CN102849878B - Pretreatment method for industrial wastewater of pyrethroid - Google Patents
Pretreatment method for industrial wastewater of pyrethroid Download PDFInfo
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- CN102849878B CN102849878B CN201210379802.9A CN201210379802A CN102849878B CN 102849878 B CN102849878 B CN 102849878B CN 201210379802 A CN201210379802 A CN 201210379802A CN 102849878 B CN102849878 B CN 102849878B
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Abstract
The invention discloses a pretreatment method for industrial wastewater of pyrethroid. The pretreatment method is characterized by comprising the following steps of: (1) carrying out first-grade treatment by a ferric-carbon microelectrolysis technology to remove a part of pollutant in industrial wastewater; (2) carrying out second-grade oxydative degradation treatment on the micro-electrolyzed industrial wastewater by a diamond electro-catalysis technology; and (3) carrying out third-grade treatment on the wastewater which is electrically catalyzed by diamond by the ferric-carbon microelectrolysis technology. The method is very good in treatment effect of various pesticide wastewaters, and can meet the water inflowing requirement of the existing biochemical wastewater treatment (COD (chemical oxygen demand) is less than 1000mg/L).
Description
Technical field
The invention belongs to trade effluent preconditioning technique field, be specifically related to a kind of pretreatment process of pyrethroid factory effluent, make its water outlet can meet the influent quality requirement in routine biochemistry pond.
Background technology
Agricultural chemicals, as the Important Agricultural production means that guarantee higher yield of crops good harvest, is the emphasis of development of chemical industry always.There is family more than 1000 of pesticide producing enterprise in China at present, its Central Plains medicine family more than 400, and nearly 700,000 tons of the throughput of former medicine, nearly 300,000 tons of annual production, occupies second place of the world.But at present the integral level of China's pesticide industry is compared and still had larger gap with World Developed Countries, be mainly manifested in unreasonable products structure, wide in variety, high added value and ultra-high efficiency kind is few, toxicity is large, environment friendly is poor always.China's environmental aspect communique was pointed out in recent years: because the unreasonable use of agricultural chemicals, the negative impacts such as farmland quality reduction, area minimizing have been caused, therefore for guaranteeing that agriculture Sustainable development and ecotope exempts from destruction, the development of China's pesticide industry is to the field development of environment friendly agricultural, and a collection of new and effective agricultural chemicals is developed thus and uses.Wherein, pyrethroid (pyrethroids) is the world today's a kind of bionic Pesticide newly developed, for the pest control of the crops such as cotton, soybean, cereal, also for the control of sanitary insect pest.Be characterized in that, to person poultry safety, to pest efficient, its insecticidal activity is considerably beyond sterilants such as organochlorine, organophosphorus and amino formates, and dosage is only 1/tens of conventional pesticide.
But, pesticide wastewater always large with toxicity, concentration is high, complicated, improvement difficult and become the emphasis of social concerns.Its wastewater source is mainly from process of producing product, and the more than one hundred million tons of annual comprehensive discharge amount, especially cause severe contamination along river valley to surrounding environment, and its management task is very arduous.The pyrethroid factory effluent relating in this patent just contains the organism such as a large amount of toluene, sulfur oxychloride and chloroform, and itself and natural degradation product thereof have " three-induced effect ", biological respinse is had to strong inhibition and toxic action.Country encourages waste water to carry out high density processing at present, but by conventional processes method, as wet air oxidation, process and can have that investment is large, weak effect, the cycle of operation are long, high in cost of production problem, so development of new efficiently, the pesticides waste water treatment process that tallies with the national condition has very great meaning.
The intractability of agricultural chemicals waste water is mainly reflected in the high (chemical oxygen demand cod of starting point concentration
crcan arrive hundreds of thousands of milligrams per liter up to several ten thousand), the water inlet that makes water outlet meet biochemistry pool with current state of the art requires (COD
cr< 1000mg/L) also comparatively difficult.China is few for the report of pyrethroid production wastewater treatment in recent years, deep not enough to the research of this problem.
