CN1351897A - Removing method for foul smell gas - Google Patents
Removing method for foul smell gas Download PDFInfo
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- CN1351897A CN1351897A CN00127427A CN00127427A CN1351897A CN 1351897 A CN1351897 A CN 1351897A CN 00127427 A CN00127427 A CN 00127427A CN 00127427 A CN00127427 A CN 00127427A CN 1351897 A CN1351897 A CN 1351897A
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- gas
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- hydrogen sulfide
- foul gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The present invention relates to biological deodoring process and especially a kind of acidic and neutral two steps, deodoring process. Foul gas is first metabolized biologically to eliminate hydrogen sulfide and at the same time, absorbed chemically to eliminate ammonia and amines by chemical absorption in an acidic reactor; and then metabolized biologically to eliminate organic sulfide and deodored completely in a neutral reactor. The process of the present invention has deodoring capacity three times higher than the existing technology, low investment and operation cost, reasonable technological process and stable effect. The present invention may be used in deodoring various foul odour source, such as sewage pump station, sewage processing plant, domestic garbage treating field, etc..
Description
The present invention relates to the microbial metabolism deodorizing technology of foul gas, especially the odor causing substance among the gas is removed by microbial metabolism, make gas reach the method for odorless.
Can produce the gas that contains odor causing substance, so-called odor pollution that Here it is in the production process of municipal administration such as municipal drainage, rubbish and ight soil processing, organism processing and industrial circle.Stench is not only a kind of sensation and is polluted, and, because odor causing substance has toxic to human body usually, so be actually a kind of polluter that is detrimental to health.
Odor causing substance investigation contained in the foul gas to various sources shows: the most general odorant is respectively that sulphur system and nitrogen are two series.Wherein sulphur system comprises: hydrogen sulfide (H
2S), methyl mercaptan (CH
3SH), methyl sulfide ((CH
3)
2S), dimethyl disulfide ((CH
3)
2S
2); Nitrogen system comprises: ammonia (NH
3), trimethylamine ((NH
2)
3C).Further stench is shared occupation rate and be the analysis showed that, in the stench of most municipal source (Urban Drainage Pumping Stations, municipal sewage plant, rubbish and ight soil terminal and processing field), hydrogen sulfide, methyl sulfide and ammonia have been shared 95%～99% stench intensity, therefore remove the main task that these materials become deodorization.
Up to now, the absorption of the employing Physical Mechanism that the removal of odorant has, the burning of chemism, oxidation, strong basicity (pH) 12) in the liquid and the methods such as microbial metabolism of absorption and biomechanism.Wherein the biological metabolism method is no matter from all having advantage with the security aspect of secondary metabolites economically, is external most widely used method in stenches such as municipal source purify at present.
Hansen, N..Odour ' s biological Option.WQI, No.4:12～14,1998. disclose the two big class practical art forms that realize biological deodorization: biofiltration and biological washing.Biofiltration can be divided into biofilter and two kinds of forms of Biotrickling filter again.Biofiltration: surface or growth inside have the packed bed of the microorganism of tool odorant metabolic activity, and when foul gas passed through bed, odor causing substance contacted with microorganism and is metabolised to the odorless material, reaches the deodorization purpose.The difference of biofilter and Biotrickling filter is that the former biological metabolism environment (moisture, biological nutrients) is the self-holding type of filler substantially; The latter is then by keeping the metabolism environment to the liquid spraying of packing layer regularity.The biofilter is made up of two unit: stuffing washing tower and biological reaction pool, and wherein the active metabolism microbial suspension grows in the liquid phase (normally water) in the biological reaction pool; Liquid phase is sprayed in stuffing washing tower by pumping and contacts with foul gas by tower, odor causing substance mainly with the mass transfer form by gas phase to liquid phase, the liquid-phase reflux that contains odor causing substance is to reaction tank, odor causing substance is finished deodorising process thus by microbial metabolism.
