A combined step-coupling deodorization method and device

Abstract

This invention discloses a combined cascade coupling deodorization method and equipment, comprising a scrubbing tower, a biotrickling filter tower, and a filtration tower connected in sequence. The scrubbing tower contains a spray assembly, a polymer corrugated baffle scrubbing zone polymer packing assembly, and an oil removal filter. The biotrickling filter tower contains several trickling zones polymer biological packing assemblies and a circulating water assembly. The filtration tower contains several filtration units. The system also includes a control system comprising a detection module and a control module. Exhaust gas passes sequentially through the scrubbing tower, biotrickling filter tower, and filtration tower, with the final outlet exhaust gas containing less than 0.1 mg / Nm³ of hydrogen sulfide. 3 The odor concentration is <200. The control system automatically detects and adjusts each process to achieve intelligent processing.

Description

Technical Field

[0001] The invention relates to the technical field of deodorization of domestic waste transfer stations and kitchen waste treatment plants, and in particular to a combined step-coupling deodorization method and equipment thereof. Background Art

[0002] Mainly used in domestic waste transfer stations and food waste treatment plants where high concentrations of hydrogen sulfide, methyl mercaptan, TRS (total reduced sulfur) gas, VOCs, particulate matter, animal and vegetable oils, etc. are generated during waste treatment. Hydrogen sulfide 10-30mg / Nm 3 , odor concentration 20000-50000, exhaust chimney height is limited (when there is a situation where the exhaust chimney is lower than 15m or cannot be higher than the surrounding buildings according to the site conditions) and the emission standards are strict. At present, most deodorization reactors have low treatment efficiency, especially lack of effective measures to remove animal and vegetable oils, cannot adapt to the current and future stricter exhaust gas emission standards, and have low self-control, low operation convenience and high control difficulty. Generally, only the inlet and outlet hydrogen sulfide concentration and the pH value of the spray liquid are detected. Summary of the invention

[0003] In view of the defects and shortcomings of the above-mentioned prior art, a combined step-coupled deodorization device is provided, comprising a washing tower, a bio-trickling filter tower and a filtering tower connected in sequence, wherein a vertical partition is arranged in the washing tower, and the two sides of the vertical partition are respectively a primary washing zone and a secondary washing zone; a flow port is arranged in the middle and lower part of the vertical partition, and the flow port connects the primary washing zone with the secondary washing zone; a first spray assembly and a second spray assembly are respectively arranged in the primary washing zone and the secondary washing zone, a polymer corrugated folded plate is arranged in the primary washing zone, and a washing zone polymer filler assembly and an oil removal filter are arranged in the secondary washing zone from bottom to top; The biological trickling filter tower is provided with a plurality of trickling filter zone polymer biological filler components and circulating water components; the filter tower is provided with a plurality of filtering units; the top of the primary washing zone is provided with a first air inlet, the top of the secondary washing zone is provided with a first air outlet, the bottom of the biological trickling filter tower is provided with a second air inlet, the top is provided with a second air outlet, the bottom of the filter tower is provided with a third air inlet, the top is provided with a third air outlet, the exhaust gas enters the washing tower from the first air inlet, passes through the washing tower, the biological trickling filter tower, the filter tower in sequence, and is finally discharged from the third air outlet; and a control system is also included, and the control system includes a detection module and a control module.

[0004] Preferably, the first spray assembly includes a first spray water tank, which is connected to a first nozzle assembly through a first spray pipe, the first nozzle assembly is arranged at the top of the primary washing area, and the first spray water tank is connected to a sodium hydroxide dosing device; the second spray assembly includes a second spray water tank, which is connected to a second nozzle assembly through a second spray pipe, the second nozzle assembly is arranged at the upper part of the polymer filler assembly, and the second spray water tank is connected to a sodium hypochlorite dosing device; the vertical partition is arranged at the upper part of the first spray water tank and the second spray water tank, and a transverse partition is also arranged above the first spray water tank, the inclination angle of the transverse partition is 30°-40°, and a conical separation disk is also arranged at the upper part of the second spray water tank.

[0005] Preferably, the circulating water assembly includes a circulating water tank, the circulating water tank is connected to a third nozzle assembly via a circulating pipe, and the third nozzle assembly is arranged on the top of the plurality of dripping zone polymer biological filler assemblies; the circulating water tank is connected to a sodium hydroxide dosing device and a nutrient solution dosing device; the second spray assembly and the third nozzle assembly are spiral nozzles.

