CN103864196B - Treatment method for waste liquid produced by permanganate titration COD (chemical oxygen demand) online determination instrument - Google Patents
Treatment method for waste liquid produced by permanganate titration COD (chemical oxygen demand) online determination instrument Download PDFInfo
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- CN103864196B CN103864196B CN201410101625.7A CN201410101625A CN103864196B CN 103864196 B CN103864196 B CN 103864196B CN 201410101625 A CN201410101625 A CN 201410101625A CN 103864196 B CN103864196 B CN 103864196B
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- 239000002699 waste material Substances 0.000 title claims abstract description 68
- 239000007788 liquid Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000004448 titration Methods 0.000 title abstract 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title abstract 2
- 229910052760 oxygen Inorganic materials 0.000 title abstract 2
- 239000001301 oxygen Substances 0.000 title abstract 2
- 239000000126 substance Substances 0.000 title abstract 2
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 230000001131 transforming effect Effects 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 18
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 239000012286 potassium permanganate Substances 0.000 claims description 26
- 239000006228 supernatant Substances 0.000 claims description 20
- 150000002500 ions Chemical class 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000001117 sulphuric acid Substances 0.000 claims description 4
- 235000011149 sulphuric acid Nutrition 0.000 claims description 4
- 238000010561 standard procedure Methods 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 3
- 229910021577 Iron(II) chloride Inorganic materials 0.000 abstract 1
- 235000019441 ethanol Nutrition 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 231100000086 high toxicity Toxicity 0.000 abstract 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 abstract 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 abstract 1
- 231100000053 low toxicity Toxicity 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- PODWXQQNRWNDGD-UHFFFAOYSA-L sodium thiosulfate pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].[O-]S([S-])(=O)=O PODWXQQNRWNDGD-UHFFFAOYSA-L 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 30
- 239000011572 manganese Substances 0.000 description 19
- 229910001385 heavy metal Inorganic materials 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 231100000419 toxicity Toxicity 0.000 description 6
- 230000001988 toxicity Effects 0.000 description 6
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 230000002110 toxicologic effect Effects 0.000 description 5
- 231100000027 toxicology Toxicity 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- DOBUSJIVSSJEDA-UHFFFAOYSA-L 1,3-dioxa-2$l^{6}-thia-4-mercuracyclobutane 2,2-dioxide Chemical compound [Hg+2].[O-]S([O-])(=O)=O DOBUSJIVSSJEDA-UHFFFAOYSA-L 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000372 mercury(II) sulfate Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention provides a treatment method for waste liquid produced by a permanganate titration COD (chemical oxygen demand) online determination instrument. The treatment method for the waste liquid produced by the permanganate titration COD online determination instrument is characterized by comprising the following steps: firstly, preparing a transforming agent solution, wherein concentration of Na2C2O4 in the transforming agent solution is 1-50g/L, concentration of Na2S2O3.5H2O is 0-100g/L, concentration of FeSO4 is 0-27g/L, concentration of FeCl2 is 0-23g/L, concentration of ethyl alcohol is 0-24g/L and concentration of phenol is 0-24g/L; secondly, adding the transforming agent solution into the waste liquid which is produced by the permanganate titration COD online determination instrument, heating, stirring and performing reaction; thirdly, adding alkaline into the waste liquid after the reaction in the step two is finished, stirring and performing reaction, standing after the reaction is finished, separating supernate from sediment, and regulating pH value of the supernate to be 7.0-8.0, so that treated waste liquid is obtained. By adopting the treatment method for the waste liquid produced by the permanganate titration COD online determination instrument, the waste liquid produced by COD online determination by adopting a national standard method can be rapidly and comprehensively treated, and solution which is difficult to store and has high toxicity can be transformed into solid which is easy to store and transport and has low toxicity.
Description
Technical field
The present invention relates to the method for treating waste liquid that potassium permanganate process on-line determination COD instrument produces, for the treatment of the waste liquid that potassium permanganate process on-line determination COD instrument produces.
