CN1296296C - Textile printing and dyeing waste water processing system and method - Google Patents
Textile printing and dyeing waste water processing system and method Download PDFInfo
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- CN1296296C CN1296296C CNB200410041616XA CN200410041616A CN1296296C CN 1296296 C CN1296296 C CN 1296296C CN B200410041616X A CNB200410041616X A CN B200410041616XA CN 200410041616 A CN200410041616 A CN 200410041616A CN 1296296 C CN1296296 C CN 1296296C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to a processing system and a processing method for industrial waste water. The system of the present invention is provided with a sodium chloride electrolytic cell, a chlorine gas absorption tank, a sodium hydroxide solution storage tank, an oxidation pond, a press filter, a pH value regulation pond, an aerobic biochemistry pond, a sedimentation pond, a blower, an output pump of the oxidation pond, an input pump of the aerobic biochemistry pond, and a sludge pump. The method of the present invention comprises the following steps: sodium chloride water solution is electrolyzed in an electrolyzer, and chlorine gas and sodium hydroxide water solution are obtained; after the chlorine gas is absorbed by water in the chlorine gas absorption tank, mixed water solution of hydrogen chloride and hypochlorous acid is generated; dyeing waste water is processed by the mixed water solution in the oxidation pond, the dyeing waste water is filtered in the press filter, the pH value of the dyeing waste water is regulated in the pH value regulation pond, the dyeing waste water is aerated and biochemically processed in the aerobic biochemistry pond, and finally, the dyeing waste water is precipitated in the sedimentation pond; clear solution in the upper layer comes up to the standard and can be discharged; after sludge in the lower layer is filtered and concentrated, the sludge is further processed. The present invention has the advantages of low cost, higher efficiency and convenient operation. The present invention can fully and effectively process dyeing waste water.
Description
Technical field
The present invention relates to a kind of industrial wastewater treatment system and processing method of industrial waste water.
Background technology
Textile printing and dyeing wastewater is comparatively serious to the pollution of environment, and not only the waste discharge amount is big, and the total amount of pollutant is also maximum.Because the dyeing waste water complicated component, be China than one of trade effluent of refractory reason.The general treatment process of dyeing waste water generally has two kinds, and a kind of is bioremediation, and another kind is a chemical treatment method.Though usually chemical treatment method have rapidly, advantage completely, need add corresponding chemical processing agent to different dyeing waste waters, so running cost is higher; Though bioremediation running cost is lower, but because bacterial classification has certain requirement to living environment, and its processing power has certain restriction, so can not accomplish processing in full force and effect to dyeing waste water.
Chemical treatment method has foamet, filtration method, neutralisation, coagulant sedimentation, air supporting method, electrolytic process, active carbon adsorption and oxidative decoloration method etc.Contain a large amount of washing composition in the dyeing waste water, biological treatment is invalid to washing composition usually, and the existence of washing composition all seriously influences to the transfer of oxygen, to microorganism absorption organism, the existence of washing composition has dissemination to coagulating agent, thereby can increase the consumption of coagulating agent, for this reason, before the treatment of dyeing wastewater, preferably remove the washing composition in the waste water in advance.Foamet is provided with at washing composition contained in the waste water specially, and needing increases special equipment, but can also adopt removals such as active carbon adsorption, oxygenolysis method and ion exchange method for the foam in the dyeing waste water.Filtration method is to make waste water by having the granular filtering layer of hole, as quartz sand etc., with the residual suspended substance in the trap water, as colloid, throw out, algae and bacterium etc., filtration method mainly is used as the pre-treatment measure of charcoal absorption, ion-exchange and chemical oxidation treatment.Neutralisation generally only plays the pH value of regulating waste water, can not remove other pollution substances in the waste water, for the waste water that contains thioxine dyes, also can discharge hydrogen sulfide, so neutralisation often is used with other facture.Contain a large amount of dyestuffs, auxiliary agent, slurry, washing composition and other chemical agent in the dyeing waste water, wherein the dyestuff majority is colloidal state, coagulant sedimentation is exactly with after the coagulating agent dissolving, adding mixed reaction pond mixes with waste water and organic cohesion of multiple polymer substance, colloid and flocculation in the waste water, the waste water after will handling is again transported to and further in the settling tank condense and flocculate and these materials are removed from waste water; The coagulating agent that coagulant sedimentation is used always has Tai-Ace S 150, alum, iron trichloride, ferrous sulfate, lime and the mineral acid that belongs to inorganic salts, belongs to the aluminium chlorohydroxide and the polyacrylamide of macromolecular compound in addition.It has been generally acknowledged that, in dyeing waste water, contain organic colloidal particle, be the cilium etc. of various lipid impurity, fiber fines and the hydrophobic synthetic fibre of milkiness shape.The particle of the flocs unit that is produced behind these impurity process coagulations is little, in light weight, precipitation threshold is relatively poor; The air supporting method feeds air exactly in the waste water and generate a large amount of micro-bubbles in water, is carrier with it, above-mentioned contaminant particles is sticked on the bubble, by pneumatically supported rising buoyancy.Drive them and float to the surface on together and in time remove, make itself and water sepn.Electrolytic process is to utilize the chemical reaction of electrolytic process that the detrimental impurity in the waste water is transformed and removed method, the aqueous solution produces the hydroxide radical discharge and generates the very strong nascent oxygen of oxidation capacity at inert anode in electrolysis, can carry out oxidation to the inorganic and organic compound in the water; When salt or when adding salt then in the water, then generate hypochlorite, make the impurity in the water oxidized; Negative electrode at electrolyzer then produces hydrogen ion discharge formation hydrogen atom and then forms hydrogen molecule, and the hydrogen of this status nascendi has very strong reductive action to some organism, for example, to being in some pigment of oxidation state, can be reduced into colorless substance; In electrolytic process, some material can directly produce oxidation or reduction reaction on electrode, as cyanogen is oxidized to nontoxic nitrogen and carbonic acid gas etc. at anode surface; In electrolytic process, anode and negative electrode constantly produce oxygen and hydrogen, and overflow with micro-bubble, and the lipid impurity that makes the organic colloid particulate in the waste water and be the milkiness shape adheres to each other with it to float and removes to the water surface, and this process is called electric floating effect.Absorption is meant that in two-phase system the automatically phenomenon of variation takes place material concentration, automatically transfers to solid phase surface as atom in liquid phase or the gas phase or molecule on phase interface, the phenomenon that the material concentration of solid phase surface is increased.Active carbon adsorption is meant and utilizes nonpolar gac to