[0006] Preferably, the first nozzle assembly includes a first resonance chamber and a second resonance chamber which are distributed in sequence up and down, and the first resonance chamber and the second resonance chamber are separated by a Venturi narrow opening; the first nozzle assembly also includes a washing liquid distribution pipe and a compressed gas inlet pipe arranged at the upper part of the first resonance chamber, and the washing liquid distribution pipe is connected to the first spray water tank; the first nozzle assembly also includes a washing liquid nozzle, and the washing liquid nozzle is arranged at the lower part of the second resonance chamber.

[0007] Preferably, the washing zone polymer biological filler assembly includes a No. 1 polymer filler module and a No. 2 polymer filler module; the second nozzle assembly includes a No. 1 spray branch and a No. 2 spray branch; the No. 1 spray branch is arranged on the upper part of the No. 1 polymer filler module, and the No. 2 spray branch is arranged on the upper part of the No. 2 polymer filler module; the trickling zone polymer biological filler assembly includes a No. 1 biological polymer filler module and a No. 2 polymer biological filler module; the third nozzle assembly includes a No. 3 spray branch and a No. 4 spray branch; the No. 3 spray branch is arranged on the upper part of the No. 1 polymer filler module, and the No. 4 spray branch is arranged on the upper part of the No. 2 polymer biological filler module.

[0008] Preferably, the several filter units include a chemical filtration component and an inorganic biological filler component arranged in sequence from top to bottom; the chemical filtration component is provided with a primary gas-phase chemical filter material, a secondary gas-phase chemical filter material and a medium-efficiency filter in sequence from the outside to the inside; the chemical filtration component is provided with a medium-efficiency filter loading and unloading port, a chemical filter material feeding port and a chemical filter material unloading port, and the medium-efficiency filter is installed into the chemical filtration component through the medium-efficiency filter loading and unloading port; the inorganic biological filler component includes a hydrophobic inorganic substance module, a nutrient substance module and a microbial module.

[0009] Preferably, the first spray water tank is also connected to a first water replenishment electric valve and a first drainage electric valve; the first spray pipe is provided with a first spray pump; the second spray water tank is also connected to a second water replenishment electric valve and a second drainage electric valve; the second spray pipe is provided with a second spray pump; the circulating water tank is also connected to a third water replenishment electric valve, a third drainage electric valve and a heating device; the circulating pipe is provided with a circulating pump; a humidification pipeline is also provided on the upper part of the inorganic biological filler assembly, and humidification nozzles are evenly distributed on the humidification pipeline; a sewage tank is provided at the bottom of the filter tower, and the sewage tank is connected to a sewage discharge electric valve.

[0010] Preferably, a demister is further provided in the filtration tower, and the demister is arranged between the chemical filtration component and the inorganic biological filler component; the air inlet and air outlet ends of the demister are also respectively provided with spray cleaning pipes, and cleaning spray heads are evenly distributed on the spray cleaning pipes.

[0011] Preferably, the detection module includes a hydrogen sulfide detector, a non-methane total hydrocarbon detector, a residual chlorine detector, a pH detector, a temperature detector, a humidity detector, a conductivity detector, a liquid level detector, a pressure detector and a differential pressure detector; the hydrogen sulfide detector and the non-methane total hydrocarbon detector are arranged on the third gas outlet; the first spray water tank is provided with the pH detector, the conductivity detector and the liquid level detector, the second spray water tank is provided with the residual chlorine detector, the conductivity detector and the liquid level detector, the circulating water tank is provided with the pH detector, the conductivity detector, the temperature detector and the liquid level detector; the first pressure detector is arranged on the first spray pipe; the second pressure detector is arranged on the circulating pipe. The humidity detector is arranged between the humidification pipeline and the inorganic biological filler component.

[0012] A combined step-coupled deodorization method is also provided, which uses the above-mentioned combined step-coupled deodorization equipment and is characterized in that it includes the following steps: S1, turning on a sodium hydroxide dosing device, a nutrient solution dosing device and a sodium hypochlorite dosing device; turning on the first spray component and the second spray component to spray the washing tower, and turning on the circulating water component to spray the polymer biological filler component in the trickling filter area; S2, turning on the centrifugal fan, and the exhaust gas passes through the washing tower, the biological trickling filter tower and the filter tower in sequence; and also includes a control process: detecting a target value through the detection module, and controlling the first spray component, the second spray component and the circulating water component through the control module.

