CN113144850A

CN113144850A - Efficient oxidation and biological filtration multiplication deodorization system and process thereof

Info

Publication number: CN113144850A
Application number: CN202110036159.9A
Authority: CN
Inventors: 朱核光; 赵宁华; 魏宏斌; 曾敏福; 刘钰; 邹平; 刘霞
Original assignee: SHANGHAI ZHONGYAO ENVIRONMENTAL PROTECTION INDUSTRIAL CO LTD
Current assignee: SHANGHAI ZHONGYAO ENVIRONMENTAL PROTECTION INDUSTRIAL CO LTD
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-07-23

Abstract

The invention provides a high-efficiency oxidation and biological filtration multiplication deodorization system, which comprises at least one box body, wherein a trickling filter and a filter tank are sequentially arranged in the box body along the advancing direction of waste gas; an exhaust gas inflow area, a trickling filter bed and a water distribution area are sequentially arranged in the trickling filter along the exhaust gas advancing direction, and a circulating liquid storage tank is arranged below the exhaust gas inflow area; and an irrigation area, a filtering bed and a gas gallery are sequentially arranged in the filtering tank along the advancing direction of the waste gas. The invention further provides a high-efficiency oxidation and biological filtration multiplication deodorization process. The efficient oxidation and biological filtration multiplication deodorization system and the process thereof are used for deodorization and VOC control in the field of environmental engineering waste gas treatment, and can treat waste gas with higher concentration and more complex components by combining two biological reaction modes of biological trickling filtration and biological filtration, and obtain better waste gas treatment effect.

Description

Efficient oxidation and biological filtration multiplication deodorization system and process thereof

Technical Field

The invention belongs to the technical field of environmental engineering, and relates to a high-efficiency oxidation and biological filtration multiplication deodorization system and a process thereof.

Background

Deodorization and control of Volatile Organic Compounds (VOC) are important aspects of the exhaust gas treatment field. Sewage plants and sludge treatment centers, municipal waste transfer stations and treatment centers, production devices and production workshops of garbage (containing hazardous waste) landfill sites, industrial and mining enterprises (containing food plants, slaughterhouses, spraying and printing enterprises, chemical enterprises and the like), colony houses of agricultural breeding industry and the like can generate stink and VOC substances, and gas collection and centralized treatment are needed to be carried out to carry out waste gas deodorization and VOC control. The methods of waste gas deodorization and VOC control can adopt washing, adsorption, ultraviolet ray/plasma, regenerative combustion/catalytic combustion, biological filtration and the like, wherein the biological filtration method becomes a mainstream process due to low operation cost and stable treatment effect.

Biological processes (sometimes also referred to collectively as biofiltration processes) are classified into two types, bioleaching and biofiltration, according to the mass transfer mode of gas and the existence mode of organisms. The biological trickling filter has a larger circulating liquid flow filter material surface, organisms exist in a fixation mode and a suspension mode, and the circulating liquid is added with nutrition required by the growth of the microorganisms; pollutants in the gas are firstly transferred into water and then transferred to the surfaces of microorganisms, and the microorganisms utilize the pollutants in the water and decompose and convert the pollutants into harmless and odorless substances; the effective residence time of the bio-trickling filter generally only needs a few seconds; the objects treated by the method are mainly organic and inorganic components which are easily dissolved in water. The biological filtering pond has no flowing liquid on the surface of the filtering material, and the organism exists in a fixed state to form one layer of mucous membrane on the surface of the filtering material, so that the pollutant component in the gas is directly transferred to the mucous membrane layer and adsorbed to the solid surface of the filtering material and the organism, decomposed and utilized and converted into odorless and harmless matter. In conventional biological deodorization or VOC control systems, bio-trickling and bio-filtration are often used separately or separately. When using the biological filtration alone, it is often necessary to provide a humidification device before the biological filtration to ensure sufficient humidity of the gas entering the biological filtration tank, or to provide an irrigation system in the biological filtration tank to ensure the humidification of the filter bed and the suitable growth environment for the microorganisms.

The quality of the treatment effect of the biological trickling filter is influenced by factors such as air flow rate, empty tower retention time, circulating liquid flow, filter material types, nutrient solution addition and the like. The volume of the biotrickling filter is generally small, and the effective retention time is 2-8 seconds. Too high a residence time will result in too large a trickling filter volume, increased circulating liquid flow and reduced treatment efficiency.

