CN100548897C - The treatment process of anionic dye printing and dyeing wastewater - Google Patents
The treatment process of anionic dye printing and dyeing wastewater Download PDFInfo
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- CN100548897C CN100548897C CNB200710150106XA CN200710150106A CN100548897C CN 100548897 C CN100548897 C CN 100548897C CN B200710150106X A CNB200710150106X A CN B200710150106XA CN 200710150106 A CN200710150106 A CN 200710150106A CN 100548897 C CN100548897 C CN 100548897C
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Abstract
The treatment process of anionic dye printing and dyeing wastewater of the present invention belongs to field of waste water treatment, and it is to handle anionic dye printing and dyeing wastewater with foam separating technology, and concrete steps are as follows: the first step, the collection of anionic dye printing and dyeing wastewater and detection; Second step, the anionic dye printing and dyeing wastewater pre-treatment; In the 3rd step, foam separation circulation decolorization is to add the cats product cetyl trimethylammonium bromide in anionic dye printing and dyeing wastewater, carries out decolorization in bubble tower four times; The 4th step, evaporative crystallization.Technology equipment used of the present invention is simple, less investment, power consumption are little, easy to operate, and not only high the and treatment effect of chroma removal rate fluctuates for a short time, and obtains being applied to once more the thick product of dyestuff of dyeing process simultaneously.
Description
Technical field
Technical scheme of the present invention belongs to field of waste water treatment, specifically the treatment process of anionic dye printing and dyeing wastewater.
Background technology
Dyeing is the industrial wastewater discharge rich and influential family, and the waste water of its discharging has that the water yield is big, organic contamination substrate concentration height, colourity is dark, biodegradability is relatively poor, change of water quality is big, and the characteristics of complicated component, one of more unmanageable trade effluent of genus.At present, the main method that is used for treatment of dyeing wastewater has physico-chemical process, biochemical process and two kinds of treatment processs that technology combines.
It is longer that physico-chemical process is applied to time of treatment of dyeing wastewater.CN1760143A discloses " dyeing waste water coagulation air-float precipitation treatment method and integrated apparatus thereof ", and this patent adopts coagulation air-float precipitation integral treatment process, and adding medicine is Tai-Ace S 150, high-efficiency decolorant and polyacrylamide; CN1884119A discloses " a kind of high-concentration printing and dyeing wastewater treatment process ", and this patent adopts coagulation, adds magnetic fluid, flocculation and filtering method.Big and the generation secondary pollution of these physico-chemical process occupation area of equipment.
Industrial independent use biochemical process comes treatment of dyeing and printing actually rare, is used in combination with physico-chemical process often.CN1762861A discloses " printing-dyeing waste water treatment process ", this patent be with dyeing waste water after overregulating the pH value, adopt the heavy and dewatered sludge technologies of coagulation air-float, anaerobism, anoxic, aeration, mud two to handle waste water successively.Biochemical process has two big shortcomings, and the one, chroma removal rate is not high, and the 2nd, biophase instability, treatment effect fluctuation are greatly.And the Physiochemical and biochemical combined techniques exists complex process and the higher shortcoming of cost.
CN1544118A has disclosed " surfactant-based foam separation and abolish technology and production line ", this patented technology utilizes foam separating tower to carry out foam separation, utilize the moisture of carrying secretly in the gas-liquid separator scumming,, realize the tensio-active agent foam separation and abolish with the broken bubble of bulb-breaking device.Though this patent documentation mentions that this method is used to dyeing and carries out wastewater treatment, not to the processing essentiality content of dyeing waste water, just mention in the literary composition.
At present, do not see bibliographical information as yet with the technology of foam separating technology processing anionic dye waste water.
Summary of the invention
Technical problem to be solved by this invention is: the treatment process that a kind of anionic dye printing and dyeing wastewater is provided, it is to handle anionic dye printing and dyeing wastewater with foam separating technology, it is big and produce secondary pollution to have overcome the physico-chemical process occupation area of equipment, the biochemical process chroma removal rate is not high and the treatment effect fluctuation is big, and the Physiochemical and biochemical combined techniques exists complex process and the higher shortcoming of cost.
