CN110540293A - Sewage treatment device and method suitable for large-amplitude fluctuation of water quantity - Google Patents

Sewage treatment device and method suitable for large-amplitude fluctuation of water quantity Download PDF

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Publication number
CN110540293A
CN110540293A CN201910787979.4A CN201910787979A CN110540293A CN 110540293 A CN110540293 A CN 110540293A CN 201910787979 A CN201910787979 A CN 201910787979A CN 110540293 A CN110540293 A CN 110540293A
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China
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activated sludge
sewage
water
biological
unit
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Inventor
金鹏康
荣懿
金鑫
石烜
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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Priority to CN201910787979.4A priority Critical patent/CN110540293A/en
Publication of CN110540293A publication Critical patent/CN110540293A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/006Regulation methods for biological treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/286Anaerobic digestion processes including two or more steps
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/38Organic compounds containing nitrogen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/40Liquid flow rate

Abstract

the invention relates to the technical field of sewage treatment, and provides a sewage treatment device and a sewage treatment method suitable for large water quantity fluctuation. The system comprises an activated sludge biological reaction unit for directly introducing sewage, and further comprises a plurality of deep biological denitrification units, wherein the deep biological denitrification units are alternately connected into an activated sludge mixed liquid supplied by the activated sludge biological reaction unit at a set flow rate, the activated sludge biological reaction unit adaptively changes the water level according to the sewage inflow, and the upper part and the lower part of each deep biological denitrification unit are correspondingly communicated with a water purification area and a sludge concentration tank. The water level of the activated sludge biological reaction unit is adaptively changed, sewage is alternately supplied to the deep biological denitrification units at a set flow rate, and the effluent cannot be changed due to the sewage production amount, so that stable sewage treatment can be always kept under the condition of not adopting a regulating tank, the treatment capacity of the deep biological denitrification units is not increased, and resource consumption is further avoided.

Description

Sewage treatment device and method suitable for large-amplitude fluctuation of water quantity
Technical Field
the invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device and a sewage treatment method suitable for large water quantity fluctuation.
Background
Currently, the most widely used in the field of domestic sewage treatment is the activated sludge process and its variant processes. The basic principle is that sewage and various microorganism populations are continuously mixed and cultured under the condition of artificial oxygenation to form activated sludge; the biological coagulation, adsorption and oxidation of the activated sludge are utilized to decompose and remove organic pollutants in the sewage; then separating the sludge from the water, returning most of the sludge to the aeration tank, and discharging the rest of the sludge out of the activated sludge system. The variant processes of the activated sludge process comprise an anaerobic-anoxic-aerobic (AAO) process, an oxidation ditch process, a CASS process and the like, and through long-term development and improvement, the processes can achieve ideal removal effects on organic matters, nitrogen and phosphorus nutrient elements in municipal sewage.
However, these processes and methods generally aim at sewage treatment under the condition of uniform water supply, and when the urban area is small in scale and the discharge amount of domestic sewage is very uneven (especially for rural sewage discharge), a regulating tank with a large volume needs to be arranged to regulate the water supply, and a lift pump is used to quantitatively convey sewage to treatment equipment, so as to achieve a stable treatment effect. Thus greatly increasing the engineering investment of sewage treatment facilities; and the regulating tank needs regular cleaning and maintenance, which brings inconvenience to the normal operation of the sewage treatment facility. In addition, the sewage in small towns and rural areas generally has the characteristic of low ratio of organic pollutants to nitrogen and phosphorus nutrient salts, so that the biological nitrogen and phosphorus removal treatment is not thorough, and the current strict pollutant discharge standard cannot be met.
Disclosure of Invention
The invention aims to provide a sewage treatment device which is suitable for large fluctuation of water quantity, does not need to be provided with a regulating tank, reduces engineering investment and can effectively remove pollutants and denitrify sewage.
in order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a sewage treatment plant suitable for water yield fluctuates by a wide margin, includes the activated sludge biological reaction unit of direct introduction sewage, still includes a plurality of degree of depth biological denitrification units, and is a plurality of degree of depth biological denitrification unit inserts in turn the activated sludge biological reaction unit is with the activated sludge mixed liquid of setting for the flow supply, activated sludge biological reaction unit changes the water level according to sewage inflow self-adaptation, the upper portion and the lower part correspondence of degree of depth biological denitrification unit and net water district and sludge thickening pond intercommunication.
