CN112777742A - Integrated backflow-free A2O equipment based on fluidized bed - Google Patents
Integrated backflow-free A2O equipment based on fluidized bed Download PDFInfo
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- 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
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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
- C02F2301/00—General aspects of water treatment
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
一种基于流化床的一体化无回流A2O设备，包括厌氧区、缺氧区、好氧区及沉淀池，其特征在于：厌氧区、缺氧区及沉淀池依次设置并通过溢流口实现连通，好氧区分列于缺氧区两侧并与缺氧区及沉淀池连通，缺氧区与好氧区之间使用导流板分隔，导流板由上至下设置至少两个环流口；好氧区底部设置有曝气盘，厌氧区及缺氧区内设置有搅拌装置；沉淀池底部设置有污泥回流口及排泥口，污泥回流口与厌氧区连通，沉淀池远离缺氧区一侧侧壁顶端设置出水口。实现高效、低能耗地处理废水。
An integrated non-reflux A2O equipment based on a fluidized bed, comprising an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation tank, characterized in that: the anaerobic zone, the anoxic zone and the sedimentation tank are arranged in sequence and pass through the overflow The port is connected. The aerobic area is listed on both sides of the anoxic area and is connected to the anoxic area and the sedimentation tank. The anoxic area and the aerobic area are separated by a guide plate, and at least two guide plates are arranged from top to bottom. A circulation outlet; an aeration plate is arranged at the bottom of the aerobic zone, a stirring device is arranged in the anaerobic zone and anoxic zone; a sludge return port and a sludge discharge port are arranged at the bottom of the sedimentation tank, and the sludge return port is communicated with the anaerobic zone. A water outlet is provided at the top of the side wall of the sedimentation tank away from the anoxic zone. To achieve efficient, low-energy treatment of wastewater.
Description
Technical Field
The invention relates to a wastewater treatment device, in particular to an integrated backflow-free A2O device based on a fluidized bed.
Background
The biological fluidized bed technology combines biological immobilization technology and fluidization technology into a new sewage (waste water) treatment technology, has the advantages of high efficiency, small occupied area and investment saving, has strong adaptability to water quality, load and bed temperature change, and is widely applied to various sewage (waste water) treatment occasions. At present, the dynamic characteristics of the fluidized bed are mostly researched by software simulation, for example, Maijie et al propose that the rectification action of the cross baffle can obviously reduce the hydraulic loss caused by inelastic collision of fluid at the bottom of the fluidized bed, so that the liquid circulation speed of an ascending region and a descending region in the quadrangular fluidized bed is improved by 15.7 percent and 15.0 percent to the maximum extent. In recent years, PIV is widely used in gas-liquid two-phase flow field measurement. For example, the study of kinetics characteristics of quadrilateral bioreactors by PIV technology by Liang et al suggests that different stirring forms, filler concentrations, internal structures, aeration intensities, water inlet and outlet amounts and different fluidization forms of HRT generated in biological fluidized beds are different, and a good fluidization form is reflected in a hydraulic dead zone, the biological dead zone is small, and good hydraulic shear enables the cell membrane renewal rate to be fast, so the study of kinetics characteristics of biological fluidized beds has a crucial role in sewage treatment technology.
The A2/O process, namely the synchronous nitrogen and phosphorus removal process (see figure 6), is a common process for municipal sewage treatment plants, has the advantages of simple process composition, simple control, difficult sludge bulking generation and the like, but still has the following problems: high energy consumption, contradiction between sludge reflux, nitrification and denitrification and organic matter degradation, insufficient carbon source, short hydraulic retention time and the like. The research and research of high-efficiency and energy-saving biological nitrogen and phosphorus removal technology is a research hotspot in the field of current sewage treatment, at present, many scholars research influence factors of A2/O process nitrogen and phosphorus removal effect, Junguo He and the like discuss influence of temperature on a system starting process in comparative research of starting characteristics of a medium-low temperature A2/O process, and propose that the removal rates of COD and TP are within an acceptable range at two temperatures of 23 ℃ and 12 ℃. Niu Mingfen et al used an improved A2/O reactor to treat anaerobic fermentation pigsty sewage and studied the influence of Dissolved Oxygen (DO), Hydraulic Retention Time (HRT) and the like in the treatment system parameters on the treatment effect. Wherein, Wangjianhua proposes to increase the volume of an anoxic zone of an A2/O process and improve the denitrification dephosphorization effect of the system. Wang Cong adds the fluidization carrier to the aerobic tank of an A2/O sewage treatment plant, thereby improving the denitrification efficiency. In addition, bear Jianxin et al studied the effect of reflux mode, reflux ratio and dissolved oxygen content in the reflux digestive juice on nitrogen and phosphorus removal in A2/O process. The invention aims to realize the reduction of the energy consumption of the mixed liquid reflux system in the sewage treatment process from the optimization of external operating conditions and the innovation of the device structure.
