CN112939210A - Integrated sewage treatment device and method utilizing carbon capture and aerobic granular sludge - Google Patents
Integrated sewage treatment device and method utilizing carbon capture and aerobic granular sludge Download PDFInfo
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- CN112939210A CN112939210A CN202110165804.7A CN202110165804A CN112939210A CN 112939210 A CN112939210 A CN 112939210A CN 202110165804 A CN202110165804 A CN 202110165804A CN 112939210 A CN112939210 A CN 112939210A
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
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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 an integrated sewage treatment device and method by utilizing carbon capture and aerobic granular sludge; the sewage treatment device comprises a carbon capture unit and an aerobic granular sludge unit, wherein a water inlet device is arranged at the lower part of the carbon capture unit, a water drainage device is arranged at the upper part or the middle part of the aerobic granular sludge unit, a first aeration device is arranged at the bottom of the carbon capture unit, a second aeration device is arranged at the bottom of the aerobic granular sludge unit, and a circulating device is arranged in the aerobic granular sludge unit. The invention can strengthen the formation of aerobic granular sludge, effectively treat pollutants in sewage and ensure the quality of effluent.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an integrated sewage treatment device and method utilizing carbon capture and aerobic granular sludge.
Background
The aerobic granular sludge mainly comprises nitrifying bacteria, denitrifying bacteria, phosphorus accumulating bacteria and polysaccharide bacteria, so that the aerobic granular sludge has the performance of synchronously removing carbon and nitrogen in one reaction unit. For a biological treatment system, the treatment effect of the biological membrane is better than that of suspended activated sludge, and the aerobic granular sludge can be regarded as a special biological membrane formed by cell self-aggregation to a certain extent, so that the biological membrane has the advantages of the biological membrane and the activated sludge, namely good sedimentation performance and high biological activity. The good sedimentation performance is beneficial to the separation of mud and water, thereby saving a sludge secondary sedimentation tank, simplifying the process flow, reducing the building area and investment, and ensuring the treatment effect of the effluent quality by high biological activity.
However, the aerobic granular sludge technology is difficult to be applied to large-scale sewage treatment, particularly, the aerobic granular sludge has a long culture period, the culture process is unstable, the granules are easy to disintegrate, the disintegrated aerobic granular sludge system not only reduces the sewage treatment efficiency, but also generates floccule sludge which further causes the secondary pollution problem of suspended matters in the sewage, and the application of the aerobic granular sludge technology in the sewage treatment field is greatly limited.
The Chinese patent with the publication number of CN104828944B discloses a hydrolysis-aerobic granular sludge integrated sewage treatment system and a method, and the system is provided with a hydrolysis acidification zone, a regulation zone and an aerobic granular sludge zone with internal water flow circulation.
Although the hydrolysis acidification process can reduce partial pollutant load under the condition of no energy consumption, the water in a hydrolysis acidification zone and a regulation zone is in a non-aerobic state at the cost of land occupation, and when entering an aerobic granular sludge zone from the lower part, the water has negative influence on the adaptation of the aerobic granular sludge, so that the aerobic granular sludge is easy to disintegrate; in addition, the circulation of the water flow inside the guide cylinder is realized by the difference of the densities of the liquid inside and outside the guide cylinder caused by aeration, and the proper adaptation of the aeration intensity and the circulation intensity is difficult to achieve.
Disclosure of Invention
In view of the above, the present invention provides an integrated sewage treatment apparatus and method using carbon capture and aerobic granular sludge, which can enhance the formation of aerobic granular sludge, effectively treat pollutants in sewage, and ensure the quality of effluent.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention discloses an integrated sewage treatment device utilizing carbon capture and aerobic granular sludge, which comprises a carbon capture unit and an aerobic granular sludge unit; the lower part of the carbon capture unit is provided with a water inlet device, the upper part of the carbon capture unit is communicated with the upper part of the aerobic granular sludge unit through an overflow port, and the upper part or the middle part of the aerobic granular sludge unit is provided with a drainage device; the bottom of the carbon capture unit is provided with a first aeration device, and the bottom of the aerobic granular sludge unit is provided with a second aeration device; the aerobic granular sludge unit is provided with a circulating device, the circulating device comprises a circulating pipe and a circulating pump arranged on the circulating pipe, the inlet end of the circulating pipe is communicated with the middle part of the aerobic granular sludge unit, and the outlet end of the circulating pipe is communicated with the lower part of the aerobic granular sludge unit.
Preferably, the drainage device is positioned above the inlet end of the circulating pipe.
