CN115475503A - Three-dimensional electrode biomembrane reaction device and method for removing chlorobenzene waste gas by using same - Google Patents
Three-dimensional electrode biomembrane reaction device and method for removing chlorobenzene waste gas by using same Download PDFInfo
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- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 239000002912 waste gas Substances 0.000 title claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 45
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 51
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
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- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 6
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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
- B01D53/68—Halogens or halogen compounds
- B01D53/70—Organic halogen compounds
-
- 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
- B01D53/32—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 by electrical effects other than those provided for in group B01D61/00
-
- 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
- B01D53/85—Biological processes with gas-solid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/95—Specific microorganisms
-
- 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
Abstract
The invention provides a three-dimensional electrode biomembrane reaction device and a method for removing chlorobenzene waste gas by using the same, and relates to the technical field of environmental engineering. The three-dimensional electrode biofilm reaction device comprises a reactor (1), wherein a nutrient solution storage area (5), an air inlet area (2), a reaction area (3) and a nutrient solution spraying area (4) are arranged in the reactor (1) from bottom to top; a nano aeration head (2-3) is arranged in the air inlet area (2), and the nano aeration head (2-3) is communicated with the air inlet pipe (2-1) through a through-plate thread through (2-2); a cathode plate (3-1), an anode plate (3-2) and a three-dimensional particle electrode (3-3) are arranged in the reaction zone (3); the gas inlet zone (2) is separated from the reaction zone (3) by a porous sieve plate (3-4). The reaction device can effectively remove chlorobenzene waste gas.
Description
Technical Field
The invention relates to the technical field of environmental engineering, in particular to a three-dimensional electrode biomembrane reaction device and a method for removing chlorobenzene waste gas by using the same.
Background
Chlorobenzene has high volatility, hydrophobicity, exogenesis and durability, high stability in environment, strong bioaccumulation and difficult treatment. Therefore, the development of economical and efficient chlorobenzene waste gas treatment technology is urgently needed. Many current chlorobenzene treatment technologies include: condensation, adsorption, incineration, catalytic combustion, catalytic reduction, ultraviolet photolysis, biological methods, and the like. The existing treatment technologies have the defects of low treatment efficiency, high cost, easy generation of secondary pollutants and the like.
The biological method for treating volatile organic compounds has the characteristics of low investment, low operating cost, no secondary pollution and the like. However, for hydrophobic or volatile organic compounds which are difficult to degrade, the toxicity of the volatile organic compounds can inhibit the activity of microorganisms, and the treatment effect of the conventional biological treatment technology is not ideal, so that the treatment efficiency of the biological method is influenced.
Therefore, a method for removing chlorobenzene waste gas with high efficiency, simple equipment and no pollution is needed to make up for the defects of the prior art.
Disclosure of Invention
The invention aims to provide a three-dimensional electrode biomembrane reaction device and a method for removing chlorobenzene waste gas by using the same.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a three-dimensional electrode biofilm reaction device, which comprises a reactor 1, wherein a nutrient solution storage area 5, an air inlet area 2, a reaction area 3 and a nutrient solution spraying area 4 are arranged in the reactor 1 from bottom to top;
a nano aeration head 2-3 is arranged in the air inlet area 2, and the nano aeration head 2-3 is directly connected with an air inlet pipe 2-1 through a through-plate thread 2-2;
a cathode plate 3-1, an anode plate 3-2 and a three-dimensional particle electrode 3-3 are arranged in the reaction zone 3;
the gas inlet zone 2 and the reaction zone 3 are separated by a porous sieve plate 3-4;
a spray head 4-1 is arranged in the nutrient solution spray area 4;
the nutrient spraying area 4 is communicated with the reaction area 3;
the nutrient spraying liquid storage area 5 is separated from the air inlet area 2 by a porous sieve plate 3-5.
