CN110526397B - （AO） 2 Integrated multistage sedimentation circulating reactor - Google Patents

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

(AO) 2-Precipitation integrated multi-stage circulation reactor

Technical field

The invention relates to the technical field of sewage treatment equipment, and specifically relates to an (AO) ² -precipitation integrated multi-stage circulation reactor.

Background technique

A/O method: A/O is the abbreviation of Anoxic/Oxic, A is Anoxic, which refers to the anoxic zone, O is Oxic, which refers to the aerobic zone, (AO) ² represents the anoxic and aerobic cycle, It is a treatment method that degrades organic pollutants and has the functions of nitrogen and phosphorus removal.

Since the A/O process was developed, it has received more and more attention because of its unique economic and technical advantages and environmental benefits. The A/O process connects the anoxic section in the front section and the aerobic section in the back section in series. In the anoxic section, heterotrophic bacteria hydrolyze suspended pollutants such as starch, fiber, carbohydrates and soluble organic matter in the sewage into organic acids, decompose macromolecular organic matter into small molecule organic matter, and convert insoluble organic matter into soluble organic matter. When the products of anoxic hydrolysis enter the aerobic zone for aerobic treatment, the biodegradability of sewage and the efficiency of oxygen can be improved; in the anoxic zone, heterotrophic bacteria ammoniate pollutants such as proteins and fats (organic chains) N or the amino group in amino acids) frees ammonia (NH3, NH4+). Under sufficient oxygen supply conditions, the nitrification of autotrophic bacteria oxidizes NH3-N (NH4+) into NO3-, which is returned to area A through reflux control. Under anoxic conditions, the denitrification effect of heterophilic bacteria reduces NO3- to molecular nitrogen (N2) to complete the ecological cycle of C, N, and O and achieve harmless treatment of sewage. The A/O process can not only achieve a relatively satisfactory denitrification effect, but also achieve high COD and BOD removal rates through the above-mentioned anoxic-aerobic cycle operation. At the same time, segmented water inflow technology is used to distribute raw sewage into the biological zone to form an alternating multi-level anoxic/aerobic environment, which can also enhance the biological phosphorus and denitrification effect. An anaerobic zone is set up in the first section of the biological zone to create a good The anaerobic dilute phosphorus environment effectively ensures the removal of total phosphorus in sewage.

The multi-stage A/O process has the characteristics of simple pretreatment and sludge treatment, good and stable effects, low investment, high aeration system efficiency, and simple maintenance and management. It is suitable for small and medium-sized scales, low groundwater levels, and soil conditions suitable for soil production. In the case of zone structure, it is also found that there are certain limitations in the design. For example, the raw sewage tank, anaerobic zone, aerobic zone and sedimentation zone are generally arranged in sequence from front to back, and most of the treatment zones are arranged in sequence. Electric pumps are needed to transport sewage or sludge, which requires a large area and investment.

Rural sewage has the characteristics of small sewage volume, large amounts of organic matter, nitrogen, phosphorus and other inorganic salts in the sewage. The water quality is very unstable and the water volume changes greatly day and night. The current multi-stage A/O sewage treatment system is used to treat rural sewage. , there are problems such as large floor space and high investment costs.

The multi-stage AO process is suitable for treating sewage with high sludge concentration. The carbon source can be fully utilized and has strong impact load resistance. However, the current multi-stage AO used for sewage treatment is generally used in actual projects due to limitations in floor space and cost. 2 to 4 levels, but the relationship between denitrification efficiency and level:

η＝[1-(1/n)×1/(1+R)]×100%

(Among them, eta - the total nitrogen removal rate of nitrogen, %; n - the number of A/O reactor stages, level; R - the sludge return ratio of the first-stage anoxic zone, %.),

It can be seen that the more reactor stages, the higher the denitrification efficiency. Therefore, how to make the reactor process through circulation so that the multi-stage AO process approaches infinite-level AO while occupying a small area, and solve the contradiction between the number of multi-stage AO stages, floor space and cost in the existing technology, It is a problem that needs to be solved in rural sewage treatment.

