Biological treatment device for chlorine-containing organic volatile pollutants and its application

Abstract

The present invention discloses a biological treatment device for chlorine-containing organic volatile pollutants and its application. The biological treatment device for chlorine-containing organic volatile pollutants provided by the present invention comprises an air intake pipe 1, a biological treatment box and an exhaust pipe 2. According to the direction of the inflow of chlorine-containing organic volatile pollutants, the biological treatment box is provided with: a biological filter bed 3, a biological filter bed spray system 4, a growth-promoting bacterial community silo 5, and a silo spray system 6 from bottom to top; the growth-promoting bacterial community flows into the biological filter bed 3 below with water, and is used to supplement the growth-promoting bacterial community in the biological filter bed 3. The present invention realizes the biological treatment of chlorine-containing organic pollutants by biological methods by continuously supplementing the growth-promoting bacterial community in the biological filter bed. The treatment device can realize pollution-free, low-cost and high-efficiency treatment of chlorine-containing organic pollutants; the final chlorine-containing product is an inorganic chloride salt, which has a very low impact on the ecology, and the energy consumption of the device is extremely low when in use; it can treat chlorine-containing organic pollutants up to 656ppm.

Description

Technical Field

[0001] The invention relates to the field of waste gas purification, and in particular to a biological treatment device for chlorine-containing organic volatile pollutants and its application. Background Art

[0002] Chlorinated organic pollutants have always been a difficult point in the treatment of chemical pollutants. For example, high-residue pesticides are difficult to degrade in the natural environment for 20 years. The residues in water and soil are very considerable, and they pose a threat to human and animal monitoring through enrichment in the food chain.

[0003] Existing chlorine-containing organic pollutants are currently mainly treated by incineration followed by alkali neutralization. However, incomplete incineration and the large amount of waste generated after treatment that is landfilled still have a harmful impact on the environment. At the same time, the incineration method consumes a large amount of alkali. Although the initial equipment investment is low, the subsequent cost of treating the waste and the consumed alkali is high, and the treatment effect is not satisfactory.

[0004] In the treatment of pollutants, biological methods have the advantages of high initial investment, good results, less pollution, and no other waste. However, since acidic compounds will be produced when chlorinated organic pollutants are treated by biodegradation, which will cause the death of microorganisms, there are no reports on the application of biological methods to treat chlorinated organic pollutants in production. Summary of the invention

[0005] In order to make up for the deficiencies in the above fields, the present invention provides a gas treatment device for chlorine-containing organic pollutants and applications, which can achieve pollution-free, low-cost and high-efficiency treatment of chlorine-containing organic pollutants.

[0006] The present invention adopts the following technical solutions:

[0007] A biological treatment device for chlorinated organic volatile pollutants, comprises an air intake pipe 1, a biological treatment box and an exhaust pipe 2. According to the direction of inflow of chlorinated organic volatile pollutants, the biological treatment box is provided with: a biological filter bed 3, a biological filter bed spraying system 4, a growth-promoting bacteria silo 5, and a silo spraying system 6 from bottom to top; the biological filter bed 3 contains biological filter bed fillers and functional bacteria and growth-promoting bacteria attached to the biological filter bed fillers; the biological filter bed spraying system 4 is arranged above the biological filter bed, and is used to spray water to the biological filter bed 3; the growth-promoting bacteria silo 5 is arranged above the biological filter bed spraying system 4, and the growth-promoting bacteria silo 5 contains silo fillers and growth-promoting bacteria attached to the silo fillers; the silo spraying system 6 is arranged above the growth-promoting bacteria silo 5, and is used to spray water to the growth-promoting bacteria silo 5, and the growth-promoting bacteria flow into the biological filter bed 3 below with the water, and is used to supplement the growth-promoting bacteria in the biological filter bed 3.

[0008] The bottom layer of the growth-promoting bacteria silo layer 5 is a grille, and a mesh is arranged above the grille. The silo filler and the growth-promoting bacteria attached to the silo filler are evenly spread on the mesh.