[0013] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0014] 1. The combined step-coupling deodorization method and equipment provided by the present invention enable the hydrogen sulfide gas in the exhaust gas to be neutralized by the sodium hydroxide in the primary washing area, and the large solid particles and animal and plant oils in the exhaust gas are mixed with water to form small droplets, which pass through the polymer corrugated folding plate, are changed in flow direction by the folding plate, and are captured on the surface of the folding plate after the flow rate is reduced. The small droplets containing oil and solid particles are separated because their specific gravity is higher than that of the exhaust gas, and flow into the first spray water tank along the transverse partition; the exhaust gas in which most of the hydrogen sulfide is neutralized and removed continues to enter the secondary washing tower area, and the sodium hypochlorite solution sprayed in the secondary washing tower area chemically oxidizes the methyl mercaptan and the total reduced sulfide gas in the exhaust gas to generate odorless salts, and removes the remaining oil in the exhaust gas through the oil removal filter; and the No. 1 polymer filler module and the No. 2 polymer filler module are arranged in the secondary washing tower area, which have a higher specific surface area, increase the gas-liquid mass transfer area, and improve the removal efficiency of the reduced sulfide gas. Then, the bio-trickling filter tower is used for microbial degradation, and chemical adsorption and redox reaction occur with the bio-trickling filter in the inorganic biological filler component and the chemical filtration component in the filter tower. Finally, the hydrogen sulfide in the exhaust gas at the outlet is less than 0.1 mg / Nm 3 , odor concentration <200; and through the control system, automatic detection and automatic adjustment are carried out in each process to achieve intelligent processing.

[0015] 2. The combined step-coupling deodorization method and equipment provided by the present invention removes mist in the exhaust gas by setting the demister to enhance the deodorization effect, and is provided with a cleaning spray head to clean the demister.

[0016] 3. The combined step-coupling deodorization method and equipment provided by the present invention maintains the optimal growth temperature of the microorganisms in the polymer biological filler by setting the heating device, thereby ensuring the deodorization effect of the biological deodorization component.

[0017] 4. The combined step-coupling deodorization method and equipment provided by the present invention enhances the biological trickling filtration effect by providing a two-stage polymer biological filler module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An axial cross-sectional view of the combined step-coupled deodorizing device provided by the present invention;

[0019] Figure 2 A radial cross-sectional view of the combined step-coupled deodorizing device provided by the present invention;

[0020] Figure 3 An axial cross-sectional view of the first nozzle assembly of the combined step-coupled deodorizing device provided by the present invention.

[0021] Among them: 1-first air inlet, 2-third air outlet, 3-first connecting pipe, 4-second connecting pipe, 5-transverse partition, 6-separation plate, 7-flow port, 8-first spray assembly, 801-first spray pump, 802-first sodium hydroxide dosing device, 803-first water replenishment electric valve, 804-first drainage electric valve, 805-first spray pipe, 806-first nozzle assembly, 80601-compressed gas inlet pipe, 80602-washing liquid distribution pipe, 80603-first resonance chamber, 80604-second resonance chamber, 80605 - washing liquid nozzle, 807- first spray water tank, 9- second spray assembly, 901- second spray pump, 902- sodium hypochlorite dosing device, 903- second water replenishment electric valve, 904- second drainage electric valve, 905- second spray pipe, 906- second spray water tank, 10- polymer corrugated plate, 11- washing area polymer filler assembly, 12- oil removal filter, 13- primary washing tower area, 14- secondary washing tower area, 15- trickling filter area polymer biological filler assembly, 16- circulating water assembly, 1601- circulating pump, 1602- second Sodium hydroxide dosing device, 1603-nutrient solution dosing device, 1604-third water replenishment electric valve, 1605-third drainage electric valve, 1606-circulating water tank, 1607-circulating pipe, 1608-spiral nozzle, 17-inorganic biological filler component, 18-medium efficiency filter loading and unloading port, 19-chemical filter material feeding port, 20-medium efficiency filter, 21-first-stage gas-phase chemical filter material, 22-second-stage gas-phase chemical filter material, 23-demister, 24-humidification electric valve, 25-spray cleaning pipe, 26-humidification nozzle, 27-sewage tank, 28-drain Sewage electric valve, 2901-first pressure detector, 2902-second pressure detector, 3001-No. 1 differential pressure detector, 3002-No. 2 differential pressure detector, 3003-No. 3 differential pressure detector, 3004-No. 4 differential pressure detector, 3005-No. 5 differential pressure detector, 3006-No. 6 differential pressure detector, 3007-No. 7 differential pressure detector, 3008-No. 8 differential pressure detector, 31-humidity detector, 32-pH detector, 33-conductivity detector, 34-liquid level detector, 35-temperature detector, 36-residual chlorine detector. DETAILED DESCRIPTION

