CN113003853A - Integrated A2O sewage treatment system - Google Patents
Integrated A2O sewage treatment system Download PDFInfo
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- CN113003853A CN113003853A CN202011530629.9A CN202011530629A CN113003853A CN 113003853 A CN113003853 A CN 113003853A CN 202011530629 A CN202011530629 A CN 202011530629A CN 113003853 A CN113003853 A CN 113003853A
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Images
Classifications
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- 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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Abstract
The invention provides an integrated A2O sewage treatment system, and relates to the field of sewage treatment. Integration A2O sewage treatment system, including the one-level filtering mechanism, second grade filtering mechanism and the tertiary filtering mechanism who connects gradually, second grade filtering mechanism is including circulation connection's oxygen deficiency pond, anaerobism pond and aerobic tank in proper order. The invention utilizes three filter tanks for biological decontamination, and carries out dephosphorization on the basis of carrying out biological denitrification on the sewage, and the biological decontamination can ensure the quality of the effluent, thereby realizing the function of sewage filtration.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an integrated A2O sewage treatment system.
Background
The water pollution condition is continuously intensified, so that the sewage treatment and regeneration industry is concerned unprecedentedly, the gross profit rate of each region is kept about 70% in recent two years, even some regions exceed 100%, and the industry development potential is very large.
The existing sewage is usually polluted by sludge, the sewage mixed with the sludge is difficult to separate, and the existing treatment equipment has poor separation effect.
Disclosure of Invention
The invention aims to provide an integrated A2O sewage treatment system, which can perform high-efficiency treatment and filtration of sludge in wastewater.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides an integration A2O sewage treatment system, including the one-level filtering mechanism, secondary filter mechanism and the tertiary filter mechanism that connect gradually, secondary filter mechanism is including circulation connection's oxygen deficiency pond, anaerobism pond and aerobic tank in proper order.
In some embodiments of the present invention, the primary filtering mechanism includes a coarse grating, a fine grating, a first sedimentation tank, and a regulating tank, which are connected in sequence.
In some embodiments of the invention, a distribution well is connected between the regulating reservoir and the anoxic reservoir.
In some embodiments of the present invention, the first sedimentation tank is further connected with a rotational flow grit chamber.
In some embodiments of the present invention, the system further comprises a second sedimentation tank connected to the aerobic tank, and the aerobic tank is connected to the tertiary filtration mechanism through the second sedimentation tank.
In some embodiments of the present invention, the third-stage filtering mechanism includes a flocculation reaction tank, a deep-bed filter, a clean water tank and an ultraviolet disinfection tank, which are sequentially connected to the second sedimentation tank.
In some embodiments of the present invention, the second sedimentation tank is further connected to a sludge concentration tank and a filter press in sequence.
In some embodiments of the invention, the deep-bed filter tank is circularly linked with the clean water tank, and the clean water tank is connected with the deep-bed filter tank through a backwashing water pump.
In some embodiments of the invention, the above further comprises a pasteurization tank connected to the uv disinfection tank.
In some embodiments of the invention, the second sedimentation tank is further circularly linked with the anoxic tank.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the embodiment of the application provides an integration A2O sewage treatment system, including the one-level filtering mechanism, secondary filter mechanism and the tertiary filter mechanism that connect gradually, secondary filter mechanism is including circulation connection's oxygen deficiency pond, anaerobism pond and aerobic tank in proper order. The device comprises three filtering mechanisms which are sequentially connected, wherein the first-stage filtering mechanism is used for primary filtering, the second-stage filtering mechanism is used for biological filtering, the third-stage filtering mechanism is used for final-stage treatment filtering, and sewage treated by the third-stage filtering mechanism can reach the A-stage acceptance standard and can be recycled; the secondary filtration comprises a filtration means of three biodegradation tanks, sewage passing through a primary filtration mechanism can