The treatment effect of the biological filter tank is related to factors such as air flow rate, empty tower retention time, irrigation water quantity and frequency, filter material types, water content of a filter bed, air humidity and the like. The effective residence time of the biological filter is generally 20-40 seconds. Too short residence time often causes too small filter volume, too large air speed, difficult maintenance of filter moisture content and poor treatment effect. If the retention time is too long, the volume of the filter tank is too large, the using amount of filter materials and the volume of the filter tank are increased, and the construction cost is increased. In addition, the relative humidity of the air has a large effect on the maintenance of the moisture content of the filter bed. The traditional biological filter materials comprise bark, straw, compost, gravel, volcanic rock, ceramsite, bamboo charcoal, granular activated carbon and the like, and different filter materials have different properties such as price, hygroscopicity, structural strength and stability, surface adsorption capacity, nutrient content without promoting the growth of microorganisms and the like, so that the filter materials have different cost performance and use efficiency. Maintaining the proper moisture content of the filter material layer is the most critical to maintaining the optimal operation state, and the moisture content of the filter chamber generally needs to be more than 20 percent, and the optimal moisture content is 45 to 70 percent. The best way to maintain the moisture content in the optimum range is to maintain the relative humidity in the air above 90% and the superficial velocity in the lower range (below 0.05 m/h). When the relative humidity is below 90%, even if the empty tower flow rate is in the optimal range, the filter bed can be dried within a few days, so that the biological activity is greatly reduced, and the removal effect is seriously influenced.

In summary, when the biological trickling filtration system is used for air purification, the retention time is short, and the water-insoluble components in the exhaust gas cannot be effectively transferred to water and completely removed, so the removal efficiency of the biological trickling filtration method for the gas components which are slightly soluble or insoluble in water, such as toluene, xylene, chloroform (chloroform), and the like, cannot achieve the ideal effect.

The biofiltration system can remove water soluble and water insoluble components, but the removal effect depends on the operating conditions such as the relative humidity of the air entering the biofiltration device and the moisture content of the filter bed. If the relative humidity of air and the moisture content of the filter material layer are too low, the biological activity is greatly reduced, and the removal effect is seriously deteriorated. In addition, if the concentration of the VOC components contained in the exhaust gas is too high, microorganisms in the biofilter bed grow too fast, resulting in clogging of the filter bed and an increase in the flow resistance of the filter bed. The traditional biological filter materials comprise barks, straws, composts, gravels, volcanic rocks, ceramsite, bamboo charcoal, granular activated carbon and the like, wherein the organic filter materials of the barks, the straws, the composts and the like have good hygroscopicity, can provide nutrients required by the growth of microorganisms, are beneficial to the attachment growth of the microorganisms, are easy to corrode and deteriorate and have short service life; although sludge particle filter materials such as volcanic rocks, ceramsite and the like also have the characteristics of good moisture absorption, stable shape, long service life and the like, the surface adsorption capacity is poor, microorganisms are difficult to adhere and grow, and nutrients required by growth cannot be provided for the microorganisms; inorganic filter materials such as bamboo charcoal and granular activated carbon have good surface adsorption capacity, but cannot provide required nutrient components for microorganisms for a long time, and are not beneficial to the attachment and growth of the microorganisms.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a deodorization system and a process thereof, which are efficient and stable, can be used for exhaust gas purification in the field of environmental engineering, especially exhaust gas deodorization and VOC emission control, can realize efficient oxidation and biological filtration multiplication, can treat and purify different exhaust gases with wider concentration range, and provide better treatment effect.

In order to achieve the above objects and other related objects, a first aspect of the present invention is directed to provide a highly efficient oxidation and biological filtration enhanced deodorization system, comprising at least one tank body, wherein a trickling filter and a filter tank are sequentially disposed in the tank body along an exhaust gas traveling direction; an exhaust gas inflow area, a trickling filter bed and a water distribution area are sequentially arranged in the trickling filter along the exhaust gas advancing direction, and a circulating liquid storage tank is arranged below the exhaust gas inflow area; and an irrigation area, a filtering bed and a gas gallery are sequentially arranged in the filtering tank along the advancing direction of the waste gas.

