CN106477769A - A kind of processing method of nitrobenzene compounds waste water - Google Patents
A kind of processing method of nitrobenzene compounds waste water Download PDFInfo
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- CN106477769A CN106477769A CN201610948625.XA CN201610948625A CN106477769A CN 106477769 A CN106477769 A CN 106477769A CN 201610948625 A CN201610948625 A CN 201610948625A CN 106477769 A CN106477769 A CN 106477769A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Abstract
The invention discloses a kind of nitrobenzene compounds produce the processing method of waste water, including：(1) sodium sulfide reducing：Waste water is adjusted to alkalescence, adds akali sulphide, stirring reaction 30～60min at 80～100 DEG C, obtain reduction reaction liquid；(2) formaldehyde condensation：Reduction reaction liquid is adjusted to acidity, mixes with formalin at 70～80 DEG C and carry out condensation reaction, filter to get filtrate, in filtrate, COD clearance reaches 50～55%；(3) advanced oxidation reaction：Filtrate is carried out advanced oxidation reaction, obtains oxidation liquid；(4) discharge after will be post-treated for oxidation liquid, described post processing is at least one in flocculation reaction, absorption, air supporting and filtration.After the disposal methods of the present invention, the COD ＜ 350mg/L of nitrobenzene compounds waste water, total organic carbon TOC ＜ 150mg/L, COD clearance reaches more than 97%, TOC clearance reaches more than 97%, the total removal rate of Organic substance reaches 98%, reaches the discharge standard of national regulation.
Description
Technical field
The present invention relates to field of waste water treatment, more particularly, to a kind of processing method of nitrobenzene compounds waste water.
Background technology
Nitrobenzene compounds waste component is complicated, and toxicity is big, and colourity is high, and COD is high, and biodegradation difficulty is big, to ecology
Environment has larger harm.
The Chinese patent literature of Publication No. CN1626257 discloses a kind of organic dirt of wet oxidation process treatment of Nitrobenzene class
The method of dye thing, in autoclave, in liquid-phase system, under high-temperature and high-pressure conditions, with oxygen or air as oxidant,
Add cooxidation material, oxidation removal organic pollution；Cooxidation material and the mass concentration ratio of processed organic pollution
For 0.1～20, reaction temperature is 130～325 DEG C, and pressure is 0.5～20MPa, and wherein partial pressure of oxygen is 0.2～10MPa.The method
Range is narrow, is relatively suitable for the Nitrobenzol that electron-donating group replaces, and the clearance ratio of Nitrobenzene in Wastewater class material
Relatively low.
The Chinese patent literature of Publication No. CN1679983 discloses a kind of catalytic wet conjugated oxidation degrading nitrobenzene class
The method of pollutant, in the autoclave filling nitrobenzene class pollutant waste liquid, adds cooxidation material and catalyst, altogether
Oxidation material is 0.1～20 with the mass concentration ratio of processed organic pollution, with oxygen or air as oxidant, reaction temperature
Spend for 100～250 DEG C, reaction pressure is 0.5Mpa～10Mpa, wherein partial pressure of oxygen is 0.2Mpa～5Mpa.The method reacts bar
Part requirement is higher, and the clearance ratio of Nitrobenzol is relatively low, and very big to the clearance difference of each nitrobenzene derivative.
Fast red KD base, is the higher developer of fastness in azoic dyes, is mainly used in the dyeing of cotton, synthetic cotton, flaxen fiber
And stamp, it is also synthetic organic pigment C.I. pigment red 31,32,146,147,150,176,261 and C.I. pigment violet 43 etc.
Important intermediate.Multiple benzene ring structures are contained in the molecular structure of these organic pigments, compared with general azo organic pigment,
Because its molecular weight is big, sun-proof, the fastness ability such as heat-resisting are good, are the focuses of domestic technique exploitation, are also walking on international market
Pretty kind.
At present, this intermediate of fast red KD base is domestic many productions, and the process route being adopted is：With ortho-nitrophenyl first
Ether be raw material, through chloromethylation, hydrolysis, oxidation, chloride, condensation, reduction and be obtained.
Contain substantial amounts of nitrobenzene compounds in the production waste water of fast red KD base, wastewater contaminated by nitro-benzene compounds becomes
Divide complexity, toxicity is big, colourity is high, COD is high, biodegradation difficulty greatly, has larger harm to ecological environment.
Content of the invention
The invention provides a kind of processing method of nitrobenzene compounds waste water, the method is simple to operate, total in waste water
Organic removal rate is higher.
