CN116272341A - Sewage treatment system with zero carbon emission - Google Patents
Sewage treatment system with zero carbon emission Download PDFInfo
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- CN116272341A CN116272341A CN202310088330.XA CN202310088330A CN116272341A CN 116272341 A CN116272341 A CN 116272341A CN 202310088330 A CN202310088330 A CN 202310088330A CN 116272341 A CN116272341 A CN 116272341A
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- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 71
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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
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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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Abstract
The invention relates to a zero-carbon-emission sewage treatment system, wherein a carbon release module comprises a sewage treatment layer and a muddy water separation layer, the carbon diversion module comprises a separation gas collection layer and a quantitative distribution layer, an alkali liquor chamber and an acid liquor chamber are arranged in the separation gas collection layer, a first diversion pipe is arranged on one side of the muddy water separation layer and communicated with the alkali liquor chamber, the alkali liquor chamber is connected with the acid liquor chamber through a connecting diversion pipe, the acid liquor chamber is communicated with the quantitative distribution layer through a second diversion pipe, a non-carbon dioxide gas collection pipe is arranged on the alkali liquor chamber and communicated with the quantitative distribution layer, an alkali liquor flow valve is arranged on the connecting diversion pipe, flowmeter are arranged on the second diversion pipe and the non-carbon dioxide gas collection pipe, the carbon recovery module comprises a plurality of photosynthetic metabolism layers, the quantitative distribution layer is communicated with the photosynthetic metabolism layer at the bottommost layer through a third diversion pipe, microalgae are cultivated in each photosynthetic metabolism layer, an illuminating lamp is arranged on the inner wall of the carbon recovery module, and the photosynthetic metabolism layer at the uppermost side is communicated with the alkali liquor chamber through a reflux pipe. The invention realizes the aim of carbon emission reduction at the same time of sewage treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system with zero carbon emission.
Background
The sewage treatment capacity of China reaches 400 hundred million tons each year, and in the prior art, an activated sludge process is a traditional mainstream process for sewage treatment, and the effluent after treatment can reach the first-level A standard. However, in activated sludgeThe microorganisms can continuously release corresponding amount of CO into the atmosphere during mineralization of pollutants in sewage 2 Thereby causing greenhouse gas emissions. At present, the traditional sewage treatment plant in China adopts the treatment process of an activated sludge process, and each ton of sewage COD (chemical oxygen demand) is discharged up to the standard to generate 300-800 g of CO 2 eq (carbon dioxide emission equivalent), CO 2 The contribution of emissions is large. For this purpose, CO in combination with a sewage treatment process is developed and optimized 2 The emission reduction process is one of the effective means for realizing the low-carbon treatment of sewage.
In the well known global ecosystem, microalgae are an important carbon sink system for absorbing CO 2 Isothermal chamber gases play an important role in slowing down global climate warming. Microalgae are miniature autotrophic plants which are widely distributed on land and in the ocean, are rich in nutrition and have high photosynthetic availability. Microalgae fix CO by photosynthesis 2 Is more efficient than terrestrial plants, which benefit from CO in water 2 Is about the content of CO in the air 2 3000 times of the content, on the other hand, due to the refraction, diffraction, scattering and other effects of water on light, all surfaces of the microalgae can receive light irradiation. Studies have shown that algae cells have more than 50% carbon content, and can consume about 1.5 tons of CO per 1 ton of microalgae produced 2 . The microalgae can not only absorb CO gas 2 Can also absorb CO dissolved in water 2 、HCO 3 - 、CO 3 2- Inorganic carbon sources, N, P nutrient elements in the culture solution are consumed, organic pollutants are degraded, and absorption and conversion of waste gas and sewage before carbon emission can be realized in a targeted manner. In addition, the biomass of the microalgae can be used for producing biofuel, feed, extracting useful substances and other resources, and has wide application prospect.
Currently, related researches and applications of microalgae in the field of sewage treatment mainly relate to screening and cultivating microalgae species with high photosynthesis efficiency and high added value, efficiently extracting resource substances in the algae and the like. However, in the present stage, in mature sewage treatment plants, the technology processes such as an activated sludge method and a biomembrane method form mature supporting facilities and stably operate, if microalgae organism groups are directly introduced into the system, the transformation cost of the system and the risk of unstable operation are increased, in addition, the tolerance effect of microalgae to high ammonia nitrogen sewage is poor, and the microalgae are difficult to synchronously operate with the sewage treatment system.
Disclosure of Invention
The invention aims to provide a sewage treatment system with zero carbon emission, which utilizes activated sludge to treat organic substances in sewage to form carbon dioxide and utilizes microalgae to absorb and treat the carbon dioxide, so that the aim of carbon emission reduction is also realized while sewage is treated.
