CN114100361A - A CO2 capture and utilization system in aeration tank of sewage treatment plant - Google Patents
A CO2 capture and utilization system in aeration tank of sewage treatment plant Download PDFInfo
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- CN114100361A CN114100361A CN202111294449.XA CN202111294449A CN114100361A CN 114100361 A CN114100361 A CN 114100361A CN 202111294449 A CN202111294449 A CN 202111294449A CN 114100361 A CN114100361 A CN 114100361A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/95—Specific microorganisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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Abstract
The invention discloses a CO aeration tank of a sewage treatment plant2The trapping and utilizing system comprises a biological aeration tank, a supporting material layer, a polyimide-based composite film layer, a microalgae suspension layer and a transparent hard resin layer. The supporting material layer is arched and is positioned above the biological aeration tank, and the polyacyl composite film layer is laid on the supporting material layer and is used for CO2Selective passage of gas; the microalgae suspension layer is laid on the polyacyl composite membrane layer; the transparent hard resin layer is laid on the microalgae suspension layer. The invention is creatively aimed at CO in the special occasion of the aeration tank2The emission, trapping and utilization provides a combined process of a trapping cover and microalgae absorption, and overcomes the defect of CO in the flue gas of the traditional power plant2The gas trapping and utilizing process is directly transferred to the existing problem of 'large and small materials', and the system has strong pertinence and good practicability.
Description
Technical Field
The invention relates to CO2The technical field of trapping and utilization, in particular to an aeration tank CO of a sewage treatment plant2A trap utilization system.
Background
In recent years, carbon dioxide (CO) has been used as a source of carbon dioxide2) Global warming caused by isothermal chamber gas emission is increasingly remarkable, and a series of serious consequences such as frequent extreme weather and rise of sea level are caused. Therefore, greenhouse gas emission reduction has become one of the international social hot topics nowadays. The sewage is an important greenhouse gas emission source, and CO discharged by sewage treatment plants all over the world2The amount can reach CO 23% of the total amount of emissions. In the sewage treatment process, the degradation and conversion of carbon (C) and nitrogen (N) containing pollutants are accompanied by methane (CH)4) Dinitrogen monoxide (N)2O), carbon dioxide (CO)2) Etc. generation and release of gases. In addition to this, sewage treatment facilities consume large amounts of electricity and chemicals, which indirectly also results in CO2And (4) discharging. The sewage yield and treatment scale of China are at the top of the world and are increasing continuously. In 2015, the direct carbon emission amount generated by Chinese sewage treatment is 2512.2 ten thousand tons of CO2Equivalent weight and power consumption to generate indirect carbon emission of 1401.6 ten thousand tons of CO2Equivalent weight, indirect carbon emission generated by medicament consumption is 70.9 ten thousand tons of CO2Equivalent weight, 3984.7 ten thousand tons CO in total2And (3) equivalent weight. Relevant researches show that if the current sewage treatment process is continued, the total carbon emission of the whole sewage treatment industry in China reaches 3.65 hundred million tons of CO by 20302Equivalent, accounting for 2.95% of the total national discharge. Therefore, the CO discharged by the sewage treatment industry2The amount is considerable.
Whereas in sewage treatment plants the most dominant carbon discharge point is in the aeration basin. Continuously discharging CO from the aeration tank in a closed environment2CO above it2The concentration can be obviously higher than that of air (reaching CO in the air)23-5 times of the concentration), but the total emission amount and concentration are far lower than the smoke emitted by a common coal-fired power plant. Therefore, the CO discharged from the aeration tank is utilized2The chemical absorption method for treating the high-emission and high-concentration flue gas is not economical.
In the prior art, patent documents CN102688678A and CN207076317U are reportedAiming at CO in flue gas2Using equipment, but for CO in the vicinity of the aeration tank2The collection and utilization of gas have been studied relatively rarely, and for example, patent document CN102849758A provides CO in a biological aeration tank2A device for collecting and utilizing the collected CO2Gas reacts with NaOH to generate NaHCO3The trapping and utilizing device is complicated and has low utilization efficiency. For CO near the aeration tank2The capture and utilization of gases is not well studied. Based on the above, the invention provides the development of CO in the aeration tank of the sewage treatment plant2Concept of trapping, development of "trapping cover (microalgae absorption) for trapping CO2The technology aims to solve the problem of carbon emission of sewage treatment plants and achieve the aim of carbon neutralization.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a CO aeration tank of a sewage treatment plant2A capture utilization system for absorbing CO by photosynthesis of microalgae in the capture utilization system2The problem that a sewage treatment plant directly discharges carbon dioxide into the atmosphere is solved, so that the aims of reducing carbon emission and realizing carbon neutralization are fulfilled.
In order to achieve the purpose, the invention adopts the following technical scheme:
aeration tank CO of sewage treatment plant2A capture utilization system comprising: the device comprises a biological aeration tank, a supporting material layer, a polyimide-based composite film layer, a microalgae suspension layer and a transparent hard resin layer;
the support material layer is arched and is positioned above the biological aeration tank, is used for supporting the system and forming a closed space, and prevents CO generated by the aeration tank2Directly enters the atmosphere;
the polyacyl composite film layer is laid on the support material layer and used for CO2Selective passage of gas;
the microalgae suspension layer is laid on the polyacyl composite membrane layer and used for CO2Absorbing and utilizing gas;
the transparent hard resin layer is laid on the microalgae suspension layer and used for light transmission and system protection.
