CN102078762A - Nitrite wastewater denitrification process after wet denitration - Google Patents
Nitrite wastewater denitrification process after wet denitration Download PDFInfo
- Publication number
- CN102078762A CN102078762A CN 201010603906 CN201010603906A CN102078762A CN 102078762 A CN102078762 A CN 102078762A CN 201010603906 CN201010603906 CN 201010603906 CN 201010603906 A CN201010603906 A CN 201010603906A CN 102078762 A CN102078762 A CN 102078762A
- Authority
- CN
- China
- Prior art keywords
- nitrite
- waste water
- denitration
- wastewater
- wet method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 79
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 33
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 22
- 230000023556 desulfurization Effects 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims abstract description 6
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000006479 redox reaction Methods 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims description 23
- 239000002250 absorbent Substances 0.000 claims description 16
- 230000002745 absorbent Effects 0.000 claims description 16
- 238000005516 engineering process Methods 0.000 claims description 15
- 239000003546 flue gas Substances 0.000 claims description 13
- -1 sulfate radical Chemical class 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 claims description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000010808 liquid waste Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 claims 3
- 150000002823 nitrates Chemical class 0.000 claims 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims 1
- 159000000007 calcium salts Chemical class 0.000 claims 1
- 235000011164 potassium chloride Nutrition 0.000 claims 1
- 239000001103 potassium chloride Substances 0.000 claims 1
- 159000000000 sodium salts Chemical group 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 8
- 235000010265 sodium sulphite Nutrition 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 229940072033 potash Drugs 0.000 description 3
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 3
- 235000015320 potassium carbonate Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- 229940005654 nitrite ion Drugs 0.000 description 2
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 description 2
- 235000010289 potassium nitrite Nutrition 0.000 description 2
- 239000004304 potassium nitrite Substances 0.000 description 2
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 description 2
- 235000019252 potassium sulphite Nutrition 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011953 bioanalysis Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XGZRAKBCYZIBKP-UHFFFAOYSA-L disodium;dihydroxide Chemical compound [OH-].[OH-].[Na+].[Na+] XGZRAKBCYZIBKP-UHFFFAOYSA-L 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 208000005135 methemoglobinemia Diseases 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- XKLJHFLUAHKGGU-UHFFFAOYSA-N nitrous amide Chemical compound ON=N XKLJHFLUAHKGGU-UHFFFAOYSA-N 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Images
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a nitrite wastewater denitrification process after wet denitration. The process comprises the following steps of: (1) performing the wet denitration on smoke which is subjected to dust removal, wet desulfurization and nitrogen oxide oxidization, and repeatedly and circularly absorbing nitrogen oxide and nitrogen dioxide by using an absorbing liquid to form nitrite denitrated wastewater; and (2) introducing sulfite desulfurized wastewater formed by the wet desulfurization and the nitrite denitrated wastewater into a wastewater treatment tank, controlling the molar ratio of sulfite to nitrite to be between 1.0 and 2.0, adjusting the pH value to be between 3.0 and 6.0, controlling the reaction temperature to be between 30 and 70 DEG C, performing redox reaction to remove the nitrite from the wastewater and then discharging. In the process, the sulfite in the desulfurized wastewater is used as a reagent, and the nitrite is reduced into nitrogen through reaction under a mild condition, so that the nitrite in the denitrated wastewater is efficiently denitrified, and a technical route is provided for recycling the sulfite in the desulfurized wastewater and utilizing sulfate.
Description
Technical field
The present invention relates to the Air Pollution Control field, specifically is the nitrite denitrogenation of waste water technology after a kind of wet method denitration.
Background knowledge
In recent years, along with attention to environment, the technology that removes (denitration technology) of nitrogen oxide becomes the focus of research, " oxidation-absorption " two step denitration technologies (wet method denitration technology) are subjected to researcher's more concern because of its high efficiency and economy, the end-product of absorption liquid is for containing nitrate and nitrite waste water, and the toxicity of nitrite is strong more a lot of than nitrate, nitrite is ingested and forms nitrosamine behind the human body, not only can produce strong " three cause " effect, can also reduce the blood oxygen carrying capacity, cause methemoglobinemia.