The aim of the invention is realized by the following technical scheme:
the sewage treatment system with zero carbon emission comprises a carbon release module, a carbon diversion module and a carbon recovery module which are sequentially arranged from bottom to top, wherein the interior of the carbon release module is divided into a sewage treatment layer at the lower side and a mud-water separation layer at the upper side through a sludge filler blocking net, an aeration head and an activated sludge input pipe are arranged at the bottom of the sewage treatment layer, and a filtering membrane group is arranged in the mud-water separation layer; the carbon diversion module comprises a separation gas collecting layer at the lower side and a quantitative distribution layer at the upper side, an alkali liquor chamber and an acid liquor chamber are arranged in the separation gas collecting layer, a first diversion pipe is arranged at one side of the muddy water separation layer, stretches into the separation gas collecting layer and is connected with an input pipe of the alkali liquor chamber, an output end of the alkali liquor chamber is connected with the input end of the acid liquor chamber through a connection diversion pipe, a second diversion pipe is arranged at one side of the separation gas collecting layer and is communicated with the quantitative distribution layer, the second diversion pipe is connected with an output pipe of the acid liquor chamber, a non-carbon dioxide gas collecting pipe is arranged on the alkali liquor chamber and is communicated with the quantitative distribution layer, an alkali liquor flow valve is arranged on the connection diversion pipe, a carbon dioxide flowmeter is arranged on the second diversion pipe, and a non-carbon dioxide flowmeter is arranged on the non-carbon dioxide gas collecting pipe; the carbon recovery module comprises a plurality of photosynthetic metabolism layers, a third diversion pipe is arranged on one side of the quantitative distribution layer and is communicated with the photosynthetic metabolism layer at the bottommost layer, adjacent photosynthetic metabolism layers are separated by a partition plate, one end of the partition plate is provided with a gas guide plate which is fully provided with ventilation holes, microalgae are cultivated in each photosynthetic metabolism layer, an illuminating lamp is arranged on the inner wall of the carbon recovery module, the illuminating lamp penetrates through each photosynthetic metabolism layer, and the photosynthetic metabolism layer at the uppermost side is communicated with the alkali liquor chamber through a backflow pipe.
The sewage treatment layer is provided with a sewage input pipe and a sludge discharge pipe, the bottom of the separation gas collecting layer is provided with a filtering main pipe, the upper ends of each group of filtering membrane groups in the mud-water separation layer are respectively provided with a connecting pipe connected with the filtering main pipe, and the output end of the filtering main pipe is connected with a purified water output pipe.
The bottom of the sewage treatment layer is provided with an aeration pipe with an aeration pump, and each aeration head at the bottom of the sewage treatment layer is supplied with air through the aeration pipe.
One side of the alkali liquor chamber is provided with a one-way exhaust pipe, and the other side is provided with an alkali liquor injection port.
One side of the acid liquor chamber is provided with an acid liquor injection port, and the other side is provided with a salt discharge port.
One side of the quantitative distribution layer is provided with a pressure gauge, and the other side of the quantitative distribution layer is provided with a safe pressure reducing port.
The carbon recovery module comprises a plurality of photosynthetic metabolism layers, wherein the lowest photosynthetic metabolism layer is separated from the quantitative distribution layer through a bottom plate, adjacent photosynthetic metabolism layers are separated through a partition plate, and microalgae are arranged on the bottom plate and the partition plate.
The carbon recovery module upper end is equipped with the apron that can overturn and open, the inside temperature sensor and the PH sensor that are equipped with of carbon recovery module, in addition be equipped with the illumination controller of control each light illumination intensity on the carbon recovery module.
In the sewage treatment layer, organic substances in the sewage are degraded by activated sludge under aeration conditions to form carbon dioxide gas, and the carbon dioxide gas generated in the sewage treatment layer and the rest of aeration rise and pass through the first guide pipe and the input pipe to enter a lye chamber of a separation gas collection layer, wherein the carbon dioxide enters the lye chamber and then enters the lye chamber to react with OH - The reaction produces CO 3 2- The rest of the non-carbon dioxide gas enters through the non-carbon dioxide gas collecting pipeInto the dosing layer, CO 2 The gas is absorbed by alkali liquor to generate CO 3 2- Then continuously enter the acid liquor chamber, and acid-base neutralization reaction, namely CO, is carried out in the acid liquor chamber 3 2- +H + →CO 2 +H 2 O, then regenerated CO 2 The gas enters the quantitative distribution layer through the second flow guiding pipe.
The microalgae growth process comprises a photoperiod of an inoculation replacement phase, a dark period of the inoculation replacement phase, a photoperiod of a stable culture phase and a dark period of the stable culture phase.
The invention has the advantages and positive effects that:
1. the invention comprises a carbon release module, a carbon diversion module and a carbon recovery module, wherein the carbon release module utilizes activated sludge to degrade organic substances to produce carbon dioxide, simultaneously realizes mud-water separation and achieves the aim of directly discharging effluent, and the carbon recovery module utilizes photosynthesis of microalgae to absorb and consume CO in gas 2 The aim of zero carbon emission is further achieved, the carbon recovery module is separated from the carbon release module, microalgae culture is not influenced by polluted water property, a new activated sludge system containing microalgae does not need to be reconstructed in a sewage treatment layer, and gas CO required by different periods of different phases of the microalgae is considered 2 The invention firstly utilizes the separation gas collecting layer in the carbon flow guiding module to realize CO with different contents 2 Gas and non-CO 2 Separation of gases, and control of CO 2 Gas and non-CO 2 The gas is quantitatively input into the quantitative distribution layer of the carbon diversion module for mixing, so that the gas required by the different periods of the microalgae is formed.