In fact, in the treating processes of pesticide wastewater, adopt any single treatment process to be all difficult to receive good treatment effect, general Research Thinking is all to launch around physico-chemical processes and two kinds of techniques of biological process at present, and majority is also using rationally effective combination of two kinds of techniques as the direction of research and probe.In fact, biochemical processing process is as current unique waste water treatment process of realizing large-scale application, due to its economical and efficient, and thering is special advantage aspect the pollutents such as removal ammonia nitrogen, so the workshop section that is generally absolutely necessary when sewage disposal flow scheme design.Although directly the pyrethroid wastewater biodegradability of discharge is poor, just can meet the water inlet requirement of biochemistry pool after certain pre-treatment, last qualified discharge.So what current producer paid close attention to is effective preprocessing means, as various physics and chemistry methods etc.Therefore studying new and effective preconditioning technique has become the task of top priority.At present, existing treatment technology all has certain limitation, can say and still lack so far the very reliable processing scheme of efficient and cost-effective.
Make a general survey of all kinds of water treatment method, electrochemical catalysis method due to its distinct advantages extremely countries in the world water treatment worker's parent look at, reason is that electrochemical process used the electronics of Environmental Safety as reagent, is expected to avoid producing secondary pollution; Equipment is comparatively simple, is easy to automatic control, and hardly degraded organic substance is had to good treatment effect, also can make the organism of difficult degradation be converted into can biochemical degradation organism, or make the organism of the non-biochemical degradation mineralising of directly burning generate CO
2and H
2o.Specifically, electrochemical catalysis method can be divided into catalytic oxidation and electrical catalyze reduction two class techniques.
Wherein, the micro-electrolysis process of iron charcoal is the representative of electrical catalyze reduction technique, it is according to corrosion of metal electrochemical principle, and the good process that the microbattery effect that utilization forms is administered waste water, claims again internal electrolysis, iron charcoal method, Filtration with Iron Filings, Zero-valence Iron Process etc.From the sixties in 20th century, begin one's study, in the seventies, be applied in the improvement of waste water afterwards.Due to the distinct advantages of this method, therefore from being born, the states such as the Jiu U.S., USSR (Union of Soviet Socialist Republics), Japan cause extensive attention, existing a lot of patents, and obtained some practicality achievements.China is since the research in this field eighties in 20th century, and particularly development is very fast in recent years, all has more research report, the actual motion of input having in the improvement of the wastewater from chemical industry such as printing and dyeing, petrochemical industry, pharmacy.At present, micro-electrolysis process is widely studied and uses.It has the effect of the treatment of wastes with processes of wastes against one another, and cost for wastewater treatment is only 0.1 yuan/ton of left and right.Bio-refractory waste water, available micro-electrolysis is preprocessing means, thereby realizes the chain rupture of macromole organic pollutant, the destruction of color development and auxochrome group and decolouring, thus improve wastewater biodegradability, reduce subsequent disposal load and cost.
In electrocatalysis oxidation reaction, electrode is as eelctro-catalyst, and different electrode materialss can make the variation on the electrochemical reaction rates generation order of magnitude, therefore select suitable electrode materials, is the effective way that improves electrochemical catalysis reaction efficiency.Boron-doped diamond film (BDD, boron-doped diamond) electrode is as a kind of electrode materials of novelty, compare with conventional graphite electrode, noble metal electrode and metal electrode etc., there is best anodic oxidation ability, the strongest erosion resistance and contamination resistance, the widest potential window and the highest current density, and the most reliable biology safety.Seldom, and the coupling of relevant diamond electrocatalysis and the micro-electrolysis of iron charcoal research is with regard to still less in the research that both at home and abroad such electrode materials is applied to sewage disposal, and the present invention comes therefrom.