[0009] The biological treatment device for chlorinated organic volatile pollutants also includes a pretreatment device, which is arranged between the air inlet pipe and the biological treatment box and is used to pretreat the chlorinated organic volatile pollutants flowing into the biological treatment box; the pretreatment device is connected to the bottom fluid of the biological treatment box; a humidifying spray device 7 is arranged on the side wall of the pretreatment device, which is used to adjust the chlorinated organic volatile pollutants to saturated humidity.

[0010] The bottom of the biological treatment tank is provided with a drain port 8 for discharging waste water after pollutant treatment.

[0011] The silo spray system 6 is a staggered spray system with evenly distributed spray heads. The flow rate of the silo spray system 6 is 3m 3 / h~4m 3 / h.

[0012] The silo filler in the growth-promoting bacteria silo layer 5 is made of raw materials of mineral volcanic rock particles, carbon source blocks and pebbles in a volume ratio of 0.8-1.2:0.4-0.6:0.8-1.2; the thickness of the silo filler is 30cm-50cm.

[0013] The types and composition of the growth-promoting bacteria in the growth-promoting bacteria silo layer 5 are bifidobacteria, lactic acid bacteria, actinomycetes and Bacillus subtilis in a mass ratio of 0.8-1.3:0.6-0.8:0.8-1.3:2.5-3.2.

[0014] The filler of the biological filter bed 3 is made of volcanic rock particles, wood blocks and raw shells in a volume ratio of 0.7-1.3:0.7-1.3:0.4-0.6, and the thickness of the filler is 1.5-1.8m.

[0015] The growth-promoting bacteria in the biological filter bed 3 are bifidobacteria, lactic acid bacteria, actinomycetes and Bacillus subtilis in a mass ratio of 0.8-1.3:0.6-0.8:0.8-1.3:2.5-3.2; the functional bacteria in the biological filter bed are Lactobacillus acidophilus, Thiobacillus ferrooxidans, Desulfobacillus, Acidithiobacillus, Pseudomonas sludge, Pseudomonas putida and Microbacterium oxidans in a mass ratio of 2.5-3.2:1.6-1.8:0.9-1.1:0.9-1.1:0.6-0.8:0.6-0.8:0.6-0.8; the mass ratio of the growth-promoting bacteria and the functional bacteria is 1:3.

[0016] The application of the above-mentioned biological treatment device for chlorine-containing volatile organic pollutants in treating chlorine-containing volatile organic pollutants also falls within the protection scope of the present invention.

[0017] Preferably, a temperature control system is provided inside the biological treatment device for chlorine-containing volatile organic pollutants, and the temperature inside the device is controlled at 15°C to 35°C.

[0018] The drain outlet 8 is used to discharge waste water. The chlorine element in the waste water is discharged in the form of chloride salt, which causes minimal pollution to the environment.

[0019] The functional bacteria are bacterial communities that directly react with the chlorine-containing organic pollutants to decompose chlorine-containing organic volatile pollutants; the growth-promoting bacteria are bacterial communities that do not directly participate in the degradation of pollutants but can promote the growth and reproduction of functional bacteria, thereby improving the degradation efficiency of chlorine-containing organic volatile pollutants.

[0020] Chlorine-containing organic pollutants are usually not treated by biological methods because the chlorine element or chlorine-containing compounds formed during the treatment process with ordinary biological filter beds are effective bactericides, which have little effect on the functional bacteria that directly react with chlorine-containing organic pollutants, but have a great impact on the growth-promoting bacteria that stimulate the reaction activity of functional bacteria to organic pollutants, causing a large number of deaths of the growth-promoting bacteria, which is a bottleneck for the biological treatment of chlorine-containing organic pollutants. The present invention realizes the biological treatment of chlorine-containing organic pollutants by continuously adding growth-promoting bacteria to the biological filter bed.

[0021] The biological treatment device for chlorine-containing volatile organic pollutants disclosed in the present invention adds a growth-promoting bacteria silo layer above the biological filter bed, and the growth-promoting bacteria silo layer has a pressure drop of less than 200Pa, or even less than 80Pa; microorganisms are very sensitive to changes in pressure, and one of the methods to put fungi to dormancy is to increase pressure, so the growth-promoting bacteria silo layer is not only a reproduction and storage device for the growth-promoting bacteria, but also when the entire device is in operation, that is, the water sprayed by the upper spray device flows through the growth-promoting bacteria silo layer. It must also have a very low pressure drop of about less than 200Pa to ensure the activity of the bacteria in the biological filter bed below.