[0022] The present invention will be described in more detail below with reference to the accompanying drawings showing embodiments of the present invention. However, the present invention may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are set forth in order to achieve a full and complete disclosure and to enable those skilled in the art to fully understand the scope of the present invention. In these drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

[0023] As attached Figure 1-3The present invention provides a combined step-coupling deodorization method and equipment thereof, comprising a washing tower, a biotrickling filter tower and a filtering tower connected in sequence, wherein a vertical partition is provided in the washing tower, and the two sides of the vertical partition are respectively a primary washing area 13 and a secondary washing area 14; a flow port 7 is provided in the middle and lower part of the vertical partition, and the flow port 7 connects the primary washing area 13 and the secondary washing area 14, and the exhaust gas enters the secondary washing area 14 from the primary washing area 13 through the flow port 7; a first spray component 8 and a second spray component 9 are respectively provided in the primary washing area 13 and the secondary washing area 14, which are used to spray the primary washing area 13 and the secondary washing area 14 respectively, a polymer corrugated folded plate 10 is provided in the primary washing area 13, which is used to change the exhaust gas flow direction, and a washing area polymer filler component 1 is provided in the secondary washing area 14 from bottom to top. 1 and oil removal filter 12; a plurality of trickling filter area polymer biological filler components 15 and circulating water components 16 are arranged in the biological trickling filter tower, and the circulating water components 16 are used to spray the plurality of trickling filter area polymer biological filler components 15; a plurality of filtering units are arranged in the filter tower; a control system is also included, and the control system includes a detection module and a control module; a first air inlet 1 is arranged at the top of the primary washing area 13, a first air outlet is arranged at the top of the secondary washing area 14, a second air inlet is arranged at the bottom of the biological trickling filter tower, and a second air outlet is arranged at the top, a third air inlet is arranged at the bottom of the filter tower, and a third air outlet is arranged at the top, and the waste gas enters the washing tower from the first air inlet 1, passes through the washing tower, the biological trickling filter tower, and the filter tower in sequence, and is finally discharged from the third air outlet 2; hydrogen sulfide in the waste gas at the final outlet is less than 0.1 mg / Nm 3 , odor concentration <200.

[0024] In this embodiment, the first spray assembly 8 includes a first spray water tank 807, and the first spray water tank 807 is connected to the first nozzle assembly 806 through the first spray pipe 805. The first nozzle assembly 806 is arranged at the top of the primary washing area 13. The first nozzle assembly 806 includes a first resonance chamber 80603 and a second resonance chamber 80604, which are sequentially distributed up and down, and the first resonance chamber 80603 and the second resonance chamber 80604 are separated by a venturi narrow mouth; the first nozzle assembly 806 also includes a washing liquid distribution pipe 80602 and a compressed gas intake pipe 80601 arranged at the upper part of the first resonance chamber 80603, and the washing liquid distribution pipe 80602 is connected to the first spray water tank 807; the first nozzle assembly 806 also includes a washing liquid nozzle 80605, and the washing liquid nozzle 80605 is arranged at the lower part of the second resonance chamber 80604. The first spray water tank 807 is connected to the first sodium hydroxide dosing device 802, and the sodium hydroxide is sprayed into the primary washing area 13 through the first nozzle assembly 806. The second spray assembly 9 includes a second spray water tank 906, which is connected to the spiral nozzle 1608 through the second spray pipe 905. The spiral nozzle 1608 is arranged on the upper part of the polymer filler assembly 11 in the washing area, and the second spray water tank 906 is connected to the sodium hypochlorite dosing device 902; the vertical partition is arranged on the upper part of the first spray water tank 807 and the second spray water tank 906, and the first spray water tank 807 is also provided with a transverse partition 5, the inclination angle of the transverse partition 5 is 30°-40°, and the upper part of the second spray water tank 906 is also provided with a conical separation disk 6. The circulating water component 16 includes a circulating water tank 1606, which is connected to a spiral nozzle 1608 through a circulating pipe 1607. The spiral nozzle 1608 is arranged on the top of several trickling filter area polymer biological filler components 15. The circulating water tank 1606 is connected to a second sodium hydroxide dosing device 1602 and a nutrient solution dosing device 1603, which are used to spray sodium hydroxide and nutrient solution on several trickling filter area polymer biological filler components 15.

