CN111558290A - Low-concentration large-air-volume odor treatment system - Google Patents

Low-concentration large-air-volume odor treatment system Download PDF

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CN111558290A
CN111558290A CN202010445646.6A CN202010445646A CN111558290A CN 111558290 A CN111558290 A CN 111558290A CN 202010445646 A CN202010445646 A CN 202010445646A CN 111558290 A CN111558290 A CN 111558290A
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odor
low
treatment system
gas
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李萌
张永峰
于丽
李晓翠
李光宇
鄞铃
贠小淇
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Beijing Xinlin Water Technology Co ltd
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Beijing Xinlin Water Technology Co ltd
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Abstract

The invention relates to the field of waste gas treatment systems, in particular to a low-concentration large-air-volume odor treatment system. The system includes gas collection system, upper reaches fan, foul smell processing system and low reaches fan, the foul smell processing system includes wet-type reaction section and compound deodorizing device, and compound deodorizing device includes biological treatment section, dry-type filter section, advanced oxidation section. The low-concentration large-air-volume odor treatment system has the advantages of reasonable overall design, compact structure, small occupied area, strong adaptability, stable operation and simple and convenient maintenance.

Description

Low-concentration large-air-volume odor treatment system
Technical Field
The invention relates to the field of waste gas treatment systems, in particular to a low-concentration large-air-volume odor treatment system.
Background
In recent years, global environmental issues have become prominent, and the pollution caused by the emission of industrial waste gas and malodorous gas has become more severe. The malodorous gas mainly comprises inorganic or organic compounds such as hydrogen sulfide, ammonia, organic amine, mercaptan, thioether and the like. The odor components can emit strong odor taste under the condition of low emission concentration, and the gas components not only can cause certain threat to the human health, but also can cause serious influence on the ecology and the surrounding environment; these odor and taste also cause great troubles to human senses such as smell. Therefore, it is imperative to solve the problem of malodour emission.
At present, the odor emission of industrial parks and municipal sewage treatment plants is characterized by large air volume and low odor emission concentration, and the commonly adopted treatment processes comprise biological methods, acid-base absorption, activated carbon absorption, photolysis, plasma and the like, so that the odor is treated and changed into gas harmless to the environment to be emitted. The existing deodorization treatment system has the following problems: 1) in the collection of the sewage treatment plant, a large-scale sewage treatment tank is covered, the number of branch pipelines is large, the air volume and the air pressure are large, the strength requirement of the rear-end equipment on the negative pressure generated by a side fan arranged at the tail end is too high, meanwhile, the front-end gas cannot be completely collected, and the treatment efficiency of the front-end treatment equipment is low; 2) the sewage treatment plant has large gas collection amount, but has low odor concentration, high configuration requirement on treatment equipment and difficult treatment, and the adoption of any single process can cause the design of the equipment shell to be very large, risk on processing, field installation and treatment capacity and can not completely remove the odor; 3) the water discharge system is arranged in the rear-end equipment of the treatment system, and the excessive negative pressure can not form self-flow, so that water carried by the front-end absorption tower can not be discharged in time, accumulated liquid is formed in the equipment, and the treatment efficiency of the equipment is greatly influenced. In order to solve the problems, an efficient odor treatment system with low concentration and small air quantity is imperatively developed.
Disclosure of Invention
The present invention has been made to solve the above problems.
The invention aims to provide a low-concentration atmosphere odor treatment system.
The low-concentration large-air-volume odor treatment system sequentially comprises a gas collection system, an upstream fan, an odor treatment system and a downstream fan according to the gas flow direction, wherein the odor treatment system sequentially comprises a wet reaction section and a composite deodorization device according to the gas flow direction, the composite deodorization device is an integrated device and sequentially comprises a biological treatment section, a dry filtering section and an advanced oxidation section from a gas inlet to an outlet, and the air pressure ratio of the upstream fan to the downstream fan is 1: 1, the two run at the same frequency, and the wind pressure is 2500-.
According to the low-concentration large-air-volume odor treatment system, after the gas collection system carries out sealing treatment on each odor source, the odor sources are respectively collected in a sealing way through the branch pipelines and are conveyed to the odor treatment system through the negative pressure system.
According to the low concentration atmosphere odor treatment system of the embodiment of the invention, the wet reaction section comprises an acid spray tower and an alkaline spray tower in sequence.
According to a specific embodiment of the present invention, the low concentration atmospheric odor treatment system, wherein the biological treatment section comprises a prewash section and a biological filtration section.
According to the specific embodiment of the invention, the low-concentration large-air-volume odor treatment system comprises a gas distribution system and a biological packing layer, wherein the bottom layer of the biological packing layer is ceramsite or honeycomb activated carbon, the middle layer is bark packing, the top layer is volcanic rock or bamboo charcoal and other packing materials, and the packing ratio of the three packing materials is 1: 1: 2.
according to the low-concentration atmosphere odor treatment system of the specific embodiment of the invention, the filtering layers adopted by the dry filtering section are 1-3 layers, and the distance from the advanced oxidation section at the rear end is 10-20 cm.