[0022] The main reason why the growth-promoting bacteria silo layer has a pressure drop of less than 200Pa, or even less than 80Pa, is the composition of the carrier. The composition of the carrier in the growth-promoting bacteria silo layer disclosed in this article is mineral volcanic rock particles, carbon source blocks and pebbles with a volume ratio of 0.8-1.2:0.4-0.6:0.8-1.2; breeding growth-promoting bacteria in the carrier of this formula can provide a smaller pressure drop, because the volcanic rock has a high porosity and a large specific surface area, which can increase the permeability; its developed pores form an oxygen-deficient environment inside the filter material, making the anaerobic The bacterial community can also maintain strong activity and treat multiple pollutants at the same time; compared with the commonly used filler ceramsite, volcanic rock can also be used as a source of trace elements for biofilms to improve the activity of microorganisms. In a preferred embodiment, the volcanic rock is treated sequentially by acid washing, alkali washing, high temperature and high pressure to activate the internal components of the volcanic rock, improve its strength, and prevent the volcanic rock from being crushed during use; wherein the acid washing can be carried out with a single acid or a compound acid, and the weak acid used for the acid washing is preferably sulfuric acid or nitric acid; the weak base used for the alkali washing is preferably potassium hydroxide or sodium hydroxide. The wood block is a carbon source, which provides a carbon source for the biofilm, preferably a pine wood block, and the wood block is impacted by a high-pressure punch gun to increase the porosity, specific surface area and permeability. The pebbles are selected from high-quality riverbed pebbles with a particle size of 3 to 5 cm. The pebbles are polished by a roller to increase the surface finish and thus increase the permeability. Preferably, the pebbles are riverbed pebbles from the lower reaches of the Yangtze River, the particle size of the volcanic rock particles is 10 to 20 mm, the particle size of the wood blocks is 8 to 16 cm, and the particle size of the pebbles is 3 to 5 cm.

[0023] The growth-promoting bacteria silo layer of the biological treatment device for chlorine-containing volatile organic pollutants of the present invention only contains growth-promoting bacteria that can stimulate functional bacteria to decompose chlorine-containing organic matter, and does not contain functional bacteria. The reason is that if the growth-promoting bacteria silo layer contains functional bacteria, since the growth-promoting bacteria silo layer also contains culture medium and the temperature is suitable, the functional bacteria will multiply, and the metabolic products of the functional bacteria will flow to the biological filter bed below with the water sprayed from the spray system; the applicant found that when functional bacteria are mixed in the growth-promoting bacteria silo layer, their metabolic products are carried to the biological filter bed by water, which will cause the activity of the functional bacteria in the biological filter bed to be inhibited or die. Therefore, the growth-promoting bacteria silo layer only contains growth-promoting bacteria / bacteria.

[0024] Preferably, when the biological treatment device is used to treat chlorine-containing organic volatile pollutants, the chlorine-containing organic volatile pollutants are chlorobenzene, ethylene dichloride, ethyl chloride, vinyl chloride, chloroform and the like.

[0025] In summary, the gas treatment method of chlorine-containing organic volatile pollutants of the present invention has the following advantages compared with the existing treatment methods: (1) It is beneficial to environmental protection. Whether the existing technology uses incineration or other methods, the pollution generated is much greater than that of biological methods. The final chlorine-containing product of the present method is inorganic chloride salt, which has a very low impact on the ecology, and the energy consumption of the biological treatment device during use is extremely low; (2) The device disclosed in the present invention can treat chlorine-containing organic pollutants with a maximum of 656 ppm; (3) The existing technology has not seen the use of biological methods to treat chlorine-containing organic matter, and the present invention has set a precedent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of chlorinated organic volatile pollutants;

[0027] Figure 2 This is a schematic diagram of the water flow direction of chlorinated organic volatile pollutants;

[0028] Figure 3 It is a schematic diagram of the gas flow of chlorine-containing organic volatile pollutants;

[0029] Among them, 1-intake pipe, 2-exhaust pipe, 3-biofilter bed, 4-biofilter bed spray system, 5-growth-promoting bacteria silo, 6-silo spray system, 7-humidification spray device body, 8-drain port, 9-inspection port, 10-pollutant gas intake channel. DETAILED DESCRIPTION

[0030] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or manufacturer recommendations. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased from the market.