Summary of the invention
The object of the invention is to provide a kind of pretreatment process of pyrethroid factory effluent, has solved in prior art the problems such as poor, the existing physico-chemical process pretreating effect of pyrethroid wastewater biodegradability is not good.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A pretreatment process for pyrethroid factory effluent, is characterized in that said method comprising the steps of:
(1) adopt the micro-electrolysis process of iron charcoal to carry out first step processing, remove a part of pollutent in factory effluent;
(2) factory effluent after microelectrolysis processing carries out second stage oxidative degradation processing by diamond electrocatalysis technique;
(3) waste water after diamond electrocatalysis is processed carries out third stage processing by the micro-electrolysis process of iron charcoal again, reaches biochemistry pool water inlet requirement.
Preferably, in the micro-electrolysis process of described iron charcoal, filler is selected the mixture of iron filings and columnar activated carbon; Its volume ratio is controlled in the scope of 1: 1.
Preferably, the anode electrolytic cell in described diamond electrocatalysis technique is selected boron-doped diamond electrode.
Preferably, treatment time when described diamond electrocatalysis technique is carried out oxidative degradation is 1 hour, applies current control at 1.0A.
Principle of work of the present invention is described below:
(1) the micro-electrolysis process of iron charcoal.Micro-electrolysis process is based on metallic substance (iron, aluminium etc.) corrosion electrochemistry principle, by two kinds of metals with Different electrodes current potential or metal together with nonmetal being in direct contact with, be immersed in conductive electrolyte solution, there is battery effect and form countless small corrosion galvanic cells and (comprise macroscopical battery and microcosmic battery, microcosmic battery is causing higher than pure iron with the iron carbide of nano sized particles distributions and the chemical potential of some impurity due to iron filings itself, macroscopical battery is in iron filings, to add macroscopical cathode material as graphite, coke, gac, coal cinders etc. directly contact iron Carbon Materials and form, be equivalent to be subject on the basis of micro-cell corrosion at iron filings, corrosion or micro-electrolytic action have further been strengthened), metal anode is corroded and consumes, simultaneous electrochemical corrosion has caused again a series of related synergies, therefore iron charcoal micro-electrolysis method is flocculation, absorption, build bridge, volume is swept, coprecipitated, galvanic deposit, the result of the multiple effect combined effect such as electrochemical reduction.
(2) diamond electrocatalytic oxidation metallization processes.Its principle is at electrode surface, to produce a large amount of living radicals and oxide species (as hydroxyl radical free radical, ozone and hydrogen peroxide etc.) under the electric field action of some strength, for all kinds of organic pollutants in waste water, has degradation effect fast.A response feature of this technique is: within the specific limits, execute alive very little increase and can cause the variation on the speed of reaction order of magnitude, this size that makes can to carry out regulating voltage in water technology is carried out the control of wastewater treatment.According to the practical situation of waste water, can adopt and adjust current density, add methods such as appropriate suitable supporting electrolyte etc. to carry out fortified water treatment effect.In addition, if contain ferrous ion and iron ion in waste water, thereby can be combined with the hydrogen peroxide that diamond surface produces and cause Fenton reaction, further improved the output of hydroxy radical qiao isoreactivity species in reactor, also just corresponding treatment effect better has faster reduced processing energy consumption and processing cost simultaneously.
The inventor comprehensively analyzes the composition of pyrethroid factory effluent, due to organic content and salts contg all higher, it is most suitable using electrochemical method.First adopting the micro-electrolysis process of iron charcoal is based on following some consideration: in (1) waste water, contain a certain amount of suspended substance and oil content, if directly enter electrolyzer, will there is cohesion and sedimentation in part suspended substance, can be to unfavorable phenomenons such as electrochemical system result in blockage under electric field action; (2) organic content of water inlet is very high, directly adopt the energy consumption that electrocatalytic oxidation method is corresponding very high, so first adopt in the present invention the micro-electrolysis process of iron charcoal to carry out first step pre-treatment, remove after the pollutant component that most suspended substances and a part be difficult to oxidation electrolytic oxidation again, just can reduce follow-up energy consumption and avoid occurring blockage problem; (3) in the waste water after processing, also contain a certain amount of ferrous ion and iron ion, for diamond electrocatalysis technique, can play the effect of Synergistic degradation, also reduced processing cost simultaneously.
