CN110066077A - A kind of processing method of cymoxanil agricultural chemicals waste water - Google Patents
A kind of processing method of cymoxanil agricultural chemicals waste water Download PDFInfo
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- CN110066077A CN110066077A CN201910499562.8A CN201910499562A CN110066077A CN 110066077 A CN110066077 A CN 110066077A CN 201910499562 A CN201910499562 A CN 201910499562A CN 110066077 A CN110066077 A CN 110066077A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/50—Nitrous acid; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
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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
- C02F1/72—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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/306—Pesticides
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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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The present invention relates to sewage advanced treatment fields, provide a kind of processing method of cymoxanil agricultural chemicals waste water, comprising the following steps: 1), using solid sodium hydroxide to cymoxanil waste water carry out alkali tune processing;2), after alkali tune, powdered active carbon is added into waste water, stainless steel forms three-dimensional electric grade as anode material and carry out electrolytic catalysis reaction to waste water as cathode, graphite;3) it, after electrocatalytic reaction, stands and filters, the acidity of sulfuric acid regulation solution is used after filtering;4) after the completion of, strengthening Fenton's reaction, iron powder is first recovered by filtration, tune pH stands after being 8 ~ 9, takes supernatant to enter pre-heating system, waste water is conveyed into evaporator and is evaporated;5), by the fraction in evaporation process using biochemical treatment is carried out after the water outlet dilution of A/O biochemical system, the waste water after A/O biochemical treatment is directly entered garden pipe network system;6) the Liquid Residue centrifugation after, evaporating, is dried to obtain sodium chloride, sodium nitrite, sodium sulphate product;7) remaining Liquid Residue, is subjected to high-temp combustion, waste heat is recycled.
Description
Technical field
The invention belongs to agricultural chemicals waste water processing technique, in particular to a kind of processing method of cymoxanil agricultural chemicals waste water.
Background technique
The development of modern agriculture promotes the increasingly all of agricultural chemicals waste water yield to increase.Agricultural chemicals waste water contains a large amount of venomous injurants
Matter has higher toxicity to aquatile, and direct emission not only results in the death of aquatile, but also can further permeate
Underground water and soil are entered, human health is caused potentially to threaten, therefore is very crucial to effective improvement of agricultural chemicals waste water.
Cymoxanil is a kind of fungicide efficiently, less toxic, is had to Peronosporales fungi (Phytophthora, Peronospora, Plasmopara)
Effect, is widely used in the brassicaceous vegetables and tobacco etc. such as cucumber, grape, tomato, lichee, huge dish.Cymoxanil is multiple because of production technology
It is miscellaneous, Various Complex composition, including monoxone, cyanoacetic acid (micro), acetic acid, sodium chloride, N- ethyl carbamide, cyanogen acetyl are contained in waste water
Base ethyl carbamide, methoxy sodium sulfonate, 2- cyano -2- oximinoacetamide, cymoxanil etc..Cymoxanil waste water because salt content is big, coloration
Greatly and the CN containing higher concentration—, it is difficult to directly biodegrade.Processing for such agricultural chemicals waste water, usual method are to utilize
Including the common materialized pretreatment method such as micro-electrolysis method, advanced oxidation processes, light electrolysis+advanced oxidation processes group technology, by portion
Hardly degraded organic substance is divided to be converted into easily biodegradable organics, then carrying out subsequent wastewater treatment using biochemical treatment expires final outflow water
Sufficient discharge standard.But the problems such as existing method is unobvious and unstable, reagent consumption is more there are treatment effect, while waste water
The characteristics of middle high salt concentration, also hinders waste water to carry out biochemical treatment.
The processing method of (CN201010561525 .4) imidacloprid pesticide wastewater, this application are disclosed in existing technology
The preprocess method of case is chemical dephosphorization, Fe-C light electrolysis, the group technology of Fenton oxidation and catalysis oxidation, the pretreatment work
Skill can effectively reduce wastewater organic pollutant concentration, however should be limited by COD concentration, there is processing when waste water COD is higher
The dissatisfactory defect of effect.Number of patent application CN201710201176 .7 is provided a kind of using by Titanium base and being covered in
The method that the electrode of the metal oxide layer composition on Titanium base surface carries out agricultural chemicals waste water processing, metal oxide layer is by aoxidizing
Platinum, tin oxide and antimony oxide composition, such processing method electrode material requirement is high, increases cost for wastewater treatment, it is difficult to big
Scale engineering application.The extracting method of inorganic salts and the resource utilization method of industrial wastewater in a kind of industrial wastewater
(CN103224261 B), including industrial wastewater is concentrated by evaporation, solid inorganic salt is obtained, solid inorganic salt is being less than or equal to
It is contacted at a temperature of 1000 DEG C with oxygen-containing gas, be carbonized to obtain high purity inorganic salt.The salt that the patent obtains still belongs to mixing
Salt can not directly carry out resource utilization.The wastewater treatment method announced in the prior art is varied, however is directed to
COD value is high in cymoxanil waste water, and the high feature of salinity, how to develop one kind makes waste water energy reach emission request,
And salt resource is recycled, become cymoxanil waste water technical problem to be solved.
Summary of the invention
The object of the present invention is to high for COD value in cymoxanil waste water, the high feature of salinity, the present invention is provided
A kind of processing method of cymoxanil agricultural chemicals waste water.Materialization pretreatment method is coupled biochemical method by it, and will by MVR evaporator
The two connection combination, it is desirable to provide one kind makes waste water energy reach emission request, and is recycled to salt resource efficient, steady
Fixed, economy, recycling integrated processing method.
To solve the above-mentioned problems, The technical solution adopted by the invention is as follows: a kind of processing side of cymoxanil agricultural chemicals waste water
Method, according to sequencing the following steps are included:
1) cymoxanil waste water, is delivered to waste water reactor, and alkali tune processing is carried out to waste water using solid sodium hydroxide, makes it
PH is 9 ~ 11;
2), after alkali tune, powdered active carbon, the additional amount of the active carbon are added into waste water are as follows: 0.03-0.05g/mL is stirred
Mixing is mixed, stainless steel forms three-dimensional electric grade as anode material and carry out electrolytic catalysis reaction, reaction to waste water as cathode, graphite
Time is 3 ~ 4h;
3) it, after cell reaction, stands and filters, the acidity of sulfuric acid regulation solution is used after filtering, makes its pH 3 ~ 5, be added
Iron powder carries outStrengthen Fenton's reactionAfter 2 ~ 3h, ferrous sulfate heptahydrate and 30%(V/V are sequentially added) hydrogen peroxide, maintain the temperature of reaction
Degree is 50 ~ 60 DEG C, and the reaction time is 3 ~ 4h;
4) after the completion of, strengthening Fenton's reaction, after iron powder first is recovered by filtration, the alkalinity of sodium hydrate regulator solution is recycled, it is made
PH is 8 ~ 10, filters after standing, takes supernatant to enter pre-heating system, be increased to 50-60 degrees Celsius to temperature, by waste water convey into
Evaporator is evaporated;
5), the fraction in evaporation process is diluted using the water outlet of A/O biochemical system,Fraction concentration after dilution is 1200-1500 mg/L,Biochemical treatment is carried out into level-one A/O biochemical treatment system,Waste water after A/O biochemical treatmentDirectly into
Enter garden pipe network system;
6) Liquid Residue after, evaporating first directly is centrifuged, and is dried to obtain sodium chloride product, the further crystallisation by cooling of Liquid Residue to be evaporated
It is centrifuged again after to 38 ~ 43 DEG C, obtains nitrous acid product, crystallisation by cooling obtains sodium sulphate production to centrifugation after 18 ~ 23 DEG C again
Product;
7) it, will be centrifuged remaining Liquid Residue twice and enter the burning of high-temp combustion device, the waste heat after high temperature will be recycled,
ForIt maintains to strengthen Fenton's reactionTemperature and pre-heating system.
Further improved to be: evaporator is MVR evaporator.
Further improved to be: the evaporating temperature in the step 4) in evaporation process is 100 ~ 110 DEG C.
Further improved to be: the electro-catalysis electric current of three-dimensional electricity grade electrolytic catalysis reaction is 1 ~ 2A, electricity in the step 2
Catalysis voltage is 3.5 ~ 5.0V.
Further improved to be: the additional proportion of every liter of liquid iron powder is 7 ~ 10g, the concentration of hydrogen peroxide in the step 3)
It is 1% ~ 3%, the concentration ratio of ferrous sulfate heptahydrate and hydrogen peroxide is 1:3 ~ 5.
The utility model has the advantages that
Compared to the prior art compared with the beneficial effects of the present invention are as follows: the integrated pretreatment of highly concentrated high-toxic pesticide waste water of the invention
Method, according to waste water characteristic, more from hardly degraded organic substance first, type complexity characteristic is started with, and is coupled using three-diemsnional electrode strong
The feature that non-selectivity, the oxidative degradation ability of change Fenton's reaction are strong acts on the hardly degraded organic substance in waste water first, makes to give up
A large amount of hardly degraded organic substances are significantly cut down in water, are further decreased COD value using flocculation sedimentation effect, are increased substantially
The biodegradability of waste water, while MVR evaporator and multiple centrifugal devices are utilized, also to the salt in waste water while energy saving
It is recycled, also carries out the requirement of recycling treatment to waste water while guaranteeing to reach biochemical system processing requirement.It is whole
A processing method is stable, reliable and be easily achieved, be easy to operate, in terms of high COD, with high salt, high-toxic pesticide wastewater treatment
It is with a wide range of applications.
During strengthening Fenton's reaction, also further rear while substance of the iron powder of addition in recall reducing waste water
Continuous Fenton's reaction serves as catalyst, and synergistic oxidation organic matter accelerates reaction rate, reduces reaction volume, and reduce Fenton's reaction
Added amount of chemical, improve remove organic matter efficiency when also save Fenton reagent, saved operating cost.
In electrolytic catalysis reaction, active carbon is added, is utilized respectively stainless steel and graphite as cathode and anode material, shape
At three-diemsnional electrode electro-catalysis reducing process, not only increase the effective area of electrolysis, but also it is organic directly to degrade by electrode reaction
Object, or generating hydroxyl radical free radical, ozone etc. by electrode reaction has the intermediary of strong oxidizing property come degradation of organic substances, mentions significantly
High electrolytic efficiency.
Temperature is maintained 100 ~ 110 DEG C in evaporation process, using MVR evaporator, efficiently utilizes secondary steam energy, mentions
High evaporation efficiency reduces the energy consumption in evaporation process.
Evaporator couples centrifugal device, carries out recycling treatment to the salt in agricultural chemicals waste water, recycles sodium chloride, nitrous acid
Sodium product and sodium sulphate product.
During strengthening Fenton's reaction, the temperature of Fenton's reaction is maintained using evaporation Liquid Residue burning gained heat, is returned
The heat that high temperature burning handling Liquid Residue generates is received, cost has been saved.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the processing method of cymoxanil agricultural chemicals waste water of the embodiment of the present invention.
Specific embodiment
Embodiment one:
As shown in Figure 1, the embodiment of the present invention one discloses a kind of processing method of cymoxanil agricultural chemicals waste water, include according to sequencing
Following steps:
1) cymoxanil waste water, is delivered to waste water reactor, and alkali tune processing is carried out to waste water using solid sodium hydroxide, makes it
PH is 10;
2), after alkali tune, powdered active carbon, the additional amount of the active carbon are added into waste water are as follows: 0.03g/mL, stirring are mixed
Even, as cathode, graphite forms three-dimensional electric grade as anode material and carries out electrocatalytic reaction to waste water stainless steel, and the reaction time is
3h;Electro-catalysis electric current is 1.5A, and electro-catalysis voltage is 3.5V;
3) it, after cell reaction, stands and filters, the acidity of sulfuric acid regulation solution is used after filtering, make its pH 3, iron is added
Powder carries outStrengthen Fenton's reactionAfter 2h, sequentially add ferrous sulfate heptahydrate and 30%(V/V) hydrogen peroxide, maintain reaction temperature be
50 DEG C, reaction time 3h;The additional proportion of every liter of liquid iron powder is 8g, and the concentration of hydrogen peroxide is 1% ~ 3%, ferrous sulfate heptahydrate
Concentration ratio with hydrogen peroxide is 1:3 ~ 5;
4) after the completion of, strengthening Fenton's reaction, after iron powder first is recovered by filtration, the alkalinity of sodium hydrate regulator solution is recycled, it is made
PH is 8, filters after standing, supernatant is taken to enter pre-heating system, is increased to 50-60 DEG C to temperature, and waste water is conveyed into MVR and is evaporated
Device is evaporated;Evaporating temperature in evaporation process is 100 ~ 110 DEG C.
5), the fraction in evaporation process is diluted using the water outlet of A/O biochemical system,Fraction concentration after dilution is 1200-1500 mg/L,Biochemical treatment is carried out into level-one A/O biochemical treatment system,Waste water after A/O biochemical treatmentDirectly into
Enter garden pipe network system;
6) Liquid Residue after, evaporating first directly is centrifuged, and is dried to obtain sodium chloride product, the further crystallisation by cooling of Liquid Residue to be evaporated
It is centrifuged again after to 40 DEG C, obtains sodium nitrite product, crystallisation by cooling obtains sodium sulphate product to centrifugation after 20 DEG C again;
7) it, will be centrifuged remaining Liquid Residue twice and enter the burning of high-temp combustion device, the waste heat after high temperature will be recycled,
ForIt maintains to strengthen Fenton's reactionTemperature and pre-heating system.
