AO contact oxidation integrated sewage treatment equipment

Abstract

The utility model provides AO contact oxidation integrated sewage treatment equipment, which belongs to the technical field of sewage treatment and is exquisite in design, stable in effect, economical and practical. According to the equipment, an AO contact oxidation process is adopted, two main stages of anoxic contact oxidation and aerobic contact oxidation are adopted, and subsequent treatment steps such as secondary sedimentation, filtration and ultraviolet disinfection are combined, so that sewage is effectively treated. The equipment consists of an anoxic zone, an aerobic zone, an oxygen elimination zone, a secondary sedimentation zone, a filtering zone, disinfection equipment and a double-layer equipment zone (an upper-layer equipment zone and a lower-layer equipment zone). The anoxic zone is provided with a fixed anoxic biological filler and a submersible stirrer, and the aerobic zone is provided with a fixed aerobic biological filler and an aeration system. Through the innovation points of double-layer equipment area design, application of the submersible stirrer and the like, the device has the advantages of compact equipment structure, stable treatment effect, small occupied area, low construction cost and the like, and is suitable for small sewage treatment projects in villages, towns, rural areas and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment and relates to AO contact oxidation integrated sewage treatment equipment. Background Art

[0002] When the scale of sewage treatment is large, a complete sewage treatment plant is generally built, and the main structure adopts a reinforced concrete structure; on the contrary, when the scale of sewage treatment is small, integrated sewage treatment equipment is often used. Integrated sewage treatment equipment is commonly used in township or rural sewage treatment projects. The characteristics of integrated sewage treatment equipment are modular equipment, system integration, short production period, small footprint, and low project investment.

[0003] At present, there are many types of integrated sewage treatment equipment commonly seen in the market, with uneven quality, and the sewage treatment processes used are also varied, with different actual treatment effects. The more common sewage treatment processes are mainly anaerobic anoxic aerobic (abbreviated as "AAO") process, moving bed biofilm reactor (abbreviated as "MBBR") process, and membrane bioreactor (abbreviated as "MBR") process. Among them, the AAO process is a traditional activated sludge process for biological nitrogen and phosphorus removal. It is a commonly used process in large and medium-sized sewage treatment plants. When used in integrated equipment, it has the advantages of simple structure and low cost, but it also has the disadvantages of easy loss of sludge and easy expansion of sludge, resulting in unstable treatment effect. The MBBR process adds suspended fillers to the conventional process. It is essentially a treatment process between the activated sludge process and the biofilm process. Therefore, it has the advantages of both the activated sludge process and the biofilm process, and has the advantages of good treatment effect, sludge is not easy to lose, and good impact resistance. Its disadvantages are high cost of suspended fillers and easy failure of fluidization of suspended fillers. The MBR process uses microfiltration membrane to replace the secondary sedimentation tank in the conventional process. It has the significant advantage of good effluent quality and the disadvantages of high construction cost and high operating cost.

[0004] The contact oxidation process is essentially the same as the MBBR process. It is also a treatment process between the activated sludge process and the biofilm process. It has the advantages of both the activated sludge process and the biofilm process, with good treatment effect, sludge is not easy to lose, and good impact resistance. Unlike MBBR, the contact oxidation process uses fixed fillers instead of suspended fillers, and fixed fillers have the significant advantage of low cost. At the same time, the fillers are fixed in the water, and there will be no adverse consequences of filler fluidization failure and failure like MBBR.

[0005] The anoxic aerobic contact oxidation process, referred to as the AO contact oxidation process, consists of an anoxic unit and an aerobic unit. The main function of the aerobic unit is to remove organic matter from sewage through aerobic biochemical reactions, and to convert ammonia nitrogen into nitrate nitrogen through nitrification reactions; the main function of the anoxic unit is to convert nitrate nitrogen returned from the aerobic pool into nitrogen gas through denitrification reactions, thereby achieving biological denitrification of sewage. The AAO process consists of anaerobic, anoxic and aerobic units, and the main function of the added anaerobic unit is to achieve biological phosphorus removal. Large and medium-sized sewage treatment plants generally adopt a relatively complete AAO process that has both nitrogen removal and phosphorus removal, while small-scale sewage treatment systems pay more attention to practicality, and often consider giving priority to the limited carbon source in sewage for biological denitrification, while phosphorus removal mainly adopts chemical phosphorus removal. Therefore, the biochemical system generally adopts the AO process. Utility Model Content

[0006] The purpose of the utility model is to provide an AO contact oxidation integrated sewage treatment equipment with ingenious design, stable and reliable treatment effect and obvious economic advantages.