In fact, if control oxidizability well, the gained end-product overwhelming majority is a nitrite, publication number is that the Chinese invention patent application of CN101352644 discloses a kind of wet flue gas denitration technique that reclaims nitrite, comprise: adopt hydrogen peroxide or ozone as oxidant, oxidant evenly is ejected in the flue gas after pre-dedusting and desulfurization are handled carries out gas phase oxidation, make the oxidation of nitric oxide in the flue gas generate nitrogen dioxide; Then with alkali lye as absorbent, absorb the mixture of nitric oxide and nitrogen dioxide in the flue gas after peroxidating, generate nitrite; Absorbent behind concentrated absorption nitric oxide and the nitrogen dioxide, crystallisation by cooling obtains the nitrite crystal after the centrifugation.Therefore, the effective problem of handling of the nitrite waste water after the wet method denitration has to be solved.
In the relevant patent of nitrite method of wastewater treatment, most biological denitrificaion methods that adopt, be applicable to the nitrite waste water of low concentration, as: publication number is the Chinese patent of CN1263055, utilizes the bioanalysis denitrogenation to solve the pollution problem of drinking water nitrite preferably; Publication number is the Chinese patent of CN1990853, has introduced a kind of microorganism nitrite degradation agent and preparation method; Publication number is the Chinese patent of CN1800053, has set forth a kind of method of utilizing granule sludge to carry out nitrite denitrification.Generally, adopt chemical method can effectively handle high concentration nitrite waste water, but relevant patent is few in number, as: publication number is the Chinese patent of CN101157508, adopts the method for microwave aid in treatment to realize high concentration nitrite denitrogenation of waste water; Other has publication number is the Chinese patent of CN101481170, is that reagent has been realized in the aquaculture nitrite degradation in the water body with the sulfamic acid; (Ren Xianghong such as Ren Xianghong, Fan Bingan. sulphite is removed the nitrite [J] in the nitro oxidizer waste water. chemistry world, 2000,11:575-581) reported that a kind of is the nitrite waste water treatment process of reagent with the sodium sulfite, effect with efficient denitrification, but required pH value low excessively (pH≤2), this has wasted a large amount of acid reagents, is unfavorable for practical operation.
Summary of the invention
Effectively handle for nitrite waste water after realizing denitration, need further develop or improve some related-art process.The invention provides the nitrite denitrogenation of waste water technology after a kind of wet method denitration, at the nitrite waste water after the wet method denitration, utilize that sulphite is reagent in the desulfurization wastewater, under nearly condition of neutral pH, by the redox denitrification reaction, realized the denitrogenation of nitrite waste water high-efficiency.
Nitrite denitrogenation of waste water technology after a kind of wet method denitration is to the flue gas after process dedusting, wet desulphurization and the nitrogen oxide oxidation processes, handles by following processing step again:
1, wet method denitration
Wet method denitration absorbent is generally NaOH NaOH, sodium carbonate Na
2CO
3, potassium hydroxide KOH, potash K
2CO
3, calcium hydroxide Ca (OH)
2, calcium carbonate CaCO
3And dilute concentration ammoniacal liquor NH
3H
2The aqueous solution such as O, these absorption liquids can absorb nitric oxide and the nitrogen dioxide in the flue gas after peroxidating, generate corresponding nitrate and nitrite, if control oxidizability well, the overwhelming majority is nitrite (Chinese patent CN101352644) in the gained absorption liquid.Because nitrite solubility is all bigger, nitrite can be accumulated to quite high concentration (high concentration nitrite denitration waste water) in the absorption liquid.
2, denitrogenation of waste water
Because the wet desulphurization products therefrom is a sulphite, and calcium sulfite CaSO
3Solubility is very little, therefore in the above-mentioned denitration absorbent, removes calcium hydroxide Ca (OH)
2, calcium carbonate CaCO
3Outward, during as wet desulphurization absorbent, the corresponding sulphite of gained also can be accumulated to quite high concentration (high concentration sulphite desulfurization wastewater) in absorption liquid.
