CN114656035A - High-efficiency energy-saving AAO biological treatment system and method capable of operating under multiple working conditions - Google Patents
High-efficiency energy-saving AAO biological treatment system and method capable of operating under multiple working conditions Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000005273 aeration Methods 0.000 claims abstract description 57
- 238000010992 reflux Methods 0.000 claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 20
- 239000010865 sewage Substances 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 239000011574 phosphorus Substances 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 9
- 230000008030 elimination Effects 0.000 claims description 8
- 238000003379 elimination reaction Methods 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 7
- 239000005416 organic matter Substances 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 5
- 230000004075 alteration Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
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- 230000001502 supplementing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 9
- 206010021143 Hypoxia Diseases 0.000 description 6
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
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- 241000894006 Bacteria Species 0.000 description 1
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- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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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
- C02F7/00—Aeration of stretches of water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a high-efficiency energy-saving AAO biological treatment system and a method capable of operating under multiple working conditions, wherein the system comprises: the pre-anoxic zone is connected with the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone in sequence; the five-point water inlet pipe is provided with five water inlet control branches, and each water inlet control branch is connected with the pre-anoxic zone, the anaerobic zone, the anoxic zone and the post-change zone respectively; the multi-path aeration pipe is provided with a plurality of aeration control branches, and each aeration control branch is respectively connected to the inner bottoms of the front change zone, the aerobic zone and the rear change zone; the multipoint internal reflux pipe is provided with three internal reflux control branches, the inlet of the multipoint internal reflux pipe is connected with the rear change area, and each internal reflux control branch is respectively connected with the anaerobic area, the anoxic area and the pre-anoxic area; the outer return pipe is connected with the interior of the pre-anoxic zone; the tail end of the rear change area is provided with a water outlet. The system can be operated and treated under corresponding working conditions according to the quality of inlet water, so that the treatment effect is better, and the energy consumption and the carbon source are effectively saved.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an efficient energy-saving AAO biological treatment system and method capable of operating under multiple working conditions.
Background
The AAO biological treatment and improvement process is a traditional activated sludge treatment system, has good functions of removing organic matters, removing nitrogen and phosphorus, can realize continuous operation, has mature process technology, reliable equipment operation and low treatment cost, and is mainly applied to large and medium town sewage plants or industrial sewage plants. The AAO process system adopts various combinations of an anaerobic zone, an anoxic zone and an aerobic zone and different sludge backflow modes, releases phosphorus in the anaerobic zone, performs denitrification in the anoxic zone, performs degradation of organic matters, nitrification of ammonia nitrogen and excessive phosphorus uptake in the aerobic zone, and finally realizes biological treatment and standard discharge of sewage.
At present, the traditional AAO biological treatment and improvement system is mainly divided into a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone, wherein raw sewage is mixed with sludge returned from the outside of a secondary sedimentation tank and then enters the pre-anoxic zone, and the pre-anoxic zone mainly eliminates the influence of water-entering dissolved oxygen and nitrate nitrogen brought back by external return on the anaerobic environment; the anaerobic zone mainly removes phosphorus; the anoxic zone is mainly denitrificationDenitrifying, namely nitrate nitrogen is conveyed from an aerobic zone through internal reflux, and denitrifying bacteria finally reduce the nitrate nitrogen into N by using organic matters (carbon sources) in raw water2(ii) a The aerobic zone is mainly used for degrading organic matters. In 3 main biochemical reaction environments of anaerobic reaction, anoxic reaction and aerobic reaction, organic matters in the sewage are firstly converted into easily decomposed micromolecules from difficultly decomposed macromolecules and then converted into CO2Discharging; meanwhile, ammonia nitrogen in the sewage is firstly converted into nitrite nitrogen and nitrate nitrogen, phosphorus is converted into activated sludge and is discharged along with excess sludge, and finally the sewage can meet the discharge standard specified by the state after being treated.
The water inlet of the traditional AAO biological treatment and improvement system is generally three-point water inlet, the pre-anoxic zone and the anoxic zone need to utilize a carbon source in raw water for denitrification reaction when carrying out denitrification, the anaerobic zone needs to utilize the carbon source in the raw water for dephosphorization, and the water inlet amount can be actually adjusted. The internal reflux control branch is generally a point and flows back to the anoxic zone from the aerobic zone, and the nitrate nitrogen flows back to the anoxic zone to carry out denitrification reaction.