Preferably, the reactor 1 is also connected with a gas making device;
the reactor 1 is connected with a gas making device through an air inlet pipe 2-1;
the gas making device comprises a chlorobenzene waste gas generating device and an oxygen generating device;
the device for generating chlorobenzene waste gas comprises an injection pump 7, a gas generator 8, a mass flow controller 9-1, a gas washing bottle 11-2 and a mass flow controller 9-3 which are sequentially connected in series;
the device for generating oxygen comprises an oxygen pump 10, a gas washing bottle 11-1, a mass flow controller 9-2, a gas washing bottle 11-2 and a mass flow controller 9-3 which are sequentially connected in series;
the device for generating chlorobenzene waste gas and the device for generating oxygen are connected in parallel at the positions where the mass flow controller 9-1 and the mass flow controller 9-2 are respectively connected with the gas washing bottle 11-2.
Preferably, the cathode plate 3-1 is a stainless steel net bonded with a viscose-based activated carbon felt;
the specific surface area of the viscose-based activated carbon felt is 1300-1500 m 2 /g；
The anode plate 3-2 is a twill 3K carbon fiber plate bonded with the viscose-based activated carbon felt;
the specific surface area of the viscose-based activated carbon felt is 1300-1500 m 2 /g；
The distance between the cathode plate 3-1 and the anode plate 3-2 is 8-10 cm;
the cathode plate 3-1 and the anode plate 3-2 are respectively connected with the cathode and the anode of the direct current power supply 12 through leads;
the dc power supply 12 is located outside the reactor 1.
Preferably, the three-dimensional particle electrode 3-3 is conductive column-shaped activated carbon;
the diameter of the conductive column-shaped activated carbon is 3.5-4.5 mm;
the specific surface area of the conductive column active carbon is 1000-1200 m 2 /g。
Preferably, the spray header 4-1 is connected with a peristaltic pump 13 through a rubber tube;
the peristaltic pump 13 is connected with the liquid inlet and outlet 5-2 of the liquid storage tank 5-1 through a rubber tube;
the peristaltic pump 13 is located outside the reactor 1.
Preferably, the top of the reactor 1 is provided with an air outlet 6 and an air outlet monitoring port 14.
The invention also provides a method for removing chlorobenzene waste gas by using the three-dimensional electrode biomembrane reaction device, which comprises the following steps:
and (3) injecting reaction liquid into the reactor, reacting for 20-28 h, discharging the reaction liquid, adding nutrient liquid into the reactor, introducing waste gas, turning on a direct-current power supply, and reacting to remove chlorobenzene waste gas.
Preferably, the reaction solution is a bacterial solution;
the dominant phylum contained in the bacterial liquid is proteobacteria, and the dominant genus is in rhodococcus.
Preferably, the nutrient solution takes water as a solvent, and further comprises the following components in concentration:
0-250 mg/L glucose, 14-16 mg/L K 2 HPO 4 、6～8mg/L KCl、4～5mg/L MnSO 4 ·H 2 O、18～22mg/L NaHCO 3 、7～8mg/L ZnSO 4 ·7H 2 O、1.5～2.5mg/L NH 4 Cl、2～3mg/L MgSO 4 、4～6mg/L CoCl 2 ·6H 2 O、2～2.4mg/L FeSO 4 、3.5～3.9mg/L CaCl 2 、2.8～3.0mg/L FeCl 3 。
Preferably, the nutrient solution is added into the reactor through a spray header 4-1;
the spraying intensity of the nutrient solution is 2.8-3.2L/h;
spraying the nutrient solution for 1 time every 3.8-4.2 h;
the time for spraying the nutrient solution is 4-10 min each time;
the waste gas is introduced into the reactor from an air inlet pipe 2-1 through a gas making device;
the flow rate of the waste gas during the introduction is 0.35-0.45L/min;
the inlet concentration of the chlorobenzene waste gas is 0 to 3.0g/m 3 ；
The current density of the direct current power supply is 0-0.33A/m 2 。
The invention provides a three-dimensional electrode biomembrane reaction device and a method for removing chlorobenzene waste gas,
the three-dimensional electrode biomembrane reaction device of the invention combines the electrochemical technology and the biomembrane technology to form the three-dimensional electrode biomembrane technology. The three-dimensional particle electrode has the conductive function, improves the unit effective reaction area of the electrolytic cell, obviously improves the mass transfer function, and is especially suitable for hydrophobic organic pollutants. Meanwhile, the huge specific surface area of the three-dimensional particle electrode provides a place for the growth and breeding of microorganisms, a biological membrane is formed, the activity of the biological membrane is improved under the action of electricity, and the number of functional bacteria is increased. In addition, the reducing atmosphere and the oxidizing atmosphere formed by the cathode and the anode respectively have an accelerating effect on degradation reactions such as enzymatic hydrolysis and oxidation reduction of organic matters.