Background technology
Potassium permanganate process measure COD be at present both at home and abroad consistent generally acknowledge mensuration COD standard method (State Bureau of Environmental Protection compiles, water and waste water method for monitoring and analyzing [M]. the 4th edition. Beijing: environmental science press, 2002,10-213).The principle measured is: the mixed solution of water sample, potassium permanganate and the vitriol oil is heated to 100 DEG C in digestion pool, high manganese ion is reduced positive divalent as oxygenant manganese from positive 7 valencys and changes color, in reaction, the ORP value of solution becomes corresponding relation with the content of organic compound in sample, COD analytical instrument by ORP value and potassium permanganate consumption directly the COD in sample is shown.Part instrument Sulfuric acid disilver salt catalyzer, removes the interference of chlorion with Mercury bisulfate.Therefore, measure acidity in the waste liquid of COD high, and the content of toxic heavy metal manganese, silver is high.If not treated, directly enter water drain, serious secondary pollution can be caused.Especially China is in the high-speed developing period now, the increasing of environment supervision, online water quality is all actively being installed by various places environmental administration, Online monitoring of pollution sources equipment, Most current import and domestic " COD on line analyzer " all adopt GB potassium permanganate process to measure COD, and these on line analyzers all do not design the treatment unit of waste liquid, these discharging of waste liquid containing toxic heavy metal ion are in water drain or field environment, although every secondary amounts is little, but concentration is higher, accumulate over a long period, still serious secondary pollution can be caused, so the treatment process studying this waste liquid seems day by day urgent.
At present to measuring the treatment process of COD waste liquid mainly under stirring at low speed, after extraction agent is dissolved in solvent, slowly add promoting agent, high-speed stirring again, add isopyknic additive agent modified, obtained water-in-oil liquid, the waste water of manganese concentration at 10 ~ 200m g/L is processed, profit volume ratio is 1: 3 ~ 1: 50, outer aqueous phase p H is 3.0 ~ 6.5, after stirring at low speed 10 ~ 40min, stratification, the oil phase obtained after layering is through supercentrifuge breakdown of emulsion, isolate organic phase and interior aqueous phase, interior aqueous phase is used for the recycling of manganese, organic phase returns and continues to use, water outlet Fe content reaches discharging standards.
Summary of the invention
The method for treating waste liquid that the object of this invention is to provide the generation of potassium permanganate process on-line determination COD instrument can make the toxic heavy metal ion waste liquid harmless treatment produced in national standard method (GB/11892-1989) on-line measurement COD process, prevents secondary pollution from occurring.
In order to achieve the above object, the invention provides the method for treating waste liquid that a kind of potassium permanganate process on-line determination COD instrument produces, it is characterized in that, concrete steps comprise:
The first step: preparation transforming agent solution, Na in described transforming agent solution
2c
2o
4concentration be 1-50g/L, Na
2s
2o
35H
2the concentration of O is 0-100g/L, FeSO
4concentration is 0-27g/L, FeCl
2concentration be 0-23g/L, the concentration of ethanol is 0-24g/L, the concentration of phenol is 0-24g/L;
Second step: add transforming agent solution in the waste liquid that potassium permanganate process on-line determination COD instrument produces, heated and stirred is reacted;
3rd step: will add alkali, stirring reaction in the reacted waste liquid of second step, leaves standstill after reaction, separation of supernatant and settling, and the pH value regulating supernatant liquor is 7.0-8.0, obtains the waste liquid after processing.
Preferably, the metal ions in waste liquor concentration that described potassium permanganate process on-line determination COD instrument produces is, Mn
2+: 1-68g/L, MnO
4 -: 0-2.83g/L, Ag
+: 0.1-2.22g/L, C
2o
4 2-: 0-2.5g/L.
Preferably, the ratio of the volume of the waste liquid that the transforming agent in described second step produces with potassium permanganate process on-line determination COD instrument is 1-3.5
:10.
Preferably, the temperature of reaction in described second step is 40-80 DEG C.
Preferably, the alkali in the 3rd described step is NaOH, Ca (OH)
2and Na
2cO
3in at least one, its quality added with the ratio of the volume of waste liquid is: 10-600g: 1L.
Preferably, use hydrochloric acid soln or sulphuric acid soln to regulate the pH value of supernatant liquor in the 3rd described step, the concentration of volume percent of hydrochloric acid soln or sulphuric acid soln is 10%-30%.
Preferably, the waste liquid after described process is qualified discharge after the expanded graphite cleaner of load nano-titanium dioxide.