However, the inventor finds that the main disadvantages of the conventional AAO biological treatment and improvement system are as follows: the tank capacity of each area of the anaerobic zone, the anoxic zone and the aerobic zone is fixed, so that the multi-operation working conditions such as water quality change and the like are difficult to meet, the water quality concentration in summer is low, the retention time of the aerobic zone is generally longer, and the over-aeration phenomenon generally exists, so that the energy consumption is wasted; in winter, the water quality concentration is higher, the carbon-nitrogen ratio is unbalanced, the retention time of an anoxic zone is insufficient, deep denitrification is difficult, and the consumption of carbon source and medicament is overlarge.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an efficient energy-saving AAO biological treatment system and method capable of operating under multiple working conditions, and further solves the technical problems in the prior art.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides an efficient energy-saving AAO biological treatment system capable of operating under multiple working conditions, which comprises:
a five-point water inlet pipe, a pre-anoxic zone, an anaerobic zone, an anoxic zone, a front change zone, an aerobic zone, a rear change zone, a multi-path aeration pipe, a multi-point inner return pipe and an outer return pipe; wherein,
the pre-anoxic zone is sequentially connected with the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone;
the five-point water inlet pipe is provided with five water inlet control branches, and each water inlet control branch is respectively connected with the pre-anoxic zone, the anaerobic zone, the anoxic zone and the post-change zone;
the multi-path aeration pipe is provided with a plurality of aeration control branches, and each aeration control branch is respectively connected to the inner bottoms of the front change zone, the aerobic zone and the rear change zone;
the multipoint internal reflux pipe is provided with three internal reflux control branches, the inlet of the multipoint internal reflux pipe is connected with the rear change area, and each internal reflux control branch is respectively connected with the anaerobic area, the anoxic area and the pre-anoxic area;
the outer return pipe is connected with the interior of the pre-anoxic zone;
and the tail end of the rear change area is provided with a water outlet.
The embodiment of the invention also provides a high-efficiency energy-saving AAO biological treatment method capable of operating under multiple working conditions, and when the high-efficiency energy-saving AAO biological treatment system capable of operating under multiple working conditions is adopted to treat sewage, the system operates according to the working conditions corresponding to the quality of inlet water, and comprises the following steps:
if the actual inlet water quality is the same as the designed inlet water quality, the system operates according to the normal inlet water quality working condition, and the front and rear change areas of the system perform aeration through corresponding aeration control branches of the multi-path aeration pipe, so that the front and rear change areas perform aerobic operation, and perform normal nitrogen and phosphorus removal and organic matter degradation treatment; if the monitored effluent does not reach the preset denitrification effect, closing an aeration control branch of a second post-change subarea of the post-change area, starting a stirrer in the second post-change subarea, and taking the second post-change subarea as an oxygen elimination area for eliminating redundant dissolved oxygen;
if the actual inlet water is far lower than the designed inlet water quality, operating according to the working condition of low inlet water quality, monitoring a numerical value according to an online ammonia nitrogen analysis instrument, or manually sampling and analyzing an ammonia nitrogen numerical value along the way, if the ammonia nitrogen reaches the standard, completely or partially closing the aeration control branches of the first post-change subarea and the second post-change subarea of the post-change subarea, and opening a stirrer of the post-change subarea with the aeration control branches closed; when the denitrification requirement is greater than the organic matter degradation requirement, the sewage is treated according to the low inflow water quality working condition;
if the actual inflow is far higher than the designed inflow water quality, the system operates according to the working condition of the high inflow water quality, and adopts the following two operation modes:
the first mode of operation is: the front change area runs in an anoxic mode completely or partially, the first rear change area runs in an aerobic mode, and the second rear change area runs in an anoxic mode;
the second operation mode is as follows: if the first operation mode can not meet the denitrification requirement, returning the second post-change subarea to the pre-anoxic area and the anaerobic area through a multi-point internal return pipe, and operating the pre-anoxic area and the anaerobic area as anoxic areas; the anterior change zone operates in the absence of oxygen, either wholly or partially, depending on the situation; the first post-change subarea is in anoxic operation or aerobic operation; and the second post-change subregion oxygen elimination region operates.
