A volatile organic compound treatment reaction system and its application

Abstract

The present invention relates to a volatile organic compound treatment reaction system and its application. The reaction system includes a biological scrubbing reactor (1), which contains activated sludge and a renewable volatile organic compound adsorbent. The biological scrubbing reactor (1) further includes: a gas inlet (11) for introducing volatile organic compounds into the biological scrubbing reactor (1); an inlet spraying device (13) for extracting the activated sludge and adsorbent in the biological scrubbing reactor (1) to capture the volatile organic compounds at the lower part of the biological scrubbing reactor (1); an aeration disc (14) for aerating the biological scrubbing reactor (1) and providing oxygen; and a gas outlet (12) for discharging the aerated gas. Compared with the prior art, the present invention has the advantages of having a high capture ability for water-insoluble substances, etc.

Description

Technical Field

[0001] The present invention relates to the field of volatile organic compound treatment, and particularly relates to a volatile organic compound treatment reaction system and its application. Background Art

[0002] In many industrial fields such as plastic and rubber processing, paint production, automobile painting, and coating production, a large amount of waste gas containing volatile organic compounds (VOCs) is generated during the production and processing of industrial products. If these waste gases are discharged into the atmosphere without treatment, they will form photochemical pollution under certain conditions, affecting air quality, the growth of animals and plants, and human health. Some toxic VOC waste gases have the effects of causing disability, teratogenesis, and carcinogenesis, causing serious harm to the human body exposed to them for a long time. Therefore, various countries have promulgated corresponding laws to limit the emission of such gases. The "Integrated Emission Standard of Air Pollutants" promulgated and implemented in China in 1997 stipulates the emission limits of 33 pollutants, including volatile organic compounds such as benzene, toluene, and xylene.

[0003] For the treatment of VOC waste gas, there are various treatment technologies available. However, for waste gas with low VOC concentration and large air volume, traditional processes have problems such as high investment and operation costs, low treatment efficiency, and secondary pollution after treatment. The traditional physical adsorption process of adsorbents generates solid waste or requires expensive regeneration processes; catalytic combustion, catalytic oxidation, etc. require additional energy addition, resulting in waste, secondary pollution, and a large amount of greenhouse gas emissions.

[0004] In recent years, the gradually developed waste gas biological treatment technology, as a new type of air pollution control technology, has seen a significant reduction in investment and operating costs compared to processes such as catalytic combustion and catalytic oxidation. Moreover, it has no secondary pollutants, does not require the use of fossil energy as fuel, and produces less greenhouse gas, thus being increasingly widely used. Traditional biological treatment technologies for VOCs include biological scrubbing, biological trickling filtration, and biological filtration.

[0005] In the biological trickling filtration method, VOC gas enters from the bottom of the tower and is purified when it comes into contact with the biofilm during the flowing process. The purified gas is discharged from the top of the tower. The circulating spray liquid enters the filter bed from above the packing layer, flows through the surface of the biofilm, and then precipitates at the bottom of the filter tower. The supernatant is added with N, P, pH regulators, etc. and recycled, and the precipitate is discharged from the system. However, the treatment concentration is low, and the Henry coefficient of the treated gas is small.

[0006] The purification system by biological filtration consists of a humidifying tower and a biological filtration tower. The volatile organic gases are humidified in the humidifying tower and then enter the filtration tower, where they come into contact with the biofilter media that has been inoculated and formed a biofilm, and are degraded. Eventually, CO2, H2O, and microbial matrix are produced, and the purified gas is discharged from the top. However, it is necessary to spray nutrient solution at the top of the tower regularly to provide nutrients, moisture, and maintain a constant pH value for the microorganisms on the filter media. The reaction conditions are not easy to control, the bed is prone to clogging, and it occupies a large area. The pollutant treatment concentration is relatively low.

[0007] Biological scrubbing method uses the microbial absorption liquid composed of microorganisms, nutrients, and water to treat waste gas. It is suitable for absorbing soluble gaseous pollutants. In the biological scrubbing method, the gas-liquid contact method is adopted, and the circulating scrubbing liquid of the biological scrubbing method needs to be regenerated by the activated sludge method. However, under normal circumstances, the circulating scrubbing liquid is mainly water. Therefore, this method is only applicable to VOCs with good water solubility, such as substances with small Henry coefficients like ethanol and ether, while it is not applicable to poorly soluble VOCs.