2. The separation gas collecting layer in the carbon flow guiding module realizes CO by utilizing the coordination of the alkali liquor chamber and the acid liquor chamber 2 Gas and non-CO 2 The separation of gas, wherein the alkali liquor chamber is provided with a non-carbon dioxide gas collecting pipe with a non-carbon dioxide flowmeter and communicated with the quantitative distribution layer, the acid liquor chamber is communicated with the quantitative distribution layer through a second flow guide pipe with a carbon dioxide flowmeter, the alkali liquor chamber and the acid liquor chamber are communicated through a connecting flow guide pipe with an alkali liquor flow valve, and CO 2 Enters into the alkali liquor chamber to be combined with OH - The reaction produces CO 3 2- While the rest of the non-carbon dioxide gas (containing N 2 、O 2 Etc.) then enter the quantitative distribution layer through a non-carbon dioxide gas collecting pipe, and acid-base neutralization reaction, namely CO, occurs in the acid liquor chamber 3 2- +H + →CO 2 +H 2 O, regenerated CO 2 The gas enters the quantitative distribution layer through the second flow guide pipe, and the invention can realize the gas CO in the quantitative distribution layer through the carbon dioxide flowmeter, the non-carbon dioxide flowmeter and the alkali liquid flow valve 2 Concentration control, simple structure and control convenience also do benefit to simultaneously and guarantee control accuracy.
3. The photosynthetic metabolic layer at the uppermost side of the carbon recovery module is communicated with the alkali liquor chamber in the separation gas collecting layer through a return pipe, so that residual carbon dioxide gas reenters the alkali liquor chamber to realize cyclic treatment.
4. The carbon release module realizes mud-water separation and discharge of sewage, and the treated effluent can be directly discharged, thereby meeting the environmental protection requirement, and simultaneously avoiding biological invasion of a receiving water body caused by a large number of sewage microorganisms carried in the effluent.
5. The microalgae obtained after anabolism by the carbon recovery module shields harmful substances in sewage, and the recovered algae can be applied to the approaches of pharmacy, fuel, nutrition preparation and the like, has higher product utilization added value, is used as an industrial chain of the whole period of sewage treatment, further reduces the sewage treatment cost, and realizes the carbon emission reduction target while finishing sewage treatment.
Drawings
Figure 1 is a schematic perspective view of the present invention,
figure 2 is an enlarged schematic view of the carbon diversion module of figure 1,
figure 3 is a front view of the structure of the invention of figure 1,
FIG. 4 is a graph showing the change of total organic carbon content in a sewage treatment layer according to an embodiment of the present invention,
FIG. 5 is a diagram showing the change of the accumulated biomass of microalgae in the carbon recovery module according to an embodiment of the invention,
FIG. 6 is a graph showing the variation of carbon dioxide release and recovery content according to an embodiment of the present invention.
Wherein 1 is a sewage treatment layer, 101 is a sewage input pipe, 1011 is a sewage pump, 1012 is a sewage input port, 102 is a purified water output pipe, 1021 is a purified water output pump, 103 is an aeration pipe, 1031 is an aeration pump, 1032 is an aeration head, 104 is an activated sludge input pipe, 1041 is a sludge inoculation pump, 1042 is an activated sludge input port, 105 is a sludge discharge pipe, 1051 is a sludge discharge pump, 2 is a sludge-water separation layer, 201 is a sludge filler barrier net, 202 is a filtration membrane group, 203 is a first flow guide pipe, 3 is a separation gas collection layer, 301 is an alkali liquor chamber, 3011 is an input pipe, 3012 is a non-carbon dioxide gas collection pipe, 3013 is a one-way exhaust pipe, 3014 is an alkali liquor injection port, 3015 is a non-carbon dioxide flowmeter, 302 is a connecting guide pipe, 3021 is an alkali liquor flow valve, 303 is an acid liquor chamber, 3031 is an output pipe, 3032 is an acid liquor injection port, 3033 is a salt discharge port, 304 is a second guide pipe, 305 is a carbon dioxide flowmeter, 4 is a quantitative distribution layer, 401 is a third guide pipe, 402 is a return pipe, 403 is a pressure gauge, 404 is a safe decompression port, 5 is a photosynthetic metabolism layer, 501 is a bottom plate, 502 is a partition plate, 5021 is an air guide plate, 503 is a cover plate, 504 is an illuminating lamp, 505 is a discharge port, 506 is a temperature sensor, 507 is a PH sensor, and 508 is an illumination controller.