Optionally, the activated sludge biological reaction unit is an AAO reaction tank, and includes an anaerobic tank, an anoxic tank and an aerobic tank which are sequentially communicated, sewage is directly introduced into the anaerobic tank, and an air lift pump is arranged between the aerobic tank and the deep biological denitrification unit.
Optionally, the number of the deep biological denitrification units is two, each deep biological denitrification unit comprises a water inlet stage, a mixed reaction stage and a standing stage, and when one deep biological denitrification unit is in the mixed reaction stage and the standing stage, the other deep biological denitrification unit is in the water inlet stage; in the water inlet stage, the aerobic tank supplies activated sludge mixed liquid to the deep biological denitrification unit through the air stripping pump, meanwhile, supernatant obtained in the deep biological denitrification unit in the mixed reaction stage and the standing stage overflows to the water purification area, and sludge precipitated at the bottom is discharged to the sludge concentration tank; an aeration device arranged at the bottom of the deep biological denitrification unit is periodically opened and closed in the mixing reaction stage, sludge at the bottom is swept to be uniformly mixed with the treated water, and the deep denitrification reaction is completed; and in the standing stage, the deep biological denitrification unit stops aeration and purging and only carries out natural sedimentation.
Optionally, the water purification district, two degree of depth biological denitrification unit sludge thickening pond the anaerobism pond reaches the oxygen deficiency pond is arranged in order and is arranged, good oxygen pond is the U type form and encloses and establish sludge thickening pond the anaerobism pond reaches the periphery in oxygen deficiency pond, the U type form the both ends in good oxygen pond pass through the air lift pump respectively with two degree of depth biological denitrification unit intercommunication.
optionally, a nitrifying liquid return pipe is arranged between the aerobic tank and the anoxic tank.
Optionally, the lower part of the sludge concentration tank is connected with the anaerobic tank through a sludge return pipe, and the upper part of the sludge concentration tank is connected with the anaerobic tank through an overflow pipe.
Optionally, the water purification area is set as a sedimentation tank, and coagulant is added into the water purification area to complete chemical phosphorus removal.
optionally, a water outlet of the water purification area is provided with a tubular ultraviolet sterilizer.
the present invention also aims to provide a treatment method suitable for a sewage treatment apparatus with a large fluctuation of water volume, which can effectively remove pollutants and denitrify sewage.
In order to achieve the purpose, the invention adopts the following technical scheme: a treatment method suitable for a sewage treatment device with large fluctuation of water quantity comprises the following steps:
A. the sewage directly enters an activated sludge biological reaction unit to carry out anaerobic biological phosphorus removal reaction, anoxic biological nitrogen removal reaction, aerobic biological reaction or any combination biological reaction of the three;
B. The water level of the activated sludge biological reaction unit gradually rises in the peak period of water consumption, the water level of the activated sludge biological reaction unit continuously falls in the valley period of water consumption, and the plurality of deep biological denitrification units are alternately connected into the activated sludge mixed liquid supplied by the activated sludge biological reaction unit at a set flow rate;
C. activated sludge mixed liquor in the deep biological denitrification unit is subjected to endogenous respiration denitrification reaction, supernatant after standing overflows into a water purification area under the replacement of the activated sludge mixed liquor quantitatively supplied to the aerobic tank, and precipitated sludge enters a sludge concentration tank through a sludge lifting device.
In a plurality of continuous days, the average value of the sewage discharge in the water using peak period is Q1, the average value of the sewage discharge in the water using valley period is Q2, the activated sludge biological reaction unit supplies the set flow rate of the activated sludge mixed liquid to the deep biological denitrification unit every hour to obtain Q3, wherein Q2 is more than Q3 and less than Q1, the activated sludge biological reaction unit is pre-stored with quantitative sewage with activated sludge when running and starting, the sewage volume in the activated sludge biological reaction unit is always not lower than the effective volume V of the biological reaction area, and the value of Q3 is adaptively adjusted when the sewage volume in the activated sludge biological reaction unit is lower than V in the water using valley period.
Compared with the prior art, the method has the advantages that no regulating tank is arranged in front of the activated sludge biological reaction unit, land resources are not occupied, no maintenance is required for the regulating tank, manpower and material resources are not occupied, the deep biological denitrification unit is arranged behind the activated sludge biological reaction unit for deep denitrification, and the problem of low carbon and nitrogen content of sewage in small towns and rural areas is solved; the water level of the activated sludge biological reaction unit is changed in a self-adaptive manner, the activated sludge biological reaction unit supplies sewage to the plurality of deep biological denitrification units alternately at a set flow rate set by manual control all the time, and the effluent cannot change due to the sewage production amount, so that stable sewage treatment can be kept all the time under the condition of not adopting an adjusting tank, the treatment capacity of the deep biological denitrification unit is not increased, and the resource consumption is further avoided.
