CN112979067B - AAO treatment method and device with adjustable hydraulic retention time of biological reaction subarea - Google Patents

AAO treatment method and device with adjustable hydraulic retention time of biological reaction subarea Download PDF

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Publication number
CN112979067B
CN112979067B CN202110179611.7A CN202110179611A CN112979067B CN 112979067 B CN112979067 B CN 112979067B CN 202110179611 A CN202110179611 A CN 202110179611A CN 112979067 B CN112979067 B CN 112979067B
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aeration
pipe
branch
reflux
sludge
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CN112979067A (en
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邓小飞
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Shaanxi Xingzhuo Construction Engineering Co ltd
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Shaanxi Xingzhuo Construction Engineering Co ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/02—Fluid flow conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses an AAO treatment method and device with adjustable hydraulic retention time in biological reaction subareas, sewage enters from the bottom of a reactor main body, reflux ports and aeration holes with different heights or adjustable heights are arranged in the reactor main body, an opened aerator is positioned above the opened reflux ports, an anaerobic section is formed between a sewage water inlet and the opened reflux ports, an anoxic section is formed between the opened reflux ports and the opened aerator, an aerobic section is formed between the opened aerator and top effluent, the retention time of the aerobic section is controlled by adjusting the height of the opened aerator, the retention time of the anoxic section is controlled by adjusting the relative positions of the opened reflux ports and the opened aerator, and the retention time of the anaerobic section is controlled by adjusting the height of the opened reflux ports. The invention can realize flexible adjustment of hydraulic retention time of different reaction subareas, and can realize standard treatment of the treatment device under different conditions of sewage water quality characteristics by combining with control of dissolved oxygen concentration of the reaction subareas.

Description

AAO treatment method and device with adjustable hydraulic retention time of biological reaction subarea
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an AAO treatment method and device with adjustable hydraulic retention time in biological reaction subareas.
Background
In partial areas (such as rural areas), sewage discharge is relatively dispersed, and sewage in some areas is mainly domestic sewage such as washing, bathing and the like, and most of human excrement and urine are used for returning to fields. The sewage in some areas also comprises domestic sewage in toilets. The nitrogen and phosphorus content of the sewage without the excrement is low; the phosphorus-nitrogen content of fecal sewage is particularly high. The quality of domestic sewage is unstable, and the quality of water in different time periods also has the characteristic of difference.
Meanwhile, aiming at the existing small-scale sewage treatment station or integrated sewage treatment equipment, the design and construction are finished according to the standardized and modularized thought without water quality condition and process characteristics, and little adjustment space is left once the processing is finished. The equipment cannot achieve the treatment effect, and a large amount of resources are wasted. Because of the complexity of sewage quality, the comparison of different treatment areas must be optimally adjusted on the sewage treatment system site to achieve a good treatment effect, but the prior art is difficult to realize.
Disclosure of Invention
In order to overcome the problems of the treatment technology in the treatment of domestic sewage in a part of areas (such as rural areas) and the current situation that the adjustment flexibility of a treatment device for standardized and large-scale production is poor, the invention aims to provide an AAO treatment method and device with adjustable hydraulic retention time in a biological reaction zone, and aims to realize the standardization of stable standard-reaching treatment under the condition of variable water quality characteristics of sewage.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the AAO treatment device comprises a reactor main body, a stripping pipe, an aeration pipe, a nitrifying liquid return pipe and a sedimentation tank, wherein a plurality of return ports are formed in the reactor main body at intervals along the height direction, a valve is arranged on each return port, the nitrifying liquid return pipe comprises a first branch, a second branch and a third branch, the lower end of the first branch extends into the reactor main body from the top of the reactor main body, the position of the first branch along the height direction is adjustable, the lower end of the second branch is respectively connected with all the return ports, and the upper end of the second branch and the upper end of the first branch are both communicated with the lower end of the third branch; the air outlet end of the stripping pipe extends into the first branch from the lower end extending into the first branch; the gas outlet end of the aeration pipe extends into the reactor main body, the gas outlet end of the aeration pipe is provided with an aeration hole, and the position of the aeration pipe along the up-down direction is adjustable; or a plurality of aeration holes are arranged on the reactor main body at intervals along the height direction, the air outlet ends of the aeration pipes are respectively connected with all the aeration holes, and each aeration hole is correspondingly provided with a valve; the upper end of the reactor main body is provided with a first overflow weir and a first water collecting tank for containing overflow liquid of the first overflow weir, the first water collecting tank is provided with a first water outlet, and the first water outlet is connected to the sedimentation tank; the bottom of the reactor main body is provided with a water inlet and a sludge port.
Preferably, the device further comprises a blower, wherein air inlets of the stripping pipe and the aeration pipe are connected with the blower, and air flow meters are arranged on the stripping pipe and the aeration pipe.
Preferably, the water inlet is positioned below the sludge port, the reactor main body is provided with a water distribution plate between the water inlet and the sludge port, and the water distribution plate is provided with a round hole.
Preferably, the upper end of the first branch is connected with a height adjusting mechanism for adjusting the height of the regulator.