Embodiment two:
As shown in Figure 1, the embodiment of the present invention two discloses a kind of processing method of cymoxanil agricultural chemicals waste water, include according to sequencing
Following steps:
1) cymoxanil waste water, is delivered to waste water reactor, and alkali tune processing is carried out to waste water using solid sodium hydroxide, makes it
PH is 9;
2), after alkali tune, powdered active carbon, the additional amount of the active carbon are added into waste water are as follows: 0.04g/mL, stirring are mixed
Even, stainless steel forms three-dimensional electric grade as anode material and carries out electrolytic catalysis reaction, reaction time to waste water as cathode, graphite
For 3.5h;Electro-catalysis electric current is 2A, and electro-catalysis voltage is 4V;
3) it, after cell reaction, stands and filters, the acidity of sulfuric acid regulation solution is used after filtering, make its pH 4, iron is added
Powder carries outStrengthen Fenton's reactionAfter 3h, sequentially add ferrous sulfate heptahydrate and 30%(V/V) hydrogen peroxide, maintain reaction temperature be
55 DEG C, reaction time 3h;The additional proportion of every liter of liquid iron powder is 10g, and the concentration of hydrogen peroxide is 1% ~ 3%, and seven water sulfuric acid are sub-
The concentration of iron and hydrogen peroxide ratio is 1:3 ~ 5;
4) after the completion of, strengthening Fenton's reaction, after iron powder first is recovered by filtration, the alkalinity of sodium hydrate regulator solution is recycled, it is made
PH is 10, filters after standing, supernatant is taken to enter pre-heating system, is increased to 50-60 DEG C to temperature, and waste water is conveyed into MVR and is steamed
Hair device is evaporated;Evaporating temperature in evaporation process is 100 ~ 110 DEG C.
5), the fraction in evaporation process is diluted using the water outlet of A/O biochemical system,After dilutionFractionConcentration is 1200-1500mg/L,Biochemical treatment is carried out into level-one A/O biochemical treatment system,Waste water after A/O biochemical treatmentIt is directly entered
Garden pipe network system;
6) Liquid Residue after, evaporating first directly is centrifuged, and is dried to obtain sodium chloride product, the further crystallisation by cooling of Liquid Residue to be evaporated
It is centrifuged again after to 43 DEG C, obtains sodium nitrite product, crystallisation by cooling obtains sodium sulphate product to centrifugation after 23 DEG C again;
7) it, will be centrifuged remaining Liquid Residue twice and enter the burning of high-temp combustion device, the waste heat after high temperature will be recycled,
ForIt maintains to strengthen Fenton's reactionTemperature and pre-heating system.
The integrated preprocess method of highly concentrated high-toxic pesticide waste water of the invention has from difficult to degrade first according to waste water characteristic
Machine object is more, type complexity characteristic is started with, and utilizes the non-selectivity of three-diemsnional electrode coupling and intensifying Fenton's reaction, oxidative degradation ability
Strong feature acts on the hardly degraded organic substance in waste water first, cuts a large amount of hardly degraded organic substances in waste water significantly
Subtract, further decreases COD value using flocculation sedimentation effect, increase substantially the biodegradability of waste water, while utilizing MVR evaporator
With multiple centrifugal devices, also the salt in waste water is recycled while energy saving, is guaranteeing to reach biochemical system
The requirement of recycling treatment is also carried out while processing requirement to waste water.Entire processing method is stable, reliable and be easy to real
It is existing, easy to operate, it is with a wide range of applications in terms of high COD, with high salt, high-toxic pesticide wastewater treatment.
During strengthening Fenton's reaction, also further rear while substance of the iron powder of addition in recall reducing waste water
Continuous Fenton's reaction serves as catalyst, and synergistic oxidation organic matter accelerates reaction rate, reduces reaction volume, and reduce Fenton's reaction
Added amount of chemical, improve remove organic matter efficiency when also save Fenton reagent, saved operating cost.
In electrolytic catalysis reaction, active carbon is added, is utilized respectively stainless steel and graphite as cathode and anode material, shape
At three-diemsnional electrode electro-catalysis reducing process, not only increase the effective area of electrolysis, but also it is organic directly to degrade by electrode reaction
Object, or generating hydroxyl radical free radical, ozone etc. by electrode reaction has the intermediary of strong oxidizing property come degradation of organic substances, mentions significantly
High electrolytic efficiency.
Temperature is maintained 100 ~ 110 DEG C in evaporation process, using MVR evaporator, efficiently utilizes secondary steam energy, mentions
High evaporation efficiency reduces the energy consumption in evaporation process.