Disclosure of Invention
In order to solve the above problems, the present invention provides the following solutions:
an integrated reflux-free A2O device based on a fluidized bed comprises an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation tank, wherein the anaerobic zone, the anoxic zone and the sedimentation tank are sequentially arranged and communicated through overflow ports; the bottom of the aerobic zone is provided with an aeration disc, and stirring devices are arranged in the anaerobic zone and the anoxic zone; the bottom of the sedimentation tank is provided with a sludge return port and a sludge discharge port, the sludge return port is communicated with the anaerobic zone, and the top end of the side wall of one side of the anoxic zone away from the sedimentation tank is provided with a water outlet.
Furthermore, the anaerobic zone is divided into two chambers by an anaerobic zone clapboard, and the bottom end of the anaerobic zone clapboard is spaced from the bottom surface of the anaerobic zone; the anoxic zone is divided into an anoxic zone I, an anoxic zone II, an anoxic zone III and an anoxic zone IV by an anoxic zone partition plate I, an anoxic zone II and an anoxic zone partition plate III, the aerobic zone is divided into an aerobic zone I, an aerobic zone II, an aerobic zone III and an aerobic zone IV by an aerobic zone partition plate I, an aerobic zone partition plate II and an aerobic zone partition plate III, the anoxic zone partition plate I, the anoxic zone partition plate III are fixed with the bottom surface of the anoxic zone, the aerobic zone partition plate I, the aerobic zone partition plate II and the bottom surface of the aerobic zone are fixed, the top end of the aerobic zone partition plate I is provided with an aerobic zone overflow port I, the anoxic zone partition plate II and the bottom surface of the anoxic zone are provided with a gap, and the bottom end of the aerobic zone partition plate III and the bottom surface of the aerobic zone are provided with a gap.
Furthermore, a stirring device is arranged in each cavity of the anaerobic zone and the aerobic zone.
Further, by being close to anoxic zone one side to keeping away from anoxic zone one side parallel arrangement have a plurality of baffles in the sedimentation tank, the baffle bottom has the interval with the sedimentation tank bottom, and the baffle is highly increased in proper order by being close to anoxic zone one side to keeping away from anoxic zone one side, and the baffle top that is closest to anoxic zone one side is less than the liquid level, and the baffle top that is furthest from anoxic zone one side is higher than the liquid level.
The sewage flows into the anaerobic zone from the water inlet and then enters the anoxic zone I from the overflow port, the sewage in the anoxic zone I enters the aerobic zone I from the circulation port, the sewage in the aerobic zone I enters the aerobic zone II from the aerobic zone overflow port I, the sewage in the aerobic zone II enters the anoxic zone II from the circulation port, the sewage in the anoxic zone II enters the anoxic zone III, the sewage in the anoxic zone III enters the aerobic zone III from the circulation port, the sewage in the aerobic zone III enters the aerobic zone IV from the bottom end of the aerobic zone partition plate III at intervals, the sewage in the aerobic zone IV enters the anoxic zone IV from the circulation port, the sewage in the anoxic zone IV enters the sedimentation tank from the anoxic zone overflow port, and meanwhile, part of the sewage in the aerobic zone IV enters the sedimentation tank from the aerobic zone overflow port II.