Contents of the invention

The purpose of the present invention is to provide an (AO) ² -precipitation integrated multi-stage circulation reactor in view of the above-mentioned existing problems and deficiencies, which effectively solves the problems of the number of stages and floor space of multi-stage AO in the prior art. The contradiction between cost is that this reactor occupies a small area, has low investment, and is suitable for treating sewage with high sludge concentration.

In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

An (AO) ² - precipitation integrated multi-stage circulation reactor, including a shell, a water inlet pipe and a lifting device. The anaerobic zone, the first aerobic zone and the facultative aerobic zone are cyclically connected through partitions in the shell. zone, a second aerobic zone, and a sedimentation zone. The anaerobic zone is located in the middle and lower part of the shell. The first aerobic zone, facultative aerobic zone, second aerobic zone, and sedimentation zone are located in the shell. The upper part is arranged sequentially from the inside to the outside. The sewage flows in the first aerobic zone, the facultative zone, the second aerobic zone, the sedimentation zone, and the anaerobic zone in sequence depending on the water level difference. The clean water in the sedimentation zone It overflows from the outside of its upper part, and part of the sludge in the sedimentation zone is discharged through the sludge discharge pipe; the water inlet pipe supplies sewage to the anaerobic zone and the aerobic zone in proportion; the lifting device is used to lift the sewage in the anaerobic zone to The first aerobic zone.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the partition includes a horizontal partition and a number of annular partitions arranged on the upper part of the horizontal partition, and the sewage in the first aerobic zone passes through it The upper channel between it and the aerobic zone overflows into the aerobic zone, and the sewage in the aerobic zone flows into the second aerobic zone through the bottom channel between it and the second aerobic zone, so The sewage in the second aerobic zone flows into the sedimentation zone through the perforated flower wall between it and the upper part of the sedimentation zone, and part of the sewage in the sedimentation zone flows into the anaerobic zone through the gap between its bottom and the anaerobic zone. district.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the lifting device is a plurality of jet aerators, and the jet aerators are arranged between the first aerobic zone and the anaerobic zone. on the partition between the rooms.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the jet aerator includes a suction chamber, a vibration chamber and a diffusion tube connected in sequence from bottom to top, and the upper end outlet of the diffusion tube is connected to the third An aerobic zone is connected, and the lower end face of the suction chamber is provided with an air inlet and a water suction hole. The air inlet is connected to the main air duct introduced into the anaerobic zone from outside the shell through a first air duct. The main air duct is connected to the anaerobic zone. The air pipe is connected to the blower, and the water absorption hole is connected to the anaerobic zone.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, a plurality of aeration heads are provided in the second aerobic zone, and the plurality of aeration heads pass through the second air pipe and the main air pipe connect.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the water inlet pipe is connected in parallel with a water inlet valve one and a water inlet valve two, and the water inlet valve one is used to adjust the flow rate to the anaerobic The water supply volume to the aerobic zone, the water inlet valve 2 is used to adjust the water supply volume to the aerobic zone.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, it also includes a linkage agitator. The linkage agitator includes a stirring shaft drive device, an upper section of the stirring shaft, a scraper plate, a second gearbox, and a lower section of the stirring shaft. , stirring paddle one and stirring paddle two, the stirring shaft driving device drives the upper section of the stirring shaft to rotate, the scraping plate is connected to the upper section of the stirring shaft through a truss, and the scraping plate is arranged on the surface of the settling area ; The lower section of the stirring shaft is connected to the upper section of the stirring shaft through the gearbox two, the stirring blade one and the stirring blade two are both connected to the lower section of the stirring shaft, and the stirring blade one is arranged in the anaerobic zone , the second stirring paddle is arranged in the aerobic zone.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the stirring shaft driving device includes a motor and a gearbox, the motor is connected to the gearbox, and the gearbox is connected to the stirring shaft. The upper section is connected, and the upper section of the stirring shaft and the lower section of the stirring shaft are coaxially arranged.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the upper circumferential side of the sedimentation zone is provided with a water outlet weir, and the lower part of the sedimentation zone is provided with a mud discharge pipe, and the mud discharge pipe There is a mud drain valve connected to the top.

