CN1583228A - Biological filtering method for converting nitrogen oxide gas into nitrogen under aerobic environment - Google Patents
Biological filtering method for converting nitrogen oxide gas into nitrogen under aerobic environment Download PDFInfo
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- CN1583228A CN1583228A CNA200410027319XA CN200410027319A CN1583228A CN 1583228 A CN1583228 A CN 1583228A CN A200410027319X A CNA200410027319X A CN A200410027319XA CN 200410027319 A CN200410027319 A CN 200410027319A CN 1583228 A CN1583228 A CN 1583228A
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Abstract
A biofiltering method for converting the NOx contained gas to N2 in oxygen environment includes such steps as washing said gas, filtering in a biofiltering tower containing filler, nitrifying bacteria and denitrifying bacteria while removing NO under the action of said bacteria, regenerating denitrifying bacteria, and deoxygenating the circulating liquid used in biofiltering tower.
Description
Technical field
The present invention relates to air environmental pollution improvement, biofiltration and environmental pollution treatment technology field, be meant that specifically nitrogen oxidizing gas under a kind of aerobic environment is converted into the biologic filtration method of nitrogen.
Background technology
The human annual movable nitrogen oxide (NO that produces
x), comprise NO, NO
2, N
2O etc. are above 100,000,000 tons.In recent years, the generated energy of China is with the speed increment in every year average 10%, and gross generation in 2000 reaches 1.1 hundred million kilowatt hours, wherein, coal fired power generation accounts for 75% of gross generation, and Power of State system direct-furnish electrical network accumulative total consumes the coal annual and surpasses 2.4 hundred million tons, discharging NO
xUp to ten million ton, wherein about 95% be NO.Because anthropogenic discharge's NO
xThe concentration height, emission point is concentrated, and the harm that causes is also just bigger.A large amount of nitrogen oxide is one of principal element that causes acid rain and photochemical fog, serious threat natural environment and human beings'health.In recent years, national governments and enterprise have taked certain measure, and the atmosphere pollution situation of some major industrial countries generally speaking develops toward the good aspect, and major pollutants concentration such as sulfur dioxide, carbon monoxide and flue dust decrease.But owing to lack effective control device, NO
xConcentration still have overall ascendant trend, therefore, also more and more stricter to the restriction of its discharging.To the emission control of nitrogen oxide in the coal combustion exhaust and the research of transformation mechanism thereof, become current home and abroad hot issue.
The control method of NO is controlled and two kinds of the back controls of burning before mainly containing burning in the coal combustion exhaust.Control mainly is by improving the generation that fired state and fuel denitrogenation reduce nitrogen oxide before the burning, as the use of boiler for low nitrogen oxide etc.; But because some control combustion process NO
xThe technology that generates often reduces the thermal efficiency, and incomplete combustion loss increases, and equipment scale also increases thereupon, and NO
xReduction limited, therefore, do not reach the practical stage at present comprehensively.The control of burning back mainly is to adopt the selective catalytic reduction method of NO and biological denitrification method etc.Wherein, SCR is a control NO method after a kind of burning of extensive use, but because there are the following problems, the drawback that causes catalysis method to have to be difficult to remove: 1. catalyst poisoning, forfeiture reactivity; 2. ammonia remains in the reactor, forms sulfate occluding devices such as sulfate of ammoniac; 3. adopting carbon monoxide is catalyst, can reduce the thermal efficiency equally.Biofiltration process just comes into one's own since the sixties in 20th century abroad as a kind of emission control technology, and the equipment scale that it has solved said method substantially is big, investment is big, the shortcoming of catalyst poisoning, the reduction thermal efficiency and secondary pollution.
The eighties in 20th century, biologic filtration method is succeedd aspect the improvement of volatile organic matter (VOC) as a kind of emission control technology.This technology capital equipment is a biological filtering tower combined working, and this is the container that a kind of inside is equipped with fixing organic or inorganic packing material usually, constitutes a biological filter system that contains a large amount of microorganisms.At present, this device often is used to contain ethanol, petroleum hydrocarbon and sulfide treatment of waste gas.In this processing procedure, volatile organic waste gas with certain humidity enters the biofilter, packing layer by biologically active, organic pollution is transferred to biosphere from gas phase, thereby being decomposed by microbiological oxidation, is carbon dioxide, water and other end product with wherein organic pollution oxidation Decomposition.Biological filtering tower combined working also has been used to contain the nitrifying process of ammonia gas, and has obtained certain effect.