Nitrite waste water and sulphite waste water are introduced in the purification tank for liquid waste, controlled well the two concentration ratio, and regulate pH, redox reaction can take place remove nitrite in the waste water to faintly acid.Related electrode reaction and the standard electrode EMF of nitrite ion and sulfite ion and hydrogen ion generation denitrification reaction mainly comprises in the solution:
Relatively electrode reaction equation (1)～(6) and corresponding electrode electromotive force can be found
Electrode potential apparently higher than
Etc. the oxidation-reduction electrode electromotive force.Obviously, oxidizing electrode
And reducing electrode
Redox reaction very easily takes place, and therefore, denitrification reaction mainly comprises as follows:
Consider in the acid solution simultaneously
Decomposition reaction easily takes place in instability, and products therefrom will further cause a series of new reactions, mainly comprise as follows:
Therefore, by formula (9) reaction, the nitrite anions reduzate is actual to be nitrogen.The inferior sulfate radical reduzate is actual to be sulfate radical.To sum up, the overall budget chemical reaction of nitrite ion and sulfite ion and hydrogen ion generation denitrification reaction mainly comprises:
In above-mentioned steps, reaction temperature is controlled in the 30-70 ℃ of scope, is preferably 40-60 ℃; The mol ratio of inferior sulfate radical and nitrite anions is 1.0-2.0, is preferably between the 1.25-1.75; The pH value of slurries is 3.0-6.0, is preferably between the 4.0-5.5.
3, discharge of wastewater
Nitrite concentration is lower than the discharge standard value in guaranteeing waste water, can directly efflux or enter the circulatory pool recycling.
Sulphite is reagent in the technology utilization desulfurization wastewater of the present invention, under the condition of gentleness (faintly acid, low temperature), redox reaction takes place, and nitrite is reduced to nitrogen, has realized nitrite efficient denitrification in the denitration waste water.Simultaneously, because the end-product of sulfite oxidation is a sulfate, this will provide a technology path for the resource reclaim sulfuric acid salt utilization of sulphite in the waste water after the desulfurization.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
The specific embodiment
As shown in Figure 1, through the NO that contains after dedusting, desulfurization, the oxidation
xFlue gas 1 enters absorption tower 2 and absorbs the back by chimney 8 dischargings.Absorbent 3 adds in the circulatory pool 4 that fills water and is mixed with absorption liquid, is conveyed into the absorption tower by circulating pump 5 and absorbs to enter again and finish one in the circulatory pool and take turns circulation; And so forth, constantly generate nitrite in the absorption liquid; Absorption liquid Central Asia nitrate concentration reaches waste water behind 0.5～5mol/L to be sent in the treatment pond 7 that fills desulfurization wastewater 6 denitrification reaction takes place, and after nitrite has been removed in guaranteeing waste water, can enters circulatory pool 4 recyclings or directly effluxes.
Embodiment 1: utilize the sodium sulfite desulfurization wastewater to handle natrium nitrosum denitration waste water
Flue gas after the oxidation enters the absorption tower, is absorbent with sodium carbonate, and concentration is 15%, and the waste water behind the denitration reaction (the natrium nitrosum denitration waste water of 0.5mol/L) is drained into the treatment pond from the absorption tower, according to the actual concentrations of nitrite anions, presses
The NaOH that mol ratio 1.75 is introduced with concentration 10% is the desulfurization wastewater (sodium sulfite desulfurization wastewater) of absorbent, under 60 ℃ of reaction temperatures, regulate pH to 4.0, nitrite can be realized 100% nitric efficiency in the waste water, and the waste water after the processing returns the circulatory pool recycling.