More preferably, in the expanded graphite cleaner of described load nano-titanium dioxide, the amount of the expanded graphite of load nano-titanium dioxide is the 10%-50% of cleaner volume.
7 valency mn ions in solution can be reduced into divalent mn ion by transforming agent solution of the present invention, reduce MnO in waste liquid
4the concentration of-ion.Vitriol oil concentration in waste liquid can be diluted simultaneously, eliminate the vitriol oil in waste liquid and, to the interference of subsequent chemical reaction, avoid it in subsequent step, affect Mn
2+generation, the reaction accelerated in solution makes by adding alkali the Mn2+ that in waste liquid, remaining toxicity is stronger, Ag+ be converted into precipitation collect remove; Supernatant liquor just can qualified discharge after simple pH process, achieve waste liquid fast and effectively process, and be easily stores and the solid transported, toxicity is lower by being not easy to store with transport, solution transition that toxicity is higher.After testing, only containing the ion to environment toxicological harmless in supernatant liquor, heavy metal Ag+, Mn2+ content is almost nil, well below the index request of national standard.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention fast, comprehensively can process the waste liquid adopting national standard method on-line determination COD to produce, and achieving being not easy storage with the solution transition transported, toxicity is higher is easily store and the solid transported, toxicity is lower.
(2) the present invention is by preparing and adding transforming agent, and effectively avoid the vitriol oil of waste liquid middle and high concentration to participate in chemical reaction and produce SO2, harm operator's is healthy, reaches the object effectively removing toxic heavy metal simultaneously;
(3) by adding transforming agent, can by have positive 7 valency manganese to be converted into remove positive divalent manganese;
(4) by adding alkali or alkaline solution, the last throw out generated of reaction is only very low containing the nontoxic or toxicity of a heavy metal compound, and volume is little, only accounts for 1/10 of overall solution volume, reclaims, simple to operate;
(5) speed of response is fast, and whole reaction process can complete in 15min, and reaction effect is easy to identify according to color.
Embodiment
For making the present invention become apparent, hereby with preferred embodiment, be described in detail below.
Embodiment 1
Add the waste liquid that 1L potassium permanganate process on-line determination COD instrument produces in the reactor, metal ions in waste liquor concentration is, Mn
2+: lg/L, MnO
4 -: 2.1g/L, Ag
+: 0.2g/L.
Preparation transforming agent solution: by Na
2c
2o
4, Na
2s
2o
35H
2o, Fe
2(SO
3)
3, FeCl
2, ethanol and phenol is added to the water, stirring and dissolving, obtains transforming agent solution, Na in described transforming agent solution
2c
2o
4concentration be 10g/L, Na
2s
2o
35H
2the concentration of O is 24.5g/L, FeSO
4concentration is 5.2g/L, FeCl
2concentration be 02g/L, the concentration of ethanol is 15.1g/L, the concentration of phenol is 15.1g/L, pH value of solution scope is between 6.5 ~ 8.5;
In reactor, add 5L transforming agent solution, be heated to 70 DEG C of stirring reactions 2 minutes, now, not containing MnO in waste liquid
4 -ion, only containing Mn
2+ion:
5g NaOH is added again, stirring reaction 5 minutes in reactor; Static placement, supernatant liquor of draining, separation of supernatant and settling, add 15% dilute hydrochloric acid and regulate the pH value of supernatant liquor to be 7.0, obtains the waste liquid after processing, collect settling simultaneously.Detect through (national standard method and elemental analyser), only containing the ion to environment toxicological harmless in the waste liquid after process, heavy metal Ag
+, Hg
2+, Mn
2+, MnO
4 -content be 0.01 respectively, do not detect, 0.01 and 0, well below the index request of national standard.
Embodiment 2:
Add the waste liquid that 1L potassium permanganate process on-line determination COD instrument produces in the reactor, metal ions in waste liquor concentration is, Mn
2+: 2g/L, MnO
4 -: 0.1g/L, Ag
+: 0g/L.