Preferably, a partition wall is arranged between the trickling filter and the filter tank, a communicating port is arranged on the partition wall, the trickling filter and the filter tank are communicated through the communicating port, and a water collector is arranged on the communicating port.

More preferably, the water collector comprises a baffle, a guide rail and a traction piece, wherein the traction piece is connected with the baffle, and the traction piece pulls the baffle to slide on the guide rail.

Preferably, the exhaust gas inflow region is provided with a gas inlet.

Preferably, a water distribution mechanism is arranged in the water distribution area, the water distribution mechanism comprises a water distribution pipe and a plurality of spray headers arranged at one end of the water distribution pipe, the water distribution pipe penetrates through the box body, and the other end of the water distribution pipe is communicated with the circulating liquid storage tank.

More preferably, a circulating pump is arranged on the water distribution pipe.

More preferably, the water distributor is externally connected with a nutrient solution input pipe and a trickling filtration waste liquid discharge pipe.

Preferably, a first water replenishing pipe is connected outside the circulating liquid storage tank, and a first water replenishing control valve is arranged on the first water replenishing pipe.

Preferably, be equipped with irrigation mechanism in the irrigation district, irrigation mechanism is including irrigation pipe and locate a plurality of nozzles on irrigation pipe.

More preferably, a second water replenishing pipe is connected outside the irrigation pipe, and a second water replenishing control valve is arranged on the second water replenishing pipe.

Preferably, a moisture content detector is arranged in the filter bed.

Preferably, the gas gallery is provided with a gas outlet.

Preferably, the system further comprises a humidity sensor, wherein the humidity sensor is arranged in the filtering bed or a gas outlet of the gas gallery.

Preferably, the system further comprises a controller, and the controller is respectively connected with the second water replenishing control valve, the water receiver, the moisture content detector and the humidity sensor, and is used for receiving the filler moisture content signal detected by the moisture content detector and the humidity signal of the filtered air detected by the humidity sensor, sending a valve opening and closing signal to the second water replenishing control valve to control the second water replenishing control valve to open and close, and sending a baffle opening and closing signal to the water receiver to control the water receiver opening and closing communication port.

More preferably, the controller is connected with a traction piece in the water collector.

Preferably, when the number of the tank bodies is plural, the gas outlet of the first tank body is communicated with the gas inlet of the second tank body along the traveling direction of the exhaust gas, and the circulating liquid storage tanks of the plural tank bodies are communicated through a pipeline.

More preferably, a plurality of the circulating liquid storage tanks are externally connected with a single circulating pump through pipelines.

The second aspect of the invention provides an efficient oxidation and biological filtration multiplication deodorization process, which comprises the following steps: the waste gas is subjected to biological trickling filtration and biological filtration at least once in order to purify the waste gas.

Preferably, the process adopts the system, and comprises the following steps:

1) inputting waste gas into a trickling filter through a waste gas inflow area, and performing biological trickling filtration after water is distributed in the trickling filter bed through a water distribution area;

2) and (3) inputting the waste gas subjected to the biological trickling filtration into a filter tank, distributing water in a filter bed through an irrigation area, performing biological filtration, and discharging the water through a gas gallery.

More preferably, in step 1), the residence time of the off-gas in the trickling filter bed is 2 to 10 seconds, preferably 3 to 6 seconds.

More preferably, in step 2), the residence time of the off-gas in the filter bed is 15 to 30 seconds, preferably 18 to 25 seconds.

More preferably, the total residence time of the off-gas in the trickling filter bed and the filter bed is 20 to 35 seconds, preferably 20 to 30 seconds.

More preferably, in step 2), the moisture content of the packing in the filtration bed is 20-80% (w/w), preferably 40-60% (w/w).

More preferably, in step 2), the relative humidity of the air in the gas gallery is equal to or greater than 80%, preferably 90%.

More preferably, in the step 2), the humidity of the filter bed is characterized by detecting double parameters of the moisture content in the filler of the filter bed and the humidity in the filtered air, so that the microorganisms are ensured to have proper working conditions.

As described above, the deodorization system and the process thereof provided by the invention are used for deodorization and VOC control in the field of environmental engineering waste gas treatment, can realize high-efficiency oxidation and biological filtration multiplication, and have the following beneficial effects:

(1) the efficient oxidation and biological filtration multiplication deodorization system and the process thereof are different from the traditional biological filtration system, have the characteristics of modularization and combination, and combine two biological reaction modes of biological trickling filtration and biological filtration in the same reaction device, so that the biological filtration system is suitable for the purification of waste gas with more components and wider concentration range.

