CN111847764A - Method for treating printing and dyeing wastewater based on catalytic oxidation of ozone - Google Patents
Method for treating printing and dyeing wastewater based on catalytic oxidation of ozone Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 82
- 238000004043 dyeing Methods 0.000 title claims abstract description 56
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 27
- 230000003647 oxidation Effects 0.000 title claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 25
- 238000011282 treatment Methods 0.000 claims abstract description 85
- 238000004062 sedimentation Methods 0.000 claims abstract description 37
- 239000010802 sludge Substances 0.000 claims abstract description 27
- 238000001556 precipitation Methods 0.000 claims abstract description 24
- 230000020477 pH reduction Effects 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000005273 aeration Methods 0.000 claims abstract description 5
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 4
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 3
- 238000006385 ozonation reaction Methods 0.000 claims description 12
- 239000006228 supernatant Substances 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 7
- 238000006460 hydrolysis reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 6
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 6
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 10
- 231100000719 pollutant Toxicity 0.000 abstract description 10
- 239000000701 coagulant Substances 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 238000003911 water pollution Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000000126 substance Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000003610 charcoal Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 208000034699 Vitreous floaters Diseases 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
Abstract
The invention discloses a method for treating printing and dyeing wastewater based on catalytic oxidation of ozone, and belongs to the technical field of water pollution treatment. The method comprises the following steps: primarily filtering the printing and dyeing wastewater through a grid; a step of hydrolytic acidification in a regulating reservoir; a primary sedimentation step after the treatment of a first coagulating agent in a primary sedimentation tank; a step of treating the catenary aeration activated sludge and powdered activated carbon in a biological tank; a secondary sedimentation step in a secondary sedimentation tank; a third precipitation step after the treatment of a second coagulating agent in a third precipitation tank; the ozone catalytic oxidation treatment step and the discharge step in the ozone treatment pool. When the invention is applied to the treatment of printing and dyeing wastewater, the advanced treatment can be carried out on the wastewater discharged by printing and dyeing enterprises, the treatment capacity in the biological treatment stage is improved, the pollutant content in the wastewater and the chromaticity of the wastewater are reduced, and the effluent quality of the printing and dyeing wastewater treatment is improved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating printing and dyeing wastewater based on catalytic oxidation of ozone.
Background
The printing and dyeing wastewater is wastewater discharged from a printing and dyeing mill mainly processing cotton, hemp, chemical fibers and blended products thereof. The printing and dyeing wastewater has high pollutant content, poor biodegradability, large chromaticity and violent water quality change, and the pollutants also contain toxic substances consisting of benzene, nitrogen, amine and other groups. At present, some enterprises in the dyeing industry park basically perform simple primary treatment on the dyeing wastewater and then discharge the dyeing wastewater to a sewage treatment plant for continuous treatment. Therefore, wastewater received by a sewage treatment plant contains substances which are difficult to treat by a common method, such as dyes, surfactants, various high molecular compounds and the like, the biodegradability of the wastewater is worse, and the wastewater is difficult to treat by a single conventional process. Therefore, it is necessary to develop a combination of various treatment processes for treatment.
Disclosure of Invention
The invention provides a method for treating printing and dyeing wastewater based on ozone catalytic oxidation, which is used for deeply treating wastewater discharged by printing and dyeing enterprises and reducing the content of pollutants in the wastewater and the chromaticity of the wastewater.
In order to achieve the above object, the present invention provides a technical solution: a method for treating printing and dyeing wastewater based on ozone catalytic oxidation is characterized by comprising the following steps: a primary filtering step, primarily filtering the printing and dyeing wastewater by a grid; a step of hydrolysis acidification, which is to introduce the primarily filtered printing and dyeing wastewater into an adjusting tank and carry out hydrolysis and acidification in the adjusting tank; a primary precipitation step, namely introducing the printing and dyeing wastewater subjected to hydrolytic acidification into a primary precipitation tank, adding a first coagulation agent into the wastewater in the primary precipitation tank, and introducing the precipitate in the primary precipitation tank into sludge treatment equipment for treatment; a biological treatment step, namely introducing the supernatant of the primary sedimentation tank into a biological tank, adding powdered biochar into the biological tank, and treating the printing and dyeing wastewater by adopting a catenary aeration activated sludge process; a secondary sedimentation step, introducing the printing and dyeing wastewater flow after biological treatment into a secondary sedimentation tank for secondary sedimentation, introducing one part of sediment in the secondary sedimentation tank into sludge treatment equipment for treatment, and refluxing the other part of sediment to the biological tank; a third sedimentation step, namely introducing the supernatant of the secondary sedimentation tank into a tertiary sedimentation tank, simultaneously adding a second coagulation agent into the tertiary sedimentation tank, and introducing the sediment of the tertiary sedimentation tank into sludge treatment equipment for treatment; an ozone catalytic oxidation treatment step, namely introducing the supernatant of the three-precipitation tank into an ozone treatment tank, and placing an ozone oxidation catalyst in the ozone treatment tank; and a discharging step, namely introducing the printing and dyeing wastewater subjected to ozone catalytic oxidation treatment into a drainage system.