[0007] An AO contact oxidation integrated sewage treatment equipment includes an anoxic zone, an aerobic zone, an oxygen elimination zone, a secondary sedimentation zone, a filtration zone, and a disinfection device in sequence along the sewage flow direction, and is equipped with a double-layer equipment area, wherein the double-layer equipment area includes an upper equipment area and a lower equipment area;

[0008] The upper equipment area is equipped with an internal reflux pump and an external reflux pump, and the lower equipment area is equipped with a rotary blower, chemical phosphorus removal dosing equipment, and carbon source dosing equipment;

[0009] By combining anoxic contact oxidation with aerobic contact oxidation, biological denitrification and organic matter removal of sewage are achieved.

[0010] Optionally, the anoxic zone is provided with fixed anoxic biological fillers, and the anoxic biological fillers are used to provide a carrier for the growth and reproduction of denitrifying bacteria.

[0011] Optionally, a submersible mixer is provided in the anoxic zone, and the submersible mixer is used to stir and mix the sewage and the biological filler to promote the denitrification reaction.

[0012] Optionally, the aerobic zone is provided with fixed aerobic biological fillers and an aeration system, the aerobic biological fillers are used to provide a carrier for the growth and reproduction of aerobic microorganisms, and the aeration system is used to provide air to the aerobic zone to form an aerobic state.

[0013] Optionally, the oxygen elimination zone is arranged at the end of the aerobic zone to eliminate oxygen in the mixed liquid and prevent the mixed liquid from flowing back to the anoxic zone and destroying the anoxic environment.

[0014] Optionally, the secondary sedimentation zone adopts a vertical flow sedimentation tank to achieve mud-water separation, and is equipped with a sludge return pump and a sludge discharge pipe.

[0015] Optionally, the filtration area is provided with a rotary disc filter for further removing suspended matter in the water.

[0016] Optionally, the disinfection equipment uses an ultraviolet disinfector to disinfect the filtered water.

[0017] The beneficial effects of the utility model are:

[0018] (1) The integrated sewage treatment equipment of the utility model adopts a mature, stable and reliable sewage treatment process, has strong resistance to shock loads, and has a good treatment effect. The effluent water quality stably reaches the Class A standard in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants".

[0019] (2) The integrated sewage treatment equipment of the utility model has the advantages of compact structure and high integration through ingenious design, which fully demonstrates the advantages of integrated equipment, saves engineering cost and improves the convenience of operation and maintenance.

[0020] (3) The utility model innovatively designs a double-layer equipment area, with an internal reflux pump and an external reflux pump in the upper equipment area, and a rotary blower and a dosing device in the lower equipment area. The double-layer design makes full use of the space of the equipment, reduces the size of the equipment, and reduces the floor space of the equipment.

[0021] (4) The utility model innovatively sets a submersible mixer in the anoxic contact zone, avoiding sewage short-circuiting and the formation of invalid dead corners, thereby efficiently utilizing the entire space of the anoxic zone and further enhancing the effect of anoxic denitrification.

[0022] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 It is the upper plan view of the AO contact oxidation integrated sewage treatment equipment in the utility model;

[0025] Figure 2It is the lower floor plan of the AO contact oxidation integrated sewage treatment equipment in the utility model;

[0026] Figure 3 It is the aa cross-sectional view of the water diversion device in the utility model;

[0027] Figure 4 This is a cross-sectional view of the water diversion device of the utility model taken along line bb;

[0028] Reference numerals:

