CN113101800A - Volatile organic compound treatment reaction system and application thereof - Google Patents
Volatile organic compound treatment reaction system and application thereof Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention relates to a volatile organic compound treatment reaction system and application thereof, wherein the reaction system comprises a biological washing reactor (1), the biological washing reactor (1) comprises activated sludge and reproducible volatile organic compound adsorbent, and the biological washing reactor (1) also comprises: a gas inlet (11) for introducing volatile organic compounds into the biological scrubbing reactor (1); the inlet spraying device (13) is used for pumping out activated sludge and an adsorbent in the biological washing reactor (1) and capturing volatile organic compounds to the lower part of the biological washing reactor (1); an aeration tray (14) for aerating the biological washing reactor (1) and providing oxygen; and a gas outlet (12) for discharging the gas subjected to the aeration treatment. Compared with the prior art, the invention has the advantages of higher capture capacity for water-insoluble substances and the like.
Description
Technical Field
The invention relates to the field of volatile organic compound treatment, in particular to a volatile organic compound treatment reaction system and application thereof.
Background
In many industrial fields, such as plastics, rubber processing, paint production, automotive painting and paint production, the production and processing of industrial products generates a large amount of exhaust gases (VOCs exhaust gases) containing Volatile Organic Compounds (VOCs). The waste gas is discharged into the atmosphere without treatment, and photochemical pollution can be formed under certain conditions, so that the quality of the atmosphere is influenced, and the growth of animals and plants and the health of human beings are influenced. Some toxic VOCs waste gas has the effects of causing disability, teratogenesis and carcinogenesis, and causes serious injury to human bodies exposed for a long time. Therefore, corresponding laws are issued by various countries to limit the emission of the gases, and the air pollution comprehensive emission standard issued and implemented in 1997 in China defines the emission limit of 33 pollutants, including volatile organic compounds such as benzene, toluene, xylene and the like.
There are various treatment techniques available for the treatment of VOCs waste gases. But for waste gas with low VOC concentration and large air volume, the traditional process has the problems of high investment and operation cost, low treatment efficiency, secondary pollution after treatment and the like. Traditional physical adsorbent adsorption processes produce solid waste or require expensive regeneration processes; catalytic combustion, catalytic oxidation and the like require additional energy and the like, which causes waste, secondary pollution and large greenhouse gas emission.
In recent years, as a novel air pollution control technology, a waste gas biological treatment technology which is gradually developed is adopted, the investment and operation cost is reduced in stages compared with the processes of catalytic combustion, catalytic oxidation and the like, secondary pollutants are not generated, fossil energy is not required to be used as dye, the generation of greenhouse gas is lower, and the technology is increasingly widely applied. Conventional techniques for biologically treating VOCs include biological scrubbing, biological trickling filtration, and biological filtration.
VOCs gas enters from the bottom of the tower through the biological trickling filtration method, is contacted with a biological membrane in the flowing process and is purified, and the purified gas is discharged from the top of the tower. And circulating spray liquid enters the filter bed from the upper part of the filler layer, flows through the surface of the biological membrane and then is precipitated at the bottom of the filter tower, N, P, pH regulator and the like are added into supernatant liquid for recycling, and precipitates are discharged out of the system. However, the treatment concentration is low and the treatment gas henry coefficient is small.
The biological filtration purification system consists of a humidifying tower and a biological filtration tower. The volatile organic gas enters a filter tower after being humidified in a humidifying tower, is in contact with a biological filter material inoculated with a biofilm and is degraded to finally generate CO2、H2O and microbial matrix, and the purified gas is discharged from the top. But needs to spray nutrient solution on the top of the tower periodically to provide nutrients for microorganisms on the filter materialThe method has the advantages of low reaction condition, easy control of reaction conditions, easy blockage of a bed layer and large occupied area. The pollutant treatment concentration is low.
The biological washing method is to utilize microbe absorbing liquid comprising microbe, nutrients and water to treat waste gas and is suitable for absorbing soluble gaseous pollutant. The gas-liquid phase contact method in the biological washing method, and the circulating washing liquid in the biological washing method needs to be regenerated by adopting an activated sludge method. However, in general, the circulating washing liquid is mainly water, so that the method is only suitable for VOCs with better water solubility, such as ethanol, ether and other substances with smaller Henry coefficient, and the method is not suitable for VOCs with difficult solubility.