[0031] The "bacteria" in this article refers to "bacteria" or "bacterial flora". For example, "growth-promoting bacteria" also refers to "growth-promoting bacterial flora", and "functional bacteria" also refers to "functional bacterial flora".

[0032] Biological materials and sources:

[0033] Bifidobacterium: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC106791;

[0034] Lactic acid bacteria: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC106785;

[0035] Actinomycetes: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC336944;

[0036] Bacillus mucilaginosus: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC335819;

[0037] Lactobacillus acidophilus: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC336974;

[0038] Thiobacillus ferrooxidans: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC169586;

[0039] Desulfobacillus: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC135355;

[0040] Acidithiobacillus: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC206783;

[0041] Pseudomonas sludge: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC167489;

[0042] Pseudomonas putida: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC174678;

[0043] Microbacterium oxydans: purchased from Suzhou Beina Chuanglian Biotechnology Co., Ltd., strain number BNCC137741.

[0044] The above strains are also preserved in this laboratory. The applicant declares that they can be distributed to the public free of charge for necessary verification experiments within 20 years from the date of application. It should be understood that the implementation of the present invention does not depend on the strains represented by the above strain numbers. Bifidobacterium, lactic acid bacteria and actinomycetes can be replaced by one or more other strains of the same genus, and Bacillus mucilaginosus can be replaced by other strains of the same strain. The strains provided here are not used to limit the scope of protection of the present invention.

[0045] Source of consumables:

[0046] Volcanic rock: collected from Tengchong, Yunnan;

[0047] Wood blocks: pine wood collected from Changbai Mountain in Jilin;

[0048] Pebbles: Pebbles produced from the riverbed of the lower reaches of the Yangtze River.

[0049] In the following examples, biochemical reagents not otherwise specified are all conventional reagents in the art, which can be prepared according to conventional methods in the art or purchased commercially, and the specifications are laboratory pure grade; consumables not otherwise specified are all conventional consumables in the art, which can be purchased commercially or commissioned to manufacturers for customization.

[0050] Example 1: Biological treatment device and method for chlorine-containing organic volatile pollutants

[0051] Pollutants to be treated: chlorobenzene volatile organic matter, the intake chlorobenzene concentration is between 200-1000ppm, the normal value is about 500-600ppm, the intake volatile organic matter concentration is between 400-2000ppm, the normal value is about 1000ppm, the flow rate is 20000m 3 / h.

[0052] Depend on Figure 1 As shown, the biological treatment device for chlorinated organic volatile pollutants of this embodiment includes an air inlet pipe 1, a biological treatment box and an exhaust pipe 2. According to the direction of inflow of chlorinated organic volatile pollutants, the biological treatment box is provided with: a biological filter bed 3, a biological filter bed spraying system 4, a growth-promoting bacteria silo 5, and a silo spraying system 6 from bottom to top; the biological filter bed 3 contains biological filter bed fillers and functional bacteria and growth-promoting bacteria attached to the biological filter bed fillers; the biological filter bed spraying system 4 is arranged above the biological filter bed, for spraying water to the biological filter bed 3; the growth-promoting bacteria silo 5 is arranged above the biological filter bed spraying system 4, and the growth-promoting bacteria silo 5 contains silo fillers and growth-promoting bacteria attached to the silo fillers; the silo spraying system 6 is arranged above the growth-promoting bacteria silo 5, for spraying water to the growth-promoting bacteria silo 5, and the growth-promoting bacteria flow into the biological filter bed 3 below with the water, so as to supplement the growth-promoting bacteria in the biological filter bed 3.