According to the (AO) ² - precipitation integrated multi-stage circulation reactor, the lower part of the shell is set in an inverted frustum shape, and the first aerobic zone, facultative aerobic zone and second aerobic zone are located in the In the upper part of the anaerobic zone, the sedimentation zone is located on the inverted frustum-shaped side wall of the housing, and the inclination angle of the inverted frustum-shaped side wall of the housing is set to 45°-60°.

The beneficial effects of the (AO) ² - precipitation integrated multi-stage circulation reactor of the present invention:

1. The (AO) ² -sedimentation integrated multi-stage circulation reactor of the present invention circulates sewage in multiple partitions of a shell, making the multi-stage AO process approach infinity while occupying a small area. level AO, which effectively solves the contradiction between the number of levels, floor space, and cost of multi-level AO in the existing technology. In addition, the sewage is circulated through the two AOs and the sedimentation area, which can reduce the backflow of sewage from the sedimentation area to the anaerobic area. The power of the oxygen zone eliminates the need for sludge and digestate return pumps and reduces the floor space;

2. The present invention is mainly aimed at rural sewage treatment, because rural sewage has the characteristics of small sewage volume, large amounts of organic matter and inorganic salts such as nitrogen and phosphorus in the sewage, very unstable water quality, and large changes in water volume day and night, and this reaction The water treatment capacity of the device is small, and it is suitable for treating sewage with high sludge concentration. The carbon source can be fully utilized and has strong impact load resistance;

3. In the (AO) ² - precipitation integrated multi-stage circulation reactor of the present invention, the entire reaction process only needs to be upgraded once, that is, the sewage in the anaerobic zone enters the first aerobic zone through the jet aerator, and the remaining cycles do not need to be carried out Improve, save energy, facilitate installation, save space, and reduce installation energy and labor costs;

4. The jet aerator in the present invention is installed on the partition between the anaerobic zone and the second aerobic zone. It is not only simple to install and easy to operate, but also has a compact structure, takes up little area, saves costs, and has high processing efficiency. , has the advantage of low operating costs. Since there is a blower connected to the air pipe outside the device, the aeration effect is good and the aeration efficiency is high. The sewage is pressed out from below and fully mixed. The oxygen absorption rate is high and the power efficiency is high. Compared with the traditional The aeration treatment efficiency is 1-2 times higher, and the aeration time can be significantly shortened;

5. The combined stirrer in the present invention is driven by a motor in two stages, respectively, to drive the upper section of the stirring shaft and the lower section of the stirring shaft, which are coaxially arranged. The upper section of the stirring shaft drives the scraper plate to rotate and scrape the slag, and the lower section of the stirring shaft drives the stirring paddle one and one. The rotating stirring paddle of the second stirring paddle can adapt to the different speed requirements of the scraper plate and the stirring paddles one and two. It can save power, facilitate installation, and save installation space. In addition, the stirring paddle and the scraping plate rotate at the same time, which can synchronously stir and mix. Scraping for easy operation;

6. The lower part of the shell is set in an inverted frustum shape. The sedimentation area is located on the inverted frustum-shaped side wall of the shell. The inclination angle of the inverted frustum-shaped side wall of the shell is set to 45°-60° to facilitate the removal of residual sewage and sludge. Reflux.

Description of the drawings

Figure 1 is a schematic structural diagram of an (AO) ² - precipitation integrated multi-stage circulation reactor according to an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a jet aerator according to an embodiment of the present invention.

Figure 3 is a schematic structural diagram of a linkage stirrer according to an embodiment of the present invention.