A kind of processing method of nitrobenzene compounds waste water, including：
(1) sodium sulfide reducing：Waste water is adjusted to alkalescence, adds akali sulphide, at 80～100 DEG C stirring reaction 30～
60min, obtains reduction reaction liquid；
(2) formaldehyde condensation：Reduction reaction liquid is adjusted to acidity, mixes with formalin at 70～80 DEG C and be condensed
Reaction, filters to get filtrate, in filtrate, COD clearance reaches 50～55%；
(3) advanced oxidation reaction：Filtrate is carried out advanced oxidation reaction, obtains oxidation liquid；
(4) discharge after will be post-treated for oxidation liquid, described post processing is flocculation reaction, absorption, air supporting and filtration
In at least one.
Nitrobenzene compounds species is more, complicated component, and common processing method is difficult to always effectively remove in this waste water
Organic substance.
Nitrobenzene compounds are reduced to relatively degradable benzene initially with akali sulphide by the processing method of the present invention
Aminated compoundss, part amino benzenes compounds again with formaldehyde condensation, the condensation product water solublity of generation is poor, is removed by filtration,
In filtrate, the Organic substance of residual is removed by advanced oxidation depth degradation, finally post-treated, and water outlet can reach waste water straightly discharging will
Ask.
The dosage of formaldehyde in formaldehyde condensation processes, should be controlled, effectively can remove amino benzenes compounds, make in filtrate
COD clearance reaches 50～55%, and filtrate water outlet after follow-up advanced oxidation afterwards requires up to waste water straightly discharging.
Described akali sulphide is one of sodium sulfide, sodium disulfide, sodium polysulphide and NaHS, preferably, institute
The akali sulphide stated is sodium sulfide.The reduction non-selectivity to nitro on phenyl ring for the sodium sulfide, can by multiple nitrobenzene compounds also
Originally it was corresponding amino benzenes compounds.
Preferably, on the basis of the quality of waste water, the addition of akali sulphide is 5～10%；It is further preferred that sulfuration
The addition of alkali is 7～8%.
According to the content of the useless Organic substance in water of nitrobenzene compounds, slightly excessive addition akali sulphide, make Nitrobenzene in Wastewater
Class compound is easier to be reduced, and reduces more abundant.
Akali sulphide can add in solid form, preferably, akali sulphide adds as a solution.
During sodium sulfide reducing, the pH value impact reduction effect of reduction system, preferably, in step (1), reduction
The pH value of reaction is 7～8.
Nitrobenzene compounds in waste water generate the amino benzenes compounds of relatively easy degraded through reduction, by with formaldehyde
Condensation generates the poor condensation substance of water solublity, separates out, be removed by filtration from waste water.
Preferably, in step (2), the pH value of condensation reaction is 2～3.
Control the addition of formaldehyde, the COD clearance in filtrate can be made after filtering to reach 50～55%.Can pass through afterwards
The Organic substance of follow-up advanced oxidation reaction fully degraded wherein residual.
Preferably, on the basis of the quality of reduction reaction liquid, the addition of formaldehyde is 3～5%.Formaldehyde is controlled to be to add
When entering amount, effectively can remove amino benzenes compounds, make COD clearance in filtrate reach 50～55%.
In step (3), advanced oxidation reaction can be Fenton's reaction, ozone oxidation, wet-type peroxide catalysis oxidation, wet
Formula ClO 2 catalyzed oxidation or wet type sodium hypochlorite catalysis oxidation.
Wherein, Fenton's reaction is with H2O2It is Fenton reagent with ferrous salt, H2O2In Fe2+Catalytic action under produce hydroxyl from
By base, it has strong oxidizing property, can aoxidize some difficult degradations and virose material；Fenton reagent energy when processing organic wastewater
Produce ferric hydroxide colloid, equally can play flocculation.
Preferably, advanced oxidation reacts for Fenton's reaction：At 40～50 DEG C, add ferrous salt, H in filtrate2O2,
Reaction 0.5～5h.
Preferably, on the basis of the quality of filtrate, the addition of ferrous salt is 0.2～0.5%, H2O2Addition be 6
～8%.
Preferably, in step (4), described post processing is flocculation reaction：The pH value of oxidation liquid is adjusted to 8～
9, stirring reaction 20～40min, add flocculant, stand 3～5min, filter.
The pH value of oxidation liquid is adjusted to after 8～9, wherein iron ion can generate ferric hydroxide colloid, absorption is useless
The particle suspensions of residual and Organic substance in water, are gone further by filtering the Organic substance making residual in oxidation liquid
Remove.
Described nitrobenzene compounds waste water is derived from the production process of dyestuff intermediate fast red KD base.