As a further preferred aspect of the present invention, the support material layer includes porous plastic and an arch-shaped support structure.
As a further preferable mode of the present invention, the porous plastic is laid on the arch-shaped support structure.
As a further preferable mode of the technical solution of the present invention, the porous plastic is PVC porous plastic.
As a further preferable mode of the technical solution of the present invention, the material of the polyimide-based composite membrane layer is a polyimide hollow fiber membrane.
In a further preferred embodiment of the present invention, the material of the transparent hard resin layer is a transparent hard epoxy resin.
Compared with the prior art, the invention has the following beneficial effects:
with direct CO capture in air2In contrast, the present invention converts CO2The capture range is directly reduced to a sewage treatment plant, and CO is captured and utilized by the capture and utilization system2CO is enriched above the aeration tank2The micro-algae enters the micro-algae suspension liquid through the porous plastic and the polyimide-based composite membrane, and is absorbed by the micro-algae through photosynthesis, so that the trapping efficiency is improved; the microalgae is adopted for absorption, so that the use of a conventional chemical absorbent is avoided, the environment is protected, the desorption process does not exist, the energy consumption is less, and the trapping cost is reduced; microalgae absorbing CO2And then the yield is increased, and the collected product can be used in the industries of food, chemical industry and the like, such as feed preparation, food additives, cosmetics and the like, and can generate economic benefits in a short time.
In conclusion, the invention is creatively directed to CO in the special case of an aeration tank2The discharge and the trapping are utilized to provide a trapping system (a trapping cover) and microalgae absorption combined process, thereby overcoming the defect that the CO in the flue gas of the traditional power plant is absorbed by2The gas trapping and utilizing process is directly transferred to the existing problem of 'large and small materials', and the system has strong pertinence and good practicability.
Drawings
FIG. 1 is a schematic view of the structure of a trapping and utilizing system of the present invention;
FIG. 2 is a schematic diagram showing a partial enlarged structure of the system A according to the present invention.
Wherein, 1, a biological aeration tank; 2. a layer of support material; 3. a polyacyl composite film layer; 4. a microalgae suspension layer; 5. a transparent hard resin layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly illustrated, the present invention will be further explained in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1 and 2, an aeration tank CO of a sewage treatment plant2A capture utilization system comprising: the device comprises a biological aeration tank 1, a support material layer 2, a polyimide-based composite film layer 3, a microalgae suspension layer 4 and a transparent hard resin layer 5;
the support material layer 2 is arched and is positioned above the biological aeration tank 1, is used for supporting a system and forming a closed space, and prevents CO generated by the aeration tank2Directly enters the atmosphere; the supporting material layer 2 is formed by PVC porous plastic (not shown in the figure) and an arched supporting structure (not shown in the figure), and the PVC porous plastic is laid on the arched supporting structure; through the arrangement of the support material layer, on one hand, the support function can be realized, and on the other hand, the free exchange and passing of the gas in the system are realized by limiting the gas discharged by the aeration tank into the system; in the embodiment, an arched bracket structure can be built above the aeration tank for placing PVC porous plastic, and the porous plastic and the arched support structure play a supporting role together to ensure the safety and stability of the trapping and utilizing system; the arch-shaped support structure can be a steel structure, and the embodiment does not specifically limit the specific selection;
the polyacyl composite film layer 3 is laid on the support material layer and used for CO2Selective passage of gas; the material of the polyacyl composite membrane layer 3 is a polyimide hollow fiber membrane, and CO is allowed2Selective passage of gas;
the microalgae suspension layer 4 is laid on the polyacyl composite membrane layer and used for CO2Absorbing and utilizing gas; in this example, microThe algae suspension layer is composed of microalgae arranged on the polyimide-based composite film layer, and can realize CO photosynthesis by using sunlight2Absorbing and utilizing gas; it is particularly emphasized that microalgae needs to be supplemented and monitored regularly, so that the normal activity of the microalgae is ensured, and the phenomenon of massive death of the microalgae is prevented.
In this embodiment, the microalgae suspension layer 4 may be formed by: opening a hole on the transparent hard resin layer; the number and the size of the open pores can be adjusted according to actual needs; and penetrating the micro-pipe through the transparent hard resin layer through the opening, and pumping the microalgae suspension liquid to a position between the transparent hard resin layer and the polyimide-based composite film layer through the micro-pipe to form a microalgae suspension liquid layer.
In this embodiment, the mature microalgae can be discharged through an opening (not shown) in the form of suspension, and then the microalgae can be obtained from the suspension after simple filtration for use; the activity monitoring of the microalgae can be carried out by taking out a small amount of microalgae samples through an outlet periodically and then carrying out activity detection, and the specific detection method and detection indexes are the prior art, which is not specifically described in the embodiment.