Therefore, the simple biological process still has the defects of low VOCs concentration, great influence of VOCs fluctuation, great influence of water-insoluble gas fluctuation in VOCs, and direct influence of water-insoluble substances on the removal efficiency of VOCs at the ratio of VOCs.
Disclosure of Invention
The present invention aims to overcome the defects of the prior art and provide a volatile organic compound treatment reaction system with high capture and treatment capacity for water-insoluble substances and an application thereof.
The purpose of the invention can be realized by the following technical scheme:
a volatile organic compounds processing reaction system, the reaction system comprising a biological scrubbing reactor, the biological scrubbing reactor comprising therein activated sludge and a regenerable volatile organic compounds sorbent, the biological scrubbing reactor further comprising:
a gas inlet for introducing volatile organic compounds into the biological scrubbing reactor;
the inlet spraying device is used for pumping the activated sludge and the adsorbent in the biological washing reactor and capturing the volatile organic compounds to the lower part of the biological washing reactor; capturing water-soluble organic matters and partial water-insoluble organic matters in a spraying mode, degrading in a biological washing reactor, and biologically regenerating the adsorbent in the biological washing reactor;
an aeration tray for aerating the bio-washing reactor and providing oxygen;
a gas outlet for discharging the gas subjected to the aeration treatment;
the gas inlet is positioned at one side of the biological washing reactor and is connected with the gas inlet pipeline, one end of the inlet spraying device is connected with one side of the biological washing reactor, and the other end of the inlet spraying device is connected with the gas inlet pipeline; the aeration disc is positioned at the bottom of the biological washing reactor.
Further, this reaction system still includes membrane reactor, still is equipped with on this membrane reactor:
the membrane water production spray pipe is used for producing spray water and further absorbing residual volatile organic compounds in the gas subjected to aeration treatment; and also serves to provide corresponding nutrients to the biofilm on the bio-trickling filter carrier.
The membrane reactor is connected with the biological washing reactor, the A end of the membrane water production spray pipe is connected with the membrane reactor, and the B end is positioned at the upper part of the biological washing reactor.
Furthermore, a bio-trickling filter carrier is arranged below the B end of the membrane water production spray pipe and used for growing a biological membrane and helping to degrade volatile organic compounds. On one hand, the spray water further absorbs volatile organic compounds, the volatile organic compounds fall to the bio-trickling filter carrier in the form of aqueous solution and are further degraded, and meanwhile, the spray water provides nutrient substances such as nitrogen, phosphorus and the like required by biological growth for the bio-trickling filter carrier.
Further, the bio-trickling filter carrier comprises a fixed bed biological filler, and a biological film is attached to the filler; the biological filler of the fixed bed comprises one or more of lava particles, porous ceramsite, slag, aerated concrete, activated carbon, alumina, carbon-based materials, humus bark, plant root hairs, twigs, sawdust or peat.
Further, the adsorbent is an inorganic or organic porous substance, and specifically comprises activated carbon, natural zeolite, artificial zeolite, organic pyrolysis products, kaolin or activated alumina;
further, the adsorbent is powder with the granularity of 100-2/g。
Furthermore, the biological washing reactor also comprises washing filler; the washing filler comprises the following materials: ceramic, plastic or metal fillers; the types of fillers include: one or more of Raschig rings, pall rings, cascade ring packing, arc saddle packing, intalox saddle packing, ring intalox saddle packing, spherical packing, conjugate ring packing, Heler ring packing, Natt ring packing, grid packing or corrugated packing. The membrane of the membrane reactor may be an organic membrane or an inorganic membrane.