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the invention comprises a carbon release module, a carbon flow guiding module and a carbon recovery module which are sequentially arranged from bottom to top, wherein the interior of the carbon release module is divided into a sewage treatment layer 1 at the lower side and a mud water separation layer 2 at the upper side through a sludge filler blocking net 201, an aeration head 1032 and an activated sludge input pipe 104 are arranged at the bottom of the sewage treatment layer 1, and a filtering membrane group 202 is arranged in the mud water separation layer 2; the inside of the carbon diversion module is divided into a separation gas collecting layer 3 at the lower side and a quantitative distribution layer 4 at the upper side by a middle partition plate, wherein an alkali liquor chamber 301 and an acid liquor chamber 303 are arranged in the separation gas collecting layer 3, a first diversion pipe 203 is arranged at one side of the muddy water separation layer 2, stretches into the separation gas collecting layer 3 and is connected with an input pipe 3011 of the alkali liquor chamber 301, an output end of the alkali liquor chamber 301 is connected with an input end of the acid liquor chamber 303 by a connection diversion pipe 302, a second diversion pipe 304 is arranged at one side of the separation gas collecting layer 3 and is communicated with the quantitative distribution layer 4, the second diversion pipe 304 is connected with an output pipe 3031 of the acid liquor chamber 303, in addition, a non-carbon dioxide gas collecting pipe 3012 is arranged in the alkali liquor chamber 301 and is communicated with the quantitative distribution layer 4, an alkali liquor flow valve 3021 is arranged on the connection diversion pipe 302, a carbon dioxide flow meter 305 is arranged on the second diversion pipe 304, and a non-carbon dioxide flow meter 3015 is arranged on the non-carbon dioxide gas collecting pipe 3012; the carbon recovery module comprises a plurality of photosynthetic metabolism layers 5, a third guide pipe 401 is arranged on one side of the quantitative distribution layer 4 and is communicated with the photosynthetic metabolism layers 5 at the bottommost layer, adjacent photosynthetic metabolism layers 5 are separated by a partition 502, one end of the partition 502 is provided with an air guide plate 5021 which is full of air holes, microalgae are cultivated in each photosynthetic metabolism layer 5, an illuminating lamp 504 is arranged on the inner wall of the carbon recovery module, each illuminating lamp 504 vertically penetrates through each photosynthetic metabolism layer 5, and the photosynthetic metabolism layer 5 at the uppermost side is communicated with the alkali liquor chamber 301 through a return pipe 402.
In this embodiment, as shown in fig. 1 to 3, a sewage input pipe 101 with a sewage pump 1011 is provided on one side of the sewage treatment layer 1, a sludge discharge pipe 105 with a sludge discharge pump 1051 is provided on the other side of the sewage treatment layer 1, an activated sludge input pipe 104 with a sludge inoculation pump 1041 is provided on one side of the bottom of the sewage treatment layer 1, an aeration pipe 103 with an aeration pump 1031 is provided on the other side of the bottom of the sewage treatment layer 1, each aeration head 1032 at the bottom of the sewage treatment layer 1 is supplied with air through the aeration pipe 103, a filtration manifold is provided at the bottom of the separation gas collection layer 3, as shown in fig. 3, a connection pipe 2021 is provided at the upper end of each group of filtration membrane groups 202 in the muddy water separation layer 2 and connected with the filtration manifold, and the output end of the filtration manifold is connected with a purified water output pipe 102 provided with a purified water outlet pump 1021.
When the sewage treatment device works, sewage is input into the sewage treatment layer 1 through the sewage input pipe 101, wherein solid part in the sewage cannot enter the mud-water separation layer 2 due to the blocking of the sludge filler blocking net 201, liquid part in the sewage enters the mud-water separation layer 2 through the sludge filler blocking net 201 to realize mud-water separation, liquid entering the mud-water separation layer 2 is filtered through the filtering membrane groups 202 to finally form purified water and flows out of the purified water output pipe 102, solid sludge remained in the sewage treatment layer 1 is discharged through the sludge discharge pipe 105, in addition, activated sludge for degrading organic substances is input into the sewage treatment layer 1 through the activated sludge input pipe 104, the organic substances in the sewage can be degraded by the activated sludge under the condition of aeration (air) to form carbon dioxide gas, and carbon dioxide gas generated in the sewage treatment layer 1 and air (mainly nitrogen and oxygen) remained by aeration can rise into the mud-water separation layer 2 and be output into the separation gas collection layer 3 through the first guide pipe 203. The filtration membrane module 202 and activated sludge are both well known in the art and commercially available products.