be sorbent material, removes to adsorb the nonpolar organic pollutant in the waste water, to reach the method for removing this pollution substance.In general, be present in organism in the mixed solution, and water temperature is low, the pH value is low helps charcoal absorption than easier being adsorbed that separately exists in the solution.Must regenerate after charcoal absorption reaches capacity, so-called regeneration is meant not changing under the condition of this body structure of gac substantially, and the material that is adsorbed in the charcoal hole is removed, and makes it recover adsorptive power; Concrete grammar has solvent method, wet oxidation process, chemical oxidization method, biological process and heating method etc.; Heat method of reproduction wherein will be discharged large quantity of exhaust gas for being used for the most general and effective means of water treatment granulated carbon regeneration at present in the whole process of this method, must just can enter atmosphere after the purifying treatment.Dyeing and printing sewage has dyestuff so have darker color mostly because of residual, dyeing waste water is after biological process or Coagulation with Treatment, its colourity has certain reduction, the percent of decolourization of biological process is 40% to 50% generally speaking, the percent of decolourization of Coagulation Method is between 50% to 90%, therefore, the processing of must further decolouring; Decoloration treatment method commonly used has oxidation style and absorption method, and the oxidative decoloration method is divided into three kinds of oxychlorination method, ozone oxidation method and photooxidation methods again.The oxychlorination agent commonly used of oxychlorination method has liquid chlorine, chlorinated lime and clorox etc., and the oxychlorination agent all has good decolorizing effect for the water-soluble dye of easy oxidation and the water-insoluble dyestuff of easily oxidation.Relatively poor for the dye decolored effect of the water-insoluble that is difficult for oxidation; When containing more suspended substance and slurry in the waste water, consume a large amount of oxygenants and can not remove these materials; In oxidising process, the major part of dyestuff is present in the water outlet with oxidation state, and through placing, the dyestuff that has also may recover primary colors; So this method is difficult for using separately, cost is higher simultaneously.The preparation method of the ozone that the ozonize decoloring method is used has high voltage noiseless discharge being adopted method, chemical method, electrolytic process and ultraviolet method etc., these methods are to make oxygen-containing gas under the effect of extraneous high energy, make oxygen molecule be excited to resolve into Sauerstoffatom, under certain condition, wherein the partial oxygen atom voluntarily in conjunction with or become ozone with combination with oxygen.It is generally acknowledged that the dyestuff colour developing is to be caused by its chromophoric group, these chromophoric groups all have unsaturated link(age).Ozone can make these contained in dyestuff radical oxidations decompose, and generates less organic acid and the aldehydes of molecular weight, makes it lose the color development ability; Because of the difference of the kind of dyestuff, the position difference of its chromophoric group is so the percent of decolourization that ozone decolours to them also has than big-difference; For the waste water that contains water-soluble dye, as active, directly, dyestuffs such as positively charged ion and acidity, its percent of decolourization is very high; For containing insoluble dispersed dye waste water decolorizing effect is preferably arranged also.But for the insoluble dyes such as reduction, thioxine dyes and the coating that are present in finely divided suspension in the waste water, decolorizing effect is relatively poor; At this moment, have document to propose: contained dyestuff is based on dispersed dye in waste water, and suspension content more for a long time, should adopt coagulation-ozone combined process flow.The photoxidation decoloring method is the strong oxygenizement that produces when utilizing light and oxidant combined effect, and the organic pollution materials in the oxygenolysis waste water makes BOD, the COD of waste water and a kind of treatment process that colourity descends significantly.Oxygenant commonly used in the photoxidation decoloring method is a chlorine, the effectively only ultraviolet ray of special wavelength.Ultraviolet ray plays katalysis to the decomposition of oxygenant and the oxidation of pollution substance.The photooxidation reaction process that with chlorine is oxygenant is: the water-soluble generation hypochlorous acid of chlorine; under the effect of light, decompose and produce the nascent oxygen that performance is very active and have strong oxidation capacity; under the promotion of light; nascent oxygen carries out oxygenolysis rapidly to the organism in the waste water; this effect is carried out repeatedly, finally might make carbonaceous organic material resolve into water and carbonic acid gas.
The biological treatment working cost is lower, only needs to consume certain electric power, and less input for other.The document introduction is arranged:, adopt bioremediation to have effect preferably because dyeing waste water belongs to organic wastewater; As long as resupply its air in certain amount, the organic pollutant in the dyeing waste water will through precipitate and separate, and can be removed pollutent by constantly absorption, oxidation, decomposition as the nutrition source of microorganism.Think in addition and adopt bioremediation can obtain stable removal effect that this is because after operation after a while, microorganism is constantly tamed, and dyeing waste water has been had certain adaptability; If adopt anaerobic hydrolysis-aerobic biological process for treating, this can make it to become the easily material of degraded in the macromolecular structure of difficult for biological degradation in the anaerobic hydrolysis stage destruction waste water; It then is to make an organic part by alienation that aerobe is handled, and another part assimilates.So-called alienation is exactly that the organism that is solid state and colloidal in the waste water is adsorbed by bacterium, under the effect of bacterium excretory exoenzyme, is hydrolyzed into dissolved matter, infiltrates in the bacterial cell again; Enter intracellular dissolved form organism under the endoenzyme effect, a part of oxidized simple inorganics that resolves into as carbonic acid gas, water, ammonia, nitrate radical, sulfate radical and phosphate radical, gives off energy simultaneously, is called dissimilation.Bacterium utilizes the energy of this part energy as vital movement, with the nutritive substance of another part organism as its growth and breeding, synthesizes new bacterial components, makes bacterial multiplication, is called assimilation.Organism has certain concentration in the aerobe processing requirements waste water, and enough oxygen is given in not cut-off.Though in theory, the biological treatment of dyeing waste water is a kind of method preferably,, microorganism has certain requirement for living environment, when running into reductive agent such as printing and dyeing enterprise sulfide commonly used, vat powder, can mass mortality and lose activity; Under the condition of market economy, the variety renovation of enterprise's production product is very fast, the change of production of various products is also bigger, thereby the organic deficiency in the waste water can cause bacterium autoxidation or endogenous respiration and bacterial number is reduced in a large number, organism in the waste water rolls up, then can have little time to handle and directly discharging, the replacing of kind and make bacterium have little time to adjust to adapt to or mass mortality or the like, therefore in fact real effect is not brought into play in the biological treatment of dyeing waste water.