Preferably, the sedimentation tank adopts a vertical sedimentation tank, one end of a water inlet pipe of the vertical sedimentation tank is connected with the first water outlet, the other end of the water inlet pipe penetrates through the side wall of the upper end of a central pipe of the vertical sedimentation tank and stretches into the central pipe, a port of the water inlet pipe at the end is arranged upwards, a sludge return pipe is connected to a sludge port, a sludge return pump is connected to the sludge return pipe, an outlet of a sludge pipe of the vertical sedimentation tank is communicated with the sludge return pipe, and a communication point is positioned at an inlet end of the sludge return pump.
Preferably, the upper end of the vertical sedimentation tank is provided with a first overflow weir and a second water collecting tank for containing overflow liquid of the second overflow weir, and the second water collecting tank is connected with a water outlet pipe.
The invention also provides an AAO treatment method with adjustable hydraulic retention time of the biological reaction partition, which is carried out by adopting the AAO treatment device with adjustable hydraulic retention time of the biological reaction partition, and comprises the following steps:
according to the sewage and the time required by hydraulic retention, selecting a reflux port to be used and determining the position of an aeration hole, opening valves corresponding to the reflux ports to be used, and closing valves corresponding to the rest reflux ports; the reflux port is positioned below the aeration hole, the area between the reflux port and the aeration hole for aeration is an anoxic section, the area between the reflux port and the water inlet is an anaerobic section, and the area above the aeration hole for aeration is an aerobic section;
after the position of the aeration hole is determined, when the aeration hole is arranged at the air outlet end of the aeration pipe and the position of the aeration pipe along the up-down direction is adjustable, the aeration pipe is adjusted to enable the aeration hole to be positioned at a preset position, and the height of the first branch is adjusted to enable the height of the lower end of the first branch to be higher than that of the aeration hole; when a plurality of aeration holes are arranged on the reactor main body at intervals along the height direction, the air outlet ends of the aeration pipes are respectively connected with all the aeration holes, and each aeration hole is correspondingly provided with a valve, the aeration hole to be used is selected, the valve of the aeration hole is opened, the valves corresponding to the rest aeration holes are closed, the height of the first branch is regulated, and the lower end of the first branch is higher than the aeration hole to be used;
when sewage treatment is carried out, sewage is fed into the reactor main body through the water inlet; aeration is carried out through the aeration holes; the stripping pipe charges air into the first branch, so that gas and nitrifying liquid are lifted together, and when the gas and nitrifying liquid flow from the first branch to the junction of the first branch, the second branch and the third branch, the gas is discharged from the third branch, and the nitrifying liquid enters the second branch and flows back into the reactor main body from a used backflow port;
when the liquid in the reactor main body rises to the first overflow weir, overflow occurs, the overflowed liquid enters the first water collecting tank, and the liquid in the first water collecting tank flows into the sedimentation tank from the first water outlet for treatment.
Preferably, the sedimentation tank adopts a vertical sedimentation tank, one end of a water inlet pipe of the vertical sedimentation tank is connected with the first water outlet, the other end of the water inlet pipe penetrates through the side wall of the upper end of a central pipe of the vertical sedimentation tank and stretches into the central pipe, and a port of the end of the water inlet pipe is arranged upwards; a sludge return pipe is connected to the sludge port, a sludge return pump is connected to the sludge return pipe, an outlet of a sludge pipe of the vertical sedimentation tank is communicated with the sludge return pipe, and the communication point is positioned at an inlet end of the sludge return pump;
when the vertical sedimentation tank is used for treating the flowing-in liquid, the sludge obtained by sedimentation is discharged from the sludge pipe, and part of the sludge discharged from the sludge pipe enters the reactor main body through the sludge return pipe, the sludge return pump and the sludge port for treatment.
Preferably, the reflux port to be used and the position of the aeration hole are selected according to the sewage and the time required for hydraulic retention:
when the carbon nitrogen ratio in the sewage entering from the water inlet is more than or equal to 5, a reflux port far away from the water inlet is opened; or increasing the area above the aeration holes of the air outlet; and under the condition that the carbon nitrogen ratio in the sewage entering from the water inlet is less than 5, increasing the relative section of the nitrifying liquid reflux point and the water inlet.
Preferably: when the carbon nitrogen ratio in the sewage entering from the water inlet is more than or equal to 5, the anaerobic section: anoxic section: the hydraulic retention time ratio of the aerobic section is 2:2:6; the DO of dissolved oxygen is controlled to be less than or equal to 0.2mg/L, less than or equal to 0.2mg/L and less than or equal to 0.5mg/L and less than or equal to 2mg/L and less than or equal to 3mg/L respectively; the temperature is 20.0-26.0 ℃, the pH value is 7.0-8.0, the reflux ratio of nitrifying liquid is controlled to be 150-200%, and the reflux ratio of sludge is controlled to be 50-100%;
under the condition that the carbon nitrogen ratio in sewage entering from the water inlet is less than 5, the anaerobic section: anoxic section: the hydraulic retention time ratio of the aerobic section is 2:3:5; the dissolved oxygen DO is controlled to be less than or equal to 0.2mg/L, less than or equal to 0.2mg/L and less than or equal to 0.5mg/L and 1mg/L and less than or equal to 2mg/L respectively; the temperature is 20.0-26.0 ℃, the pH value is 7.0-8.0, the reflux ratio of nitrifying liquid is controlled to be 200-300%, and the reflux ratio of sludge is controlled to be 50-100%.