As shown in FIGS. 1 to 3, in the operation of the present invention, carbon dioxide gas generated in the sewage treatment layer 1 and aeration residual air (mainly nitrogen and oxygen) rise into the muddy water separation layer 2 and enter the lye chamber 301 in the separated gas collection layer 3 through the first flow guide pipe 203 and the input pipe 3011 for treatment, wherein CO 2 Enters the lye chamber 301 and reacts with OH within 24 hours - The reaction produces CO 3 2- While the rest of the non-carbon dioxide gas (containing N 2 、O 2 Etc.) then enters the dosing layer 4 via the non-carbon dioxide header 3012, CO 2 The gas is absorbed by alkali liquor to generate CO 3 2- Then the mixture goes on to enter the acid liquor chamber 303, and acid-base neutralization reaction, namely CO, occurs in the acid liquor chamber 303 3 2- +H + →CO 2 +H 2 O, then regenerated CO 2 The gas enters the quantitative distribution layer 4 through the second flow guide pipe 304, the non-carbon dioxide flow meter 3015 detects the flow of the non-carbon dioxide gas generated in the alkali liquor chamber 301 and flowing into the quantitative distribution layer 4 in real time, the carbon dioxide flow meter 305 monitors the flow of the carbon dioxide gas output by the acid liquor chamber 303 and flowing into the quantitative distribution layer 4 in real time, and the flow rate of the liquid entering the acid liquor chamber 303 is controlled through the alkali liquor flow valve 3021, so that the flow rate of the liquid can be controlledThe flow rate of carbon dioxide gas produced into the dosing layer 4 is such that a re-dosing of non-carbon dioxide gas and carbon dioxide gas in the dosing layer 4 can be achieved as desired to obtain the desired carbon dioxide gas concentration. The carbon dioxide flow meter 305, the non-carbon dioxide flow meter 3015 and the lye flow valve 3021 are all well known in the art and commercially available products, and in addition, a one-way valve is provided on each flow guide tube to ensure that the gas flows unidirectionally to prevent backflow, which is well known in the art.
As shown in fig. 2, one side of the lye chamber 301 is provided with a one-way exhaust pipe 3013 for exhausting residual gas, the other side of the lye chamber 301 is provided with a lye injection port 3014 for supplementing lye, one side of the lye chamber 303 is provided with an acid liquor injection port 3032 for supplementing acid liquor, and the other side of the lye chamber 303 is provided with a salt exhaust port 3033 for exhausting residual substances.
As shown in fig. 2, a pressure gauge 403 is disposed on one side of the dosing chamber 4 for monitoring the internal pressure in real time, and a safety pressure reducing port 404 is disposed on the other side of the dosing chamber 4 for safety pressure reduction.
As shown in fig. 1 to 3, the carbon recovery module comprises a plurality of photosynthetic and metabolic layers 5, wherein the lowest photosynthetic and metabolic layer 5 is separated from the quantitative distribution layer 4 by a bottom plate 501, the adjacent photosynthetic and metabolic layers 5 are separated by a partition plate 502, one end of the partition plate 502 is provided with a gas guide plate 5021 which is fully distributed with ventilation through holes, thus gas can rise layer by layer, and microalgae are arranged on the bottom plate 501 and the partition plate 502.
The invention utilizes photosynthesis of microalgae to absorb and consume CO in gas 2 Further realizing the purpose of zero carbon emission, wherein the microalgae growth process needs illumination, but the illumination time is not longer and better, but the illumination time and the dark time are alternately carried out, so that a so-called photoperiod and a dark period are formed, wherein during the photoperiod, the microalgae is mixed with CO under the illumination condition 2 Photosynthesis is performed by CO 2 Synthesizing organic matters required by self-propagation, thereby removing CO 2 In dark period, the microalgae breathe under no light condition to decompose organic matters to release CO 2 However, since the photosynthesis intensity is higher than the respiration intensity, the microalgae consume CO in the photoperiod 2 Far greater than the CO released during the dark period 2 So the net appearance is that CO is consumed 2 Thereby realizing CO 2 Zero emissions to the atmosphere. CO needed by different periods of microalgae 2 The concentration is different, so the invention utilizes the adjustment of the quantitative distribution layer 4 to meet the CO with different periods of microalgae 2 In this embodiment, the light cycle in the carbon recovery module is that the illumination lamp 504 is turned on to perform illumination culture for 12-16 hours, and the dark cycle is that the illumination lamp 504 is turned off to perform dark culture for 8-12 hours, wherein the CO in the supplied gas is required to be ensured in the light cycle of the stable culture stage 2 The concentration reaches 3 to 10 percent, and CO in the gas is supplied in the dark period of the stable culture stage 2 The concentration reaches 0.03 to 0.5 percent, and in addition, in the photoperiod aiming at the inoculation replacement stage, the CO in the supplied gas needs to be ensured 2 The concentration reaches 0.5-3%, and CO in the gas is supplied in the dark period of the inoculation replacement stage 2 The concentration reaches 0.03% -0.05%.
As shown in fig. 1, a cover plate 503 capable of being turned and opened is provided at the upper end of the carbon recovery module to perform operations such as placing microalgae, a temperature sensor 506 and a PH sensor 507 are provided inside the carbon recovery module to monitor temperature and PH in real time, and an illumination controller 508 is provided at the upper end of the carbon recovery module to control illumination intensity of each illumination lamp 504. In addition, the uppermost photosynthetic metabolic layer 5 is communicated with the lye chamber 301 through a return pipe 402 so as to make the residual carbon dioxide gas reenter the lye chamber 301, thereby realizing the cyclic treatment. The temperature sensor 506, PH sensor 507, and illumination controller 508 are all well known in the art and commercially available.