Embodiment 2: utilize the sodium sulfite desulfurization wastewater to handle potassium nitrite denitration waste water
Flue gas after the oxidation enters the absorption tower, is absorbent with potash, and concentration is 20%, and the waste water behind the denitration reaction (the potassium nitrite denitration waste water of 1.25mol/L) is drained into the treatment pond from the absorption tower, according to the actual concentrations of nitrite anions, presses
The NaOH that mol ratio 1.50 is introduced with concentration 10% is the desulfurization wastewater (sodium sulfite desulfurization wastewater) of absorbent, under 50 ℃ of reaction temperatures, regulates pH to 4.5, and nitrite can be realized 98% nitric efficiency in the waste water.Waste water after the processing returns the circulatory pool recycling.
Embodiment 3: utilize the potassium sulfite desulfurization wastewater to handle ammonium nilrite denitration waste water
Flue gas after the oxidation enters the absorption tower, is absorbent with ammoniacal liquor, and concentration is 10%, and the waste water behind the denitration reaction (the ammonium nilrite denitration waste water of 5.0mol/L) is drained into the treatment pond from the absorption tower, according to the actual concentrations of nitrite anions, presses
The potash that mol ratio 1.50 is introduced with concentration 15% is the desulfurization wastewater (potassium sulfite desulfurization wastewater) of absorbent, under 40 ℃ of reaction temperatures, regulates pH to 5.0, and nitrite can be realized 93% nitric efficiency in the waste water.The nitrite concentration value is very low in the waste water after the processing, but qualified discharge.
Embodiment 4: utilize the ammonium sulfite desulfurization wastewater to handle calcium nitrite denitration waste water
Flue gas after the oxidation enters the absorption tower, is absorbent with calcium hydroxide, and concentration is 10%, and the waste water behind the denitration reaction (0.5mol/L calcium nitrite denitration waste water) is drained into the treatment pond from the absorption tower, according to the actual concentrations of nitrite anions, presses
The ammoniacal liquor that mol ratio 1.25 is introduced with concentration 10% is the desulfurization wastewater (ammonium sulfite desulfurization wastewater) of absorbent, under 40 ℃ of reaction temperatures, regulates pH to 5.5, and nitrite can be realized 85% nitric efficiency in the waste water.The nitrite concentration value is very low in the waste water after the processing, but qualified discharge.
Claims (5)
1. the nitrite denitrogenation of waste water technology after the wet method denitration comprises:
(1) wet method denitration
To carry out the wet method denitration through the flue gas after dedusting, wet desulphurization and the nitrogen oxide oxidation processes.The aqueous solution or dilute concentration ammoniacal liquor that described wet method denitration absorbent is sodium salt, sylvite, calcium salt, the oxidizability of nitrogen oxide in the control flue gas, absorbent circulates repeatedly in denitrating system and absorbs nitric oxide and nitrogen dioxide, make absorption liquid Central Asia nitrates accumulation, form nitrite denitration waste water;
(2) denitrogenation of waste water
Sulphite accumulation in the wet desulphurization absorption liquid, the sulphite desulfurization wastewater that forms, introduce in the purification tank for liquid waste with the nitrite waste water that step (1) forms, the mol ratio of control inferior sulfate radical and nitrite anions is 1.0-2.0, and adjusting pH to 3.0-6.0, reaction temperature is controlled at 30-70 ℃, and redox reaction takes place, and removes in the waste water and discharges behind the nitrite.
2. the nitrite denitrogenation of waste water technology after a kind of wet method denitration as claimed in claim 1 is characterized in that: absorption liquid Central Asia nitrates accumulation is 0.5～5mol/L to concentration in the described step (1).
3. the nitrite denitrogenation of waste water technology after a kind of wet method denitration as claimed in claim 1 is characterized in that: the mol ratio of inferior sulfate radical and nitrite anions is 1.25-1.75 in the described step (2).
4. the nitrite denitrogenation of waste water technology after a kind of wet method denitration as claimed in claim 1 is characterized in that: oxidizing reaction temperature is 40-60 ℃ in the described step (2).
