CN222770735U

CN222770735U - AO contact oxidation integrated sewage treatment equipment

Info

Publication number: CN222770735U
Application number: CN202421567879.3U
Authority: CN
Inventors: 刘锋刚; 张为; 覃添雨; 刘万云
Original assignee: CMCU Engineering Co Ltd
Current assignee: CMCU Engineering Co Ltd
Priority date: 2024-07-03
Filing date: 2024-07-03
Publication date: 2025-04-18
Anticipated expiration: 2034-07-03

Abstract

The utility model provides an AO contact oxidation integrated sewage treatment equipment, which belongs to the technical field of sewage treatment. The equipment is exquisitely designed, has stable effects, and is economical and practical. The equipment adopts the AO contact oxidation process, and through the two main stages of anoxic contact oxidation and aerobic contact oxidation, combined with subsequent treatment steps such as secondary sedimentation, filtration and ultraviolet disinfection, it realizes effective treatment of sewage. The equipment consists of an anoxic zone, an aerobic zone, an oxygen elimination zone, a secondary sedimentation zone, a filtration zone, a disinfection equipment, and a double-layer equipment area (upper equipment area and lower equipment area). The anoxic zone is provided with fixed anoxic biological fillers and a submersible mixer, and the aerobic zone is provided with fixed aerobic biological fillers and an aeration system. The utility model realizes the advantages of compact equipment structure, stable treatment effect, small footprint, and low engineering cost through innovative points such as double-layer equipment area design and the application of submersible mixers. It is suitable for small sewage treatment projects in towns or rural areas.

Description

AO contact oxidation integrated sewage treatment equipment

Technical Field

The utility model belongs to the technical field of sewage treatment, and relates to AO contact oxidation integrated sewage treatment equipment.

Background

When the sewage treatment scale is large, a complete sewage treatment plant is generally constructed, the main structure adopts a reinforced concrete structure type, and on the contrary, when the sewage treatment scale is small, the integrated sewage treatment equipment type is often adopted. The integrated sewage treatment equipment is commonly used for village and town or rural sewage treatment projects. The integrated sewage treatment equipment has the characteristics of modularization of equipment, integration of systems, short production period, small occupied area and low engineering investment.

The existing common integrated sewage treatment equipment in the market has more types and uneven quality, and the adopted sewage treatment process is also five-flower eight-door, and the actual treatment effects are different. The common sewage treatment processes mainly comprise an anaerobic Anoxic Aerobic (AAO) process, a Moving Bed Biofilm Reactor (MBBR) process and a Membrane Bioreactor (MBR) process. The AAO process is a traditional biological denitrification and dephosphorization activated sludge process, is a common process for large and medium-sized sewage treatment plants, has the advantages of simple structure and low manufacturing cost when being used for integrated equipment, but also has the defects of unstable treatment effect caused by easy sludge loss and easy sludge expansion. The MBBR technology is a treatment technology between an activated sludge method and a biomembrane method, has the advantages of the activated sludge method and the biomembrane method, has the advantages of good treatment effect, difficult sludge loss and good shock resistance, and has the defects of high cost of the suspended filler and easy failure of fluidization of the suspended filler. The MBR technology adopts a microfiltration membrane to replace a secondary sedimentation tank in the conventional technology, and has the remarkable advantages of good effluent quality and the defects of higher manufacturing cost and higher operation cost.

The contact oxidation method is essentially the same as the MBBR process, is a treatment process between the activated sludge process and the biomembrane process, has the advantages of the activated sludge process and the biomembrane process, and has the advantages of good treatment effect, difficult sludge loss and good shock resistance. Unlike MBBR, the contact oxidation method uses fixed filler instead of suspended filler, and the fixed filler has the remarkable advantage of low cost, and meanwhile, the filler is fixed in water, so that the bad effect that the fluidization failure of the filler is easy to occur and the failure is avoided as in MBBR.