The invention has the beneficial effects that: by the method for treating the printing and dyeing wastewater based on ozone catalytic oxidation, the wastewater discharged by printing and dyeing enterprises is subjected to advanced treatment, the treatment efficiency in a biological treatment stage is improved, and the pollutant content in the printing and dyeing wastewater and the chromaticity of the wastewater are reduced.
Drawings
FIG. 1 is a flow chart of a method for treating printing and dyeing wastewater based on ozone catalytic oxidation.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
It is to be understood that the terms "first" and "second" in the abstract, the claims and the specification of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
FIG. 1 shows an embodiment of the present invention, and in the method for treating printing and dyeing wastewater based on catalytic ozonation, the treatment process of the printing and dyeing wastewater comprises the following steps:
and a primary filtering step, namely primarily filtering the collected printing and dyeing wastewater by using a grid to remove larger floaters and insoluble substances in the wastewater.
And a hydrolysis acidification step, namely introducing the waste water subjected to the primary filtration of the grating into an adjusting tank, buffering water quality and water quantity in the adjusting tank, and simultaneously performing hydrolysis acidification so as to decompose macromolecular organic matters into micromolecular organic matters and change insoluble organic matters into soluble substances.
And a primary precipitation step, wherein the wastewater after hydrolytic acidification treatment is introduced into a primary precipitation tank from a regulating tank, a first coagulant, such as coagulant polyferric sulfate and flocculant polyacrylamide, is added into the wastewater, and after the first coagulant reacts with the wastewater, pollutants are coagulated and precipitated to form sludge at the bottom of the primary precipitation tank, the sludge is discharged into a sludge treatment system, and after the sludge is treated by sludge treatment equipment (such as a plate-and-frame filter press), a filter cake enters a subsequent treatment process.
And a biological treatment step, namely introducing the supernatant of the primary sedimentation tank into a biological tank, treating the printing and dyeing wastewater by adopting a catenary aeration activated sludge process, and adding efficient powdered biochar into the biological tank to enhance the biological treatment effect. The adding amount of the biochar is adjusted according to the water quality of inlet water of a specific biological pool, the treatment cost of wastewater is saved while the treatment effect is ensured, and preferably, the concentration of the powdered biochar is controlled to be 50-100 mg/L. The biochar mainly adsorbs organic matters in the wastewater, so that the degradation effect of microorganisms in the activated sludge on the organic matters is improved. Moreover, the biological carbon can also adsorb some biological toxic substances so as to reduce the impact on a biological system, and meanwhile, the biological carbon can also adsorb color development substances so as to reduce the chroma in the printing and dyeing wastewater. The addition of the biochar improves the treatment capacity of the printing and dyeing wastewater in the biological treatment stage.
And a secondary precipitation step, wherein the wastewater treated by the biological tank is introduced into a secondary precipitation tank for secondary precipitation, and most of organic matters, nitrogen, phosphorus and other pollutants are removed. And (3) discharging a part of the precipitated sludge at the bottom of the secondary sedimentation tank into a sludge treatment system, treating the part of the precipitated sludge by sludge treatment equipment (such as a plate-and-frame filter press), and then, allowing the filter cake to enter a subsequent treatment process. And the other part of sludge flows back to the biological pond to ensure the concentration of active microorganisms in the biological pond.
And a third precipitation step, namely introducing the supernatant of the secondary precipitation tank into a tertiary precipitation tank, and simultaneously adding a second coagulant into the tertiary precipitation tank, such as coagulant polymeric ferric aluminum sulfate and flocculant polyacrylamide. Preferably, the adding mass concentration of the polymeric aluminum ferric sulfate is 100-300 mg/L, and the adding mass concentration of the polyacrylamide is 0.5-3.0 mg/L. And (3) discharging precipitated sludge generated after the printing and dyeing wastewater is treated by the second coagulating agent into a sludge treatment system, treating by sludge treatment equipment (such as a plate-and-frame filter press), and then, allowing a filter cake to enter a subsequent treatment process.