The improvement technology that China's " techniques of Dyeing Wastewater Treatment policy " is recommended is based on biological treatment, is aided with the process for comprehensively treating of physical chemistry treatment technology again, and this technology is carried out a biological disposal upon to dyeing waste water earlier, carries out physical chemistry again and handles.When carrying out a biological disposal upon, the method that is adopted is " an anaerobic-aerobic biological treating method ", because the concentration of dyeing waste water is not very high, therefore, this method adopts the fs of anaerobic digestion process, i.e. anaerobic hydrolysis technology in the anaerobic treatment process, the macromolecular structure that this technology is carried out a biological disposal upon based on the difficulty of destroying in the waste water, and suitably improve the biodegradable property of wastewater energy; Through the organic concentration in the waste water after the biological treatment reduction has to a certain degree been arranged, thereby adopted physico-chemical process to continue to handle again and can satisfy the qualified discharge requirement.But, equally unavoidably tend to take place microorganism deactivated result because this improvement technology adopts first biology to handle the method that physical chemistry is handled again.
Aspect patent documentation, some records to the technical scheme of handling of dyeing waste water are arranged also.Chinese patent application 85102583 has proposed a kind of dyeing and printing sewage treatment process and technology, this invention with coal ash slag and lime mud as flocculation agent, but this method easily produces secondary pollution, decolorizing effect is bad; Chinese patent application 98104618 has proposed the method and the preparation thereof of a kind of dyeing sewage decoloration and purification, and it is the compound that adds potassium permanganate and have ferrous ion in coloured sewage, adds hydrogen peroxide again, and the cost of this method is higher; Chinese patent application 01130891 has proposed a kind of improvement method of wastewater in textile printing and dyeing industry, this method adds alkali to remove dispersed dye and matching stain in dyeing waste water, add acid to remove basic dyestuff and thioxine dyes etc., water-soluble reactive colour and the cationic dyestuff of oxidizer to remove easy oxidation, add reductive agent and remove organism such as azoic dyestuff, add flocculation agent to remove milkiness attitude, water-soluble attitude and dyestuff, at last waste water is removed organism such as alkyl chloride, hydro carbons by the adsorption of slag to be adsorbed by flocculation.Still there is the not thorough and cost problem of higher of treatment effect in this method.
Summary of the invention
The purpose of this invention is to provide that a kind of cost is lower, treatment effect textile printing and dyeing wastewater treatment system and textile printing and dyeing wastewater treatment process preferably.
Realize that the technical scheme that a kind of textile printing and dyeing wastewater treatment system is provided among the present invention is: native system has sodium chloride electrolysis groove, chlorine tourie, sodium hydroxide solution basin, oxidation pond, pressure filter, pH value equalizing tank, aerobic biochemical pond, settling tank, blower fan, oxidation pond Send out pump, aerobic biochemical pond front pump and sludge pump; The sodium chloride electrolysis groove has sodium chloride aqueous solution input interface, water input interface, chlorine output interface, aqueous sodium hydroxide solution output interface and hydrogen delivery port; The chlorine tourie has chlorine input interface, water input interface, hydrochloric acid and hypochlorous mixed solution output interface; The sodium hydroxide solution basin has an input interface and two output interfaces; Oxidation pond has waterwater entrance and wastewater outlet; Pressure filter has waterwater entrance, mud inlet and wastewater outlet; The aerobic biochemical pond has waterwater entrance and wastewater outlet; Settling tank has waterwater entrance and wastewater outlet; The chlorine output interface of sodium chloride electrolysis groove connects the chlorine input interface of chlorine tourie by pipeline; The aqueous sodium hydroxide solution output interface of sodium chloride electrolysis groove connects the input interface of sodium hydroxide solution basin by pipeline; The hydrochloric acid of chlorine tourie and hypochlorous mixed solution output interface are connected with pipeline, and the outlet of this pipeline is arranged on the waterwater entrance place of oxidation pond; The wastewater outlet of oxidation pond connects the waterwater entrance of pressure filter by pipeline and oxidation pond Send out pump; The wastewater outlet of pressure filter is connected with pipeline, and the outlet of this pipeline is arranged on the top of pH value equalizing tank; An output interface of sodium hydroxide solution basin is connected with pipeline, and the outlet of this pipeline is arranged on the top of pH value equalizing tank; The water inlet pipe of aerobic biochemical pond front pump is arranged in the pH value equalizing tank, and the outlet of the pipeline that aerobic biochemical pond front pump output interface is connected is arranged on the waterwater entrance place in aerobic biochemical pond; The wastewater outlet in aerobic biochemical pond communicates with the waterwater entrance of settling tank by connecting passage; Be provided with the sludge pipe of inlet at the bottom of near the pond in the settling tank, the outlet of sludge pipe links to each other with the inlet of sludge pump by coupled pipeline, and the mud pump outlet is connected with pipeline, and the outlet of this pipeline enters the mouth with the mud of pressure filter and links to each other; The air outlet of blower fan is connected with pipeline, and this pipeline has two pipeline air outlets, and one in two air outlets is arranged in pH value equalizing tank, and another is arranged in the aerobic biochemical pond.
Native system also can be provided with topping-up pump and hydrogen basin; The hydrogen delivery port of sodium chloride electrolysis groove links to each other with the inlet of topping-up pump, and the supercharging pump outlet links to each other with hydrogen basin inlet.
Above-mentioned sodium hydroxide solution basin also can be provided with second delivery port, and this delivery port can add groove with the sodium hydroxide solution of printing and dyeing workshop by pipeline and link to each other.
Native system also has stirrer, and oxidation pond can be divided into selective oxidation district, diffusible oxydation district and the mixing zone that links to each other successively, and the selective oxidation district is positioned at the waterwater entrance place of oxidation pond, and the bottom in selective oxidation district is positioned at the middle part of diffusible oxydation district and mixing zone; Be provided with isolating bar between the bottom in selective oxidation district and the diffusible oxydation district; Be provided with divider wall between diffusible oxydation district and the mixing zone, and be provided with the waste water through port at the middle part of divider wall; Stirrer is arranged on the waste water through port place of oxidation pond, and the overall dimension of the impeller of stirrer is slightly less than the width of waste water through port.The ingress, selective oxidation district of oxidation pond is provided with liquid distributor, and liquid distributor is positioned at the middle part or the bottom in selective oxidation district, is communicated with the chlorine tourie through pipeline and valve; The liquid distributor surface is provided with fluid hole.