The technology for treating chlorobenzene waste gas by using the three-dimensional electrode biomembrane effectively increases gas-liquid mass transfer, reduces energy consumption, improves the removal effect of chlorobenzene waste gas, and has the advantages of high efficiency, low consumption, no by-product, simple and convenient operation and low cost.
When the system runs for a certain time, the thickness of the biological membrane is increased, the voltage is increased, the biological membrane has the aging phenomenon, the function of the three-dimensional particle electrode is reduced, the mass transfer effect is reduced, and the treatment effect of the system is poor. At this time, the current density is set to 0.35 to 0.40A/m 2 Reacting for 3-5 min, circulating for 4-6 times,the self-cleaning function can be realized, and the system can be kept to stably run for a long time.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional electrode biofilm reactor (wherein 1 represents a reactor, 2 represents an air inlet region, 3 represents a reaction region, 4 represents a nutrient solution spray region, 5 represents a nutrient solution storage region, 6 represents an air outlet, 7 represents an injection pump, 8 represents a gas generator, 9 represents a mass flow controller, 10 represents an oxygen pump, 11 represents a gas washing bottle, 12 represents a direct current power supply, 13 represents a peristaltic pump, 14 represents an air outlet monitoring port, 2-1 represents an air inlet pipe, 2-2 represents a through-plate screw thread through-way, 2-3 represents a nano aeration head, 3-1 represents a cathode plate, 3-2 represents an anode plate, 3-3 represents a three-dimensional particle electrode, 3-4 and 3-5 represent porous sieve plates, 4-1 represents a spray head, 5-1 represents a liquid storage tank, and 5-2 represents a liquid inlet and outlet).
Detailed Description
The invention provides a three-dimensional electrode biomembrane reaction device, which comprises a reactor 1, wherein a nutrient solution storage area 5, an air inlet area 2, a reaction area 3 and a nutrient solution spraying area 4 are arranged in the reactor 1 from bottom to top;
a nano aeration head 2-3 is arranged in the air inlet area 2, and the nano aeration head 2-3 is connected with an air inlet pipe 2-1 through a through-plate thread through 2-2;
a cathode plate 3-1, an anode plate 3-2 and a three-dimensional particle electrode 3-3 are arranged in the reaction area 3;
the gas inlet zone 2 and the reaction zone 3 are separated by a porous sieve plate 3-4;
a spray head 4-1 is arranged in the nutrient solution spray area 4;
the nutrient spraying area 4 is communicated with the reaction area 3;
the nutrient spraying liquid storage area 5 is separated from the air inlet area 2 by a porous sieve plate 3-5.
In the invention, the reactor 1 is connected with a gas making device;
the reactor 1 is communicated with a gas making device through an air inlet pipe 2-1;
the gas making device comprises a chlorobenzene waste gas generating device and an oxygen generating device;
the device for generating chlorobenzene waste gas sequentially comprises an injection pump 7, a gas generator 8, a mass flow controller 9-1, a gas washing bottle 11-2 and a mass flow controller 9-3 in series;
the device for generating oxygen comprises an oxygen pump 10, a gas washing bottle 11-1, a mass flow controller 9-2, a gas washing bottle 11-2 and a mass flow controller 9-3 which are sequentially connected in series;
the device for generating chlorobenzene waste gas and the device for generating oxygen are connected in parallel at the positions where the mass flow controller 9-1 and the mass flow controller 9-2 are respectively connected with the gas washing bottle 11-2.
