CN114307513B - Device and method for capturing and fixing dissipated carbon dioxide in sewage treatment plant - Google Patents
Device and method for capturing and fixing dissipated carbon dioxide in sewage treatment plant Download PDFInfo
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Abstract
The invention discloses a device and a method for capturing and fixing dissipated carbon dioxide in a sewage treatment plant, wherein the device comprises a carbon dioxide vacuum capturing system, a carbon dioxide separation and purification system, a carbon dioxide fixing system, a carbon dioxide recycling system and an organic matter collecting device generated by carbon dioxide conversion.
Description
Technical Field
The invention relates to a device and a method for capturing and fixing dissipated carbon dioxide in a sewage treatment plant, belonging to the technical field of carbon emission reduction in sewage treatment.
Background
Carbon dioxide is responsible for the worldThe major warming gases for warming, on average, are about 0.387% by volume of the atmosphere 0 . According to statistics of developed countries, the carbon emission amount of the sewage treatment industry accounts for 1% -2% of the total emission amount of the whole society, and the carbon emission industry is the first ten carbon emission industries and is a non-negligible emission reduction field. According to the related prediction of the U.S. EPA agency, the greenhouse gas emission dissipation amount of the global sewage treatment industry is predicted to reach billions of tons of carbon dioxide emission equivalent by 2030. And researches show that the concentration of carbon dioxide dissipated from a sewage treatment plant is higher than that of carbon dioxide dissipated from other buildings, so that CO dissipated in the urban sewage treatment process is particularly high 2 The research of trapping and fixing is very necessary and has very important significance.
Therefore, the invention provides a device and a method for capturing and fixing escaped carbon dioxide in a sewage treatment plant, and aims to provide technical support for pollution reduction and carbon reduction in the field of sewage treatment. There is little current research on this aspect and prior patent applications for carbon dioxide capture and sequestration include:
(1) The invention discloses a square packed tower (application number: CN 201611091203.1) for capturing carbon dioxide in flue gas, which comprises: the device comprises an absorbent initial distributor positioned at the lower end of a flue gas outlet, a vertical plate type filler positioned at the lower end of the absorbent initial distributor and a radiation diversion type gas distributor positioned at the bottom of a square packed tower and used for introducing flue gas carbon dioxide; the radiation diversion type gas distributor comprises a gas inlet pipe, a butterfly-shaped bottom plate, a butterfly-shaped sealing plate and a plurality of radiation diversion plates; the butterfly-shaped bottom plate is communicated with an outlet of the gas inlet pipe; the radiation guide plate is radially arranged between the butterfly-shaped bottom plate and the butterfly-shaped sealing plate along the outlet of the gas inlet pipe.
The device and the method for capturing and fixing carbon dioxide in the flue gas mixture capture the carbon dioxide in the flue gas mixture, and the carbon dioxide is absorbed by the absorbent to avoid being released into the air.
(2) The invention discloses a method and a device for capturing carbon dioxide based on a hydrate method (application number: CN2015104974. X), and the invention discloses the method and the device for capturing the carbon dioxide based on the hydrate method, which comprises the following steps: carbon dioxide in the gas storage tank enters the tubular heat exchanger together with sewage in the water storage tank for precooling after being pressurized by the gas booster pump, enters the hydrate generation reactor to generate hydrate crystals, is separated from a solution mixture by the centrifugal machine, is decomposed in the hydrate decomposition reactor, and is separated into gas and pure water by the gas-liquid separator.
The application utilizes wastewater and carbon dioxide to generate carbon dioxide hydrate to realize the capture of the carbon dioxide, and the capture objects are carbon dioxide compared with the device and the method for capturing and fixing the carbon dioxide dissipated by the sewage treatment plant, but the capture objects are different in the aspects of carbon dioxide source, gas-liquid distribution mode, reaction condition, carbon dioxide capture and fixation principle and the like.
Disclosure of Invention
In order to better realize carbon dioxide emission reduction of a sewage treatment plant, the invention provides a device and a method for capturing and fixing escaped carbon dioxide of the sewage treatment plant, aiming at capturing the carbon dioxide escaped from a structure in the sewage treatment process, fixing the carbon dioxide and generating value-added chemicals.