Compared with the prior art, the high-efficiency energy-saving AAO biological treatment system and method capable of operating under multiple working conditions, provided by the invention, have the beneficial effects that:
through before good oxygen district, the rear end sets up preceding, back change district respectively to before, back change district all connects aeration branch pipe and sets up the agitator, can be according to the actual conditions who carries out quality of water, the aeration of control preceding, back change district, stirring, realize good oxygen, oxygen deficiency and oxygen elimination operation, and then make this processing system, can be according to the quality of water state of intaking, handle with the operating mode operation that corresponds, not only the treatment effect is better, and effectively energy saving and carbon source.
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 description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic side view of an energy efficient AAO biological treatment system capable of multi-condition operation according to an embodiment of the present invention.
FIG. 2 is a schematic plan view of an energy-efficient AAO biological treatment system capable of multi-operating mode according to an embodiment of the present invention.
In the figure: 1-five water inlet pipes; 2-a pre-anoxic zone; 3-an anaerobic zone; 4-anoxic zone; 5 a pre-alteration zone; 51-first pre-change partition; 52-second pre-change partition; 6-aerobic zone; 7-posterior change region; 71-first post-alteration zone; 72-second post-change zone; 8-a multi-path aeration pipe; 9-multi-point internal reflux pipe; 10-ammonia nitrogen instrument; 11-an outer return pipe; 12-a water outlet; 13-secondary sedimentation tank.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below by combining the specific content of the invention; it is to be understood that the described embodiments are merely exemplary of the invention, and are not intended to limit the invention to the particular forms disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The term "consisting of … …" is meant to exclude any technical feature elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only to the elements explicitly recited in that clause, and elements recited in other clauses are not excluded from the overall claims.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured," etc., are to be construed broadly, as for example: can be fixedly connected, can also be 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 meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 ~ 8" is recited, then the numerical range should be interpreted to include ranges of "2 ~ 7", "2 ~ 6", "5 ~ 7", "3 ~ 4 and 6 ~ 7", "3 ~ 5 and 7", "2 and 5 ~ 7", and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not intended to imply or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting herein.
The high-efficiency energy-saving AAO biological treatment system and method capable of operating under multiple working conditions provided by the invention are described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer. The reagents or instruments used in the examples of the present invention are not specified by manufacturers, and are all conventional products available by commercial purchase.
As shown in fig. 1 and 2, an embodiment of the present invention provides an energy-efficient AAO biological treatment system capable of operating under multiple operating conditions, including:
a five-point water inlet pipe, a pre-anoxic zone, an anaerobic zone, an anoxic zone, a front change zone, an aerobic zone, a rear change zone, a multi-path aeration pipe, a multi-point inner return pipe and an outer return pipe; wherein,
the pre-anoxic zone is connected with the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone in sequence;
the five-point water inlet pipe is provided with five water inlet control branches, and each water inlet control branch is respectively connected with the pre-anoxic zone, the anaerobic zone, the anoxic zone and the post-change zone;
the multi-path aeration pipe is provided with a plurality of aeration control branches, and each aeration control branch is respectively connected to the inner bottoms of the front change zone, the aerobic zone and the rear change zone;
the multipoint internal reflux pipe is provided with three internal reflux control branches, the inlet of the multipoint internal reflux pipe is connected with the rear change area, and each internal reflux control branch is respectively connected with the anaerobic area, the anoxic area and the pre-anoxic area;
the outer return pipe is connected with the interior of the pre-anoxic zone;
and the tail end of the rear change area is provided with a water outlet.
In the system, the front variation area is composed of a first front variation subarea and a second front variation subarea which are sequentially connected;
the bottoms of the first front change subarea and the second front change subarea are respectively connected with an aeration opening of the multi-path aeration pipe.
In the system, the post-change area is composed of a first post-change subarea and a second post-change subarea which are sequentially connected;
the tail end of the second rear change subarea is provided with the water outlet;
the bottoms of the first post-change subarea and the second post-change subarea are respectively connected with an aeration opening of the multi-path aeration pipe.
In the system, stirrers are arranged in the pre-anoxic zone, the anaerobic zone, the anoxic zone, the front change zone and the rear change zone.
In the system, a stirrer is arranged in each of the pre-anoxic zone and the anaerobic zone;
two stirrers are distributed and arranged in the anoxic zone;
a stirrer is arranged in each of the first front change subarea and the second front change subarea of the front change subarea;
and a stirrer is respectively arranged in the first post-change subarea and the second post-change subarea of the post-change area.
The stirrers all adopt low-speed vertical shaft stirrers.