Preparation transforming agent solution: by Na
2c
2o
4, Na
2s
2o
35H
2o, Fe
2(SO
3)
3, FeCl
2, ethanol is added to the water, stirring and dissolving, obtains transforming agent solution, Na in described transforming agent solution
2c
2o
4concentration be 2g/L, Na
2s
2o
35H
2the concentration of O is 14.5g/L, FeSO
4concentration be 3.1g/L, FeCl
2concentration be 0.2g/L, the concentration of ethanol is 10.1g/L, pH value of solution scope is between 6.5 ~ 8.5.
In reactor, add 5L transforming agent solution, be heated to 70 DEG C of stirring reactions 2 minutes, now, not containing MnO in waste liquid
4 -ion, only containing Mn
2+ion;
6g Ca (OH) is added again in reactor
2, stirring reaction 5 minutes; Static placement, supernatant liquor of draining, separation of supernatant and settling, add 17% dilute hydrochloric acid and regulate the pH value of supernatant liquor to be 8.0, obtains the waste liquid after processing, collect settling simultaneously.Detect through national standard method and elemental analyser, only containing the ion to environment toxicological harmless in the waste liquid after process, heavy metal Ag
+, Hg
2+, Mn
2+, MnO
4 -content be respectively do not detect, do not detect, 0.01 and do not detect, well below the index request of national standard.
Embodiment 3:
Add the waste liquid that 1L potassium permanganate process on-line determination COD instrument produces in the reactor, metal ions in waste liquor concentration is, Mn
2+: 1.4g/L, MnO
4 -: 0.4g/L, Ag
+: 1.5g/L.
Preparation transforming agent solution: by Na
2c
2o
4, FeCl
2, ethanol is added to the water, stirring and dissolving, obtains transforming agent solution, Na in described transforming agent solution
2c
2o
4concentration be 3g/L, FeCl
2concentration be 1.9g/L, the concentration of ethanol is 20.1g/L, pH value of solution scope is between 6.5 ~ 8.5.
In reactor, add 5L transforming agent solution, be heated to 75 DEG C of stirring reactions 2 minutes, now, not containing MnO in waste liquid
4 -ion, only containing Mn
2+ion:
10g Na is added again in reactor
2cO
3, stirring reaction 5 minutes; Static placement, supernatant liquor of draining, separation of supernatant and settling, add 25% dilute hydrochloric acid and regulate the pH value of supernatant liquor to be 7.5, obtains the waste liquid after processing, collect settling simultaneously.Detect through national standard method and elemental analyser, only containing the ion to environment toxicological harmless in the waste liquid after process, heavy metal Ag
+, Hg
2+, Mn
2+, MnO
4 -content be 0.01 respectively, 0.01, do not detect and do not detect, well below the index request of national standard.
Embodiment 4
Add the waste liquid that 1L potassium permanganate process on-line determination COD instrument produces in the reactor, metal ions in waste liquor concentration is, Mn
2+: 6.8g/L, MnO
4 -: 1.2g/L, Ag
+: 1.5g/L.
Preparation transforming agent solution: by Na
2c
2o
4, Na
2s
2o
35H
2o, Fe
2(SO
3)
3, FeCl
2, ethanol, phenol is added to the water, stirring and dissolving, obtains transforming agent solution, Na in described transforming agent solution
2c
2o
4concentration be 8.8g/L, Na
2s
2o
35H
2the concentration of O is 12.5g/L, FeSO
4concentration is 4.1g/L, FeCl
2concentration be 0.5g/L, the concentration of ethanol is 14.1g/L, phenol: 1.1g/L, pH value of solution scope is between 6.5 ~ 8.5.
In reactor, add 5L transforming agent solution, be heated to 80 DEG C of stirring reactions 2 minutes, now, not containing MnO in waste liquid
4 -ion, only containing Mn
2+ion;
19g Na is added again in reactor
2cO
3, stirring reaction 5 minutes; Static placement, supernatant liquor of draining, separation of supernatant and settling, add 25% dilute hydrochloric acid and regulate the pH value of supernatant liquor to be 7.5, obtains the waste liquid after processing, collect settling simultaneously.Detect through national standard method and elemental analyser, only containing the ion to environment toxicological harmless in the waste liquid after process, heavy metal Ag
+, Hg
2+, Mn
2+, MnO
4 -content be 0.01 respectively, do not detect, 0.01 and do not detect, well below the index request of national standard.