(2) The efficient oxidation and biological filtration multiplication deodorization system and the process thereof do not need to additionally arrange an air humidifying device, so that the humidifying step in the traditional process is omitted, and the moisture content and the air humidity in the biological filtration bed are controlled more simply, conveniently and reliably.

(3) According to the efficient oxidation and biological filtration multiplication deodorization system and the process thereof, the characteristics that the biological trickling filter can tolerate higher waste gas concentration, the biological filtration can process water-insoluble gas components and has lower outlet concentration are utilized, so that the whole system can process waste gas with higher concentration and more complex components, and a better waste gas treatment effect is obtained.

(4) The invention provides a high-efficiency oxidation and biological filtration multiplication deodorization system and a process thereof, which use a special composite engineering biological filter material, so that the surface adsorption performance of the filter material is enhanced, microorganisms are easy to adhere and grow, the start-up time of a biological filter tank can be reduced, the biological filter system can effectively adsorb components to be treated in waste gas, and the biological filter tank can perform functions.

(5) The invention provides a high-efficiency oxidation and biological filtration multiplication deodorization system and a process thereof, which are provided with a filter bed double-parameter humidity adjusting system capable of automatically operating, and can better control the humidity environment in a biological filter tank through a double-parameter mechanism for measuring and controlling the relative humidity of gas and the moisture content in the filter tank, realize the accurate control of the humidity of the biological filter bed and keep the proper growth environment of microorganisms.

(6) The efficient oxidation and biological filtration multiplication deodorization system and the process thereof provided by the invention adopt a single box structure, are convenient to install and transport, can be used as a processing unit independently, can also be used as a component module to combine a multi-module processing system, and are suitable for various air quantities of waste gas.

(7) According to the efficient oxidation and biological filtration multiplication deodorization system and the process thereof, the effective retention time of the biological filtration section of the combined treatment device can be greatly shortened, so that the total effective retention time (24-30 seconds) is greatly shortened compared with that of the traditional biological filtration device (generally requiring 35-60 seconds), and the volume of the system and the use amount of filter materials can be greatly saved.

(8) According to the efficient oxidation and biological filtration multiplication deodorization system and the process thereof, the oxidant can be properly added through the spraying system, so that the oxidation treatment of waste gas pollutants can be realized, organic matters which are difficult to biodegrade can be degraded, the treatment effect of biological treatment can be improved, the biological metabolism in a biological system can be promoted, and the efficient operation of the system can be ensured.

Drawings

FIG. 1 is a schematic diagram showing the operation structure of an efficient oxidation and biological filtration multiplication deodorization system according to the present invention.

FIG. 2 is a schematic diagram of the signal transmission structure of an efficient oxidation and bio-filtration multiplying deodorization system according to the present invention.

Fig. 3 is a schematic structural diagram of a water collector of an efficient oxidation and biological filtration multiplication deodorization system according to the present invention.

Reference numerals

1 case body

2 drop filter

21 inflow zone of exhaust gas

22-drip filter bed

23 water distribution area

24 circulating liquid storage tank

241 first water replenishing pipe

242 first water replenishing control valve

25 gas inlet

26 water distribution mechanism

261 water distribution pipe

262 shower head

27 nutrient solution infusion tube

28-drip filtering waste liquid discharge pipe

29 circulating pump

3 filtering pool

31 irrigation area

32 filtering bed

33 gas gallery

34 irrigation mechanism

341 irrigation pipe

342 nozzle

343 second water replenishing pipe

344 second water replenishing control valve

35 gas outlet

4 partition wall

5-way port

6 water collector

61 baffle

62 guide rail

63 tractor component

7 moisture content detector

8 humidity sensor

9 controller

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present specification.