Compared with prior art, beneficial effects of the present invention are：
After the disposal methods of the present invention, the COD ＜ 350mg/L, total organic carbon TOC of nitrobenzene compounds waste water
＜ 150mg/L, COD clearance reaches more than 97%, TOC clearance and reaches more than 97%, and the total removal rate of Organic substance reaches 98%, reaches
Discharge standard to national regulation.
The present invention is combined by sodium sulfide reducing-formaldehyde condensation-advanced oxidation-flocculation reaction.Akali sulphide is by Nitrobenzol
Class compound is reduced to relatively degradable amino benzenes compounds, amino benzenes compounds again with formaldehyde condensation, the condensation of generation
Product water solublity is poor, is removed by filtration, and in filtrate, the Organic substance Fenton's reaction depth degradation of residual removes, and eventually passes flocculation
Filter, water outlet can reach waste water straightly discharging requirement；Between each step of the present invention, mutual synergism, indispensable, and operates
Order can not overturn, otherwise it is impossible to obtain the treatment effect of the present invention.
Specific embodiment
Certain nitrobenzene compounds waste water is in brown color, and pH is 6.2, COD is 11560mg/L, and TOC (total organic carbon) is
5214mg/L.
Embodiment 1
(1) sodium sulfide reducing：It is 7.6 with the pH that liquid caustic soda adjusts waste water, add the sodium sulfide solution that mass fraction is 30%,
On the basis of the quality of waste water, the addition of sodium sulfide is 8%, is placed in 90 DEG C of stirred in water bath reaction 50min；
(2) formaldehyde condensation：It is 2 with the pH of dilute sulfuric acid regulating step (1) water outlet, add formaldehyde to be condensed, with waste water
On the basis of quality, the addition of formaldehyde is 5%, is placed in 80 DEG C of stirred in water bath reaction 40min, filters；
The COD of filtrate is 5630mg/L, and TOC is 2586mg/L, and the clearance of COD and TOC is respectively 51.3% He
50.4%；
(3) Fenton's reaction：FeSO is added in the water outlet of step (2)4·7H2O, is placed in 50 DEG C of water-bath, then uses pump
H is inputted in waste water2O2, react 3h；
On the basis of the quality of waste water, FeSO4·7H2The addition of O is 0.4%, H2O2Addition be 8%；
(4) flocculation reaction：Adding liquid caustic soda to adjust its pH in the water outlet of step (3) is 8, stirring reaction 30min, Ran Houjia
Enter the PAM solution that the mass fraction that mass percent is 0.05% is 0.2%, stand 3min, filter；
The COD of water outlet is 320mg/L, and TOC is 120mg/L, and the total removal rate of Organic substance is 97.7%.
Embodiment 2
(1) sodium sulfide reducing：It is 7.2 with the pH that liquid caustic soda adjusts waste water, add the sodium sulfide solution that mass fraction is 30%,
On the basis of the quality of waste water, the addition of sodium sulfide is 8%, is placed in 100 DEG C of stirred in water bath reaction 30min；
(2) formaldehyde condensation：It is 3 with the pH of dilute sulfuric acid regulating step (1) water outlet, add formaldehyde to be condensed, with waste water
On the basis of quality, the addition of formaldehyde is 4%, is placed in 80 DEG C of stirred in water bath reaction 30min, filters；
The COD of filtrate is 5438mg/L, and TOC is 2398mg/L, and the clearance of COD and TOC is respectively 53% and 54%；
(3) Fenton's reaction：FeSO is added in the water outlet of step (2)4·7H2O, is placed in 40 DEG C of water-bath, then uses pump
H is inputted in waste water2O2, react 2h；
On the basis of the quality of waste water, FeSO4·7H2The addition of O is 0.5%, H2O2Addition be 6%；
(4) flocculation reaction：Adding liquid caustic soda to adjust its pH in the water outlet of step (3) is 9, stirring reaction 40min, Ran Houjia
Enter the PAM solution that the mass fraction that mass percent is 0.15% is 0.2%, stand 5min, filter；
The COD of water outlet is 280mg/L, and TOC is 98mg/L, and the total removal rate of Organic substance is 98.1%.