[0053] The bottom layer of the growth-promoting bacteria silo layer 5 is a grille, and a mesh is arranged above the grille, on which the silo filler and the growth-promoting bacteria attached to the silo filler are evenly laid. The silo filler in the growth-promoting bacteria silo layer 5 is made of raw materials of mineral volcanic rock particles, carbon source blocks and pebbles with a volume ratio of 0.8:0.4:0.8; the thickness of the silo filler is 30cm. The types and composition of the growth-promoting bacteria in the growth-promoting bacteria silo layer 5 are bifidobacteria, lactic acid bacteria, actinomycetes and mucilaginous bacillus with a mass ratio of 0.8:0.6:0.8:2.5.

[0054] The filler of the biofilter bed 3 is made of volcanic rock particles, wood blocks and raw shells with a volume ratio of 0.7:0.7:0.4, and the thickness of the filler is 1.5m. The growth-promoting bacteria in the biofilter bed 3 are bifidobacteria, lactic acid bacteria, actinomycetes and colloid bacillus with a mass ratio of 0.8:0.6:0.8:2.5; the functional bacteria in the biofilter bed are Lactobacillus acidophilus, Thiobacillus ferrooxidans, Desulfobacillus, Acidophilus Thiobacillus, Pseudomonas sludge, Pseudomonas putida, Microbacterium oxidans with a mass ratio of 2.5:1.6:0.9:0.9:0.6:0.6:0.6; the mass ratio of the growth-promoting bacteria and the functional bacteria is 1:3.

[0055] The biological treatment device for chlorinated organic volatile pollutants also includes a pretreatment device, which is arranged between the air inlet pipe and the biological treatment box and is used to pretreat the chlorinated organic volatile pollutants flowing into the biological treatment box; the pretreatment device is connected to the bottom fluid of the biological treatment box; a humidifying spray device 7 is arranged on the side wall of the pretreatment device, which is used to adjust the chlorinated organic volatile pollutants to saturated humidity.

[0056] A drain port 8 is provided at the bottom of the biological treatment box for discharging wastewater after pollutant treatment. Chlorine in the wastewater is discharged in the form of chloride salt, which causes minimal pollution to the environment.

[0057] The silo spray system 6 is a staggered spray system with evenly distributed spray heads. The flow rate of the silo spray system 6 is 3-4m 3 / h.

[0058] The biological treatment device is provided with a temperature control system inside, and the temperature is controlled at 15° C. to 35° C. The biological treatment device is also provided with three inspection ports 9 on the top for daily maintenance and repair of the internal structure.

[0059] Depend on Figure 2 and 3 As shown, after the pollutant gas enters from the air inlet pipe, it is humidified to saturation in the pretreatment device, and the water-saturated exhaust gas circulates and then enters the biological treatment box through the pollutant gas air inlet channel 10, and passes through the biological filter bed 3 and the growth-promoting bacteria silo 5 in turn. The exhaust gas is then discharged through the exhaust pipe 2. The water flow inside the biological treatment box is from the silo spray system 6 downward to pass through the biological filter bed 3 and be discharged through the drain port 8.

[0060] 1. Prepare the growth-promoting bacterial group silo layer according to the following method:

[0061] 1. Prepare silo filler:

[0062] Treatment of volcanic rocks: acid wash in sulfuric acid solution of pH 4-6 for 3-5 minutes, then wash with clean water and air dry naturally; then alkaline wash in potassium hydroxide solution of pH 8-10 for 3-5 minutes, then wash with clean water and air dry naturally; finally, fumigate the volcanic rocks in high-pressure steam of 5M-10M Pa for 2-3 minutes to remove the salt substances remaining on the surface of the volcanic rocks, and screen the volcanic rock particles with a particle size of 10-20mm.

[0063] Treatment of carbon source blocks: mechanically break the wood blocks, sieve them after breaking, and select wood blocks with a particle size of 8 to 16 cm and a thickness of 3 to 5 cm. Then use a high-pressure impact gun to impact the wood blocks with a water pressure of 350M to 400M Pa for 5 to 10 seconds to increase the structural porosity to 60 to 75%.