enter an anoxic tank, the anoxic tank is a biochemical system with dissolved oxygen controlled between 0.2-0.5mg/l in terms of relative anaerobism and aerobism, the anoxic tank is a reaction tank without dissolved oxygen but with nitrate, the anoxic tank has hydrolysis reaction, the pH value is increased in the denitrification process, and the anoxic tank mainly plays a role in removing nitrate nitrogen by denitrification and removing partial BOD and also has a role in improving biodegradability by the hydrolysis reaction; the sewage passing through the anoxic tank enters the anaerobic tank, and the organic matters are hydrolyzed, acidified and methanated by using the action of anaerobic bacteria in the anaerobic tank, so that the organic matters in the wastewater are removed, the biodegradability of the sewage is improved, and the subsequent aerobic treatment is facilitated; the sewage passing through the anaerobic tank is discharged into the aerobic tank, and the aerobic tank maintains the dissolved oxygen content in the water to be about 4mg/l by measures such as aeration and the like, so that the aerobic microorganism is suitable for growth and propagation, and the structure of pollutants in the water is treated; the anaerobic tank is a structure which does not perform aeration and has high pollutant concentration, and because dissolved oxygen is decomposed and consumed, the water body hardly has dissolved oxygen, so that the anaerobic tank is suitable for anaerobic microorganism activity to treat pollutants in the water; the anoxic pond is a structure which is suitable for aerobic and facultative microorganism life and has low pollutant content due to insufficient aeration or no aeration. Different oxygen environments have different microbial groups, and microorganisms can change behaviors when the environments change, so that the aim of removing different pollutants is fulfilled. Generally, biological denitrification refers to nitrification and denitrification, wherein the nitrification refers to converting ammonium salt and the like into nitrite and converting the nitrite into nitrogen, the denitrification refers to converting nitrate into nitrogen to realize denitrification, the nitrification uses CO2 as a carbon source, the denitrification refers to that heterotrophic bacteria need to consume organic matters in water and can only be performed in an anoxic (with more nitrate) environment (with nitrate, the denitrification is anoxic), so that an anoxic tank is arranged in front of an aerobic tank to ensure that the denitrifying bacteria have enough organic matters as the carbon source to perform denitrification so as to realize denitrification, the aerobic tank returns a part to the anoxic tank to perform denitrification, if the anoxic tank is arranged behind the aerobic tank, other microorganisms in the aerobic environment consume the water, the organic matters in the water after entering the anoxic tank are insufficient, full denitrification is difficult to realize, in addition, the anaerobic environment is kept for phosphorus removal, and the phosphorus removal is 'anaerobic phosphorus release', the anaerobic property is strict anaerobic property (no oxygen and nitrate), the nitrate exists in large quantity, and the anoxic, anaerobic and aerobic properties are the double functions of denitrification and dephosphorization; the invention utilizes three filter tanks for biological decontamination, and carries out dephosphorization on the basis of carrying out biological denitrification on the sewage, and the biological decontamination can ensure the quality of the effluent, thereby realizing the function of sewage filtration.
When in actual use, the staff at first lets in the primary filter mechanism with the sewage stoste and carries out the prefilter in, and the sewage after the filtration completion can let in oxygen deficiency pond, anaerobism pond and good oxygen pond in proper order and carry out biofiltration, and the filtration finishes the back and gets into tertiary filter mechanism once more and carry out the terminal filtration, and the water that filters out at last is carrying out recycle.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a sewage treatment system according to an embodiment of the present invention.
Icon: 1-coarse grating; 101-lifting a pump room; 102-a fine grid; 103-a first sedimentation tank; 104-a regulating reservoir; 105-a rotational flow grit chamber; 106-distributing well; 2-an anoxic tank; 201-an anaerobic pool; 202-an aerobic tank; 203-a second sedimentation tank; 204-sludge concentration tank; 205-a compressor; 3-a flocculation reaction tank; 301-deep bed filter; 302-clean water pool; 303-ultraviolet disinfection tank; 304-a pasteurisation tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the orientation or positional relationship indicated by the term "inside" or the like is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
Referring to fig. 1, fig. 1 is a flow chart of a sewage treatment system according to an embodiment of the present invention.