According to the low-concentration atmosphere odor treatment system of the embodiment of the invention, the bottom end of the dry filtering section is provided with a water outlet, and a water pumping system is arranged on one side of the water outlet.
According to the low-concentration large-air-quantity odor treatment system of the specific embodiment of the invention, the advanced oxidation section comprises a UV photolysis section and a photocatalysis section, an activated carbon layer is added at the rear end of each row of lamp tubes of the photolysis section, and the thickness of the activated carbon fiber layer is 5-15 mm.
According to the low-concentration atmosphere odor treatment system of the specific embodiment of the invention, the composite deodorization equipment is provided with a physical adsorption section at the downstream of the advanced oxidation section, the physical adsorption section is provided with a bypass pipeline, and the front end of the composite deodorization equipment is provided with an electric switching valve which is controlled by an automatic control system.
According to the low-concentration atmosphere odor treatment system of the specific embodiment of the invention, the physical adsorption section adopts activated carbon to perform adsorption treatment on low-concentration odor.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the low-concentration large-air-volume odor treatment system, the double fans on two sides are arranged, the whole system is subjected to partial pressure, odor can be completely collected, the treatment efficiency of each treatment device can be improved, and the situation that the rear-end device deforms and the air suction amount of the front-end device is small due to the integral negative pressure of the rear end is avoided. The setting up of two side fans makes the biological filtration section wind pressure distribute evenly from front to back, and the foul smell gets into the prewashing section and with the circulating water intensive mixing, improves washing efficiency and humidification effect, gets into the filtration section and more evenly distributes the filler pond through the gas distribution structure, avoids reacting inhomogeneous condition, effectively improves biological treatment efficiency.
2. According to the low-concentration large-air-volume odor treatment system, the dry filtering section of the composite deodorization device is provided with the water outlet and the pressurized water pumping system, so that the phenomenon that liquid water intercepted due to overlarge negative pressure in the device cannot flow to the water outlet can be solved.
3. According to the low-concentration large-air-volume odor treatment system, the bypass is arranged at the rear end of the advanced oxidation section of the composite device, the bypass pipeline and the physical adsorption section are switched through automatic control, and the system is selectively used in different working condition periods, so that the use frequency of the adsorption material can be effectively reduced, and the operation cost is reduced.
4. According to the low-concentration large-air-quantity odor treatment system, the wet reaction tower is arranged at the rear end of the upstream fan, on one hand, acid-base absorption is firstly carried out according to odor components of the system, on the other hand, the wet reaction tower integrates partial air supply of the upstream fan and negative pressure air exhaust capacity of the downstream fan, pressure drop average distribution in the tower is guaranteed, odor can be efficiently introduced into the tower, and under the action of the filler, the even distribution of odor can be effectively guaranteed, and the odor can be fully contacted with circulating liquid, so that the odor treatment efficiency is improved. In addition, the problem of serious water carrying caused by the exhaust of the tower top after odor treatment is solved by the balanced distribution of the air pressure, the entrainment amount of water vapor is reduced, and the treatment efficiency and the service life of rear-end equipment are improved.
5. According to the low-concentration large-air-quantity odor treatment system, the extra ozone generated by the photolysis section is effectively consumed by adding the active carbon fiber adsorption layer in the photolysis of the advanced oxidation section, and no additional ozone removal material is needed at the rear end, so that secondary pollution is avoided; the strong adsorbability of the activated carbon fiber and the strong oxidizing property of the ozone are utilized to improve the treatment efficiency of the activated carbon to the odor, and the activated carbon is regenerated, so that the odor treatment efficiency of the whole system is improved.
6. The low-concentration large-air-volume odor treatment system has the advantages of reasonable overall design, compact structure, small occupied area, strong adaptability, stable operation and simple and convenient maintenance.
Drawings
Fig. 1 is a schematic configuration diagram of a low concentration large air exhaust gas treatment system according to an embodiment of the present invention.
Reference numerals: 1-gas collection system, 2-upstream fan, 3-wet acid spray tower, 4-wet alkaline spray tower, 5-biological prewashing section, 6-biological filtering section, 7-dry filter, 8-water outlet, 9-advanced oxidation section, 10-physical adsorption section and 11-downstream fan
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
The low-concentration large-air-volume odor treatment system sequentially comprises a gas collection system, an upstream fan, an odor treatment system and a downstream fan according to the gas flow direction, wherein the odor treatment system sequentially comprises a wet reaction section and a composite deodorization device according to the gas flow direction, and the composite deodorization device is an integrated device and sequentially comprises a biological treatment section, a dry filtering section and an advanced oxidation section from a gas inlet to an outlet.