Preferably, the water inlet device is communicated with a water inlet pump, and the water discharge device is communicated with a water discharge pump.
Preferably, the first aeration device and the second aeration device are respectively communicated with the aerator.
As a preferred technical scheme, the sewage treatment device further comprises a time controller, and the time controller is used for controlling the running time of the water inlet pump, the drainage pump, the aerator and the circulating pump.
The invention also discloses a method for treating sewage by using the sewage treatment device, which comprises the following steps:
(1) inoculating aerobic sludge into a carbon capture unit and an aerobic granular sludge unit;
(2) inputting sewage into the lower part of the carbon capture unit through a water inlet device, and overflowing the sewage from the upper part into the aerobic granular sludge unit after the sewage is treated by microorganisms in the carbon capture unit;
(3) after water is fed, starting the first aeration device and the second aeration device to respectively aerate the carbon capture unit and the aerobic granular sludge unit, and simultaneously starting the circulating device to feed muddy water in the middle of the aerobic granular sludge unit to the lower part to form water flow circulation;
(4) after the aeration is finished, stopping aeration and circulation to precipitate sludge;
(5) after the sedimentation is finished, discharging water at the upper part or the middle part of the aerobic granular sludge unit through a drainage device to finish an operation cycle;
(6) and (5) repeating the steps (2) to (5) and carrying out the next operation period.
Preferably, in the step (1), the ratio of the sludge inoculation amount of the carbon capture unit to the aerobic granular sludge unit is 0.8-1.2.
As a preferable technical scheme, the water inlet time of the step (2) is 15-20min, the aeration and circulation time of the step (3) is 100-150min, the precipitation time of the step (4) is 15-20min, and the water drainage time of the step (5) is 10-15 min.
The invention has the beneficial effects that:
1. according to the invention, the carbon capture unit is arranged in front of the aerobic granular sludge unit, the bottom of the carbon capture unit is continuously aerated, so that microorganisms adaptive to the retention time of the unit, the types of raw water pollutants and organic loads are continuously bred and preferentially grown, under the action of extracellular polymer, a large amount of carbon-containing organic matters in raw water are continuously adsorbed and captured, and are subjected to primary degradation, the large-molecular carbon-containing organic matters are degraded into small-molecular organic matters, the biodegradability is increased, and conditions are created for the formation of aerobic granular sludge in subsequent units.
2. The invention aerates at the bottom of the aerobic granular sludge unit, absorbs water from the low-concentration sludge layer at the upper part of the aeration reaction zone, circularly pumps the water into the high-concentration sludge layer at the lower part, strengthens mass transfer, strengthens the shearing action of water flow on sludge, strengthens the formation of aerobic granular sludge, ensures that the aerobic granular sludge has shorter culture period, stable culture process and difficult disintegration of the aerobic granular sludge, can effectively treat pollutants in sewage and ensures the quality of effluent.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic view showing the construction of an integrated sewage treatment apparatus using carbon capture and aerobic granular sludge.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
As shown in fig. 1, an integrated sewage treatment plant using carbon capture and aerobic granular sludge comprises a carbon capture unit 1 and an aerobic granular sludge unit 2; the lower part of the carbon capture unit 1 is provided with a water inlet device 3, the water inlet device 3 is communicated with a water inlet pump 4, the upper part of the carbon capture unit 1 is communicated with the upper part of the aerobic granular sludge unit 2 through an overflow port 5, the upper part or the middle part of the aerobic granular sludge unit 2 is provided with a drainage device 6, and the drainage device 6 is communicated with a drainage pump 7; the bottom of the carbon capture unit 1 is provided with a first aeration device 8, the bottom of the aerobic granular sludge unit 2 is provided with a second aeration device 9, and the first aeration device 8 and the second aeration device 9 are respectively communicated with an aerator 10; the aerobic granular sludge unit 2 is provided with a circulating device, the circulating device comprises a circulating pipe 11 and a circulating pump 12 arranged on the circulating pipe 11, the inlet end of the circulating pipe 11 is communicated with the middle part of the aerobic granular sludge unit 2, and the outlet end of the circulating pipe 11 is communicated with the lower part of the aerobic granular sludge unit 2.
The drainage device 6 is positioned above the inlet end of the circulating pipe 11, so that the loss of aerobic granular sludge during drainage is reduced.
The sewage treatment apparatus further includes a time controller 13, and the time controller 13 is configured to control operation times of the water inlet pump 4, the water discharge pump 7, the aerator 10, and the circulation pump 12.