The embodiment of the application provides an integration A2O sewage treatment system, including the one-level filtering mechanism, secondary filter mechanism and the tertiary filter mechanism that connect gradually, secondary filter mechanism is including circulation connection's oxygen deficiency pond 2, anaerobism pond 201 and good oxygen pond 202 in proper order. The device comprises three filtering mechanisms which are sequentially connected, wherein the first-stage filtering mechanism is used for primary filtering, the second-stage filtering mechanism is used for biological filtering, the third-stage filtering mechanism is used for final-stage treatment filtering, and sewage treated by the third-stage filtering mechanism can reach the A-stage acceptance standard and can be recycled; the secondary filtration comprises a filtration means of three biodegradation tanks, sewage passing through a primary filtration mechanism can enter an anoxic tank 2, the anoxic tank 2 is a biochemical system with dissolved oxygen controlled between 0.2-0.5mg/l in terms of relative anaerobism and aerobism, the anoxic tank 2 is a reaction tank without dissolved oxygen but with nitrate, the anoxic tank 2 has hydrolysis reaction, the pH value is increased in the denitrification process, and the secondary filtration mainly plays a role in removing nitrate nitrogen and simultaneously removes partial BOD and also has a role in improving biodegradability through the hydrolysis reaction; the sewage passing through the anoxic tank 2 enters the anaerobic tank 201, and the organic matters are hydrolyzed, acidified and methanated by using the action of anaerobic bacteria in the anaerobic tank 201, so that the organic matters in the wastewater are removed, the biodegradability of the sewage is improved, and the subsequent aerobic treatment is facilitated; the sewage passing through the anaerobic tank 201 is discharged into the aerobic tank 202, and the aerobic tank 202 maintains the dissolved oxygen content in the water to be about 4mg/l by measures such as aeration and the like, so that aerobic microorganisms are suitable for growth and propagation, and the structure of pollutants in the water is treated; the anaerobic tank 201 is a structure which does not perform aeration and has high pollutant concentration, and because dissolved oxygen is decomposed and consumed, the water body has almost no dissolved oxygen, and the structure is suitable for anaerobic microorganism activity to treat pollutants in the water; the anoxic pond 2 is a structure which is suitable for aerobic and facultative microorganism life and has low pollutant content due to insufficient aeration or no aeration. Different oxygen environments have different microbial groups, and microorganisms can change behaviors when the environments change, so that the aim of removing different pollutants is fulfilled. Generally, biological denitrification refers to nitrification and denitrification, wherein the nitrification refers to conversion of ammonium salt and the like into nitrite and the denitrification refers to conversion of nitrate into nitrogen to realize denitrification, wherein the nitrification uses CO2 as a carbon source for autotrophic bacteria, the denitrification refers to conversion of heterotrophic bacteria which need to consume organic matters in water and can be carried out in an anoxic (with more nitrate) environment (with nitrate, the denitrification is anoxic), so that the anoxic tank 2 is placed in front of the aerobic tank 202 to ensure that the denitrifying bacteria have enough organic matters as a carbon source to carry out denitrification so as to realize denitrification, the aerobic tank 202 reflows a part to the anoxic tank 2 to carry out denitrification, if placed behind the aerobic tank 202, other microorganisms in the aerobic environment consume organic matters in the water, the organic matters in the water after entering the anoxic tank 2 are insufficient, and complete denitrification is difficult to realize, and in addition, the anaerobic environment is kept to remove phosphorus, the phosphorus removal is 'anaerobic phosphorus release and aerobic phosphorus absorption', the anaerobic process is strictly anaerobic (no oxygen and nitrate), the nitrate exists in large quantity and is anoxic, anoxic + anaerobic + aerobic for the double functions of nitrogen and phosphorus removal; the invention utilizes three filter tanks for biological decontamination, and carries out dephosphorization on the basis of carrying out biological denitrification on the sewage, and the biological decontamination can ensure the quality of the effluent, thereby realizing the function of sewage filtration.
In the activated sludge of the biological nitrogen and phosphorus removal system of the secondary filter mechanism in the embodiment, the flora mainly comprises nitrobacteria, denitrifying bacteria and phosphorus accumulating bacteria, and in the aerobic section, the nitrobacteria convert ammonia nitrogen in inflow and ammonia nitrogen formed by ammoniation of organic nitrogen into nitrate through biological nitrification; in the anoxic section, denitrifying bacteria convert nitrate brought by internal reflux into nitrogen to escape into the atmosphere through biological denitrification, so that the aim of denitrification is fulfilled; in the anaerobic section, phosphorus is released by phosphorus accumulating bacteria, and easily degradable organic matters such as lower fatty acid and the like are absorbed; in the aerobic section, phosphorus-accumulating bacteria absorb phosphorus in excess and remove phosphorus through discharging excess sludge.
During the in-service use, the staff at first lets in the primary filter mechanism with the sewage stoste and carries out the prefilter in, and sewage after the filtration completion can let in oxygen deficiency pond 2, anaerobism pond 201 and good oxygen pond 202 in proper order carries out biofiltration, gets into tertiary filter mechanism again after the filtration completion and carries out the terminal filtration, and the water that filters out at last is carrying out recycle.
In some embodiments of the present invention, as illustrated in fig. 1, the primary filtering mechanism comprises a coarse grating 1, a fine grating 102, a first settling tank 103 and a regulating tank 104, which are connected in sequence.