Drawings
FIG. 1 is a schematic view of a sewage treatment apparatus of the present invention.
Reference numerals:
1. an activated sludge biological reaction unit; 11. an anaerobic tank; 12. an anoxic tank; 13. an aerobic tank; 14. a nitrifying liquid return pipe; 2. a deep biological denitrification unit; 3. a water purification area; 4. a sludge concentration tank; 41. a sludge return pipe; 42. an overflow pipe; 5. a gas stripping pump.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in figure 1, the sewage treatment device is suitable for large fluctuation of water quantity, an activated sludge biological reaction unit 1 directly introduces sewage to carry out microbial treatment on the sewage, a plurality of deep biological denitrification units 2 are alternately connected into activated sludge mixed liquor of the activated sludge biological reaction unit 1 to carry out deep denitrification, the upper parts of the deep biological denitrification units 2 are communicated with a water purification area 3 to discharge supernatant, and the lower parts of the deep biological denitrification units 2 are communicated with a sludge concentration tank 4 to discharge precipitated sludge.
Compared with the prior art, the method has the advantages that no regulating tank is arranged in front of the activated sludge biological reaction unit 1, land resources are not occupied, no maintenance is required for the regulating tank, manpower and material resources are not occupied, the deep biological denitrification unit 2 is arranged behind the activated sludge biological reaction unit 1 for deep denitrification, and the problem of low carbon and nitrogen content of sewage in small towns and rural areas is solved; when the regulating tank is arranged, the activated sludge biological reaction unit 1 quantitatively feeds water and then quantitatively outputs the water to the denitrification treatment facility, namely the water feeding and the water discharging are equal, the regulating tank is not arranged, and when the sewage production amount is increased in a water peak time period, the regulating tank does not have the function, the sewage content in the conventional activated sludge biological reaction unit 1 is increased, the sewage flow rate is also increased, the reaction residence time of the sewage in the activated sludge biological reaction unit 1 is also shorter, pollutants can not be thoroughly removed, then the sewage is directly introduced into the denitrification treatment facility through an overflow port or a water outlet, namely, more water is fed in and more water is discharged, the sewage treatment capacity of the subsequent denitrification treatment facility is also increased, the corresponding denitrification treatment facility is required to be increased to deal with the condition that the sewage production amount is large, and obviously the engineering investment is consumed; however, in the present application, when the sewage generation amount is large, the water level of the activated sludge biological reaction unit 1 gradually rises, when the sewage generation amount is small, the water level of the activated sludge biological reaction unit 1 continuously falls, the water level of the activated sludge biological reaction unit 1 adaptively changes, the activated sludge biological reaction unit 1 alternately supplies sewage to the plurality of deep biological denitrification units 2 at a set flow rate set by manual control all the time, and the effluent does not change due to the sewage generation amount, so that stable sewage treatment can be always maintained without using a regulation tank, the treatment capacity of the deep biological denitrification units 2 does not need to be increased, and resource consumption is further avoided.
in some embodiments, as shown in fig. 1, the sludge biological reaction unit 1 may adopt a conventional anaerobic-anoxic-aerobic (AAO) process, an oxidation ditch process, a CASS process, etc., but when the application scene is small towns and rural areas, the sewage treatment capacity is generally not large, so an AAO reaction tank may be selected, which has a relatively simple structural configuration and includes an anaerobic tank 11, an anoxic tank 12 and an aerobic tank 13, which are sequentially connected, and the volume ratio of the three tanks may be 2: 3: 5, sewage is directly introduced into the anaerobic tank 11, and is supplied to the deep biological denitrification unit 2 from the aerobic tank 13 through the air stripping pump 5 at a set flow rate, so that the water inflow of the deep biological denitrification unit 2 cannot be influenced by water fluctuation.