[0029] 1 anoxic zone, 2 aerobic zone, 3 deoxidation zone, 4 secondary sedimentation zone, 5 filtration zone, 6 ultraviolet disinfection equipment, 7 outlet pipe, 8 lower equipment area, 9 upper equipment area, 11 inlet pipe, 12 anoxic biological filler, 13 submersible mixer, 21 aerobic biological filler, 22 aerator, 41 secondary sedimentation tank outlet weir, 42 secondary sedimentation tank guide tube, 43 secondary sedimentation tank mud hopper, 51 rotary disc filter, 81 rotary blower, 82 dosing equipment, 91 internal reflux pump, 92 external reflux pump. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0031] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] This equipment consists of anoxic zone 1, aerobic zone 2, deoxidation zone 3, secondary sedimentation zone 4, filtration zone 5, disinfection equipment 6, upper equipment zone 9, and lower equipment zone 8. Among them, the anoxic zone 1 is provided with fixed anoxic biological filler 12, and a submerged mixer 13 is provided below the filler; the aerobic zone 2 is provided with fixed aerobic biological filler 21, and an aerator 22 and an aeration pipeline are provided below; the secondary sedimentation zone 4 adopts a vertical flow sedimentation tank, equipped with a water outlet weir, a guide tube and a mud bucket, etc.; the filtration zone 5 is provided with a rotary filter 51; the upper equipment zone 9 is provided with an internal reflux pump 91 and an external reflux pump 92; the lower equipment zone 8 is provided with a rotary blower 81, as well as chemical phosphorus removal dosing equipment and carbon source dosing equipment.

[0034] The sewage first enters the anoxic zone 1. The environment in the anoxic zone 1 is anoxic and there is no molecular oxygen. The anoxic biological filler 12 provides a carrier for the growth and reproduction of denitrifying bacteria. The organic matter in the influent is used to reflux the mixed liquid of the aerobic tank (i.e., internal reflux) so that the nitrate nitrogen therein undergoes a denitrification reaction in the anoxic tank and is converted into nitrogen gas, thereby being removed. A submersible mixer 13 is configured at the bottom of the anoxic zone 1. Under the stirring and mixing action of the submersible mixer 13, the sewage fully contacts and reacts with the denitrifying bacteria on the biological filler, effectively promoting the denitrification reaction and avoiding the formation of a dead zone in the anoxic zone 1.

[0035] The effluent from the anoxic zone 1 enters the aerobic zone 2. In the aerobic zone 2, air is supplied to the aerator 22 at the bottom of the aerobic zone 2 by the rotary blower 81, so as to oxygenate the sewage in the aerobic zone 2 and form an aerobic state. The aerobic biological filler 21 provides a carrier for the growth and reproduction of aerobic microorganisms. In the aerobic pool, on the one hand, the organic matter in the sewage is converted into carbon dioxide and water through the metabolism of aerobic microorganisms, and on the other hand, the ammonia nitrogen in the sewage is converted into nitrate nitrogen under the action of nitrifying bacteria.

[0036] An oxygen removal zone 3 is provided at the end of the aerobic zone 2. An internal reflux pump 91 draws mixed liquid from the oxygen removal zone 3. The function of the oxygen removal zone 3 is to eliminate oxygen in the mixed liquid to prevent the mixed liquid returning to the anoxic zone 1 from containing a large amount of oxygen and destroying the anoxic environment of the anoxic zone 1.

[0037] The effluent from aerobic zone 2 enters the secondary sedimentation tank. After the mixed liquid containing detached biofilm and a small amount of suspended sludge enters the secondary sedimentation tank, mud and water separation is achieved. The sludge is discharged after settling in the mud hopper, and the clean water enters the subsequent filtration treatment unit. The secondary sedimentation tank is equipped with a sludge return pump, which can be turned on for sludge return as needed during operation. The secondary sedimentation tank is equipped with a sludge discharge pipe to discharge sludge regularly.

[0038] The filter unit adopts a rotary filter 51 to further remove suspended matter in the water and obtain better effluent water quality.

[0039] After filtration, the effluent is disinfected by an ultraviolet sterilizer to meet the discharge standards.

[0040] Example 1

[0041] As shown in the attached figure, it is a 200m 3 / d AO contact oxidation integrated sewage treatment equipment is used to treat domestic sewage. The effluent after treatment meets the Level A standard in the "Pollutant Emission Standard for Urban Sewage Treatment Plants".

[0042] The equipment comprises an anoxic zone 1 with a hydraulic retention time of 3.5 hours, a combined biological filler and a submersible mixer 13; sewage enters from the bottom of the anoxic zone 1 and flows out from the top into the first aerobic zone 2 by gravity.

[0043] The equipment includes two aerobic zones 2, which are operated in series. The hydraulic retention time is 8 hours, and a combined biological filler is installed. A disc-type rubber membrane microporous aerator 22 is set at the bottom of the equipment, and the blower provides air for the aerator 22. The effluent from the anoxic tank enters the upper part of the first aerobic zone 2, enters the second aerobic zone 2 through the lower part of the partition wall, and finally enters the secondary sedimentation tank from the upper part of the second aerobic zone 2.