[0025] In this embodiment, the washing zone polymer filler assembly 11 includes a polymer filler module No. 1 and a polymer filler module No. 2, the second nozzle assembly includes a spray branch No. 1 and a spray branch No. 2, the spray branch No. 1 is arranged on the upper part of the polymer filler module No. 1, and sprays sodium hypochlorite to the polymer filler module No. 1; the spray branch No. 2 is arranged on the upper part of the polymer filler module No. 2, and sprays sodium hypochlorite to the polymer filler module No. 2. The trickling zone polymer biological filler assembly 15 includes a polymer biological filler module No. 1 and a polymer biological filler module No. 2, the third nozzle assembly includes a spray branch No. 3 and a spray branch No. 4, the spray branch No. 3 is arranged on the upper part of the polymer biological filler module No. 1, and sprays sodium hydroxide and nutrient solution to the polymer biological filler module No. 1; the spray branch No. 4 is arranged on the upper part of the polymer biological filler module No. 2, and sprays sodium hydroxide and nutrient solution to the polymer biological filler module No. 2.

[0026] In this embodiment, several filter units include a chemical filtration component and an inorganic biological filler 17 component arranged in sequence from top to bottom; the chemical filtration component is provided with a first-level gas-phase chemical filter material 21, a second-level gas-phase chemical filter material 22 and a medium-efficiency filter 2018 from the outside to the inside; the chemical filtration component is provided with a medium-efficiency filter 2018 loading and unloading port, a chemical filter material feeding port 19 and a chemical filter material unloading port, and the medium-efficiency filter 2018 is installed into the chemical filtration component through the loading and unloading port of the medium-efficiency filter 2018; the inorganic biological filler 17 component includes a hydrophobic inorganic substance module, a nutrient substance module and a microbial module.

[0027] In this embodiment, the first spray water tank 807 is also connected to the first water replenishment electric valve 803 and the first drainage electric valve 804, and the first spray pipe 805 is provided with a first spray pump 801, through which the liquid in the first spray water tank 807 is transported to the first nozzle assembly 806 for spraying. The second spray water tank 906 is also connected to the second water replenishment electric valve 903 and the second drainage electric valve 904, and the second spray pipe 904 is provided with a second spray pump 901, through which the liquid in the second spray water tank 906 is transported to the second nozzle assembly for spraying. The circulating water tank 1606 is also connected to the third water replenishment electric valve 1604, the third drainage electric valve 1605 and the heating device, and the circulating pipe 1607 is provided with a circulating pump 1601, and the liquid in the circulating water tank 1606 is transported to the third nozzle assembly for spraying through the third spray pump. A humidification pipeline is also provided on the upper part of the inorganic biological filler 17 component, and humidification nozzles 26 are evenly distributed on the humidification pipeline to humidify the inorganic biological filler 17 component in time to ensure humidity. A sewage tank 27 is provided at the bottom of the filter tower, and a sewage discharge electric valve 28 is connected to the sewage tank 27 to discharge sewage regularly.

[0028] In this embodiment, a demister 23 is further provided in the filter tower, and the demister 23 is arranged between the chemical filtration component and the inorganic biological filler 17 component; the air inlet and air outlet ends of the demister 23 are also respectively provided with spray cleaning pipes 25, and cleaning spray heads are evenly distributed on the spray cleaning pipes 25.

[0029] In this embodiment, the detection module includes a hydrogen sulfide detector, a non-methane total hydrocarbon detector, a residual chlorine detector 36, a pH detector 32, a temperature detector 35, a humidity detector 31, a conductivity detector 33, a liquid level detector 34, a pressure detector and a differential pressure detector; the hydrogen sulfide detector and the non-methane total hydrocarbon detector are arranged on the third gas outlet 2; the first spray water tank 807 is provided with a pH detector 32, a conductivity detector 33 and a liquid level detector 34, the second spray water tank 906 is provided with a residual chlorine detector 36, a conductivity detector 33 and a liquid level detector 34, and the circulating water tank 1606 is provided with a pH detector 32, a conductivity detector 33, a temperature detector 35 and a liquid level detector 34; the first pressure detector 2901 is arranged on the first spray pipe 805; the second pressure detector 2902 is arranged on the circulating pipe 1607. The humidity detector 31 is arranged between the humidification pipeline and the inorganic biological filler 17 assembly. The differential pressure detectors include a first differential pressure detector 3001, a second differential pressure detector 3002, a third differential pressure detector 3003, a fourth differential pressure detector 3004, a fifth differential pressure detector 3005, a sixth differential pressure detector 3006, a seventh differential pressure detector 3007, and an eighth differential pressure detector 3008. The two ends of the No. 1 differential pressure detector 3001 are arranged at the two ends of the No. 1 polymer filler module; the two ends of the No. 2 differential pressure detector 3002 are arranged at the two ends of the No. 2 polymer filler module; the two ends of the No. 3 differential pressure detector 3003 are arranged at the two ends of the oil removal filter; the two ends of the No. 4 differential pressure detector 3004 are arranged at the two ends of the No. 1 polymer biological filler module; the two ends of the No. 5 differential pressure detector 3005 are arranged at the two ends of the No. 2 polymer biological filler module; the two ends of the No. 6 differential pressure detector 3006 are arranged at the two ends of the inorganic biological filler 17 module; the two ends of the No. 7 differential pressure detector 3007 are arranged on the air inlet end and the air outlet end of the demister 23; the two ends of the No. 8 differential pressure detector 3008 are arranged at the air inlet end and the air outlet end of the chemical filtration component.