Compared with the prior art, the invention has the beneficial effects that:
in the AAO treatment device with adjustable hydraulic retention time in biological reaction subareas, an anaerobic section is formed between a water inlet and an opened reflux port of nitrifying liquid, an anoxic section is formed between the opened reflux port of nitrifying liquid and an opened aeration hole, an aerobic section is formed between the opened aeration hole and effluent water at the top of a reactor main body, the retention time of the aerobic section can be controlled by adjusting the height of the opened aeration hole, the retention time of the anoxic section can be controlled by adjusting the relative positions of the reflux port of nitrifying liquid and the opened aeration hole, and the retention time of the anaerobic section can be controlled by adjusting the height of the reflux port of nitrifying liquid. Therefore, the hydraulic retention time of the anaerobic section, the anoxic section and the aerobic section can be freely regulated and controlled, so that the optimal operation condition is sought, and the treatment effect is optimized. The method can solve the problems existing in the treatment of domestic sewage in partial areas (such as rural areas) in the existing sewage treatment technology and the current situation that the adjustment flexibility of the standardized large-scale production treatment device is poor. In addition, the gas outlet end of the stripping pipe extends into the first branch from the lower end extending into the first branch, so that nitrified liquid can be refluxed by a stripping method, and a large amount of energy and nitrate consumption can be saved. The upper end of the second branch and the upper end of the first branch are communicated with the lower end of the third branch, and through the structure, gas-liquid separation of a mixture of gas and liquid in the first branch can be realized, so that nitrified liquid smoothly flows back to be reused. The setting sedimentation tank can carry out mud-water separation with the waste water after the reactor main part is handled. The sludge outlet arranged at the bottom of the reactor main body can be used for discharging sludge and sending the sludge to be treated into the reactor main body, so that the treatment effect is improved.
Furthermore, the gas flowmeter can accurately control aeration and stripping rate, so that the whole sewage treatment process can be accurately controlled.
The AAO treatment method with adjustable hydraulic retention time in biological reaction subareas can flexibly control the hydraulic retention time of an anaerobic section, an anoxic section and an aerobic section, can carry out targeted treatment on different sewage, and realizes standard treatment under different conditions of sewage water quality characteristics.
Drawings
FIG. 1 is an elevation view of the hydraulic residence time adjustable AAO treatment of a biological reaction zone of the present invention.
FIG. 2 is a front view of the reactor body of the present invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a schematic structural view of the water distribution plate of the present invention.
FIG. 5 is a schematic diagram of the aerobic section, anaerobic section, anoxic section zones of FIG. 2.
Fig. 6 is a front view of the vertical flow type settling tank of the present invention.
Fig. 7 is a top view of fig. 6.
In the figure, 1-water inlet, 2-water distribution plate, 2-1-round hole, 3-first return port, 4-second return port, 5-third return port, 6-fourth return port, 7-bottom port, 8-adjusting ring, 9-stripping pipe, 10-pipeline port, 11-aeration pipe, 12-aeration hole, 13-first water outlet, 14-water inlet pipe, 15-central pipe, 16-umbrella-shaped reflecting plate, 17-water outlet pipe, 18-sludge pipe, 19-sludge port, 20-sludge outlet, 21-blower, 22-reactor main body, 23-first water collecting tank, 24-second water collecting tank, 25-nitrifying liquid return pipe, 25-1-first bottom branch, 25-2-second bottom branch, 25-3-top branch, 26-return branch pipe, 27-sludge return pipe, 28-sludge return pump, 29-vertical sedimentation tank, 30-first overflow weir, 32-gas flowmeter, 33-valve, 34-water pump, 35-anaerobic section, 36-anoxic section, 37-aerobic section.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
According to the AAO treatment method with the adjustable hydraulic retention time in the biological reaction zone, sewage enters from the bottom of the reactor main body, and the following combination is arranged in the reactor main body:
1. the nitrifying liquid reflux ports and the aeration holes with different heights are respectively provided with an independent valve.
2. The nitrifying liquid reflux ports with different heights and the aeration holes with adjustable heights are respectively provided with an independent valve.
3. The device comprises a reflux port of the nitrifying liquid with adjustable height and aeration holes with different heights, wherein each aeration hole is provided with an independent valve.
4. A highly adjustable nitrifying liquid reflux port and a highly adjustable aeration hole.
And the following principles need to be satisfied: the opened aeration hole is positioned above the opened nitrifying liquid reflux port.
Finally, an anaerobic section is formed between the sewage water inlet and the opened nitrifying liquid reflux port, an anoxic section is formed between the opened nitrifying liquid reflux port and the opened aeration hole, and an aerobic section is formed between the opened aeration hole and top water outlet. The residence time of the aerobic section can be controlled by adjusting the height of the opened aeration hole, the residence time of the anoxic section can be controlled by adjusting the relative positions of the opened nitrifying liquid reflux port and the opened aeration hole, and the residence time of the anaerobic section can be controlled by adjusting the height of the opened nitrifying liquid reflux port.