[0044] An oxygen removal zone 3 is arranged at the end of the aerobic zone 2. The oxygen removal zone 3 is not equipped with an aerator 22. After the mixed liquid in the aerobic zone 2 releases oxygen therein, it flows back to the front end of the anoxic tank through the internal reflux pump 91.

[0045] The equipment includes two secondary sedimentation tanks, which are operated in parallel and adopt the type of vertical flow sedimentation tank. The surface hydraulic load of the sedimentation tank is 0.8m / h, and the sedimentation time is 1.5h. A guide tube of a vertical flow sedimentation tank is set in the middle of the sedimentation tank, a water outlet weir is set around the top, and a mud bucket is set at the bottom of the sedimentation tank. The secondary sedimentation tank is equipped with a mud discharge port and mud discharge valve, and a sludge return system is also set.

[0046] The equipment includes a set of rotary filter 51 with a diameter of 2m and a filtering speed of 2m / h. An automatic cleaning and sewage discharge device is provided.

[0047] The effluent from the filter enters a set of pipeline ultraviolet disinfection equipment 6 with a processing capacity of 200m3 / d located in the lower space of the mud hopper 43 of the secondary sedimentation tank. After ultraviolet disinfection, the effluent meets the discharge standard and is discharged from the integrated treatment equipment.

[0048] The lower equipment area 8 is equipped with a set of sodium acetate dosing equipment 82, which adds sodium acetate as a supplementary carbon source for denitrification in the anoxic zone 1. It is equipped with a set of polyaluminium chloride dosing equipment 82, which adds polyaluminium chloride to the second aerobic zone 2 to achieve chemical phosphorus removal. It is equipped with a rotary blower 81, which provides aeration for the aerobic zone 2. The noise of the rotary blower 81 is quite low, which effectively reduces the impact on the surrounding environment.

[0049] The upper equipment area 9 is equipped with an internal reflux pump 91 to return the mixed liquor from the aerobic area 2 to the anoxic area 1 to achieve biological denitrification, with a reflux ratio of 150% to 250%. It is also equipped with an external reflux pump 92 to return the sludge settled in the secondary sedimentation tank to the anoxic tank, with a reflux ratio of 50% to 100%.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. An AO contact oxidation integrated sewage treatment equipment, characterized in that: Along the flow direction of sewage, it includes anoxic zone, aerobic zone, deoxidation zone, secondary sedimentation zone, filtration zone, disinfection equipment, and a double-layer equipment area, wherein the double-layer equipment area includes an upper equipment area and a lower equipment area; The upper equipment area is equipped with an internal reflux pump and an external reflux pump, and the lower equipment area is equipped with a rotary blower, chemical phosphorus removal dosing equipment, and carbon source dosing equipment; By combining anoxic contact oxidation with aerobic contact oxidation, biological denitrification and organic matter removal of sewage are achieved.

2. The device according to claim 1, characterized in that The anoxic zone is provided with fixed anoxic biological fillers, and the anoxic biological fillers are used to provide a carrier for the growth and reproduction of denitrifying bacteria.

3. The device according to claim 2, characterized in that The anoxic zone is provided with a submersible mixer, which is used to stir and mix the sewage and the biological filler to promote the denitrification reaction.

4. The device according to claim 1, characterized in that The aerobic zone is provided with fixed aerobic biological fillers and an aeration system. The aerobic biological fillers are used to provide a carrier for the growth and reproduction of aerobic microorganisms, and the aeration system is used to provide air to the aerobic zone to form an aerobic state.

5. The device according to claim 1, characterized in that The oxygen elimination zone is arranged at the end of the aerobic zone, and is used to eliminate oxygen in the mixed liquid, so as to prevent the mixed liquid from flowing back to the anoxic zone and destroying the anoxic environment.

6. The device according to claim 1, characterized in that The secondary sedimentation area adopts a vertical flow sedimentation tank to achieve mud-water separation, and is equipped with a sludge return pump and a sludge discharge pipe.

7. The device according to claim 1, characterized in that The filter area is provided with a rotary disc filter for further removing suspended matter in the water.

8. The device according to claim 1, characterized in that The disinfection equipment adopts an ultraviolet disinfector to disinfect the filtered water.

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