The application of the above volatile organic compound treatment reaction system for volatile organic compound treatment includes the following steps:
(1) adsorbing and capturing volatile organic compounds: the volatile organic compounds enter a biological washing reactor through a gas inlet pipeline; during the period, the inlet spraying device extracts the activated sludge and the adsorbent in the biological washing reactor and sprays the activated sludge and the adsorbent to the air inlet pipeline to capture volatile organic compounds, particularly non-water-soluble volatile organic compounds, in the biological washing reactor;
in the step, water-soluble volatile organic compounds and part of water-insoluble volatile organic compounds are captured in a spraying mode and degraded in a biological washing reactor, and meanwhile, the adsorbent is biologically regenerated in the biological washing reactor;
(2) biological contact oxidation of volatile organic compounds: starting an aeration disc, aerating the biological washing reactor and providing oxygen, carrying out biological contact oxidation on volatile organic compounds, and discharging the treated gas from a gas outlet after the treated gas passes through a biological trickling filter carrier;
(3) and (3) volatile organic compound reabsorption: introducing the material part in the biological washing reactor into the membrane reactor, performing membrane biological reaction, spraying clean spray water onto the biological trickling filter carrier through a membrane water production spray pipe, and re-absorbing the residual volatile organic compounds in the gas.
The invention relates to a treatment process for volatile organic compounds with medium and low concentration, which improves biological washing (biosscrubber) and biological filtration (Biofilter) and realizes higher treatment efficiency for soluble organic compounds and non-soluble organic compounds.
Further, the concentration of the activated sludge is 200-30000mg/L, preferably 1000-20000 mg/L;
the concentration of the adsorbent is 100-30000mg/L, preferably 300-20000 mg/L;
the spraying water-gas ratio of the inlet spraying device (13) is 0.5-200L/m3Preferably 0.5-100L/m3；
The spraying water-gas ratio of the film water-producing spraying pipe (21) is 0.5-40L/m3Preferably 2 to 20L/m3；
The empty tower residence time on the biological filtration packing layer (15) is 1 to 40s, preferably 5 to 25 s;
the aeration mode comprises micropore aeration, coarse pore aeration or jet aeration, and the oxygen flow of the aeration is 10-600m3H is used as the reference value. I.e. 10-600m3The oxygen flow rate of aeration is different according to the air quantity of inlet air and the concentration of inlet air, and corresponds to each kg of substances per hour.
Further, the volatile organic compounds comprise one or more of toluene, ethanol, ethylenediamine, methanol, formaldehyde, benzene, xylene, ethylbenzene, pentane, 2-methylhexane, carbonyl sulfide, 1-propanol or acetone; the concentration of the volatile organic compounds<2000mg/m3. Theoretically, there are many kinds of degradable organic substances, such as benzene, xylene, ethylbenzene and other VOCs.
Compared with the prior art, the invention has the following advantages:
(1) the invention adopts a physicochemical adsorption mode and a biological regeneration process, improves the capture capacity of organic matters, greatly improves the treatment load of VOCs compared with the traditional biochemical process, has no secondary pollution compared with the traditional combustion, catalysis and other processes, does not need additional energy consumption, and has more than one order of magnitude lower investment and operation cost;
(2) the invention can wash the VOCs with good water solubility into water through spraying organisms, because the adsorbing agent and the activated sludge are used in the spraying, part of VOCs with poor water solubility are captured in the bioreactor by the adsorbing agent and the activated sludge and are absorbed and degraded, and a part of the rest VOCs with poor water solubility are sprayed through the inlet spraying device and are aerated in the bioreactor, are adsorbed by the adsorbing agent and the activated sludge and are degraded in the bioreactor, and the rest VOCs with poor water solubility which are not processed in the bioreactor in time are removed in the biological trickling filter carrier, so all VOCs can be effectively removed;
(3) the adsorbent can effectively capture VOCs with poor water solubility into water, greatly improves the removal efficiency of the VOCs, is in contact with inlet air through spraying and adsorbs and captures the VOCs, is regenerated in biochemical water treatment, improves the use frequency of the adsorbent and improves the use efficiency of the adsorbent.