The home and abroad have many researchers attempt to adopt identical biological filtering tower combined working remove nitrogen oxide in the burnt gas (mainly be NO, NO
2, N
2O etc. account for very little ratio).Under the situation of additional carbon, microorganism carries out the heterotrophism metabolism with nitrogen oxide as nitrogenous source, thereby finishes removing based on the nitrogen oxide of NO.But in actual industrial production, a lot of burnt gas at first wash the discharging that reduces sulfur dioxide and dust by the rinse device, and this operating temperature that washes process is generally 50～60 ℃, and contains 3%～8% oxygen in the gas.As far back as 1998, people have just found the influence of oxygen concentration to this technology NO removal efficiency: under oxygen free condition, the removal efficiency of NO can be up to more than 95% in the burnt gas, oxygen content is 2% o'clock, the removal efficiency of NO sharply reduces, biological filtering tower combined working will just can have a small amount of recovery with 15 days to the remove of NO, when oxygen content reaches 4%, the removal efficiency of NO is reduced to below 15%, and the activity and the quantity of denitrifying bacterium can't be recovered in experimentation, illustrates that there is toxic action in the existence of oxygen to denitrifying bacterium.Therefore, the improvement that is used for coal combustion exhaust of this biologic filtration method also needs the problem of the most critical that solves: the rapid inactivation of denitrifying bacterium, NO removal efficiency reduced significantly when waste gas contained high concentration oxygen and exists.
Existing research mostly adopts the approach of single heterotrophism anaerobic denitrifying to remove nitrogen oxides from exhaust gas, promptly under the additional carbon situation, denitrifying bacterium utilizes carbon source as electron donor, and nitrogen oxide is accepted electronics and is reduced to end product nitrogen under the effect of biology enzyme.It is the inhibition of oxygen above-mentioned that there is topmost problem in this approach.Have the only a few researcher to attempt to adopt the opposite approach of single autotrophy nitration oxidation, nitrogen oxide is oxidized and dissolve in the aqueous solution, forms NO
3, NO
2Thereby, reach the purpose of nitrogen emission.This approach is just transferred to pollutant in the aqueous solution with another kind of form, also needs post processing just can reach environmental requirement.
It is microbe carrier that the prior biological filtering technique generally adopts compost, rock particles and polymer etc., and compost has pH value stabilization, growth of microorganism is easy, performance of keeping humidity is good advantage, but gas is very big by the resistance of filler; Though resistance is little when being bio-carrier with rock type such as slag, perlites, performance of keeping humidity is poor; General polymer class filler moisture retention is poor, and biofilm is difficult.And the industrial smoke flow is big, and outlet pressure is little, and it is huge that the equipment of biofiltration can appear in existing biotechnology, take up an area of wide, the deficiency that energy consumption is big.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, provides nitrogen oxidizing gas under a kind of aerobic environment to be converted into the biologic filtration method of nitrogen.This method has overcome the inhibition problem of oxygen, can remove nitrogen oxides from exhaust gas under aerobic conditions, and removal efficiency reaches more than 90%, and gas resistance when the biological filtering tower combined working is little, and the time of staying is short.
The present invention realizes by following technical solution: wash the waste gas of nitrogen-containing oxide in the rinse device, remove the cigarette ash in the waste gas, increase airflow humidity simultaneously, the waste gas after washing enters in the biological filtering tower combined working that filler is housed and filters; Described waste gas and circulation fluid in biological filtering tower combined working adverse current or and stream contact, under the synergy of nitrifier and denitrifying bacterium, finish removing of NO; Described biological filtering tower combined working also is communicated with denitrifying bacterium active regeneration device, behind the circulation fluid process NO subtractive process, enters denitrifying bacterium active regeneration device, and circulation fluid is by deoxidation gas, and microorganism obtains upgrading simultaneously, reenters biological filtering tower combined working then.