The transparent hard resin layer 5 is made of transparent hard epoxy resin and is laid on the microalgae suspension layer, and the transparent hard epoxy resin layer has good light transmittance on one hand, so that the microalgae can receive sufficient illumination, and plays a role in protection on the other hand, and the microalgae is prevented from being interfered by an external environment.
By the arrangement of the capture and utilization system of the embodiment, a closed 'arch' capture cover can be formed, so that CO discharged by the aeration tank2All gas is limited into a trapping system and then passes through microalgae to selectively pass through CO2The gas is absorbed and utilized, on one hand, the CO discharged by the aeration tank can be absorbed and utilized2The comprehensive utilization of the gas is realized; and the growth and maturation of the microalgae on the other hand can be used in the industries of food, chemical engineering and the like, so that double economic benefits are realized.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. Aeration tank CO of sewage treatment plant2The trapping and utilizing system comprises a biological aeration tank (1) and is characterized by also comprising a supporting material layer (2), a polyimide-based composite film layer (3), a microalgae suspension layer (4) and a transparent hard resin layer (5);
the supporting material layer (2) is arched and is positioned above the biological aeration tank, is used for supporting the system and forming a closed space, and prevents CO generated by the aeration tank2Directly enters the atmosphere;
the polyacyl composite film layer (3) is laid on the support material layer and used for CO2Selective passage of gas;
the microalgae suspension layer (4) is laid on the polyacyl composite membrane layer and used for CO2Absorbing and utilizing gas;
the transparent hard resin layer (5) is laid on the microalgae suspension layer and used for light transmission and system protection.
2. The aeration tank CO of the sewage treatment plant according to claim 12The capture and utilization system is characterized in that the layer of support material (2) comprises a porous plastic and an arched support structure.
3. The aeration tank CO of the sewage treatment plant according to claim 22A capture utilization system, wherein the porous plastic is layered on the arched support structure.
4. The aeration tank CO of the sewage treatment plant according to claim 32The capture and utilization system is characterized in that the porous plastic is PVC porous plastic.
5. The aeration tank CO of the sewage treatment plant according to claim 12A trapping and utilizing system for the waste water in the waste water tank,the preparation method is characterized in that the material of the polyacyl composite membrane layer (3) is a polyimide hollow fiber membrane.
6. The aeration tank CO of the sewage treatment plant according to claim 12The trapping and utilizing system is characterized in that the material of the transparent hard resin layer (5) is transparent hard epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111294449.XA CN114100361B (en) | 2021-11-03 | 2021-11-03 | Sewage treatment plant aeration tank CO 2 Trapping and utilizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111294449.XA CN114100361B (en) | 2021-11-03 | 2021-11-03 | Sewage treatment plant aeration tank CO 2 Trapping and utilizing system |
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| Publication Number | Publication Date |
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| CN114100361A true CN114100361A (en) | 2022-03-01 |
| CN114100361B CN114100361B (en) | 2022-09-23 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001170671A (en) * | 1999-12-15 | 2001-06-26 | Research Institute Of Innovative Technology For The Earth | Biological treatment method and apparatus for wastewater |
| CN102765822A (en) * | 2012-07-17 | 2012-11-07 | 上海应用技术学院 | Carbon dioxide collector for sewage treatment |
| CN104556547A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | Method for treating oil field sewage and fixing CO2 by utilizing microalgae |
| CN104787892A (en) * | 2015-03-27 | 2015-07-22 | 沈阳航空航天大学 | Closed ecological treatment system for microalgae wastewater in nano biological membrane |
| CN104826450A (en) * | 2006-10-02 | 2015-08-12 | 环球研究技术有限公司 | Method and device for extracting CO2 from air |
| CN111495170A (en) * | 2020-06-02 | 2020-08-07 | 上饶师范学院 | Pig farm odor recycling system |
| CN113150944A (en) * | 2021-03-25 | 2021-07-23 | 青海师范大学 | Biological reaction system and method for producing microalgae by using agricultural wastewater and waste gas |
-
2021
- 2021-11-03 CN CN202111294449.XA patent/CN114100361B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001170671A (en) * | 1999-12-15 | 2001-06-26 | Research Institute Of Innovative Technology For The Earth | Biological treatment method and apparatus for wastewater |
| CN104826450A (en) * | 2006-10-02 | 2015-08-12 | 环球研究技术有限公司 | Method and device for extracting CO2 from air |
| CN102765822A (en) * | 2012-07-17 | 2012-11-07 | 上海应用技术学院 | Carbon dioxide collector for sewage treatment |
| CN104556547A (en) * | 2013-10-29 | 2015-04-29 | 中国石油化工股份有限公司 | Method for treating oil field sewage and fixing CO2 by utilizing microalgae |
| CN104787892A (en) * | 2015-03-27 | 2015-07-22 | 沈阳航空航天大学 | Closed ecological treatment system for microalgae wastewater in nano biological membrane |
| CN111495170A (en) * | 2020-06-02 | 2020-08-07 | 上饶师范学院 | Pig farm odor recycling system |
| CN113150944A (en) * | 2021-03-25 | 2021-07-23 | 青海师范大学 | Biological reaction system and method for producing microalgae by using agricultural wastewater and waste gas |
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