And sewage in the anoxic zone circularly flows through the annular flow port on the guide plate and the aerobic zone and finally flows into the sedimentation tank through the overflow port, sludge in the sedimentation tank is precipitated under the action of the baffle plate, supernatant is discharged from the water outlet, part of sludge flows back to the anaerobic zone from the bottom of the sedimentation tank through the sludge return port, and the rest of sludge is discharged from the sludge discharge port. The anaerobic zone has the main function of releasing phosphorus, meanwhile, part of organic matters are aminated, the anoxic zone has the main function of denitrification, nitrate nitrogen is obtained by medium exchange through a circulation port of a circulation flow guide plate between the anoxic zone and the aerobic zone, the amount of circulating mixed liquid is large, generally 2Q (Q is the flow rate of raw sewage), sewage in the equipment forms circulation through the circulation port of the flow guide plate under the action of a stirring device so as to carry out medium exchange, and the anaerobic zone replaces a mixed liquid reflux system of the traditional A2/O process, so that the aim of reducing the energy consumption of sewage treatment is fulfilled. An aeration disc is arranged in the aerobic zone, the reaction unit is multifunctional, and BOD removal, nitrification, phosphorus absorption and the like are carried out at the reaction unit. After medium exchange reaction is carried out between the aerobic zone and the anoxic zone through circulation, the treated sewage overflows to a sedimentation tank from the aerobic zone and the anoxic zone, and secondary reaction is carried out in the sedimentation tank. In order to prevent the impact of the discharged water on the bottom precipitated sludge, the baffle plates are designed to be sequentially heightened from the positions which are flush with the water outlet, flush with the liquid level and higher than the water outlet, and the sedimentation tank is equally divided, so that the impact on the bottom precipitated sludge is avoided, and the discharged water from the aerobic zone is also prevented from directly flowing out from the water outlet of the sedimentation tank.
The invention has the beneficial effects that:
1. high efficiency: the medium exchange area between the anoxic zone and the aerobic zone is enlarged, and the medium between the anoxic zone and the aerobic zone can be continuously exchanged by reasonably controlling the circulation flow, so that the nitrification and the denitrification fully react.
2. Low energy consumption: the circulation generated by the combined action of the circulation port of the guide plate and the stirring device replaces a mixed liquid reflux system of the traditional A2/O process equipment, in addition, the sludge reflux is settled by utilizing the self gravity of the sludge, thereby achieving the reflux purpose, and a sludge pump is not required to be arranged outside, thereby reducing the energy consumption of the mixed liquid reflux and the sludge reflux in the sewage treatment process.
3. Good internal flow regime and reduced start-up period: a gas, solid and liquid three-phase fluidized bed experimental platform is constructed for two cells, the influence of a long guide plate circulation port on the liquid phase flow state of the fluidized bed is analyzed by utilizing a laser Particle Image Velocimetry (PIV) technology, and the experimental result shows that: the flow guide plate annular flow port has the functions of reducing hydraulic concentration and dead zones and uniform hydraulic distribution, is favorable for sludge nucleation and shortens the A2/O starting period.
4. High volume utilization (small hydraulic dead zone): the dynamic experimental research shows that the push type stirring blades and the opening baffle plate jointly act to form a circulation flow, the hydraulic distribution is uniform, the dead zone is small, and meanwhile, the sludge precipitation is also prevented.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line E-E of FIG. 1;
FIG. 4 is a sectional view taken along line B-B of FIG. 1;
FIG. 5 is a schematic view of a baffle configuration;
fig. 6 is a flow chart of the present invention.
In the figure: 1. an anaerobic zone; 2. an anaerobic tank baffle plate; 3. an anoxic zone I; 4. a second anoxic zone; 5. a third anoxic zone; 6. an anoxic zone IV; 7. an aerobic zone I; 8. a second aerobic zone; 9. an aerobic zone III; 10. the aerobic zone IV; 11. a sedimentation tank; 12. a water outlet; 13. a first anoxic zone partition plate; 14. a second anoxic zone partition plate; 15. a third anoxic zone partition plate; 16. an overflow port of the anaerobic zone; 17. an overflow port of the anoxic zone; 18. a sludge discharge port; 19. a stirring device; 20. a first aerobic zone partition plate; 21. a second aerobic zone partition plate; 22. a third aerobic zone partition plate; 23. an overflow port I of the aerobic zone; 24. an overflow port II of the aerobic zone; 25. an aeration disc; 26. a baffle; 27. an annular flow port; 28. and a baffle plate.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1: as shown in figures 1-6 of the drawings,
an integrated reflux-free A2O device based on a fluidized bed comprises an anaerobic zone 1, an anoxic zone, an aerobic zone and a sedimentation tank 11, wherein the anaerobic zone 1, the anoxic zone and the sedimentation tank 11 are sequentially arranged and communicated through overflow ports, the aerobic zone is arranged at two sides of the anoxic zone and communicated with the anoxic zone and the sedimentation tank 11, the anoxic zone and the aerobic zone are separated by a guide plate 26, and the guide plate 26 is provided with at least two circulation ports 27 from top to bottom; the bottom of the aerobic zone is provided with an aeration disc 25, and stirring devices 19 are arranged in the anaerobic zone 1 and the anoxic zone; the bottom of the sedimentation tank 11 is provided with a sludge return port and a sludge discharge port 18, the sludge return port is communicated with the anaerobic zone 1, and the top end of the side wall of one side of the sedimentation tank 11, which is far away from the anoxic zone, is provided with a water outlet 12.