In order to realize the present invention better, described denitrifying bacterium active regeneration device is a constant-temperature enclosed container, remain on the atmospheric pressure state of 0.10～1.00atm, and have the going into of circulation fluid, outlet and discard solution discharge port, bleeding point and nutrient solution and add mouth, also be installed with agitator; Filler in the described biological filtering tower combined working is a bioceramic, and its basic parameter is: particle diameter 5～8mm, proportion 1.0 ± 0.2, porosity 50 ± 5%, specific area 200～300m
2/ m
3Described circulation fluid improves carbon source concentration and salinity according to the load that removes of NO in waste gas during NO concentration＞0.5mg/l, increases carbon source (i.e. (CH by adding glucose, gravy or methyl alcohol nutrient solution
2O)
n) concentration, adding NaCl increases salinity, make carbon source, NaCl, reach (CH with NO load mass ratio
2O)
n: NaCl: NO=5～11: 6～11: 1, add Fe-EDTA 50 ± 2mg, L-cysteine 10 ± 1mg again as promoter in every liter of nutrient solution.
The present invention compared with prior art has following advantage and beneficial effect:
1. the present invention is owing to adopt simple biological filtering tower combined working device, and filler all is less expensive material, so technological operation is simple, and with low cost, pollution-free, processing cost greatly reduces than prior art.
2. the present invention is when handling nitrogen oxides from exhaust gas, and single treatment can be finished, and need not after-treatment.
3. the present invention has adopted composite microbial objects system and denitrifying bacterium regenerating unit, reproduction speed and the activity of denitrifying bacteria have been improved, overcome the inhibition of oxygen, so be applicable to removing of nitrogen oxide in the industrial waste gas, removal efficiency reaches more than 90%, and resistance was little when gas passed through biological filtering tower combined working, and the time of staying is short.
Description of drawings
Fig. 1 is a system architecture schematic diagram of the present invention;
Fig. 2 is the structural representation of denitrifying bacterium active regeneration device among the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is done detailed description further.
As shown in Figure 1, the waste gas of nitrogen-containing oxide is removed the cigarette ash in the waste gas earlier through rinse device 2, increases airflow humidity simultaneously; Waste gas after the rinse feeds and is equipped with in the biological filtering tower combined working 1 of filler, waste gas and circulation fluid in biological filtering tower combined working 1 adverse current or and flow and contact, finish removing of NO, afterwards emptying.Carrier in the biological filtering tower combined working 1 can be one deck, also can be multilayer, and its surface is formed with certain thickness biomembrane with a large amount of microorganisms, and biomembrane is the main place that NO removes reaction.Behind the circulation fluid process NO subtractive process, enter denitrifying bacterium active regeneration device 3.
As shown in Figure 2, denitrifying bacterium active regeneration device 3 is constant-temperature enclosed containers, have circulation fluid inlet 4, outlet 5 and discard solution discharge port 6, (holding device is under condition of negative pressure for bleeding point 7, remove the dissolved oxygen in the circulation fluid), fresh nutrient solution adds mouthfuls 9, also is installed with agitator 8.This device has improved the reproduction speed and the activity of denitrifying bacterium well, and the inhibition that the biological denitrification process of waste gas is overcome oxygen plays a part crucial.
In the present invention, the microorganism in the biological filtering tower combined working is a compound system, exists heterotroph denitrifying bacterium, autotrophic type nitrifier, also has other microorganisms.Dissolved oxygen in the autotrophic type nitrifier one side consumable liquid, the part nitrogen oxide in the nitration oxidation gas on the other hand.Denitrifying bacterium is wherein topmost flora, play a crucial role, its except absorb and reducing gas in nitrogen oxide, must reduce the nitration product (NO of nitrogen oxide in the circulation fluid
3 -, NO
2 -).The denitrification of the nitrogen oxide in the relative gas, the NO in the aqueous solution
3 -, NO