[0030] The working process of the present invention is as follows:

[0031] 1. Preparation: Check the PLC control module, each detection module and valve to ensure that they maintain normal operation. Open the first water replenishment electric valve 803, the first drainage electric valve 804, the second water replenishment electric valve 903, the second drainage electric valve 904, the third water replenishment electric valve 1604, and the third drainage electric valve 1605 of the first spray water tank 807, the second spray water tank 906, and the circulating water tank 1606, and make them automatically operate, replenish water to the set height, and use the liquid level detector 34 to detect and ensure the liquid level position of the first spray water tank 807, the second spray water tank 906, and the circulating water tank 1606. The first sodium hydroxide dosing device 802, the second sodium hydroxide dosing device 1602, the sodium hypochlorite dosing device 902 and the nutrient solution dosing device 1603 are turned on and set to the automatic operation state, and sodium hydroxide is automatically added to the first spray water tank 807, sodium hypochlorite is automatically added to the second spray water tank 906, and nutrient solution and sodium hydroxide are automatically added to the circulating water tank 1606, so that the pH range of the liquid in the first spray water tank 807, the second spray water tank 906 and the circulating water tank 1606 is 6.5-8.5, and the residual chlorine concentration range is 0.75-1.25g / L. The first spray pump 801, the second spray pump 901 and the circulating pump 1601 are turned on to spray the washing liquid, and the pressure value on the spray pipe and the circulating pipe 1607 is kept ≤0.03MPa.

[0032] 2. Treatment process: Turn on the centrifugal fan on the air outlet duct to allow the waste gas to enter the washing tower from the first air inlet 1. The hydrogen sulfide in the waste gas is neutralized with the sodium hydroxide in the washing liquid, and enters the secondary washing tower through the flow port 7 with the air flow, and the gas and liquid are separated. Solid particles, waste water, oil, etc. go down to the first spray water tank 807, and the separated gas phase rises to the washing area polymer filler assembly 11 for microbial degradation. The separation disk 6 prevents the liquid level in the first spray water tank 807 and the second spray water tank 906 from being affected by the air flow, and prevents the gas and liquid from re-converging. The gas phase enters the polymer corrugated plate 10 of the primary washing tower area and the polymer filler assembly of the secondary washing tower area in turn, wherein part of the particulate matter and animal and plant oil in the waste gas collides with the polymer corrugated plate 10, and the gas flow direction changes, and combines with the spray liquid to generate large particulate matter and gravity settles into the first spray water tank 807, and part of the hydrogen sulfide reacts with sodium hydroxide to be removed; part of the hydrogen sulfide, methyl mercaptan, total reduced sulfide and VOCs in the waste gas are adsorbed on the surface of the polymer filler, oxidized and removed by sodium hypochlorite, and the remaining animal and plant oil in the waste gas is removed by the oil removal filter 12. Then it enters the polymer biological filler assembly 15 in the trickling filter area of ​​the biological trickling filter through the first connecting pipe 3 for biodegradation. Finally, it enters the filter tower through the second connecting pipe 4, and chemical adsorption and oxidation-reduction reactions occur through the inorganic biological filler 17 assembly and the chemical filtration assembly to further generate odorless small molecular substances, and the clean gas meets the discharge standards. The hydrogen sulfide in the treated waste gas is less than 0.1mg / Nm3 , odor concentration <200.