Evaporator couples centrifugal device, carries out recycling treatment to the salt in agricultural chemicals waste water, recycles sodium chloride, nitrous acid
Sodium product and sodium sulphate product.
During strengthening Fenton's reaction, using evaporation Liquid Residue burning gained heat, the temperature of Fenton's reaction is maintained, is returned
The heat that high temperature burning handling Liquid Residue generates is received, cost has been saved.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the description in above embodiment and specification only illustrates the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variation and
Improvement is both fallen in the scope of protection of present invention.The claimed scope of the invention is by appended claims and its equivalent
Object defines.
Claims (5)
1. a kind of processing method of cymoxanil agricultural chemicals waste water, according to sequencing the following steps are included:
1) cymoxanil waste water, is delivered to waste water reactor, and alkali tune processing is carried out to waste water using solid sodium hydroxide, makes it
PH is 9 ~ 11;
2), after alkali tune, powdered active carbon, the additional amount of the active carbon are added into waste water are as follows: 0.03-0.05g/mL is stirred
Mixing is mixed, stainless steel forms three-dimensional electric grade electrolytic catalysis reaction as anode material and be electrolysed to waste water as cathode, graphite
Catalysis reaction, reaction time are 3 ~ 4h;
3) it, after cell reaction, stands and filters, the acidity of sulfuric acid regulation solution is used after filtering, makes its pH 3 ~ 5, be added
Iron powder carries outStrengthen Fenton's reactionAfter 2 ~ 3h, ferrous sulfate heptahydrate and 30%(V/V are sequentially added) hydrogen peroxide, maintain the temperature of reaction
Degree is 50 ~ 60 DEG C, and the reaction time is 3 ~ 4h;
4) after the completion of, strengthening Fenton's reaction, after iron powder first is recovered by filtration, the alkalinity of sodium hydrate regulator solution is recycled, it is made
PH is 8 ~ 10, filters after standing, takes supernatant to enter pre-heating system, be increased to 50-60 DEG C to temperature, waste water is conveyed into evaporation
Device is evaporated;
5), the fraction of the generation in evaporation process is diluted using the water outlet of A/O biochemical system,A point concentration is slipped after dilution It is 1200-1500 mg/L,Biochemical treatment is carried out into A/O biochemical treatment system,Waste water after A/O biochemical treatmentIt is directly entered
Garden pipe network system;
6) Liquid Residue after, evaporating first directly is centrifuged, and is dried to obtain sodium chloride product, the further crystallisation by cooling of Liquid Residue to be evaporated
It is centrifuged again after to 38 ~ 43 DEG C, obtains sodium nitrite product, crystallisation by cooling obtains sodium sulphate production to centrifugation after 18 ~ 23 DEG C again
Product;
7) it, will be centrifuged remaining Liquid Residue twice and enter the burning of high-temp combustion device, the waste heat after high temperature will be recycled,
ForIt maintains to strengthen Fenton's reactionTemperature and pre-heating system.
2. the processing method of cymoxanil agricultural chemicals waste water according to claim 1, it is characterised in that: evaporator is MVR evaporation
Device.
3. the processing method of cymoxanil agricultural chemicals waste water according to claim 1 or 2, it is characterised in that: in the step 4)
Evaporating temperature in evaporation process is 100 ~ 110 DEG C.
4. the processing method of cymoxanil agricultural chemicals waste water according to claim 1, it is characterised in that: three-dimensional in the step 2
The electro-catalysis electric current of electric grade electrolytic catalysis reaction is 1 ~ 2A, and electro-catalysis voltage is 3.5 ~ 5.0V.
5. the processing method of cymoxanil agricultural chemicals waste water according to claim 1, it is characterised in that: every liter in the step 3)
The additional proportion of liquid iron powder is 7 ~ 10g, and the concentration of hydrogen peroxide is 1% ~ 3%, and the concentration ratio of ferrous sulfate heptahydrate and hydrogen peroxide is
1:3 ~ 5.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470713A (en) * | 2020-04-13 | 2020-07-31 | 江苏南大华兴环保科技股份公司 | Method for treating cyanide-containing wastewater |
| CN111646625A (en) * | 2020-06-19 | 2020-09-11 | 见嘉环境科技（苏州）有限公司 | Water treatment device adopting multistage electrocatalysis evaporation and application method |
| CN114873689A (en) * | 2022-04-24 | 2022-08-09 | 河北海力香料股份有限公司 | Treatment method of waste brine generated in preparation of sodium p-nitrophenolate |
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