2 -Denitrification to remove speed fast.The embodiment of the invention uses the different location to get different microbial bacteria samples, consists predominantly of denitrification Pseudomonas such as false unicellular bacillus (Pseudomonas), thiobacillus denitrificans (Thiobacillus), secondary coccus (Paracoccus), methanogen and the unicellular bacterium of nitrosation (Nitrosomonas), nitrosation coccus (Nitrosococcus), nitrosation spirillum nitrifiers such as (Nitrosospira).Be drawn into biological filtering tower combined working through the bacterium liquid after the enrichment culture, nutrient solution is corresponding to begin circulation (promptly forming circulation fluid).If oxygen concentration is lower than 1% in the waste gas of nitrogen-containing oxide, then in the biological filtering tower combined working a kind of anoxic environment, denitrifying bacterium activity in this environment is very high, and removal efficiency of nitrogen oxides is also very high.Under 3～8% oxygen concentration, the biomembrane shallow-layer of filling surface because and the oxygen full contact, dissolved oxygen concentration is big, forms aerobic zone; Owing to existing resistance to mass tranfer, oxygen presents anaerobic condition than deep layer; Innermost layer is anaerobic or anaerobic zone.NO at first enters aerobic zone after being absorbed by biomembrane, and part NO is become NO by the microorganism nitration oxidation
2 -, NO
3 -, the dissolved oxygen in the aerobic zone is also consumed by aerobic bacteria simultaneously, also has fraction NO to be become N by direct denitrification
2In anoxic and anaerobic zone, NO, NO
2 -, NO
3 -All become end product N by denitrification
2So under the high concentration oxygen condition, nitrification and denitrification is cooperated mutually, make the NO removal efficiency still very high.When oxygen concentration in the waste gas less than 3% the time, the NO removal efficiency rises with oxygen concentration and descends gradually under the same terms; If the oxygen concentration in the waste gas is greater than 5%, along with the increase of oxygen concentration, the removal efficiency of NO presents ascendant trend.If oxygen concentration is greater than 10% in the waste gas, chemical oxidation will take place in the part NO in the nitrogen oxide in gas phase, be oxidized to NO
2, along with the increase of oxygen concentration, NO
2Proportion increases thereupon.Because NO
2More a lot of greatly than NO solubility, and NO
2 -Denitrification is easy many than NO, so the increase of oxygen concentration has improved the nitrogen oxides of exhaust gas removal efficiency on the contrary.
Filling carrier among the present invention in the biological filtering tower combined working is a bioceramic, is piled up by one section or two-part bioceramic filler to form the biofiltration bed.Because the bioceramic specific area is big, and is easy to growth of microorganism, so be formed with the biomembrane of thickness at filling surface.Along with the continuous operation of biofiltration bed, metabolite of microorganism and aging microorganism will inevitably be full of the hole between filler gradually, and final result is the resistance increase that gas passes through filter bed, until obstruction.When increasing considerably appears in upper and lower section pressure reduction of filler, can use normal saline solution backwash filler, because bioceramic density and water are near, filler is in flow regime in filter bed, the foreign material in the filler hole are easy to be cleaned.Microorganism can be discharged organic acid in metabolic process, the organic acid accumulation causes pH to reduce, and influences growth of microorganism.The Main Ingredients and Appearance of bioceramic filler is a carbonate, can play the cushioning effect of nature to pH.The general humidity of industrial waste gas is low, temperature is high, and may contain some materials to microorganism harm, so need washing through the rinse tower before feeding the biofiltration bed.The EGT that washes the back nitrogen-containing oxide is that 40～60 ℃, humidity are 50～70%, and such humidity and temperature are the most favourable to the microorganism in the bacteria bed.Waste gas after washing enters (also can feed from the top) from the bottom of biofiltration bed, during through packing layer, at filling surface generation series of physical chemical change: nitrogen oxide by filler on a large amount of microorganisms that exist absorb, under the catalysis of biology enzyme, be converted into and eco-friendly N
2, discharge from the top of biofiltration bed at last, enter the atmospheric air circulation system.Growth of microorganism removes humidity, and temperature has outside the requirement, also needs indispensable element and trace elements such as Cu, Ni, Zn such as enough carbon sources, nitrogenous source and P, S, Fe, Ca, Mg.Circulation fluid not only provides nutrient for microorganism, and also the transfer for nitrogen oxide provides carrier.The component and the proportioning of nutrient solution (circulation fluid) are as follows: glucose 5 ± 4.5g/l, NaCl 5 ± 4g/l, phosphate buffer pH=6.8～7.2, FeCl
24H
2O 20 ± 2mg/l, MgSO
47H
2O 200 ± 5mg/l, anhydrous CaCl
221.8 ± 2mg/l; Circulation fluid is added NaNO in addition when filler biofilm stage or device idling lotus (not having the waste gas of nitrogen-containing oxide to feed)
30.2 trace element solution 10ml/l such as～0.5g/l and Cu, Zn, Mo.Circulation fluid by denitrifying bacterium active regeneration device add in microorganism system that carbon source (glucose, gravy, methyl alcohol etc.), EDTA are ferrous, L-cysteine, sodium chloride etc., can strengthen the absorptivity of NO.