The sedimentation tank in the embodiment is a structure for removing suspended matters in water by using sedimentation, and comprises a water inlet, a water outlet, a water flow part and a sludge hopper. The horizontal sedimentation basin is built by concrete, brick masonry structure or masonry lined soil basin. The advection type sedimentation tank has simple structure, good sedimentation effect, stable working performance and wide use, but occupies larger area; the regulation tank 104 is a structure for regulating the flow rate of inlet and outlet water. The narrow definition: in order to ensure that the pipe canal and the structure work normally and are not influenced by the peak flow or concentration change of the wastewater, a regulating tank 104 is arranged in front of a wastewater treatment facility, and the regulating tank has the functions of regulating the water quantity and the water quality, regulating the pH value and the water temperature of the wastewater, pre-aeration and can also be used for accident drainage; after sewage enters a plant area, suspended solid in the sewage is removed through the coarse grating 1 and the fine grating 102 to carry out primary treatment, the suspended solid after the separation of the coarse grating 1 and the fine grating 102 is subjected to external treatment, the sewage after primary filtration is subjected to standing filtration sand in the first sedimentation tank 103, and the sewage after the sedimentation is finished enters the regulating tank 104 to regulate the corresponding pH value.
In the above embodiment, the lift pump room 101 is further connected between the coarse grating 1 and the fine grating 102, so that the sewage can be conveniently circulated from the fine grating 102.
In some embodiments of the invention, as illustrated in fig. 1, a distribution well 106 is connected between the conditioning tank 104 and the anoxic tank 2.
The distribution well 106 in this embodiment is typically located after the grit chamber and before the biological treatment system. The sewage treatment device has the functions of collecting sewage and reducing impact on a treatment system caused by flow change. After passing through the grit chamber, the sewage flows to the distribution well 106, and after reaching a certain capacity, the sewage is uniformly distributed to the next-stage structure for treatment.
In some embodiments of the invention, the first settling tank 103 is also connected to a cyclone grit chamber 105, as described in fig. 1.
The rotational flow grit chamber 105 in this embodiment is a grit chamber for controlling the flow state and flow rate of water flow by mechanical force, accelerating the sedimentation of sand particles and taking away organic substances with water flow; the sand basin comprises an inflow port, an outflow port, a sand settling area, a sand hopper, a turbine driving device, a sand discharge system and the like, sewage flows into the sand settling area from the tangential direction of the inflow port, and the water inlet channel is provided with a water drop weir, so that sand possibly deposited at the bottom of the channel slides downwards into the sand basin; and a baffle is also arranged, so that water flow and sand flow toward the bottom of the sand basin when entering the sand basin, and the wall attachment effect is enhanced. The middle of the grit chamber is provided with a speed-adjustable paddle board to keep the water flow in the chamber circulating. The paddle board, the baffle and the water inlet flow are combined together, the rotating turbine blade enables sand grains to flow spirally, separation of organic matters and the sand grains is promoted, and due to different centrifugal forces, the sand grains with higher relative density are thrown to the pool wall and sink into the sand hopper under the action of gravity; and the lighter organic matters are separated from the sand in the middle part of the grit chamber, and the organic matters are taken out of the chamber along with the effluent cyclone. By adjusting the rotating speed, the optimal sand setting effect can be achieved. The sand in the sand hopper can be removed by air lifting, sand discharging by a sand discharging pump and the like, and the sand-water separation is carried out to achieve the standard of clean sand discharging.
In some embodiments of the present invention, as shown in fig. 1, the present invention further comprises a second sedimentation tank 203 connected to the aerobic tank 202, and the aerobic tank 202 is connected to the third-stage filtration mechanism through the second sedimentation tank 203. Through setting up second sedimentation tank 203 and being used for carrying out sediment filtration once more with the filterable water body in the good oxygen pond 202, improve the filter effect.
In some embodiments of the present invention, as shown in fig. 1, the third stage filtration mechanism comprises a flocculation reaction tank 3, a deep bed filter 301, a clean water tank 302 and an ultraviolet disinfection tank 303 which are connected with the second sedimentation tank 203 in sequence.