[0008] It can be seen from this that the simple biological process still has problems such as relatively low treatment concentration of VOCs, being greatly affected by the fluctuations of VOCs, and being greatly affected by the fluctuations of non-water-soluble gases in VOCs. The proportion of non-water-soluble substances in VOCs directly affects the removal efficiency of VOCs. Summary of the Invention

[0009] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a volatile organic compound treatment reaction system and its application with high capture and treatment capabilities for non-water-soluble substances.

[0010] The purpose of the present invention can be achieved through the following technical solutions:

[0011] A volatile organic compound treatment reaction system, which includes a biological scrubbing reactor. The biological scrubbing reactor includes activated sludge and a renewable volatile organic compound adsorbent, and the biological scrubbing reactor also includes:

[0012] A gas inlet for introducing volatile organic compounds into the biological scrubbing reactor;

[0013] An inlet spraying device for extracting the activated sludge and adsorbent in the biological scrubbing reactor, capturing the volatile organic compounds at the lower part of the biological scrubbing reactor; capturing water-soluble organic compounds and part of the non-water-soluble organic compounds by spraying and degrading them in the biological scrubbing reactor, and the adsorbent is biologically regenerated in the biological scrubbing reactor;

[0014] An aeration disk for aerating the biological scrubbing reactor and providing oxygen;

[0015] A gas outlet for discharging the aerated gas;

[0016] The described gas inlet is located on one side of the bioscrubber reactor and is connected to the intake pipeline. One end of the inlet spray device is connected to one side of the bioscrubber reactor, and the other end is connected to the intake pipeline; the aeration disk is located at the bottom of the bioscrubber reactor.

[0017] Furthermore, the reaction system further includes a membrane reactor, and the following are also provided on the membrane reactor:

[0018] A membrane permeate spray pipe, which is used to generate spray water to further absorb the remaining volatile organic compounds in the gas treated by aeration; another function is to provide corresponding nutrients for the biofilm on the biotrickling carrier.

[0019] The described membrane reactor is connected to the bioscrubber reactor. One end (A end) of the membrane permeate spray pipe is connected to the membrane reactor, and the other end (B end) is located above the bioscrubber reactor.

[0020] Furthermore, a biotrickling carrier is provided below the B end of the membrane permeate spray pipe, which is used for growing biofilm to help degrade volatile organic compounds. On the one hand, the spray water further absorbs volatile organic compounds, falls onto the biotrickling carrier in the form of an aqueous solution, and is further degraded. At the same time, it provides nitrogen, phosphorus and other nutrients required for the growth of the biotrickling carrier.

[0021] Furthermore, the biotrickling carrier includes fixed-bed biological packing, and a biofilm is attached to the packing; the fixed-bed biological packing includes one or more of lava particles, porous ceramsite, slag, aerated concrete, activated carbon, alumina, carbon-based materials, humus bark, plant roots, branches, sawdust or peat.

[0022] Furthermore, the adsorbent is an inorganic or organic porous substance, specifically including activated carbon, natural zeolite, synthetic zeolite, organic pyrolysis products, kaolin or activated alumina;

[0023] Furthermore, the adsorbent is in the form of powder with a particle size of 100 - 3000 mesh, and the specific surface area of the adsorbent is 200 - 1500 m 2 / g.

[0024] Furthermore, the bioscrubber reactor further includes washing packing; the material of the washing packing includes: ceramic packing, plastic packing or metal packing; the types of packing include: one or more of Raschig rings, Pall rings, cascade rings, arc saddles, Intalox saddles, ring-intalox saddles, spherical packing, conjugate rings, Hiflow rings, Nutter rings, grid packing or corrugated packing. The membrane of the membrane reactor can be an organic membrane or an inorganic membrane.