The anaerobic zone 1 is divided into two chambers by an anaerobic zone clapboard 2, and the bottom end of the anaerobic zone clapboard 2 is spaced from the bottom surface of the anaerobic zone 1; the anoxic zone is divided into an anoxic zone I3, an anoxic zone II 4, an anoxic zone III 5 and an anoxic zone IV 6 by an anoxic zone clapboard I13, an anoxic zone clapboard II 14 and an anoxic zone clapboard III 15, the aerobic zone is divided into an aerobic zone I7, an aerobic zone II 8, an aerobic zone III 9 and an aerobic zone IV 10 by an aerobic zone clapboard I20, an anoxic zone clapboard III 15 and the bottom surface of the anoxic zone, the aerobic zone clapboard I20, the aerobic zone clapboard II 21 and the bottom surface of the aerobic zone are fixed, the top end of the aerobic zone clapboard I20 is provided with an aerobic zone overflow port I23, the anoxic zone clapboard II 14 and the bottom surface of the anoxic zone are provided with a gap, and the bottom end of the aerobic zone clapboard III 22 and the bottom surface of the aerobic zone are provided with a gap. A stirring device 19 is arranged in each chamber of the anaerobic zone 1 and the aerobic zone.
By being close to anoxic zone one side to keeping away from anoxic zone one side parallel arrangement have a plurality of baffles 28 in the sedimentation tank 11, baffle 28 bottom and sedimentation tank bottom have the interval, and baffle 28 is highly increased in proper order by being close to anoxic zone one side to keeping away from anoxic zone one side, and the baffle 28 top that is closest to anoxic zone one side is less than the liquid level, and the baffle 28 top that is furthest from anoxic zone one side is higher than the liquid level.
The sewage flows into the anaerobic zone 1 from the water inlet and then enters the anoxic zone I3 from the overflow port 16 of the anaerobic zone, the sewage in the anoxic zone I3 enters the aerobic zone I7 from the annular flow port 27, the sewage in the aerobic zone I7 enters the aerobic zone II 8 from the overflow port 23 of the aerobic zone I, the sewage in the aerobic zone II 8 enters the anoxic zone II 4 from the annular flow port 27, the sewage in the anoxic zone II 4 enters the anoxic zone III 5, the sewage in the anoxic zone III 5 enters the aerobic zone III 9 from the annular flow port 27, the sewage in the aerobic zone III 9 enters the aerobic zone IV 10 from the bottom end of the partition plate III 22 of the aerobic zone at intervals, the sewage in the aerobic zone IV 10 enters the anoxic zone IV 6 from the annular flow port 27, the sewage in the anoxic zone IV 6 enters the sedimentation tank 11 from the anoxic zone port 17, and simultaneously part of the sewage in the aerobic zone IV 10 enters the sedimentation tank 11 from the overflow port II 24 of the aerobic zone.