The working principle of the invention is as follows:
when the sewage treatment device works, sewage in the sewage treatment layer 1 realizes mud-water separation through the sludge filler blocking net 201, liquid entering the mud-water separation layer 2 is filtered by each group of filtering membrane groups 202 to finally form purified water which flows out of the purified water output pipe 102, and in addition, the sewage treatment layer 1 utilizes activated sludge to degrade organic matters in the sewageAnd organic matters in the sewage are degraded by the activated sludge under the aeration (air) condition to form carbon dioxide gas, and the carbon dioxide gas and the rest of the aeration (mainly nitrogen and oxygen) rise into the mud-water separation layer 2 and then enter the separation gas collecting layer 3 through the first guide pipe 203. The invention utilizes photosynthesis of microalgae to absorb and consume CO in gas 2 Thereby realizing the aim of zero carbon emission, but CO required by microalgae in different periods 2 The concentration is different, so the invention utilizes the carbon diversion module to realize quantitative redistribution of carbon dioxide gas and other gases so as to meet the CO required by microalgae 2 Concentration requirement, wherein a separation gas collection layer 3 is used to separate non-carbon dioxide gas from carbon dioxide gas, CO 2 Enters the alkali liquor chamber 301 to react with OH-in 24 hours to generate CO 3 2 -, while the remaining non-carbon dioxide gas (comprising N 2 、O 2 Etc.) then enter the quantitative distribution layer 4 through the non-carbon dioxide gas collecting pipe 3012, and the acid-base neutralization reaction, namely CO, occurs in the acid liquid chamber 303 3 2 -+H + →CO 2 +H 2 O, then regenerated CO 2 The gas enters the quantitative distribution layer 4 through the second flow guide pipe 304, the flow of the non-carbon dioxide gas flowing into the quantitative distribution layer 4 is monitored in real time through the non-carbon dioxide flow meter 3015, and the flow of the CO flowing into the quantitative distribution layer 4 is monitored in real time through the carbon dioxide flow meter 305 2 The flow rate of the gas is controlled by the alkali liquor flow valve 3021 to control the flow rate of the liquid entering the acid liquor chamber 303, so that the flow rate of the carbon dioxide entering the quantitative distribution layer 4 can be controlled, and thus, the non-carbon dioxide gas and the carbon dioxide gas can be quantitatively distributed again in the quantitative distribution layer 4 according to the needs, so as to obtain the required concentration of the carbon dioxide gas, and further, the gas supply needs of different periods of microalgae of each photosynthetic metabolic layer 5 in the carbon recovery module can be satisfied. In addition, the uppermost photosynthetic metabolic layer 5 is communicated with the lye chamber 301 through a return pipe 402 so as to make the residual carbon dioxide gas reenter the lye chamber 301, thereby realizing the cyclic treatment.
The working principle of the invention is further described below by way of an example of application.
The sewage to be treated in the application example comes from the cultivation wastewater discharged from a certain cultivation farm, the water inflow index is shown in the following table 1, and the COD content of the water inflow is 454.9 mg.L- 1 ，BOD 5 The oxygen demand of the waste water is 163.8 mg.L- 1 Suspended Solids (SS) of 216.1 mg.L- 1 The Total Nitrogen (TN) content was 31.2 mg.L- 1 Ammonia Nitrogen (NH) 3 N) content of 20.1 mg.L- 1 。
TABLE 1
In this application example, the activated sludge in the sewage treatment layer 1 of the carbon release module is activated sludge which is cultivated and domesticated in a targeted manner, and in this embodiment, a sequencing batch sewage treatment operation mode is adopted to examine the sewage index parameter change and the microalgae content and growth state in the carbon recovery system in 2 operation periods of 18d (days) microalgae cultivation.
In this application example, activated sludge was inoculated into a sewage treatment layer 1 having a total volume of 50L, and the inoculum size was 1260 mg.L in terms of the mixed liquor suspended solid concentration (MLSS) -1 Pumping sewage 40L to be treated into the sewage treatment layer 1, starting an aeration pump 1031 to perform aeration treatment for 24 hours, closing the aeration pump 1031 after the treatment is finished, standing for precipitation, starting a water outlet pump 1021 to drain water, and then starting a sewage pump 1011 to enter the next sewage treatment period. The relevant parameters are shown in table 2 below.
TABLE 2
In addition, the photosynthetic metabolic layer 5 of the carbon recovery module is inoculated with microalgae which are cultivated in advance. In the application example, the microalgae species used is chlorella (Chlorella vulgaris), and the optimal culture conditions are as follows: the temperature is 25 ℃, the pH is 8.9, and the illumination intensity is 4000lux (lux, illuminance unit). Chlorella cultured for 72h (hr) in an activated manner was inoculated into fresh culture medium of the carbon recovery module at a ratio of 1:5 (cultured algae solution: fresh culture solution), and the culture solution used in this application example was BG11 medium. After inoculation, the carbon recovery module was started to run under light conditions with alternating photoperiod (16 hours) and dark period (8 hours), where the first 2 days are the adaptation phase of inoculation, the last 7 days are the stationary phase of cultivation, and one run period is 9 days. After 9 days of operation, 4/5 of the algae liquid is discharged from the liquid outlet, and 4/5 of the fresh culture liquid is injected to continue the next culture period.