[0025] Application of a volatile organic compound treatment reaction system as described above, which is applied to the treatment of volatile organic compounds and specifically includes the following steps:

[0026] (1) Adsorption and capture of volatile organic compounds: Pass the volatile organic compounds through the intake pipe and enter the biological scrubbing reactor through the gas inlet. During this period, the inlet spraying device extracts the activated sludge and adsorbent in the biological scrubbing reactor and sprays them onto the intake pipe to capture the volatile organic compounds, especially water-insoluble volatile organic compounds, in the biological scrubbing reactor;

[0027] In this step, water-soluble volatile organic compounds and some water-insoluble volatile organic compounds are mainly captured by spraying and degraded in the biological scrubbing reactor. At the same time, the adsorbent is biologically regenerated in the biological scrubbing reactor;

[0028] (2) Biological contact oxidation of volatile organic compounds: Start the aeration disk to aerate the biological scrubbing reactor and provide oxygen for biological contact oxidation of the volatile organic compounds. After the treated gas passes through the biological trickling filter carrier, it is discharged from the gas outlet;

[0029] (3) Re-absorption of volatile organic compounds: Part of the material in the biological scrubbing reactor is introduced into the membrane reactor. After membrane biological reaction, the clean spraying water is sprayed onto the biological trickling filter carrier through the membrane-produced water spraying pipe to re-absorb the remaining volatile organic compounds in the gas.

[0030] The present invention is a treatment process for medium and low concentration volatile organic compounds, which improves biological scrubbing (Bioscrubber) and biological filtration (Biofilter) to achieve high treatment efficiency for both soluble and insoluble organic compounds.

[0031] Furthermore, the concentration of the activated sludge is 200 - 30000 mg / L, preferably 1000 - 20000 mg / L;

[0032] The concentration of the adsorbent is 100 - 30000 mg / L, preferably 300 - 20000 mg / L;

[0033] The spraying water-gas ratio of the inlet spraying device (13) is 0.5 - 200 L / m 3 , preferably 0.5 - 100 L / m 3 ;

[0034] The spraying water-gas ratio of the membrane-produced water spraying pipe (21) is 0.5 - 40 L / m 3 , preferably 2 - 20 L / m 3 ;

[0035] The empty tower residence time on the biological filtration packing layer (15) is 1 - 40 s, preferably 5 - 25 s;

[0036] The aeration methods described include microporous aeration, coarse pore aeration or jet aeration, and the oxygen flow rate of aeration is 10 - 600 m 3 / h. That is, 10 - 600 m 3 / kg of organic matter, and the oxygen flow rate of aeration corresponds to per kg of substance per hour according to the gas volume and concentration of the inlet gas.

[0037] Furthermore, the volatile organic compounds include 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 < 2000 mg / m 3 . In theory, there are many types of biodegradable organic matters, such as benzene, xylene, ethylbenzene and other VOCs.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] (1) The present invention adopts a physical and chemical adsorption method and a biological regeneration process, which improves the capture ability of organic matters. Compared with the traditional biochemical process, the treatment load of VOCs is greatly improved. Compared with the traditional processes such as combustion and catalysis, there is no secondary pollution, no additional energy consumption is required, and the investment and operation costs are more than one order of magnitude lower;

[0040] (2) The present invention can wash the VOCs with good water solubility into the water through spray biological washing. Due to the use of adsorbents and activated sludge in the spray, some VOCs with poor water solubility are also captured by the adsorbents and activated sludge and absorbed and degraded in the bioreactor. And a part of the remaining VOCs with poor water solubility are sprayed through the inlet spray device and then aerated in the bioreactor, adsorbed by the adsorbents and activated sludge and degraded in the bioreactor. The remaining part of the VOCs with poor water solubility that are not treated in the bioreactor in time are removed in the biofilter carrier. Therefore, all VOCs can be effectively removed;

[0041] (3) The adsorbent of the present invention can effectively capture VOCs with poor water solubility into the water, greatly improving the removal efficiency of such VOCs. The adsorbent contacts with the inlet gas through spraying and adsorbs and captures VOCs, and is regenerated in the biochemical water treatment, improving the use frequency and efficiency of the adsorbent. Description of the Drawings

[0042] Figure 1 It is a schematic diagram of the volatile organic compound treatment reaction system used in the embodiment;

[0043] As shown in the figure: biological washing reactor 1, gas inlet 11, gas outlet 12, inlet spraying device 13, aeration disk 14, biological trickling filter carrier 15, membrane reactor 2, membrane-produced water spraying pipe 21. Detailed implementation mode

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] A volatile organic compound treatment reaction system, such as Figure 1 , the reaction system includes a biological washing reactor 1, and the biological washing reactor 1 includes activated sludge and a renewable volatile organic compound adsorbent.