In the system, online ORP instruments are arranged in the anaerobic zone and the anoxic zone;
an online sludge concentration meter and a DO instrument are installed in the aerobic zone;
and an ammonia nitrogen instrument is respectively arranged in the first post-change subarea and the second post-change subarea of the post-change subarea.
In the system, the outer return pipe is connected with the return port of the secondary sedimentation tank.
In the system, the pre-anoxic zone, the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone are all integrated in a total tank body. Preferably, the total tank body, the pre-anoxic zone, the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone are all square tank bodies.
The embodiment of the invention also provides an efficient energy-saving AAO biological treatment method capable of operating under multiple working conditions, which adopts the efficient energy-saving AAO biological treatment system capable of operating under multiple working conditions to operate according to the working conditions corresponding to the quality of inlet water during sewage treatment and comprises the following steps:
if the actual inlet water quality is the same as the designed inlet water quality, the system operates according to the normal inlet water quality working condition, and the front and rear change areas of the system perform aeration through corresponding aeration control branches of the multi-path aeration pipe, so that the front and rear change areas perform aerobic operation, and perform normal nitrogen and phosphorus removal and organic matter degradation treatment; if the monitored total nitrogen removal rate of the effluent does not reach the designed total nitrogen removal rate or the carbon source consumption exceeds a preset upper limit value (indicating that the carbon source consumption is excessive), closing an aeration control branch of a second after-change subarea of the after-change area, starting a stirrer in the second after-change subarea, taking the second after-change subarea as an oxygen elimination area for eliminating redundant dissolved oxygen, ensuring low dissolved oxygen flowing back to the oxygen deficiency area, avoiding excessive consumption of the carbon source, ensuring the denitrification effect of the oxygen deficiency area, and improving the total nitrogen removal rate;
if the actual inlet water quality is far lower than the designed inlet water quality, namely the inlet water quality reaches the low inlet water quality standard, operating according to the low inlet water quality working condition, monitoring the numerical value according to an online ammonia nitrogen analysis instrument, or manually sampling and analyzing the ammonia nitrogen numerical values of an aerobic zone and a post-change zone along the way, if the ammonia nitrogen reaches the standard, completely or partially closing the aeration control branches of a first post-change zone and a second post-change zone of the post-change zone, and opening a stirrer of the post-change zone of which the aeration control branch is closed; when the concentration of organic matters is lower and the C/N is less than 4, operating to treat sewage according to the low inflow water quality working condition, and opening an inflow control branch connected with the post-change area to add raw water for supplementing a carbon source into the post-change area so as to supplement the carbon source for carrying out denitrification reaction; if the actual inflow is higher than the designed inflow water quality, the system operates according to the working condition of the high inflow water quality, and adopts the following two operation modes:
the first mode of operation is: the front change area runs in an anoxic mode completely or partially, the first rear change area runs in an aerobic mode, and the second rear change area runs in an anoxic mode;
the second operation mode is as follows: if the first operation mode can not meet the denitrification requirement, returning the second post-change subarea to the pre-anoxic area and the anaerobic area through a multi-point internal return pipe, and operating the pre-anoxic area and the anaerobic area as anoxic areas; the anterior change zone operates in the absence of oxygen, either wholly or partially, depending on the situation; the first post-change subarea is in anoxic operation or aerobic operation; and the second post-change subregion oxygen elimination region operates.
In summary, in the AAO biological treatment system according to the embodiment of the present invention, the front and rear change zones are respectively disposed at the front and rear ends of the aerobic zone, and the aeration branch pipes and the stirrers are respectively connected to the front and rear change zones, so that aeration and stirring of the front and rear change zones can be controlled according to the actual conditions of water quality, and aerobic, anoxic and anoxic operations can be realized, and further the treatment system can perform treatment according to the water quality state of the influent water under corresponding operation conditions, thereby not only providing a better treatment effect, but also effectively saving energy consumption and carbon sources.
In order to more clearly show the technical scheme and the technical effects thereof provided by the present invention, the following detailed description is made of specific embodiments of the efficient and energy-saving AAO biological treatment system and method capable of operating under multiple operating conditions provided by the embodiments of the present invention.
Examples
As shown in fig. 1 and 2, an embodiment of the present invention provides an efficient energy-saving AAO biological treatment system capable of operating under multiple operating conditions, which can operate under corresponding operating conditions according to changing water quality, thereby achieving energy saving and consumption reduction.