5. the nitrite denitrogenation of waste water technology after a kind of wet method denitration as claimed in claim 1 is characterized in that: the pH value is adjusted to 4.0-5.5 in the described step (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010603906 CN102078762A (en) | 2010-12-22 | 2010-12-22 | Nitrite wastewater denitrification process after wet denitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010603906 CN102078762A (en) | 2010-12-22 | 2010-12-22 | Nitrite wastewater denitrification process after wet denitration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102078762A true CN102078762A (en) | 2011-06-01 |
Family
ID=44085074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010603906 Pending CN102078762A (en) | 2010-12-22 | 2010-12-22 | Nitrite wastewater denitrification process after wet denitration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102078762A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102716648A (en) * | 2012-05-16 | 2012-10-10 | 北京航空航天大学 | Method for automatically controlling desulphurization and denitration by flue gas based on pH value and ORP value and apparatus thereof |
| CN104529012A (en) * | 2015-01-05 | 2015-04-22 | 北京化工大学 | Method for processing nitrite nitrogen in waste water |
| CN105457467A (en) * | 2015-12-31 | 2016-04-06 | 安徽省绿巨人环境技术有限公司 | Flue gas denitration device and method |
| CN105833695A (en) * | 2016-05-03 | 2016-08-10 | 浙江天蓝环保技术股份有限公司 | Device and technology for wet desulfurization and denitrification of flue gas of coal-fired boiler and treatment of wastewater |
| CN106925095A (en) * | 2015-12-31 | 2017-07-07 | 杭州中兵环保股份有限公司 | NO in a kind of denitrating flue gasxChange into N2Apparatus and method |
| CN107737520A (en) * | 2017-10-17 | 2018-02-27 | 上海交通大学 | The method that coordinated desulfurization denitration is carried out to Flue Gas of Nonferrous Smelting using sodium alkali is circulated |
| CN109092017A (en) * | 2018-09-19 | 2018-12-28 | 上海交通大学 | A kind of method that flue gas oxidation and denitration controls nitrate generation in absorbing liquid |
| CN109173642A (en) * | 2018-10-31 | 2019-01-11 | 华能国际电力股份有限公司 | Treatment system and method for absorption liquid containing nitrite and nitrate after wet flue gas denitration |
| CN110505909A (en) * | 2017-02-15 | 2019-11-26 | 通用电气技术有限公司 | Oxidation Control for Improved Flue Gas Desulfurization Performance |
| CN113173662A (en) * | 2021-06-04 | 2021-07-27 | 杭州兴洋环保科技有限公司 | Acid mist tower wastewater treatment method and system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50144669A (en) * | 1974-05-10 | 1975-11-20 | ||
| JPS513368A (en) * | 1974-06-28 | 1976-01-12 | Tokyo Electric Power Co | SHITSUSHIKIHAIENDATSUSHOHO |
| JPS5183096A (en) * | 1974-12-26 | 1976-07-21 | Mitsui Miike Machinery Co Ltd | Haigasuchuno chitsusosankabutsu oyobi iosankabutsuo dojinijokyosurutotomoni setsukoochokusetsuseizosuru hoho |
| JPS51130691A (en) * | 1975-05-08 | 1976-11-13 | Mitsubishi Electric Corp | Washing liquid for removing nox |
| US3992508A (en) * | 1974-01-21 | 1976-11-16 | Kureha Kagaku Kogyo Kabushiki Kaisha | Method of removing nitrogen oxides from a gas containing nitrogen oxides |
| JPS5219173A (en) * | 1975-08-06 | 1977-02-14 | Mitsui Miike Mach Co Ltd | Procews for removal of nitrogen oxides and sulfur oxides in exhaust ga ses |
| JPS5240469A (en) * | 1975-09-26 | 1977-03-29 | Mitsubishi Heavy Ind Ltd | Process for removing nitrogen oxide in combustion exhaust gas |
| JPS5451986A (en) * | 1977-10-01 | 1979-04-24 | Idemitsu Kosan Co Ltd | Wet treatment method of gas containing nitrogen oxide |