The technical scheme of the invention is as follows:
a device for capturing and fixing dissipated carbon dioxide in a sewage treatment plant mainly comprises a carbon dioxide vacuum capturing system, a carbon dioxide separation and purification system, a carbon dioxide fixing system, a carbon dioxide recycling system and a product collecting system; capturing mixed gas escaping from a biochemical treatment unit through the carbon dioxide vacuum capturing system, enabling the mixed gas to enter a condenser through a connecting pipe of the carbon dioxide vacuum capturing system and the carbon dioxide separation and purification system, separating liquid carbon dioxide and residual mixed gas formed by condensation through the gas-liquid separator, enabling the separated liquid carbon dioxide to enter an evaporator to recover the gas state, enabling the separated liquid carbon dioxide to enter the carbon dioxide separation and purification system through a hose, enabling the residual gas generated in the reaction process to enter the carbon dioxide fixing system through the carbon dioxide recycling system for recycling, and storing and discharging organic matters and residual biochemical sewage generated in the reaction through a product collecting system arranged below the carbon dioxide fixing system
The device includes: a mixed gas vacuum trapping cover; an induced draft fan; a connecting pipe for the carbon dioxide capture system and the carbon dioxide separation and purification system; a condenser; a gas-liquid separator; an impurity gas exhaust port; an evaporator; a hose connecting the carbon dioxide separation and purification system and the carbon dioxide fixation system; a carbon dioxide disk gas distribution device; the air outlet of the disc type air distribution device; a biochemical sewage water distribution pipe; a biochemical sewage outlet; a filler; a residual reaction gas outlet with a filter screen; a residual reaction gas recycling pipe; a mixed liquid collecting tank for organic matter and biochemical sewage; organic matter and biochemical sewage separator; an organic matter collecting device; and a residual biochemical sewage discharge device.
Further, in the above scheme, the carbon dioxide vacuum capturing system comprises a capturing cover and an induced draft fan, the induced draft fan is installed in the capturing cover, the capturing cover adopts a structure with a large inlet and a small outlet, which is beneficial to gas collection, and meanwhile, the induced draft fan is utilized to create a vacuum condition to capture mixed gas.
Further, in the above scheme, the carbon dioxide separation and purification system comprises a condenser, a gas-liquid separator, an impurity gas exhaust port and an evaporator, the condenser, the gas-liquid separator and the evaporator are sequentially connected through a pipeline, the impurity gas exhaust port is arranged above the gas-liquid separator, the condenser can condense carbon dioxide in the mixed gas into liquid firstly by utilizing the difference of different gas boiling points, then the liquid enters the gas-liquid separator, the residual mixed gas is discharged from the exhaust port at the top of the separator, liquid carbon dioxide enters the evaporator, the high-temperature liquid carbon dioxide is recovered into a gaseous state, and finally the separation of the carbon dioxide and other mixed gas is realized.
Further, in the above solution, the carbon dioxide vacuum capturing system and the carbon dioxide separation and purification system are connected by using a connecting pipe, the connecting pipe is connected with the capturing cover of the carbon dioxide vacuum capturing system at the beginning and connected with the condenser of the carbon dioxide separation and purification system at the end.
Further, in the above scheme, the carbon dioxide fixing system includes a carbon dioxide disc type gas distribution device, a carbon dioxide gas outlet, a biochemical sewage distribution pipe, a biochemical sewage water outlet and a filler, all the components are installed in a barrel to form a barrel type reactor, the carbon dioxide disc type gas distribution device is located at the top of the reactor, the carbon dioxide gas outlet is uniformly distributed on the surface of the carbon dioxide disc type gas distribution device, the biochemical sewage water distribution pipe is located 100cm below the carbon dioxide disc type gas distribution device, the biochemical sewage water outlet is uniformly distributed on the surface of the biochemical sewage water distribution pipe, the filler is located 100cm below the biochemical sewage water distribution pipe, the captured mixed gas and biochemical sewage are used as raw materials and enter the reactor through the disc type gas distribution device and the biochemical sewage water distribution pipe respectively, and the disc type gas distribution device can promote the carbon dioxide to be uniformly dispersed in the reactor.