The above-mentioned biofiltration of biofilter and two kinds of forms of Biotrickling filter and the biological deodorization technology of biological washing of comprising all has application at present, common characteristic is that a kind of microbial metabolism environmental condition only is provided, be that the deodorization operation comes down to single stage operation, although some equipment plural serial stage, deodorising process come down to single-stage.Although some equipment plural serial stage in addition, the environmental condition of control is consistent, thus there is no essential difference with the one-level large capacity equipment, or single stage operation.And mainly contain following defective in the above-mentioned biological deodorization process implementing: it is lower that volume is removed load, is index with the sulfide removal, how at 10～50 (g-s/m
3Filler h) level makes deodorization device very huge, has influenced investment economy; Removal effect is stable inadequately, is reflected in the clearance lower (＜90%) to organic sulfur compound (methyl mercaptan, methyl sulfide).
The purpose of this invention is to provide a kind of sulfide that can improve and remove capacity, stablize the organic sulfur compound removal effect, can remove the biological deodorization technology of ammonia and amine odor causing substance simultaneously.
Solution of the present invention is according to the mechanism of metabolism sulfide microorganism is discovered: (optimal pH: sulfur bacteria 1～3) has H a class acidophilia
2The metabolism capacity of S maximum (than the high order of magnitude of neutrophilic sulfur bacteria), but energy metabolism organic sulfur compound not; Simultaneously also find neutrophilia sulfur bacteria energy metabolism organic sulfur compound, but when hydrogen sulfide exists, preferential metabolism hydrogen sulfide, and make metabolic activity instability to other sulfide.So just can be certainly to most of sulfur compound stench, because wherein the content of hydrogen sulfide is than the high approximately order of magnitude of other sulfide, it is the optimization that impossible reach removal capacity and removal effect that a kind of metabolism environment only is provided.
Technical scheme of the present invention is: the first step, foul gas is controlled at 1～3 acid reaction device earlier by pH, utilize the acidophilia sulfur bacteria that the big capacity of hydrogen sulfide is removed ability, remove the hydrogen sulfide in the gas fully, ammonia and the amine (alkaline gas) in the gas is removed by chemical absorbing (neutralization reaction) simultaneously; In second step, it is 6～8 neutral reaction devices that the foul gas that goes out the acid reaction device enters pH again, utilizes the neutrophilia sulfur bacteria to remove organosulfur compound, finally reaches the foul gas removal efficiency greater than 96% the above object.
The present invention has following advantage:
1. owing to utilized the acidophilia sulfur bacteria on the interior microorganism of acid reaction device that the big capacity of hydrogen sulfide is removed ability, make sulfide volume overall in the foul gas remove load and can reach 120～180 (g-s/m
3Reactor h), improved about 3 times, reduced equipment manufacturing cost and volume thus, reduced one-time investment than existing method.
2. remove organosulfur compound by the neutrophilia sulfur bacteria in second step, after first step acidophilia sulfur bacteria has been removed nearly all hydrogen sulfide, the neutrophilia sulfur bacteria is removed the activity of organic sulfur compound and can not disturbed again, thereby ensured and removed sulfur series foul smell gas by using material contained in most of malodor source simultaneously, deodorization validity is guaranteed.
Since in the first step acid reaction device of the present invention pH formed thus and can remove hydrogen sulfide 1～3, again can the nationality neutralization reaction absorb the nitrogen series foul smell gas by using material (ammonia and amine cause sordes) of removing alkalescence, make deodorising effect of the present invention more perfect.
4. being used for by the acidity that chemical absorbing is removed nitrogen series foul smell gas by using material is product sulfuric acid from the hydrogen sulfide metabolism.Both save the material consumption of removing the nitrogen series foul smell gas by using, also removed the needs of further part neutralization from, had the feature of cleaning procedure and comprehensive utilization of resources.
Description of drawings
Fig. 1 is a process flow diagram of the present invention
In conjunction with the accompanying drawings the present invention is described in detail, specifically divides following three kinds of embodiment:
Embodiment 1
A. the cultivation of neutrophilia sulfur bacteria microorganism in acidophilia sulfur bacteria and the neutral reaction device in the acid reaction device
Domestication.
A. at first mix by 1: 3～5 with sewage with the municipal sewage plant excess sludge, then it is pumped in two reactors that building light-weight haydite, porous plastics ball or other non-metallic fillers are housed, circulated 3～5 days, and made filling surface generate certain thickness biomembrane; Then, with blower fan the gas of sulfur-bearing, nitrogen series foul smell gas by using thing is fed two reactors successively, substitute mud and the sewage mixed liquor spray filler that biofilm is used with fresh municipal sewage simultaneously, provide nutrition, also can dispose corresponding nutrient solution spray to the microorganism on the biomembrane.