The invention provides a feasible concrete adjustment strategy during AAO treatment: when the inflow water is high in C/N (namely, the C/N is more than or equal to 5), the hydraulic retention time of the anaerobic section is prolonged by opening a nitrifying liquid reflux port far away from the water inlet, so that organic matters are fully utilized in the anaerobic section; the area above the opened aeration holes can be properly enlarged, so that the hydraulic retention time of the aerobic section is prolonged, the removal capacity of the aerobic phosphorus is improved, and more organic matters which are easy to use are consumed; and when the inflow water is low in C/N (namely C/N is less than 5), the relative area between the reflux point of the nitrifying liquid and the sewage port is increased, so that the hydraulic retention time of the anaerobic section is prolonged, the reaction time of the anaerobic section by utilizing organic matters is increased, the retention time of the anaerobic section is increased, the TN removal rate is enhanced, and the denitrification capacity of the denitrification of the system is improved.
The volume of the aerobic section is properly increased when the C/N is high, while the volume of the anoxic section is required to be increased when the C/N is low, and the ratio of the aerobic section is reduced as much as possible, so that the requirement of ammonia nitrogen nitrification can be met.
One possible specific tuning parameter is: when the C/N is high, namely, the C/N is more than or equal to 5, the anaerobic section: anoxic section: the hydraulic retention time ratio of the aerobic section is 2:2:6; dissolved oxygen is respectively controlled to be less than or equal to 0.2mg/L, less than or equal to 0.2mg/L and less than or equal to 0.5mg/L and 2mg/L and less than or equal to DO and less than or equal to mg/L; the temperature is 20.0-26.0 ℃, the pH value is 7.0-8.0, the reflux ratio of nitrifying liquid is controlled to be 150-200%, and the reflux ratio of sludge is controlled to be 50-100%; anaerobic section when low C/N, i.e. C/N < 5: anoxic section: the hydraulic retention time ratio of the aerobic section is 2:3:5; dissolved oxygen is controlled to be less than or equal to 0.2mg/L, less than or equal to 0.2mg/L and less than or equal to 0.5mg/L and less than or equal to 1mg/L and less than or equal to 2mg/L respectively; the temperature is 20.0-26.0 ℃, the pH value is 7.0-8.0, the reflux ratio of nitrifying liquid is controlled to be 200-300%, and the reflux ratio of sludge is controlled to be 50-100%.
The invention also provides an AAO treatment device with adjustable hydraulic retention time in a biological reaction zone, which comprises a reactor main body, wherein the bottom of the reactor main body is provided with a sewage water inlet 1, the reactor main body is connected with a nitrifying liquid stripping reflux device, an aeration device is arranged in the reactor main body, a plurality of aeration holes 12 of the aeration device are respectively provided with a valve, the aeration holes 12 are positioned at different heights, or the aeration device is of a liftable structure, namely the height of the aeration holes 12 is adjustable; the nitrifying liquid stripping reflux device is provided with a plurality of reflux ports and valves respectively, wherein the reflux ports are positioned at different heights, or the nitrifying liquid stripping reflux device is of a liftable structure, namely the height of the reflux ports is adjustable; and the opened aeration hole is positioned above the opened nitrifying liquid reflux port, an anaerobic section is formed between the sewage water inlet and the opened nitrifying liquid reflux port, an anoxic section is formed between the opened nitrifying liquid reflux port and the opened aeration hole, and an aerobic section is formed between the opened aeration hole and the top water outlet.
The bottom of the reactor main body is also provided with a sludge port 19, the sludge port 19 is positioned above the sewage inlet 1, the opened nitrifying liquid reflux port is positioned below, and a uniform water distribution plate 2 is arranged between the sludge port 19 and the sewage inlet 1; the top of the reactor main body is provided with a zigzag overflow weir, a vertical flow sedimentation tank is arranged outside the reactor main body, effluent of the reactor main body enters a water inlet pipe 14 of the vertical flow sedimentation tank from a first water outlet 13 through the zigzag overflow weir, mud and water are separated in the vertical flow sedimentation tank, separated supernatant fluid is discharged from the top along a water outlet pipe 17, and part of sludge flows back into an anaerobic section of the reactor main body through a sludge port 19.
The vertical sedimentation tank is internally provided with a central tube 15, an inner tube opening of the central tube 15 is upward through a water inlet tube 14, an umbrella-shaped reflecting plate 16 is arranged below the central tube 15, mixed liquid falls from top to bottom from the central tube 15, mud and water are separated after collision through the umbrella-shaped reflecting plate 16, a sludge tube 18 is arranged at the bottom of the vertical sedimentation tank, and an overflow weir is arranged at the top.