Drawings
FIG. 1 is a schematic view of a volatile organic compound treatment reaction system used in the examples;
the reference numbers in the figures indicate: the biological washing device comprises a biological washing reactor 1, a gas inlet 11, a gas outlet 12, an inlet spray device 13, an aeration disc 14, a biological trickling filter carrier 15, a membrane reactor 2 and a membrane water production spray pipe 21.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
A volatile organic compound treatment reaction system, as shown in figure 1, comprises a biological washing reactor 1, wherein the biological washing reactor 1 comprises activated sludge and renewable volatile organic compound adsorbent,
the biological scrubbing reactor 1 further comprises: a gas inlet 11 for introducing volatile organic compounds into the biological scrubbing reactor 1; an inlet spraying device 13 for pumping the activated sludge and the adsorbent in the biological washing reactor 1 and capturing the volatile organic compounds to the lower part of the biological washing reactor 1; an aeration tray 14 for aerating the biological washing reactor 1 and supplying oxygen; a gas outlet 12 for discharging the gas subjected to the aeration treatment; the gas inlet 11 is positioned at one side of the biological washing reactor 1 and is connected with the gas inlet pipeline, one end of the inlet spraying device 13 is connected with one side of the biological washing reactor 1, and the other end is connected with the gas inlet pipeline; the aeration tray 14 is located at the lower portion of the biological washing reactor 1 and the gas outlet 12 is located at the top of the biological washing reactor 1.
This reaction system still includes membrane reactor 2, still is equipped with on this membrane reactor 2: the membrane water production spray pipe 21 is used for generating spray water and further absorbing residual volatile organic compounds in the gas subjected to aeration treatment; the membrane reactor 2 is connected with the biological washing reactor 1, the end A of the membrane water production spray pipe 21 is connected with the membrane reactor 2, and the end B is positioned at the upper part of the biological washing reactor 1. A biological trickling filter carrier 15 is arranged below the B end of the membrane water production spray pipe 21 and is used for helping the membrane water production spray pipe 21 to absorb volatile organic compounds. The bio-trickling filter carrier 15 comprises a fixed bed biological filler, and a biological film is attached to the filler; the biological filler of the fixed bed comprises one or more of lava particles, porous ceramsite, slag, aerated concrete, activated carbon, alumina, carbon-based materials, humus barks, plant root hairs, twigs, sawdust or peat.
Wherein the adsorbent is inorganic or organic porous substance, and specifically comprises activated carbon, natural zeolite, artificial zeolite, organic pyrolysis product, kaolin or activated alumina; the adsorbent is 100-3000 mesh powder, and the specific surface area of the adsorbent is 200-1500m2/g。
The volatile organic compound treatment reaction system is applied to the treatment of volatile organic compounds, wherein the volatile organic compounds comprise one or more of methylbenzene, ethanol, ethylenediamine, methanol, formaldehyde, benzene, dimethylbenzene, ethylbenzene, pentane, 2-methylhexane, carbonyl sulfide, 1-propanol or acetone; concentration of volatile organic compounds<2000mg/m3The method specifically comprises the following steps:
(1) adsorbing and capturing volatile organic compounds: the volatile organic compounds enter the biological washing reactor 1 through the gas inlet 11 through the gas inlet pipeline; during the period, the inlet spraying device 13 extracts the activated sludge and the adsorbent in the biological washing reactor 1 and sprays the activated sludge and the adsorbent to the air inlet pipeline to capture volatile organic compounds in the biological washing reactor 1;
(2) biological contact oxidation of volatile organic compounds: starting the aeration disc 14, aerating the biological washing reactor 1 and providing oxygen, carrying out biological contact oxidation on volatile organic compounds, and discharging the treated gas from the gas outlet 12 after passing through the biological trickling filter carrier 15;
(3) and (3) volatile organic compound reabsorption: introducing the material part in the biological washing reactor 1 into the membrane reactor 2, after membrane biological reaction, spraying clean spray water onto the biological trickling filter carrier 15 through a membrane water production spray pipe 21, and re-absorbing the residual volatile organic compounds in the gas.
Wherein the concentration of the activated sludge is 1000-; the concentration of the adsorbent is 300-; the spraying water-gas ratio of the inlet spraying device 13 is 0.5-100L/m3(ii) a The spraying water-gas ratio of the film water-producing spraying pipe 21 is 2-20L/m3(ii) a The empty tower residence time on the bio-trickling filter carrier 15 is 5-25 s; the aeration mode comprises micropore aeration, coarse pore aeration or jet aeration, and the oxygen flow of the aeration is 10-600m3H is about 10 to 600m3Per kg of organic matter.
Example 1
This example deals with a volatile gas mixture containing toluene, ethanol, and acetone. The process is adopted to remove VOCs, wherein ethanol and acetone are VOCs which are easy to dissolve in water, and toluene is organic volatile gas which is not easy to dissolve in water.