B. subsequent is the domestication of the microorganism on the biomembrane: foul gas is fed two reactors successively, monitor the concentration of two reactors hydrogen sulfide and organic sulfur compound such as methyl mercaptan in the foul gas respectively, and the pH value of circulated sprinkling liquid, first reactor is because the high easily hydrogen sulfide of degraded of first exposure concentration, microorganism is a sulfate ion with its metabolism at first, thereby the pH of the circulation fluid in this reactor descends gradually until reaching 1～3, kept pH1～3, and finished the domestication task in continuous 2～4 days.And second reactor initial stage owing to being subjected to first reactor pH that circulation fluid appears in lower influence to hydrogen sulfide removal rate phenomenon that descends gradually, when pH is lower than 6, add Na
2CO
3Solution rises to about 8 pH, along with the enhancing of acid reaction device to the metabolic capability of hydrogen sulfide, the concentration that enters the hydrogen sulfide of second reactor will be similar to zero, and the metabolic capability of organic sulfur compound will be strengthened gradually, kept pH6～8 in continuous 15～20 days, finish the domestication task.
B. remove the step of foul gas in two steps: the first step blasts or introduces the acid reaction device with foul gas with blower fan, after the metabolism removal hydrogen sulfide while, alkaline nitrogen series foul smell gas by using material was removed in the absorption of nationality neutralization reaction again, come out to enter the neutral reaction device from the acid reaction device, remove organic sulfur compound at this reactor intracellular metabolite.Control circulated sprinkling liquid pH just can keep stable removal capacity, makes odor destruction rate＞96% of foul gas.
Embodiment 2
A. the cultivation of microorganism:
A. preparation earlier identical two parts with municipal sewage plant excess sludge and municipal sewage by the mixed liquor that mixes at 1: 5, to contain in the air feeding mixed liquor of hydrogen sulfide in the portion therein then, and adopt and intermittently replenish the fresh sewage in city as the nutrition of giving microorganism, the pH that detects mixed liquor is in 1～3 scope, hydrogen sulfide reduced rate in the gas is greater than after 98%, keep operation 5～10 days, promptly finish the incubation of acidophilia microorganism.In centrifuge (separating factor 〉=1500, about 3 minutes of the time of staying), concentrate mixed liquor stand-by.
The air that b. will contain the organic sulfur compound methyl mercaptan in another portion mixed liquor of above-mentioned preparation feeds, and adopts to add Na
2CO
3The method of solution is kept pH in 6～8 scope, comes held stationary with the fresh sewage of mixed liquor and additional city of getting rid of 1/5-1/10 every day simultaneously.When into and out of the organic sulfide substrate concentration reduced rate of mixed liquor greater than 92% after, keep operation 12～17 days, finish the incubation of neutrophilia microorganism.The concentrate microbial that promptly obtains the metabolism organic sulfur compound by above-mentioned method for concentration is ready to use in making microorganism embedding ball.
B. microorganism embedding ball is made
A. respectively with the above-mentioned centrifugal two kinds of microbial suspensions that obtain that concentrate, each adds the gel solution that adds 95 gram water preparations by 5 gram sodium alginates or polyvinyl alcohol, and addition adds by 1: 2 volume ratio and mixes.
B. use liquid constant flow pump (electromagnetic pump, peristaltic pump) draw above-mentioned mix contain the microorganism coagulant liquid, spray into ageing liquid by shower nozzle (aperture is at 1.0～2.0 millimeters) and (as contain 5%CaCl
2The aqueous solution), the bead of the active microorganism that contains acidophilia and neutrophilia sulfur bacteria was made in ageing in 20～24 hours.