[0064] Processing of pebbles: Pebbles are made of high-quality riverbed pebbles with a particle size of 3 to 5 cm. The pebbles are polished with a roller to increase the surface smoothness and thus increase the permeability.

[0065] The processed volcanic rock particles, wood blocks and pebbles are mixed evenly in a volume ratio of 0.8:0.4:0.8, and then loaded into the growth-promoting bacteria silo layer without compaction. The volume of the filler loaded into the growth-promoting bacteria silo layer is determined as follows: The filler volume is Am 3 , the exhaust gas volume is Bm 3 / s(must be m 3 / h to m 3 / s), A / B=C, and must satisfy 4s≤C≤6s, C is the residence time of the gas in the growth-promoting bacteria silo, and the thickness of the growth-promoting bacteria silo is 30cm.

[0066] 2. Biofilm

[0067] (1) Preparation of growth-promoting bacterial flora

[0068] Bifidobacterium, lactic acid bacteria, actinomycetes and Bacillus subtilis were mixed in a mass ratio of 0.8:0.6:0.8:2.5 to obtain a growth-promoting bacterial population.

[0069] The above-mentioned growth-promoting bacterial liquid is used for biofilm formation on the surface of the growth-promoting bacterial silo filler. The steps are as follows: the bacterial liquid is repeatedly circulated by a water pump and evenly sprayed on the silo filler pre-loaded with the growth-promoting bacterial silo layer. After 5 to 7 days of debugging, a uniform active biofilm is attached to the surface of the filler.

[0070] 2. Prepare the biological filter bed as follows:

[0071] 1. Preparation of filler:

[0072] Treatment of volcanic rock: acid wash in sulfuric acid solution of pH 4 for 5 minutes, wash with clean water, and air dry naturally; then alkaline wash in potassium hydroxide solution of pH 10 for 5 minutes, wash with clean water, and air dry naturally; finally, fumigate the volcanic rock in 10 MPa high-pressure steam for 3 minutes to remove the salt substances remaining on the surface of the volcanic rock, and screen the volcanic rock particles with a particle size of 10 to 20 mm, and the porosity is 60%.

[0073] Wood block processing: The wood blocks are mechanically broken (not cut regularly), and then sieved to select wood blocks with a particle size of 8 to 16 cm and a thickness of 3 to 5 cm. Then a high-pressure impact gun is used to impact the wood blocks with a water pressure of 400 MPa for 10 seconds to increase the structural porosity to 75%.

[0074] Processing of raw shells: Wash the raw shells with clean water, break them after drying, sieve them, and select raw shells with a particle size of 5 to 8 cm.

[0075] The processed volcanic rock particles, wood blocks and raw shells are mixed evenly in a volume ratio of 0.7:0.7:0.4 and then loaded into the biofilter bed without compaction. The volume of the filler loaded into the biofilter bed is determined as follows: The volume of the filler is Am 3 , the exhaust gas volume is Bm 3 / s(must be m 3 / h to m 3 / s), A / B=C, which must satisfy 20s≤C≤30s. The thickness of the biofilter bed filler is 1.5m.

[0076] 2. Biofilm

[0077] (1) Preparation of bacterial flora

[0078] Bifidobacterium, lactic acid bacteria, actinomycetes and Bacillus subtilis were mixed in a mass ratio of 0.8:0.6:0.8:2.5 to obtain a growth-promoting bacterial population.

[0079] Lactobacillus acidophilus, Thiobacillus ferrooxidans, Desulfobacillus, Acidithiobacillus, Pseudomonas sludge, Pseudomonas putida, and Microbacterium oxidans were mixed in a mass ratio of 2.5:1.6:0.9:0.9:0.6:0.6:0.6 to obtain a functional bacterial flora.

[0080] The above-mentioned growth-promoting bacteria and functional bacteria liquid are placed on the surface of the biofilter bed filler in a mass ratio of 1:3 for biofilm formation. The steps are as follows: the bacterial liquid is repeatedly circulated by a water pump and evenly sprayed on the filler pre-loaded in the biofilter bed. After 5 to 7 days of debugging, a uniform active biofilm is attached to the surface of the filler.