[0046] The biological washing reactor 1 further includes: a gas inlet 11 for introducing volatile organic compounds into the biological washing reactor 1; an inlet spraying device 13 for extracting the activated sludge and adsorbent in the biological washing reactor 1 and capturing the volatile organic compounds in the lower part of the biological washing reactor 1; an aeration disk 14 for aerating the biological washing reactor 1 and providing oxygen; a gas outlet 12 for discharging the aerated gas; the gas inlet 11 is located on one side of the biological washing reactor 1 and is connected to an intake pipeline, one end of the inlet spraying device 13 is connected to one side of the biological washing reactor 1, and the other end is connected to the intake pipeline; the aeration disk 14 is located at the lower part of the biological washing reactor 1, and the gas outlet 12 is located at the top of the biological washing reactor 1.

[0047] The reaction system further includes a membrane reactor 2, and the membrane reactor 2 is further provided with: a membrane-produced water spraying pipe 21 for generating spraying water to further absorb the remaining volatile organic compounds in the aerated gas; the membrane reactor 2 is connected to the biological washing reactor 1, the A end of the membrane-produced water spraying pipe 21 is connected to the membrane reactor 2, and the B end is located in the upper part of the biological washing reactor 1. Below the B end of the membrane-produced water spraying pipe 21, there is a biological trickling filter carrier 15 for assisting the membrane-produced water spraying pipe 21 in absorbing volatile organic compounds. The biological trickling filter carrier 15 includes a fixed-bed biological filler, and a biological membrane is attached to the filler; the fixed-bed biological filler includes one or more of lava particles, porous ceramsite, slag, aerated concrete, activated carbon, alumina, carbon-based materials, humus bark, plant roots, branches, sawdust or peat.

[0048] Among them, the adsorbent is an inorganic or organic porous substance, specifically including activated carbon, natural zeolite, artificial zeolite, organic matter pyrolysis products, kaolin or activated alumina; the adsorbent is in powder form with a particle size of 100 - 3000 meshes, and the specific surface area of the adsorbent is 200 - 1500m 2 / g.

[0049] The volatile organic compound treatment reaction system is applied to the treatment of volatile organic compounds, which include one or more of toluene, ethanol, ethylenediamine, methanol, formaldehyde, benzene, xylene, ethylbenzene, pentane, 2-methylhexane, carbonyl sulfide, 1-propanol or acetone; the concentration of volatile organic compounds < 2000mg / m 3 , and specifically includes the following steps:

[0050] (1) Adsorption and capture of volatile organic compounds: Pass the volatile organic compounds through the intake pipe and enter the biological washing reactor 1 through the gas inlet 11; during this period, the inlet spraying device 13 pumps out the activated sludge and adsorbent in the biological washing reactor 1 and sprays them onto the intake pipe to capture the volatile organic compounds into the biological washing reactor 1;

[0051] (2) Biological contact oxidation of volatile organic compounds: Start the aeration disk 14 to aerate the biological washing reactor 1 and provide oxygen for biological contact oxidation of the volatile organic compounds. After the treated gas passes through the biological trickling filter carrier 15, it is discharged from the gas outlet 12;

[0052] (3) Reabsorption of volatile organic compounds: Part of the material in the biological washing reactor 1 is introduced into the membrane reactor 2. After membrane biological reaction, the clean spraying water is sprayed onto the biological trickling filter carrier 15 through the membrane-produced water spraying pipe 21 to reabsorb the remaining volatile organic compounds in the gas.

[0053] Among them, the concentration of activated sludge is 1000 - 20000mg / L; the concentration of adsorbent is 300 - 20000mg / L; the spraying water-gas ratio of the inlet spraying device 13 is 0.5 - 100L / m 3 ; the spraying water-gas ratio of the membrane-produced water spraying pipe 21 is 2 - 20L / m 3 ; the empty tower residence time on the biological trickling filter carrier 15 is 5 - 25s; the aeration methods include microporous aeration, coarse pore aeration or jet aeration, and the oxygen flow rate of aeration is 10 - 600m 3 / h, about 10 - 600m 3 / kg of organic matter.