C. above-mentioned two kinds of beads are made filler, adorn tower respectively and form acid reaction device and neutral reaction device, and connect it.Remove the step of foul gas in two steps: the first step blasts or introduces the acid reaction device with foul gas with blower fan, after the metabolism removal hydrogen sulfide while, alkaline nitrogen series foul smell gas by using material was removed in the neutralization reaction absorption again, come out to enter the neutral reaction device from the acid reaction device, remove organic sulfur compound at this reactor intracellular metabolite.The pH of control circulated sprinkling liquid just can keep stable removal capacity, makes odor destruction rate＞96% of foul gas.
Embodiment 3
A. microbial acclimation
A. at first, prepare two reactors that are connected in series, filling chemical industry dry load is as nonmetallic Raschig ring, Pall ring etc.After mixing by 1: 5 with municipal sewage plant excess sludge and municipal sewage then, pump into above-mentioned two reactors and circulate.Then foul gas is sent into first reactor (air blast or air inducing) by blower fan, come out to enter again second reactor from first reactor, detect two reactors hydrogen sulfide and organic sulfur compound content in the gas respectively, and the pH value of mixed liquor.
B. follow, first reactor is owing to the high easily hydrogen sulfide of degraded of first exposure concentration, and microorganism is a sulfate ion with its metabolism at first, thereby the pH of the circulation fluid in this reactor descends gradually until reaching 1～3, kept pH1～3, and finished and tame into the acid reaction device in continuous 2～4 days.And second reactor initial stage owing to being subjected to first reactor pH that circulation fluid appears in lower influence to hydrogen sulfide removal rate phenomenon that descends gradually, when pH is lower than 6, add Na
2CO
3Solution, pH is risen to about 8, along with of the enhancing of acid reaction device to the metabolic capability of hydrogen sulfide, the concentration that enters the hydrogen sulfide of second reactor will be similar to zero, and the metabolic capability of organic sulfur compound will be strengthened gradually, kept pH6～8 in continuous 15～20 days, finish and tame into neutral reaction and have a high regard for affair.The active microorganism of taming in the acid reaction device is an acidophilia sulfur bacteria group, and the active microorganism of taming in the neutral reaction device is a neutrophilia sulfur bacteria group.
B. last, hydrogen sulfide removal rate＞98% in the gas that the acid reaction device comes out, organic sulfur compound clearance＞92% from the gas that neutral reactor comes out o'clock, can normally remove foul gas in two steps: the first step blasts or introduces the acid reaction device with foul gas with blower fan, after the metabolism removal hydrogen sulfide while, alkaline nitrogen series foul smell gas by using material was removed in the neutralization reaction absorption again, come out to enter the neutral reaction device from the acid reaction device, remove organic sulfur compound at this reactor intracellular metabolite.The pH of control circulated sprinkling liquid just can keep stable removal capacity, makes odor destruction rate＞96% of foul gas.
The present invention can be applicable to the deodorization of various malodor source, most typically is: sewage pumping station, sewage treatment plant, domestic waste transfer station, domestic waste disposal site, fish products processing factory and meat-packing plant etc.
Claims (3)
1. the removal methods of a foul gas, it is characterized in that: two steps of branch that remove of foul gas carry out, the first step is the acid reaction device that foul gas is fed pH=1～3, utilize the acidophilia sulfur bacteria in the acid reaction device that the big capacity of the hydrogen sulfide in the foul gas is removed ability, hydrogen sulfide is removed in metabolism, removes ammonia and amine with chemical absorbing simultaneously; Second step was the neutral reaction device that acid reaction device gas enters pH=6～8, in the neutral reaction device, utilize the metabolism of neutrophilia sulfur bacteria to remove other organic sulfur compound odor causing substances, overall sulfide volume is removed load 120～180 (g-s/m in the control foul gas
3Reactor h) can make the foul gas removal efficiency greater than more than 96%.