The aeration device is of a liftable structure and mainly comprises a blower 21, an aeration pipe 11 and aeration holes 12, and the adjustability of the hydraulic retention time of the aerobic section is realized by adjusting the depth of the aeration holes 12 under the liquid level; the nitrifying liquid stripping reflux device mainly comprises a blower 21, a stripping pipe 9, an adjusting ring 8, a nitrifying liquid reflux pipe 25 and a nitrifying liquid reflux branch 26, wherein the nitrifying liquid reflux branch 26 is respectively connected to different heights of the side wall of the reactor main body and is provided with a valve 33, a plurality of reflux ports (first to fourth reflux ports) with valves are formed, the nitrifying liquid reflux pipe 25 is integrally h-shaped, a first branch, a second branch and a third branch of the nitrifying liquid reflux pipe 25 respectively correspond to a first bottom branch 25-1, a second bottom branch 25-2 and a top branch 25-3 of the h-shaped nitrifying liquid reflux pipe, the first bottom branch 25-1 of the nitrifying liquid reflux pipe is positioned in the reactor main body, the stripping pipe 9 extends into a bottom orifice 7 of the first bottom branch 25-1, an opening is inflated in the first bottom branch 25-1, gas and liquid are lifted together under a pressure difference, the top branch 25-3 and the second bottom branch 25-2 of the nitrifying liquid reflux pipe are positioned outside the reactor main body, the first bottom branch 25-1 is immersed in the top branch 25-2, the nitrifying liquid reflux pipe is always flows from the top of the first bottom branch 25-1 to the top of the reactor main body, the nitrifying liquid reflux pipe is always flows from the top side of the top branch 25-1 through the top branch 2, and the top of the nitrifying liquid reflux pipe is always kept at a certain distance from the top orifice 12, and the top of the nitrifying liquid reflux pipe is controlled to be opened.
The aeration quantity of the aeration in the first bottom branch 25-1 is regulated so that the dissolved oxygen in the anoxic section between the reflux point of the nitrified liquid and the aeration holes 12 is controlled to be 0.2-0.5 mg/L.
Examples
The AAO treatment device with adjustable hydraulic residence time in biological reaction zone in this embodiment, as shown in FIGS. 1, 2 and 3, comprises a reactor main body 22, wherein the reactor main body 22 is connected with a nitrifying liquid stripping reflux device, and an aeration device is arranged in the reactor main body 22.
Wherein, the aeration device is a liftable structure and mainly comprises a blower 21, an aeration pipe 11 and an aeration hole 12. The nitrifying liquid stripping reflux device has a plurality of reflux ports and is respectively provided with a valve, and the reflux ports are positioned at different heights. Specifically, the nitrifying liquid stripping reflux device mainly comprises a blower, a stripping pipe 9, an adjusting ring 8, an h-shaped nitrifying liquid reflux pipe and a nitrifying liquid reflux branch pipe 26. The nitrified liquid reflux branch pipe is provided with 4, is connected in the different high departments of reactor main part 22 lateral wall respectively to set up valve 33 respectively, form 4 backward flow mouths that have the valve respectively and be first backward flow mouth 3, second backward flow mouth 4, third backward flow mouth 5 and fourth backward flow mouth 6.
The first bottom branch 25-1 of the h-shaped nitrifying liquid reflux pipe is positioned in the reactor main body 22, the stripping pipe 9 extends into the bottom orifice 7 of the first bottom branch 25-1, the opening of the stripping pipe 9 is inflated upwards in the first bottom branch 25-1 (the inflated quantity: the reflux quantity is 1.2:1), the gas and nitrifying liquid are lifted together under the pressure difference, the top branch 25-3 and the second bottom branch 25-2 of the nitrifying liquid reflux pipe are positioned outside the reactor main body 22, the gas is discharged from the pipeline mouth 10 at the top end of the top branch 25-3, the nitrifying liquid flows back into the reactor main body 22 along the second bottom branch 25-2 from one or more opened reflux ports, the first bottom branch 25-1 is always controlled to be immersed above the aeration holes 12 through the adjusting ring 8, and a certain distance is reserved from the top of the reactor main body, so that the gas stripping nitrifying liquid reflux can be realized.
In the device, an aerobic section with adjustable hydraulic retention time is formed in the reactor body above the aeration holes 12, and the hydraulic retention time of the aerobic section is adjusted by the depth of the aeration holes 12 in the reactor body. The dissolved oxygen concentration of the aerobic section is controlled to be 2-3 mg/L.
The corresponding valves 33 of the first to fourth reflux ports (3 to 6) are opened and closed to change the reflux water inlet point of the nitrified liquid, and the relative area above the reflux water inlet point of the nitrified liquid and below the aeration holes 12 form an anoxic section with adjustable hydraulic retention time. The hydraulic retention time of the anoxic section is adjusted by the depth of the aeration holes 12 in the reactor body and the height of the nitrified liquid reflux inlet point. The aeration quantity of the aeration in the bottom branch is regulated, so that the dissolved oxygen in the anoxic section between the reflux point of the nitrified liquid and the aeration holes 12 is controlled to be 0.2-0.5 mg/L.
The different relative area sections between the reflux water inlet points and the water inlet 1 form an anaerobic section with adjustable hydraulic retention time. The hydraulic retention time of the anaerobic section is adjusted by the height of the reflux water inlet point of the nitrifying liquid. Specifically, the air inlet pipe 9 enters the first bottom branch 25-1 of the nitrifying liquid reflux pipe from the bottom orifice 7, the depth of the first bottom branch 25-1 in the reaction of the reactor main body is regulated by the regulating ring 8, and the lowest point of the nitrifying liquid reflux pipe is controlled to be in the aerobic section (namely above the air outlet hole 20 of the liftable aeration device). The gas enters the nitrifying liquid return pipe to be mixed with nitrifying liquid of the aerobic section, the mixed liquid is lifted along the nitrifying pipeline, and the gas is discharged from the pipeline port 10.