The sewage in the anoxic zone circularly circulates with the aerobic zone through the annular flow port 27 on the guide plate 26, finally flows into the sedimentation tank 11 through the overflow port, the sludge in the sedimentation tank 11 is precipitated under the action of the baffle plate 28, the supernatant is discharged from the water outlet 12, part of the sludge flows back to the anaerobic zone 1 from the bottom of the sedimentation tank 11 through the sludge return port, and the rest of the sludge is discharged from the sludge discharge port 18. The anaerobic zone 1 has the main function of releasing phosphorus, meanwhile, part of organic matters are aminated, the main function of the anoxic zone is denitrification, nitrate nitrogen is obtained by medium exchange through the circulation port 27 of the guide plate 26 between the anoxic zone and the aerobic zone, the amount of circulating mixed liquid is large, generally 2Q (Q is the flow rate of raw sewage), sewage in the equipment forms circulation through the circulation port 27 of the guide plate 26 under the action of the stirring device 19 so as to carry out medium exchange, and the anaerobic zone replaces a mixed liquid backflow system of the traditional A2/O process, so that the purpose of reducing the energy consumption of sewage treatment is achieved. An aeration tray 25 is provided in the aerobic zone, where the reaction unit is multifunctional and BOD removal, nitrification and phosphorus absorption, etc. are all performed. After the medium exchange reaction is carried out between the aerobic zone and the anoxic zone through circulation, the treated sewage overflows to the sedimentation tank 11 from the aerobic zone and the anoxic zone, and secondary reaction is carried out in the sedimentation tank 11. To prevent the impact of the effluent on the bottom settled sludge, the baffles 28 are designed to be sequentially raised from being flush with the water outlet, flush with the liquid level, and higher than the water outlet, and the sedimentation tank 11 is divided equally, so that the impact on the bottom settled sludge is avoided, and the effluent from the aerobic zone is also prevented from directly flowing out from the water outlet of the sedimentation tank.
Finally, it should be noted that the above-mentioned list is only a specific embodiment of the present invention. It is obvious that the present invention is not limited to the above embodiments, but many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (4)
1. The utility model provides an integration does not have backward flow A2O equipment based on fluidized bed, includes anaerobic zone, anoxic zone, aerobic zone and sedimentation tank, its characterized in that: the anaerobic zone, the anoxic zone and the sedimentation tank are sequentially arranged and communicated through overflow ports, the aerobic zone is arranged on two sides of the anoxic zone and communicated with the anoxic zone and the sedimentation tank, the anoxic zone and the aerobic zone are separated by a guide plate, and the guide plate is provided with at least two circulation ports from top to bottom; the bottom of the aerobic zone is provided with an aeration disc, and stirring devices are arranged in the anaerobic zone and the anoxic zone; the bottom of the sedimentation tank is provided with a sludge return port and a sludge discharge port, the sludge return port is communicated with the anaerobic zone, and the top end of the side wall of one side of the anoxic zone away from the sedimentation tank is provided with a water outlet.
2. An integrated non-return A2O apparatus as claimed in claim 1, wherein: the anaerobic zone is divided into two chambers by an anaerobic zone clapboard, and the bottom end of the anaerobic zone clapboard is spaced from the bottom surface of the anaerobic zone; the anoxic zone is divided into an anoxic zone I, an anoxic zone II, an anoxic zone III and an anoxic zone IV by an anoxic zone partition plate I, an anoxic zone II and an anoxic zone partition plate III, the aerobic zone is divided into an aerobic zone I, an aerobic zone II, an aerobic zone III and an aerobic zone IV by an aerobic zone partition plate I, an aerobic zone partition plate II and an aerobic zone partition plate III, the anoxic zone partition plate I, the anoxic zone partition plate III are fixed with the bottom surface of the anoxic zone, the aerobic zone partition plate I, the aerobic zone partition plate II and the bottom surface of the aerobic zone are fixed, the top end of the aerobic zone partition plate I is provided with an aerobic zone overflow port I, the anoxic zone partition plate II and the bottom surface of the anoxic zone are provided with a gap, and the bottom end of the aerobic zone partition plate III and the bottom surface of the aerobic zone are provided with a gap.
3. An integrated non-return A2O apparatus as claimed in claim 2, wherein: and stirring devices are arranged in each cavity of the anaerobic zone and the aerobic zone.
4. An integrated non-return A2O apparatus as claimed in claim 1, wherein: by being close to anoxic zone one side to keeping away from anoxic zone one side parallel arrangement with a plurality of baffles in the sedimentation tank, the baffle equally divides the sedimentation tank, and the baffle bottom has the interval with the sedimentation tank bottom, and the baffle is highly increased in proper order by being close to anoxic zone one side to keeping away from anoxic zone one side, and the baffle top that is closest to anoxic zone one side is less than the liquid level, and the baffle top that is furthest from anoxic zone one side is higher than the liquid level.
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