[0033] Control process: (a) The conductivity of the first spray water tank 807 and the second spray water tank 906 is detected by the conductivity detector 33. When the conductivity is greater than 20000uS / cm, the first drain electric valve 804 and the second drain electric valve 904 are automatically opened through the PLC control module. The conductivity of the liquid in the circulating water tank 1606 is detected by the conductivity detector 33. When the conductivity is greater than 10000uS / cm, the third drain electric valve 1605 is automatically opened through the PLC control module, and automatically controlled under the detection of the liquid level detector 34, and the clean water is automatically replenished. When the conductivity is less than 5000uS / cm, the drainage can be stopped. (b) When the pressure on the first spray pipe 805 or the first spray pipe 805 or the circulating pipe 1607 is greater than 0.05MPa, the PLC control module controls the corresponding spray pump or circulating pump 1601 to stop running, and notifies the operator to check whether the nozzle is blocked. (c) After the mist is removed by the demister 23, the humidity reaches the standard and then enters the chemical filter box. When the pressure difference detected by the No. 7 pressure difference detector 3007 at both ends of the demister 23 is ≥800Pa, the cleaning spray of the upper and lower parts of the demister 23 is turned on to keep the pressure difference within 800Pa, so as to ensure the normal operation of the demister 23. (d) As the biofilm in the filler metabolizes and dies, it will enter the circulating water tank 1606 and the sewage tank 27, increasing the amount of sludge. In order to keep the circulating water tank 1606 and the sewage tank 27 relatively clean, the third drainage electric valve 1605 and the sewage electric valve 28 are opened every 10-15 days, so that the circulating water tank 1606 discharges continuously for about 5 minutes each time, and the sewage tank 27 discharges continuously for about 2-4 minutes each time. (e) The relative humidity of the exhaust gas should be controlled within the range of 95-100%. If the humidity detected by the humidity detector 31 does not meet the requirements, the humidification electric valve 24 is opened to ensure that the humidity is within the required range. (f) When the water temperature in the circulating water tank 1606 is lower than 20°C, the heating coil starts to work. When the water temperature in the circulating water tank 1606 is higher than 30°C, the heating coil is turned off to ensure that the growth temperature of the microorganisms in the polymer biological filler is within the optimal range of 20-30°C.

[0034] Because those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from its own spirit or scope. Although the implementation cases of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A combined step-coupling deodorizing device, characterized in that: It comprises a washing tower, a bio-trickling filter tower and a filtering tower connected in sequence, wherein a vertical partition is provided in the washing tower, and the two sides of the vertical partition are respectively a primary washing area and a secondary washing area; a flow opening is provided in the middle and lower part of the vertical partition, and the flow opening connects the primary washing area with the secondary washing area; The first washing area and the second washing area are respectively provided with a first spray assembly and a second spray assembly, the first washing area is provided with a polymer corrugated folded plate, and the secondary washing area is provided with a washing area polymer filler assembly and an oil removal filter in sequence from bottom to top; The biological trickling filter tower is provided with a plurality of trickling filter zone polymer biological filler components and circulating water components; The filter tower is provided with a plurality of filter units; A first air inlet is provided at the top of the primary washing area, a first air outlet is provided at the top of the secondary washing area, a second air inlet is provided at the bottom of the bio-trickling filter and a second air outlet is provided at the top, a third air inlet is provided at the bottom of the filter tower and a third air outlet is provided at the top, the exhaust gas enters the washing tower from the first air inlet, passes through the washing tower, the bio-trickling filter and the filter tower in sequence, and is finally discharged from the third air outlet; Also included is a control system, which includes a detection module and a control module; The first spray assembly comprises a first spray water tank, the first spray water tank is connected to a first nozzle assembly via a first spray pipe, the first nozzle assembly is arranged at the top of the primary washing area, and the first spray water tank is connected to a sodium hydroxide dosing device; The second spray assembly includes a second spray water tank, the second spray water tank is connected to a second nozzle assembly via a second spray pipe, the second nozzle assembly is arranged on the upper part of the polymer filler assembly, and the second spray water tank is connected to a sodium hypochlorite dosing device; The vertical partition is arranged on the upper part of the first spray water tank and the second spray water tank. A transverse partition is also arranged above the first spray water tank. The inclination angle of the transverse partition is 30°-40°. A conical separation plate is also arranged on the upper part of the second spray water tank. The circulating water assembly includes a circulating water tank, the circulating water tank is connected to a third nozzle assembly through a circulating pipe, and the third nozzle assembly is arranged on the top of the plurality of dripping zone polymer biological filler assemblies; the circulating water tank is connected to a sodium hydroxide dosing device and a nutrient solution dosing device; The second spray assembly and the third nozzle assembly are spiral nozzles; The first nozzle assembly includes a first resonance chamber and a second resonance chamber which are sequentially distributed up and down, and the first resonance chamber and the second resonance chamber are separated by a Venturi narrow opening; the first nozzle assembly also includes a washing liquid distribution pipe and a compressed gas inlet pipe arranged at the upper part of the first resonance chamber, and the washing liquid distribution pipe is connected to the first spray water tank; the first nozzle assembly also includes a washing liquid nozzle, and the washing liquid nozzle is arranged at the lower part of the second resonance chamber.