Embodiment 3
(1) sodium sulfide reducing：It is 7.6 with the pH that liquid caustic soda adjusts waste water, add the sodium sulfide solution that mass fraction is 30%,
On the basis of the quality of waste water, the addition of sodium sulfide is 7%, is placed in 90 DEG C of stirred in water bath reaction 40min；
(2) formaldehyde condensation：It is 2 with the pH of dilute sulfuric acid regulating step (1) water outlet, add formaldehyde to be condensed, with waste water
On the basis of quality, the addition of formaldehyde is 5%, is placed in 70 DEG C of stirred in water bath reaction 40min, filters；
The COD of filtrate is 5582mg/L, and TOC is 2432mg/L, and the clearance of COD and TOC is respectively 51.7% He
53.3%；
(3) Fenton's reaction：FeSO is added in the water outlet of phase step (2)4·7H2O, is placed in 45 DEG C of water-bath, then uses pump
H is inputted in waste water2O2, react 2.5h；
On the basis of the quality of waste water, FeSO4·7H2The addition of O is 0.3%, H2O2Addition be 7%；
(4) flocculation reaction：Adding liquid caustic soda to adjust its pH in the water outlet of step (3) is 8.5, stirring reaction 30min, then
Add the PAM solution that the mass fraction that mass percent is 0.2% is 0.2%, stand 3min, filter；
The COD of water outlet is 298mg/L, and TOC is 106mg/L, and the total removal rate of Organic substance is 98%.
Comparative example 1
Compared with Example 2, only execution step (3) and step (4).
The COD of water outlet is 6382mg/L, and TOC is 2843mg/L, and the total removal rate of Organic substance is 53%.
Comparative example 2
Compared with Example 2, the order of each step execution is step (3)-step (1)-step (2)-step (4).
The COD of water outlet is 849mg/L, and TOC is 546mg/L, and the total removal rate of Organic substance is 83%.
Comparative example 3
Certain nitrobenzene compounds waste water be in brown color, pH be 6.2, COD=11560mg/L, TOC (total organic carbon)=
5214mg/L.
(1) Fenton's reaction：It is 3.5 with the pH of dilute sulfuric acid regulating step waste water, add mass percent to be 0.4%
FeSO4·7H2O, is placed in 60 DEG C of water-bath, then inputs H in waste water with pump2O2, total coreaction 2h, H2O2Total addition
For 8%.
(2) flocculation reaction：The pH that liquid caustic soda adjusts waste water is added to be 8 in the water outlet of step (1), stirring reaction 30min, so
Add the PAM that the mass fraction that mass percent is 0.15% is 0.2% afterwards, be slowly stirred 2min, then stand 3min, mistake
Filter.
(3) vulcanize sodium reduction：Sodium sulfide (the matter of sodium sulfide that mass percent is 8% is added in the water outlet of step (2)
Amount fraction is 30%), it is placed in 90 DEG C of stirred in water bath reaction 50min
(4) formaldehyde condensation：It is 2 with the pH that dilute sulfuric acid adjusts the waste water processing through step (1), addition mass percent is
5% formalin, is placed in 80 DEG C of stirred in water bath reaction 40min, filters, the COD=3420mg/L of filtrate, TOC (always have
Machine carbon)=1658mg/L
Comparative example 4
Certain nitrobenzene compounds waste water be in brown color, pH be 6.2, COD=11560mg/L, TOC (total organic carbon)=
5214mg/L.
(1) vulcanize sodium reduction：It is 7.6 with the pH that liquid caustic soda adjusts waste water, add the sodium sulfide (sulfur that mass percent is 8%
The mass fraction changing sodium is 30%), it is placed in 90 DEG C of stirred in water bath reaction 50min
(2) formaldehyde condensation：It is 2 with the pH that dilute sulfuric acid adjusts the waste water processing through step (1), addition mass percent is
5% formalin, is placed in 80 DEG C of stirred in water bath reaction 40min, filters, the COD=5630mg/L of filtrate, TOC (always have
Machine carbon)=2586mg/L
(3) flocculation reaction：The pH that liquid caustic soda adjusts waste water is added to be 8 in the water outlet of step (2), stirring reaction 30min, so
Add the PAM that the mass fraction that mass percent is 0.15% is 0.2% afterwards, be slowly stirred 2min, then stand 3min, mistake
Filter, the COD=4563mg/L of water outlet, TOC (total organic carbon)=2230mg/L.
Compared with Example 2, lack step (3).
Comparative example 5
Certain nitrobenzene compounds waste water be in brown color, pH be 6.2, COD=11560mg/L, TOC (total organic carbon)=
5214mg/L.
(1) vulcanize sodium reduction：It is 7.6 with the pH that liquid caustic soda adjusts waste water, add the sodium sulfide (sulfur that mass percent is 8%
The mass fraction changing sodium is 30%), it is placed in 90 DEG C of stirred in water bath reaction 50min
(2) Fenton's reaction：The pH adjusting the waste water of the process through step (1) with dilute sulfuric acid is 3.5, adds mass percent
FeSO for 0.4%4·7H2O, is placed in 50 DEG C of water-bath, then inputs H in waste water with pump2O2, total coreaction 2h, H2O2
Total addition be 8%.