The present invention solves this technical problem the technical scheme that is adopted: the treatment process of anionic dye printing and dyeing wastewater of the present invention, and it is to handle anionic dye printing and dyeing wastewater with foam separating technology, concrete steps are as follows:
The first step, the collection of anionic dye printing and dyeing wastewater and detection
Collect the anionic dye printing and dyeing wastewater of printing and dyeing mill, detect wherein contained main coloring matter composition and volumetric molar concentration, COD value, colourity and pH value with known method;
Second step, the anionic dye printing and dyeing wastewater pre-treatment
The pH value of regulating the described anionic dye printing and dyeing wastewater of the first step with hydrochloric acid is 4.0～7.0, and it is divided into four batches;
The 3rd step, foam separation circulation decolorization
The 1st decolouring, in pretreated first batch of anionic dye printing and dyeing wastewater of second step, add cats product cetyl trimethylammonium bromide (hereinafter referred to as CTAB), in the CTAB that adds and this anionic dye printing and dyeing wastewater mol ratio of contained coloring matter be 1.5～2.69: 1, carry out the 1st decolouring with bubble tower, temperature is 15～45 ℃, and the gas volume flow velocity is 0.02～0.05m
3/ hour, foam layer height is 0.6～0.8m, with broken foam method foam layer is broken foam, the one-period operating time is 15～20 minutes, anionic dye printing and dyeing wastewater colourity decreasing ratio is greater than 97%, the COD decreasing ratio is greater than 88%, anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, foam layer obtains brokenly foam liquid through broken foam, filters and should break foam liquid, and the gained solid is the thick product of dyestuff, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 2nd decolouring;
The 2nd decolouring, the filtrate of the 1st decolouring gained is joined in pretreated second batch of anionic dye printing and dyeing wastewater of second step, add the partial cation Surfactant CTAB again, the mol ratio of the contained coloring matter of anionic dye printing and dyeing wastewater of the CTAB that adds and second batch is 0.8～1.2: 1, carry out the 2nd decolouring with bubble tower, temperature, the gas volume flow velocity, foam layer height and cycleoperation time are all identical with the 1st decolouring, anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of dyestuff, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 3rd decolouring;
The 3rd decolouring, the filtrate of the 2nd decolouring gained is joined in pretreated the 3rd batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 3rd decolouring, the anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of dyestuff, will be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 4th decolouring;
The 4th decolouring, the filtrate of the 3rd decolouring gained is joined in pretreated the 4th batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 4th decolouring, this anionic dye printing and dyeing wastewater colourity decreasing ratio still is not less than 97.0%, the COD decreasing ratio is greater than 85%, anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of dyestuff, will be applied to once more in the dyeing process, the filtrate of collecting is carried out next step evaporative crystallization handle;
The 4th step, evaporative crystallization
The filtrate of the 4th decolouring back collection is carried out evaporative crystallization to the 3rd step, and the crystallization precipitate of collecting is the thick product of dyestuff, and this thick product will be applied in the dyeing process once more.
In the treatment process of above-mentioned anionic dye printing and dyeing wastewater, described broken foam method is known mechanical process, hot froth breaking method or electric field method.
The invention has the beneficial effects as follows: foam separating technology is a kind of special unit processes in chemical synthesis, and it is according to the surface adsorption principle, thereby based on surface-active difference between solute in the solution or particle it is separated.Foam separating technology obtains increasingly extensive application in the fields such as extraction of environmental protection, biological substance.The advantage of foamet is to be fit to the Separation and Recovery of lower concentration material, and equipment used is simple, less investment, power consumption are little, easy to operate.Processing method of the present invention is applied to foam separating technology among the processing of anionic dye printing and dyeing wastewater first, the coloring matter that not only removes in the anionic dye printing and dyeing wastewater is better than other existing anionic dye printing and dyeing wastewater treatment process, and obtains being applied to once more the thick product of dyestuff of dyeing process simultaneously.Below be to the more detailed narration of the inventive method beneficial effect.
1. can significantly reduce secondary pollution.At present, dye printing and dyeing wastewater is handled the industrial coagulating agent that adds and is divided two kinds of inorganic salts (as Tai-Ace S 150, alum, iron trichloride) and high-molecular coagulant adoptings (as aluminium chlorohydroxide, polyacrylamide).No matter adopt any class coagulating agent, after air supporting or precipitation process, all can produce a large amount of solid waste, produce secondary pollution.The medicine that the inventive method adds is a tensio-active agent, and the thick product of dyestuff that the broken foam liquid that produces obtains after treatment is applied to dyeing process once more, thereby has avoided the generation of a large amount of solid waste.
2. treating processes is easy to operate.Decoloration process main device of the present invention is a foam separation bleaching tower, i.e. bubble tower, and floor space is little, only need control pH value, volumes of gas flow velocity, foam layer height, surfactant concentration during operation well to get final product, and is easy to operate.