And (3) an ozone catalytic oxidation treatment step, namely introducing the supernatant of the three-precipitation tank into an ozone treatment tank in which an ozone oxidation catalyst is placed, preferably selecting the ozone oxidation catalyst with a silicon-aluminum substrate and a transition metal oxide as active ingredients, so that the oxidation treatment effect of ozone on organic pollutants in the printing and dyeing wastewater is enhanced, and the chromaticity of the wastewater is further reduced. In one embodiment of the invention, the adding concentration of ozone in the ozone treatment tank is 10-40 mg/L, and the retention time of the treated wastewater in the ozone treatment unit is 10-60 min.
And a discharging step, namely introducing the printing and dyeing wastewater subjected to ozone catalytic oxidation treatment into a drainage system.
The method for treating printing and dyeing wastewater according to the present invention will be further described with reference to a specific example.
The primarily treated printing and dyeing wastewater is collected in a sewage plant, and floating substances and larger insoluble substances in the wastewater are removed through a grating. Then the waste water after passing through the grating is introduced into a regulating reservoir, the regulating reservoir is utilized to buffer water quality and water quantity, meanwhile, hydrolysis and acidification are carried out, macromolecular organic matters are decomposed into micromolecular organic matters, insoluble organic matters are changed into soluble substances, and conditions are provided for subsequent biological treatment.
And adding polymeric ferric sulfate and polyacrylamide into the outlet water of the regulating tank, wherein the adding amount is 0.1-0.3L (the total iron mass fraction is more than 11%) and 0.5-3.0 g respectively for each ton of water, and feeding the water into a primary sedimentation tank for primary sedimentation to remove most of particles.
And (3) enabling the water flowing out of the primary sedimentation tank to enter a biological treatment tank, adding efficient powdered biochar into the biological treatment tank to enhance the biological treatment effect, and treating the wastewater by adopting a catenary aeration activated sludge process. The adding mode of the high-efficiency charcoal powder is as follows: and in the starting stage of the first three days, adding the charcoal powder according to the amount of one ten-thousandth to five ten-thousandth of the effective tank volume, adding the charcoal powder once every day, gradually decreasing the adding amount of the high-efficiency charcoal powder, and entering a stable adding stage in the fourth day, wherein the adding concentration is 50-100 mg/L, and the specific adding concentration is adjusted along with the water quality of inlet and outlet water.
The wastewater treated by the biological treatment tank enters a secondary sedimentation tank for secondary sedimentation, and most of organic matters, nitrogen, phosphorus and other pollutants are removed.
And introducing the supernatant effluent of the secondary sedimentation tank into a tertiary sedimentation tank, simultaneously adding 150-300 mg/L polymeric aluminum ferric sulfate into the tertiary sedimentation tank, fully stirring and mixing, adding polyacrylamide according to the standard of 0.5-3.0 mg/L mass concentration, stirring and mixing, performing third precipitation, and further removing pollutants such as colloid difficult to settle.
The supernatant of the three-precipitation tank is introduced into an ozone treatment tank, the ozone treatment tank contains an ozone catalytic oxidation catalyst, COD removal by ozone is 2-3 times of that by direct oxidation of ozone, and the ozone oxidation efficiency is greatly improved. Adding ozone into the ozone treatment tank according to the concentration of 15mg/L, wherein the retention time of the wastewater in the ozone treatment tank is 30 min. Thereby removing the chroma of the wastewater and further oxidizing and removing organic matters, and the residual ozone in the effluent continuously keeps a certain sterilization effect. After ozone treatment, the effluent is discharged.
Table 1: water quality of each treatment stage in examples
Note: indicating that data is not being used due to large errors
Table 1 shows the quality of the effluent from each treatment stage of the printing and dyeing wastewater in the examples of the present invention. COD in the final effluent CrThe removal rate of the catalyst reaches 95 percent, the removal rate of TN reaches 36 percent, and NH is added3The removal rate of-N reaches 95%, the removal rate of TP reaches 96%, and the removal rate of chroma reaches 92%.
When the invention is applied to the treatment of printing and dyeing wastewater, the advanced treatment can be carried out on the wastewater discharged by printing and dyeing enterprises, the treatment capacity in the biological treatment stage is improved, the pollutant content in the wastewater and the chromaticity of the wastewater are reduced, and the effluent quality of the printing and dyeing wastewater treatment is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for treating printing and dyeing wastewater based on ozone catalytic oxidation is characterized by comprising the following steps:
a primary filtering step, primarily filtering the printing and dyeing wastewater by a grid;
a step of hydrolysis acidification, which is to introduce the primarily filtered printing and dyeing wastewater into an adjusting tank and carry out hydrolysis and acidification in the adjusting tank;
a primary precipitation step, namely introducing the printing and dyeing wastewater subjected to hydrolytic acidification into a primary precipitation tank, adding a first coagulation agent into the wastewater in the primary precipitation tank, and introducing the precipitate in the primary precipitation tank into sludge treatment equipment for treatment;
A biological treatment step, namely introducing the supernatant of the primary sedimentation tank into a biological tank, adding powdered biochar into the biological tank, and treating the printing and dyeing wastewater by adopting a catenary aeration activated sludge method;
a secondary sedimentation step, wherein the printing and dyeing wastewater after biological treatment is introduced into a secondary sedimentation tank for secondary sedimentation, one part of the sedimentation sludge in the secondary sedimentation tank is introduced into the sludge treatment equipment for treatment, and the other part of the sedimentation sludge flows back to the biological tank;
a third sedimentation step, namely introducing the supernatant of a secondary sedimentation tank into a tertiary sedimentation tank, simultaneously adding a second coagulation agent into the tertiary sedimentation tank, and introducing the sediment of the tertiary sedimentation tank into the sludge treatment equipment for treatment;
the method comprises the following steps of (1) carrying out catalytic ozonation treatment, namely introducing supernate of a tertiary sedimentation tank into an ozonation treatment tank, and placing an ozonation catalyst in the ozonation treatment tank;
and a discharging step, namely introducing the printing and dyeing wastewater subjected to ozone catalytic oxidation treatment into a drainage system.
2. The method for treating printing and dyeing wastewater based on catalytic ozonation of claim 1, wherein the first coagulation agent is polymeric ferric sulfate and polyacrylamide.
3. The method for treating printing and dyeing wastewater based on ozone catalytic oxidation as claimed in claim 1, wherein the adding manner of the powdered biochar is as follows: and the first three days of the starting stage of the wastewater treatment process are added according to one ten thousandth to five ten thousandth of the effective tank volume, the adding amount is gradually reduced, and the fourth day enters a stable adding stage.
4. The method for treating printing and dyeing wastewater based on ozone catalytic oxidation according to claim 1, wherein the concentration of the powdered biochar added in the biological treatment step is 50-100 mg/L.
5. The method for treating printing and dyeing wastewater based on catalytic ozonation of claim 1, wherein the second coagulation agent is polymeric aluminum ferric sulfate and polyacrylamide.
6. The method for treating printing and dyeing wastewater based on ozone catalytic oxidation according to claim 5, wherein the adding mass concentration of the polymeric aluminum ferric sulfate is 100-300 mg/L, and the adding mass concentration of the polyacrylamide is 0.5-3.0 mg/L.
7. The method for treating printing and dyeing wastewater based on catalytic ozonation according to claim 1, wherein the catalytic ozonation treatment step comprises adding an ozonation catalyst comprising a silicon-aluminum substrate and a transition metal oxide as active ingredients.
8. The method for treating printing and dyeing wastewater based on catalytic ozonation according to claim 1, wherein the ozone adding concentration in the catalytic ozonation treatment step is 10-40 mg/L, and the retention time of the treated wastewater in the ozone treatment unit is 10-60 min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624534A (en) * | 2021-01-29 | 2021-04-09 | 浙江金大万翔环保技术有限公司 | Method for treating printing and dyeing wastewater based on ozone advanced oxidation technology |
| CN113860659A (en) * | 2021-11-01 | 2021-12-31 | 北京恩菲环保股份有限公司 | Treatment method of industrial wastewater difficult to degrade |
| CN116514337A (en) * | 2023-05-30 | 2023-08-01 | 东润(山东)环境工程有限公司 | Pretreatment oxidation process special for treating antioxidant production wastewater |
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| CN101525202A (en) * | 2009-04-14 | 2009-09-09 | 东华大学 | Advanced dyeing wastewater treatment and reclaimed water reuse system and method thereof |
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| CN116514337A (en) * | 2023-05-30 | 2023-08-01 | 东润(山东)环境工程有限公司 | Pretreatment oxidation process special for treating antioxidant production wastewater |
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