And a mass flow controller 9-3 in the gas making device is connected with the gas inlet pipe 2-1 through a rubber pipe.
In the invention, the cathode plate 3-1 is a stainless steel mesh bonded with a viscose-based activated carbon felt; the stainless steel net is a 316L, 30-mesh and 30-wire stainless steel net; the specific surface area of the viscose-based activated carbon felt is 1300-1500 m 2 A ratio of/g, preferably 1400m 2 (ii) in terms of/g. The anode plate 3-2 is a twill 3K carbon fiber plate bonded with the viscose-based activated carbon felt; the specific surface area of the viscose-based activated carbon felt is 1300-1500 m 2 A ratio of/g, preferably 1400m 2 (ii) in terms of/g. The distance between the cathode plate 3-1 and the anode plate 3-2 is 8-10 cm, preferably 9cm; the cathode plate 3-1 and the anode plate 3-2 are respectively connected with the cathode and the anode of the direct current power supply 12 through leads; the dc power supply 12 is located outside the reactor 1.
In the invention, the three-dimensional particle electrode 3-3 is conductive column-shaped activated carbon; the diameter of the conductive column-shaped active carbon is 3.5-4.5 mm, preferably 4.0mm; the specific surface area of the conductive column active carbon is 1000-1200 m 2 A/g, preferably 1100m 2 /g。
In the invention, the spray header 4-1 is connected with a peristaltic pump 13 through a rubber tube;
the peristaltic pump 13 is connected with the liquid inlet and outlet 5-2 of the liquid storage tank 5-1 through a rubber tube;
the peristaltic pump 13 is located outside the reactor 1.
In the present invention, the top of the reactor 1 is provided with an air outlet 6 and an air outlet monitoring port 14.
The invention also provides a method for removing chlorobenzene waste gas by using the three-dimensional electrode biomembrane reaction device, which comprises the following steps:
and (3) injecting reaction liquid into the reactor, reacting for 20-28 h, discharging the reaction liquid, adding nutrient liquid into the reactor, introducing waste gas, turning on a direct current power supply, and reacting to remove chlorobenzene waste gas.
In the invention, the reaction liquid is a bacterial liquid;
the dominant phylum contained in the bacterial liquid is proteobacteria, and the dominant genus is Rhodococcus.
In the invention, the preparation method of the bacterial liquid comprises the following steps: some of the prior art proteobacteria belong to the genus, and bacteria in the rhodococcus are mixed with nutrient solution to obtain bacterial liquid; or taking sludge from a secondary sedimentation tank of a sewage treatment plant, and culturing and acclimating to obtain bacterial liquid.
The method for obtaining the bacterial liquid by domestication comprises the following steps: (1) Taking sludge in a secondary sedimentation tank of a sewage treatment plant, carrying out aeration treatment for 22-26 h, adding a nutrient solution, keeping the COD (chemical oxygen demand) to N: P in the sludge to be 100.
The polysaccharide content of the bacteria in the bacteria liquid is 30.0-33.0 mg/gVSS; the protein content is 44.4-50.5 mg/gVSS;
in the present invention, the microbial community structure in the bacterial liquid is: OUTs of 976.00, shannon index of 5.13, proteobacteria of 60.42%, rhodococcus of the genus Primordial of 60.04%.