According to the efficient low-concentration atmosphere odor treatment system provided by the embodiment of the invention, the upstream fan is arranged between the gas collection system and the odor treatment system, so that on one hand, enough negative pressure is provided for the gas collection section to collect all the odorous waste gas, and on the other hand, a certain air supply capacity is formed for the rear-end odor treatment system. The downstream fan is arranged at the rear end of the odor treatment system and provides a negative pressure system to ensure the normal operation of the odor treatment system. The design of the upstream fan and the downstream fan at two sides is beneficial to the pressure distribution of the whole odor treatment system, and avoids the situation that the pressure is concentrated at the rear side, so that the deformation is caused due to the overlarge negative pressure in the rear-end equipment because of insufficient strength, and the gas at the front end cannot be pumped, thereby improving the treatment efficiency of the whole system and ensuring the safety of the system.
The wind pressure and tolerance distribution of upper reaches fan and low reaches fan are adjusted through the frequency conversion and are realized, and the upper reaches fan is responsible for the front end and collects, and low reaches fan is responsible for the pressure drop of rear end treatment facility, and both wind pressures account for than the scope and be 1: 1, both are with the same frequency operation, and the wind pressure is 2500 supple of money 3500Pa, like this, guarantee sewage factory foul smell high efficiency on the one hand and collect, reach the concentration and the tolerance of design, on the other hand guarantees that rear end equipment normally high-efficient operation realizes normal pressure distribution, improves foul smell treatment efficiency, effectively avoids compound deodorization equipment to suppress the pressure phenomenon simultaneously, guarantees that its normal use is not impaired, increase of service life.
According to the high-efficiency low-concentration atmosphere odor treatment system of the embodiment of the invention, the wet reaction section is an acid spray tower and an alkaline spray tower or two stages are used in series, and the wet reaction section is selected according to odor components.
The spray tower comprises a packing layer, a spray layer and a defogging layer, wherein the tower body is made of glass fiber reinforced plastic, heat preservation treatment is carried out on the outside of the tower body according to the application environment, the shell of the heat preservation layer can be made of iron sheet or stainless steel, the heat preservation material is polyurethane or rock wool, and the thickness of the heat preservation layer is 30-80 mm. The acidic spray tower and the alkaline spray tower comprise a tower body, a water tank, a dosing tank, a circulating water pump and a control system, the tower body is provided with an air inlet and an air outlet, the air inlet is connected with a front-end collecting main pipeline, odor enters from the bottom end of the side face of the tower body, and the air outlet is discharged from the top of the tower and is connected with a composite deodorization device.
The wet reaction tower is arranged at the rear end of the upstream fan, on one hand, acid-base absorption is firstly carried out according to odor components of the system, on the other hand, partial air supply of the upstream fan and negative pressure air draft capacity of the downstream fan are integrated in the wet reaction tower, pressure drop average distribution in the tower is guaranteed, the odor can be efficiently introduced into the tower, and under the action of the filler, average distribution of the odor can be effectively guaranteed, the odor is fully contacted with circulating liquid, and therefore odor treatment efficiency is improved. In addition, the problem of serious water carrying caused by the exhaust of the tower top after odor treatment is solved by the balanced distribution of the air pressure, the entrainment amount of water vapor is reduced, and the treatment efficiency and the service life of rear-end equipment are improved.
The wet reaction section firstly passes through a wet acid reaction tower, and generates acid-base neutralization reaction with alkaline gases such as ammonia, dimethylamine, trimethylamine and the like in malodorous gas, and the alkaline gases are converted into soluble salts for treatment, wherein the pH value is 3-6; then the odor gas passes through the acid reaction tower and the alkaline reaction tower after passing through the wet alkaline reaction tower to be neutralized with acid gas such as hydrogen sulfide, methyl mercaptan and the like in the odor gas, the pH value of the circulating liquid is 8-11, the pH value is set according to the odor gas concentration, the odor gas passes through the acid reaction tower and then passes through the alkaline reaction tower, so that the problem that the gas-liquid entrainment generated when the rear end enters the composite deodorization device is acidic to a certain degree, the activity of biological strains in a biological section is influenced, the corrosion and other effects are generated on equipment and internal materials, and the treatment efficiency of the system is reduced.
According to the specific implementation mode of the invention, the composite deodorization equipment is of an integrated box type structure, a glass fiber reinforced plastic shell is adopted, and a gas inlet to an outlet sequentially passes through a biological treatment section, a dry filtering section and a high-grade oxidation section, so that the integrated structure is designed to be convenient for integral installation, the inflection point of a pipeline is saved, the wind pressure of a system is effectively reduced, the effects of water resistance, heat preservation and the like are achieved, and the integral operation, maintenance and control can be realized. The heat insulating material and the stainless steel shell are added outside the shell, and the thickness of the heat insulating layer is 50-100 mm.