Further, in the above solution, the carbon dioxide separation and purification system and the carbon dioxide fixing system are connected by using a hose, the end of the hose is connected to the evaporator of the carbon dioxide separation and purification system, and the end of the hose is connected to the carbon dioxide disk type gas distribution device of the carbon dioxide fixing system.
Further, in the above scheme, biochemical sewage of different biological treatment units, namely activated sludge sewage, SBR sewage or A sewage can be selected 2 And in the O system sewage, under the action of biochemical sewage, a biological film is formed on the surface of the carbon dioxide fixing system filler, and carbon dioxide is fixed by utilizing carbon-fixing microorganisms in the biological film.
Further, in the above scheme, the carbon dioxide recycling system comprises a residual reaction gas outlet with a filter screen and a residual reaction gas recycling pipe, the residual reaction gas outlet with the filter screen is located at the position of the cylinder wall 20cm above the bottom of the cylindrical reactor and is externally connected with the residual reaction gas recycling pipe, the residual reaction gas in the carbon dioxide fixing system contains a part of unused carbon dioxide, the mixed gas passes through the residual reaction gas outlet with the filter screen and enters a connecting pipe of the carbon dioxide capturing system and the carbon dioxide separation and purification system through the gas recycling pipe, recycling of the carbon dioxide is realized, and the filter screen of the gas outlet is used for preventing impurity particles from entering the recycling pipe.
Further, in the above scheme, the product collecting system comprises an organic matter and biochemical sewage mixed liquid collecting tank, an organic matter and biochemical sewage separator, an organic matter collecting device and a residual biochemical sewage discharging device, the organic matter and biochemical sewage mixed liquid collecting tank is connected to the bottom end of the barrel reactor, the organic matter and biochemical sewage separator is connected to the bottom end of the organic matter and biochemical sewage mixed liquid collecting tank, the organic matter collecting device and the residual biochemical sewage discharging device are connected with the organic matter and biochemical sewage separator through different pipelines, carbon dioxide generates value-added chemicals under the action of carbon-fixing microorganisms, the organic chemicals and sewage separate the organic matters from the residual biochemical sewage through a centrifugal separator arranged at the lower part of the organic matter and biochemical sewage mixed liquid collecting tank, finally the organic matters are stored in the organic matter collecting device, and the residual biochemical sewage is discharged through the residual biochemical sewage discharging device.
Advantageous effects
Compared with the prior art, the beneficial effects of the invention are embodied in the following points:
1) According to the device and the method for capturing and fixing dissipated carbon dioxide of the sewage treatment plant, the proper vacuum degree is arranged in the capturing cover, carbon dioxide with larger dissipation amount in the sewage treatment plant can be collected through the carbon dioxide vacuum capturing system, and the influence of carbon dioxide gas directly discharged by the sewage treatment plant on the greenhouse effect is reduced;
2) According to the device and the method for capturing and fixing dissipated carbon dioxide in the sewage treatment plant, the carbon dioxide after separation and purification can be reduced and fixed under the action of the carbon-fixing biological film on the surface of the filler in the middle of the carbon dioxide fixing system to generate organic matters, so that the resource utilization of carbon dioxide gas is promoted;
3) The invention provides a device and a method for capturing and fixing dissipated carbon dioxide of a sewage treatment plant, provides a reliable device and a method for reducing the emission of carbon dioxide gas of the sewage treatment plant, and realizes technical innovation and breakthrough;
4) According to the device and the method for capturing and fixing the dissipated carbon dioxide in the sewage treatment plant, provided by the invention, the biochemical sewage in the fixing system can be replaced as required, and the research method is also suitable for the research in the fields of industrial sewage, livestock and poultry breeding wastewater and the like, and has a strong application value;