Specifically, the AAO body reaction zone is tunable, see fig. 5. The area between the upper part of the aeration hole 12 and the overflow weir is an aerobic section; nitrifying liquid enters the reactor main body 22 from the first reflux port 3, and the area between the upper part of the first reflux port 3 and the lower part of the aeration holes 12 is an anoxic section; the area between the upper part of the water inlet 1 and the lower part of the first reflux port 3 is an anaerobic section.
The main body of the reactor is cylindrical, the bottom of the main body is provided with a water inlet 1 and a sludge port 19, the sludge port 19 is positioned above the sewage water inlet 1, the opened nitrifying liquid reflux port is positioned below, and uniform water distribution is arranged between the sludge port 19 and the sewage water inlet 1And a plate 2. The uniform water distribution plate 2 is provided with a flat plate with uniform sizeThe round holes are uniformly arranged into concentric rings.
The top of the reactor main body 22 is provided with a zigzag overflow weir, the outside of the reactor main body 22 is provided with a vertical flow sedimentation tank 29, the structure of the flow sedimentation tank 29 is shown in fig. 6 and 7, the main body structure is cylindrical, a central pipe 15 is arranged in the main body, an inner pipe opening of the central pipe 15 is upward, an umbrella-shaped reflecting plate 16 is arranged below the central pipe 15, mixed liquid enters from the water inlet pipe 14, the central pipe 15 flows upwards from top to bottom after being collided by the umbrella-shaped reflecting plate 16 and mud and water are separated, the bottom of the vertical flow sedimentation tank is provided with a sludge pipe 18, the top is provided with an overflow weir, and sedimentation water overflows from a water outlet pipe 17 through the zigzag overflow weir at the top of the tank. The sludge is deposited to the bottom, discharged from the sludge pipe 18 under the action of hydrostatic pressure, and part of the sludge flows back into the anaerobic section of the reactor body through the sludge port 19. In order to ensure that the water flow in the sedimentation tank moves vertically from bottom to top and the water flow is distributed uniformly, the ratio of the diameter of the vertical sedimentation tank to the effective water depth (diameter-depth ratio D: h) is not easy to be larger than 3. The sedimentation area is cylindrical, and the sludge hopper is a truncated inverted cone.
Sewage sequentially flows through a uniform water distribution plate 2, an anaerobic section, an anoxic section and an aerobic section from bottom to top from a water inlet 1, after biological denitrification and dephosphorization treatment, treated water flows into a water collecting tank from a first water outlet 13 through a zigzag overflow weir at the top, enters a vertical flow sedimentation tank water inlet pipe 14, flows upwards from top to bottom in a central pipe 15 through an umbrella-shaped reflecting plate 16, separated sludge is discharged from a sludge pipe discharge port 18, a part of sludge enters an anaerobic section of an AAO reactor main body from a reflux port 19 through a reflux pump, and the sludge reflux ratio is controlled to be 100% -200%; another part of the surplus sludge is discharged from the discharge port 20 to be treated. The separated precipitated water flows from the top overflow weir into the sump and out of the discharge pipe 17. The hydraulic retention time of the anaerobic section, the anoxic section and the aerobic section of the AAO reactor main body can be flexibly regulated and controlled by lifting the relative position between the aeration device and the water inlet valve of the nitrified liquid stripping reflux pipeline.
The device can freely regulate and control the hydraulic retention time of the aerobic section, the anoxic section and the anaerobic section, seek the best operation condition and optimize the treatment effect; the limiting factors of the conditions such as water quality are low; the method can be used for large-scale production and large-batch production; the system has the advantages of simple operation and management, simple equipment maintenance and the like.
In conclusion, the AAO reactor main body can realize flexible adjustment of hydraulic retention time of different reaction zones, and standard treatment of the treatment device under different conditions of sewage water quality characteristics can be realized by combining the control of dissolved oxygen concentration of the reaction zones. The method is applicable to sewage treatment under multiple conditions, and particularly aims at treating rural domestic sewage with specificity. Can be produced in large scale and is put into use in large batches, and has low limiting factors due to conditions such as water quality and the like. The reflux of the nitrifying liquid by the stripping method can save a great deal of energy and nitrate consumption. The system is simple and convenient to operate and manage and equipment is simple to maintain.