Please refer to fig. 1 to 3. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not to be construed as limiting the scope of the present disclosure, which is defined by the claims and the appended claims. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

The invention provides a high-efficiency oxidation and biological filtration multiplication deodorization system, which comprises at least one box body 1 as shown in figure 1, wherein a trickling filter 2 and a filter tank 3 are sequentially arranged in the box body 1 along the advancing direction of waste gas; an exhaust gas inflow area 21, a trickling filter bed 22 and a water distribution area 23 are sequentially arranged in the trickling filter 2 along the exhaust gas advancing direction, and a circulating liquid storage tank 24 is arranged below the exhaust gas inflow area 21; an irrigation area 31, a filtering bed 32 and a gas gallery 33 are sequentially arranged in the filtering tank 3 along the advancing direction of the waste gas.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1, a partition wall 4 is arranged between the trickling filter 2 and the filter tank 3, a communicating port 5 is arranged on the partition wall 4, the trickling filter 2 is communicated with the filter tank 3 through the communicating port 5, and a water collector 6 is arranged on the communicating port 5.

In a preferred embodiment, as shown in fig. 3, the water collector 6 comprises a baffle 61, a guide rail 62 and a traction member 63, wherein the traction member 63 is connected with the baffle 61, and the traction member 63 pulls the baffle 61 to slide on the guide rail 62. The water collector 6 is used for removing water.

The baffle 61 is provided with at least one corrugated wire mesh, which can reduce the moisture entering the filter tank 3.

The baffle 61 is connected with the guide rail 62 in a sliding mode.

The traction member 63 is a commercially available electric push-pull rod. The material is stainless steel round steel.

In the high efficiency oxidation, biological filtration, multiplication and deodorization system provided by the present invention, as shown in fig. 1 and 2, the exhaust inflow region 21 is provided with a gas inlet 25. For the input of exhaust gases.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1 and 2, the filler in the trickling filtration bed 22 is a PP or PE filler developed by shorea environmental protection practice ltd, shanghai, for the attachment growth of microorganisms and the contact of gas and water, so as to transfer pollutants in the exhaust gas into water.

In the high-efficiency oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1 and 2, a water distribution mechanism 26 is arranged in the water distribution area 23, the water distribution mechanism 26 comprises a water distribution pipe 261 and a plurality of spray headers 262 arranged at one end of the water distribution pipe 261, the water distribution pipe 262 penetrates through the tank body 1, and the other end of the water distribution pipe 262 is communicated with the circulating liquid storage tank 24.

In a preferred embodiment, as shown in fig. 1 and 2, the water distribution pipe 261 is provided with a circulating pump 29. The circulating pump 29 is used for sucking the circulating water in the circulating liquid storage tank 24, conveying the circulating water to the water distribution mechanism 26, and spraying the circulating water on the water distribution area 23 and the trickling filtration bed 22 by the spraying head 262.

In a preferred embodiment, as shown in fig. 1 and 2, the water distributor 261 is externally connected with a nutrient solution input pipe 27 and a trickling waste liquid discharge pipe 28.

Specifically, the nutrient solution input pipe 27 is used for adding a nutrient agent to the circulating water, and the nutrient agent is used for supplementing nutrients required by microorganisms, ensuring the normal growth of the microorganisms and degrading organic matters and inorganic matters in the waste gas. The nutritional agent is a conventional commercial nutritional agent, consists of N, P and trace elements, can be stored for a long time, and is easily soluble in water. The nutrient is specifically a mixed solution of potassium dihydrogen phosphate, urea, glucose, ferrous sulfate, zinc sulfate and cobalt chloride.

Specifically, the trickling waste discharge pipe 28 is used to discharge part of the circulating water to avoid the circulating water concentration from being too high.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the present invention, as shown in fig. 1 and 2, a first water supplement pipe 241 is externally connected to the circulation liquid storage tank 24, and a first water supplement control valve 242 is provided on the first water supplement pipe 241. For replenishing the circulating water in the circulating liquid storage tank 24 and controlling the replenishing water amount so as to keep the circulating water amount stable.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the present invention, as shown in fig. 1 and 2, an irrigation mechanism 34 is disposed in the irrigation area 31, and the irrigation mechanism 34 includes an irrigation pipe 341 and a plurality of nozzles 342 disposed on the irrigation pipe 341.

The irrigation mechanism 34 is used to adjust the humidity of the filter bed 32 to ensure a suitable environment for the growth of microorganisms.

In a preferred embodiment, as shown in fig. 1 and 2, a second water replenishing pipe 343 is externally connected to the irrigation pipe 341, and a second water replenishing control valve 344 is arranged on the second water replenishing pipe 343.