in some embodiments, as shown in fig. 1, the deep biological denitrification unit 2 is provided with two deep biological denitrification units for performing deep denitrification on sewage in small towns and rural areas, and the deep biological denitrification unit 2 comprises a water inlet stage, a mixed reaction stage and a standing stage, as one embodiment, the operation cycle time is 3 hours, wherein the water inlet stage is 1.5 hours, the mixed reaction stage is 1 hour, and the standing stage is 0.5 hour, and when one deep biological denitrification unit 2 is in the mixed reaction stage and the standing stage, the other deep biological denitrification unit 2 is in the water inlet stage; in the water inlet stage, the aerobic tank 13 supplies activated sludge mixed liquid to the deep biological denitrification unit 2 through the air stripping pump 5, meanwhile, supernatant obtained in the deep biological denitrification unit 2 in the mixed reaction stage and the standing stage overflows to the water purification area 3, and sludge precipitated at the bottom is discharged to the sludge concentration tank 4; the aeration device arranged at the bottom of the deep biological denitrification unit 2 is periodically opened and closed in the mixed reaction stage, sludge at the bottom is swept to carry out mixed reaction, the optional scheme is that aeration is carried out for 0.5-1 min and pause is carried out for 5-8 min, dissolved oxygen is maintained below 0.5mg/l, activated sludge in sewage can be uniformly mixed with sewage in the aeration sweeping process, the deep biological denitrification unit 2 is ensured to have a good denitrification deep denitrification effect, and the deep biological denitrification unit 2 stops aeration sweeping and only carries out natural sedimentation in the standing stage.
In some embodiments, as shown in fig. 1, the arrangement of the present invention is to reasonably utilize land resources, so that the whole sewage treatment plant has a reasonable and compact structure, and as one of the preferred solutions, the arrangement is as follows: the water purification area 3, the two deep biological denitrification units 2, the sludge concentration tank 4, the anaerobic tank 11 and the anoxic tank 12 are sequentially arranged, the aerobic tank 13 is U-shaped and is arranged around the periphery of the sludge concentration tank 4, the anaerobic tank 11 and the anoxic tank 12, and two ends of the U-shaped aerobic tank 13 are respectively communicated with the two deep biological denitrification units 2 through the air lift pump 5.
In some embodiments, as shown in fig. 1, a nitrifying liquid return pipe 14 is arranged between the aerobic tank 13 and the anoxic tank 12, so that nitrite nitrogen and nitrate nitrogen in the nitrifying liquid are returned from the aerobic tank 13, and are reduced into nitrogen gas by the action of denitrifying bacteria under the condition of sufficient supply of anoxic and organic carbon sources, and the nitrogen gas is discharged out of the sewage treatment system.
In some embodiments, as shown in fig. 1, the lower part of the sludge concentration tank 4 is connected to the anaerobic tank 11 through a sludge return pipe 41, and the purpose of returning sludge is to maintain a certain concentration of suspended solids, that is, a certain concentration of microorganisms, in the activated sludge bioreactor 1; the upper part of the sludge concentration tank 4 is connected with the anaerobic tank 11 through the overflow pipe 42, and the lower part of the deep biological denitrification unit 2 is bound to be mixed with some sewage when the settled sludge is discharged to the sludge concentration tank 4, so that the sewage in the sludge concentration tank 4 enters the anaerobic tank 11 through the overflow pipe 42 to be subjected to sewage treatment again, and the sewage can be used for supplementing the sewage to the anaerobic tank 11 when the sewage production amount is small.
In some embodiments, the water purification area 3 is set as a sedimentation tank, and coagulant is added into the water purification area 3. According to the TP discharge index of the effluent, a proper amount of polyaluminium chloride can be added for chemical phosphorus removal, and the coagulation effect is exerted at the same time, so that the suspended matters in water are further removed in the water purification area 3.
in some embodiments, the water outlet of the water purification area 3 is provided with a tubular ultraviolet sterilizer for further sterilizing the outlet water.
A treatment method suitable for a sewage treatment device with greatly fluctuated water quantity comprises the following steps: the method comprises the following steps:
A. The sewage directly enters an activated sludge biological reaction unit 1 to carry out anaerobic biological phosphorus removal reaction, anoxic biological nitrogen removal reaction, aerobic biological reaction or any combination biological reaction of the three, and the activated sludge biological reaction unit 1 can be an AAO reaction tank;
B. The water level of the activated sludge biological reaction unit 1 gradually rises in the peak period of water consumption, the water level of the activated sludge biological reaction unit 1 continuously falls in the valley period of water consumption, and the plurality of deep biological denitrification units 2 are alternately connected into the activated sludge mixed liquid supplied by the activated sludge biological reaction unit 1 at a set flow rate;
C. The activated sludge mixed liquor in the deep biological denitrification unit 2 is subjected to endogenous respiration denitrification reaction, the supernatant after standing overflows into the water purification area 3 under the replacement of the activated sludge mixed liquor quantitatively supplied by the aerobic tank 13, and the precipitated sludge enters the sludge concentration tank 4 through the sludge lifting device.