2. The combined step-coupling deodorizing device according to claim 1, characterized in that: The washing zone polymer filler assembly includes a first polymer filler module and a second polymer filler module; the second nozzle assembly includes a first spray branch and a second spray branch; the first spray branch is arranged on the upper part of the first polymer filler module, and the second spray branch is arranged on the upper part of the second polymer filler module; The dripping zone polymer biological filler assembly includes a No. 1 polymer biological filler module and a No. 2 polymer biological filler module; the third nozzle assembly includes a No. 1 spray branch and a No. 2 spray branch; the No. 1 spray branch is arranged on the upper part of the No. 1 polymer biological filler module, and the No. 2 spray branch is arranged on the upper part of the No. 2 polymer biological filler module.

3. The combined step-coupling deodorizing device according to claim 1 is characterized in that: The plurality of filter units include a chemical filter component and an inorganic biological filler component which are sequentially arranged up and down; The chemical filtration component is provided with a primary gas phase chemical filter material, a secondary gas phase chemical filter material and a medium efficiency filter in sequence from the outside to the inside; the chemical filtration component is provided with a medium efficiency filter loading and unloading port, a chemical filter material feeding port and a chemical filter material unloading port, and the medium efficiency filter is installed into the chemical filtration component through the medium efficiency filter loading and unloading port; The inorganic biological filler component comprises a hydrophobic inorganic substance module, a nutrient substance module and a microorganism module.

4. The combined step-coupling deodorizing device according to claim 3 is characterized in that: The first spray water tank is also connected to a first water replenishment electric valve and a first drainage electric valve; the first spray pipe is provided with a first spray pump; the second spray water tank is also connected to a second water replenishment electric valve and a second drainage electric valve; the second spray pipe is provided with a second spray pump; The circulating water tank is also connected to a third water replenishment electric valve, a third drainage electric valve and a heating device; the circulating pipe is provided with a circulating pump; A humidification pipeline is also arranged on the upper part of the inorganic biological filler component, and humidification nozzles are evenly distributed on the humidification pipeline; A sewage tank is arranged at the bottom of the filtering tower, and a sewage discharge electric valve is connected to the sewage tank.

5. The combined step-coupling deodorizing device according to claim 4 is characterized in that: The filtration tower is also provided with a demister, which is arranged between the chemical filtration component and the inorganic biological filler component; The air inlet end and the air outlet end of the demister are respectively provided with spray cleaning pipes, and cleaning spray heads are evenly distributed on the spray cleaning pipes.

6. The combined step-coupling deodorizing device according to claim 5, characterized in that: The detection module includes a hydrogen sulfide detector, a non-methane total hydrocarbon detector, a residual chlorine detector, a pH detector, a temperature detector, a humidity detector, a conductivity detector, a liquid level detector, a pressure detector and a differential pressure detector; The hydrogen sulfide detector and the non-methane total hydrocarbon detector are arranged on the third gas outlet; The first spray water tank is provided with the pH detector, the conductivity detector and the liquid level detector, the second spray water tank is provided with the residual chlorine detector, the conductivity detector and the liquid level detector, and the circulating water tank is provided with the pH detector, the conductivity detector, the temperature detector and the liquid level detector; The first pressure detector is arranged on the first spray pipe; the second pressure detector is arranged on the circulation pipe; The humidity detector is arranged between the humidification pipeline and the inorganic biological filler component.

7. A combined step-coupling deodorization method, using the combined step-coupling deodorization device according to any one of claims 1 to 6, characterized in that: The steps include: S1, start the sodium hydroxide dosing device, the nutrient solution dosing device and the sodium hypochlorite dosing device; start the first spray assembly and the second spray assembly to spray the washing tower, and start the circulating water assembly to spray the polymer biological filler assembly in the trickling filter area; S2, turning on the centrifugal fan, and the exhaust gas passes through the washing tower, the biotrickling filter tower and the filter tower in sequence; The method further includes a control process: detecting a target value through the detection module, and controlling the first spray component, the second spray component and the circulating water component through the control module.

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