The flocculation reaction tank 3 in this embodiment is a coagulation sedimentation tank, which is one of sedimentation tanks in water supply and drainage. The coagulation process is the most basic and very important treatment process in the treatment of industrial water and domestic sewage, and by adding some medicaments (generally called coagulant and coagulant aid) into water, particles which are difficult to precipitate in the water can be polymerized with each other to form colloid, and then are combined with impurities in the water body to form larger floccules. The flocculating constituent has strong adsorption capacity, can adsorb suspended matters, and can adsorb partial bacteria and soluble substances. The flocculating constituent is absorbed, the volume is increased and the flocculating constituent sinks, the device is a water treatment method which makes the colloid and the fine suspended substance in the waste water flocculate into flocculating constituent under the action of coagulant and then separates and removes the flocculating constituent; the deep-bed filter 301 is generally used for removing suspended matters in water treatment, and is a single-layer homogeneous filter material or multi-layer filter material filter, and the filter bed is deeper than a traditional fast filter, and is mostly a down-flow gravity filter. The filter material is natural quartz sand, and the multi-layer filter material is anthracite, quartz sand, garnet and the like. The grain diameters of each filter material are arranged in the order of small at the top and big at the bottom. The hydraulic load and the nitrate volume load are properly designed, and the deep bed filter 301 also has the function of denitrification to synchronously remove suspended matters and nitrate; the clean water tank 302 is used for retaining the filtered water body; the ultraviolet disinfection tank 303 is used for destroying the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in the cells of the microorganism body by using ultraviolet rays with proper wavelength, so as to cause death of growing cells and/or death of regenerative cells, thereby achieving the effect of sterilization and disinfection.
In some embodiments of the present invention, as shown in fig. 1, the second settling tank 203 is further connected to a sludge concentration tank 204 and a filter press in sequence.
In this embodiment, the sludge concentration tank 204 is used for a structure for sludge concentration, and the concentrated sludge is compressed and filtered again by the filter press, so that the sludge can be conveniently treated.
In some embodiments of the invention, as shown in fig. 1, the deep bed filter 301 is circularly linked with a clean water tank 302, and the clean water tank 302 is connected with the deep bed filter 301 through a backwashing water pump. The water in the clean water tank 302 can be precipitated again, and the filtering effect is further improved
In some embodiments of the present invention, as depicted in FIG. 1, a pasteurization tank 304 is also included in connection with the UV sterilization tank.
The Parshall tank (also called the Papanicolaou metering tank 304) in this embodiment is an auxiliary device for open channel flow measurement. In the process of liquid flow, the water path in which the flow is not full of pipes is called an open channel, and the open channel flow meter is applied to the place where municipal sewage treatment inflow and discharge channels are provided, and can be discharged as a recovery area through the device.
In some embodiments of the invention, the second sedimentation tank 203 is also cyclically linked to the anoxic tank 2, as described in figure 1. Through being connected second sedimentation tank 203 with oxygen deficiency pond 2, make the water after the filtration can also carry out biofiltration once more, further improve the filter effect.
In summary, the embodiment of the present invention provides an integrated A2O sewage treatment system, which includes a first-stage filtering mechanism, a second-stage filtering mechanism and a third-stage filtering mechanism that are connected in sequence, where the second-stage filtering mechanism includes an anoxic tank 2, an anaerobic tank 201 and an aerobic tank 202 that are connected in sequence in a circulating manner. The device comprises three filtering mechanisms which are sequentially connected, wherein the first-stage filtering mechanism is used for primary filtering, the second-stage filtering mechanism is used for biological filtering, the third-stage filtering mechanism is used for final-stage treatment filtering, and sewage treated by the third-stage filtering mechanism can reach the A-stage acceptance standard and can be recycled; the secondary filtration comprises a filtration means of three biodegradation tanks, sewage passing through a primary filtration mechanism can enter an anoxic tank 2, the anoxic tank 2 is a biochemical system with dissolved oxygen controlled between 0.2-0.5mg/l in terms of relative anaerobism and aerobism, the anoxic tank 2 is a reaction tank without dissolved oxygen but with nitrate, the anoxic tank 2 has hydrolysis reaction, the pH value is increased in the denitrification process, and the secondary filtration mainly plays a role in removing nitrate nitrogen and simultaneously removes partial BOD and also has a role in improving biodegradability through the hydrolysis reaction; the sewage passing through the anoxic tank 2 enters the anaerobic tank 201, and the organic matters are hydrolyzed, acidified and methanated by using the action of anaerobic bacteria in the anaerobic tank 201, so that the organic matters in the wastewater are