A method for treating sewage by using the sewage treatment device comprises the following steps:
(1) taking return sludge of a secondary sedimentation tank of a sewage plant, and inoculating the sludge into a carbon capture unit 1 and an aerobic granular sludge unit 2, wherein MLSS is 3000-4000 mg/L; the carbon capture unit 1 contains about 50% inoculated sludge and the aerobic granular sludge unit 2 contains about 50% inoculated sludge;
(2) taking domestic sewage, wherein COD is 320-370mg/L, total nitrogen is 35-41mg/L, total phosphorus is 8-10mg/L, and pH is 6-8; sewage is input into the lower part of the carbon capture unit 1 through the water inlet device 3, and overflows from the upper part into the aerobic granular sludge unit 2 after being treated by microorganisms in the carbon capture unit 1;
(3) after water is fed, starting the first aeration device 8 and the second aeration device 9 to respectively aerate the carbon capture unit 1 and the aerobic granular sludge unit 2, and simultaneously starting the circulating device to feed muddy water in the middle of the aerobic granular sludge unit 2 to the lower part to form water flow circulation;
(4) after the aeration is finished, stopping aeration and circulation to precipitate sludge;
(5) after the precipitation is finished, discharging water at the upper part or the middle part of the aerobic granular sludge unit 2 through a drainage device 6 to finish an operation cycle;
(6) and (5) repeating the steps (2) to (5) and carrying out the next operation period.
The operation period is 2.5h, and the time distribution of each stage is water inlet for 15min, aeration and circulation for 110min, sedimentation for 15min and water drainage for 10 min. After stable operation for 25 days, COD effluent is lower than 37mg/L, total nitrogen of effluent is lower than 8mg/L, and total phosphorus of effluent is lower than 0.3 mg/L.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The utility model provides an utilize integration sewage treatment plant of carbon capture and aerobic granule mud which characterized in that: the sewage treatment device comprises a carbon capture unit and an aerobic granular sludge unit;
the lower part of the carbon capture unit is provided with a water inlet device, the upper part of the carbon capture unit is communicated with the upper part of the aerobic granular sludge unit through an overflow port, and the upper part or the middle part of the aerobic granular sludge unit is provided with a drainage device;
the bottom of the carbon capture unit is provided with a first aeration device, and the bottom of the aerobic granular sludge unit is provided with a second aeration device;
the aerobic granular sludge unit is provided with a circulating device, the circulating device comprises a circulating pipe and a circulating pump arranged on the circulating pipe, the inlet end of the circulating pipe is communicated with the middle part of the aerobic granular sludge unit, and the outlet end of the circulating pipe is communicated with the lower part of the aerobic granular sludge unit.
2. The sewage treatment apparatus of claim 1, wherein: the drainage device is positioned above the inlet end of the circulating pipe.
3. The sewage treatment apparatus of claim 1, wherein: the water inlet device is communicated with the water inlet pump, and the water discharge device is communicated with the water discharge pump.
4. The sewage treatment apparatus of claim 3, wherein: the first aeration device and the second aeration device are respectively communicated with the aerator.
5. The sewage treatment apparatus of claim 4, wherein: the sewage treatment device also comprises a time controller, and the time controller is used for controlling the running time of the water inlet pump, the drainage pump, the aerator and the circulating pump.
6. A method for sewage treatment using the sewage treatment apparatus according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
(1) inoculating aerobic sludge into a carbon capture unit and an aerobic granular sludge unit;
(2) inputting sewage into the lower part of the carbon capture unit through a water inlet device, and overflowing the sewage from the upper part into the aerobic granular sludge unit after the sewage is treated by microorganisms in the carbon capture unit;
(3) after water is fed, starting the first aeration device and the second aeration device to respectively aerate the carbon capture unit and the aerobic granular sludge unit, and simultaneously starting the circulating device to feed muddy water in the middle of the aerobic granular sludge unit to the lower part to form water flow circulation;
(4) after the aeration is finished, stopping aeration and circulation to precipitate sludge;
(5) after the sedimentation is finished, discharging water at the upper part or the middle part of the aerobic granular sludge unit through a drainage device to finish an operation cycle;
(6) and (5) repeating the steps (2) to (5) and carrying out the next operation period.
7. The method of claim 6, wherein: in the step (1), the sludge inoculation amount ratio of the carbon capture unit and the aerobic granular sludge unit is 0.8-1.2.
8. The method of claim 6, wherein: the water inlet time of the step (2) is 15-20min, the aeration and circulation time of the step (3) is 100-150min, the precipitation time of the step (4) is 15-20min, and the water drainage time of the step (5) is 10-15 min.
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