| GB1547325A (en) * | 1976-08-24 | 1979-06-13 | Ishikawajima Harima Heavy Ind | Removal of oxides of nitrogen and sulphur from exhaust gas |
| EP0199037A2 (en) * | 1985-04-16 | 1986-10-29 | Walther & Cie. Aktiengesellschaft | Process for removing nitrogen oxides from waste gases already virtually desulfirized by washing |
| JPH04271813A (en) * | 1991-02-27 | 1992-09-28 | Ishikawajima Harima Heavy Ind Co Ltd | Nitrous oxide removal equipment |
-
2010
- 2010-12-22 CN CN 201010603906 patent/CN102078762A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3992508A (en) * | 1974-01-21 | 1976-11-16 | Kureha Kagaku Kogyo Kabushiki Kaisha | Method of removing nitrogen oxides from a gas containing nitrogen oxides |
| JPS50144669A (en) * | 1974-05-10 | 1975-11-20 | ||
| JPS513368A (en) * | 1974-06-28 | 1976-01-12 | Tokyo Electric Power Co | SHITSUSHIKIHAIENDATSUSHOHO |
| JPS5183096A (en) * | 1974-12-26 | 1976-07-21 | Mitsui Miike Machinery Co Ltd | Haigasuchuno chitsusosankabutsu oyobi iosankabutsuo dojinijokyosurutotomoni setsukoochokusetsuseizosuru hoho |
| JPS51130691A (en) * | 1975-05-08 | 1976-11-13 | Mitsubishi Electric Corp | Washing liquid for removing nox |
| JPS5219173A (en) * | 1975-08-06 | 1977-02-14 | Mitsui Miike Mach Co Ltd | Procews for removal of nitrogen oxides and sulfur oxides in exhaust ga ses |
| JPS5240469A (en) * | 1975-09-26 | 1977-03-29 | Mitsubishi Heavy Ind Ltd | Process for removing nitrogen oxide in combustion exhaust gas |
| GB1547325A (en) * | 1976-08-24 | 1979-06-13 | Ishikawajima Harima Heavy Ind | Removal of oxides of nitrogen and sulphur from exhaust gas |
| JPS5451986A (en) * | 1977-10-01 | 1979-04-24 | Idemitsu Kosan Co Ltd | Wet treatment method of gas containing nitrogen oxide |
| EP0199037A2 (en) * | 1985-04-16 | 1986-10-29 | Walther & Cie. Aktiengesellschaft | Process for removing nitrogen oxides from waste gases already virtually desulfirized by washing |
| JPH04271813A (en) * | 1991-02-27 | 1992-09-28 | Ishikawajima Harima Heavy Ind Co Ltd | Nitrous oxide removal equipment |
Non-Patent Citations (1)
| Title |
|---|
| 《化学世界》 20001130 任向红,樊秉安 亚硫酸盐去除硝基氧化剂废水中的亚硝酸盐 575-581 , 第11期 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102716648A (en) * | 2012-05-16 | 2012-10-10 | 北京航空航天大学 | Method for automatically controlling desulphurization and denitration by flue gas based on pH value and ORP value and apparatus thereof |
| CN104529012A (en) * | 2015-01-05 | 2015-04-22 | 北京化工大学 | Method for processing nitrite nitrogen in waste water |
| CN105457467A (en) * | 2015-12-31 | 2016-04-06 | 安徽省绿巨人环境技术有限公司 | Flue gas denitration device and method |
| CN106925095A (en) * | 2015-12-31 | 2017-07-07 | 杭州中兵环保股份有限公司 | NO in a kind of denitrating flue gasxChange into N2Apparatus and method |
| CN105833695A (en) * | 2016-05-03 | 2016-08-10 | 浙江天蓝环保技术股份有限公司 | Device and technology for wet desulfurization and denitrification of flue gas of coal-fired boiler and treatment of wastewater |
| CN110505909A (en) * | 2017-02-15 | 2019-11-26 | 通用电气技术有限公司 | Oxidation Control for Improved Flue Gas Desulfurization Performance |
| US10919016B2 (en) | 2017-02-15 | 2021-02-16 | General Electric Technology Gmbh | Oxidation control for improved flue gas desulfurization performance |
| CN107737520A (en) * | 2017-10-17 | 2018-02-27 | 上海交通大学 | The method that coordinated desulfurization denitration is carried out to Flue Gas of Nonferrous Smelting using sodium alkali is circulated |
| CN109092017A (en) * | 2018-09-19 | 2018-12-28 | 上海交通大学 | A kind of method that flue gas oxidation and denitration controls nitrate generation in absorbing liquid |
| CN109173642A (en) * | 2018-10-31 | 2019-01-11 | 华能国际电力股份有限公司 | Treatment system and method for absorption liquid containing nitrite and nitrate after wet flue gas denitration |