3. chroma removal rate height and treatment effect fluctuation are little.The single decolouring cycle of decoloration process of the present invention is 15～20 minutes, and the full cycle decolorization can be finished in 60～80 minutes, and its colourity goes the rate of taking off greater than 97% during single decolouring, and the COD decreasing ratio is not less than 85%.
Embodiment
Embodiment 1
The first step, the collection of anionic dye printing and dyeing wastewater and detection
Collect certain printing and dyeing mill's waste water, the main coloring matter composition of this anionic dye printing and dyeing wastewater is a tropeolin-D after testing, and the volumetric molar concentration of tropeolin-D is 9.16 * 10
-5Mol/L, COD 600mg/L, 950 times of colourities, pH is 9.20;
Second step, the anionic dye printing and dyeing wastewater pre-treatment
The pH value of regulating the described anionic dye printing and dyeing wastewater of the first step with hydrochloric acid is 6.0, and it is divided into four batches;
The 3rd step, foam separation circulation decolorization
The 1st decolouring, in pretreated first batch of anionic dye printing and dyeing wastewater of second step, add cats product CTAB, the mol ratio of tropeolin-D is 2.70: 1 in CTAB that is added and the anionic dye printing and dyeing wastewater, carry out the 1st decolouring with bubble tower, 30 ℃ of temperature, gas volume flow velocity are 0.04m
3/ hour, foam layer height is 0.6m, with hot froth breaking method foam layer is broken foam, the one-period operating time is 15 minutes, anionic dye printing and dyeing wastewater colourity decreasing ratio reaches 99.6%, and the COD decreasing ratio is 93.3%, and processed waste water reaches the GB4287-92 requirement, can directly discharge, foam layer obtains brokenly foam liquid through broken foam, filters and should break foam liquid, and the gained solid is the thick product of methyl orange dye, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 2nd decolouring;
The 2nd decolouring, the filtrate of the 1st decolouring gained is joined in pretreated second batch of anionic dye printing and dyeing wastewater of second step, add the partial cation Surfactant CTAB again, the mol ratio of the contained tropeolin-D of anionic dye printing and dyeing wastewater of the CTAB that adds and second batch is 0.8: 1, carry out the 2nd decolouring with bubble tower, temperature, the gas volume flow velocity, foam layer height and cycleoperation time are all identical with the 1st decolouring, the one-period operating time of the 2nd decolouring is 15 minutes, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of methyl orange dye, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 3rd decolouring;
The 3rd decolouring, the filtrate of the 2nd decolouring gained is joined in pretreated the 3rd batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 3rd decolouring, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of methyl orange dye, will be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 4th decolouring;
The 4th decolouring, the filtrate of the 3rd decolouring gained is joined in pretreated the 4th batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 4th decolouring, the colourity decreasing ratio of this anionic dye printing and dyeing wastewater is 97.5%, the COD decreasing ratio is 90%, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of methyl orange dye, will be applied to once more in the dyeing process, the filtrate of collecting is carried out next step evaporative crystallization handle;
The 4th step, evaporative crystallization
The filtrate of the 4th decolouring back collection is carried out evaporative crystallization to the 3rd step, and the crystallization precipitate of collecting is the thick product of tropeolin-D, and the thick product of this tropeolin-D will be applied in the dyeing process once more.
Be that the thick product of this tropeolin-D is applied to the painted embodiment of cotton once more below.
Cotton dyeing, the thick product concentration 3.0% of dyestuff, bath raio 1% adds NaCl 10g/L and urgees to dye 40～45 ℃ of dyeing temperatures, dyeing time 25 minutes; Add Na
2CO
35g/L, 45 minutes fixation time; Regulating the pH value with HAc is 5.5～6.0, heats up 85 ℃, continuous dying 50 minutes, and the result is as shown in table 1.
Table 1
| Content | Dye uptake | Soaping fastness | Dry fastness | Fastness to wet rubbing |
| Tropeolin-D | 90％ | 3～4 | 3～4 | 3～4 |
| The thick product of tropeolin-D | 86％ | 3～4 | 2～3 | 2～3 |
Crock fastness measuring method in the dyefastness: experimental technique is with reference to GB 3920-83; Soaping fastness in the dyefastness: experimental technique is with reference to GB 3921-83.