The air inlet is sprayed with sludge and adsorbent, no washing filler is filled, and the sludge spraying water-gas ratio of the inlet spraying device 13 is 20L/m3Selecting powdered activated carbon as an adsorbent, wherein the concentration of the activated carbon is 1000 mg/L;
the membrane reactor 2 adopts immersed ultrafiltration, PVDF mesoporous fiber, and the water spraying water-gas ratio of the membrane water production spray pipe 21 is as follows: 4L/m3The biochemical process adopts SBR aeration mode, aerobic aeration and anoxic aeration are alternatively carried out for 8 hours of aerobic aeration and 2 hours of anoxic aeration respectively, and the aeration rate in aerobic aeration is 100m3Per kg of organic matter; the sludge concentration in the biological washing reactor 1 is kept at 4-5 g/L;
asking for, membrane reactor 2 except intercepting mud, the clear water is discharged and is sprayed the biological trickling filter and catch VOCs, also can further degrade the dissolved organic matter in this department, also can degrade partial mud, also need to discharge partial mud when the mud accumulates to a certain extent.
The process combines biological filtration and biological washing, wherein the fixed bed biological filler on the biological trickling filter carrier 15 adopts volcanic rock as the filler, and the empty tower retention time is 25 s;
system in and out treatment effect
Comparative example 1
Compared with the example 1, the inlet air is not sprayed with the sludge and the adsorbent, and only the biotrickling filter is reserved.
System in and out treatment effect
| Organic matter | Intake air concentration mg/m3 | Concentration of discharged gas mg/m3 | Removal rate% |
| Toluene | 128 | 66 | 48.4 |
| Acetone (II) | 332 | 24.1 | 92.7 |
| Ethanol | 312 | 20.3 | 93.5 |
It can be seen that when the biotrickling filter process is used alone, due to the existence of soluble and easily degradable VOCs, organisms tend to treat the easily degradable VOCs more, and the degradation of the VOCs which are relatively difficult to degrade, such as benzene, can be influenced. Therefore, longer residence times or multistage series processes are required to achieve better results; the combination of the biological trickling filter and the biological washing is beneficial to removing insoluble organic matters, so that VOCs which are easy to dissolve in water are treated by the biological washing, VOCs which are not easy to dissolve in water are treated by the biological trickling filter, and the competition of the biological trickling filter on the organic matters is reduced.
The biological washing process is independently used for treating VOCs which are difficult to dissolve in water, and as the VOCs cannot reach water, a good removal rate cannot be obtained; the advantages of the biological trickling filter process and the biological washing process can be combined, so that a better comprehensive removal effect is achieved;
according to the biological washing combined membrane bioreactor, particles are filtered by a membrane process and then are sprayed to a biological trickling filter reactor, so that substances required by biological growth, such as N, P, trace elements and the like, are provided for a biological trickling filter carrier substance; the sprayed water is filtered, so that the pollution and blockage of the carrier filler after long-time operation caused by the introduction of particulate matters are reduced;
the adsorbent is added into the biological reactor of the biological washing process, so that the adsorption of VOCs is increased, and particularly for VOCs with poor solubility, such as toluene, xylene and the like, more VOCs reach the biological washing reactor through spraying, and are biodegraded in the biological washing reactor, and the carrier is regenerated, so that the treatment load of substances is improved.
Example 2
Treating the mixture containing ethylenediamine, methanol, formaldehyde and ABenzene mixed volatile gas, where formaldehyde concentration at the inlet: 31.1mg/m3And the concentration of ethylenediamine: 49.43mg/m3The methanol concentration: 21.17mg/m3The concentration of toluene: 3.58mg/m3. The process is adopted to remove VOCs, wherein ethylenediamine, methanol and formaldehyde are VOCs which are easy to dissolve in water, and toluene is organic volatile gas which is not easy to dissolve in water.