| CN109173642B (en) * | 2018-10-31 | 2023-09-22 | 华能国际电力股份有限公司 | A treatment system and method for absorbing liquid containing nitrite and nitrate after wet flue gas denitrification |
| CN113173662A (en) * | 2021-06-04 | 2021-07-27 | 杭州兴洋环保科技有限公司 | Acid mist tower wastewater treatment method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102078762A (en) | Nitrite wastewater denitrification process after wet denitration | |
| CN103212281B (en) | Smoke desulfurization and denitrification integration method and special device thereof | |
| CN102247750B (en) | Method for simultaneously desulfurizing and denitrifying flue gas by ozone catalytic oxidation process | |
| CN105854560B (en) | The method of flue gas desulfurization and denitrification | |
| CN105060545A (en) | System and method for softening treatment of desulfurization wastewater of coal-fired power plant | |
| CN101642665A (en) | Process for recycling nitrates from oxidation-absorption denitration byproducts | |
| CN109260918A (en) | A kind of flue gas desulfurization and denitrification integral method and its dedicated unit | |
| CN112915755B (en) | System and method for combined recovery of sulfur dioxide in flue gas and removal of nitrogen oxides | |
| CN113164901A (en) | Nitrogen enrichment in organic fertilizers using nitrate and air plasma | |
| CN108201777A (en) | A kind of flue gas desulfurization technique | |
| CN101134154A (en) | A process of catalytic oxidation flue gas desulfurization and oxidation process by-product polymerized ferric sulfate | |
| CN106731557A (en) | Absorbing liquid circulation utilization method and system during a kind of denitrating flue gas | |
| CN102600710B (en) | Treatment method of high-concentration ammonia nitrogen wastewater | |
| CN102008880A (en) | Method for realizing integrated desulfurization and denitrification and product recovery based on magnesium-ammonium method | |
| CN114832596B (en) | Method and device for preparing ammonia by active molecule oxidation flue gas double-circulation denitration | |
| CN102976359B (en) | Method for producing ammonium sulfate by removing sulfur through ammonia method | |
| CN109173642B (en) | A treatment system and method for absorbing liquid containing nitrite and nitrate after wet flue gas denitrification | |
| WO2015158239A1 (en) | Fume desulfurization and denitrification method | |
| CN104056538A (en) | Flue gas purifying system and method with integration of desulfurization and denitrification | |
| CN203253338U (en) | Flue gas desulphurization and denitration integrated device | |
| CN104529012A (en) | Method for processing nitrite nitrogen in waste water | |
| CN101642664B (en) | Process for simultaneously recycling salts during oxidation-absorption flue gas denitration | |
| CN107349771A (en) | A kind of method for reclaiming sulphur nitrogen resource from flue gas and producing HAS | |
| JP4232006B2 (en) | Treatment method of exhaust gas from sulfuric acid production process | |
| CN104190227B (en) | Synchronization denitrating system based on flue gas wet ammonia process desulfurizing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Hangzhou City, Zhejiang province Xiaoshan District 311202 North Street Xingyi Village Applicant after: Zhejiang Tianlan Environmental Protection Technology Co., Ltd. Address before: Hangzhou City, Zhejiang province Xiaoshan District 311202 North Street Xingyi Village Applicant before: Zhejiang Tianlan Environmental Protection Technology Co., Ltd. |
|
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110601 |