The filter cloth surface of above-mentioned pressure filter scribbles one deck by water-soluble polyacrylamide layer; 50 order to 100 purpose filter screens are equipped with in the exit in aerobic biochemical pond.
Realize that the technical scheme that a kind of textile printing and dyeing wastewater treatment process is provided among the present invention is: present method has following steps: 1. the sodium chloride aqueous solution electrolysis in the sodium chloride electrolysis groove is generated chlorine and aqueous sodium hydroxide solution; The aqueous sodium hydroxide solution that generated flows into the sodium hydroxide solution basin, and the chlorine that is generated is admitted to the chlorine tourie, and the hydrogen that is generated pumps into the hydrogen basin or lights at hydrogen outlet from hydrogen outlet; The chlorine and the reaction of water wherein that are admitted in the chlorine tourie generate the hydrogenchloride and the hypochlorous aqueous solution; 2. the hydrogenchloride that generates in the chlorine tourie and the hypochlorous aqueous solution flow in the oxidation pond through pipeline and enter dyeing waste water, with part chromophoric group in the dyeing waste water and part auxochrome group generation oxidizing reaction and make decolorizing printing and dyeing waste water, and utilize hydrogen ion with positive charge make the micelle coagulation in the waste water become particle; 3. the waste water in the oxidation pond is squeezed into pressure filter with the oxidation pond Send out pump and filter, filtrate enters pH value equalizing tank; The mud that stays on the filter screen is waited for that then its arrival is a certain amount of and is scraped back dehydration outward transport; 4. under the state of the waste water air blast in pH value equalizing tank, the sodium hydroxide solution in the sodium hydroxide solution basin is added to the pH value of adjusting waste water in the pond in the pH value equalizing tank by pipeline reach 6 to 8; The waste water that 5. will regulate the pH value is squeezed into the aerobic biochemical pond with aerobic biochemistry pool front pump from pH value equalizing tank, under the state of waste water blast aeration in the pond, by the microorganism in the pond waste water is carried out biochemical treatment; 6. make it flow into settling tank to the waste water of handling through aeration, feed the hydrogenchloride and the hypochlorous aqueous solution that generate in the chlorine tourie simultaneously, waste water is carried out germicidal treatment; 7. the waste water in the settling tank is left standstill, until its precipitation fully, the supernatant liquid qualified discharge, lower floor's mud is squeezed into pressure filter with sludge pump and is filtered.
The oxidation pond of above-mentioned steps in 2. has selective oxidation district, diffusible oxydation district and the mixing zone that links to each other successively, and the selective oxidation district is positioned at the waterwater entrance place of oxidation pond, and the bottom in selective oxidation district is positioned at the middle part of diffusible oxydation district and mixing zone; Be provided with isolating bar between the bottom in selective oxidation district and the diffusible oxydation district; When the hydrogenchloride and the hypochlorous aqueous solution flow into oxidation pond, earlier in selective oxidation district and dyeing waste water generation oxygenizement, after dyeing waste water flows into the diffusible oxydation district, hypochlorous acid makes the further oxidation of dyeing waste water, mix through stirrer, after dyeing waste water entered the mixing zone, then because of hydrionic existence makes dyeing waste water generation coagulation, this moment, the pH value of dyeing waste water was 3 to 6.
The 3. middle used filter cloth surface of pressure filter of above-mentioned steps scribbles one deck by water-soluble polyacrylamide layer, not only can bring into play further coagulation, and the mesh that has partly stopped up filter cloth because of coagulum further improves filter effect to the electronegative micelle in the dyeing waste water; Step is provided with 50 order to 100 purpose filter screens in the exit in aerobic biochemical pond in 5., can effectively tackle mud and prevent that it from entering settling tank.
Above-mentioned steps adds the sanitary sewage of factory in 4. in pH value equalizing tank, can participate in the adjusting to pH value, increased step 5. in the nutriment of supply aerobic bacteria, and make this treatment process handling in the lump to sanitary sewage.
The present invention has positive effect: the key link that (1) the present invention handles dyeing waste water is: carry out oxidation, coagulation and filtration earlier, after carry out biochemical treatment, carry out germicidal treatment again, can effectively avoid microorganism to make the generation of the treatment capacity decline even the phenomena of mortality because of not shaking down, thereby can guarantee the normal operation of printing and dyeing wastewater treatment system, this treatment process has fundamentally solved and can not carry out comprehensively the effectively problem of processing to waste water, and the operation of total system is also more convenient.(2) to adopt lower-cost industrial sodium-chlor be raw material to oxygenant of the present invention, chlorine and sodium hydroxide are produced in electrolysis at the scene, directly water absorbs chlorine and makes hydrogenchloride and the hypochlorous aqueous solution and dyeing waste water is carried out oxide treatment in the chlorine tourie, and therefore not only having reduced running cost has also saved transportation cost; And the sodium hydroxide solution that makes removes in the pH value equalizing tank be used in system of the present invention and is used to regulate potential of hydrogen, and redundance can also be used for printing and dyeing workshop production, and can further reduce cost.(3) in the process of treatment of dyeing and printing, when running into the waste water output and seldom cause in the aerobic biochemical pond nutriment not enough, the present invention can select to add sanitary sewage to replenish the nutriment of aerobic bacteria in pH value equalizing tank, not only help the adjustment of pH value, and further reduced cost; When running into printing and dyeing workshop waste water output and increase more situation, can increase the hydrogenchloride that in oxidation pond, adds and the quantity of the hypochlorous aqueous solution, keep or improve degree of oxidation, thereby the aerobic bacteria that makes the road, back can normally move the biochemical treatment of waste water dyeing waste water; When running into the situation of changing dye species, can strengthen the hydrogenchloride that in oxidation pond, adds and the quantity of the hypochlorous aqueous solution in to the adaptive phase of new dyestuff at bacterial classification, create favorable conditions thereby shake down to aerobic bacteria.(4) adopt when having the selective oxidation district, diffusible oxydation district and the mixing zone that link to each other successively and the corresponding structure of liquid distributor being set when the oxidation pond of system of the present invention in ingress, selective oxidation district, dyeing waste water is chlorinated hydrogen and hypochlorous aqueous solution selective oxidation earlier in the selective oxidation district, after dyeing waste water flows into the diffusible oxydation district, hypochlorous acid makes the further oxidation of dyeing waste water, mix through stirrer, after dyeing waste water enters the mixing zone, then because of hydrogen ion with positive charge make the micelle coagulation in the waste water become particle; The high-efficient operation that helps treatment of dyeing wastewater.(5) the filter cloth surface of the pressure filter in the system of the present invention scribbles one deck by water-soluble polyacrylamide layer; Dyeing waste water can effectively be purified like this, has also reduced the sludge output in the aerobic biochemical pond; Filter screen is equipped with in the exit in aerobic biochemical pond, and the mud that can effectively tackle with a large amount of bacterial classifications flows into settling tank, improves the bacterial classification utilising efficiency.