The air inlet is sprayed with sludge and adsorbent, no washing filler is filled, and the sludge spraying water-gas ratio of the inlet spraying device 13 is 20L/m3Selecting powdered activated carbon as an adsorbent, wherein the concentration of the activated carbon is 2000 mg/L;
the membrane reactor 2 adopts immersed ultrafiltration, PVDF mesoporous fiber, and the water spraying water-gas ratio of the membrane water production spray pipe 21 is as follows: 4L/m3The biochemical process adopts SBR aeration mode, aerobic aeration and anoxic aeration are alternatively carried out for 8 hours of aerobic aeration and 2 hours of anoxic aeration respectively, and the aeration rate in aerobic aeration is 100m3Per kg of organic matter; the sludge concentration in the biological washing reactor 1 is kept at 4-5 g/L;
the process combines biological filtration and biological washing, wherein the fixed bed biological filler on the biological trickling filter carrier 15 adopts volcanic rock as the filler, and the empty tower retention time is 5 s;
system in and out treatment effect
| Organic matter | Feed gas concentration ppmv | Outlet gas concentration ppmv |
| Toluene | 3.58 | 0.5 |
| Ethylene diamine | 49.43 | 1.5 |
| Methanol | 21.17 | 0.6 |
| Formaldehyde (I) | 31.1 | 0.5 |
Example 3 biological fermentation waste gas treatment of organic fertilizers
The air inlet is sprayed with sludge and adsorbent, plastic pall ring packing is put into the biological washing reactor 1, and the sludge spraying water-gas ratio of the inlet spraying device 13 is 40L/m3Selecting powdered activated carbon as an adsorbent, wherein the concentration of the adsorbent is 5000mg/L, and placing spherical plastic suspension filler into the biological washing reactor 1;
the membrane bioreactor 2 adopts immersed ultrafiltration, PVDF mesoporous fiber, and the water spraying water-gas ratio of the clear water of the membrane water production spraying pipe 21 is as follows: 2L/m3The biochemical process adopts an aeration mode, aerobic aeration and anoxic alternate aeration are carried out, and the aeration rate is as follows: 120m3Per kg of organic matter; aeration is carried out for 20 hours (aerobic), then the aeration is stopped for 4 hours (anoxic), and the inside of the membrane tank is always aerated; jet aeration mode;
the process combines biological filtration and biological washing, wherein the fixed bed biological filler on the biological filtration filler layer 15 adopts artificial alumina porous material as the filler, and the empty tower residence time is 3 s;
system in and out treatment effect
| Organic matter | Feed gas concentration ppb | Gas outlet concentration ppb | Removal rate% |
| Benzene and its derivatives | 1241 | 284 | 77.1 |
| Toluene | 1212 | 181 | 85.1 |
| Pentane (pentane) | 31454 | 290 | 99.1 |
| 2-methylhexane | 4215 | 53 | 98.7 |
| Carbonyl sulfide | 1575 | 82 | 94.8 |
| Acetone (II) | 19578 | 1144 | 94.2 |
| Ethanol | 471752 | 2190 | 99.5 |
| 1-propanol | 54820 | 337 | 99.4 |
Comparative example 3
The difference from example 3 is that the use of adsorbent was eliminated from the process.
System in and out treatment effect
| Organic matter | Feed gas concentration ppb | Gas outlet concentration ppb | Removal rate% |
| Benzene and its derivatives | 969 | 353 | 63.6 |
| Toluene | 683 | 294 | 57.0 |
| Pentane (pentane) | 16380 | 8274 | 49.5 |
| 2-methylhexane | 2594 | 675 | 74.0 |
| Carbonyl sulfide | 1268 | 108 | 91.5 |
| Acetone (II) | 21582 | 1304 | 94.0 |
| Ethanol | 789505 | 4215 | 99.5 |
| 1-propanol | 12937 | 534 | 95.9 |
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A volatile organic compounds treatment reaction system, characterized in that, the reaction system comprises a biological washing reactor (1), the biological washing reactor (1) comprises active sludge and renewable volatile organic compounds adsorbent, the biological washing reactor (1) also comprises:
a gas inlet (11) for introducing volatile organic compounds into the biological scrubbing reactor (1);
the inlet spraying device (13) is used for pumping out activated sludge and an adsorbent in the biological washing reactor (1) and capturing volatile organic compounds to the lower part of the biological washing reactor (1);
an aeration tray (14) for aerating the biological washing reactor (1) and providing oxygen;
a gas outlet (12) for discharging the gas subjected to the aeration treatment;
the gas inlet (11) is positioned at one side of the biological washing reactor (1) and is connected with the gas inlet pipeline, one end of the inlet spraying device (13) is connected with one side of the biological washing reactor (1), and the other end of the inlet spraying device is connected with the gas inlet pipeline; the aeration disc (14) is positioned at the bottom of the biological washing reactor (1).