The second water replenishing control valve 344 can adjust the irrigation frequency and the irrigation amount, and further adjust the humidity of the filter bed 32 to ensure a proper environment for the growth of microorganisms.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1 and 2, the filler in the filter bed 32 is a biological filter material developed by shorea environmental protection industry ltd, shanghai, and the filter material takes a plurality of minerals such as silicon, aluminum, iron and the like as a base material, and the base material is coated with activated carbon, iron, copper and calcium carbonate, so that the efficient oxidation and biological filtration multiplication deodorization system has good adsorption performance and microorganism attachment growth performance and is used for providing a carrier for microorganism attachment growth.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1 and 2, a moisture content detector 7 is arranged in the filter bed 32. The moisture content measuring instrument 7 is a conventionally used moisture content measuring instrument, and is inserted into the filler through a probe for analysis.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1 and 2, the gas outlet 35 is arranged on the gas gallery 33. For outputting the treated exhaust gas.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 1 and 2, the system further comprises a humidity sensor 8, and the humidity sensor 8 is arranged in the filter bed 32 or the gas outlet of the gas gallery 33. The humidity sensor 8 is a conventionally used air humidity sensor for analyzing the relative humidity of air.

In the efficient oxidation and biological filtration multiplication deodorization system provided by the invention, as shown in fig. 2, the system further comprises a controller 9, and the controller 9 is respectively connected with the second water replenishing control valve 344, the water collector 6, the moisture content detector 7 and the humidity sensor 8, and is used for receiving the filler moisture content signal detected by the moisture content detector 7 and the humidity signal of the filtered air detected by the humidity sensor 8, sending a valve opening and closing signal to the second water replenishing control valve 344 to control the opening and closing of the second water replenishing control valve 344, and sending a baffle opening and closing signal to the water collector 6 to control the opening and closing of the communication port 5 of the water collector 6.

In a preferred embodiment, the controller 9 is connected to a traction member 63 in the water collector 6.

The controller 9 is a conventionally used controller. Those skilled in the art will appreciate that the calculation, comparison, judgment and instruction output processes of the controller can be implemented by using integrated circuit modules, programmable logic devices, other hardware or installing corresponding software modules in the prior art.

The controller 9 has stored thereon a computer program which, when executed, can compare the data of the moisture content of the filler in the moisture content detector 7 with a preset limit value of the moisture content of the filler, compare the data of the relative humidity of the air from the humidity sensor 8 with a preset limit value of the relative humidity of the air, and when any one of the indexes of the relative humidity of the air or the moisture content of the filler in the filter bed is out of a set range, a signal is fed back to the controller 9 to adjust the irrigation amount of the bio-irrigation system by closing or opening the water receiver 6 or by closing or opening the second water supply control valve 344.

The first and second water replenishment control valves 242 and 344 are solenoid valves that are used conventionally.

In the high-efficiency oxidation, biological filtration, multiplication and deodorization system provided by the invention, when the number of the box bodies 1 is multiple, the gas outlet 35 of the front box body 1 is communicated with the gas inlet 25 of the rear box body 1 along the advancing direction of the waste gas, and the circulating liquid storage tanks 24 of the box bodies 1 are communicated through pipelines.

In a preferred embodiment, a plurality of the circulation liquid storage tanks 24 are externally connected with a single circulation pump 29 through pipelines. And a circulating pump 29 is shared, so that electric equipment is reduced, and the floor area is saved.

The invention further provides a high-efficiency oxidation and biological filtration multiplication deodorization process, which comprises the following steps: the waste gas is subjected to biological trickling filtration and biological filtration at least once in order to purify the waste gas.

Specifically, the process adopts the efficient oxidation and biological filtration multiplication deodorization system, and comprises the following steps:

2) the waste gas after biological trickling filtration is input into a filter tank through a water collector on the communicating port, is subjected to biological filtration after being distributed in a filter bed through an irrigation area, and is discharged through a gas gallery.