The main degraded of micro-electrolysis is difficult to oxidation but the organic pollutant of easy reduction to liking some, and some easy compounds that are oxidized but are difficult for reducing are mainly processed in diamond electrocatalysis, so both appropriate combinations can realize mutual supplement with each other's advantages to a certain degree.The oxidative degradation that waste water after microelectrolysis processing adopts diamond electrocatalysis technique to carry out is to a certain degree processed, stronger, the chemically inert pollutent of some toxicity (micro-electrolysis cannot or be difficult to process) is carried out to effective detoxification or degraded, at this moment effluent quality is difficult to reach the water inlet requirement of biochemistry pool toward contact, can re-use second stage microelectrolysis processing, make to process the water inlet requirement that rear water quality meets biochemistry pool.
Specifically, the present invention proposes a kind of high-efficiency pretreatment technique for pyrethroid factory effluent, comprise that the micro-electrolysis one-level of iron charcoal electrical catalyze reduction, boron-doped diamond secondary catalytic oxidation and three grades of electrical catalyze reductions of the micro-electrolysis of iron charcoal, three parts form.For initial COD
crpyrethroid factory effluent for 18000-20000mg/L, adopt aforesaid combination technique, wherein the electrical catalyze reduction treatment time of the first step of the micro-electrolysis of iron charcoal and the third stage is respectively 4 hours and 1 hour, treatment time of boron-doped diamond second stage catalytic oxidation and when applying electric current and being respectively 1h and 1.0A, the COD of water outlet
crvalue is lower than 1000mg/L, and biological oxygen demand (BOD), lower than 580mg/L, illustrates that biodegradability is greatly improved, and the water inlet that has met follow-up biochemistry pool completely requires (COD < 1000mg/L).
With respect to scheme of the prior art, advantage of the present invention is:
In technical solution of the present invention by the composition of the water quality of required processing is analyzed, take into full account and compare the variation fluctuation range of its composition and each concentration of component, design corresponding adjusting measure, as diamond electrocatalysis workshop section, can carry out by regulating voltage or electric current the adjusting of realization response speed.
2, technical solution of the present invention can be guaranteed stable and effective water treatment effect, also can be used as a kind of efficient means and is applied among the processing of other similar chemical production wastewater.
In sum, the present invention introduces Industrial Wastewater Treatment field boron-doped diamond electrode, in the situation that the cost of manufacture of diamond electrode significantly declines, adopts it as functional materials, to process trade effluent and has progressively become feasible.The present invention is directed to the water quality situation of pyrethroid factory effluent, in conjunction with Tie Tanwei electrolysis workshop section and diamond catalytic oxidation workshop section advantage separately, carried out ingenious combination.This combination process has very strong suitability, for all kinds of agricultural chemicals waste waters, all has good treatment effect, and the water inlet that can meet existing biochemical sewage processing requires (COD
cr< 1000mg/L).
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the treatment effect of embodiment of the present invention diamond electrocatalysis technique to the pyrethroid factory effluent after microelectrolysis processing;
Fig. 2 is the performance comparison of embodiment of the present invention DSA electrode and BDD electrode in pyrethroid factory effluent Study on degradation, figure A is the COD value variation tendency of pyrethroid waste water after the processing of both correspondences in electrolytic process, schemes B and be the relation (reaction conditions: applying electric current is 0.50A of pyrethroid factory effluent COD clearance and corresponding energy consumption; Flow velocity is 400mL/min; Temperature T=45 ± 1 ℃).；
Fig. 3 is the treatment effect figure of the micro-electrolysis process of embodiment of the present invention secondary iron charcoal to pyrethroid factory effluent;
Embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for the present invention is described.The implementation condition adopting in embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
Embodiment 1 carries out the application of certain insecticide factory's water treatment by the pretreatment process of pyrethroid factory effluent.