The system comprises: the method comprises the following steps: a pre-anoxic zone, an anaerobic zone, an anoxic zone, a front change zone, an aerobic zone and a rear change zone; the functions of the pre-anoxic zone, the anaerobic zone and the anoxic zone are the same as the functions of the corresponding tank body of the traditional AAO and the improved system thereof, the front change zone is arranged in front of the aerobic zone, the rear change zone is arranged behind the aerobic zone, and the tank volume of the aerobic zone and the total volume of the biochemical tank are kept unchanged. The front change area and the rear change area are respectively divided into two areas (namely a first front change area, a second front change area, a first rear change area and a second rear change area), each area is provided with an independently controllable stirrer and an independently controllable aeration control branch, and then the switching of the oxygen deficiency and aerobic flexible operation is realized.
The inlet water of the system adopts a five-point inlet pipe provided with five inlet control branches, the specific five-point inlet pipe is provided with five inlet control branches, 5-point inlet water can be realized, 3-point inlet water of the pre-anoxic zone, the anaerobic zone and the anoxic zone (namely inlet points corresponding to the first inlet control branch, the second inlet control branch and the third inlet control branch) is the same as that of the traditional AAO and the improvement system thereof, the 4 th point and the 5 th point arranged on the five-point inlet pipe are respectively connected to two inlet points of the first post-change subarea and the second post-change subarea, when any subarea or all subareas of the post-change subareas run in an anoxic mode, the inlet water of the 4 th point and the inlet water of the 5 th point can be flexibly opened, the carbon source in the raw water is fully utilized for denitrification, the deep denitrification is realized, and the additional carbon source is saved.
The reflux of the system is divided into external reflux and internal reflux, wherein the external reflux is the same as the traditional AAO and the improved system thereof, and the external reflux is connected with the secondary sedimentation tank through an external reflux pipe. The internal reflux adopts three reflux control branches, 3 points of reflux from a back change area to an anaerobic area, an anoxic area and a pre-anoxic area can be realized, the reflux control branches can be controlled and adjusted through a gate, the reflux point of an anoxic tank is the same as that of the traditional AAO and an improved system thereof, and the reflux control branches at the pre-anoxic area and the anaerobic tank are added in the system, so that when the pre-anoxic area and the anaerobic tank need anoxic operation, the reflux control branches at the pre-anoxic area and the anaerobic area can be opened, and the denitrification reaction is further prolonged.
In the system, 1 stirrer is generally respectively installed in the pre-anoxic zone and the aerobic zone, 2 stirrers are generally installed in the anoxic zone, 1 stirrer is respectively installed in two subareas of the front change zone, 1 stirrer is respectively installed in two subareas of the rear change zone, the stirrers arranged in each tank body all adopt low-speed vertical shaft stirrers, the power of the stirrers is only half of that of the high-speed submersible stirrers adopted by the conventional AAO and improved systems thereof, and the energy-saving operation can be realized.
In the system, a multi-path aeration pipe provided with a plurality of aeration control branches is used as an aeration system: the aerobic zone and the front and rear change zones are connected with the aeration control branches of the multi-path aeration pipes, and flexible switching can be realized through independent aeration controlled by valves.
The instrument and control device arranged in the system comprises: the anaerobic zone and the anoxic zone are provided with an online ORP instrument, and the aerobic zone is provided with an online sludge concentration meter and a DO instrument, which are the same as the traditional AAO and the improved system thereof; 1 ammonia nitrogen instrument is respectively arranged in 2 subareas of the post-change area of the system, and the mode of the post-change area is judged according to the ammonia nitrogen value monitored; and sampling and analyzing ammonia nitrogen values along the way, if the ammonia nitrogen reaches the standard, closing each aeration control branch in the back change area, and starting the low-speed stirrer to realize energy-saving operation.
Above-mentioned processing system according to the difference of the quality of water of intaking, operates according to the operating mode that corresponds, includes:
(1) normal influent water quality operating conditions:
if the actual inlet water quality is the same as the designed inlet water quality, the front and rear change areas are operated as aerobic to carry out normal nitrogen and phosphorus removal and organic matter degradation treatment. If the denitrification effect is not good enough, the aeration control branch of the second rear change subarea is closed, the stirrer is started, and the second rear change subarea can be used as an anoxic area, so that the influence on the denitrification effect of the anoxic area due to excessive dissolved oxygen brought by internal reflux to the anoxic area is avoided.