[0054] Example 1

[0055] This example treats a mixed volatile gas containing toluene, ethanol and acetone. This process is used to remove VOCs. Among them, ethanol and acetone are VOCs that are easily soluble in water, and toluene is an organic volatile gas that is not easily soluble in water.

[0056] At the inlet, sludge and adsorbent spraying are adopted, and no washing packing is filled. The sludge spraying water-gas ratio of the inlet spraying device 13 is 20L / m 3 , and powdered activated carbon is selected as the adsorbent, and the concentration of activated carbon is 1000mg / L;

[0057] The membrane reactor 2 uses submerged ultrafiltration with PVDF hollow fiber membranes. The water-air ratio of the clean water spray from the membrane water production spray pipe 21 is: 4 L / m 3 , and the biochemical process adopts the SBR aeration mode with alternating aerobic and anoxic aeration. The times are 8 hours of aerobic and 2 hours of anoxic respectively. The aeration volume during aerobic is 100 m 3 / kg of organic matter; the sludge concentration in the biological washing reactor 1 is maintained at 4 - 5 g / L;

[0058] Question: In addition to intercepting sludge and discharging clean water for spraying the biotrickling filter and capturing VOCs, will the membrane reactor 2 also further degrade the dissolved organic matter at this location, degrade part of the sludge, and when the sludge accumulates to a certain extent, part of the sludge needs to be discharged?

[0059] This process combines biofiltration and biological washing. Among them, the fixed-bed biological packing on the biotrickling filter carrier 15 uses volcanic rock as the packing, and the empty tower residence time is 25 s;

[0060] Treatment effects of the system inlet and outlet

[0061]

[0062]

[0063] Comparative Example 1

[0064] Compared with Example 1, at the inlet, sludge and adsorbent spraying are not used, and only the biotrickling filter is retained.

[0065] Treatment effects of the system inlet and outlet

[0066] Organic matter <![CDATA[Intake concentration mg / m 3 > <![CDATA[Outlet concentration mg / m 3 > Removal rate % Toluene 128 66 48.4 Acetone 332 24.1 92.7 Ethanol 312 20.3 93.5

[0067] It can be seen that when using the biotrickling filter process alone, due to the presence of soluble and easily degradable VOCs, the biological treatment is more inclined to deal with easily degradable VOCs, which will affect the degradation of relatively difficult-to-degrade VOCs such as benzene. Therefore, a longer residence time or a multi-stage series process is required to achieve better results; the combination of biotrickling filter and biological washing is beneficial to the removal of poorly soluble organic matter, enabling water-soluble VOCs to be treated by biological washing and water-insoluble VOCs to be treated by biotrickling filter, reducing the competition for organic matter on the biotrickling filter carrier.

[0068] When using the biological washing process alone to treat water-insoluble VOCs, since the VOCs cannot reach the water, a good removal rate cannot be obtained; the combination of the biotrickling filter process and the biological washing process can combine the advantages of both to achieve a better comprehensive removal effect;

[0069] The bio-washing combined with the membrane bioreactor of the present invention filters the particles through the membrane process and then sprays them to the bio-trickling filter reactor, providing the bio-trickling filter carrier material with substances required for biological growth such as N, P, and trace elements; since the spraying water is filtered water, the carrier filler is less likely to be blocked by particles after long-term operation;

[0070] Adding adsorbents to the bioreactor of the biological washing process increases the adsorption of VOCs, especially for VOCs with poor solubility, such as toluene and xylene. Through spraying, more VOCs reach the biological washing reactor, and are biodegraded in the biological washing reactor, and the carrier is regenerated, thereby increasing the treatment load of the substance.

[0071] Example 2

[0072] Treating mixed volatile gases containing ethylenediamine, methanol, formaldehyde and toluene, where the formaldehyde concentration at the air inlet is 31.1mg / m 3 , Ethylenediamine concentration: 49.43mg / m 3 , methanol concentration: 21.17mg / m 3 , toluene concentration: 3.58mg / m 3 This process is used to remove VOCs, among which ethylenediamine, methanol and formaldehyde are VOCs that are easily soluble in water, and toluene is an organic volatile gas that is not easily soluble in water.