Claims (9)

1. The AAO treatment device is characterized by comprising a reactor main body (22), a stripping pipe (9), an aeration pipe (11), a nitrifying liquid return pipe (25) and a sedimentation tank, wherein a plurality of return ports are arranged on the reactor main body (22) at intervals along the height direction, a valve (33) is arranged on each return port, the nitrifying liquid return pipe (25) comprises a first branch, a second branch and a third branch, the lower end of the first branch extends into the reactor main body (22) from the top of the reactor main body (22), the position of the first branch along the height direction is adjustable, the lower end of the second branch is respectively connected with all the return ports, and the upper ends of the second branch and the first branch are communicated with the lower end of the third branch; the air outlet end of the stripping pipe (9) extends into the first branch from the lower end of the first branch; the air outlet end of the aeration pipe (11) extends into the reactor main body (22), the air outlet end of the aeration pipe (11) is provided with an aeration hole (12), and the position of the aeration pipe (11) along the up-down direction is adjustable; or a plurality of aeration holes (12) are arranged on the reactor main body (22) at intervals along the height direction, the air outlet end of the aeration pipe (11) is respectively connected with all the aeration holes (12), and each aeration hole (12) is correspondingly provided with a valve; the upper end of the reactor main body (22) is provided with a first overflow weir (30) and a first water collecting tank (23) for containing overflow liquid of the first overflow weir (30), the first water collecting tank (23) is provided with a first water outlet (13), and the first water outlet (13) is connected to a sedimentation tank; the bottom of the reactor main body (22) is provided with a water inlet (1) and a sludge port (19);
according to the sewage and the time required by hydraulic retention, selecting a reflux port to be used and determining the position of an aeration hole (12), opening valves corresponding to the reflux ports to be used, and closing valves corresponding to the rest reflux ports; the used reflux port is positioned below the aeration hole (12), the area between the used reflux port and the aerated aeration hole (12) is an anoxic section (36), the area between the used reflux port and the water inlet (1) is an anaerobic section (35), and the area above the aerated aeration hole (12) is an aerobic section (37);
the reflux ports required to be used and the positions of the aeration holes (12) are determined according to the sewage and the time required for hydraulic retention:
when the carbon-nitrogen ratio in the sewage entering from the water inlet (1) is more than or equal to 5, a reflux port far away from the water inlet (1) is opened; or increasing the area above the aeration holes of the air outlet; and increasing the relative section of the nitrifying liquid reflux point and the water inlet (1) under the condition that the carbon nitrogen ratio in the sewage entering from the water inlet (1) is less than 5.
2. The AAO treatment device with adjustable hydraulic residence time for biological reaction subareas according to claim 1, further comprising a blower (21), wherein air inlets of the stripping tube (9) and the aeration tube (11) are connected with the blower (21), and air flow meters (32) are arranged on the stripping tube (9) and the aeration tube (11).
3. The AAO treatment device with the adjustable hydraulic retention time in the biological reaction zone according to claim 1, wherein the water inlet (1) is positioned below the sludge port (19), the reactor main body (22) is provided with a water distribution plate (2) between the water inlet (1) and the sludge port (19), and the water distribution plate (2) is provided with a round hole (2-1).
4. The apparatus of claim 1, wherein the upper end of the first branch is connected to a height adjustment mechanism for adjusting the height of the regulator.
5. The AAO treatment device with the adjustable hydraulic retention time in the biological reaction zone according to claim 1, wherein the sedimentation tank is a vertical sedimentation tank (29), one end of a water inlet pipe (14) of the vertical sedimentation tank (29) is connected with the first water outlet (13), the other end of the water inlet pipe (14) penetrates through the side wall of the upper end of a central pipe (15) of the vertical sedimentation tank (29) and stretches into the central pipe (15), a port of the end of the water inlet pipe (14) is arranged upwards, a sludge return pipe (27) is connected to a sludge port (19), a sludge return pump (28) is connected to the sludge return pipe (27), an outlet of a sludge pipe (18) of the vertical sedimentation tank (29) is communicated with the sludge return pipe (27), and a communication point is positioned at the inlet end of the sludge return pump (28).
6. The AAO treatment device with adjustable hydraulic residence time in biological reaction subareas according to claim 5, wherein a first overflow weir (31) and a second water collecting tank (24) for containing overflow liquid of the first overflow weir (31) are arranged at the upper end of the vertical sedimentation tank (29), and a water outlet pipe (17) is connected to the second water collecting tank (24).
7. A method for treating AAO with adjustable hydraulic residence time in a biological reaction zone, which is characterized in that the method is carried out by adopting the AAO treatment device with adjustable hydraulic residence time in a biological reaction zone as claimed in any one of claims 1 to 6, and comprises the following steps:
according to the sewage and the time required by hydraulic retention, selecting a reflux port to be used and determining the position of an aeration hole (12), opening valves corresponding to the reflux ports to be used, and closing valves corresponding to the rest reflux ports; the used reflux port is positioned below the aeration hole (12), the area between the used reflux port and the aerated aeration hole (12) is an anoxic section (36), the area between the used reflux port and the water inlet (1) is an anaerobic section (35), and the area above the aerated aeration hole (12) is an aerobic section (37);
after the position of the aeration hole (12) is determined, when the aeration hole (12) is arranged at the air outlet end of the aeration pipe (11) and the position of the aeration pipe (11) along the up-down direction is adjustable, the aeration pipe (11) is adjusted to enable the aeration hole (12) to be positioned at a preset position, and the height of the first branch is adjusted to enable the lower end of the first branch to be higher than the aeration hole (12); when a plurality of aeration holes (12) are formed in the reactor main body (22) at intervals along the height direction, the air outlet ends of the aeration pipes (11) are respectively connected with all the aeration holes (12), and each aeration hole (12) is correspondingly provided with a valve, the aeration hole (12) to be used is selected, the valve of the aeration hole (12) is opened, the valves corresponding to the rest aeration holes (12) are closed, the height of the first branch is regulated, and the lower end of the first branch is higher than the aeration holes (12) to be used;
when sewage treatment is carried out, sewage is fed into the reactor main body (22) through the water inlet (1); aeration is carried out through the aeration holes (12); the stripping pipe (9) charges air into the first branch, so that gas and nitrifying liquid are lifted together, and when the gas and nitrifying liquid flow from the first branch to the junction of the first branch, the second branch and the third branch, the gas is discharged from the third branch, and the nitrifying liquid enters the second branch and flows back into the reactor main body (22) from a used backflow port;
when the liquid in the reactor main body (22) rises to the first overflow weir (30) and overflows, the overflowed liquid enters the first water collecting tank (23), and the liquid in the first water collecting tank (23) flows into the sedimentation tank from the first water outlet (13) for treatment;
the reflux ports required to be used and the positions of the aeration holes (12) are determined according to the sewage and the time required for hydraulic retention:
when the carbon-nitrogen ratio in the sewage entering from the water inlet (1) is more than or equal to 5, a reflux port far away from the water inlet (1) is opened; or increasing the area above the aeration holes of the air outlet; and increasing the relative section of the nitrifying liquid reflux point and the water inlet (1) under the condition that the carbon nitrogen ratio in the sewage entering from the water inlet (1) is less than 5.