Figure 4 is a schematic structural diagram of a (AO) ² -precipitation integrated multi-stage circulation reactor without a linkage stirrer according to an embodiment of the present invention.

In the figure: I-anaerobic zone, II-first aerobic zone, III-aerobic zone, IV-second aerobic zone, V-sedimentation zone, 1-water inlet pipe, 2-water inlet valve one, 3- Water inlet valve two, 4-main air pipe, 41-first air pipe, 42-second air pipe, 5-stirring paddle one, 6-jet aerator, 61-water inlet, 62-suction chamber, 63 - Vibration chamber, 64-diffusion tube, 65-air inlet, 7-stirring paddle two, 8-aeration head, 9-sludge discharge pipe, 10-sludge discharge valve, 11-outlet weir, 12-truss, 13-scraper Slag board, 14-upper section of stirring shaft, 15-motor, 16-gearbox one, 17-gearbox two, 18-casing, 19-blower, 20-perforated flower wall, 21-lower section of stirring shaft.

Detailed ways

The (AO) ² -precipitation integrated multi-stage circulation reactor of the present invention will be described in more detail below with reference to the accompanying drawings and through specific embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship indicated by "outside" and so on is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation. Specific orientations of construction and operation are therefore not to be construed as limitations of the invention.

Referring to Figures 1 and 4, a (AO) ² - precipitation integrated multi-stage circulation reactor of this embodiment includes a shell 18, a water inlet pipe 1 and a lifting device. The circulation connection is isolated in the shell 18 through a partition Anaerobic zone I, first aerobic zone II, facultative zone III, second aerobic zone IV, sedimentation zone V, the partitions include horizontal partitions and several annular partitions arranged on the upper part of the horizontal partitions, anaerobic Zone I is located in the middle and lower part of the shell 18. The first aerobic zone II, the facultative zone III, the second aerobic zone IV, and the sedimentation zone V are arranged in sequence from the inside to the outside in the upper part of the shell 18. The sewage is in the first zone in sequence. The aerobic zone II, the facultative aerobic zone III, the second aerobic zone IV, the sedimentation zone V, and the anaerobic zone I flow without power depending on the water level difference. In this embodiment, specifically, the sewage from the first aerobic zone II passes through it. The upper channel between it and the aerobic zone III overflows into the aerobic zone III. The sewage in the aerobic zone III flows into the second aerobic zone IV through the bottom channel between it and the second aerobic zone IV. The second aerobic zone IV The sewage in area IV flows into the sedimentation area Ⅴ through the perforated flower wall 20 between it and the upper part of the sedimentation area Ⅴ. The sewage flowing into the sedimentation area Ⅴ through the perforated flower wall 20 can minimize the disturbance to the sewage in the sedimentation area Ⅴ and facilitate the flow of water in the sedimentation area Ⅴ. The sludge settles, and part of the sewage in the sedimentation zone V flows back to the anaerobic zone I through the gap between the bottom and the anaerobic zone I. The clean water in the sedimentation zone V overflows from the upper outside, and part of the sludge in the sedimentation zone V is discharged. The mud pipe 9 is discharged; the water inlet pipe 1 supplies sewage to the anaerobic zone I and the aerobic zone III in proportion; the lifting device is used to lift the sewage in the anaerobic zone I to the first aerobic zone II, and the entire circulating reactor only Once lifted, the sewage enters the anaerobic zone I under the action of water level difference. The air is powered by the blower 19 and enters the jet aerator 6. After mixing with the sewage in the anaerobic zone I, it enters the first aerobic zone II. The entire cycle process There is only one lift, which saves energy, facilitates installation, saves space, and reduces installation energy and labor costs.

In this embodiment, preferably, the lifting device is a plurality of jet aerators 6. The jet aerators 6 are arranged on the partition between the first aerobic zone II and the anaerobic zone I. They are not only simple to install, but also convenient to operate. , and has a compact structure, basically does not occupy an area, and has the advantages of saving costs, high treatment efficiency, and low operating costs; the aeration jet 6 is used between the anaerobic zone I and the second aerobic zone II, and is a good example in sewage treatment. The oxygen supply device for aerobic bacteria has good oxygenation effect.