In the invention, the nutrient solution takes water as a solvent and also comprises the following components in concentration:
0 to 250mg/L glucose, preferably 125mg/L glucose;
14～16mg/LK 2 HPO 4 preferably 15mg/L;
6-8 mg/L KCl, preferably 7mg/L;
4～5mg/L MnSO 4 ·H 2 o, preferably 4.5mg/L;
18～22mg/L NaHCO 3 preferably 20mg/L;
7～8mg/L ZnSO 4 ·7H 2 o, preferably 7.5mg/L;
1.5～2.5mg/L NH 4 cl, preferably 2mg/L;
2～3mg/L MgSO 4 preferably 2.5mg/L;
4～6mg/L CoCl 2 ·6H 2 o, preferably 5mg/L;
2～2.4mg/L FeSO 4 preferably 2.2mg/L;
3.5～3.9mg/L CaCl 2 preferably 3.7mg/L;
2.8～3.0mg/L FeCl 3 preferably 2.9mg/L.
In the invention, the nutrient solution is added into the reactor through a spray header 4-1;
the spraying strength of the nutrient solution is 2.8-3.2L/h, preferably 3.0L/h; spraying the nutrient solution for 1 time every 3.8-4.2 h, preferably spraying the nutrient solution for 1 time every 4 h; the time for spraying the nutrient solution is 4-10 min, preferably 7min; the waste gas is introduced into the reactor through a gas making device through an air inlet pipe 2-1; the flow rate of the waste gas during the introduction is 0.35-0.45L/min, preferably 0.4L/min; the concentration of the chlorobenzene waste gas is 0 to 3.0g/m 3 Preferably 1 to 2g/m 3 。
The current density of the direct current power supply is 0-0.33A/m 2 。
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
The removal rate in examples = [ (content of chlorobenzene off-gas introduced before treatment-content of chlorobenzene off-gas after treatment)/content of chlorobenzene off-gas introduced before treatment ] × 100%.
The reactor in the embodiment of the invention is made of organic glass, the length of the reactor is 14.0cm, the width of the reactor is 14.0cm, the height of the reactor is 24.5cm, the thickness of the reactor is 1.0cm, and the effective working volume of the reactor is 2.5L.
In the embodiment of the invention, the reactor is a four-layer porous cuboid without an upper cover.
Example 1
The device for removing chlorobenzene waste gas is arranged as follows: comprises a reactor 1, a gas making device, a direct current power supply, a nutrient solution storage tank and a peristaltic pump. The reactor 1 is internally provided with an air inlet area 2, a reaction area 3, a nutrient solution spraying area 4 and a nutrient solution storage area 5; a nano aeration head 2-3 is arranged in the air inlet area 2, and the nano aeration head 2-3 is communicated with an air inlet pipe 2-1 through a through-plate thread straight-through 2-2; an anode plate 3-2 of a 3K carbon fiber plate bonded with a twill of the viscose-based activated carbon felt, a cathode plate 3-1 of a stainless steel net bonded with the viscose-based activated carbon felt and a three-dimensional particle electrode 3-3 of conductive column-shaped activated carbon are arranged in the reaction zone 3; the specific surface area of the viscose-based activated carbon felt is 1400m 2 (ii)/g; the specific surface area of the viscose-based activated carbon felt is 1400m 2 (ii)/g; the stainless steel net is a 316L stainless steel net with 30 meshes and 30 wires, and the diameter of the conductive column-shaped activated carbon is 4.0mm; the specific surface area of the conductive column activated carbon is 1100m 2 (iv) g; the distance between the anode plate and the cathode plate is 10cm. The anode plate and the cathode plate are connected with the anode and the cathode of a direct current power supply 12 positioned outside the reactor 1. The gas inlet zone 2 and the reaction zone 3 are separated by a porous sieve plate 3-4, and a spray head 4-1 is arranged in the spray zone 4. The reactor 1 is connected with a gas making device; the reactor 1 is connected with a gas making device through an air inlet pipe 2-1; the gas making device comprises a device for generating chlorobenzene waste gas and a device for generating oxygen; the device for generating chlorobenzene waste gas sequentially comprises an injection pump 7, a gas generator 8, a mass flow controller 9-1, a gas washing bottle 11-2 and a mass flow controller 9-3 in series; the device for generating oxygen comprises an oxygen pump 10, a gas washing bottle 11-1, a mass flow controller 9-2, a gas washing bottle 11-2 and a mass flow controller 9-3 which are sequentially connected in series; the device for generating chlorobenzene waste gas and the device for generating oxygen are connected with the mass flow controller 9-1 and the mass flow controller 9-2 and then connected with the gas washing bottle 11-2; and a mass flow controller 9-3 in the gas making device is connected with the gas inlet pipe 2-1 through a rubber pipe. The spray header 4-1 is connected with a peristaltic pump 13 through a rubber tube; the peristaltic pump 13 is connected with the nutrient solution storage tank 14 through a rubber tube; the liquid storageThe tank 5-1 is communicated with the gas inlet area 2 through a porous sieve plate 3-5; the peristaltic pump 13 is located outside the reactor 1. The top of the reactor 1 is provided with a gas outlet 6 and a gas monitoring port 14. In particular as shown in figure 1.