5) The invention provides a device and a method for capturing and fixing escaped carbon dioxide in a sewage treatment plant, which are used for capturing and fixing CO 2 In the trapping and fixing process, no additional chemical reagent is needed, the gas and liquid participating in the reaction are the original resources of the sewage treatment plant, the carbon is fixed by a biological method, and the method is a sustainable technology, is simple to operate and is convenient to control.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a flow chart of the systems of the present invention;
FIG. 3 is a block diagram of a carbon dioxide vacuum capture system of the present invention;
FIG. 4 is a schematic diagram of a carbon dioxide separation and purification system according to the present invention;
FIG. 5 is a block diagram of a carbon dioxide fixing system of the present invention;
FIG. 6 is a block diagram of a carbon dioxide recovery system according to the present invention;
FIG. 7 is a block diagram of a product collection system according to the present invention;
the system comprises a 1-mixed gas vacuum capturing cover, a 2-induced draft fan, a 3-connecting pipe for a carbon dioxide capturing system and a carbon dioxide separating and purifying system, a 4-condenser, a 5-gas-liquid separator, a 6-impurity gas exhaust port, a 7-evaporator, an 8-hose for connecting the carbon dioxide separating and purifying system and a carbon dioxide fixing system, a 9-carbon dioxide disc type gas distribution device, an air outlet of a 10-disc type gas distribution device, an 11-biochemical sewage water distribution pipe, a 12-biochemical sewage water outlet, a 13-filler, a 14-residual reaction gas air outlet with a filter screen, a 15-residual reaction gas recycling pipe, a 16-organic matter and biochemical sewage mixed liquid collecting pool, a 17-organic matter and biochemical sewage separator, an 18-organic matter collecting device and a 19-residual biochemical sewage discharging device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Example 1
As shown in fig. 3, the present embodiment is a carbon dioxide vacuum capturing system of a device for capturing and fixing carbon dioxide escaped from a sewage treatment plant, the system comprising:
the device comprises a collecting cover 1 for absorbing mixed gas containing carbon dioxide, wherein the collecting cover 1 is positioned right above a biochemical pool, so that gas escaping from a structure can directly enter the collecting cover 1, the vacuum collecting cover 1 is made of polytetrafluoroethylene, and the main body structure is in an inverted horn shape with a large inlet and a small outlet;
and the draught fan 2 is used for manufacturing a vacuum condition, the draught fan 2 is arranged in the trapping cover, and the vacuum degree is controlled by utilizing the draught fan 2.
The method for capturing the mixed gas comprises the following steps:
s1, installing an induced draft fan 2 in the trapping cover 1;
s2, placing the trapping cover 1 right above a structure;
s2, controlling the vacuum degree by using an induced draft fan 2, wherein the vacuum degree is-101325 Pa;
s4, under the action of the draught fan 2, the mixed gas is trapped in the hood;
and S5, the mixed gas enters the connecting pipe 3 behind the collecting cover 1.
Example 2
As shown in fig. 4, the embodiment is a device for capturing and fixing carbon dioxide emitted from a sewage treatment plant, comprising:
a condenser 4 for obtaining liquid carbon dioxide, wherein the air intake of the condenser 4 is mixed gas collected by a carbon dioxide vacuum collecting system, single liquid carbon dioxide is obtained by utilizing the different boiling points of different gas components in the mixed gas,
a gas-liquid separator 5 for separating liquid carbon dioxide and residual mixed gas, the gas-liquid mixture comes from the condenser 4, the top of the gas-liquid separator is provided with an impurity gas exhaust port 6 for exhausting the residual mixed gas,
an evaporator 7 for converting the separated liquid carbon dioxide into purified gaseous carbon dioxide, wherein the liquid carbon dioxide comes from the liquid separated by the gas-liquid separator 5, carbon dioxide gas is obtained at high temperature,
the method for separating and purifying the carbon dioxide comprises the following steps:
s1, connecting a condenser 4 to an outlet of a trapping cover by using a connecting pipe 3;
s2, setting a proper temperature;
s3, continuously introducing the mixed gas into a condenser through a connecting pipe 3;
s4, after reacting for a period of time, at a low temperature, carbon dioxide in the mixed gas is preferentially changed into a liquid state and flows out of the condenser 4 through a pipeline;
s5, liquid carbon dioxide and mixed gas enter a gas-liquid separator 5, and the residual mixed gas is discharged through an impurity gas exhaust port 6 arranged at the top of the gas-liquid separator to obtain liquid carbon dioxide;
s6, the liquid carbon dioxide enters an evaporator 7, and gaseous carbon dioxide is obtained at a high temperature;
and S7, the separated and purified gaseous carbon dioxide enters a hose connected with the evaporator.