Specifically, a possible implementation of the jet aerator 6 in this embodiment is: the jet aerator 6 includes a suction chamber 62, a oscillation chamber 63 and a diffusion tube 64 connected in sequence from bottom to top. The diffusion tube 64 The upper end outlet of the suction chamber 62 is connected to the first aerobic zone II. The lower end face of the suction chamber 62 is provided with an air inlet 65 and a water suction hole 61. The air inlet 65 is introduced into the anaerobic zone I from outside the shell 18 through the first air duct 41. The main air duct 4 is connected, the main air duct 4 is connected to the blower 19, the blower 19 is set outside the casing 18, and the water suction hole 61 is connected to the anaerobic zone I; the jet aerator 6 in this embodiment is a traditional aerator The air jet 6 is modified so that the air inlet 65 and the water suction hole 61 are located on the same side. Considering the backflow ratio of the device, 2-4 water suction holes 61 are set up at the same time. After the air and water are mixed, they are sprayed out through the upper diffuser 64 into the third Two aerobic zones IV. At the same time, there is no submersible pump, and the blower 19 is used to push the air up, forming a negative pressure in the suction chamber 62, and the water is pressed into the suction chamber 62. After the air and water are mixed in the oscillation chamber 63, the mixture is sprayed out from the diffusion tube 64 liquid; since the blower 19 is connected to the outside of the device, the aeration efficiency is high, the sewage is pressed out from below and fully mixed, the oxygen absorption rate is high, and the power efficiency is high. It is 1-2 times more efficient than traditional aeration treatment, and the aeration time can be significantly shortened.

In this embodiment, preferably, a plurality of aeration heads 8 are provided in the second aerobic zone IV. The plurality of aeration heads 8 are connected to the main air pipe 4 through the second air pipe. The jet aerator 6 shares a main air duct 4, and the installation and arrangement are convenient and simplified, which reduces the space occupied by the duct arrangement in the housing 18.

In this embodiment, preferably, the water inlet pipe 1 is connected with a water inlet valve 1 2 and a water inlet valve 2 3 in parallel. The water inlet valve 2 is used to adjust the water supply to the anaerobic zone I, and the water inlet valve 2 3 is used to adjust the water supply to the anaerobic zone I. To adjust the water supply to the aerobic zone III, the openings of the water inlet valve one 2 and the water inlet valve two 3 can be adjusted according to the specific conditions.

In this embodiment, preferably, the (AO) ² -precipitation integrated multi-stage circulation reactor of this embodiment also includes a linkage agitator, and the linkage agitator includes a stirring shaft driving device, the upper section 14 of the stirring shaft, and a scraper plate. 13. Gearbox 2 17, lower stirring shaft section 21, stirring paddle 1 5 and stirring paddle 2 7. The stirring shaft driving device drives the upper section 14 of the stirring shaft to rotate. The scraper plate 13 is connected to the upper section 14 of the stirring shaft through the truss. The scraper plate 13 Set on the surface of sedimentation zone V; the lower section 21 of the stirring shaft is connected to the upper section 14 of the stirring shaft through the gearbox 2 17, the stirring paddle 1 5 and the stirring paddle 2 7 are both connected to the lower section 21 of the stirring shaft, and the stirring paddle 1 5 is arranged in the anaerobic zone I Inside, the stirring paddle 2 7 is set in the facultative zone III. The stirring paddle 2 7 is connected to the lower section 21 of the stirring shaft through a horizontal connecting frame. The horizontal connecting frame passes through the upper channel between the first aerobic zone II and the facultative zone III. , so that stirring can be carried out in the annular area in the aerobic zone III without interfering with the side walls of the aerobic zone III.