removed, the biodegradability of the sewage is improved, and the subsequent aerobic treatment is facilitated; the sewage passing through the anaerobic tank 201 is discharged into the aerobic tank 202, and the aerobic tank 202 maintains the dissolved oxygen content in the water to be about 4mg/l by measures such as aeration and the like, so that aerobic microorganisms are suitable for growth and propagation, and the structure of pollutants in the water is treated; the anaerobic tank 201 is a structure which does not perform aeration and has high pollutant concentration, and because dissolved oxygen is decomposed and consumed, the water body has almost no dissolved oxygen, and the structure is suitable for anaerobic microorganism activity to treat pollutants in the water; the anoxic pond 2 is a structure which is suitable for aerobic and facultative microorganism life and has low pollutant content due to insufficient aeration or no aeration. Different oxygen environments have different microbial groups, and microorganisms can change behaviors when the environments change, so that the aim of removing different pollutants is fulfilled. Generally, biological denitrification refers to nitrification and denitrification, wherein the nitrification refers to conversion of ammonium salt and the like into nitrite and the denitrification refers to conversion of nitrate into nitrogen to realize denitrification, wherein the nitrification uses CO2 as a carbon source for autotrophic bacteria, the denitrification refers to conversion of heterotrophic bacteria which need to consume organic matters in water and can be carried out in an anoxic (with more nitrate) environment (with nitrate, the denitrification is anoxic), so that the anoxic tank 2 is placed in front of the aerobic tank 202 to ensure that the denitrifying bacteria have enough organic matters as a carbon source to carry out denitrification so as to realize denitrification, the aerobic tank 202 reflows a part to the anoxic tank 2 to carry out denitrification, if placed behind the aerobic tank 202, other microorganisms in the aerobic environment consume organic matters in the water, the organic matters in the water after entering the anoxic tank 2 are insufficient, and complete denitrification is difficult to realize, and in addition, the anaerobic environment is kept to remove phosphorus, the phosphorus removal is 'anaerobic phosphorus release and aerobic phosphorus absorption', the anaerobic process is strictly anaerobic (no oxygen and nitrate), the nitrate exists in large quantity and is anoxic, anoxic + anaerobic + aerobic for the double functions of nitrogen and phosphorus removal; the invention utilizes three filter tanks for biological decontamination, and carries out dephosphorization on the basis of carrying out biological denitrification on the sewage, and the biological decontamination can ensure the quality of the effluent, thereby realizing the function of sewage filtration.
During the in-service use, the staff at first lets in the primary filter mechanism with the sewage stoste and carries out the prefilter in, and sewage after the filtration completion can let in oxygen deficiency pond 2, anaerobism pond 201 and good oxygen pond 202 in proper order carries out biofiltration, gets into tertiary filter mechanism again after the filtration completion and carries out the terminal filtration, and the water that filters out at last is carrying out recycle.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an integration A2O sewage treatment system, its characterized in that, is including the one-level filtering mechanism, second grade filtering mechanism and the tertiary filtering mechanism who connects gradually, second grade filtering mechanism is including circulation connection's oxygen deficiency pond, anaerobism pond and aerobic tank in proper order.
2. The integrated A2O sewage treatment system according to claim 1, wherein the primary filtering mechanism comprises a coarse grating, a fine grating, a first sedimentation tank and a regulating tank which are connected in sequence.
3. The integrated A2O sewage treatment system according to claim 2, wherein a distribution well is connected between the adjusting tank and the anoxic tank.
4. The integrated A2O sewage treatment system according to claim 2, wherein a cyclone grit chamber is further connected to the first settling tank.
5. The integrated A2O sewage treatment system according to claim 1, further comprising a second sedimentation tank connected to the aerobic tank, wherein the aerobic tank is connected to the tertiary filtration mechanism through the second sedimentation tank.
6. The integrated A2O sewage treatment system according to claim 5, wherein the tertiary filter mechanism comprises a flocculation reaction tank, a deep bed filter, a clean water tank and an ultraviolet disinfection tank which are connected with the second sedimentation tank in turn.
7. The integrated A2O sewage treatment system according to claim 6, wherein the second sedimentation tank is further connected with a sludge concentration tank and a filter press in sequence.
8. The integrated A2O sewage treatment system according to claim 6, wherein the deep-bed filter is circularly linked with the clean water tank, and the clean water tank is connected with the deep-bed filter through a backwash water pump.
9. The integrated A2O sewage treatment system according to claim 6, further comprising a pasteurization tank connected to the UV disinfection tank.
10. The integrated A2O sewage treatment system according to claim 5, wherein the second sedimentation tank is further cyclically linked to the anoxic tank.
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