The anaerobic-aerobic contact oxidation process, namely the AO contact oxidation process, consists of an anaerobic unit and an aerobic unit, wherein the main function of the aerobic unit is to remove organic matters in sewage through an aerobic biochemical reaction and convert ammonia nitrogen into nitrate nitrogen through a nitration reaction, and the main function of the anaerobic unit is to convert the nitrate nitrogen returned by an aerobic tank into nitrogen through a denitrification reaction, so that biological denitrification of the sewage is realized. The AAO process consists of an anaerobic unit, an anoxic unit and an aerobic unit, and the added anaerobic unit mainly aims at realizing biological dephosphorization. Large and medium sewage treatment plants generally adopt relatively complete AAO (anaerobic-anoxic-oxic) processes with denitrification and dephosphorization, and small sewage treatment systems pay more attention to practicability, and often consider that limited carbon sources in sewage are preferentially used for realizing biological denitrification, and dephosphorization mainly adopts a chemical dephosphorization mode, so that biochemical systems generally adopt an AO process.

Disclosure of utility model

The utility model aims to provide the AO contact oxidation integrated sewage treatment equipment which is ingenious in design, stable and reliable in treatment effect and obvious in economic advantage.

An AO contact oxidation integrated sewage treatment device sequentially comprises an anoxic zone, an aerobic zone, an oxygen-removing zone, a secondary sedimentation zone, a filtering zone and a disinfection device along the sewage flow direction, and is provided with a double-layer device zone in a matching way, wherein the double-layer device zone comprises an upper-layer device zone and a lower-layer device zone;

Wherein the upper equipment area is provided with an inner reflux pump and an outer reflux pump, and the lower equipment area is provided with a rotary blower, chemical dephosphorization dosing equipment and carbon source dosing equipment;

Biological denitrification and organic matter removal of sewage are realized by combining anoxic contact oxidation and aerobic contact oxidation.

Optionally, the anoxic zone is provided with a fixed anoxic biological filler for providing a carrier for growth and propagation of denitrifying bacteria.

Optionally, the anoxic zone is provided with a submersible mixer, and the submersible mixer is used for mixing sewage and biological filler to promote denitrification reaction.

Optionally, the aerobic zone is provided with a fixed aerobic biological filler and an aeration system, the aerobic biological filler is used for providing a carrier for growth and propagation of aerobic microorganisms, and the aeration system is used for providing air for the aerobic zone to form an aerobic state.

Optionally, the oxygen-eliminating area is arranged at the tail end of the aerobic area and is used for eliminating oxygen in the mixed solution and avoiding the mixed solution flowing back to the anoxic area from damaging the anoxic environment.

Optionally, the secondary sedimentation zone adopts a vertical flow sedimentation tank for realizing mud-water separation, and is provided with a sludge reflux pump and a sludge discharge pipe.

Optionally, the filtering area is provided with a rotary disc filter for further removing suspended substances in the water.

Optionally, the disinfection equipment adopts an ultraviolet sterilizer for disinfecting the filtered effluent.

The utility model has the beneficial effects that:

(1) The integrated sewage treatment equipment adopts a mature, stable and reliable sewage treatment process, has strong impact load and good treatment effect, and the quality of effluent stably reaches the first-level A standard in pollutant emission standard of urban sewage treatment plants.

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

(3) The utility model creatively designs a double-layer equipment area, an inner reflux pump and an outer reflux pump are arranged in an upper-layer equipment area, and a rotary blower and a dosing device are arranged in a lower-layer equipment area. The double-layer design fully utilizes the space of the equipment, reduces the size of the equipment and reduces the occupied area of the equipment.

(4) The utility model creatively arranges the submersible mixer in the anoxic contact area, avoids sewage short flow and ineffective dead angle, thereby efficiently utilizing the whole space of the anoxic area and further strengthening the anoxic denitrification effect.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a top plan view of an AO contact oxidation integrated wastewater treatment facility in accordance with the present utility model;

FIG. 2 is a plan view of the lower layer of the AO contact oxidation integrated wastewater treatment device of the present utility model;

FIG. 3 is a cross-sectional view of water diversion apparatus of the present utility model;

FIG. 4 is a cross-sectional view of water diversion apparatus of the present utility model, taken along line b-b;

reference numerals:

The device comprises an anoxic zone 1, an aerobic zone 2, an anoxic zone 3, an oxygen-eliminating zone 4, a secondary sedimentation zone 5, a filtering zone 6, an ultraviolet disinfection device, a water outlet pipe 7, a lower device zone 8, an upper device zone 9, an 11 water inlet pipe 12, an anoxic biological filler 13, a submersible mixer 21, an aerobic biological filler 22, an aerator 22, a secondary sedimentation tank water outlet weir 41, a secondary sedimentation tank guide cylinder 42, a secondary sedimentation tank mud bucket 43, a rotary disc filter 51, a rotary blower 81, a 82 dosing device 91, an internal reflux pump 92 and an external reflux pump 92.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

In which the drawings are for illustrative purposes only and are not intended to be construed as limiting the utility model, and in which certain elements of the drawings may be omitted, enlarged or reduced in order to better illustrate embodiments of the utility model, and not to represent actual product dimensions, it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

In the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, only for convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the referred devices or elements must have a specific direction, be constructed and operated in a specific direction, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present utility model, and that the specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.