2. the removal methods of a kind of foul gas according to claim 1, it is characterized in that: acidophilia sulfur bacteria microorganism and neutrophilia sulfur bacteria microorganism can obtain by cultivating domestication: at first mix by 1: 3～5 with sewage with the municipal sewage plant excess sludge, then it is pumped in the reactor of two series connection that building light-weight haydite, porous plastics ball or other non-metallic fillers are housed, circulated 3～5 days, and made filling surface generate certain thickness biomembrane; Then, sulfur-bearing, nitrogen series foul smell gas by using gas are fed two reactors, substitute mud and the sewage mixed liquor spray filler that biofilm is used with fresh municipal sewage simultaneously, provide nutrition, also can dispose corresponding nutrient solution spray to the microorganism on the biomembrane with blower fan; Monitor hydrogen sulfide and the clearance of organic sulfur compound and the pH value of circulated sprinkling liquid in the foul gas of two reactors respectively, the pH of first reactor cycles liquid drops to 1～3, keeps, and finishes domestication in continuous 2～4 days; Second reactor pH is lower than at 6 o'clock and adds Na
2CO
3Solution makes pH keep 6～8, continuous 15～20 days, finishes the domestication task.
3. the removal methods of a kind of foul gas according to claim 1, it is characterized in that: acidophilia sulfur bacteria microorganism also can be made into microorganism embedding ball with neutrophilia sulfur bacteria microorganism: the mixed liquor of preparing two parts of identical municipal sewage plant excess sludge/municipal sewage=1/5, the air that will contain hydrogen sulfide then therein in the portion feeds, and adopt the fresh sewage in intermittently additional city to give microbial nutrition as circulated sprinkling liquid, the pH that detects mixed liquor is in 1～3 scope, the hydrogen sulfide reduced rate of gas is greater than after 98%, keep operation 5～10 days, finish the cultivation of acidophilia microorganism; The gas that to remove hydrogen sulfide but contain organic sulfur compound in another portion mixed liquor feeds, and adds Na
2CO
3Solution is kept pH=6～8, when into and out of the organic sulfur compound clearance of mixed liquor greater than 92% after, keep operation 12～17 days, finish the incubation of neutrophilia sulfur bacteria microorganism; Respectively above-mentioned medium centrifugal is concentrated in two kinds of microbial suspensions that obtain, each adds the sodium alginate or the polyvinyl alcohol gel aqueous solution, mixes by 1: 2 volume ratio; Draw the above-mentioned coagulant liquid that mixes with the liquid constant flow pump, splash into by shower nozzle and contain 5%CaCl
2The aqueous solution be ageing liquid, the active microorganism bead that contains acidophilia and neutrophilia sulfur bacteria was made in ageing in 20～24 hours, two reactors of packing.
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|---|---|---|---|
| CN00127427A CN1116093C (en) | 2000-11-14 | 2000-11-14 | Removing method for foul smell gas |
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|---|---|---|---|
| CN00127427A CN1116093C (en) | 2000-11-14 | 2000-11-14 | Removing method for foul smell gas |
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| CN1351897A true CN1351897A (en) | 2002-06-05 |
| CN1116093C CN1116093C (en) | 2003-07-30 |
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| CN00127427A Expired - Fee Related CN1116093C (en) | 2000-11-14 | 2000-11-14 | Removing method for foul smell gas |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355486C (en) * | 2006-06-09 | 2007-12-19 | 哈尔滨三元水工业科技发展有限责任公司 | Toxic harmful exhaust gas treatment method and device therefor |
| CN101732937A (en) * | 2010-01-05 | 2010-06-16 | 李兴 | Treatment method of odor in tail gas generated by desiccation, carbonization or burning of city sludge and domestic waste |
| CN102000497A (en) * | 2010-10-25 | 2011-04-06 | 武汉正清和环保科技开发有限公司 | Thiophilic bacteria bio-enzyme deodorization method and application thereof |
| CN102029107A (en) * | 2010-10-26 | 2011-04-27 | 陕西科技大学 | Method for processing leather-making malodorous gas by biological filter |