[0081] The gas treatment method of chlorobenzene volatile organic matter, the waste gas to be treated enters the pretreatment device through the air intake pipe 1, and inside the pretreatment device, the humidification spray device 7 arranged on its inner wall sprays tap water, and the gas is adjusted to saturated humidity and the temperature is adjusted to about 30°C by gas-liquid phase exchange. After passing through the pretreatment device, the waste gas enters from the pollutant gas intake channel 10 at the bottom of the biofilter bed, and passes upward through the biofilter bed. The empty bed time is about 25s. The pollutants are decomposed as energy and nutrients in the metabolic process of the functional bacteria in the biofilter bed, and finally converted into harmless substances. During this period, the growth-promoting bacteria do not directly participate in the degradation of pollutants, but can promote the growth and reproduction of functional bacteria, thereby improving the degradation efficiency of chlorine-containing organic volatile pollutants. The converted chlorine element is transferred to the biofilter bed, which kills the growth-promoting bacteria in the biofilter bed and reduces the treatment effect of the biofilter bed. In order to ensure the continuous and stable treatment effect of the biofilter bed, the silo spray system 6 sprays 3-4m to the growth-promoting bacteria silo layer horizontally arranged below it. 3 / h flow rate of water spray, the water flow carries the growth-promoting bacteria in the growth-promoting bacteria silo layer, replenishes the growth-promoting bacteria to the biofilter bed, and humidifies the biofilm, providing the necessary water for the bacteria to live; at the same time, the biofilter bed spray system 4 also sprays water to the biofilter bed, and the water consumption is 5 tons per day. The purified gas is discharged through the top exhaust pipe, and the wastewater flowing out of the biofilter bed is discharged through the drain port 8.

[0082] The results of organic pollutant treatment are shown in Table 1.

[0083] The detection method is to monitor and analyze the results using online instruments.

[0084] Table 1 Treatment of organic pollutants

[0085]

[0086] It can be seen from the above results that the device can effectively treat chlorobenzene-containing organic pollutants.

[0087] Example 2: Biological treatment device and method for chlorine-containing organic volatile pollutants

[0088] Pollutants to be treated: the same as in Example 1.

[0089] The biological treatment device and treatment method of chlorine-containing organic volatile pollutants in this embodiment are the same as those in Example 1 except for the following parameters:

[0090] The silo filler in the growth-promoting bacteria silo layer 5 is made of raw materials of mineral volcanic rock particles, carbon source blocks and pebbles in a volume ratio of 1.2:0.6:1.2; the thickness of the silo filler is 50 cm. The types and composition of the growth-promoting bacteria in the growth-promoting bacteria silo layer 5 are bifidobacteria, lactic acid bacteria, actinomycetes and mucilaginous bacillus in a mass ratio of 1.3:0.8:1.3:3.2.

[0091] The filler of the biofilter bed 3 is made of volcanic rock particles, wood blocks and raw shells with a volume ratio of 1.3:1.3:0.6, and the thickness of the filler is 1.8m. The growth-promoting bacteria in the biofilter bed 3 are bifidobacteria, lactic acid bacteria, actinomycetes and colloid bacillus with a mass ratio of 1.3:0.8:1.3:3.2; the functional bacteria in the biofilter bed are Lactobacillus acidophilus, Thiobacillus ferrooxidans, Desulfobacillus, Thiobacillus acidophilus, Pseudomonas sludge, Pseudomonas putida, and Microbacterium oxidans with a mass ratio of 3.2:1.8:1.1:1.1:0.8:0.8:0.8.

[0092] The treatment results of chlorobenzene and total volatile organic gases (VOC) were not significantly different from those in Example 1.