In the present invention, waste gas total time of staying in the biofiltration bed can be 0.5～3.5min.The time of staying is short more, and the load of bacteria bed is big more, and promptly the amount of removing of nitrogen oxide is big more on unit interval unit's packing volume.But the corresponding reduction of removal efficiency of nitrogen oxides meeting, the outlet nitrous oxides concentration improves.So the time of staying decides according to exhaust-gas treatment amount, bacteria bed disposal ability and discharged nitrous oxides standard.Nitrous oxides concentration in the exhaust gas discharged of less chemical plant (the synthetic factory of nitric acid etc.) is higher, nitrogen oxide mainly is to exist with the NO form in the general boiler waste gas, NO concentration is about 0.15～0.3mg/l, if the time of staying is 0.5min, outlet NO concentration can reach below the 0.04mg/l; If the time of staying extends to 1min, then the NO exit concentration can drop to below the 0.02mg/l; If the time of staying is selected 1.5min, the NO exit concentration will be lower (＜0.01mg/l).
The embodiment of several maturations is provided below:
Embodiment one
Artificial synthetic high concentration nitrous oxides exhaust gas: carrier gas N
2, NO 0.80mg/l, O
23%, CO
218%.The size of biofiltration bed: internal diameter 8cm, long 50cm, upper and lower respectively have a segment length 5cm buffering area.Filler is selected the bioceramic of lightweight for use, specification: Φ 6mm, proportion 1.0 ± 0.2, porosity 0.55, specific area 200m
2/ m
3Compound bacteria is inoculated on the filler, and biofilm is finished after two weeks of circulation.The key component and the proportioning of circulation fluid are as follows: glucose 50mg/l, NaCl 50mg/l, phosphate buffer pH=6.8～7.2, FeCl
24H
2O 20mg/l, MgSO
47H
2O 200mg/l, anhydrous CaCl
221.8mg/l every liter of nutrient solution adds trace element solution 10ml again.Waste gas at first feeds from rinse device bottom, feeds biofiltration bed bottom after collect on the top again.Circulation fluid sprays from biofiltration bed top through distributor, flow 4.2l/h; Be recovered to denitrifying bacterium active regeneration device through the circulation fluid behind the biofiltration bed; Denitrifying bacterium active regeneration device keeps 0.9～1.0atm atmospheric pressure state, and has the going into of circulation fluid, outlet and discard solution discharge port, bleeding point and nutrient solution and add mouth, also is installed with agitator.The operating temperature of biofiltration bed is 50 ℃, gas flow 1l/min, and the NO load of every liter of filler is 0.40mg/min, the time of staying is 1min, exit gas NO concentration 0.084mg/l.
If the NaCl of circulation fluid and concentration of glucose change glucose: NaCl: NO=11 into according to the NO load: 11: 1, be glucose 200mg/l in the circulation fluid, NaCl 200mg/l, every liter of circulation fluid is added Fe-EDTA 50mg, L-cysteine 10mg in addition, and other components are constant fully; Then the NO exit concentration is reduced to 0.064mg/l.
If the NaCl of circulation fluid and concentration of glucose change glucose: NaCl: NO=6 into according to the NO load: 6: 1, be glucose 110mg/l in the circulation fluid, NaCl 110mg/l, every liter of circulation fluid is added Fe-EDTA 50mg, L-cysteine 10mg in addition, and other components are constant fully; Then the NO exit concentration is reduced to 0.072mg/l.
Embodiment two
Artificial synthetic waste gas: carrier gas N
2, NO 0.15mg/l, O
28%, CO
218%.The size of bacteria bed: internal diameter 20cm, long 200cm.Filler is selected the bioceramic of lightweight for use, specification: Φ 6mm, proportion 1.0 ± 0.2, porosity 0.55, specific area 300m
2/ m
3Filler divides two-layer accumulation, the 82cm of lower floor, and upper strata packed height 64cm, the centre is added with distributor.Be inoculated on the filler with the denitrifier after the domestication cultivation, biofilms are finished after two weeks of circulation.Circulation fluid is from adding simultaneously between bacteria bed top and redistributor, and flow is respectively 6.8l/h and 3.2l/h.Behind the circulation fluid process biofiltration bed, be recovered to denitrifying bacterium active regeneration device; Denitrifying bacterium active regeneration device keeps the atmospheric pressure state about 0.5atm, and has the going into of circulation fluid, outlet and discard solution discharge port, bleeding point and fresh nutrient solution and add mouth, also is installed with agitator.The component and the proportioning of the fresh nutrient solution of adding are as follows: glucose 0.5g/l, NaCl 1g/l, phosphate buffer pH=6.8～7.2, FeCl
24H
2O 20mg/l, MgSO
47H
2O200mg/l, anhydrous CaCl
221.8mg/l every liter of nutrient solution also adds trace element solution 10ml in addition.Trace element solution is formed and proportioning (every liter): 2g FeCl
24H
2O, 4.3g Na
2-EDTA, 62mgH
3BO
3, 17mg CuCl
22H
2O, 24mg NiCl
24H
2O, 24mg CoCl
26H
2O, 68mg ZnCl
2, 0.1g MnCl
24H
2O, 24mg NaMoO
42H
2O.Feed from biofiltration bed bottom after the waste gas rinse, with the circulation fluid counter current contacting.Operating temperature is 50 ℃; Gas flow 64l/min; The time of staying is 30s, exit gas NO concentration 0.024mg/l.