According to the high-efficiency low-concentration large-air-volume odor treatment system disclosed by the invention, the biological treatment section comprises a prewashing section and a biological filtering section, the prewashing section is added at the front end of the biological filter, 1-3 layers of washing filler are filled in the prewashing section, so that impurities such as particles brought by front-end gas, salt-containing water vapor carried by the front-end gas and part of soluble odor components are removed, a suitable reaction environment is created for back-end biological filtration, a certain humidity is provided, the prewashing water quantity can be set according to air quantity and recycled, and the prewashing time is generally 2-3 s.
The biological filtering section comprises a gas distribution system and an active filler layer. The gas distribution system is composed of uniformly arranged spray heads, and the gas passes through the active filler layer, is firstly absorbed by the filler and then is oxidized and decomposed by microorganisms attached to the filler. The biological filler layer is composed of 2-4 layers of fillers, different fillers are adopted in sections, and the bottom layer is ceramsite or honeycomb activated carbon, so that the biological filler layer has the characteristics of low density, high porosity and high strength, has a certain supporting function and is small in pressure loss; the middle layer is a bark filler, the specific surface area of the bark is large, the porosity is high, the organic matter content is large, sufficient nutrition is provided for the growth of microorganisms, more microorganism amount is kept, a large amount of the microorganism is easy to harden after long-term use, and the activity is reduced; the top layer is filler such as volcanic rock or bamboo charcoal, and specific surface is big, and the adsorptivity is strong, effectively adsorbs the foul smell that the bottom filler can not in time handle, and the filling proportion of three kinds of fillers is 1: 1: 2. the microorganism culture adopts a specific biological agent, and the residence time of the whole reaction process is 15-25 s.
The arrangement of the bilateral fans of the high-efficiency low-concentration large-air-volume odor treatment system ensures that the wind pressure of the biological filtering section is uniformly distributed from front to back, and the odor enters the prewashing section to be fully mixed with the circulating water, thereby improving the washing efficiency and the humidifying effect; the filter section is filled with the filler pond more uniformly through the gas distribution structure, so that the condition of non-uniform reaction is avoided, and the biological treatment efficiency is effectively improved.
According to the high-efficiency low-concentration large-air-quantity odor treatment system of the embodiment of the invention, the dry filtering section adopts materials with different filtering grades to remove water vapor carried out by the gas of the front-end biological tower. The filtering layer is 1-3 layers, the filtering material can be stainless steel wire mesh or non-woven fabric, etc., the primary effect, the intermediate effect or the high-efficiency material is selected according to the requirement, and the bottom end is provided with a water outlet. The pressure drop is influenced by different used materials and filtering grades, and the pressure drop is smaller by 1-3 layers of filtering materials on the basis of meeting the water removal performance. The filtering section and the rear advanced oxidation section have a certain distance in the range of 10-20cm, so that the gas treated at the front end enters the filtering section to be uniformly distributed and diffused to the effective reaction section of the cavity of the device, a vortex is not formed, and the treatment efficiency of the rear end gas is improved.
The bottom end of the dry type filtering section is provided with a rowThe water gap is used for discharging liquid water, and a downward pressure device is arranged in the buffer channel. A water pumping system can be arranged on one side of the water outlet and specifically comprises a water pumping pipeline, a water pump, a water discharging pipeline and a water discharging valve, wherein the water pump is a pipeline booster pump with a self-absorption function, and the flow control range is 3-10m3The power is 0.75-1.5Kw, the valve is controlled to be opened and closed through an automatic control system, the water pumping time is set, the water pumping time is 20-40min, and the operation is carried out once every 1-2 days. The bottom end of the dry type filtering section is provided with a water outlet, so that the phenomenon that water in the equipment exists for a long time and is brought into circulating liquid by the front end to corrode partial materials is avoided; the phenomenon that liquid water cannot be discharged due to overhigh negative pressure in equipment and stays in the equipment to form water films on materials such as a lamp tube of an advanced oxidation section and the like to generate pollution, so that the treatment efficiency of a system is reduced is avoided; the danger caused by the situation that the advanced oxidation section charged material leaks electricity and the like during long-time operation is avoided.
The high efficiency low concentration atmospheric odor treatment system according to an embodiment of the present invention, wherein said advanced oxidation stage comprises a UV photolysis stage and a photocatalytic stage. The photolysis section adopts a 185 nm-waveband high-energy ultraviolet lamp, an activated carbon layer, specifically an activated carbon fiber module supported by a stainless steel support frame, is added at the rear end of each row of lamp tubes in the photolysis section, has the thickness of 5-15mm, can meet the requirements of space and pressure in equipment, has strong adsorption capacity, and cannot influence the use effect due to too large wind resistance. The photocatalysis section comprises a photocatalysis net and an ultraviolet source, wherein the photocatalysis net comprises a stainless steel supporting frame and a photocatalysis material, the photocatalysis material can take nickel base, honeycomb base, ceramic base, glass fiber felt and the like as carriers to uniformly load nano titanium dioxide photocatalysis active components, the ultraviolet source is a high-energy ultraviolet lamp with a waveband of 254nm, and the reaction residence time at the stage is 1-3 s.