[0093] This device can also effectively treat other chlorine-containing organic substances, such as ethylene dichloride, ethyl chloride, vinyl chloride, chloroform, etc.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A biological treatment device for chlorinated organic volatile pollutants, comprising an air intake pipe (1), a biological treatment box and an exhaust pipe (2), Features: According to the direction of inflow of chlorine-containing organic volatile pollutants, the biological treatment box is provided with the following from bottom to top: a biological filter bed (3), a biological filter bed spraying system (4), a growth-promoting bacteria silo (5), and a silo spraying system (6); the biological filter bed (3) contains a biological filter bed filler and functional bacteria and growth-promoting bacteria attached to the biological filter bed filler; the biological filter bed spraying system (4) is arranged above the biological filter bed and is used to spray water to the biological filter bed (3); the growth-promoting bacteria silo (5) is arranged above the biological filter bed spraying system (4), and the growth-promoting bacteria silo (5) contains a silo filler and growth-promoting bacteria attached to the silo filler; the silo spraying system (6) is arranged above the growth-promoting bacteria silo (5) and is used to spray water to the growth-promoting bacteria silo The silo (5) is sprayed with water, and the growth-promoting bacteria flow into the biological filter bed (3) below with the water, so as to supplement the growth-promoting bacteria in the biological filter bed (3). The bottom layer of the growth-promoting bacteria silo (5) is a grille, and a mesh cloth is arranged above the grille. The silo filler and the growth-promoting bacteria attached to the silo filler are evenly laid on the mesh cloth. The biological treatment device for chlorinated organic volatile pollutants also includes a pretreatment device, which is arranged between the air inlet pipe (1) and the biological treatment box, and is used to pretreat the chlorinated organic volatile pollutants flowing into the biological treatment box; the pretreatment device is connected to the bottom fluid of the biological treatment box; and a humidification spray device (7) is arranged on the side wall of the pretreatment device, which is used to adjust the chlorinated organic volatile pollutants to a saturated humidity.

2. The biological treatment device for chlorine-containing volatile organic pollutants according to claim 1, Features: The bottom of the biological treatment tank is provided with a drain port (8) for discharging wastewater after pollutant treatment.

3. The biological treatment device for chlorine-containing volatile organic pollutants according to claim 1, Features: The silo spray system (6) is a staggered spray system with evenly distributed spray heads. The flow rate of the silo spray system (6) is 3m 3 / h~4m 3 / h.

4. The biological treatment device for chlorine-containing volatile organic pollutants according to claim 1, Features: The silo filler in the growth-promoting bacteria silo (5) is made of raw materials of mineral volcanic rock particles, carbon source blocks and pebbles in a volume ratio of 0.8-1.2:0.4-0.6:0.8-1.2; the thickness of the silo filler is 30 cm to 50 cm.

5. The biological treatment device for chlorine-containing volatile organic pollutants according to claim 1, Features: The types and composition of the growth-promoting bacteria in the growth-promoting bacteria silo (5) are bifidobacteria, lactic acid bacteria, actinomycetes and Bacillus subtilis in a mass ratio of 0.8-1.3:0.6-0.8:0.8-1.3:2.5-3.

2.

6. The biological treatment device for chlorine-containing volatile organic pollutants according to claim 1, Features: The filler of the biological filter bed (3) is made of volcanic rock particles, wood blocks and raw shells in a volume ratio of 0.7-1.3:0.7-1.3:0.4-0.6, and the thickness of the filler is 1.5-1.8m.

7. The biological treatment device for chlorine-containing volatile organic pollutants according to claim 1, Features: The growth-promoting bacteria in the biological filter bed (3) are bifidobacteria, lactic acid bacteria, actinomycetes and mucilaginous bacillus in a mass ratio of 0.8-1.3:0.6-0.8:0.8-1.3:2.5-3.2; the functional bacteria in the biological filter bed are Lactobacillus acidophilus, Thiobacillus ferrooxidans, Desulfobacillus, Acidithiobacillus, Pseudomonas sludge, Pseudomonas putida and Microbacterium oxidans in a mass ratio of 2.5-3.2:1.6-1.8:0.9-1.1:0.9-1.1:0.6-0.8:0.6-0.8:0.6-0.8; the mass ratio of the growth-promoting bacteria to the functional bacteria is 1:

3.

8. Use of the biological treatment device for chlorinated organic volatile pollutants according to any one of claims 1 to 7 in treating chlorinated organic volatile pollutants.

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