Example 3
As shown in fig. 5, this embodiment is a device for capturing and fixing escaped carbon dioxide in a sewage treatment plant, each component is installed in a cylinder to form a cylinder reactor, the diameter of the inner cylinder is 2m, the height of the inner cylinder is 6m, and the system comprises:
a carbon dioxide disc type gas distribution device 9 for distributing gaseous carbon dioxide and a gas outlet 10 of the disc type gas distribution device adopt disc type to be beneficial to the uniform distribution of carbon dioxide gas, the carbon dioxide disc type gas distribution device 9 is positioned at the top of a reactor, the gas outlet 10 is uniformly distributed on the surface of the carbon dioxide disc type gas distribution device, the diameter of the device is 1.8m,
a biochemical sewage water distributing pipe 11 and a biochemical sewage water outlet 12, the biochemical sewage water distributing pipe 11 is positioned at the position 100cm below the carbon dioxide disc type gas distributing device, the biochemical sewage water outlet 12 is evenly distributed on the surface of the biochemical sewage water distributing pipe 11,
the filler 13 used for the biomembrane carrier utilizes biochemical sewage to promote the formation of biomembranes on the surface of the filler, utilizes carbon-fixing microorganisms as a biocatalyst to realize the fixation of carbon dioxide, the filler 13 is positioned at the position of 100cm below a biochemical sewage water distribution pipe, the height of the filler is 1m,
the method for carbon dioxide fixation comprises the following steps:
s1, carbon dioxide gas enters a disc type gas distribution device 9 through a hose 8 and is uniformly discharged through a gas outlet 10, and the flow rate of the carbon dioxide gas is 20m 3 /h；
S2, selecting activated sludge sewage, SBR sewage or A 2 The sewage of the O system is used as the source of biochemical sewage, the biochemical sewage enters a biochemical sewage distribution pipe 11, and the flow of the sewage in the pipe is 10m 3 /h；
And S3, under the action of biochemical sewage, a biological film is formed on the surface of the filler 13, wherein one part of the biological film is carbon fixing microorganisms, and the microorganisms use carbon dioxide as a raw material to meet self metabolism and reduce the carbon dioxide into organic matters.
Example 4
As shown in fig. 6, the embodiment is a device for capturing and fixing carbon dioxide emitted from a sewage treatment plant, comprising:
a residual reaction gas outlet 14 with a filter screen for filtering and allowing gas to escape, the gas after reaction contains unreacted carbon dioxide, the gas outlet 14 is positioned on the cylinder wall of 20cm above the bottom of the cylindrical reactor, which is beneficial to discharging the residual gas after reaction,
a residual reaction gas recycling pipe 15 used for conveying residual reaction gas, the starting end of the recycling pipe 15 is connected with a residual reaction gas outlet 14 with a filter screen, the tail end of the recycling pipe is connected with a connecting pipe 3 between the condenser 4 and the collecting cover 1, and then the residual reaction gas can enter a carbon dioxide separation and purification system for recycling,
the method for recycling the carbon dioxide comprises the following steps:
s1, filtering the gas after the reaction by a filter screen of an air outlet 14, wherein impurities may be contained in the gas;
s2, the residual reaction gas enters a residual reaction gas recycling pipe 15;
s3, the residual reaction gas enters a connecting pipe between the condenser 4 and the collecting cover 1 through a recycling pipe 15;
and S4, the residual reaction gas enters a carbon dioxide separation and purification system, and the steps of the example 2 are repeated.