Example 1

The sewage pump room, grid well, primary sedimentation tank, aeration tank, sludge dewatering room and other treatment structures of a certain urban sewage plant generate a large amount of substances containing hydrogen sulfide and other odors, H₂The S content reaches 100mg/m³And odor reaches 25000, which requires collection and disposal. After obtaining the high-efficiency oxidation and biological filtration multiplication deodorization system shown in fig. 1-3, a user inputs the gas into 1 box body 1 from a gas inlet through a pipeline, firstly inputs the gas into a waste gas inflow area 21 of a trickling filter 2, and then stays the gas for 2-10 seconds through a trickling filter bed 22 to enter a water distribution area 23. The first water supply control valve 242 is started, the circulating water which is input into the circulating liquid storage tank 24 through the first water supply pipe 241 is uniformly sprayed in the trickling filter 2 through the circulating pump 29 through the water distribution pipe 261 by the spray header 262, and the gas is humidified without adopting an air humidifying device. Meanwhile, nutrient is added to the circulating water in the water distribution pipe 261 through the nutrient solution input pipe 27, and part of the circulating water is discharged through the trickling filtration waste liquid discharge pipe 28 to avoid the circulating water concentration from being too high. The first water replenishment control valve 242 is actuated to maintain the water level of the circulation liquid storage tank 24 stable through the first water replenishment pipe 241.

The waste gas treated by the trickling filter 2 enters the filter tank 3 through the communication port 5, and the water collector 6 on the communication port 5 is opened or closed, so that the humidity of the air entering the filter tank 3 is controlled. The water collector 6 can be opened in the season of relatively dry air in winter, so that more moisture enters the filter tank 3; and in summer season with damp air, the water collector 6 can be closed to remove part of the water mixed in the air and reduce the water entering the filter tank 3.

The gas entering the filtration tank 3 flows from top to bottom into the irrigation zone 31 and then into the filtration bed 32. In the irrigation zone 31, the second water supply control valve 344 is actuated to spray irrigation water from the irrigation pipe 341 through the nozzle 342 of the irrigation mechanism 34 via the second water supply pipe 343. The gas is adsorbed and degraded by microorganisms in the filtering and filtering bed 32, and the treated clean gas flows out from the gas outlet 35 through the gas gallery 33 and is discharged into the atmosphere. In the process, the moisture content of the filler in the filter bed 32 and the relative humidity of the air are respectively detected by a moisture content detector 7 arranged in the filter bed 32 and a humidity sensor 8 arranged at the gas outlet 35, so that the requirement that the moisture content of the filler is 20-80% and the relative humidity of the air is more than or equal to 80% is met. When any index of the relative humidity of the air or the moisture content of the filler in the filter bed exceeds a set range, a filler moisture content signal or an air humidity signal is sent to the controller 9, after the controller 9 receives the signal, an opening and closing valve signal is sent to the second water replenishing control valve 344 to control the opening and closing of the second water replenishing control valve 344 so as to adjust the irrigation quantity of the biofilter irrigation system, and an opening and closing baffle signal is sent to the water receiver 6 to control the water receiver 6 to open and close the communication port 5 so as to ensure that the humidity of the filter bed 32 is controlled in an optimal humidity range.

For the case of large gas amount, two or more of the tanks 1 may be connected in parallel, and when the number of the tanks 1 is plural, the gas outlet 35 of the preceding tank 1 is communicated with the gas inlet 25 of the following tank 1 in the traveling direction of the exhaust gas, and the circulating liquid storage tanks 24 of the plural tanks 1 are communicated via a pipeline. A plurality of circulating liquid storage tanks 24 can share one circulating pump 29 through pipelines, so that electric equipment is reduced, and floor space is saved.

The removal rates obtained after the waste gas was treated by the combined biofiltration waste gas purification system are shown in table 1. As can be seen from table 1, the removal rate of pollutants in the exhaust gas was > 95%.

TABLE 1

	Unit of	Inlet concentration	Odor characteristics	Average removal Rate%
					Concentration of odor	--	24544	--	96.6
NH₃	mg/m³	15.2	Irritation property	99.9
					H₂S	mg/m³	107	Stink egg	99.9
Ethylamine (ethylamine)	mg/m³	12.0	Irritation property	>99.9
					Dimethyl sulfide	mg/m³	777.25	Special stink smell	>99.9

In conclusion, the efficient oxidation and biological filtration multiplication deodorization system and the process thereof provided by the invention are used for deodorization and VOC control in the field of environmental engineering waste gas treatment, and can treat waste gas with higher concentration and more complex components by combining two biological reaction modes of biological trickling filtration and biological filtration, and obtain better waste gas treatment effect. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be accomplished by those skilled in the art without departing from the spirit and scope of the present invention as set forth in the appended claims.