The UV photolysis stage is to irradiate organic waste gas pollutants or malodorous gas by using ultraviolet light of a high-energy ultraviolet lamp with the wavelength of 185nm (bond energy: 647KJ/mol) to destroy chemical bonds of the organic waste gas pollutants or malodorous gas so as to form atoms or groups (C, H, O, and the like) in a free state; meanwhile, oxygen in the mixed air is cracked to form free oxygen to combine to generate ozone, and part of cracked atoms or small molecules react with the ozone to generate water and carbon dioxide.
The photocatalysis stage is that the photocatalysis material is excited to generate electron-hole pairs under the irradiation of ultraviolet light with the wavelength of 254nm, the water adsorbed on the surface of the hole decomposition catalyst generates hydroxyl radicals (OH), and the electrons reduce the oxygen around the hydroxyl radicals into oxygen anions (O)2-) Thereby having strong oxidation-reduction capability and thoroughly degrading various pollutants passing through the surface of the photocatalyst into CO2And H2O。
The high-efficiency low-concentration atmospheric odor treatment system according to the embodiment of the present invention, wherein the advanced oxidation stage decomposes and oxidizes incompletely dissolved components such as methyl mercaptan, dimethyl sulfide, carbon disulfide, etc. in the odor into environmentally harmless gas components.
The combined action of the ozone generated by the UV photolysis section and the activated carbon fiber module is utilized, the adsorption performance of the activated carbon is efficiently utilized, ozone decomposes and oxidizes part of odor molecules adsorbed by the activated carbon, and the decomposed molecules in micropores are continuously taken out, so that the activated carbon is regenerated, the treatment efficiency of the odor and the regeneration of the activated carbon are improved, and the service life is prolonged.
The added active carbon fiber adsorption layer in the high-grade oxidation section for photolysis effectively consumes redundant ozone generated in the photolysis section, and no additional ozone removing material is needed at the rear end, so that secondary pollution is avoided; the strong adsorbability of the activated carbon fiber and the strong oxidizing property of the ozone are utilized to improve the treatment efficiency of the activated carbon to the odor, and the activated carbon is regenerated, so that the odor treatment efficiency of the whole system is improved.
According to the high-efficiency low-concentration large-air-volume odor treatment system of the specific embodiment of the invention, the integrated composite deodorization device can be further provided with a physical adsorption section at the downstream of the advanced oxidation section, the physical adsorption section is provided with a bypass pipeline, the front end of the integrated composite deodorization device is provided with an electric switching valve and is controlled by an automatic control system, small molecule gas which is not completely treated is adsorbed in a certain period of time or when the sudden concentration is high, the gas finally reaches the standard and is discharged, the gas can not be opened under normal working conditions at ordinary times, and the gas treated at the front end enters an exhaust system through the bypass pipeline, so that the replacement frequency of the adsorption material is reduced, and the operation cost.
The physical adsorption section adopts a drawer type drawing structure, a single-layer adsorption layer and 2-6 layers in total, and adopts a high-performance adsorption material which is high-performance activated carbon or molecular sieve. The physical adsorption section adopts high-efficiency adsorption materials to adsorb low-concentration odor, and redundant ozone generated by the front-end advanced oxidation section is used for strengthening adsorption materials such as activated carbon, so that small molecules which are not completely oxidized are further oxidized on the one hand, the adsorption of microporous structures such as the activated carbon to small molecule gas is facilitated, the adsorption efficiency is improved, the service life of the adsorption section is prolonged, the replacement frequency is reduced, and the operation cost is reduced.
The integrated design mode of the composite deodorization device, the material configuration of each process section and the like can take the wind pressure into consideration, and the design of the equipment is optimized to the greatest extent on the basis of meeting the optimal treatment efficiency, so that the wind pressure is reduced to the lowest extent.
Furthermore, each reaction section in the composite deodorization device adopts pipeline bypass connection and is independently used, a certain section is independently used or several sections are used together according to working condition requirements, and related operation is realized through an automatic control system.
According to the embodiment of the invention, the tail end of the high-efficiency low-concentration atmosphere odor treatment system is provided with the exhaust funnel.
As shown in fig. 1, the efficient low-concentration atmospheric odor treatment system of the present invention comprises a gas collection system 1, a wet reaction section, and a composite deodorization device. The gas collecting system firstly carries out sealing treatment on each odor source, then carries out sealing collection through branch pipelines respectively, and conveys the odor source to the odor treatment system through the negative pressure system. The wet reaction section comprises a wet acid spray tower 3 and a wet alkaline spray tower 4. The composite deodorization equipment is an integrated device and sequentially passes through a biological prewashing section 5, a biological filtering section 6, a dry filter 7, an advanced oxidation section 9 and a physical adsorption section 10 from a gas inlet to an outlet.