In small towns and rural areas, the sewage amount in three time periods of 6: 00-8: 00, 12: 00-14: 00 and 18: 00-20: 00 can account for more than 60% of the total amount of the whole day, the average value of the sewage generation amount flow in the time period is Q1, the average value of the sewage generation amount flow in other time periods is Q2, the active sludge biological reaction unit 1 supplies the sewage to the deep biological denitrification unit 2 every hour, the set flow value Q3 is provided, wherein Q2< Q3< Q1, Q3 is provided as the average value of Q1 and Q2, the deep denitrification treatment of the sewage is ensured as much as possible on the premise that the volume of the deep biological denitrification unit 2 is not too large, the active sludge biological reaction unit 1 is pre-stored with quantitative active sludge when running and the sewage volume in the active sludge biological reaction unit 1 is always not lower than the effective volume V of a biological reaction area, namely, a certain microorganism concentration is kept and a certain microorganism survival amount is ensured, so that the AAO reaction can be normally and effectively carried out;
During the operation of the device of the invention, two situations can exist:
Firstly, in the sewage discharge peak period Q3< Q1, at the moment, the activated sludge mixed liquor is lifted to enter the deep denitrification reaction zone 2 at a constant flow rate Q3, and the difference value between the equipment water inflow Q1 and the equipment water inflow Q3 is stored in the activated sludge biological reaction unit 1, so that the water level is continuously raised, and the impact on a biological reaction system when the equipment water inflow is large can be counteracted in such a way, so that the stable operation of the system is ensured;
Secondly, in the low-ebb period of sewage discharge, Q2 is less than Q3, at the moment, the activated sludge mixed liquor is lifted into the deep denitrification reaction zone 2 at a constant flow rate Q3, the equipment water inflow Q2 is not enough to maintain the water level in the activated sludge biological reaction unit 1 to be constant, so that the water level of the activated sludge biological reaction unit 1 is gradually reduced, and the spare volume can be used as a buffer for the large sewage discharge; in addition, when the sewage generation amount is small, the activated sludge biological reaction unit 1 supplies sewage to the deep biological denitrification unit 2 at the set flow rate Q3, the sewage volume in the sludge biological reaction unit 1 is continuously reduced and the situation that the sewage volume is possibly lower than V can occur, and the value of Q3 can be adaptively reduced in the water use valley period, so that the sludge biological reaction unit 1 is prevented from being excessively quickly reduced.
The water level of the activated sludge biological reaction unit 1 can be changed in a self-adaptive manner to store sewage, then the sewage is quantitatively supplied to the deep biological denitrification unit 2 through the air lift pump 5 or other water supply devices, so that the sewage can be treated normally when the water quantity fluctuates without adopting an adjusting tank, the reflux ratio of the nitrification liquid reflux pipe 14 and the reflux ratio of the sludge reflux pipe 41 are set, Q3 is set in advance respectively in a water consumption peak period and a water consumption valley period to ensure that the deep biological denitrification unit 2 is treated stably all the time, the automatic treatment of the whole sewage treatment device can be realized through the arrangement, and the manpower can be released.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a sewage treatment plant suitable for water yield fluctuates by a wide margin which characterized in that: including activated sludge biological reaction unit (1) of direct introduction sewage, still include a plurality of degree of depth biological denitrification units (2), it is a plurality of degree of depth biological denitrification unit (2) insert in turn activated sludge biological reaction unit (1) is with the activated sludge mixed liquid that sets for the flow supply, activated sludge biological reaction unit (1) is according to sewage inflow self-adaptation change water level, the upper portion and the lower part correspondence of degree of depth biological denitrification unit (2) communicate with clean water district (3) and sludge thickening pond (4).
2. the sewage treatment device suitable for large water amount fluctuation according to claim 1, wherein: activated sludge biological reaction unit (1) is the AAO reaction tank, and it is including anaerobic tank (11), oxygen deficiency pond (12) and good oxygen pond (13) that communicate in proper order and arrange, sewage is directly introduced in anaerobic tank (11), good oxygen pond (13) with be provided with air lift pump (5) between degree of depth biological denitrification unit (2).