Claims

1. A high-efficiency oxidation and biological filtration multiplication deodorization system is characterized by comprising at least one box body (1), wherein a trickling filter (2) and a filter tank (3) are sequentially arranged in the box body (1) along the advancing direction of waste gas; an exhaust gas inflow area (21), a trickling filter bed (22) and a water distribution area (23) are sequentially arranged in the trickling filter (2) along the exhaust gas advancing direction, and a circulating liquid storage tank (24) is arranged below the exhaust gas inflow area (21); an irrigation area (31), a filtering bed (32) and a gas gallery (33) are sequentially arranged in the filtering tank (3) along the advancing direction of the waste gas.

2. An efficient oxidation, biological filtration multiplication deodorization system as recited in claim 1, wherein a partition wall (4) is disposed between said trickling filter (2) and said filter tank (3), said partition wall (4) is provided with a communication port (5), said trickling filter (2) is communicated with said filter tank (3) through said communication port (5), and said communication port (5) is provided with a water receiver (6).

3. A high efficiency oxidation, biofiltration multiplication deodorization system as claimed in claim 2, wherein said water collector (6) comprises a baffle (61), a guide rail (62), and a traction member (63), said traction member (63) is connected with the baffle (61), said traction member (63) pulls the baffle (61) to slide on the guide rail (62).

4. An efficient oxidation, biofiltration multiplication deodorization system according to claim 1, wherein said trickling filter (2) includes any one or more of the following conditions:

A1) a water distribution mechanism (26) is arranged in the water distribution area (23), the water distribution mechanism (26) comprises a water distribution pipe (261) and a plurality of spray headers (262) arranged at one end of the water distribution pipe (261), the water distribution pipe (261) penetrates through the box body (1), and the other end of the water distribution pipe (261) is communicated with the circulating liquid storage tank (24);

A2) the waste gas inflow area (21) is provided with a gas inlet (25);

A3) the circulating liquid storage tank (24) is externally connected with a first water supplementing pipe (241), and a first water supplementing control valve (242) is arranged on the first water supplementing pipe (241).

5. The high efficiency oxidizing, biofiltration multiplying and deodorizing system as claimed in claim 1, wherein said filtration basin includes any one or more of the following conditions:

B1) an irrigation mechanism (34) is arranged in the irrigation area (31), and the irrigation mechanism (34) comprises an irrigation pipe (341) and a plurality of nozzles (342) arranged on the irrigation pipe (341); a second water replenishing pipe (343) is externally connected with the irrigation pipe (341), and a second water replenishing control valve (344) is arranged on the second water replenishing pipe (343);

B2) a moisture content detector (7) is arranged in the filtering and filtering bed (32);

B3) the gas gallery (33) is provided with a gas outlet (35).

6. An efficient oxidation, biofiltration multiplication deodorization system as claimed in claim 1, further comprising a humidity sensor (8), said humidity sensor (8) being located within the filter bed (32) or at the gas outlet of the gas gallery (33).

7. The high-efficiency oxidation and biological filtration multiplication deodorization system according to any one of claims 2, 5 or 6, further comprising a controller (9), wherein the controller (9) is respectively connected to the second water replenishing control valve (344), the water collector (6), the moisture content detector (7) and the humidity sensor (8), and is configured to receive a filler moisture content signal detected by the moisture content detector (7) and a humidity signal detected by the humidity sensor (8) of the filtered air, send a valve opening/closing signal to the second water replenishing control valve (344) to control the second water replenishing control valve (344) to open or close, and send a baffle opening/closing signal to the water collector (6) to control the opening/closing connection port (5) of the water collector (6).

8. An efficient oxidation, biofiltration, multiplication and deodorization system as claimed in claim 1, wherein when said plurality of said housings (1) are provided, a gas outlet (35) of a preceding said housing (1) is communicated with a gas inlet (25) of a succeeding said housing (1) in a traveling direction of exhaust gas, and circulating liquid storage tanks (24) of a plurality of said housings (1) are communicated through a pipe.

9. An efficient oxidation and biological filtration multiplication deodorization process, which comprises the following steps: the waste gas is subjected to biological trickling filtration and biological filtration at least once in sequence to purify the waste gas.

10. An efficient oxidation and biological filtration multiplying deodorization process as recited in claim 9, wherein said efficient oxidation and biological filtration multiplying deodorization system as recited in any one of claims 1-8 is adopted, comprising the steps of: