CN105753236B - The processing method of economic benefits and social benefits condensed water in a kind of metronidazole waste water - Google Patents

The processing method of economic benefits and social benefits condensed water in a kind of metronidazole waste water Download PDF

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CN105753236B
CN105753236B CN201610173429.XA CN201610173429A CN105753236B CN 105753236 B CN105753236 B CN 105753236B CN 201610173429 A CN201610173429 A CN 201610173429A CN 105753236 B CN105753236 B CN 105753236B
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waste water
added
metronidazole
sulfuric acid
gross mass
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CN105753236A (en
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方耀
徐双喜
晏浩哲
喻莎莎
方高
丰光俊
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HUBEI HONGYUAN PHARMACEUTICAL TECHNOLOGY Co Ltd
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HUBEI HONGYUAN PHARMACEUTICAL TECHNOLOGY Co Ltd
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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
    • 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
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • C02F1/22—Treatment of water, waste water, or sewage by freezing
    • 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
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46176—Galvanic cells
    • 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
    • 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
    • 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
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • 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
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Physical Water Treatments (AREA)

Abstract

The invention belongs to Industrial Wastewater Treatment and recovery technology field, it is related to a kind of processing method of economic benefits and social benefits condensed water in metronidazole waste water, comprising: the cooling centrifugal treating to the centrifuge waste water being centrifuged three times in metronidazole production process；Distillate is obtained by vacuum distillation to the mother liquor after centrifugation；Adjust distillate PH=3 with sulfuric acid, and after sequentially adding H2O2, O3, add iron powder and active carbon be stirred to react after filter, adjust PH to 3；FeSO4 is added, after FeSO4 is completely dissolved, H202, filtering is added；After potassium bichromate solution mixing is added into filtrate, then each AgSO4-H2SO4 solution that is added mixes, and clears up 15min at 165 DEG C.It can remove in metronidazole waste water treatment process about 75% condensed water.

Description

The processing method of economic benefits and social benefits condensed water in a kind of metronidazole waste water
Technical field
The present invention relates to a kind of processing methods of economic benefits and social benefits condensed water in metronidazole waste water, belong to Industrial Wastewater Treatment and return It receives.
Background technique
With the development of chemical and medicine industry industry, the processing cost for a large amount of waste water that chemical industry, pharmacy corporation generate in production, Have become one of the production cost of enterprise-essential.Due to needing during medication chemistry produces using plurality of raw materials, and Waste water composition complex, pharmaceutical wastewater become one of waste water difficult to deal with.Especially in antibiotics production process [unclear] organic wastewater more containing biotoxins such as with high salt, high chroma, hard-degraded substances generated.
Metronidazole is a kind of antibiotic bulk pharmaceutical chemicals less expensive in medicinal industry, mainly using cyclization, oxidation, nitrification, The chemical methodes such as addition make a variety of industrial chemicals through multistep complex chemical reaction, produce required medicine intermediate and synthesis Bulk pharmaceutical chemicals.It needs largely to use plurality of raw materials in production process, technique more at present is done using 2- 5-nitro imidazole Raw material, formic acid and sulfuric acid occur addition reaction and are obtained by neutralizing and separating three times as under conditions of solvent with ethylene oxide To metronidazole finished product.
But a large amount of waste water can be generated during producing metronidazole, containing there are many raw materials not reacted completely in waste water And reaction product, it mainly include raw materials and other organic matters, salt (production technology such as 2- 5-nitro imidazole, formic acid The sal glauberi of middle generation) etc., it would seriously pollute the environment.
Organic matter in metronidazole waste water contains imidazole ring class antibiotic, ethylene glycol, the larger molecular organics such as polyethylene glycol, It forms extremely complex.If direct emission, it is easy to cause the eutrophication of water body, a variety of pernicious gases is decomposited, not only causes Serious water pollution can also pollute air；A large amount of inorganic salts can make water pH value change in waste water, and it is naturally slow to destroy it Punching effect, the growth for eliminating or inhibiting bacterium and microorganism, hinder self-purification of waters, while can greatly increase the hardness of water, Cause the salinization of soil.
And these inorganic salts and organic matter (ethylene glycol, polyethylene glycol) are difficult to handle if using single processing method For qualified discharge water adverse effect can be all brought to industry and life if direct emission.
Summary of the invention
The present invention provides a kind of first aiming at the problem that economic benefits and social benefits condensed water is not handled by existing metronidazole production process The processing method of economic benefits and social benefits condensed water, can remove in metronidazole waste water treatment process about 75% condensed water in nitre azoles waste water.
The present invention is the technical solution realizing technical purpose and using are as follows:
The processing method of economic benefits and social benefits condensed water in a kind of metronidazole waste water, comprising the following steps:
Step 1: taking the centrifuge waste water being centrifuged three times in metronidazole production process, -5 DEG C~5 DEG C are cooled to, centrifugation is passed through It is separated by solid-liquid separation, and removes isolated clear crystal, take mother liquor；
Step 2: taking step 1 mother liquor by vacuum distillation, vacuum degree -0.085~-0.075MPa, bath temperature are controlled 60~90 DEG C, the 3/4~3/5 of taken wastewater sample gross mass is steamed, distillate gives over to be handled in next step；
Step 3: with two distillate of concentrated sulfuric acid regulating step to pH=3, and be added the 2.0%~5% of waste water gross mass H2O2, then it is passed through O340min controls O3Be passed through 120~160mg/min of speed, after placing 30min, obtained mixed liquor is stayed Make to handle in next step；
Step 4: sequentially adding the iron powder and waste water of waste water gross mass 5.0%~8% into mixed liquor obtained in step 3 The active carbon of gross mass 5.0%~8% filters after being stirred to react 2h, and to filtered filtrate tune pH to 3, obtained mixed liquor is stayed Make to handle in next step；
Step 5: 1.0%~2.5% FeSO of waste water total amount is added into mixed liquor described in step 44, to FeSO4Completely After dissolution, the H of waste water gross mass 0.5%~2.5% is added202, wherein H202Mass fraction be 30%；After being stirred to react 2h, adjust PH to 10~10.5；Solid is filtered off, filtrate is obtained and gives over to processing in next step；
Step 6: 1.5%~3.0% potassium bichromate solution of waste water gross mass is added into filtrate described in step 5, mix Uniformly, the Ag of waste water gross mass 8.0%~12% is added2SO4-H2SO4Solution, wherein Ag2SO4-H2SO4Solution is that every 100ml is dense Dissolved with 1gAg in sulfuric acid2SO4；After mixing evenly, 0.5~1.5h is cleared up at 165 DEG C, it is cooling；Measure COD.
As the improved technical solution of the present invention, in step 1, metronidazole three times centrifuge waste water using being evaporated under reduced pressure What mode was handled
As the improved technical solution of the present invention, the concentrated sulfuric acid is the sulfuric acid of mass fraction 98% in step 3；
As the improved technical solution of the present invention, H in step 32O2The hydrogen peroxide for being 28%~30% for mass fraction is molten Liquid.
The condensation water process qualification that metronidazole waste water distills can be reached into country's discharge mark according to the method described above It is quasi-.
Advantages and beneficial effects of the present invention essentially consist in:
Metronidazole produces in waste water containing there are many pollutant, can be with by producing the pretreatment of waste water to metronidazole Pollution is reduced, environment is protected；
Organic matter in metronidazole waste water contains the larger molecular organics such as imidazole ring class antibiotic, ethylene glycol, polyethylene glycol, Form it is extremely complex, if these organic matters such as ethylene glycol, polyethylene glycol, imidazole ring class antibiotic etc. are using single processing side Method, being difficult processing is qualified discharge water, if direct emission, can all bring adverse effect to industry and life, in the present invention The method combined using physical chemistry can be evaporating so that the organic matter in metronidazole waste water is quickly and effectively handled Point about 75% wastewater treatment to COD be 500mg/L or less.
Distillate pH=3 are adjusted with the concentrated sulfuric acid in step three of the invention, and H is added2O2, can be with having in oxidized waste water Machine object；It is passed through O3, a certain amount of free radical can be generated with hydrogen peroxide, and make H2O2-O3The oxidizing potential of system increases, Larger molecular organics can be degraded to small organic molecule, solve problem for the water process of next step.Add in step 4 Enter the solution after iron powder and activated carbon in equal amount to ozonization, micro cell effect can be formed, accelerates organic matter and oxygen occurs Change electron transfer speed when reduction, the decomposition rate of larger molecular organics can be accelerated.
In addition, reaction condition is mild in this method, gas flow rate is low, and main reactant is liquid, easy to operate；It is above-mentioned Agents useful for same is common agents, cheap, and cost is relatively low.
Specific embodiment:
To keep purpose and the technical solution of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention to this hair Bright technical solution is clearly and completely described.Obviously, described embodiment is a part of the embodiments of the present invention, and The embodiment being not all of.Based on described the embodiment of the present invention, those of ordinary skill in the art are without creative labor Every other embodiment obtained under the premise of dynamic, shall fall within the protection scope of the present invention.
Embodiment 1:
The centrifuge waste water being centrifuged three times in 200ml metronidazole production process is taken, is cooled to -5 DEG C, is centrifuged, is separated by solid-liquid separation, removes The clear crystal 20g in mother liquor is removed, clear crystal is five or six sodium sulfate crystals after tested；Wherein, metronidazole centrifuge waste water three times It is to be handled by the way of vacuum distillation；It takes mother liquor by vacuum distillation, controls vacuum degree -0.075MPa, water-bath temperature It is evaporated under reduced pressure at 90 DEG C of degree, until distillate V1=120ml；Distillate is adjusted to pH=3 with the concentrated sulfuric acid, and the H of 10ml is added2O2, Then pass to O3, after placing 30min；Here O3A length of 40min when being passed through, is passed through speed 160mg/min；Hydrogen peroxide is quality The hydrogenperoxide steam generator that score is 28%~30%；Obtained mixed liquor gives over to be handled in next step；Here the concentrated sulfuric acid is mass fraction 98% sulfuric acid；
The 16g iron powder and 16g active carbon of waste water gross mass are added into mixed liquor, is filtered after being stirred to react 2h, adjusts filtrate PH to 3；Obtained mixed liquor gives over to be handled in next step；The FeSO of the 5g of waste water total amount is added into mixed liquor4, to FeSO4Completely After dissolution, the H that 5ml mass fraction is 30% is added202；After being stirred to react 2h, pH to 10 is adjusted；Filtering filters off solid, obtains filtrate It gives over to and handles in next step；After the 6ml potassium bichromate solution mixing of waste water gross mass is added into filtrate, add 24ml's Ag2SO4-H2SO4Solution stirs evenly, and 15min is cleared up at 165 DEG C, cooling；Measurement COD is 156mg/L；Wherein Ag2SO4- H2SO4Solution is in every 100ml concentrated sulfuric acid dissolved with 1gAg2SO4。
Embodiment 2:
The centrifuge waste water being centrifuged three times in 200ml metronidazole production process is taken, is cooled to -3 DEG C, is centrifuged, is separated by solid-liquid separation, removes The clear crystal 18g in mother liquor is removed, clear crystal is five or six sodium sulfate crystals after tested；Wherein, metronidazole centrifuge waste water three times It is to be handled by the way of vacuum distillation；It takes mother liquor by vacuum distillation, controls vacuum degree -0.075MPa, water-bath temperature It is evaporated under reduced pressure at 60 DEG C of degree, until distillate V1=120ml；Distillate is adjusted to pH=3 with the concentrated sulfuric acid, and the H of 4ml is added2O2, Then pass to O3, after placing 30min；Here O3A length of 30min when being passed through, is passed through speed 120mg/min；Hydrogen peroxide is quality The hydrogenperoxide steam generator that score is 30%；Obtained mixed liquor gives over to be handled in next step；Here the concentrated sulfuric acid is mass fraction 98% Sulfuric acid；The 10g iron powder and 10g active carbon of waste water gross mass are added into mixed liquor, is filtered after being stirred to react 2h, adjusts filtrate pH extremely 3；Obtained mixed liquor gives over to be handled in next step；The FeSO of the 2g of waste water total amount is added into mixed liquor4, to FeSO4It is completely dissolved Afterwards, the H that 1ml mass fraction is 30% is added202；After being stirred to react 2h, pH to 10 is adjusted；Filtering filters off solid, obtains filtrate and give over to It handles in next step；After the 3ml potassium bichromate solution mixing of waste water gross mass is added into filtrate, the Ag of 16ml is added2SO4- H2SO4Solution stirs evenly, and 15min is cleared up at 165 DEG C, cooling；Measurement COD is 356mg/L；Wherein Ag2SO4-H2SO4Solution For in every 100ml concentrated sulfuric acid dissolved with 1gAg2SO4。
Embodiment 3:
The centrifuge waste water being centrifuged three times in 200ml metronidazole production process is taken, is cooled to -4 DEG C, is centrifuged, is separated by solid-liquid separation, removes The clear crystal 19g in mother liquor is removed, clear crystal is five or six sodium sulfate crystals after tested；Wherein, metronidazole centrifuge waste water three times It is to be handled by the way of vacuum distillation；It takes mother liquor by vacuum distillation, controls vacuum degree -0.080MPa, water-bath temperature It is evaporated under reduced pressure at 90 DEG C of degree, until distillate V1=135ml；Distillate is adjusted to pH=3 with the concentrated sulfuric acid, and the H of 7ml is added2O2, Then pass to O3, after placing 30min；Here O3A length of 30min when being passed through, is passed through speed 140mg/min；Hydrogen peroxide is quality The hydrogenperoxide steam generator that score is 30%；Obtained mixed liquor gives over to be handled in next step；Here the concentrated sulfuric acid is mass fraction 98% Sulfuric acid；The 13g iron powder and 13g active carbon of waste water gross mass are added into mixed liquor, is filtered after being stirred to react 2h, adjusts filtrate pH extremely 3；Obtained mixed liquor gives over to be handled in next step；The FeSO of the 3.5g of waste water total amount is added into mixed liquor4, to FeSO4It is completely molten The H that 3ml mass fraction is 30% is added in Xie Hou202；After being stirred to react 2h, pH to 10 is adjusted；Filtering filters off solid, obtains filtrate and stay Make to handle in next step；After the 4.5ml potassium bichromate solution mixing of waste water gross mass is added into filtrate, add 20ml's Ag2SO4-H2SO4Solution stirs evenly, and 15min is cleared up at 165 DEG C, cooling；Measurement COD is 178mg/L；Wherein Ag2SO4- H2SO4Solution is in every 100ml concentrated sulfuric acid dissolved with 1gAg2SO4。
Embodiment 4:
The centrifuge waste water being centrifuged three times in 200ml metronidazole production process is taken, is cooled to -2 DEG C, is centrifuged, is separated by solid-liquid separation, removes The clear crystal 18.2g in mother liquor is removed, clear crystal is five or six sodium sulfate crystals after tested；Wherein, metronidazole is centrifuged useless three times Water is handled by the way of vacuum distillation；It takes mother liquor by vacuum distillation, controls vacuum degree -0.085MPa, water-bath It is evaporated under reduced pressure under temperature 70 C, until distillate V1=142ml；Distillate is adjusted to pH=3 with the concentrated sulfuric acid, and is added 9ml's H2O2, then pass to O3, after placing 30min；Here a length of 30min when O3 is passed through, is passed through speed 150mg/min；Hydrogen peroxide is The hydrogenperoxide steam generator that mass fraction is 30%；Obtained mixed liquor gives over to be handled in next step；Here the concentrated sulfuric acid is mass fraction 98% sulfuric acid；The 14g iron powder and 14g active carbon of waste water gross mass are added into mixed liquor, is filtered after being stirred to react 2h, adjusts filter Liquid pH to 3；Obtained mixed liquor gives over to be handled in next step；The FeSO of the 4g of waste water total amount is added into mixed liquor4, to FeSO4It is complete After fully dissolved, the H that 4ml mass fraction is 30% is added202；After being stirred to react 2h, pH to 10 is adjusted；Filtering filters off solid, is filtered Liquid gives over to be handled in next step；After the 5ml potassium bichromate solution mixing of waste water gross mass is added into filtrate, add 18ml's Ag2SO4-H2SO4Solution stirs evenly, and 15min is cleared up at 165 DEG C, cooling；Measurement COD is 189mg/L；Wherein Ag2SO4- H2SO4Solution is in every 100ml concentrated sulfuric acid dissolved with 1gAg2SO4。
Embodiment 5:
The centrifuge waste water being centrifuged three times in 200ml metronidazole production process is taken, is cooled to -1 DEG C, is centrifuged, is separated by solid-liquid separation, removes The clear crystal 17g in mother liquor is removed, clear crystal is five or six sodium sulfate crystals after tested；Wherein, metronidazole centrifuge waste water three times It is to be handled by the way of vacuum distillation；It takes mother liquor by vacuum distillation, controls vacuum degree -0.082MPa, water-bath temperature It is evaporated under reduced pressure at 90 DEG C of degree, until distillate V1=138ml；Distillate is adjusted to pH=3 with the concentrated sulfuric acid, and the H of 9ml is added2O2, Then pass to O3, after placing 30min；Here O3A length of 30min when being passed through, is passed through speed 142mg/min；Hydrogen peroxide is quality The hydrogenperoxide steam generator that score is 30%；Obtained mixed liquor gives over to be handled in next step；Here the concentrated sulfuric acid is mass fraction 98% Sulfuric acid；The 12g iron powder and 12g active carbon of waste water gross mass are added into mixed liquor, is filtered after being stirred to react 2h, adjusts filtrate pH extremely 3；Obtained mixed liquor gives over to be handled in next step；The FeSO of the 4g of waste water total amount is added into mixed liquor4, to FeSO4It is completely dissolved Afterwards, the H that 4ml mass fraction is 30% is added202；After being stirred to react 2h, pH to 10 is adjusted；Filtering filters off solid, obtains filtrate and give over to It handles in next step；After the 5ml potassium bichromate solution mixing of waste water gross mass is added into filtrate, the Ag of 24ml is added2SO4- H2SO4Solution stirs evenly, and 15min is cleared up at 165 DEG C, cooling；Measurement COD is 156mg/L；Wherein Ag2SO4-H2SO4Solution For in every 100ml concentrated sulfuric acid dissolved with 1gAg2SO4。
Embodiment 6:
The centrifuge waste water being centrifuged three times in 200ml metronidazole production process is taken, is cooled to 2 DEG C, is centrifuged, is separated by solid-liquid separation, removes The clear crystal 15g in mother liquor is removed, clear crystal is five or six sodium sulfate crystals after tested；Wherein, metronidazole centrifuge waste water three times It is to be handled by the way of vacuum distillation；It takes mother liquor by vacuum distillation, controls vacuum degree -0.078MPa, water-bath temperature It is evaporated under reduced pressure at 90 DEG C of degree, until distillate V1=140ml；Distillate is adjusted to pH=3 with the concentrated sulfuric acid, and the H of 10ml is added2O2, Then pass to O3, after placing 30min；Here O3A length of 30min when being passed through, is passed through speed 150mg/min；Hydrogen peroxide is quality The hydrogenperoxide steam generator that score is 30%；Obtained mixed liquor gives over to be handled in next step；Here the concentrated sulfuric acid is mass fraction 98% Sulfuric acid；The 13g iron powder and 13g active carbon of waste water gross mass are added into mixed liquor, is filtered after being stirred to react 2h, adjusts filtrate pH extremely 3；Obtained mixed liquor gives over to be handled in next step；The FeSO of the 5g of waste water total amount is added into mixed liquor4, to FeSO4It is completely dissolved Afterwards, the H that 3ml mass fraction is 30% is added202；After being stirred to react 2h, pH to 10 is adjusted；Filtering filters off solid, obtains filtrate and give over to It handles in next step；After the 4ml potassium bichromate solution mixing of waste water gross mass is added into filtrate, the Ag of 22ml is added2SO4- H2SO4Solution stirs evenly, and 15min is cleared up at 165 DEG C, cooling；Measurement COD is 250mg/L；Wherein Ag2SO4-H2SO4Solution For in every 100ml concentrated sulfuric acid dissolved with 1gAg2SO4。
The above is only embodiments of the present invention, and the description thereof is more specific and detailed, and but it cannot be understood as right The limitation of the invention patent range.It should be pointed out that for those of ordinary skill in the art, not departing from the present invention Under the premise of design, various modifications and improvements can be made, these are all belonged to the scope of protection of the present invention.

Claims (4)

1. the processing method of economic benefits and social benefits condensed water in a kind of metronidazole waste water, which comprises the following steps:
Step 1: taking the centrifuge waste water being centrifuged three times in metronidazole production process, -5 DEG C~5 DEG C are cooled to, is carried out by centrifugation It is separated by solid-liquid separation, and removes isolated clear crystal, take mother liquor；
Step 2: take step 1 mother liquor by being evaporated under reduced pressure, control vacuum degree -0.085~-0.075MPa, bath temperature 60~ 90 DEG C, the 3/4~3/5 of taken wastewater sample gross mass is steamed, distillate gives over to be handled in next step；
Step 3: with two distillate of concentrated sulfuric acid regulating step to pH=3, and 2.0%~5% H of waste water gross mass is added2O2, then It is passed through O340min controls O3Be passed through 120~160mg/min of speed, after placing 30min, obtained mixed liquor is given over to next Step processing；
Step 4: sequentially adding the iron powder and the total matter of waste water of waste water gross mass 5.0%~8% into mixed liquor obtained in step 3 The active carbon of amount 5.0%~8%, is filtered, to filtered filtrate tune pH to 3, obtained mixed liquor is given over to down after being stirred to react 2h The processing of one step；
Step 5: 1.0%~2.5% FeSO of waste water total amount is added into mixed liquor described in step 44, to FeSO4It is completely dissolved Afterwards, the H of waste water gross mass 0.5%~2.5% is added2O2, wherein H2O2Mass fraction be 30%；After being stirred to react 2h, pH is adjusted To 10~10.5；Solid is filtered off, filtrate is obtained and gives over to processing in next step；
Step 6: 1.5%~3.0% potassium bichromate solution of waste water gross mass is added into filtrate described in step 5, it is mixed evenly, Add the Ag of waste water gross mass 8.0%~12%2SO4-H2SO4Solution, wherein Ag2SO4-H2SO4Solution is every 100ml concentrated sulfuric acid In dissolved with 1gAg2SO4；After mixing evenly, 0.5~1.5h is cleared up at 165 DEG C, it is cooling；Measure COD.
2. processing method according to claim 1, it is characterised in that: in step 1, centrifuge waste water is using vacuum distillation Mode handle.
3. processing method according to claim 1, it is characterised in that: the concentrated sulfuric acid is mass fraction 98% in step 3 Sulfuric acid.
4. processing method according to claim 1, it is characterised in that: H in step 32O2For mass fraction be 28%~ 30% hydrogenperoxide steam generator.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597116A (en) * 2009-04-27 2009-12-09 江苏隆昌化工有限公司 A kind of 2,5-dichloronitrobenzene waste water treatment process
CN102363546A (en) * 2011-06-20 2012-02-29 上海明诺环境科技有限公司 High salinity pharmaceutical wastewater processing system
CN103880235A (en) * 2014-04-16 2014-06-25 湖北省宏源药业有限公司 Treatment method for dimetronidazole production wastewater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597116A (en) * 2009-04-27 2009-12-09 江苏隆昌化工有限公司 A kind of 2,5-dichloronitrobenzene waste water treatment process
CN102363546A (en) * 2011-06-20 2012-02-29 上海明诺环境科技有限公司 High salinity pharmaceutical wastewater processing system
CN103880235A (en) * 2014-04-16 2014-06-25 湖北省宏源药业有限公司 Treatment method for dimetronidazole production wastewater

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