(2) The low inlet water quality operation condition is as follows:
if the actual inflow water quality is far lower than the designed inflow water quality, namely the actual inflow water quality reaches the low inflow water quality, according to the on-line ammonia nitrogen analysis instrument monitoring value, or the ammonia nitrogen values of the aerobic zone and the post-change zone are manually sampled and analyzed along the way, if the ammonia nitrogen reaches the standard, the aeration control branches of the two partitions of the post-change zone are completely or partially closed according to specific conditions, the low-speed stirrer is started, sludge deposition is avoided, and consumption reduction operation is realized.
When the denitrification demand is larger than the organic matter degradation demand, the operation working condition can be adopted, and a raw water inlet point is added in the rear change area to supplement a carbon source for carrying out denitrification reaction.
(3) High influent water quality operating conditions:
if the actual inflow water quality is higher than the designed inflow water quality, the following 2 operation modes can be adopted when deep denitrification is needed and organic matters are needed to be degraded: 1) the front change area can be wholly or partially operated as an oxygen-poor area, the first rear change area is operated as an aerobic area, the second rear change area is operated as an oxygen-eliminating area, and the aerobic air volume is increased; 2) if the mode 1) can not meet the requirement of denitrification, an internal reflux control branch is refluxed to a pre-anoxic zone and an anaerobic zone, the requirement of dephosphorization is abandoned (the requirement of dephosphorization can be realized by back-end chemical dephosphorization), and the pre-anoxic zone and the anaerobic zone are both used as anoxic zones to operate; the anterior change zone can operate in the anoxic state partially or completely according to the condition; the first post-change subarea can be operated in an anoxic mode and can also be operated in an aerobic mode; the second post-alteration zone may operate as an oxygen elimination zone.
In summary, the processing system and method of the embodiments of the invention have at least the following advantages:
(1) through set up two change districts around good oxygen district, preceding, back change district promptly, two change districts both can the oxygen deficiency operation, can good oxygen operation again, avoid each functional area pond capacity fixed, oxygen deficiency, good oxygen district are nimble to be switched over, correspond multiple operating mode.
(2) The inflow is 5-point inflow, the inflow flow can be adjusted through a valve, and compared with 3-point inflow of a traditional AAO and an improved system thereof, reasonable utilization of raw water carbon sources can be realized. The internal reflux is 3-point reflux, the reflux quantity can be adjusted by a gate, and compared with 1-point reflux of the traditional AAO and an improved system thereof, the switching of a pre-anoxic zone, an anaerobic zone and an anoxic zone can be realized, and the operation is more flexible.
(3) Compared with the traditional high-speed submersible stirrer, the low-speed vertical shaft stirrer has the advantages of low rotating speed, low power, good mixing effect, convenience in maintenance and energy consumption saving.
(4) The system has simple structure, does not need to increase a large amount of civil engineering quantity, is suitable for the construction of a biochemical pool of a new project, and is also suitable for the reconstruction of the biochemical pool of the existing project.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Claims (10)
1. An energy-efficient AAO biological treatment system that can multiplex condition operation, its characterized in that includes:
a five-point water inlet pipe, a pre-anoxic zone, an anaerobic zone, an anoxic zone, a front change zone, an aerobic zone, a rear change zone, a multi-path aeration pipe, a multi-point inner return pipe and an outer return pipe; wherein,
the pre-anoxic zone is sequentially connected with the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone;
the five-point water inlet pipe is provided with five water inlet control branches, and each water inlet control branch is respectively connected with the pre-anoxic zone, the anaerobic zone, the anoxic zone and the post-change zone;
the multi-path aeration pipe is provided with a plurality of aeration control branches, and each aeration control branch is respectively connected to the inner bottoms of the front change zone, the aerobic zone and the rear change zone;
the multipoint internal reflux pipe is provided with three internal reflux control branches, the inlet of the multipoint internal reflux pipe is connected with the rear change area, and each internal reflux control branch is respectively connected with the anaerobic area, the anoxic area and the pre-anoxic area;
the outer return pipe is connected with the interior of the pre-anoxic zone;
and the tail end of the rear change area is provided with a water outlet.
2. The AAO biological treatment system capable of operating under multiple operating conditions of claim 1, wherein the pre-alteration zone is composed of a first pre-alteration zone and a second pre-alteration zone connected in sequence;
the bottoms of the first front change subarea and the second front change subarea are respectively connected with an aeration opening of the multi-path aeration pipe.
3. The AAO biological treatment system capable of operating under multiple operating conditions of claim 1, wherein the post-alteration zone is composed of a first post-alteration zone and a second post-alteration zone connected in sequence;
the tail end of the second rear change subarea is provided with the water outlet;
the bottoms of the first post-change subarea and the second post-change subarea are respectively connected with an aeration opening of the multi-path aeration pipe.
4. The AAO biological treatment system capable of operating under multiple operating conditions of any one of claims 1 to 3, wherein stirrers are arranged in the pre-anoxic zone, the anaerobic zone, the anoxic zone, the front change zone and the rear change zone.
5. The AAO biological treatment system capable of operating under multiple working conditions, according to claim 4, wherein a stirrer is arranged in each of the pre-anoxic zone and the anaerobic zone;
two stirrers are distributed and arranged in the anoxic zone;
a stirrer is arranged in each of the first front change subarea and the second front change subarea of the front change subarea;
and a stirrer is respectively arranged in the first post-change subarea and the second post-change subarea of the post-change subarea.
6. The AAO biological treatment system capable of operating under multiple operating conditions of claim 5, wherein the stirrers are all low speed vertical shaft stirrers.
7. The AAO biological treatment system capable of operating under multiple working conditions of any one of claims 1 to 3, wherein online ORP meters are installed in the anaerobic zone and the anoxic zone;
an online sludge concentration meter and a DO meter are installed in the aerobic zone;
and an ammonia nitrogen instrument is respectively arranged in the first post-change subarea and the second post-change subarea of the post-change area.
8. The AAO biological treatment system capable of operating under multiple working conditions according to any one of claims 1 to 3, wherein the external return pipe is connected with a return port of the secondary sedimentation tank.
9. The AAO biological treatment system capable of operating under multiple operating conditions of any one of claims 1 to 3, wherein the pre-anoxic zone, the anaerobic zone, the anoxic zone, the front change zone, the aerobic zone and the rear change zone are all integrally arranged in a total tank body.
10. An energy-efficient AAO biological treatment method capable of operating under multiple operating conditions, characterized in that, when the energy-efficient AAO biological treatment system capable of operating under multiple operating conditions of any one of claims 1 to 9 is used for treating sewage, the system operates under operating conditions corresponding to the quality of the influent water, and comprises:
if the actual inlet water quality is the same as the designed inlet water quality, the system operates according to the normal inlet water quality working condition, and the front and rear change areas of the system perform aeration through corresponding aeration control branches of the multi-path aeration pipe, so that the front and rear change areas perform aerobic operation, and perform normal nitrogen and phosphorus removal and organic matter degradation treatment; if the monitored total nitrogen removal rate of the effluent does not reach the designed total nitrogen removal rate or the carbon source consumption exceeds a preset upper limit value, closing an aeration control branch of a second post-change subarea of the post-change area, starting a stirrer in the second post-change subarea, and taking the second post-change subarea as an oxygen elimination area for eliminating redundant dissolved oxygen;
if the actual influent water quality reaches the low influent water quality standard, operating according to the working condition of the low influent water quality, monitoring numerical values according to an online ammonia nitrogen analysis instrument, or manually sampling and analyzing ammonia nitrogen numerical values of an aerobic tank and a post-change zone along the way, if the ammonia nitrogen reaches the standard, completely or partially closing the aeration control branches of a first post-change zone and a second post-change zone of the post-change zone, and starting a stirrer of the post-change zone with the aeration control branches closed; when the concentration of organic matters is lower and the C/N is less than 4, operating to treat sewage according to the low inflow water quality working condition, and opening an inflow control branch connected with the post-change area to add raw water for supplementing a carbon source into the post-change area;
if the actual inflow water quality is higher than the designed inflow water quality, the system operates according to the working condition of the high inflow water quality, and adopts the following two operation modes:
the first mode of operation is: the front change area runs in an anoxic mode completely or partially, the first rear change area runs in an aerobic mode, and the second rear change area runs in an anoxic mode;
the second operation mode is as follows: if the first operation mode can not meet the denitrification requirement, returning the second post-change subarea to the pre-anoxic area and the anaerobic area through a multi-point internal return pipe, and operating the pre-anoxic area and the anaerobic area as anoxic areas; the anterior change zone operates in the absence of oxygen, either wholly or partially, depending on the situation; the first post-change subarea is in anoxic operation or aerobic operation; and the second post-change subregion oxygen elimination region operates.
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