| CN101234280B (en) * | 2007-11-07 | 2011-07-20 | 中山大学 | Absorption-biological treatment method for malodorous gas |
| FR2969010A1 (en) * | 2010-12-15 | 2012-06-22 | Degremont | Method for eliminating hydrogen sulfide and e.g. methylmercaptan from air in e.g. plant waste treating installation, involves enables biofilters to function at specific pH values to treat respective hydrogen sulfide and sulfurated compound |
| CN102580521A (en) * | 2012-03-26 | 2012-07-18 | 湖南农业大学 | Method for removing hydrogen sulfide gas by utilizing biological active carbon fiber |
| CN103480240A (en) * | 2013-08-23 | 2014-01-01 | 宁夏宝塔石化科技实业发展有限公司 | Foul gas collection purification process for sewage farm |
| CN105935551A (en) * | 2015-12-30 | 2016-09-14 | 江苏科威环保技术有限公司 | Two-stage biological process waste gas treatment system |
| CN108404619A (en) * | 2018-03-09 | 2018-08-17 | 北京工业大学 | Except sulfide hydrogen and volatile organic matter mixed gas two-stage reactor tandem process |
| CN108751395A (en) * | 2018-06-01 | 2018-11-06 | 北京工业大学 | The method of the vulcanisation hydrogen of two-stage and volatile organic matter coupling aerobic denitrification advanced nitrogen |
| CN111282987A (en) * | 2020-02-28 | 2020-06-16 | 中科鼎实环境工程有限公司 | Inhibitor for treating peculiar smell of polluted soil and treatment method thereof |
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| CN1329314C (en) * | 2004-02-05 | 2007-08-01 | 哈尔滨工业大学 | Multipurpose bio-trickling filter deordorization device |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355486C (en) * | 2006-06-09 | 2007-12-19 | 哈尔滨三元水工业科技发展有限责任公司 | Toxic harmful exhaust gas treatment method and device therefor |
| CN101234280B (en) * | 2007-11-07 | 2011-07-20 | 中山大学 | Absorption-biological treatment method for malodorous gas |
| CN101732937A (en) * | 2010-01-05 | 2010-06-16 | 李兴 | Treatment method of odor in tail gas generated by desiccation, carbonization or burning of city sludge and domestic waste |
| CN102000497B (en) * | 2010-10-25 | 2013-03-13 | 武汉正清和环保科技开发有限公司 | Thiophilic bacteria bio-enzyme deodorization method and application thereof |
| CN102000497A (en) * | 2010-10-25 | 2011-04-06 | 武汉正清和环保科技开发有限公司 | Thiophilic bacteria bio-enzyme deodorization method and application thereof |
| CN102029107A (en) * | 2010-10-26 | 2011-04-27 | 陕西科技大学 | Method for processing leather-making malodorous gas by biological filter |
| CN102029107B (en) * | 2010-10-26 | 2013-02-13 | 陕西科技大学 | Method for processing leather-making malodorous gas by biological filter |
| FR2969010A1 (en) * | 2010-12-15 | 2012-06-22 | Degremont | Method for eliminating hydrogen sulfide and e.g. methylmercaptan from air in e.g. plant waste treating installation, involves enables biofilters to function at specific pH values to treat respective hydrogen sulfide and sulfurated compound |
| CN102580521A (en) * | 2012-03-26 | 2012-07-18 | 湖南农业大学 | Method for removing hydrogen sulfide gas by utilizing biological active carbon fiber |
| CN102580521B (en) * | 2012-03-26 | 2013-12-25 | 湖南农业大学 | Method for removing hydrogen sulfide gas by utilizing biological active carbon fiber |
| CN103480240A (en) * | 2013-08-23 | 2014-01-01 | 宁夏宝塔石化科技实业发展有限公司 | Foul gas collection purification process for sewage farm |
| CN103480240B (en) * | 2013-08-23 | 2015-07-01 | 宁夏宝塔石化科技实业发展有限公司 | Foul gas collection purification process for sewage farm |
| CN105935551A (en) * | 2015-12-30 | 2016-09-14 | 江苏科威环保技术有限公司 | Two-stage biological process waste gas treatment system |
| CN108404619A (en) * | 2018-03-09 | 2018-08-17 | 北京工业大学 | Except sulfide hydrogen and volatile organic matter mixed gas two-stage reactor tandem process |
| CN108751395A (en) * | 2018-06-01 | 2018-11-06 | 北京工业大学 | The method of the vulcanisation hydrogen of two-stage and volatile organic matter coupling aerobic denitrification advanced nitrogen |
| CN111282987A (en) * | 2020-02-28 | 2020-06-16 | 中科鼎实环境工程有限公司 | Inhibitor for treating peculiar smell of polluted soil and treatment method thereof |
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|---|---|
| CN1116093C (en) | 2003-07-30 |
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Granted publication date: 20030730 Termination date: 20111114 |