As shown in Table 1, during dyeing, the colour fastness of the thick product of this tropeolin-D and dye uptake and tropeolin-D are basic identical, thereby can be used as the printing and dyeing coarse raw materials, are applied to dyeing process once more.
Embodiment 2
The first step, the collection of anionic dye printing and dyeing wastewater and detection
Collect certain printing and dyeing mill's waste water, the main coloring matter composition of this anionic dye printing and dyeing wastewater is the blue black R of chromium after testing, and the volumetric molar concentration of the blue black R of chromium is 4.8 * 10
-5Mol/L, COD 750mg/L, 850 times of colourities, pH is 11.2;
Second step, the anionic dye printing and dyeing wastewater pre-treatment
The pH value of regulating the described anionic dye printing and dyeing wastewater of the first step with hydrochloric acid is 4.0, and it is divided into four batches;
The 3rd step, foam separation circulation decolorization
The 1st decolouring, in pretreated first batch of anionic dye printing and dyeing wastewater of second step, add cats product CTAB, the mol ratio of the blue black R of chromium is 2.23: 1 in CTAB that is added and the anionic dye printing and dyeing wastewater, carry out the 1st decolouring with bubble tower, 15 ℃ of temperature, gas volume flow velocity are 0.05m
3/ hour, foam layer height is 0.7m, with electric field method foam layer is broken foam, the one-period operating time is 20 minutes, anionic dye printing and dyeing wastewater colourity decreasing ratio reaches 98%, and the COD decreasing ratio is 90.7%, and processed waste water reaches the GB4287-92 requirement, can directly discharge, foam layer obtains brokenly foam liquid through broken foam, filters and should break foam liquid, and the gained solid is the blue black thick product of R dyestuff of chromium, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 2nd decolouring;
The 2nd decolouring, the filtrate of the 1st decolouring gained is joined in pretreated second batch of anionic dye printing and dyeing wastewater of second step, add the partial cation Surfactant CTAB again, the mol ratio of the blue black R of the contained chromium of the anionic dye printing and dyeing wastewater of the CTAB that adds and second batch is 1: 1, carry out the 2nd decolouring with bubble tower, temperature, the gas volume flow velocity, foam layer height and cycleoperation time are all identical with the 1st decolouring, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the blue black thick product of R dyestuff of chromium, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 3rd decolouring;
The 3rd decolouring, the filtrate of the 2nd decolouring gained is joined in pretreated the 3rd batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 3rd decolouring, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the blue black thick product of R dyestuff of chromium, will be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 4th decolouring;
The 4th decolouring, the filtrate of the 3rd decolouring gained is joined in pretreated the 4th batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 4th decolouring, the colourity decreasing ratio of this anionic dye printing and dyeing wastewater is 97%, the COD decreasing ratio is 86.4%, processed waste water reaches the GB4287-92 requirement, directly discharging, collecting broken foam liquid filters, the gained solid is the blue black thick product of R dyestuff of chromium, will be applied to once more in the dyeing process, the filtrate of collecting is carried out next step evaporative crystallization handle;
The 4th step, evaporative crystallization
The filtrate of the 4th decolouring back collection is carried out evaporative crystallization to the 3rd step, and the crystallization precipitate of collecting is the blue black thick product of R of chromium, and the blue black thick product of R of this chromium will be applied in the dyeing process once more.
Be that the blue black thick product of R of this chromium is applied to the painted embodiment of knitting wool once more below.
Knitting wool dyeing, the thick product concentration 3.0% of dyestuff, bath raio 1% adds NaCl 10g/L and urgees to dye 40～45 ℃ of dyeing temperatures, dyeing time 25 minutes; Add Na
2CO
35g/L, 45 minutes fixation time; Regulating the pH value with HAc is 5.0～5.5, heats up 90 ℃, continuous dying 50 minutes, and the result is as shown in table 2.
Table 2
| Content | Dye uptake | Soaping fastness | Dry fastness | Fastness to wet rubbing |
| The blue black R of chromium | 95％ | 4～5 | 4～5 | 3～4 |
| The blue black thick product of R of chromium | 92％ | 3～4 | 4～5 | 2～3 |
The dyefastness measuring method is with embodiment 1.
As shown in Table 2, during dyeing, blue black R is basic identical for the colour fastness of the blue black thick product of R of this chromium and dye uptake and chromium, thereby can be used as the printing and dyeing coarse raw materials, is applied to dyeing process once more.