Example 5
As shown in fig. 7, the present embodiment is an apparatus for capturing and fixing escaped carbon dioxide from a sewage treatment plant, comprising:
a collection tank 16 for the mixed liquid of organic matter and biochemical sewage, which is used for temporarily collecting the organic matter generated by the reaction and the residual biochemical sewage, wherein the collection tank 16 is connected with the bottom end of the barrel-type reactor,
the separator 17 for separating organic matter and biochemical sewage uses the density difference of organic matter and biochemical sewage, adopts a centrifuge to separate,
an organic matter collecting device 18 for treating the products after the reaction and a residual biochemical sewage discharging device 19.
The product collection method comprises the following steps:
s1, allowing a mixed solution of organic matters generated by reaction and the remaining biochemical sewage to enter a collection tank 16 and temporarily collecting the mixed solution in the tank;
s2, allowing the mixed liquor to flow into a separator 17 from the collection tank 16, and adopting a centrifugal machine at a rotating speed of 3000r/min;
s3, the separated organic matters are stored in an organic matter collecting device 18, and the sewage of the residual biochemical system is discharged to a primary treatment unit through a residual biochemical sewage discharging device 19.
Claims (6)
1. A device for capturing and fixing dissipated carbon dioxide in a sewage treatment plant mainly comprises a carbon dioxide vacuum capturing system, a carbon dioxide separating and purifying system, a carbon dioxide fixing system, a carbon dioxide recycling system and a product collecting system;
the method is characterized in that: capturing mixed gas escaping from a biochemical treatment unit through the carbon dioxide vacuum capturing system, enabling the mixed gas to enter a condenser through a connecting pipe of the carbon dioxide vacuum capturing system and the carbon dioxide separation and purification system, separating liquid carbon dioxide and residual mixed gas formed by condensation through a gas-liquid separator, enabling the separated liquid carbon dioxide to enter an evaporator to recover the gas state, enabling the separated liquid carbon dioxide to enter the carbon dioxide fixing system through a hose, enabling residual gas generated in the reaction process to be recycled through the carbon dioxide recycling system, and storing and discharging organic matters and residual biochemical sewage generated in the reaction through a product collecting system arranged below the carbon dioxide fixing system;
the carbon dioxide separation and purification system comprises a condenser (4), a gas-liquid separator (5), an impurity gas exhaust port (6) and an evaporator (7), the condenser (4), the gas-liquid separator (5) and the evaporator (7) are sequentially connected through a pipeline, and the impurity gas exhaust port (6) is arranged above the gas-liquid separator (5);
the carbon dioxide fixing system comprises a carbon dioxide disc type gas distribution device (9), a carbon dioxide gas outlet (10), a biochemical sewage water distribution pipe (11), a biochemical sewage water outlet (12) and a filler (13), all the parts are arranged in a cylinder to form a cylinder type reactor, the carbon dioxide disc type gas distribution device (9) is positioned at the top of the reactor, the carbon dioxide gas outlet (10) is uniformly distributed on the surface of the carbon dioxide disc type gas distribution device (9), the biochemical sewage water distribution pipe (11) is positioned at a position 100cm below the carbon dioxide disc type gas distribution device (9), the biochemical sewage water outlet (12) is uniformly distributed on the surface of the biochemical sewage water distribution pipe (11), and the filler (13) is positioned at a position 100cm below the biochemical sewage water distribution pipe (11);
the carbon dioxide recycling system comprises a residual reaction gas outlet (14) with a filter screen and a residual reaction gas recycling pipe (15), wherein the residual reaction gas outlet (14) with the filter screen is positioned at the cylinder wall of 20cm above the bottom of the cylindrical reactor and is externally connected with the residual reaction gas recycling pipe (15);
the product collecting system comprises an organic matter and biochemical sewage mixed liquid collecting tank (16), an organic matter and biochemical sewage separator (17), an organic matter collecting device (18) and a residual biochemical sewage discharge device (19), wherein the organic matter and biochemical sewage mixed liquid collecting tank (16) is connected to the bottom end of the barrel type reactor, the organic matter and biochemical sewage separator (17) is connected to the bottom end of the organic matter and biochemical sewage mixed liquid collecting tank (16), and the organic matter collecting device (18) and the residual biochemical sewage discharge device (19) are connected with the organic matter and biochemical sewage separator (17) by different pipelines.
