequentially arranged at the upper part of the shell from inside to outside, sewage sequentially flows in the first aerobic zone, the facultative zone, the second aerobic zone, the sedimentation zone and the anaerobic zone by means of water level difference without power, clear water in the sedimentation zone overflows from the outer side of the upper part of the sedimentation zone, and part of sludge in the sedimentation zone is discharged through a sludge discharge pipe;
a water inlet pipe for supplying sewage to the anaerobic zone and the facultative zone in proportion;
and lifting means for lifting the sewage in the anaerobic zone to the first aerobic zone;
the partition board comprises a horizontal partition board and a plurality of annular partition boards arranged at the upper part of the horizontal partition board, sewage in the first aerobic zone overflows into the facultative zone through an upper channel between the partition boards and the facultative zone, sewage in the facultative zone flows into the second aerobic zone through a bottom channel between the partition boards and the second aerobic zone, sewage in the second aerobic zone flows into the sedimentation zone through a perforated flower wall between the partition boards and the upper part of the sedimentation zone, and part of sewage in the sedimentation zone flows into the anaerobic zone through a gap between the bottom of the partition boards and the anaerobic zone;
the lifting device is a plurality of jet flow aerators, and the jet flow aerators are arranged on a partition plate between the first aerobic zone and the anaerobic zone;
the jet aerator comprises a suction chamber, a vibration cavity and a diffusion pipe which are sequentially connected from bottom to top, wherein an upper end outlet of the diffusion pipe is communicated with a first aerobic zone, an air inlet and a water absorption hole are formed in the end face of the lower end of the suction chamber, the air inlet is connected with a main air pipeline which is led into an anaerobic zone from the outside of a shell through a first air pipeline, the main air pipeline is connected with a blower, and the water absorption hole is communicated with the anaerobic zone.
2. The (AO) 2-precipitation integrated multistage circulation reactor according to claim 1, wherein a plurality of aeration heads are disposed in the second aerobic zone, and wherein a plurality of the aeration heads are connected to the main air pipe through a second air pipe.
3. The (AO) 2-precipitation integrated multistage circulation reactor according to claim 1, wherein the first inlet valve and the second inlet valve are connected in parallel to the inlet pipe, the first inlet valve being used for adjusting the water supply to the anaerobic zone, and the second inlet valve being used for adjusting the water supply to the facultative zone.
4. The (AO) 2-precipitation integrated multistage circulation reactor according to claim 1, further comprising a linkage stirrer, wherein the linkage stirrer comprises a stirring shaft driving device, a stirring shaft upper section, a slag scraping plate, a gearbox II, a stirring shaft lower section, a stirring paddle I and a stirring paddle II, the stirring shaft driving device drives the stirring shaft upper section to rotate, the slag scraping plate is connected with the stirring shaft upper section through a truss, and the slag scraping plate is arranged on the surface of the precipitation zone; the stirring shaft lower section is connected with the stirring shaft upper section through a gearbox II, the stirring paddles I and the stirring paddles II are connected with the stirring shaft lower section, the stirring paddles I are arranged in the anaerobic zone, and the stirring paddles II are arranged in the facultative zone.
5. The (AO) 2-precipitation integrated multistage circulating reactor according to claim 4, wherein the stirring shaft driving means comprises a motor and a first gearbox, the motor is connected to the first gearbox, the first gearbox is connected to the upper stirring shaft section, and the upper stirring shaft section is coaxially disposed with the lower stirring shaft section.
6. The (AO) 2-precipitation integrated multistage circulation reactor according to claim 1, wherein an effluent weir is provided on the upper circumferential side of the precipitation zone, and the sludge discharge pipe extends from the outside of the housing into the lower portion of the precipitation zone, and a sludge discharge valve is connected to the sludge discharge pipe.
7. The (AO) 2-precipitation integrated multistage circulation reactor according to claim 1, wherein the lower portion of the shell is configured in an inverted cone shape, the first aerobic zone, the facultative zone, and the second aerobic zone are located at the upper portion of the anaerobic zone, the precipitation zone is located on an inverted cone-shaped side wall of the shell, and an inclination angle of the inverted cone-shaped side wall of the shell is set to 45 ° -60 °.
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