The device consists of an anoxic zone 1, an aerobic zone 2, an oxygen-eliminating zone 3, a secondary sedimentation zone 4, a filtering zone 5, a disinfection device 6, an upper device zone 9 and a lower device zone 8. The anaerobic zone 1 is provided with a fixed anaerobic biological filler 12, a submersible mixer 13 is arranged below the filler, the aerobic zone 2 is provided with a fixed aerobic biological filler 21, an aerator 22 and an aeration pipeline are arranged below the fixed aerobic biological filler, the secondary sedimentation zone 4 adopts a vertical sedimentation tank and is provided with a water outlet weir, a guide cylinder, a mud bucket and the like, the filtering zone 5 is provided with a rotary disc filter 51, the upper equipment zone 9 is provided with an inner reflux pump 91 and an outer reflux pump 92, and the lower equipment zone 8 is provided with a rotary blower 81, chemical dephosphorization dosing equipment and carbon dosing equipment.

The sewage firstly enters the anoxic zone 1, the environment in the anoxic zone 1 is in an anoxic state, and no molecular oxygen exists. Anoxic biological packing 12 provides a carrier for denitrifying bacteria to grow and reproduce. Organic matters in the inlet water are utilized, and nitrate nitrogen in the mixed solution of the aerobic tank is subjected to denitrification reaction in the anoxic tank through the backflow (namely internal backflow) of the mixed solution of the aerobic tank, so that the nitrate nitrogen is converted into nitrogen, and the nitrogen is removed. The bottom of the anoxic zone 1 is provided with the submerged mixer 13, and under the stirring and mixing actions of the submerged mixer 13, sewage fully contacts and reacts with denitrifying bacteria on the biological filler, so that the denitrification reaction is effectively promoted, and dead zones are avoided being formed in the anoxic zone 1.

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

The end of the aerobic zone 2 is provided with an oxygen-removing zone 3, the internal reflux pump 91 sucks the mixed liquor from the oxygen-removing zone 3, and the oxygen-removing zone 3 is used for removing oxygen in the mixed liquor so as to prevent the mixed liquor which flows back to the anoxic zone 1 from containing a large amount of oxygen to destroy the anoxic environment of the anoxic zone 1.

The effluent of the aerobic zone 2 enters a secondary sedimentation tank, the mixed solution containing the falling biological film and a small amount of suspended sludge enters the secondary sedimentation tank to realize sludge-water separation, the sludge is discharged after being precipitated in a mud bucket, and the clear water enters a subsequent filtering treatment unit. The secondary sedimentation tank is provided with a sludge reflux pump, and the sludge reflux can be started according to the requirement during operation. The secondary sedimentation tank is provided with a sludge discharge pipe for periodically discharging sludge.

The filter unit adopts a rotary disc filter 51 to further remove suspended matters in water, so that better effluent quality is obtained.

The filtered effluent reaches the discharge standard after being disinfected by an ultraviolet sterilizer.

Example 1

As shown in the attached drawing, the AO contact oxidation integrated sewage treatment equipment with the treatment capacity of 200m ³/d is used for treating domestic sewage, and the treated effluent reaches the first-level A standard in pollutant emission standard of urban sewage treatment plants.

The equipment comprises an anoxic zone 1 with 1 grid, wherein the hydraulic retention time is 3.5h, a combined biological filler is arranged, 1 submersible mixer 13 is arranged, sewage enters water from the lower part of the anoxic zone 1, and water discharged from the upper part automatically flows into an aerobic zone 2 with 1 grid.