2. The device for capturing and fixing carbon dioxide dissipated by sewage treatment plant according to claim 1, characterized in that: the carbon dioxide vacuum capturing system comprises a capturing cover (1) and an induced draft fan (2), wherein the induced draft fan (2) is arranged in the middle of the capturing cover (1).
3. The device for capturing and fixing carbon dioxide dissipated by sewage treatment plant according to claim 1, characterized in that: the carbon dioxide vacuum capturing system and the carbon dioxide separation and purification system are connected by using a connecting pipe (3), the beginning end of the connecting pipe (3) is connected with a capturing cover (1), and the end of the connecting pipe is connected with a condenser (4).
4. The apparatus of claim 1, wherein the capturing and fixing device for carbon dioxide dissipated from sewage treatment plant comprises: and connecting the carbon dioxide separation and purification system and the carbon dioxide fixing system by using a hose (8), wherein the beginning end of the hose is connected with the evaporator (7), and the tail end of the hose is connected with a carbon dioxide disc type gas distribution device (9).
5. The device for capturing and fixing carbon dioxide dissipated by sewage treatment plant according to claim 1, characterized in that: the biochemical sewage of the carbon dioxide fixing system is activated sludge sewage, SBR sewage or A2O system sewage.
6. A method for carbon dioxide capture sequestration fixation using the device of any one of claims 1-5, comprising the steps of:
s1: a carbon dioxide vacuum capturing cover (1) is arranged above the biochemical treatment structure, and mixed gas generated by a biological treatment unit of a sewage treatment plant is captured under the action of a draught fan (2);
s2: the trapped mixed gas enters a condenser (4) through a connecting pipe (3) of a carbon dioxide trapping system and a carbon dioxide separation and purification system, carbon dioxide in the mixed gas is condensed into liquid, a gas-liquid mixture enters a gas-liquid separator (5) to separate liquid carbon dioxide, the rest gas is discharged through an impurity gas exhaust port (6) arranged at the top of the gas-liquid separator (5), and the liquid carbon dioxide enters an evaporator (7) to be recovered to a gas state;
s3: carbon dioxide gas enters a carbon dioxide fixing system through a hose (8), the carbon dioxide is filled in the whole reactor through a gas outlet (10) of a disc type gas distribution device (9), a biochemical sewage water distribution pipe (11) is arranged below the disc type gas distribution device, sewage of the biochemical system is uniformly distributed in the reactor through a biochemical sewage water outlet (12) on the water distribution pipe (11), and a biological film is formed on a filler (13);
s4: gas generated in the reactor enters a residual reaction gas recycling pipe (15) through a residual reaction gas outlet (14) and finally enters a connecting pipe (3) for recycling carbon dioxide;
s5: organic chemicals and sewage are collected in a mixed liquid collecting tank (16) of organic matters and biochemical sewage, organic matters and residual biochemical system sewage are separated through an organic matter and biochemical sewage separator (17) arranged at the lower part of the collecting tank, the organic matters enter an organic matter collecting device (18), and the residual biochemical system sewage enters a residual biochemical sewage discharging device (19).
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| CN208549828U (en) * | 2017-11-10 | 2019-03-01 | 天津商业大学 | A kind of dry ice fruits and vegetables freeze-drying refrigeration system |
| CN208269505U (en) * | 2018-05-29 | 2018-12-21 | 国电环境保护研究院 | A kind of co 2 liquefaction device of flue gas carbon capture system |
| CN112354351A (en) * | 2020-11-17 | 2021-02-12 | 中国瑞林工程技术股份有限公司 | System and method for recycling gas containing carbon dioxide |
| CN113175687A (en) * | 2021-05-28 | 2021-07-27 | 哈尔滨工业大学 | Flue gas carbon dioxide capturing and purifying system and method |
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