In one sewage treatment period, simultaneously starting a carbon release module, a carbon diversion module and a carbon recovery module, wherein in the carbon diversion module, CO is regulated and controlled by a carbon dioxide flowmeter 305 and a non-carbon dioxide flowmeter 3015 respectively 2 non-CO 2 The gas flow of the gas flows into the dosing layer 4. In the application example, in the inoculation replacement period of microalgae culture, CO is used in the photoperiod 2 Flowmeter and non-CO 2 The flow rate ratio of the flowmeter is controlled to be 0.3:9.7, and the mixed CO flows into the quantitative distribution layer 4 2 Concentration reaches 3%, CO in dark period 2 Flowmeter and non-CO 2 The flow rate ratio of the flowmeter is controlled to be 0.05:99.95, and the mixed CO flows into the quantitative distribution layer 4 2 The concentration reaches 0.05 percent. For the stationary phase of microalgae culture, CO in the illumination period 2 Flowmeter and non-CO 2 The flow rate ratio of the flowmeter is controlled to be 1:9, and the mixed CO flows into the quantitative distribution layer 4 2 Concentration reaches 10%, CO in dark period 2 Flowmeter and non-CO 2 The flow rate ratio of the flowmeter is controlled to be 0.05:99.95, and the mixed mixture flows into CO 2 Metering CO within layer 4 2 The concentration reaches 0.05 percent.
At the same time, for CO 2 Is provided, the lye flow valve 3021 is directed to different CO's respectively 2 Flow demand, setting the alkali liquor flow rate. In this example, the alkali solution in the alkali solution chamber 301 is 0.5L of NaOH (sodium hydroxide) solution with a concentration of 3M (mol/L), and the alkali solution in the acid solution chamber 303 is 0.5L of 2M (mol/L) H 3 PO 4 (phosphoric acid) solution, the flow rate of the alkali solution flow valve 3021 was set to 0.5 mL/min during the illumination period of the inoculation replacement period -1 In the dark period of the inoculation replacement period, the flow speed of the alkali liquor flow valve 3021 is setSetting the solution at 0.05 mL/min -1 . In the illumination period of the steady operation period, the flow speed of the alkali liquor flow 3021 valve is set to be 0.025 mL-min -1 In the dark period of the steady operation period, the flow rate of the alkali liquor flow valve 3021 is set to 0.0025 mL/min -1 。
The change of Total Organic Carbon (TOC) content and the change of residual average value with treatment time in each sewage treatment period (24 h) are observed as shown in FIG. 4, and the result shows that the TOC content tends to the limit value at the end of the period in each 24h treatment period, namely, the TOC is approximately fully mineralized into CO 2 Indicating that the treatment endpoint was reached. The detection indexes of the effluent in the sewage treatment layer 1 are shown in the table 1, and the COD content is 38mg.L -1 ，BOD 5 9.2 mg.L -1 Suspended Solids (SS) of 8.6mg.L -1 The Total Nitrogen (TN) content was 12.6mg.L -1 Ammonia Nitrogen (NH) 3 -N) content of 4.2 mg.L -1 Meets the first-level A standard of pollutant emission standard of urban sewage treatment plant (GB 18918-2002).
In the carbon recovery module, the biomass of microalgae accumulated over the entire 9-day operating cycle 600 The absorbance (absorbance of liquid at 600 nm) is shown in fig. 5, and the characteristic of change along with treatment time is shown in the graph, the microalgae biomass is subjected to exponential growth phase and stationary phase from the initial inoculation adaptation phase, the experimental tail sound approaches to the decay phase, the carbon recovery module operation limit is reached, if continuous operation is required, the microalgae biomass needs to be updated, and the next inoculation updating period is entered. Through carbon balance, as shown in FIG. 6, CO in the carbon release module 2 Is integrated with the CO in the carbon recovery module 2 The utilization accumulation amount of the raw materials which are anabolized by the microalgae is approximately equal, thereby showing that the zero-carbon emission sewage treatment system of the invention not only has the basic function of sewage treatment, but also realizes the utilization of CO 2 The carbon emission reduction targets of the form cycle.