Embodiment three
Certain miniature boiler waste gas through Main Ingredients and Appearance after the desulfurization and mean concentration is: N
280%, NO0.25mg/l, O
28.1%, CO
211.2%, SO
20.06mg/l.Waste gas average external volume flow is 1893.4m
3/ h.Adopt the concrete enforcement of the present invention as follows:
The first step according to pending gas flow and waste gas nitrous oxides concentration, is determined the size of bacteria bed.Because waste gas NO concentration is not high, the design time of staying can be for about 30s.According to the factors such as geographical environment at scene, internal diameter 2m, long 10m, effective volume is about 31.4m
3
In second step, select filler.Select the bioceramic of lightweight for use, specification: Φ 5mm, proportion 1.0 ± 0.2, porosity 0.55, specific area 250m
2/ m
3Biofilm adopts the method for filler and nutrient solution Mixed culture, makes the fine filling surface that loads on of microorganism, in the packed tower of packing into afterwards.Filler divides two-layer, upper strata 11.3m, the 20.1m of lower floor.
The key component and the proportioning of circulation fluid are as follows: glucose 0.5g/l, NaCl 1g/l, phosphate buffer pH=6.8～7.2, FeCl
24H
2O 20mg/l, MgSO
47H
2O 200mg/l, anhydrous CaCl
221.8mg/l, also add trace element solution 10ml/l in addition, microelement match: CuCl
22H
2O, Na
2-EDTA 43mg/l, ZnCl
20.68mg/l, MnCl
24H
2O 1mg/l, NiCl
24H
2O0.24mg/l, CoCl
26H
2O 0.24mg/l, H
3BO
30.62mg/l.Circulation fluid is added on cat head and redistributor simultaneously.Flow difference: 500l/h, 410l/h.Circulation fluid after the recovery enters denitrifying bacterium active regeneration device, denitrifying bacterium active regeneration plant bulk: 1.5 * 3.0 * 1.2 (m), vacuum 0.1～0.2atm, 46 ℃ of temperature.
Waste gas enters the rinse device after taking off dirt through desulfurization, and roughly about 50 ℃, medial humidity is 80% to the outlet EGT.Enter the biofiltration bed after the waste gas, operating temperature is 50 ℃; PH is 6.8～7.2.Outlet NO concentration 0.032mg/l, denitrification percent reaches 87.2%, and stable.
Embodiment four
Synthetic factory's discharging waste gas main component of certain nitric acid and mean concentration: N
2O 0.17mg/l, NO 1.24mg/l, NO
21.37mg/l, O
22.8%, N
295%.Because NO in the waste gas
xContent is very high, is emitted on to be yellow in the air, is commonly called as " tobacco ".
Because the nitrous oxides concentration difference is very big, so with embodiment three difference is arranged slightly.Filler is selected the bioceramic of lightweight for use, specification: Φ 8mm, proportion 1.0 ± 0.2, porosity 0.45, specific area 200m
2/ m
3Filling mode adopts the syllogic method, and it is the same to go up two-layer and last example, but followingly also has one short layer, highly is about half of upper strata.Gas feeds between first and second layer (on from descending).The time of staying is long slightly, is 50s.Nutrient solution is added between cat head and packing layer, and flow (from bottom to top) is respectively 1200,640,430l/h.Nutrient composition and last routine basically identical, but increase carbon source concentration and salinity by adding glucose, gravy or methyl alcohol nutrient solution, make CH
2O: NaCl: NO=5: 10: 1, add Fe-EDTA 50mg/l, L-cysteine 10mg/l again.After reclaiming, circulation fluid enters the denitrifying bacterium active regeneration device identical with embodiment three.