Taking activated sludge from a secondary sedimentation tank of a sewage treatment plant, carrying out aeration treatment for 24.0h, adding a nutrient solution, introducing chlorobenzene waste gas, keeping COD (chemical oxygen demand) N: P =100, 1, pH of 7.0, domesticating 15d, and introducing 0g/m to 0-3 d 3 Chlorobenzene, 4-9 days after introduction of 0.1g/m 3 Chlorobenzene is introduced for 10 to 15 days at a flow rate of 0.2g/m 3 Chlorobenzene. The dissolved oxygen was kept at 5.0mg/L. After 15 days of acclimation, the COD removal rate reaches 85.21 percent. Starting at 16d, the chlorobenzene waste gas is added again, and glucose in the nutrient solution is removed to be used as a new nutrient solution to be added into the domestication reaction. The amount of chlorobenzene introduced for 16-21 days is 0.3g/m 3 Introducing 0.4g/m for 22-30 days 3 Chlorobenzene, the color of the bacterial liquid gradually changed from brown to earthy yellow when the culture was carried out for 30 days, the suspended solid concentration (MLSS) of the mixed liquid was 3000mg/L, and the sedimentation ratio (SV 30) was 25%, and at this time acclimatization was successful, and the bacterial liquid was obtained.
The nutrient solution takes water as a solvent and comprises the following components in concentration: 125mg/L glucose, 15mg/L K 2 HPO 4 、7mg/L KCl、4.5mg/L MnSO 4 ·H 2 O、20mg/L NaHCO 3 、7.5mg/L ZnSO 4 ·7H 2 O、2.0mg/L NH 4 Cl、2.5mg/L MgSO 4 、5.0mg/L CoCl 2 ·6H 2 O、2.2mg/L FeSO 4 、3.7mg/L CaCl 2 、2.9mg/L FeCl 3 。
The polysaccharide content in the bacterial liquid is 30mg/gVSS, and the protein content is 46mg/gVSS.
Injecting the successfully domesticated bacterial liquid into a reactor for 24 hours, introducing air with a certain flow into an air inlet pipe to ensure an aerobic environment, and discharging the bacterial liquid after 24 hours to finish inoculation; microbial community structure on three-dimensional particles of post-inoculation reactor: OUTS is 976.00, shannon index is 5.13, degrading bacteria mainly comprise Proteobacteria (Proteobacteria), abundance is 60.42%, rhodococcus (Rhodococcus) is dominant bacteria, and abundance is 60.04%. The holding current density was 0.1A/m 2 Gradually introducing 0 to 0.4g/m 3 Chlorobenzene waste gas, gasThe volume flow rate was controlled at 0.4L/min. The spraying intensity of the nutrient solution is 3.0L/h, the spraying time is 5.0min, and the nutrient solution is sprayed every 4.0 h. The chlorobenzene waste gas removal rate stabilized at 89% from the operation time of 12d to 15d, and at the moment, the biofilm formation start was successful.