Claims (10)
1. A sewage treatment system with zero carbon emission is characterized in that: the sewage treatment device comprises a carbon release module, a carbon diversion module and a carbon recovery module which are sequentially arranged from bottom to top, wherein the interior of the carbon release module is divided into a sewage treatment layer (1) at the lower side and a mud-water separation layer (2) at the upper side through a mud filler blocking net (201), an aeration head (1032) and an activated sludge input pipe (104) are arranged at the bottom of the sewage treatment layer (1), and a filtering membrane group (202) is arranged in the mud-water separation layer (2); the carbon flow guide module comprises a separation gas collecting layer (3) at the lower side and a quantitative distribution layer (4) at the upper side, an alkali liquor chamber (301) and an acid liquor chamber (303) are arranged in the separation gas collecting layer (3), a first flow guide pipe (203) is arranged at one side of the muddy water separation layer (2) and stretches into the separation gas collecting layer (3) and is connected with an input pipe (3011) of the alkali liquor chamber (301), the output end of the alkali liquor chamber (301) is connected with the input end of the acid liquor chamber (303) through a connection flow guide pipe (302), a second flow guide pipe (304) is arranged at one side of the separation gas collecting layer (3) and is communicated with the quantitative distribution layer (4), a non-carbon dioxide gas collecting pipe (3012) is arranged on the alkali liquor chamber (301) and is communicated with the quantitative distribution layer (4), a flow guide valve (3021) is arranged on the connection flow guide pipe (302), a flow meter (305) is arranged on the output end of the alkali liquor chamber (301), and a non-carbon dioxide flow meter (3015) is arranged on the alkali liquor chamber (301); the carbon recovery module comprises a plurality of photosynthetic metabolism layers (5), and one side of the quantitative distribution layer (4) is provided with a third guide pipe (401) which is communicated with the photosynthetic metabolism layer (5) at the bottommost layer, the adjacent photosynthetic metabolism layers (5) are separated by a partition plate (502), one end of the partition plate (502) is provided with a gas guide plate (5021) which is fully provided with ventilation holes, microalgae are cultivated in each photosynthetic metabolism layer (5), an illuminating lamp (504) is arranged on the inner wall of the carbon recovery module, the illuminating lamp (504) penetrates through each photosynthetic metabolism layer (5), and the photosynthetic metabolism layer (5) at the uppermost side is communicated with the alkali liquor chamber (301) through a return pipe (402).
2. The zero carbon emission wastewater treatment system of claim 1, wherein: the sewage treatment layer (1) is provided with a sewage input pipe (101) and a sludge discharge pipe (105), the bottom of the separation gas collecting layer (3) is provided with a filtering main pipe, the upper ends of each group of filtering membrane groups (202) in the sludge-water separation layer (2) are respectively provided with a connecting pipe (2021) connected with the filtering main pipe, and the output end of the filtering main pipe is connected with a purified water output pipe (102).
3. The zero carbon emission wastewater treatment system of claim 1, wherein: an aeration pipe (103) with an aeration pump (1031) is arranged at the bottom of the sewage treatment layer (1), and each aeration head (1032) at the bottom of the sewage treatment layer (1) is supplied with air through the aeration pipe (103).
4. The zero carbon emission wastewater treatment system of claim 1, wherein: one side of the alkali liquor chamber (301) is provided with a one-way exhaust pipe (3013), and the other side is provided with an alkali liquor injection port (3014).
5. The zero carbon emission wastewater treatment system of claim 1, wherein: one side of the acid liquor chamber (303) is provided with an acid liquor injection port (3032), and the other side is provided with a salt discharge port (3033).
6. The zero carbon emission wastewater treatment system of claim 1, wherein: one side of the quantitative distribution layer (4) is provided with a pressure gauge (403), and the other side is provided with a safe decompression opening (404).
7. The zero carbon emission wastewater treatment system of claim 1, wherein: the carbon recovery module comprises a plurality of photosynthetic metabolism layers (5), wherein the lowest photosynthetic metabolism layer (5) is separated from the quantitative distribution layer (4) through a bottom plate (501), adjacent photosynthetic metabolism layers (5) are separated through a partition plate (502), and microalgae are arranged on the bottom plate (501) and the partition plate (502).
8. The zero carbon emission wastewater treatment system of claim 1, wherein: the carbon recovery module upper end is equipped with apron (503) that can overturn and open, inside temperature sensor (506) and the PH sensor (507) that are equipped with of carbon recovery module, in addition be equipped with illumination controller (508) of control each light (504) illumination intensity on the carbon recovery module.
9. The zero carbon emission wastewater treatment system of claim 1, wherein: in the sewage treatment layer (1), organic matters in the sewage are degraded by activated sludge under aeration conditions to form carbon dioxide gas, and the carbon dioxide gas generated in the sewage treatment layer (1) and the rest of aeration rise and pass through the first guide pipe (203) and the input pipe (3011) to enter an alkali liquor chamber (301) of the separation gas collection layer (3), wherein the carbon dioxide enters the alkali liquor chamber (301) and then enters the reaction chamber (301) to react with OH - The reaction produces CO 3 2- The rest of the non-carbon dioxide gas enters the quantitative distribution layer (4) through the non-carbon dioxide gas collecting pipe (3012), and CO 2 The gas is absorbed by alkali liquor to generate CO 3 2- Then continuously enter the acid liquor chamber (303) and undergo acid-base neutralization reaction, namely CO, in the acid liquor chamber (303) 3 2- +H + →CO 2 +H 2 O, then regenerated CO 2 The gas enters the quantitative distribution layer (4) through a second flow guide pipe (304).
10. The zero carbon emission wastewater treatment system of claim 1, wherein: the microalgae growth process comprises a photoperiod of an inoculation replacement phase, a dark period of the inoculation replacement phase, a photoperiod of a stable culture phase and a dark period of the stable culture phase.
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| CN116500210A (en) * | 2023-06-28 | 2023-07-28 | 四川发展环境科学技术研究院有限公司 | Carbon emission reduction accounting device |
| CN116500210B (en) * | 2023-06-28 | 2023-08-25 | 四川发展环境科学技术研究院有限公司 | Carbon emission reduction accounting device |
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