2. A voc treatment reaction system according to claim 1 wherein the reaction system further comprises a membrane reactor (2), the membrane reactor (2) further comprising:
the membrane water production spray pipe (21) is used for generating spray water and further absorbing residual volatile organic compounds in the gas subjected to aeration treatment;
the membrane reactor (2) is connected with the biological washing reactor (1), the A end of the membrane water production spray pipe (21) is connected with the membrane reactor (2), and the B end is positioned at the upper part of the biological washing reactor (1).
3. The voc treatment reaction system according to claim 2, wherein a bio-trickling filter carrier (15) is arranged below the B-end of the membrane water-producing shower pipe (21) for growing a biofilm to help degrade voc.
4. A voc treatment reaction system according to claim 3 wherein the bio-trickling filter support (15) comprises a fixed bed of bio-packing material with biofilm attached thereto; the biological filler of the fixed bed comprises one or more of lava particles, porous ceramsite, slag, aerated concrete, activated carbon, alumina, carbon-based materials, humus bark, plant root hairs, twigs, sawdust or peat.
5. The voc treatment reaction system according to claim 1, wherein the adsorbent is an inorganic or organic porous material, and specifically comprises activated carbon, natural zeolite, artificial zeolite, organic pyrolysis products, kaolin, or activated alumina.
6. The VOC processing reaction system as claimed in claim 1 or 5, wherein the adsorbent is in the form of powder of 100-3000 mesh, and the specific surface area of the adsorbent is 200-1500m2/g。
7. A voc treatment reaction system according to claim 1 wherein the biological scrubbing reactor (1) further comprises scrubbing packing; the washing filler comprises the following materials: ceramic, plastic or metal fillers; the types of fillers include: one or more of Raschig rings, pall rings, cascade ring packing, arc saddle packing, intalox saddle packing, ring intalox saddle packing, spherical packing, conjugate ring packing, Heler ring packing, Natt ring packing, grid packing or corrugated packing.
8. Use of a reaction system for volatile organic compounds treatment according to any of claims 1 to 7, for the treatment of volatile organic compounds, comprising the following steps:
(1) adsorbing and capturing volatile organic compounds: volatile organic compounds enter the biological washing reactor (1) through the gas inlet (11) through the gas inlet pipeline; during the period, the inlet spraying device (13) extracts the activated sludge and the adsorbent in the biological washing reactor (1) and sprays the activated sludge and the adsorbent to the air inlet pipeline to capture volatile organic compounds in the biological washing reactor (1);
(2) biological contact oxidation of volatile organic compounds: starting an aeration disc (14), aerating the biological washing reactor (1) and providing oxygen, carrying out biological contact oxidation on volatile organic compounds, and discharging the treated gas from a gas outlet (12) after passing through a biological trickling filter carrier (15);
(3) and (3) volatile organic compound reabsorption: introducing the material part in the biological washing reactor (1) into the membrane reactor (2), after membrane biological reaction, spraying clean spray water onto the biological trickling filter carrier (15) through a membrane water production spray pipe (21), and re-absorbing the residual volatile organic compounds in the gas.
9. The use of the reaction system for treating volatile organic compounds according to claim 8, wherein the concentration of the activated sludge is 200-30000 mg/L;
the concentration of the adsorbent is 100-30000 mg/L;
the spraying water-gas ratio of the inlet spraying device (13) is 0.5-200L/m3；
The spraying water-gas ratio of the film water-producing spraying pipe (21) is 0.5-40L/m3；
The empty tower residence time on the biological filtration filler layer (15) is 1-40 s;
the aeration mode comprises micropore aeration, coarse pore aeration or jet aeration, and the oxygen flow of the aeration is 10-600m3/h。
10. The use of a voc treatment reaction system according to claim 8, wherein the voc comprises toluene, ethanol, ethylenediamine, methanol, formaldehyde, benzene, xylene, ethylbenzene, pentane, 2-methylhexane, carbonyl sulfide, 1-propanol or mixtures thereofOne or more of acetone; the concentration of the volatile organic compounds<2000mg/m3。
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