[0073] The air inlet is sprayed with sludge and adsorbent, and no washing filler is filled. The sludge spray water-gas ratio of the inlet spray device 13 is 20L / m 3 , powdered activated carbon was selected as the adsorbent, and the activated carbon concentration was 2000 mg / L;

[0074] The membrane reactor 2 adopts submerged ultrafiltration, PVDF mesoporous fiber, and the water-gas ratio of the clean water spraying pipe 21 is: 4L / m 3 The biochemical process adopts SBR aeration mode, with aerobic aeration and anoxic aeration alternating for 8 hours of aerobic and 2 hours of anoxic respectively. The aeration volume in aerobic mode is 100m 3 / kg organic matter; the sludge concentration in the biological washing reactor 1 is maintained at 4-5g / L;

[0075] This process combines biological filtration with biological washing, wherein the fixed bed biological filler on the biological trickling filter carrier 15 uses volcanic rock as filler, and the empty tower residence time is 5s;

[0076] System in and out processing effect

[0077] Organic matter Inlet concentration ppmv Outlet concentration ppmv Toluene 3.58 0.5 Ethylenediamine 49.43 1.5 Methanol 21.17 0.6 Formaldehyde 31.1 0.5

[0078] Example 3 - Treatment of waste gas from organic fertilizer biofermentation

[0079] At the air inlet, sludge and adsorbent are sprayed. The biological washing reactor 1 is filled with plastic Pall rings. The sludge spraying water-gas ratio of the inlet spraying device 13 is 40 L / m 3 , powdered activated carbon is selected as the adsorbent, the adsorbent concentration is 5000 mg / L, and the biological washing reactor 1 is filled with spherical plastic suspended packing;

[0080] The membrane bioreactor 2 adopts submerged ultrafiltration, PVDF hollow fiber. The clean water spraying water-gas ratio of the membrane water production spraying pipe 21 is: 2 L / m 3 , the biochemical process adopts an aeration mode, aerobic aeration and anoxic alternating aeration, and the aeration volume is: 120 m 3 / kg of organic matter; the aeration is carried out for 20 hours (aerobic) and then stopped for 4 hours (anoxic). The membrane tank is always aerated; the jet aeration method is adopted;

[0081] This process combines biological filtration and biological washing. Among them, the fixed-bed biological packing on the biological filtration packing layer 15 uses artificial alumina porous material as the packing, and the empty tower residence time is 3 s;

[0082] System inlet and outlet treatment effects

[0083] Organic matter Inlet concentration ppb Outlet concentration ppb Removal rate % Benzene 1241 284 77.1 Toluene 1212 181 85.1 Pentane 31454 290 99.1 2-Methylhexane 4215 53 98.7 Carbonyl sulfide 1575 82 94.8 Acetone 19578 1144 94.2 Ethanol 471752 2190 99.5 1-Propanol 54820 337 99.4

[0084] Comparative Example 3

[0085] The difference from Example 3 is that the use of the adsorbent is removed in the process.

[0086] System inlet and outlet treatment effects

[0087] Organic matter Inlet concentration ppb Outlet concentration ppb Removal rate % Benzene 969 353 63.6 Toluene 683 294 57.0 Pentane 16380 8274 49.5 2-Methylhexane 2594 675 74.0 Carbonyl sulfide 1268 108 91.5 Acetone 21582 1304 94.0 Ethanol 789505 4215 99.5 1-Propanol 12937 534 95.9