Embodiment 3
The first step, the collection of anionic dye printing and dyeing wastewater and detection
Collect certain printing and dyeing mill's waste water, the main coloring matter composition of this anionic dye printing and dyeing wastewater is an Acid Brilliant Scarlet GR after testing, and the volumetric molar concentration of acid scarlet is 7.19 * 10
-5Mol/L, COD 800mg/L, 1100 times of colourities, pH is 8.5;
Second step, the anionic dye printing and dyeing wastewater pre-treatment
The pH value of regulating the described anionic dye printing and dyeing wastewater of the first step with hydrochloric acid is 7.0, and it is divided into four batches;
The 3rd step, foam separation circulation decolorization
The 1st decolouring, add cats product CTAB in pretreated first batch of anionic dye printing and dyeing wastewater of second step, the mol ratio of Acid Brilliant Scarlet GR is 1.49: 1 in CTAB that is added and the waste water, carries out the 1st decolouring with bubble tower, 45 ℃ of temperature, gas volume flow velocity are 0.02m
3/ hour, foam layer height is 0.8m, with mechanical process foam layer is broken foam, the one-period operating time is 20 minutes, anionic dye printing and dyeing wastewater colourity decreasing ratio can reach 98.2%, and the COD decreasing ratio is 88.75%, and processed waste water reaches the GB4287-92 requirement, can directly discharge, foam layer obtains brokenly foam liquid through broken foam, filters and should break foam liquid, and the gained solid is the thick product of Acid Brilliant Scarlet GR dyestuff, to be applied in the dyeing process once more, and the filtrate of collecting is carried out the 2nd decolouring;
The 2nd decolouring, the filtrate of the 1st decolouring gained is joined in pretreated second batch of anionic dye printing and dyeing wastewater of second step, add the partial cation Surfactant CTAB again, the mol ratio of the contained Acid Brilliant Scarlet GR of anionic dye printing and dyeing wastewater of the CTAB that adds and second batch is 1.2: 1, carry out the 2nd decolouring with bubble tower, temperature, the gas volume flow velocity, foam layer height and cycleoperation time are all identical with the 1st decolouring, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of Acid Brilliant Scarlet GR dyestuff, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 3rd decolouring;
The 3rd decolouring, the filtrate of the 2nd decolouring gained is joined in pretreated the 3rd batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 3rd decolouring, processed waste water reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of Acid Brilliant Scarlet GR dyestuff, will be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 4th decolouring;
The 4th decolouring, the filtrate of the 3rd decolouring gained is joined in pretreated the 4th batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 4th decolouring, this anionic dye printing and dyeing wastewater colourity decreasing ratio is 97.8%, the COD decreasing ratio is 85%, processed waste water reaches the GB4287-92 requirement, directly discharging, the gained solid is the thick product of Acid Brilliant Scarlet GR dyestuff, to be applied to once more in the dyeing process, the filtrate of collecting be carried out next step evaporative crystallization handle;
The 4th step, evaporative crystallization
The filtrate of the 4th decolouring back collection is carried out evaporative crystallization to the 3rd step, and the crystallization precipitate of collecting is the thick product of Acid Brilliant Scarlet GR, and the thick product of this Acid Brilliant Scarlet GR will be applied in the dyeing process once more.
Be that the thick product of this Acid Brilliant Scarlet GR is applied to the painted embodiment of thick cloth once more below.
In neutrality is bathed, thick cloth dyeing, the thick product concentration 3.0% of dyestuff, bath raio 1% adds NaCl 10g/L and urgees to dye 55～60 ℃ of dyeing temperatures, dyeing time 25 minutes; Add Na
2CO
35g/L, 40 minutes fixation time; Regulating the pH value with HAc is 4.0～4.5, heats up 90 ℃, continuous dying 50 minutes, and the result is as shown in table 3.
Table 3
| Content | Dye uptake | Soaping fastness | Dry fastness | Fastness to wet rubbing |
| Acid Brilliant Scarlet GR | 93％ | 4～5 | 4～5 | 3～4 |
| The thick product of Acid Brilliant Scarlet GR | 90％ | 4～5 | 3～4 | 2～3 |
The dyefastness measuring method is with the 4th step of embodiment 1.
As shown in Table 3, during dyeing, the colour fastness of the thick product of this Acid Brilliant Scarlet GR dyestuff and dye uptake and Acid Brilliant Scarlet GR are basic identical, thereby can be used as the printing and dyeing coarse raw materials, are applied to dyeing process once more.