On the basis of the above solution, more preferably, the stirring shaft driving device includes a motor 15 and a gearbox 16. The motor 15 is connected to the gearbox 16, the gearbox 16 is connected to the upper section 14 of the stirring shaft, and the upper section 14 of the stirring shaft is connected to the stirring shaft. The lower section 21 of the shaft is arranged coaxially; that is, when the motor 15 is running, it can drive the upper section 14 of the stirring shaft and the lower section 21 of the stirring shaft to rotate at the same time, so that the stirring paddle 15, the stirring paddle 27 and the scraper 13 rotate synchronously, and through the gearbox 1 16 and the transmission of gearbox two 17 to adjust the speed of the scraper plate 13 and the stirring paddles one 5 and two 7 to meet the different speed requirements of the scraper plate 13 and the stirring paddles one 5 and two 7. A motor 15 drives the upper section 14 of the stirring shaft and the lower section 21 of the stirring shaft to rotate at the same time, which can save electricity, facilitate installation, and save space at the same time; secondly, the stirring paddle 1 5, the stirring paddle 2 7 and the scraper 13 rotate at the same time, allowing synchronous mixing. With scraper, easy to operate.

In this embodiment, preferably, the upper circumferential side 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 discharge pipe 9, and the mud discharge pipe 9 is connected to a mud discharge valve 10; the sedimentation zone V The clean water enters the peripheral outlet weir 9 and flows out, and the remaining sludge is discharged through the sludge discharge pipe 7. The circulating sewage and return sludge flow back to the anaerobic zone I due to the power provided by the blower 19. It should be noted here that the lower part of the shell 18 It is arranged in an inverted frustum shape. The first aerobic zone II, the facultative zone III and the second aerobic zone IV are located in the upper part of the anaerobic zone I. The sedimentation zone V is located on the inverted frustum-shaped side wall of the shell 18. The shell 18 A certain gap is set between the inner horizontal partition and the inverted frustum-shaped side wall of the shell 18 to leave a gap between the sedimentation zone V and the anaerobic zone I. The inclination angle of the inverted frustum-shaped side wall of the shell 18 is set to 45°. -60°, that is, the bottom inclination angle of sedimentation zone V is 45°-60°, which facilitates the return of residual sewage and sludge.

In this embodiment, according to the water quality characteristics of the production wastewater obtained from the sewage plant, relevant analysis data statistics of wastewater from similar industries, and relevant water quality reports, the water quality of the test wastewater of the present invention is as shown in the following table:

During the test, part of the raw sewage enters the anaerobic zone I from the water inlet pipe 1 through the water inlet valve 2, where it undergoes denitrification, reducing NOx- to molecular nitrogen N2, and simultaneously releases phosphorus; the other part passes through the water inlet valve 23 enters the facultative oxygen zone III to supplement the carbon source. The sewage in the anaerobic zone I is stirred by the stirring slurry 5 and sent to the first aerobic zone II by the jet aerator 6. In the first aerobic zone II, autotrophic bacteria perform nitrification, oxidizing NH3-N (NH4+) to NOx-, and phosphate-accumulating bacteria absorb phosphorus; then the sewage passes through the gap between the first aerobic zone II and the facultative zone III. The upper channel enters the facultative aerobic zone III to start denitrification; the reacted sewage enters the second aerobic zone IV from the lower channel between the facultative aerobic zone III and the second aerobic zone and is aerated by the aeration head 8, where nitrification occurs. function, while further absorbing phosphorus; then the sewage enters the sedimentation zone V through the perforated flower wall 20 between the second aerobic zone IV and the upper part of the sedimentation zone V for sedimentation, part of the clean water is drained from the outlet weir 11, and part of the sludge in the sedimentation zone V is discharged The mud pipe 9 is discharged, and the other part flows back to the anaerobic zone I with the mixed liquid for the next cycle, so the device can approach infinite cycle AO treatment.