[0088] The above are only the preferred embodiments of the present invention, and are not other forms of limitation to the present invention. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A volatile organic compound treatment reaction system, characterized in that, The reaction system includes a biological washing reactor (1), which contains activated sludge and a renewable volatile organic compound adsorbent. The biological washing reactor (1) further includes: A gas inlet (11) for introducing volatile organic compounds into the biological washing reactor (1); An inlet spraying device (13) for pumping out the activated sludge and adsorbent in the biological washing reactor (1) and spraying the volatile organic compounds to the lower part of the biological washing reactor (1); An aeration disk (14) for aerating the biological washing reactor (1) and providing oxygen; A gas outlet (12) for discharging the aerated gas; The gas inlet (11) is located on one side of the biological washing reactor (1) and is connected to the intake pipe. One end of the inlet spraying device (13) is connected to one side of the biological washing reactor (1), and the other end is connected to the intake pipe. The aeration disk (14) is located at the bottom of the biological washing reactor (1); The reaction system further includes a membrane reactor (2), which is also provided with: A membrane-produced water spraying pipe (21) for generating spraying water to further absorb the remaining volatile organic compounds in the aerated gas; The membrane reactor (2) is connected to the biological washing reactor (1). The A end of the membrane-produced water spraying pipe (21) is connected to the membrane reactor (2), and the B end is located above the biological washing reactor (1); The volatile organic compounds include 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 < 2000 mg / m 3 ; Below the B end of the membrane-produced water spraying pipe (21), there is a biological trickling filter carrier (15) for growing a biological film to help degrade volatile organic compounds; The adsorbent is an inorganic or organic porous material.

2. The volatile organic compound treatment reaction system according to claim 1, characterized in that The biological trickling filter carrier (15) includes a fixed-bed biological packing material with a biological film attached thereto. The fixed-bed biological packing material includes one or more of lava particles, porous ceramsite, slag, aerated concrete, activated carbon, alumina, humus bark, plant roots, branches, sawdust or peat.

3. The volatile organic compound treatment reaction system according to claim 1, characterized in that, The adsorbent includes activated carbon, natural zeolite, artificial zeolite, organic matter pyrolysis products, kaolin or activated alumina.

4. The volatile organic compound treatment reaction system according to claim 3, wherein, The adsorbent described is in powder form with a particle size of 100 - 3000 mesh, and the specific surface area of the adsorbent is 200 - 1500 m 2 / g.

5. A volatile organic compound treatment reaction system according to claim 1, characterized in that, The biological washing reactor (1) further includes a washing packing material. The material of the washing packing material includes: ceramic packing material, plastic packing material or metal packing material. The types of packing materials include: one or more of Raschig rings, Pall rings, cascade rings, arc saddles, Intalox saddles, ring-intalox saddles, spherical packing materials, conjugate rings, Hailer rings, Nutter rings, grid packing materials or corrugated packing materials.

6. Use of a volatile organic compound treatment reaction system as described in any one of claims 1-5, characterized in that, This reaction system is applied to the treatment of volatile organic compounds, specifically including the following steps: (1) Adsorption and capture of volatile organic compounds: The volatile organic compounds are introduced into the biological washing reactor (1) through the intake pipe and the gas inlet (11). During this period, the inlet spraying device (13) pumps out the activated sludge and adsorbent in the biological washing reactor (1) and sprays them into the intake pipe to capture the volatile organic compounds in the biological washing reactor (1); (2) Biological contact oxidation of volatile organic compounds: Start the aeration disc (14) to aerate the biological scrubbing reactor (1) and supply oxygen for the biological contact oxidation of volatile organic compounds. After the treated gas passes through the biological trickling filter carrier (15), it is discharged from the gas outlet (12). (3) Reabsorption of volatile organic compounds: Part of the material in the biological scrubbing reactor (1) is introduced into the membrane reactor (2). After membrane biological reaction, the clean spray water is sprayed onto the biological trickling filter carrier (15) through the membrane-produced water spray pipe (21) to reabsorb the remaining volatile organic compounds in the gas.

7. The application of a volatile organic compound treatment reaction system according to claim 6, characterized in that, The concentration of the activated sludge is 200 - 30000 mg / L; The concentration of the adsorbent is 100 - 30000 mg / L; The spray water-gas ratio of the described imported spray device (13) is 0.5 - 200 L / m 3 ; The spray water-gas ratio of the membrane-produced water spray pipe (21) is 0.5 - 40 L / m 3 ; The empty tower residence time on the biological trickling filter carrier (15) is 1 - 40 s; The aeration methods described above include microporous aeration, coarse-pore aeration or jet aeration, and the oxygen flow rate of aeration is 10 - 600 m 3 / h.

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