Description of drawings
Fig. 1 is a kind of synoptic diagram of textile printing and dyeing wastewater treatment system of the present invention.
Fig. 2 is the major portion schematic layout pattern of the system of Fig. 1, has provided among the figure and has respectively installed relative high and low position relation.
Fig. 3 is the schematic top plan view of Fig. 2.
Fig. 4 is the structural representation of oxidation pond among Fig. 1, has provided the relative high and low position relation of oxidation pond each several part among the figure.
Fig. 5 is the schematic top plan view of Fig. 4.
Fig. 6 is a liquid distributor A-A schematic cross-section among Fig. 5.
Fig. 7 is a liquid distributor B-B schematic cross-section among Fig. 6.
Fig. 8 is the another kind of synoptic diagram of the electrolyzer of textile printing and dyeing wastewater treatment system of the present invention.
Embodiment
(embodiment 1)
See Fig. 1 to Fig. 3, the system of present embodiment has sodium chloride electrolysis groove 11, chlorine tourie 12, sodium hydroxide solution basin 13, oxidation pond 2, liquid distributor 24, stirrer 25, pressure filter 3, pH value equalizing tank 4, aerobic biochemical pond 5, settling tank 6, blower fan 7, oxidation pond Send out pump 81, aerobic biochemical pond front pump 82 and sludge pump 83.
Sodium chloride electrolysis groove 11 is an ion-exchange membrane electrolyzer, has sodium chloride aqueous solution input interface, water input interface, chlorine output interface, aqueous sodium hydroxide solution output interface and hydrogen delivery port; Chlorine tourie 12 has chlorine input interface, water input interface, hydrochloric acid and hypochlorous mixed solution output interface; Sodium hydroxide solution basin 13 has an input interface and two output interfaces; Oxidation pond 2 has waterwater entrance and wastewater outlet; Pressure filter 3 has waterwater entrance, mud inlet and wastewater outlet, and the filter cloth of pressure filter 3 adopts 500 order acid-fast alkali-proof filter clothes, and this filter cloth surface scribbles one deck by water-soluble polyacrylamide layer.Aerobic biochemical pond 5 has waterwater entrance and wastewater outlet; 50 purpose filter screens are equipped with in the exit in aerobic biochemical pond 5.Settling tank 6 has waterwater entrance and wastewater outlet.
The chlorine output interface of sodium chloride electrolysis groove 11 connects the chlorine input interface of chlorine tourie 12 by pipeline; The aqueous sodium hydroxide solution output interface of sodium chloride electrolysis groove 11 connects the input interface of sodium hydroxide solution basin 13 by pipeline; The hydrochloric acid of chlorine tourie 12 and hypochlorous mixed solution output interface are connected with pipeline, and the outlet of this pipeline is arranged on the waterwater entrance place of oxidation pond 2.The wastewater outlet of oxidation pond 2 connects the waterwater entrance of pressure filter 3 by pipeline and oxidation pond Send out pump 81.The wastewater outlet of pressure filter 3 is connected with pipeline, and the outlet of this pipeline is arranged on the top of pH value equalizing tank 4.An output interface of sodium hydroxide solution basin 13 is connected with pipeline, the outlet of this pipeline is arranged on the top of pH value equalizing tank 4, can add the interface that groove links to each other with the sodium hydroxide solution of printing and dyeing workshop by pipeline when second delivery port of sodium hydroxide solution basin 13 is to use.The water inlet pipe of aerobic biochemical pond front pump 82 is arranged in the pH value equalizing tank 4, and the outlet of the pipeline that aerobic biochemical pond front pump 82 output interfaces are connected is arranged on the waterwater entrance place in aerobic biochemical pond 5; The wastewater outlet in aerobic biochemical pond 5 communicates by the waterwater entrance of connecting passage with settling tank 6.Be provided with the sludge pipe of inlet at the bottom of near the pond in the settling tank 6, the outlet of sludge pipe links to each other with the inlet of sludge pump 83 by coupled pipeline, and the outlet of sludge pump 83 is connected with pipeline, and the outlet of this pipeline enters the mouth with the mud of pressure filter 3 and links to each other.The air outlet of blower fan 7 is connected with pipeline, and this pipeline has two pipeline air outlets, and one in two air outlets is arranged in pH value equalizing tank 4, and another is arranged in the pond in aerobic biochemical pond 5.
See Fig. 4 and Fig. 5, oxidation pond 2 has selective oxidation district 21, diffusible oxydation district 22 and the mixing zone 23 that links to each other successively, and selective oxidation district 21 is positioned at the waterwater entrance place of oxidation pond 2, and the bottom in selective oxidation district 21 is positioned at the middle part of diffusible oxydation district 22 and mixing zone 23; Be provided with isolating bar 21-1 between the bottom in selective oxidation district 21 and the diffusible oxydation district 22; Be provided with divider wall 22-1 between diffusible oxydation district 22 and the mixing zone 23, and be provided with the waste water through port at the middle part of divider wall 22-1; Stirrer 25 is arranged on the waste water through port place of oxidation pond 2, and the overall dimension of the impeller of stirrer 25 is slightly less than the opening of waste water through port.
See Fig. 6 and Fig. 7,21 ingress, selective oxidation district of oxidation pond 2 are provided with liquid distributor 24, and liquid distributor 24 is positioned at the middle part or the bottom in selective oxidation district 21, are communicated with chlorine tourie 12 through pipeline and valve; Liquid distributor 24 surfaces are provided with fluid hole.
The system of present embodiment is used for the treatment of dyeing wastewater of certain printing and dyeing workshop.This printing and dyeing workshop has two sizing-dyeing machines, uses thioxine dyes, about 100 tons of day waste discharge water yield.Waste water is apparent to be black, black and blue color, dark red or the like.Native system to treatment method of printing and dying wastewater is:
1. industrial sodium-chlor is dissolved in water, make every liter 310 to 320 the gram sodium chloride solution after input in the sodium chloride electrolysis groove 11.The electrolysis under 3.5 volts volts DS of sodium chloride aqueous solution in the sodium chloride electrolysis groove 11 is generated chlorine, hydrogen and aqueous sodium hydroxide solution; Make the aqueous sodium hydroxide solution that is generated flow into sodium hydroxide solution basin 13, the chlorine that is generated is squeezed into chlorine tourie 12 with pump, the hydrogen that is generated is lighted at hydrogen outlet; The chlorine and the reaction of water wherein that are admitted in the chlorine tourie 12 generate the hydrogenchloride and the hypochlorous aqueous solution;
2. the hydrogenchloride that generates in the chlorine tourie 12 and the hypochlorous aqueous solution flow in the oxidation pond 2 and sneak into dyeing waste water through pipeline.Oxidation pond 2 has selective oxidation district 21, diffusible oxydation district 22 and the mixing zone 23 that links to each other successively, and selective oxidation district 21 is positioned at the waterwater entrance place of oxidation pond 2, and the bottom in selective oxidation district 21 is positioned at the middle part of diffusible oxydation district 22 and mixing zone 23; Be provided with isolating bar 21-1 between the bottom in selective oxidation district 21 and the diffusible oxydation district 22.Be concrete structure, stud with acid-proof ceramic tile at the bottom of wall and the pond, selective oxidation district 21 is wide 1 meter, and long 4 meters, 50 millimeters of the depth of waters, spreading area 22 is wide 1 meter, and long 4 meters, dark 2 meters; Mixing zone 23 is wide 4 meters, and long 8 meters, dark 2 meters.When the hydrogenchloride and the hypochlorous aqueous solution flow into oxidation pond 2, flow into the selective oxidation district 21 of oxidation pond 2 earlier through liquid distributor 24, when the hydrogenchloride and the hypochlorous aqueous solution and dyeing waste water generation oxygenizement, part chromophoric group in the dyeing waste water and part auxochrome group generation oxidizing reaction and decolour, after dyeing waste water flowed into diffusible oxydation district 22, hypochlorous acid made the further oxidation of dyeing waste water.Mix through stirrer, after dyeing waste water enters mixing zone 23, utilize hydrionic coagulation and make the micelle coagulation in the dyeing waste water become particle, this moment, the pH value of dyeing waste water was 3 to 5.
3. the waste water in the oxidation pond 2 is squeezed into pressure filter 3 with oxidation pond Send out pump 81 and filter, pressure filter adopts 500 order acid-fast alkali-proof filter clothes, and the filter cloth surface has the coagulating agent layer that is applied by 1% polyacrylamide solution, and pressure filter pressure is 2 kilograms every square centimeter.The filter cloth surface is provided with one deck polyacrylamide layer, not only can cause further coagulation to the negative electricity micelle in the dyeing waste water, and the mesh that has partly stopped up filter cloth because of coagulum further improves filter effect.Filtrate enters pH value equalizing tank 4, and filtrate is apparent at this moment is coloured limpid; The mud that stays on the filter screen is waited for that then its arrival is a certain amount of and is scraped back dehydration outward transport.
4. the pH regulator pond is a concrete structure, and is wide 4 meters, and long 8 meters, dark 2 meters, the bottom, pond is equipped with the plastics aeration flexible pipe.In the filtrate in pH value equalizing tank 4, under the state of blast aeration, the sodium hydroxide solution in the sodium hydroxide solution basin 13 is added in the pH value equalizing tank 4 by pipeline, make pH adjust that pH value of filtrate reaches 6 to 7 in the pond 4; Putting into filtrate in pH value equalizing tank 4 when, also the sanitary sewage with factory feeds simultaneously, with aeration the waste water in the pH regulator pond 4 is mixed, and increases oxygen dissolution amount in the waste water, and the gas-water ratio of aeration is 10: 1.
5. aerobic biochemical pond 5 is a concrete structure, wide 8 meters, and long 12 meters, dark 4 meters, aeration flexible pipe is installed at the bottom of the pond, the water outlet in pond is equipped with long 70 centimetres, 70 high 30 centimetres mesh filter screens.Bacterial classification in the aerobic biochemical pond is an aerobic bacteria, purchases in raising sub-petrochemical industry, cultivates domestication 20 days.The waste water that regulates the pH value is squeezed in the aerobic biochemical pond 5 from pH value equalizing tank 4 with aerobic biochemistry pool front pump 82, under the state of waste water blast aeration in the pond, waste water is carried out biochemical treatment by the microorganism in the pond; The gas-water ratio of aeration was 25: 1, added an amount of nitrogenous fertilizer and phosphate fertilizer every 1 hour, and will export the microbe granular of holding back on the filter screen and shovel into aerobic biochemical pond 5.
6. settling tank 6 is a concrete structure, and is wide 4 meters, long 8 meters, and dark 4 meters.Make it flow into settling tank 6 to the waste water of handling through aeration, the hydrogenchloride and the hypochlorous aqueous solution that generates in 1 hour sprays into by chlorine tourie 12 with spraying machine is killed the microorganism in the settling tank simultaneously;
7. the waste water in the settling tank 6 is left standstill, until its precipitation fully, the supernatant liquid qualified discharge, lower floor's mud is squeezed into pressure filter 3 with sludge pump 83 and is filtered.
The colourity of above-mentioned dyeing waste water before processing is 500 to 1000 extension rates, and SS is 200 to 500 milligrams every liter, and COD is 1300 milligrams every liter, and sulfide is 80 milligrams every liter.The colourity of the waste water after the process system handles of the present invention is smaller or equal to 40 extension rates, and SS is smaller or equal to 50 milligrams every liter, and COD is smaller or equal to 80 milligrams every liter, and sulfide is smaller or equal to 1 milligram every liter.