The pyrethroid factory effluent that the production line of You Mou insecticide factory is discharged, the whole dark yellow of this composite waste, there is certain irritating smell, by analysis, this Pollutants in Wastewater mainly contains the mould amine of chlorine, triethylamine, toluene, normal hexane, methyl alcohol, benzene, sulfur oxychloride, chloroform, tetrahydrofuran (THF), tetracol phenixin, the trimethyl carbinol, CN
-, SO
4 2-, Cl
-deng, it has following characteristics: the whole aobvious dark yellow of waste water, has intense stimulus smell and a certain amount of suspended substance, the high (COD of Pollutant levels
crbetween 18000-20000mg/L), be difficult to biological degradation and natural degradation, go back and in waste water, contain a certain amount of oil content.Visible, this waste water composition is very complicated, contains many materials to the toxic property of biology, belongs to high salt, high COD, is difficult to biological degradation class waste water.The chemical oxygen demand cod of technological test waste water used
crwith biological oxygen demand (BOD) BOD
5between 18000-20000mg/L, 6750-6990mg/L, pH value is between 3～5 respectively.Water temperature: 20 ℃; After processing, expectation reaches biochemistry pool water inlet standard (leading indicator COD < 1000mg/L).
In research, mainly using COD removal amount as performance assessment criteria, and its NOVA60 multiparameter water quality analyzer Spectroquant and Thermoreaktor TR200 that detects the import of the German MERCK of use company analyzes.Useful range is 25-1500mg/L (corresponding 14541#COD testing tube), two kinds of 10-150mg/L (corresponding 14540#COD testing tube), therefore general direct, water sample to be measured is got to the COD testing tube that 3ml enters to add reagent, in the Thermoreaktor of 148 ℃ of constant temperature, heat 2h, taking-up is cooled to room temperature, insert determinator, the COD value of directly reading water sample.
According to the index of comprehensive analysis, consider that waste water influent density is higher and wherein have certain density suspended substance, if directly enter electrolyzer, under electric field action, will there is cohesion and sedimentation in part suspended substance, can be to unfavorable phenomenons such as electrochemical system result in blockage, the more important thing is into the organic content of water very high, directly adopt the energy consumption that electrocatalytic oxidation method is corresponding very high, in waste water after processing in addition, also contain a certain amount of ferrous ion and iron ion, for diamond electrocatalysis technique, can play the effect of Synergistic degradation.For this reason, determine first to adopt the micro-electrolysis process of iron charcoal to carry out first step pre-treatment to waste water.Concrete operations mode is: in micro-electrolysis reactor (cylindric), insert micro-electrolysis stuffing (mixture of the volume ratio iron filings of 1: 1 and gac), and standby after activation treatment (cleaning with tap water again after 30 minutes with 5% dilute hydrochloric acid immersion).Pyrethroid waste water is directly imported to micro-electrolysis reactor and carry out static immersing (waste water just in time floods filler, and the treatment capacity of every batch is 250mL), to emitting after certain hour to collect, enter next stage and process.Operation and the first step of third stage micro-electrolysis reactor are similar.
The diamond electrocatalysis workshop section using is plate and frame cell construction, the boron-doped diamond electrode that its Anodic adopts hot filament CVD to prepare, and electrode is the square piece of length of side 100mm, thickness is 2.0mm.And adopting wire cutting technology to make onesize stainless steel substrates, thickness is 1mm.Stainless steel substrates after polishing directly as negative electrode.Interelectrode distance is 10mm.At electrode two ends, apply the electric current of some strength, simultaneously waste water is with certain flow velocity electrolyzer of flowing through, in electrolyzer, obtain oxygenolysis, final outflow water can enter next stage workshop section, and the water inlet that reaches biochemistry pool that COD index can be stable after third stage microelectrolysis processing requires (COD < 1000mg/L).