Wet-type acid spray tower 3 and wet-type alkaline spray tower 4 include tower body, water tank, add medicinal cupping, circulating water pump, control system, the tower body has air intake and air outlet, and the trunk line is collected to the air intake connection front end, and the foul smell gets into from tower body side bottom, and the air outlet is discharged from the top of the tower, is connected with compound deodorizing device.
The biological treatment section comprises a biological prewashing section 5 and a biological filtering section 6, and the biological prewashing section 5 removes impurities brought by front-end gas; the biological filtering section 6 comprises a gas distribution system and an active filler layer, wherein the gas distribution system is composed of uniformly arranged spray heads, gas passes through the active filler layer, is absorbed by the filler, is oxidized and decomposed by microorganisms attached to the filler, the filler is a carbon filler, and the residence time in the whole reaction process is 15-25 s;
the dry filter 7 adopts materials with different filtering levels to remove water vapor brought out by the gas of the front-end biological tower, the filtering layers are 1-3 layers, the filtering materials can be stainless steel wire meshes or non-woven fabrics, and the like, primary effect, intermediate effect or high-efficiency materials are selected according to requirements, and the bottom end is provided with a water outlet 8.
The advanced oxidation section 9 comprises a UV photolysis section and a photocatalysis section, and the photolysis section adopts a high-energy ultraviolet lamp with 185nm waveband; the photocatalysis section comprises a photocatalysis net and an ultraviolet light source, an activated carbon layer, in particular an activated carbon fiber module supported by a stainless steel support frame, is added at the rear end of each row of lamp tubes in the photocatalysis section, has the thickness of 5-15mm, can meet the requirements of space and pressure in equipment, has strong adsorption capacity, and cannot influence the use effect due to overlarge wind resistance. The photocatalysis section comprises a photocatalysis net and an ultraviolet source, wherein the photocatalysis net comprises a stainless steel supporting frame and a photocatalysis material, the photocatalysis material can take nickel base, honeycomb base, ceramic base, glass fiber felt and the like as carriers to uniformly load nano titanium dioxide photocatalysis active components, the ultraviolet source is a high-energy ultraviolet lamp with a waveband of 254nm, and the reaction residence time at the stage is 1-3 s.
The physical adsorption section 10 adopts a drawer type drawing structure, a single-layer adsorption layer with 2-6 layers in total, and adopts a high-performance adsorption material which is high-performance activated carbon or molecular sieve;
the low-concentration large-air-volume waste gas treatment system is used for purifying malodorous waste gas, and odorous gas source odor collected by negative pressure enters a wet acid reaction tower through a gas conveying pipeline to be subjected to primary acid-base neutralization treatment, so that alkaline gases such as ammonia, trimethylamine, dimethylamine and the like in the odor are removed; then the odor enters a wet alkaline reaction tower to carry out secondary acid-base neutralization treatment to remove acidic gases such as hydrogen sulfide, sulfur dioxide, acetic acid and the like in the odor; in the stage, gas-liquid two-phase full contact absorption is carried out mainly according to odor and different spraying liquids, neutralization reaction is carried out, and corresponding acid-base waste gas components are removed; then enters a composite deodorization device and sequentially passes through a biological treatment section, a dry-type filtering section, an advanced oxidation section and a physical adsorption section. The biological treatment section comprises a prewashing section and a biological filtering section, dust-containing components and part of water-soluble components are removed through the prewashing section and enter a next-stage gas distribution system for biological filtering, odor substances are firstly absorbed by the filler and then are oxidized and decomposed by microorganisms attached to the filler, and gas treated by the active biological filler is discharged from the surface of the biological tower in the form of diffused gas flow; then the moisture in the waste gas is removed through the dry filtering section, the influence of the moisture on the subsequent treatment section is reduced, the moisture content in the final exhaust gas is reduced, and the odor treatment efficiency of the subsequent advanced oxidation section is improved; then, the waste gas passes through a high-level oxidation section to carry out oxidation reaction with ozone, oxygen-containing free radicals and the like generated by photolysis and photocatalysis, firstly, the waste gas enters a UV photocatalysis reactor to carry out high-energy decomposition, and a high-energy ultraviolet lamp is adopted to irradiate waste gas molecules so as to break chains and split the waste gas molecules into micromolecular organic matters, carbon dioxide, water and the like; the intermediate product is catalyzed and oxidized by the photocatalytic section, so that the decomposition is more thorough; finally, by a physical adsorption section, residual odor molecules are captured by utilizing the large specific surface area and the internal pore structure of the adsorbent, the strong adsorption capacity and van der Waals force, and methyl mercaptan, dimethyl sulfide, dimethyl disulfide, carbon disulfide, styrene, trimethylamine and the like are mainly removed in the stage. The whole set of odor treatment system adopts an automatic control system, and the treatment efficiency of the odor reaches more than 98 percent.