(embodiment 2)
See Fig. 1 to Fig. 8, all the other are identical with embodiment 1, difference is: the system of present embodiment is used for the processing of the dyeing waste water of other printing and dyeing workshop, this printing and dyeing workshop has the quadruplet dyeing machine, use basic dyestuff and dispersed dye, about 300 tons of day waste discharge water yield, waste water is apparent to be black, yellow, redness, brown etc.The system of present embodiment also has topping-up pump 14 and hydrogen basin 15; The hydrogen delivery port of sodium chloride electrolysis groove 11 links to each other with the inlet of topping-up pump 14, and the link to each other hydrogen of electrolytic saltwater gained of the outlet of topping-up pump 14 and hydrogen basin 15 inlets is transported to hydrogen basin 15 with topping-up pump 14.In the system of present embodiment, the selective oxidation district 21 of oxidation pond 2 is wide 1 meter, and long 6 meters, 50 millimeters of the depth of waters, spreading area 22 is wide 1 meter, and long 5 meters, dark 2 meters; Mixing zone 23 is wide 6 meters, and long 10 meters, dark 2 meters.Has the coagulating agent layer that applies by 1.5% polyacrylamide solution on the acid-fast alkali-proof filter cloth surface of pressure filter 3.The width in the pH regulator pond 4 in the system is 8 meters, and length is 8 meters, is 2 meters deeply.The width in the aerobic biochemical pond 5 in the system is 10 meters, and length is 16 meters, is 4 meters deeply, and the filter screen at 5 water outlet places, aerobic biochemical pond is 60 purpose filter screens.The width of the settling tank 6 in the system is 8 meters, and length is 10 meters, and the degree of depth is 4 meters.
The colourity of this dyeing waste water before processing is 700 to 1000 extension rates, and SS is 230 to 450 milligrams every liter, and COD is 1400 milligrams every liter.The colourity of the waste water after the process system handles of present embodiment is smaller or equal to 40 extension rates, and SS is smaller or equal to 40 milligrams every liter, and COD is smaller or equal to 70 milligrams every liter.
Claims (10)
1, a kind of textile printing and dyeing wastewater treatment system is characterized in that: have sodium chloride electrolysis groove (11), chlorine tourie (12), sodium hydroxide solution basin (13), oxidation pond (2), pressure filter (3), pH value equalizing tank (4), aerobic biochemical pond (5), settling tank (6), blower fan (7), oxidation pond Send out pump (81), aerobic biochemical pond front pump (82) and sludge pump (83); Sodium chloride electrolysis groove (11) has sodium chloride aqueous solution input interface, water input interface, chlorine output interface, aqueous sodium hydroxide solution output interface and hydrogen delivery port; Chlorine tourie (12) has chlorine input interface, water input interface, hydrochloric acid and hypochlorous mixed solution output interface; Sodium hydroxide solution basin (13) has input interface and output interface; Oxidation pond (2) has waterwater entrance and wastewater outlet; Pressure filter (3) has waterwater entrance, mud inlet and wastewater outlet; Aerobic biochemical pond (5) has waterwater entrance and wastewater outlet; Settling tank (6) has waterwater entrance and wastewater outlet; The chlorine output interface of sodium chloride electrolysis groove (11) connects the chlorine input interface of chlorine tourie (12) by pipeline; The aqueous sodium hydroxide solution output interface of sodium chloride electrolysis groove (11) connects the input interface of sodium hydroxide solution basin (13) by pipeline; The hydrochloric acid of chlorine tourie (12) and hypochlorous mixed solution output interface are connected with pipeline, and the outlet of this pipeline is arranged on the waterwater entrance place of oxidation pond (2); The wastewater outlet of oxidation pond (2) connects the waterwater entrance of pressure filter (3) by pipeline and oxidation pond Send out pump (81); The wastewater outlet of pressure filter (3) is connected with pipeline, and the outlet of this pipeline is arranged on the top of pH value equalizing tank (4); An output interface of sodium hydroxide solution basin (13) is connected with pipeline, and the outlet of this pipeline is arranged on the top of pH value equalizing tank (4); The water inlet pipe of aerobic biochemical pond front pump (82) is arranged in the pH value equalizing tank (4), and the outlet of aerobic biochemical pond front pump (82) pipeline that output interface connected is arranged on the waterwater entrance place in aerobic biochemical pond (5); The wastewater outlet in aerobic biochemical pond (5) communicates by the waterwater entrance of connecting passage with settling tank (6); Be provided with the sludge pipe of inlet at the bottom of near the pond in the settling tank (6), the outlet of sludge pipe links to each other with the inlet of sludge pump (83) by coupled pipeline, and the outlet of sludge pump (83) is connected with pipeline, and the outlet of this pipeline enters the mouth with the mud of pressure filter (3) and links to each other; The air outlet of blower fan (7) is connected with pipeline, and this pipeline has two pipeline air outlets, and one in two air outlets is arranged in pH value equalizing tank (4), and another is arranged in aerobic biochemical pond (5).
2, textile printing and dyeing wastewater treatment system according to claim 1 is characterized in that: native system also has topping-up pump (14) and hydrogen basin (15); The hydrogen delivery port of sodium chloride electrolysis groove (11) links to each other with the inlet of topping-up pump (14), and the outlet of topping-up pump (14) links to each other with hydrogen basin (15) inlet.
3, textile printing and dyeing wastewater treatment system according to claim 1 is characterized in that: sodium hydroxide solution basin (13) also is provided with second output interface, and this output interface adds groove by pipeline with the sodium hydroxide solution of printing and dyeing workshop and links to each other.
4, textile printing and dyeing wastewater treatment system according to claim 1 is characterized in that: also have stirrer (25); Oxidation pond (2) has selective oxidation district (21), diffusible oxydation district (22) and mixing zone (23) that link to each other successively, selective oxidation district (21) is positioned at the waterwater entrance place of oxidation pond (2), and the bottom of selective oxidation district (21) is positioned at the middle part of diffusible oxydation district (22) and mixing zone (23); Be provided with isolating bar (21-1) between the bottom in selective oxidation district (21) and diffusible oxydation district (22); Be provided with divider wall (22-1) between diffusible oxydation district (22) and mixing zone (23), and be provided with the waste water through port at the middle part of divider wall (22-1); Stirrer (25) is arranged on the waste water through port place of oxidation pond (2), and the overall dimension of the impeller of stirrer (25) is slightly less than the width of waste water through port.
5, textile printing and dyeing wastewater treatment system according to claim 4, it is characterized in that: the ingress, selective oxidation district (21) of oxidation pond (2) is provided with liquid distributor (24), liquid distributor (24) is positioned at the middle part or the bottom in selective oxidation district (21), is communicated with chlorine tourie (12) through pipeline and valve; Liquid distributor (24) surface is provided with fluid hole.