The inlet flow of sewage into the anaerobic zone I and the aerobic zone III is controlled by the water inlet valve 1 2 and the water inlet valve 2 3 as needed; the sludge return ratio is 100%; during the reaction, the first aerobic zone II and the second The DO in the aerobic zone IV is controlled at about 2.0 mg/L, and the DO in the anaerobic zone I and facultative zone III is controlled below 0.5 mg/L, so that the anaerobic zone I, the facultative zone III, the first aerobic zone II, and the second best The activated sludge in oxygen zone IV undergoes denitrification and nitrification reactions under more suitable conditions.

Tests have confirmed that when the incoming water COD is 354 mg/L, the average effluent COD is 30 mg/L, and the average COD removal rate is 91.53%, meeting the Class A standard for urban sewage discharge. When the average NH4+-N in the incoming water is 75.68mg/L, and the average NH4+-N in the effluent is 4.38mg/L, the average NH4+-N removal rate is 94.21%. According to the average TN inlet and outlet water of 78.46mg/L and 13.52mg/L, the removal rate is 82.77%.

The COD removal rate of this denitrification and phosphorus removal device reaches more than 90%, and the NH4+-N removal rate is more than 90%. The TN removal rate increases from the original 60% to 80% or even 90%. The system has achieved good denitrification effects. The ammonia nitrogen value of the outlet water is at least 1mg/L; the phosphorus value of the effluent is about 0.5mg/L, and the removal rate reaches about 60-70%; the DO value of the effluent in the sewage treatment area is not less than 0.5mg/L.

In addition, in this embodiment, the meanings of COD, DO, TN, and TP are as follows:

COD (Chemical Oxygen Demand): is the abbreviation of Chemical Oxygen Demand. It is the amount of oxidant consumed when a certain strong oxidant is used to treat water samples under certain conditions. It is an indicator of the amount of reducing substances in water.

DO (dissolved oxygen): the abbreviation of Dissolved Oxygen, refers to the molecular oxygen dissolved in water, which is called dissolved oxygen, expressed in milligrams of oxygen per liter of water.

TN (Total Nitrogen): The abbreviation of Total Nitrogen refers to the total amount of various forms of inorganic and organic nitrogen in water. Including inorganic nitrogen such as NO3-, NO2- and NH4+ and organic nitrogen such as protein, amino acids and organic amines, calculated in milligrams of nitrogen per liter of water.

TP (total phosphorus): The abbreviation of Total Phosphorus refers to the measurement result after the water sample is digested and various forms of phosphorus are converted into orthophosphate. It is measured in milligrams of phosphorus per liter of water sample.

Unless otherwise defined, technical or scientific terms used herein shall have their ordinary meaning understood by a person of ordinary skill in the art to which this invention belongs. The use of "first", "second" and similar words in the description and claims of this application does not indicate any order, quantity or importance, but is only used to distinguish different components. Likewise, the use of "a" or "one" or similar words does not necessarily imply a quantitative limitation. Words such as "include" or "include" mean that the elements or things appearing before the word include the elements or things listed after the word and their equivalents, without excluding other elements or things. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to express relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

The exemplary embodiments of the present invention are described in detail above with reference to the preferred embodiments. However, those skilled in the art will understand that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present invention. modifications, and various combinations of the technical features and structures proposed in the present invention can be carried out without exceeding the scope of protection of the present invention.

Claims (7)