Example 1
According to the environmental characteristics, whether the reaction tower and the composite deodorization equipment are subjected to heat preservation treatment and damp-proof treatment is selected. The thickness of the heat-insulating layer of the wet-type acidic and alkaline reaction tower is 50mm, two layers of spraying are carried out, one layer of demisting layer is formed, and the dosage and water quantity of the additive agent are controlled by a pH control system; the thickness of the heat-insulating layer of the outer shell of the box body of the composite deodorization equipment is 80mm, and the biological filtering section adopts carbon filler; the dry filter adopts a primary effect layer and a middle effect filtering material layer; five photolysis groups and seven photocatalysis groups are adopted in the advanced oxidation stage, and the photocatalytic material adopts a honeycomb ceramic-based photocatalyst due to overlarge air volume; the odor concentration under this condition is low, so no physical adsorption section is adopted.
The gas amount of the deodorization project for sewage from a certain large municipal sewage treatment plant in Shaanxi is 100000m3The main components of the odor are ammonia gas and hydrogen sulfide, and the efficiency of treating the odor by using the odor treating system with low concentration and large air quantity of the invention is shown in the following table 1.
TABLE 1
Figure BDA0002505773860000091
Figure BDA0002505773860000101
The air flow of the project for deodorizing the sewage from a certain municipal sewage treatment plant in Shandong is 60000m3The main components of the odor are ammonia gas and hydrogen sulfide, the odor is treated by using the low-concentration large-air-volume odor treatment system, and the treatment efficiency of the odor concentration agent is shown in the following table 2.
TABLE 2
Serial number Contaminants Inlet concentration (mg/m)3) Exhaust port concentration (mg/m)3) Purification efficiency (%)
1 NH3 8.27 0.20 97.58
2 H2S 12.80 0.36 97.19
3 Odor gas 6400 (dimensionless) 320 95
The air quantity of the deodorizing project of a garbage screening workshop of a certain garbage disposal plant from Hebei province is 60000m3The main components of the odor are ammonia gas and hydrogen sulfide, the odor is treated by using the low-concentration large-air-volume odor treatment system, and the treatment efficiency of the odor concentration agent is shown in the following table 3.
TABLE 3
Serial number Contaminants Inlet concentration (mg/m3) Vent concentration (mg/m3) Purification efficiency (%)
1 NH3 10.72 0.12 98.89
2 H2S 14.80 0.15 98.99
3 Odor gas 7000 (dimensionless) 300 95.71
The deodorization project of a pretreatment workshop of a kitchen waste treatment plant from Jiangsu is 35000m3The main components of the odor are ammonia gas and hydrogen sulfide, and the odor is treated by using the low-concentration large-air-volume odor treatment system of the invention, and the treatment efficiency of the odor concentration agent is shown in the following table 4.
TABLE 4
Serial number Contaminants Inlet concentration (mg/m3) Vent concentration (mg/m3) Purification efficiency (%)
1 NH3 8.20 0.18 97.8
2 H2S 20.00 0.47 97.65
3 Odor gas 8400 (dimensionless) 420 95
The air quantity of the project for deodorizing industrial sewage in an industrial park from Jiangxi province is 40000m3The main components of the odor are ammonia gas, hydrogen sulfide and low-concentration VOCs, sewage of each plant area is collected to a main collecting pipeline of a sewage treatment plant, the odor is treated by adopting a process flow of a primary wet type acid reaction tower, a primary wet type alkaline reaction tower, a composite deodorization device, an induced draft fan and an exhaust system, and the treatment efficiency of the odor concentration agent is shown in the following table 5.
TABLE 5
Serial number Contaminants Inlet concentration (mg/m3) Vent concentration (mg/m3) Purification efficiency (%)
1 NH3 26.80 0.24 99.10
2 H2S 38.20 0.75 98.04
3 VOCs 47.95 1.25 97.40
4 Odor gas 10000 (dimensionless) 800 92
The air quantity of the project for deodorizing industrial sewage in an industrial park from Hebei province is 15000m3The main components of the odor are ammonia gas, hydrogen sulfide and low-concentration VOCs, sewage of each plant area is collected to a main collecting pipeline of a sewage treatment plant, the odor is treated by adopting a process flow of 'primary wet type acid reaction tower + primary wet type alkaline reaction tower + composite deodorization equipment + induced draft fan + exhaust system', and the treatment efficiency of the odor concentration agent is shown in the following table 6.