Above-mentioned waste liquid after the process again of the expanded graphite cleaner of load nano-titanium dioxide, Ag
+, Hg
2+, Mn
2+, MnO
4 -all do not detect.All do not detect when in the expanded graphite cleaner of load nano-titanium dioxide, the amount of the expanded graphite of load nano-titanium dioxide is cleaner volume 10%-50%.Far below GB8978-1996 defined standard.
Claims (7)
1. a method for treating waste liquid for potassium permanganate process on-line determination COD instrument generation, it is characterized in that, concrete steps comprise:
The first step: preparation transforming agent solution, Na in described transforming agent solution
2c
2o
4concentration be 1-50g/L, Na
2s
2o
35H
2the concentration of 0 is 0-100g/L, FeSO
4concentration be 0-27g/L, FeCl
2concentration be 0-23g/ L, the concentration of ethanol is 0-24g/ L, the concentration of phenol is 0-24g/L;
Second step: add transforming agent solution in the waste liquid that potassium permanganate process on-line determination COD instrument produces, heated and stirred is reacted;
3rd step: alkali will be added in the reacted waste liquid of second step, stirring reaction, leave standstill after reaction, separation of supernatant and settling, the pH value regulating supernatant liquor is 7. 0-8. O, obtain the waste liquid after processing, the waste liquid after described process is qualified discharge after the expanded graphite cleaner of load nano-titanium dioxide.
2. the method for treating waste liquid of potassium permanganate process on-line determination COD instrument generation as claimed in claim 1, is characterized in that, in the waste liquid that described potassium permanganate process on-line determination COD instrument produces, following ion concentration is: Mn
2+: 1-6.8g/L, MnO
4 -: 0-2.83g/L, Ag
+: 0.1-2. 22g/L, C
2o
4 2-: 0-2.5g/L.
3. the method for treating waste liquid of potassium permanganate process on-line determination COD instrument generation as claimed in claim 1, it is characterized in that, the ratio of the volume of the waste liquid that the transforming agent in described second step produces with potassium permanganate process on-line determination COD instrument is 1-3.5:10.
4. the method for treating waste liquid of potassium permanganate process on-line determination COD instrument generation as claimed in claim 1, it is characterized in that, the temperature of reaction in described second step is 40-80 DEG C.
5. the method for treating waste liquid of potassium permanganate process on-line determination COD instrument generation as claimed in claim 1, it is characterized in that, the alkali in the 3rd described step is NaOH, Ca(OH)
2and Na
2cO
3in at least one, its quality added with the ratio of the volume of waste liquid is: 10-600g: 1L.
6. the method for treating waste liquid of potassium permanganate process on-line determination COD instrument generation as claimed in claim 1, it is characterized in that, use hydrochloric acid soln or sulphuric acid soln to regulate the pH value of supernatant liquor in the 3rd described step, the concentration of volume percent of hydrochloric acid soln or sulphuric acid soln is 10%-30%.
7. the method for treating waste liquid of potassium permanganate process on-line determination COD instrument generation as claimed in claim 1, it is characterized in that, in the expanded graphite cleaner of described load nano-titanium dioxide, the amount of the expanded graphite of load nano-titanium dioxide is the 10%-50% of cleaner volume.
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|---|---|---|---|
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|---|---|---|---|
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52104354A (en) * | 1976-02-27 | 1977-09-01 | Shimadzu Corp | Method and apparatus for treating water containing permanganic acid io ns |
| JPS5367676A (en) * | 1976-11-30 | 1978-06-16 | Nippon Soda Co Ltd | Detoxifying method for waste solution |
| DE10029146A1 (en) * | 1999-06-26 | 2000-12-28 | Merck Patent Gmbh | Recycling sulfuric acid solution containing metals, preferably test solutions from determination of chemical oxygen demand, involves redox-controlled separation of silver amalgam with iron and precipitation as hydroxide |
| CN102464399A (en) * | 2011-10-20 | 2012-05-23 | 常州亚环环保科技有限公司 | Composite agent for removing manganese in wastewater and application method thereof |
| CN102583815B (en) * | 2012-01-28 | 2013-08-28 | 马鞍山市桓泰环保设备有限公司 | Method for treating waste liquid produced during on-line chemical oxygen demand (COD) determination with potassium dichromate method |
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