Claims (2)
1. the treatment process of anionic dye printing and dyeing wastewater, it is characterized in that: it is to handle anionic dye printing and dyeing wastewater with foam separating technology, and concrete steps are as follows:
The first step, the collection of anionic dye printing and dyeing wastewater and detection
Collect the anionic dye printing and dyeing wastewater of printing and dyeing mill, detect wherein contained main coloring matter composition and volumetric molar concentration, COD value, colourity and pH value with known method;
Second step, the anionic dye printing and dyeing wastewater pre-treatment
The pH value of regulating the described anionic dye printing and dyeing wastewater of the first step with hydrochloric acid is 4.0～7.0, and it is divided into four batches;
The 3rd step, foam separation circulation decolorization
The 1st decolouring, in pretreated first batch of anionic dye printing and dyeing wastewater of second step, add the cats product cetyl trimethylammonium bromide, hereinafter referred to as CTAB, in the CTAB that adds and the anionic dye printing and dyeing wastewater mol ratio of contained coloring matter be 1.5～2.69: 1, carry out the 1st decolouring with bubble tower, temperature is 15～45 ℃, and the gas volume flow velocity is 0.02～0.05m
3/ hour, foam layer height is 0.6～0.8m, with broken foam method foam layer is broken foam, the one-period operating time is 15～20 minutes, anionic dye printing and dyeing wastewater colourity decreasing ratio is greater than 97%, the COD decreasing ratio is greater than 88%, anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, foam layer obtains brokenly foam liquid through broken foam, filters and should break foam liquid, and the gained solid is the thick product of dyestuff, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 2nd decolouring;
The 2nd decolouring, the filtrate of the 1st decolouring gained is joined the new anionic dye printing and dyeing wastewater of formation in pretreated second batch of anionic dye printing and dyeing wastewater of second step, add the partial cation Surfactant CTAB again, the mol ratio of the contained coloring matter of anionic dye printing and dyeing wastewater of the CTAB that adds and second batch is 0.8～1.2: 1, carry out the 2nd decolouring with bubble tower, temperature, the gas volume flow velocity, foam layer height and cycleoperation time are all identical with the 1st decolouring, anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of dyestuff, to be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 3rd decolouring;
The 3rd decolouring, the filtrate of the 2nd decolouring gained is joined in pretreated the 3rd batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 3rd decolouring, the anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of dyestuff, will be applied in the dyeing process once more, and the filtrate of collecting will be carried out the 4th decolouring;
The 4th decolouring, the filtrate of the 3rd decolouring gained is joined in pretreated the 4th batch of anionic dye printing and dyeing wastewater of second step, adopt method and processing parameter identical when the 2nd time decolours, carry out the 4th decolouring, this anionic dye printing and dyeing wastewater colourity decreasing ratio still is not less than 97.0%, the COD decreasing ratio is greater than 85%, anionic dye printing and dyeing wastewater after the processing reaches the GB4287-92 requirement, directly discharging, the broken foam liquid that obtains is filtered, the gained solid is the thick product of dyestuff, will be applied to once more in the dyeing process, the filtrate of collecting is carried out next step evaporative crystallization handle;
The 4th step, evaporative crystallization
The filtrate of the 4th decolouring back collection is carried out evaporative crystallization to the 3rd step, and the crystallization precipitate of collecting is the thick product of dyestuff, and this thick product will be applied in the dyeing process once more.
2. according to the treatment process of the described anionic dye printing and dyeing wastewater of claim 1, it is characterized in that: described broken foam method is mechanical process, hot froth breaking method or electric field method.
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| CN101805034A (en) * | 2010-03-17 | 2010-08-18 | 北京迪威尔石油天然气技术开发有限公司 | Method and device for reducing COD of sewage generated by crude oil deacidification |
| CN102531226A (en) * | 2011-10-20 | 2012-07-04 | 常州亚环环保科技有限公司 | Method for treating acidic dye printing and dyeing wastewater |
| CN103964600B (en) * | 2013-02-05 | 2016-08-17 | 浙江龙盛集团股份有限公司 | A kind of recoverying and utilizing method of azo dispersion dyes waste water |
| CN114702156A (en) * | 2022-03-24 | 2022-07-05 | 河北瑞格纺织有限公司 | Printing and dyeing sewage recycling process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4409908A (en) * | 1978-05-01 | 1983-10-18 | Udyma Petr G | Method for thermal decontamination of waste waters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4409908A (en) * | 1978-05-01 | 1983-10-18 | Udyma Petr G | Method for thermal decontamination of waste waters |
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