6, textile printing and dyeing wastewater treatment system according to claim 1 is characterized in that: the filter cloth surface of pressure filter (3) scribbles one deck by water-soluble polyacrylamide layer; 50 order to 100 purpose filter screens are equipped with in the exit in aerobic biochemical pond (5).
7, a kind of textile printing and dyeing wastewater treatment process has following steps: 1. the sodium chloride aqueous solution electrolysis in the sodium chloride electrolysis groove (11) is generated chlorine and aqueous sodium hydroxide solution; The aqueous sodium hydroxide solution that generated flows into sodium hydroxide solution basin (13), and the chlorine that is generated is admitted to chlorine tourie (12), and the hydrogen that is generated pumps into the hydrogen basin or lights at hydrogen outlet from hydrogen outlet; The chlorine and the reaction of water wherein that are admitted in the chlorine tourie (12) generate the hydrogenchloride and the hypochlorous aqueous solution; 2. the hydrogenchloride that generates in the chlorine tourie (12) and the hypochlorous aqueous solution flow in the oxidation pond (2) and enter dyeing waste water through pipeline, with part chromophoric group in the dyeing waste water and part auxochrome group generation oxidizing reaction and make decolorizing printing and dyeing waste water, and utilize hydrogen ion with positive charge make the micelle coagulation in the waste water become particle; 3. the waste water in the oxidation pond (2) is squeezed into pressure filter (3) with oxidation pond Send out pump (81) and filter, filtrate enters pH value equalizing tank (4); The mud that stays on the filter screen is waited for that then its arrival is a certain amount of and is scraped back dehydration outward transport; 4. under the state of the waste water air blast in pH value equalizing tank (4), the sodium hydroxide solution in the sodium hydroxide solution basin (13) is added to the pH value of adjusting waste water in the pond in the pH value equalizing tank (4) by pipeline reach 6 to 8; The waste water that 5. will regulate the pH value is squeezed into aerobic biochemical pond (5) with aerobic biochemistry pool front pump (82) from pH value equalizing tank (4), under the state of waste water blast aeration in the pond, by the microorganism in the pond waste water is carried out biochemical treatment; 6. make it flow into settling tank (6) to the waste water of handling through aeration, feed the hydrogenchloride and the hypochlorous aqueous solution that in chlorine tourie (12), generate simultaneously, waste water is carried out germicidal treatment; 7. the waste water in the settling tank (6) is left standstill, until its precipitation fully, the supernatant liquid qualified discharge, lower floor's mud is squeezed into pressure filter (3) with sludge pump (83) and is filtered.
8, textile printing and dyeing wastewater treatment process according to claim 7, it is characterized in that: the oxidation pond (2) of step in 2. has selective oxidation district (21), diffusible oxydation district (22) and mixing zone (23) that link to each other successively, selective oxidation district (21) is positioned at the waterwater entrance place of oxidation pond (2), and the bottom of selective oxidation district (21) is positioned at the middle part of diffusible oxydation district (22) and mixing zone (23); Be provided with isolating bar (21-1) between the bottom in selective oxidation district (21) and diffusible oxydation district (22); When the hydrogenchloride and the hypochlorous aqueous solution flow into oxidation pond (2), earlier in selective oxidation district (21) and dyeing waste water generation oxygenizement, after dyeing waste water flows into diffusible oxydation district (22), hypochlorous acid makes the further oxidation of dyeing waste water, mix through stirrer, after dyeing waste water entered mixing zone (23), then because of hydrionic existence makes dyeing waste water generation coagulation, this moment, the pH value of dyeing waste water was 3 to 6.
9, textile printing and dyeing wastewater treatment process according to claim 7, it is characterized in that: the 3. middle used filter cloth surface of pressure filter (3) of step scribbles one deck by water-soluble polyacrylamide layer, not only can bring into play further coagulation, and the mesh that has partly stopped up filter cloth because of coagulum further improves filter effect to the electronegative micelle in the dyeing waste water; Step is provided with 50 order to 100 purpose filter screens in the exit of aerobic biochemical pond (5) in 5., can effectively tackle mud and prevent that it from entering settling tank (6).
10, textile printing and dyeing wastewater treatment process according to claim 7, it is characterized in that: step adds the sanitary sewage of factory in 4. in pH value equalizing tank (4), can participate in adjusting to the pH value, increased the 5. middle nutriment of supplying with aerobic bacteria of step, and made this treatment process handling in the lump sanitary sewage.
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| CN101164923B (en) * | 2007-07-13 | 2010-08-11 | 绍兴水处理发展有限公司 | Integrated printing and dyeing waste water treatment process |
| CN101774715B (en) * | 2010-03-10 | 2013-02-27 | 华南师范大学 | System and method for advanced treatment and reuse of dyeing wastewater |
| CN102225826A (en) * | 2011-05-10 | 2011-10-26 | 浙江永泉化学有限公司 | Decolorization and phosphorus reduction method for high-concentration phosphorus-containing wastewater from quinacridone pigment production process |
| CN102276033A (en) * | 2011-06-13 | 2011-12-14 | 金东纸业（江苏）股份有限公司 | Method for treating coating waste water |
| CN102381810A (en) * | 2011-09-21 | 2012-03-21 | 叶永祥 | Recycling process for printing and dyeing waste water |
| CN103193299A (en) * | 2012-01-09 | 2013-07-10 | 桂雷珠 | High-voltage electrostatic field seawater desalination plant |
| CN102976474A (en) * | 2012-12-24 | 2013-03-20 | 天津工业大学 | Method for removing sulfur and organic matters in industrial sewage |
| CN106116027B (en) * | 2016-07-19 | 2018-11-09 | 环境保护部南京环境科学研究所 | Treatment method of printing and dying wastewater and its device |
| CN110713290A (en) * | 2018-07-13 | 2020-01-21 | 中国石油化工股份有限公司 | High-salt-content evaporation mother liquor recycling treatment system and method |
| CN109112743B (en) * | 2018-08-01 | 2021-01-08 | 嘉兴市金乐染织有限公司 | Front-section recycling system of dyeing and weaving reclaimed water and method for treating printing and dyeing and weaving wastewater |
| CN110551552B (en) * | 2019-10-15 | 2021-01-12 | 山西焦煤集团有限责任公司 | Process method for eliminating G value of electric coal |
| CN111675442A (en) * | 2020-06-28 | 2020-09-18 | 潮州市中乾环境科技有限公司 | Low-cost environment-friendly printing and dyeing wastewater treatment process |
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