(3) flocculation reaction：The pH that liquid caustic soda adjusts waste water is added to be 8 in the water outlet of step (2), stirring reaction 30min, so
Add the PAM that the mass fraction that mass percent is 0.15% is 0.2% afterwards, be slowly stirred 2min, then stand 3min, mistake
Filter, the COD=5982mg/L of water outlet, TOC (total organic carbon)=2738mg/L.
By the contrast between embodiment 2, comparative example 1,2,3,4,5 it is found that mutually assisting between step (1)～(4)
Same-action, four is indispensable, and four execution sequences can not overturn, and is otherwise unable to reach the treatment effect of the present invention.
Comparative example 6
By adjusting the addition of formaldehyde, in the filtrate that rate-determining steps (2) produce, COD clearance is 30%, other operations
With embodiment 2.
The COD of water outlet is 1183mg/L, and TOC is 558mg/L, and the total removal rate of Organic substance is 78%.
By the contrast between embodiment 2 and comparative example 6 it is found that after step (1) and step (2), waste water should be made
Middle nitrobenzene Organic substance is effectively removed, and that is, COD clearance reaches more than 50%, then through advanced oxidation reaction and after locate
Reason, processes the requirement that water outlet can be only achieved waste water straightly discharging.
Embodiment described above technical scheme and beneficial effect have been described in detail it should be understood that
The foregoing is only the specific embodiment of the present invention, be not limited to the present invention, all done in the spirit of the present invention
Any modification, supplement and equivalent etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of processing method of nitrobenzene compounds waste water is it is characterised in that include：
(1) sodium sulfide reducing：Waste water is adjusted to alkalescence, adds akali sulphide, stirring reaction 30～60min at 80～100 DEG C,
Obtain reduction reaction liquid；
(2) formaldehyde condensation：Reduction reaction liquid is adjusted to acidity, mixes with formalin at 70～80 DEG C and carry out condensation instead
Should, filter to get filtrate, in filtrate, COD clearance reaches 50～55%；
(3) advanced oxidation reaction：Filtrate is carried out advanced oxidation reaction, obtains oxidation liquid；
(4) discharge after will be post-treated for oxidation liquid, described post processing is in flocculation reaction, absorption, air supporting and filtration
At least one.
2. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that in step (1), go back
The pH value of former reaction is 7～8.
3. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that in step (1), with
On the basis of the quality of waste water, the addition of akali sulphide is 5～10%.
4. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that institute in step (1)
The akali sulphide stated is sodium sulfide, sodium disulfide, sodium polysulphide, at least one in NaHS.
5. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that in step (2), contract
The pH value closing reaction is 2～3.
6. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that with reduction reaction liquid
Quality on the basis of, the addition of formaldehyde is 3～5%.
7. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that in step (3), high
Level oxidation reaction is Fenton's reaction：At 40～50 DEG C, add ferrous salt, H in filtrate2O2, react 0.5～5h.
8. the processing method of nitrobenzene compounds waste water according to claim 6 is it is characterised in that quality with filtrate
On the basis of, the addition of ferrous salt is 0.2～0.5%, H2O2Addition be 6～8%.
9. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that in step (4), institute
The post processing stated is flocculation reaction：The pH value of oxidation liquid is adjusted to 8～9, stirring reaction 20～40min, addition helps solidifying
Agent, stands 3～5min, filters.
10. the processing method of nitrobenzene compounds waste water according to claim 1 is it is characterised in that described nitro
Benzene-like compounds waste water is derived from the production process of dyestuff intermediate fast red KD base.
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| CN108793552A (en) * | 2018-06-07 | 2018-11-13 | 浙江奇彩环境科技股份有限公司 | A kind of processing method of nigrosine production waste water |
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| US6379562B1 (en) * | 2001-03-21 | 2002-04-30 | Atr Products And Chemicals, Inc. | Treatment of water containing organic wastes with aromatic amine nitrate salts |
| CN101402503A (en) * | 2008-10-23 | 2009-04-08 | 浙江龙盛化工研究有限公司 | Treatment method for wastewater from dinitrobenzene production with benzene mixed acid nitrification |
| CN104045142A (en) * | 2014-07-08 | 2014-09-17 | 北京师范大学 | Method for treating m-dinitrobenzene wastewater through catalytic reduction |
| CN104445711A (en) * | 2014-10-29 | 2015-03-25 | 绍兴奇彩化工有限公司 | Treatment method for aniline wastewater |
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| CN108793552A (en) * | 2018-06-07 | 2018-11-13 | 浙江奇彩环境科技股份有限公司 | A kind of processing method of nigrosine production waste water |
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