1. An (AO) 2-precipitation integrated multi-stage circulation reactor, which is characterized in that it includes: A casing in which a cyclically connected anaerobic zone, a first aerobic zone, a facultative zone, a second aerobic zone and a sedimentation zone are isolated through partitions. The anaerobic zone is located in the middle of the casing. In the lower part, the first aerobic zone, the facultative zone, the second aerobic zone, and the sedimentation zone are arranged in sequence from the inside to the outside of the upper part of the shell. The sewage is sequentially located in the first aerobic zone, the facultative zone, and the sedimentation zone. The second aerobic zone, the sedimentation zone, and the anaerobic zone rely on water level differences to flow without power. The clean water in the sedimentation zone overflows from the upper outer side, and part of the sludge in the sedimentation zone is discharged through the sludge discharge pipe; A water inlet pipe that supplies sewage in proportion to the anaerobic zone and the aerobic zone; and a lifting device for lifting sewage in the anaerobic zone to the first aerobic zone; The partition includes a horizontal partition and a number of annular partitions arranged on the upper part of the horizontal partition. The sewage in the first aerobic zone overflows into the aerobic zone through the upper channel between it and the aerobic zone. The sewage in the aerobic zone flows into the second aerobic zone through the bottom channel between it and the second aerobic zone, and the sewage in the second aerobic zone passes between it and the upper part of the sedimentation zone. The perforated flower wall flows into the sedimentation zone, and part of the sewage in the sedimentation zone flows into the anaerobic zone through the gap between its bottom and the anaerobic zone; The lifting device is a plurality of jet aerators, and the jet aerators are arranged on the partition between the first aerobic zone and the anaerobic zone; The jet aerator includes a suction chamber, a vibration chamber and a diffusion tube connected in sequence from bottom to top. The upper outlet of the diffusion tube is connected to the first aerobic zone. The lower end of the suction chamber is provided with an air inlet. and a water suction hole. The air inlet is connected to the main air duct introduced into the anaerobic zone from outside the casing through the first air duct. The main air duct is connected to the blower. The water suction hole is connected to the anaerobic zone. 2. The (AO) 2-sedimentation integrated multi-stage circulation reactor according to claim 1, characterized in that a plurality of aeration heads are provided in the second aerobic zone, and a plurality of aeration heads are provided in the second aerobic zone. Connected to the main air duct via a secondary air duct. 3. The (AO) 2-sedimentation integrated multi-stage circulation reactor according to claim 1, characterized in that the water inlet pipe is connected with a water inlet valve one and a water inlet valve two in parallel, and the water inlet valve One is used to adjust the water supply to the anaerobic zone, and the second water inlet valve is used to adjust the water supply to the aerobic zone. 4. (AO) 2 - precipitation integrated multi-stage circulation reactor according to claim 1, characterized in that it also includes a linkage agitator, and the linkage agitator includes a stirring shaft drive device, an upper section of the stirring shaft, and a slag scraper. Plate, gearbox two, lower section of stirring shaft, stirring paddle one and stirring paddle two, the stirring shaft driving device drives the upper section of the stirring shaft to rotate, the scraper plate is connected to the upper section of the stirring shaft through a truss, and the scraper The slag plate is arranged on the surface of the sedimentation area; the lower section of the stirring shaft is connected to the upper section of the stirring shaft through the gearbox 2, and the stirring blades 1 and 2 are both connected to the lower section of the stirring shaft. The first paddle is arranged in the anaerobic zone, and the second stirring paddle is arranged in the aerobic zone. 5. (AO) 2 - precipitation integrated multi-stage circulation reactor according to claim 4, characterized in that the stirring shaft driving device includes a motor and a gearbox, the motor is connected to the gearbox, so The first gearbox is connected to 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. 6. The (AO) 2-sedimentation integrated multi-stage circulation reactor according to claim 1, characterized in that a water outlet weir is provided on the upper circumferential side of the sedimentation zone, and the mud discharge pipe extends from the shell The outside extends into the lower part of the sedimentation area, and the mud discharge pipe is connected with a mud discharge valve. 7. The (AO)2-sedimentation integrated multi-stage circulation reactor according to claim 1, characterized in that the lower part of the shell is set in an inverted frustum shape, and the first aerobic zone and the facultative aerobic zone , the second aerobic zone is located in the upper part of the anaerobic zone, the sedimentation zone is located on the inverted frustum-shaped side wall of the housing, and the inclination angle of the inverted frustum-shaped side wall of the housing is set to 45°-60 °.