8. The AAO treatment method with adjustable hydraulic retention time in biological reaction zone according to claim 7, wherein the sedimentation tank adopts a vertical sedimentation tank (29), one end of a water inlet pipe (14) of the vertical sedimentation tank (29) is connected with the first water outlet (13), the other end of the water inlet pipe (14) passes through the side wall of the upper end of a central pipe (15) of the vertical sedimentation tank (29) and extends into the central pipe (15), and the port of the end of the water inlet pipe (14) is arranged upwards; a sludge return pipe (27) is connected to the sludge port (19), a sludge return pump (28) is connected to the sludge return pipe (27), an outlet of a sludge pipe (18) of the vertical sedimentation tank (29) is communicated with the sludge return pipe (27), and a communication point is positioned at an inlet end of the sludge return pump (28);
when the vertical sedimentation tank (29) processes the inflow liquid, the sludge obtained by sedimentation is discharged from the sludge pipe (18), and a part of the sludge discharged from the sludge pipe (18) enters the reactor main body (22) through the sludge return pipe (27), the sludge return pump (28) and the sludge port (19) for processing.
9. The method for treating AAO with adjustable hydraulic retention time in biological reaction zone according to claim 7, wherein the method comprises the following steps:
when the carbon-nitrogen ratio in the sewage entering from the water inlet (1) is more than or equal to 5, the anaerobic section: anoxic section: the hydraulic retention time ratio of the aerobic section is 2:2:6; the DO of dissolved oxygen is controlled to be less than or equal to 0.2mg/L, less than or equal to 0.2mg/L and less than or equal to 0.5mg/L and less than or equal to 2mg/L and less than or equal to 3mg/L respectively; the temperature is 20.0-26.0 ℃, the pH value is 7.0-8.0, the reflux ratio of nitrifying liquid is controlled to be 150-200%, and the reflux ratio of sludge is controlled to be 50-100%;
under the condition that the carbon-nitrogen ratio in the sewage entering from the water inlet (1) is less than 5, the anaerobic section: anoxic section: the hydraulic retention time ratio of the aerobic section is 2:3:5; the dissolved oxygen DO is controlled to be less than or equal to 0.2mg/L, less than or equal to 0.2mg/L and less than or equal to 0.5mg/L and 1mg/L and less than or equal to 2mg/L respectively; the temperature is 20.0-26.0 ℃, the pH value is 7.0-8.0, the reflux ratio of nitrifying liquid is controlled to be 200% -300%, and the reflux ratio of sludge is controlled to be 50% -100%.
CN202110179611.7A 2021-02-07 2021-02-07 AAO treatment method and device with adjustable hydraulic retention time of biological reaction subarea Active CN112979067B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106746383A (en) * 2017-03-30 2017-05-31 长春工程学院 Municipal sewage treatment reinforcing operation method and device that a kind of biochemistry pool stops between being aerated
CN111302495A (en) * 2020-03-23 2020-06-19 安徽中源锦天环境科技股份有限公司 Villages and small towns sewage treatment's deep bed multiplication MBR reactor
CN211198754U (en) * 2019-11-06 2020-08-07 众意环保科技(大连)有限公司 Integrated A2/O biochemical tower with embedded precipitation structure
US20200354247A1 (en) * 2018-12-10 2020-11-12 Beijing Drainage Group Co ., Ltd Anaerobic ammoxidation synergistic nitrogen removal process device of municipal sewage main and side streams and application method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106746383A (en) * 2017-03-30 2017-05-31 长春工程学院 Municipal sewage treatment reinforcing operation method and device that a kind of biochemistry pool stops between being aerated
US20200354247A1 (en) * 2018-12-10 2020-11-12 Beijing Drainage Group Co ., Ltd Anaerobic ammoxidation synergistic nitrogen removal process device of municipal sewage main and side streams and application method thereof
CN211198754U (en) * 2019-11-06 2020-08-07 众意环保科技(大连)有限公司 Integrated A2/O biochemical tower with embedded precipitation structure
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