The current density is increased to 0.33A/m 2 Spraying the nutrient solution for 10.0min at a spraying intensity of 3.0L/h and every 4.0h, and increasing the addition of chlorobenzene waste gas to 0.5g/m 3 ～2.0g/m 3 The chlorobenzene removal rate is reduced from 90.98% to 88.58%, and the removal capacity is reduced from 12.41g/m 3 h is increased to 42.02g/m 3 h, when the concentration of chlorobenzene is 0.5g/m 3 The energy consumption is 6.57kWh/kg, and the chlorobenzene concentration is 2.0g/m 3 The energy consumption was 17.47kWh/kg.
Example 2
When the protocol of example 2 was set according to the method of example 1, and the three-dimensional electrode biofilm reaction device was set up differently from example 1, the distance between the anode plate and the cathode plate was set to 8cm. The adding amount of chlorobenzene waste gas is increased to 3.0g/m 3 At this time, the chlorobenzene removal rate was 76.52% and the removal capacity was 55.27g/m 3 h, energy consumption 62.51kWh/kg.
Example 3
The three-dimensional electrode biofilm reaction device setup of example 3 was set up according to the method of example 1. The method for preparing a bacterial suspension was different from the method of example 1.
The preparation method of the bacterial liquid in the embodiment 3 comprises the following steps:
mixing Rhodococcus, burkholderia, dokdonella, pandoraea, rhodanobacter, raoultella, sphingomonas, acidovorax with nutrient solution, and culturing for 12h; in this case, the number of viable bacteria of Rhodococcus, burkholderia, dokdonella, pandoraea, rhodanobacter, raoultella, sphingomonas, and Acidovorax in the nutrient solution was 9.0X 10 8 cfu/mL、2.5×10 8 cfu/mL、0.5×10 7 cfu/mL、0.6×10 7 cfu/mL、0.8×10 7 cfu/mL、1.2×10 6 cfu/mL、0.5×10 6 cfu/mL、0.1×10 6 cfu/mL. Adding the nutrient solution into a reactor for biofilm formation according to the method of example 1, and after the biofilm formation succeeds, performing the method of example 1The method increases the adding amount of chlorobenzene waste gas to 2.0g/m 3 At this time, the chlorobenzene removal rate was 89.32%, and the removal capacity was 38.61g/m 3 h, the required energy consumption was 22.06kWh/kg.
As can be seen from the above embodiments, the present invention provides a three-dimensional electrode biofilm reactor and a method for removing chlorobenzene waste gas, and the three-dimensional electrode biofilm reactor of the present invention is a three-dimensional electrode biofilm technology formed by combining an electrochemical technology and a biofilm technology. The three-dimensional particle electrode has the conductive function, improves the unit effective reaction area of the electrolytic cell, obviously improves the mass transfer function, and is especially suitable for hydrophobic organic pollutants. The chlorobenzene waste gas can be effectively removed by utilizing the reaction device.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A three-dimensional electrode biofilm reaction device comprises a reactor (1), and is characterized in that a nutrient solution storage area (5), an air inlet area (2), a reaction area (3) and a nutrient solution spraying area (4) are arranged in the reactor (1) from bottom to top;
a nano aeration head (2-3) is arranged in the air inlet area (2), and the nano aeration head (2-3) is communicated with the air inlet pipe (2-1) through a through-plate thread through (2-2);
a cathode plate (3-1), an anode plate (3-2) and a three-dimensional particle electrode (3-3) are arranged in the reaction area (3);
the gas inlet zone (2) is separated from the reaction zone (3) by a porous sieve plate (3-4);
a spray header (4-1) is arranged in the nutrient solution spray area (4);
the nutrient spraying area (4) is communicated with the reaction area (3);
the nutrient spraying liquid storage area (5) is separated from the air inlet area (2) by a porous sieve plate (3-5).