(1) research of the micro-Electrolytic conditions of first step iron charcoal
Table 1 represents the treatment effect of the micro-electrolysis of iron charcoal to pyrethroid waste water.Can find out, extend in time, though COD clearance has the growth trend of increasing to slow down, after 4h, become mild.From technology angle, consider the factors such as facility investment, working cost and treatment effect, suggestion is decided to be 4h duration of contact, and the micro-electrolysis of 4h removed more manifold organism, is conducive to industrialization operation.The micro-electrolysis water outlet of 4h can guarantee that COD clearance, in 40% left and right, after this should proceed to other treatment process, and good preprocessing means has been served as by Ji Wei electrolysis workshop section.
Table 1 duration of contact of the impact on microelectrolysis processing effect
| Reaction times/ |
0 | 1 | 2 | 4 | 8 | 12 | 16 | 28 |
| Water outlet COD (mg/L) | 18500 | 14000 | 12250 | 11100 | 10100 | 9950 | 10000 | 9960 |
| COD clearance/% | 0 | 24.3 | 32.4 | 40.2 | 45.4 | 46.2 | 45.9 | 46.2 |
(2) research of second stage diamond electrocatalysis processing condition
In diamond electrocatalysis device, water treatment procedure is realized and circulated processing, its core is exactly the electrolyzer with diamond electrode, and its Anodic adopts Nb substrate BDD electrode, and its effective active area is 77.44cm
2(8.8cm * 8.8cm), negative electrode is the Nb substrate Pt membrane electrode of same size, interelectrode distance is 10mm.Use water-bath by liquid storage tank, reaction solution to be carried out cooling, make its homo(io)thermism 20 ℃ of left and right.Liquid storage tank is 500mL, and batch processing amount is 250mL.Pour the reaction solution preparing into liquid storage tank and drive with peristaltic pump, carry out recycle electrolytic oxidation processing and every time sampling, after reaction, water sample carries out COD detection.The anode that comparative study adopts is the titanium iridium ruthenium anode (being designated as DSA electrode) that chlorine industry that Baoji Bu Tai company provides is used, and size dimension is similar to BDD electrode.
Consider that actual waste water quantity discharged is very large, and pH value and water temperature change little, substantially can be considered as constant, so be not suitable for adding ionogen or oxygenant in waste water, or as the bronsted lowry acids and bases bronsted lowry that regulates pH value, so important processing parameter is exactly the reaction times and applies current density.
The impact that Fig. 1 represents the reaction times is described and applies current density.Can find out, very fast in initial reaction stage degraded, but after 1 hour, reaction tends towards stability.When applying electric current and be 0.5A, 1.0A and 2.0A, react after 1 hour, COD clearance reaches respectively 44.6%, 73.9% and 84.7%, removes need further to extend the reaction times completely.This result shows: by BDD technique, as the preprocessing means pyrethroid factory effluent of degrading, be highly effective.Consider that the micro-electrolysis water outlet of this experimental installation exists ferrous ion (its concentration is roughly between 200-250mg/L) to a certain degree, so also may there is Fenton oxidizing reaction simultaneously.When the increase of current density improves treatment effect, current efficiency also declines to some extent, and to the reaction later stage, along with the steady decline of Pollutant levels, electrolytic efficiency also declines very soon, processes energy consumption and doubles to increase, so be necessary to seek a trim point.For this reason, the optimal processing parameter for pyrethroid wastewater treatment that we select is combined as: treatment time and apply electric current and be respectively 1h and 1.0A, corresponding COD clearance is 74% left and right, and water outlet COD value stabilization is between 2800-3000mg/L.If influent concentration fluctuates to some extent (rise or decline), can suitably regulate and apply electric current with stabilizing treatment effect (utilizing controllability and adaptability that this technique is very strong).