Through handling, nitrogen oxide detects in the exit gas: N
2O 0mg/l, NO 0.056mg/l, NO
20mg/l.
As mentioned above, can realize the present invention preferably.
Claims (4)
1. the nitrogen oxidizing gas is converted into the biologic filtration method of nitrogen under the aerobic environment, be included in the waste gas that washes nitrogen-containing oxide in the rinse device, remove the cigarette ash in the waste gas, increase airflow humidity simultaneously, waste gas after washing enters in the biological filtering tower combined working that filler is housed and filters, and it is characterized in that, described waste gas and circulation fluid in biological filtering tower combined working adverse current or and stream contact, under the synergy of nitrifier and denitrifying bacterium, finish removing of NO; Described biological filtering tower combined working also is communicated with denitrifying bacterium active regeneration device, behind the circulation fluid process NO subtractive process, enters denitrifying bacterium active regeneration device, and circulation fluid is by deoxidation gas, and microorganism obtains upgrading simultaneously, reenters biological filtering tower combined working then.
2. the nitrogen oxidizing gas is converted into the biologic filtration method of nitrogen under a kind of aerobic environment according to claim 1, it is characterized in that, described denitrifying bacterium active regeneration device is a constant-temperature enclosed container, remain on the atmospheric pressure state of 0.10～1.00atm, and have the going into of circulation fluid, outlet and discard solution discharge port, bleeding point and fresh nutrient solution and add mouth, also be installed with agitator.
3. the nitrogen oxidizing gas is converted into the biologic filtration method of nitrogen under a kind of aerobic environment according to claim 1, it is characterized in that, filler in the described biological filtering tower combined working is a bioceramic, and its basic parameter is: particle diameter 5～8mm, proportion 1.0 ± 0.2, porosity 50 ± 5%, specific area 200～300m
2/ m
3
4. the nitrogen oxidizing gas is converted into the biologic filtration method of nitrogen under a kind of aerobic environment according to claim 1, it is characterized in that, described circulation fluid is when NO concentration is greater than 0.5mg/l in waste gas, increase carbon source concentration by adding glucose, gravy or methyl alcohol nutrient solution, adding NaCl increases salinity, makes the mass ratio of carbon source, sodium chloride and NO load reach (CH
2O)
n: NaCl: NO=5～11: 6～111, in every liter of nutrient solution, add Fe-EDTA 50 ± 2mg, L-cysteine 10 ± 1mg again as promoter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100369658C (en) * | 2005-10-12 | 2008-02-20 | 浙江工业大学 | Biologically denifrifying treatment method for waste gas containing nitroxide |
| CN102179166A (en) * | 2011-04-08 | 2011-09-14 | 云南大学 | Method for increasing synchronous flue gas desulfuration and denitrification efficiency of bio-membrane packed tower by using external carbon source |
| CN103100293A (en) * | 2011-11-10 | 2013-05-15 | 中国石油化工股份有限公司 | Process method for flue gas denitrification through biological method |
| CN115487666A (en) * | 2022-08-26 | 2022-12-20 | 福州大学 | High-efficiency conversion of NO in flue gas into N 2 Method of O |
-
2004
- 2004-05-26 CN CNB200410027319XA patent/CN1253237C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100369658C (en) * | 2005-10-12 | 2008-02-20 | 浙江工业大学 | Biologically denifrifying treatment method for waste gas containing nitroxide |
| CN102179166A (en) * | 2011-04-08 | 2011-09-14 | 云南大学 | Method for increasing synchronous flue gas desulfuration and denitrification efficiency of bio-membrane packed tower by using external carbon source |
| CN103100293A (en) * | 2011-11-10 | 2013-05-15 | 中国石油化工股份有限公司 | Process method for flue gas denitrification through biological method |
| CN103100293B (en) * | 2011-11-10 | 2015-07-22 | 中国石油化工股份有限公司 | Process method for flue gas denitrification through biological method |
| CN115487666A (en) * | 2022-08-26 | 2022-12-20 | 福州大学 | High-efficiency conversion of NO in flue gas into N 2 Method of O |
| CN115487666B (en) * | 2022-08-26 | 2023-09-12 | 福州大学 | Efficient conversion of NO in flue gas to N 2 O method |
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