The device comprises a 2-grid aerobic zone 2 and is operated in series. The hydraulic retention time is 8h, the combined biological filler is installed, the bottom of the device is provided with a disc type rubber membrane microporous aerator 22, and an air blower supplies air for the aerator 22. The effluent of the anoxic tank enters the upper part of the 1 st grid of aerobic zone 2, enters the 2 nd aerobic zone 2 through the lower part of the partition wall, and finally enters the secondary sedimentation tank from the upper part of the 2 nd aerobic zone 2.

The end of the aerobic zone 2 is provided with 1 oxygen-removing zone 3, the oxygen-removing zone 3 is not provided with an aerator 22, and the mixed solution of the aerobic zone 2 is refluxed to the front end of the anoxic tank through an internal reflux pump 91 after oxygen is released.

The device comprises a 2-grid secondary sedimentation tank, and is operated in parallel and adopts a vertical flow sedimentation tank type. The hydraulic load on the surface of the sedimentation tank is 0.8m/h, and the sedimentation time is 1.5h. The middle of the sedimentation tank is provided with a guide cylinder of the vertical flow sedimentation tank in a matching way, the periphery of the top is provided with water outlet weirs, and the bottom of the sedimentation tank is provided with a mud bucket. The secondary sedimentation tank is provided with a sludge discharge port and a sludge discharge valve, and is also provided with a sludge reflux system.

The apparatus comprises 1 set of rotary disc filters 51 with a diameter of 2m and a filtration speed of 2m/h. An automatic cleaning and sewage discharging device is arranged.

The effluent from the filter enters into 1 set of pipeline type ultraviolet disinfection equipment 6 with the treatment capacity of 200m3/d positioned in the lower space of the sludge hopper 43 of the secondary sedimentation tank, and after ultraviolet disinfection, the effluent reaches the discharge standard and is discharged out of the integrated treatment equipment.

The lower equipment area 8 is provided with 1 set of sodium acetate dosing equipment 82, and sodium acetate is added as a supplementary carbon source for denitrification in the anoxic area 1. And 1 set of polyaluminum chloride dosing equipment 82 is arranged, and polyaluminum chloride is dosed into the 2 nd aerobic zone 2 to realize chemical dephosphorization. The device is provided with 1 rotary blower 81 for blasting aeration of the aerobic zone 2, the noise of the rotary blower 81 is quite low, and the influence on the surrounding environment is effectively reduced.

The upper equipment area 9 is provided with 1 internal reflux pump 91 to reflux the mixed solution of the aerobic area 2 to the anoxic area 1 so as to realize biological denitrification, and the reflux ratio is 150% -250%. 1 external reflux pump 92 is arranged to reflux the sludge settled in the secondary sedimentation tank to the anoxic tank, and the reflux ratio is 50% -100%.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.

Claims

1. An AO contact oxidation integrated sewage treatment device is characterized by sequentially comprising an anoxic zone, an aerobic zone, an oxygen-eliminating zone, a secondary sedimentation zone, a filtering zone and a disinfection device along the sewage flow direction, and being provided with a double-layer device zone in a matching way, wherein the double-layer device zone comprises an upper-layer device zone and a lower-layer device zone;

2. The apparatus according to claim 1, wherein the anoxic zone is provided with a fixed anoxic biological packing for providing a carrier for the growth and propagation of denitrifying bacteria.

3. The apparatus of claim 2, wherein the anoxic zone is provided with a submersible mixer for mixing the sewage with the biological packing to promote denitrification.

4. The apparatus of claim 1, wherein the aerobic zone is provided with a fixed aerobic biofilm carrier for providing a carrier for growth and propagation of aerobic microorganisms and an aeration system for providing air to the aerobic zone to form an aerobic state.

5. The apparatus of claim 1, wherein the oxygen-eliminating zone is disposed at the end of the aerobic zone, and is configured to eliminate oxygen in the mixed liquor, and to avoid the mixed liquor flowing back to the anoxic zone from damaging the anoxic environment.

6. The apparatus according to claim 1, wherein the secondary sedimentation zone employs a vertical sedimentation tank for effecting sludge-water separation and is equipped with a sludge return pump and a sludge discharge pipe.

7. The apparatus of claim 1, wherein the filtration zone is provided with a rotary disc filter for further removal of suspended substances in the water.

8. The apparatus of claim 1, wherein the disinfection apparatus employs an ultraviolet sterilizer for disinfecting the filtered effluent.