3. The sewage treatment device suitable for large water amount fluctuation according to claim 2, wherein: the number of the deep biological denitrification units (2) is two, the deep biological denitrification units (2) comprise a water inlet stage, a mixed reaction stage and a standing stage, and when one deep biological denitrification unit (2) is in the mixed reaction stage and the standing stage, the other deep biological denitrification unit (2) is in the water inlet stage; in the water inlet stage, the aerobic tank (13) supplies activated sludge mixed liquor to the deep biological denitrification unit (2) through the air stripping pump (5), meanwhile, supernatant obtained in the deep biological denitrification unit (2) in the mixing reaction stage and the standing stage overflows to the water purification area (3), and sludge precipitated at the bottom is discharged to the sludge concentration tank (4); an aeration device arranged at the bottom of the deep biological denitrification unit (2) is periodically opened and closed in the mixing reaction stage, sludge at the bottom is swept to be uniformly mixed with the treated water, and the deep denitrification reaction is completed; and in the standing stage, the deep biological denitrification unit (2) stops aeration and purging and only carries out natural sedimentation.
4. The sewage treatment device suitable for large water amount fluctuation according to claim 3, wherein: water purification district (3), two degree of depth biological denitrification unit (2) sludge thickening tank (4) anaerobism pond (11) reach oxygen deficiency pond (12) are arranged in order and are arranged, good oxygen pond (13) are the U type form and enclose to establish sludge thickening tank (4) anaerobism pond (11) reach the periphery of oxygen deficiency pond (12), the U type form the both ends of good oxygen pond (13) are passed through air stripping pump (5) respectively with two degree of depth biological denitrification unit (2) intercommunication.
5. The sewage treatment device suitable for large water amount fluctuation according to claim 2, wherein: a nitrifying liquid return pipe (14) is arranged between the aerobic tank (13) and the anoxic tank (12).
6. The sewage treatment device suitable for large water amount fluctuation according to claim 2, wherein: the lower part of the sludge concentration tank (4) is connected with the anaerobic tank (11) through a sludge return pipe (41), and the upper part of the sludge concentration tank (4) is connected with the anaerobic tank (11) through an overflow pipe (42).
7. The sewage treatment device suitable for large water amount fluctuation according to claim 1, wherein: the water purification area (3) is set as a sedimentation tank, and coagulant is added into the water purification area (3) to complete chemical phosphorus removal.
8. The sewage treatment apparatus adapted to large fluctuation of water amount according to claim 7, wherein: a water outlet of the water purification area (3) is provided with a tubular ultraviolet sterilizer.
9. A treatment method suitable for a sewage treatment device with greatly fluctuated water quantity is characterized by comprising the following steps: the method comprises the following steps:
A. The sewage directly enters an activated sludge biological reaction unit (1) to carry out anaerobic biological phosphorus removal reaction, anoxic biological nitrogen removal reaction, aerobic biological reaction or any combination biological reaction of the three;
B. The water level of the activated sludge biological reaction unit (1) is gradually increased in the peak period of water consumption, the water level of the activated sludge biological reaction unit (1) is continuously decreased in the valley period of water consumption, and the plurality of deep biological denitrification units (2) are alternately connected into the activated sludge mixed liquid supplied by the activated sludge biological reaction unit (1) at a set flow rate;
C. Activated sludge mixed liquor in the deep biological denitrification unit (2) is subjected to endogenous respiration denitrification reaction, supernatant after standing overflows into a water purification area (3) under the replacement of the activated sludge mixed liquor quantitatively supplied by the aerobic tank (13), and precipitated sludge enters a sludge concentration tank (4) through a sludge lifting device.
10. The processing method according to claim 9, characterized in that: in a plurality of continuous days, the average value of the sewage discharge in the water using peak period is Q1, the average value of the sewage discharge in the water using valley period is Q2, the activated sludge biological reaction unit (1) supplies the set flow rate of the activated sludge mixed liquid to the deep biological denitrification unit (2) every hour to obtain Q3, wherein Q2 is more than Q3 and less than Q1, the activated sludge biological reaction unit (1) is pre-stored with quantitative activated sludge sewage when running and starting, the sewage volume in the activated sludge biological reaction unit (1) is always not lower than the effective volume V of a biological reaction zone, and in the water using valley period, if the sewage volume in the activated sludge biological reaction unit (1) is lower than V, the value of Q3 is adaptively adjusted.
CN201910787979.4A 2019-08-26 2019-08-26 Sewage treatment device and method suitable for large-amplitude fluctuation of water quantity Pending CN110540293A (en)

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CN110980952A (en) * 2019-12-26 2020-04-10 西安建筑科技大学 Villages and small towns sewage infiltration pond
CN111847773A (en) * 2020-07-10 2020-10-30 珠海九通水务股份有限公司 Sewage treatment process based on multifunctional pool

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