2. The three-dimensional electrode biofilm reaction device according to claim 1, wherein the reactor (1) is further connected with a gas production device;
the reactor (1) is connected with a gas making device through an air inlet pipe (2-1);
the gas making device comprises a device for generating chlorobenzene waste gas and a device for generating oxygen;
the device for generating chlorobenzene waste gas comprises an injection pump (7), a gas generator (8), a mass flow controller (9-1), a gas washing bottle (11-2) and a mass flow controller (9-3) which are sequentially connected in series;
the device for generating oxygen comprises an oxygen pump (10), a gas washing bottle (11-1), a mass flow controller (9-2), a gas washing bottle (11-2) and a mass flow controller (9-3) which are sequentially connected in series;
the device for generating chlorobenzene waste gas and the device for generating oxygen are connected in parallel to the mass flow controller (9-1) and the mass flow controller (9-2) at the positions respectively connected with the gas washing bottle (11-2).
3. The three-dimensional electrode biofilm reaction device of claim 2, wherein the cathode plate (3-1) is a stainless steel mesh bonded with a viscose-based activated carbon felt;
the specific surface area of the viscose-based activated carbon felt is 1300-1500 m 2 /g；
The anode plate (3-2) is a twill 3K carbon fiber plate bonded with the viscose-based activated carbon felt;
the specific surface area of the viscose-based activated carbon felt is 1300-1500 m 2 /g；
The distance between the cathode plate (3-1) and the anode plate (3-2) is 8-10 cm;
the cathode plate (3-1) and the anode plate (3-2) are respectively connected with the cathode and the anode of the direct current power supply (12) through leads;
the direct current power supply (12) is positioned outside the reactor (1).
4. The three-dimensional electrode biofilm reactor as recited in claim 3, wherein said three-dimensional particle electrode (3-3) is conductive column activated carbon;
the diameter of the conductive column-shaped active carbon is 3.5-4.5 mm;
the specific surface area of the conductive column active carbon is 1000-1200 m 2 /g。
5. The three-dimensional electrode biofilm reaction device according to claim 4, wherein the spray header (4-1) is connected with a peristaltic pump (13) through a rubber tube;
the peristaltic pump (13) is connected with the liquid inlet and outlet (5-2) of the liquid storage tank (5-1) through a rubber tube;
the peristaltic pump (13) is located outside the reactor (1).
6. The three-dimensional electrode biofilm reactor device according to claim 5, wherein the top of the reactor (1) is provided with an air outlet (6) and an air outlet monitoring port (14).
7. The method for removing chlorobenzene waste gas by using the three-dimensional electrode biofilm reaction device as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
and (3) injecting reaction liquid into the reactor, reacting for 20-28 h, discharging the reaction liquid, adding nutrient liquid into the reactor, introducing waste gas, turning on a direct current power supply, and reacting to remove chlorobenzene waste gas.
8. The method according to claim 7, wherein the reaction solution is a bacterial solution;
the dominant phylum contained in the bacterial liquid is proteobacteria, and the dominant genus is Rhodococcus.
9. The method of claim 8, wherein the nutrient solution is water as a solvent, and further comprises the following components in concentrations:
0-250 mg/L glucose, 14-16 mg/L K 2 HPO 4 、6～8mg/L KCl、4～5mg/LMnSO 4 ·H 2 O、18～22mg/L NaHCO 3 、7～8mg/L ZnSO 4 ·7H 2 O、1.5～2.5mg/LNH 4 Cl、2～3mg/L MgSO 4 、4～6mg/L CoCl 2 ·6H 2 O、2～2.4mg/L FeSO 4 、3.5～3.9mg/L CaCl 2 、2.8～3.0mg/L FeCl 3 。
10. The method according to claim 9, wherein the nutrient solution is added to the reactor through a shower head (4-1);
the spraying intensity of the nutrient solution is 2.8-3.2L/h;
spraying the nutrient solution for 1 time every 3.8-4.2 h;
the time for spraying the nutrient solution is 4-10 min each time;
the waste gas is introduced into the reactor through a gas making device through an air inlet pipe (2-1);
the flow rate of the waste gas is 0.35-0.45L/min;
the inlet concentration of the chlorobenzene waste gas is 0 to 3.0g/m 3 ；
The current density of the direct current power supply is 0-0.33A/m 2 。
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