TABLE 6
Serial number Contaminants Inlet concentration (mg/m3) Vent concentration (mg/m3) Purification efficiency (%)
1 NH3 18.92 0.25 98.68
2 H2S 32.62 0.58 98.22
3 VOCs 42.20 1.05 97.51
4 Odor gas 9200 (dimensionless) 960 89.57
Example 2
Comparison adopted 30000m3Treatment system of the invention with two fans of per hour, 2500Pa, 37kW and frequency conversion and 30000m adopted3The treatment effect of the single-fan treatment system with frequency conversion of 5000Pa and 75kW is 91.4 percent, the odor treatment efficiency of the double-fan treatment system is good, the system collection effect is good, and the treatment equipment runs stably; the odor treatment efficiency of the high-power single-fan treatment system is only 71.8, the odor cannot be completely collected by negative pressure in the treatment system, the front-end air speed is low, the rear-end air speed is high, the shell of the integrated equipment close to the fan shrinks inwards due to overlarge negative pressure to make a sound, the noise is high, and the outlet noise of the exhaust funnel is high.
Further researching the wind pressure distribution of the double fans of the processing system, the upstream fan and the downstream fan operate at the same frequency, the contribution rate of each fan to the system is the same, the wind pressure is 2500-: 1, if the front and back operating frequency is inconsistent, parameters such as front and back air pressure and air speed of the system are inconsistent, if the upstream fan is lower than the operating frequency of the downstream fan, the parameters of the downstream fan can be forced to operate, so that the operating power of the fan is increased, and the service life and the operating safety of the fan are damaged to a certain extent.
Example 3
The synergistic effect of UV photolysis added activated carbon in terms of treatment effect is mainly reflected in the regeneration and treatment efficiency of ozone on activated carbon, and the effect difference before and after adding activated carbon is shown in table 7 below.
TABLE 7
Figure BDA0002505773860000121
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (9)

1. Low concentration atmosphere foul smell processing system, a serial communication port, low concentration atmosphere foul smell processing system includes gas collection system, upper reaches fan, foul smell processing system and low reaches fan according to the gas flow direction in proper order, wherein, the foul smell processing system includes wet-type reaction section and compound deodorizing device according to the gas flow direction in proper order, compound deodorizing device includes biological treatment section, dry-type filtration section, advanced oxidation section from gas inlet to export in proper order, the wind pressure of upper reaches fan and low reaches fan accounts for than the scope and is 1: 1, the two run at the same frequency, and the wind pressure is 2500-.
2. A low concentration atmospheric air odor treatment system as defined in claim 1 wherein said wet reaction section includes in sequence an acid spray tower and an alkaline spray tower.
3. A low concentration atmospheric odor treatment system as defined in claim 1 wherein said biological treatment stage includes a prewash stage and a biological filtration stage.
4. The low-concentration atmospheric odor treatment system according to claim 3, wherein the biological filtration section comprises a gas distribution system and an active filler layer, the bottom layer of the active filler layer is ceramsite or honeycomb activated carbon, the middle layer is bark filler, the top layer is volcanic rock or bamboo charcoal and other fillers, the filling ratio of the three fillers is 1: 1: 2.
5. a low concentration atmospheric odor treatment system as defined in claim 1 wherein said dry filtering section employs 1-3 layers of filtering layers, spaced 10-20cm from the rear advanced oxidation section.
6. A low concentration atmospheric odor management system as defined in claim 1 wherein said dry filter section is provided at a bottom end thereof with a drain opening and a water pumping system is mounted on a side of the drain opening.
7. A low concentration atmospheric air odor treatment system according to claim 1, wherein said advanced oxidation stage comprises a UV photolysis stage and a photocatalytic stage, an activated carbon layer is added to the rear end of each row of lamp tubes of said photolysis stage, and the thickness of said activated carbon fiber layer is 5-15 mm.
8. The low concentration atmospheric air odor treatment system according to claim 1, wherein a physical adsorption section is provided downstream of said advanced oxidation section, said physical adsorption section being provided with a bypass line, and an electric switching valve is installed at a front end thereof, and said control is performed by an automatic control system.
9. A low concentration atmospheric air odor treatment system as defined in claim 8 wherein said physical adsorption section employs activated carbon to adsorb low concentration odors.
CN202010445646.6A 2020-05-25 2020-05-25 Low-concentration large-air-volume odor treatment system Pending CN111558290A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116173713A (en) * 2023-03-20 2023-05-30 重庆中润新材料股份有限公司 Treatment method for tail gas generated in methylamine and NMP production
CN116294003A (en) * 2023-03-06 2023-06-23 广州市净水有限公司 Underground water purification plant ventilation and deodorization system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116294003A (en) * 2023-03-06 2023-06-23 广州市净水有限公司 Underground water purification plant ventilation and deodorization system
CN116173713A (en) * 2023-03-20 2023-05-30 重庆中润新材料股份有限公司 Treatment method for tail gas generated in methylamine and NMP production

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