For the superiority of diamond electrode (BDD) is described, use in an embodiment titanium iridium ruthenium anode (DSA) conventional in chlorine industry to carry out comparative study.As shown in Figure 2, the advantage of BDD technique is fairly obvious.Applying electric current, be 1A and reaction after 1 hour, with the COD clearance of BDD electrode and DSA electrode processing pyrethroid factory effluent, be respectively 73.8% and 13.6%.The situation that the COD clearance of take is again 12% is example, and the energy consumption that BDD electrode and DSA electrode pair are answered is respectively 21.9KWh/m
3and 123.8KWh/m
3, the latter is about the former 6 times.This explanation BDD technique has very strong Pollutant Treatment ability really, goes back corresponding very low process energy consumption simultaneously.
(3) research of the micro-Electrolytic conditions of third stage iron charcoal
Waste water after process the second stage still can not meet the water inlet requirement of biochemistry pool, so consider to pass through one-level microelectrolysis processing again.It should be noted that the concentration of waste water now and composition and the former water of agricultural chemicals waste water are than there being very large variation.Diamond electrocatalysis workshop section can be decomposed into complicated organic pollutant some easy-to-handle micromolecular compounds, so micro-electrolysis process can continue to bring into play its advantage.
The class of operation of concrete operation steps and the micro-electrolysis of first step iron charcoal seemingly.
Fig. 3 represents the variation relation of the COD value of second stage water outlet with the micro-electrolysis reaction time.Can find out, as long as the reaction times reaches 1 hour, water outlet COD just can be reduced to below 1000mg/L, has reached the water inlet requirement of biochemistry pool.
Above-mentioned example is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations that spirit is done according to the present invention or modification, within all should being encompassed in protection scope of the present invention.
Claims (4)
1. a pretreatment process for pyrethroid factory effluent, is characterized in that said method comprising the steps of:
(1) adopt the micro-electrolysis process of iron charcoal to carry out first step processing, remove a part of pollutent in factory effluent;
(2) factory effluent after microelectrolysis processing carries out second stage oxidative degradation processing by diamond electrocatalysis technique;
(3) waste water after diamond electrocatalysis is processed carries out third stage processing by the micro-electrolysis process of iron charcoal again, reaches biochemistry pool water inlet requirement.
2. according to the method for claim 1, it is characterized in that adopting the mixture of iron filings and columnar activated carbon as filler in the micro-electrolysis process of described first step iron charcoal, the former water of waste water directly enters reactor and carries out sequence batch (processing, and the reaction times is 4 hours.
3. according to the method for claim 1, the anode electrolytic cell that it is characterized in that described second stage diamond electrocatalysis technique is selected boron-doped diamond electrode, treatment time when described diamond electrocatalysis device carries out oxidative degradation is 1 hour, applies current control at 1.0A.
4. according to the method for claim 1, it is characterized in that adopting the mixture of iron filings and columnar activated carbon as filler in the micro-electrolysis process of described third stage iron charcoal, waste water enters reactor and carries out sequence batch (processing, and the reaction times is 1 hour, and reaction water outlet can directly enter biochemistry pool.
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| CN103693783A (en) * | 2013-12-27 | 2014-04-02 | 重庆大学 | Method for removing pyrethroid pesticide in water |
| CN104803507B (en) * | 2015-04-09 | 2016-08-17 | 山东华阳农药化工集团有限公司 | A kind of effective cypermethrin comprehensive treatment method for wastewater |
| CN105366846B (en) * | 2015-09-11 | 2018-08-21 | 广东绿巨人环境科技有限公司 | The clever agricultural chemicals waste water processing method of hundred grass of one kind |
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| CN106669678B (en) * | 2017-01-12 | 2019-12-24 | 沈阳大学 | Preparation method of catalyst for electrocatalytic degradation of organic wastewater |
| CN109502840A (en) * | 2018-11-19 | 2019-03-22 | 江苏全给净化科技有限公司 | A kind of pretreatment unit of industrial wastewater |
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| 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 |
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| CN201942598U (en) * | 2011-01-28 | 2011-08-24 | 江苏省环境科学研究院 | High-concentration pyridine waste water treatment equipment |
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