CN111268827A - Method for treating COD in dye intermediate wastewater - Google Patents
Method for treating COD in dye intermediate wastewater Download PDFInfo
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- CN111268827A CN111268827A CN202010177831.1A CN202010177831A CN111268827A CN 111268827 A CN111268827 A CN 111268827A CN 202010177831 A CN202010177831 A CN 202010177831A CN 111268827 A CN111268827 A CN 111268827A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
Abstract
According to the method for treating COD in the dye intermediate wastewater, dilute sulfuric acid is added to adjust the pH value of the wastewater to 2-4; pumping the regulated DOCT into an advanced oxidation reaction tank, and reacting under continuous stirring; discharging the mixture into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution, adjusting the pH value of the treated water to 10.5-11.5, performing alkali precipitation reaction, discharging the mixture into a polyacrylamide flocculation tank after the reaction is finished, adding a polyacrylamide solution, and uniformly mixing the mixture under slow stirring; after being mixed, the mixture is discharged into a sedimentation tank, is kept stand and sedimentated, and enters a security filter; the supernatant enters a CAFE combination, the produced water can be directly discharged, and the CAFE combination is to firstly carry out mixed catalytic oxidation by using an advanced oxidation technical reagent ISO-10 and CA and then carry out KC catalytic adsorption; the COD of the discharged wastewater is less than or equal to 100 mg/L. The invention not only improves the efficiency of advanced oxidation technology for treating wastewater, but also reduces the cost.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a method for treating COD (chemical oxygen demand) in dye intermediate wastewater.
Background
China is the biggest dye producing country all over the world at present, and with the rapid development of the dye industry, the environmental problems are increasingly prominent. The three wastes generated in the preparation of the dye intermediate, in particular the waste water, are the main sources of the pollution of the dye industry in China. The dye intermediate wastewater refers to process wastewater discharged in the production process of the dye or the dye intermediate. The waste water contains acid, alkali, salt, halogen, hydrocarbon, nitro compound, amine, dye, intermediate and other substances, and some of the waste water also contains virulent benzidine, pyridine, ammonia, phenol, heavy metals of mercury, cadmium, chromium and the like. And the organic matter concentration is high, its CODCrThe value is generally inMore than 4000mg/L, for acid dyes, direct dyes and edible dyes, as the raw materials often have sulfonic acid groups and are easily soluble in water, the organic pollutants mostly exist in the waste liquid in a water-soluble state, and the discharge requirement (GB4287-2012) is difficult to achieve by the traditional method treatment.
Disclosure of Invention
The invention aims to provide a method for treating COD in dye intermediate wastewater.
The invention realizes the purpose through the following technical scheme: a method for treating COD in dye intermediate wastewater comprises the following steps:
s1, adding dilute sulfuric acid to adjust the pH value of the wastewater to 2-4; mixing an oxidant and a reaction catalyst according to a mass ratio of 1: 3 preparing a DOCT aqueous solution, pumping the regulated DOCT into a high-grade oxidation reaction tank, and reacting for 0.5-1.5h under continuous stirring, wherein the Chemical Oxygen Demand (COD) of the input wastewater is more than 4000 mg/L.
S2, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution, adjusting the pH value of the treated water to 10.5-11.5, and carrying out an alkali precipitation reaction for 1.5 h;
s3, discharging the mixture into a polyacrylamide flocculation tank after the reaction is finished, adding a polyacrylamide solution, and uniformly mixing the mixture for 1 hour under slow stirring;
s4, after mixing, discharging into a sedimentation tank, standing for sedimentation for 1-3h, and feeding into a security filter;
s5, enabling the supernatant to enter a CAFE combination, directly discharging produced water, wherein the CAFE combination is to firstly perform mixed catalytic oxidation by using an advanced oxidation technical reagent ISO-10 and CA, and then perform KC catalytic adsorption; the chemical oxygen demand COD of the discharged wastewater is less than or equal to 100 mg/L.
Further, the stirring reaction rate in S2 was 120 r/min.
Furthermore, the concentration of the S3 polyacrylamide PAM solution is 0.1%, and the adding amount is 5-6 mL/L.
Further, the concentration of the sodium hydroxide solution in the S2 is 6%.
Further, the slow stirring rate in S3 is 60 r/min.
Compared with the prior art, the method for treating COD in the dye intermediate wastewater has the beneficial effects that: through treating waste water in grades, and when the waste water with a low COD value is treated by adopting the advanced oxidation technology, the carrier containing the advanced oxidation agent is added, and the carrier is CA and KC, so that the time for treating the waste water and the using amount of the catalyst for treating the waste water are both reduced, the efficiency of treating the waste water by adopting the advanced oxidation technology is improved, and the cost is reduced.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
A method for treating COD in dye intermediate wastewater comprises the following steps:
s1, adding dilute sulfuric acid to adjust the pH value of the wastewater to 2-4; oxidizing agent (DO) and reaction Catalyst (CT) are mixed according to the mass ratio of 1: 3 preparing a DOCT aqueous solution, pumping the regulated DOCT into an advanced oxidation reaction tank, continuously stirring and reacting for 0.5-1.5h to generate enough hydroxyl free radicals, oxygen radicals and DO free radicals, and destroying chromophoric groups or dye molecular structures; the rate of stirring the reaction was 120 r/min. The chemical oxygen demand COD of the input wastewater is more than 4000 mg/L.
S2, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the concentration of 6%, adjusting the pH value of the treated water to 10.5-11.5, and carrying out an alkali precipitation reaction for 1.5 h;
s3, discharging the mixture into a Polyacrylamide (PAM) flocculation tank after the reaction is finished, adding a PAM solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring; the concentration of the polyacrylamide PAM solution is 0.1 percent, and the adding amount is 5-6 mL/L. The slow stirring rate was 60 r/min.
S4, after mixing, discharging into a sedimentation tank, standing for sedimentation for 1-3h, and feeding into a security filter; the chemical oxygen demand COD of the discharged wastewater is more than or equal to 1000mg/L and less than or equal to 2000 mg/L;
s5, introducing the supernatant
(C-Catalysis, A-Adsorption, F-Feltration filtration and E-Exchange) and the produced water can be directly discharged. CAFE combination as high-priorityAnd (3) carrying out mixed catalytic oxidation on a grade oxidation technical reagent ISO-10 and CA, and then carrying out KC catalytic adsorption. COD of the discharged wastewater is less than or equal to 100 mg/L. CA is nano-scale catalytic boiling stone, and has a high filtration speed: 4.3GMP/ft3, which itself has catalytic action both inside and outside, and does not contain crystalline silicon. KC is nano-scale catalytic active carbon with the particle size of 2000-2500m2The super-large surface area of the catalyst per gram is large, the catalyst has strong adsorption capacity, the inside and the outside of the catalyst per se have catalytic action, after adsorption saturation, the function recovery can be promoted through strong oxidation, and waste liquid generated in the function recovery process is almost completely oxidized through strong oxidation.
Example 1
A method for treating COD in dye intermediate wastewater comprises the following steps:
s1, adding dilute sulfuric acid to adjust the pH value of the wastewater to 2; oxidizing agent (DO) and reaction Catalyst (CT) are mixed according to the mass ratio of 1: 3 preparing a DOCT aqueous solution, pumping the regulated DOCT into an advanced oxidation reaction tank, continuously stirring and reacting for 0.5h to generate enough hydroxyl free radicals, oxy radicals and DO free radicals, and destroying a chromophoric group or a dye molecular structure; the rate of stirring the reaction was 120 r/min. The chemical oxygen demand COD of the input wastewater is more than 4000 mg/L.
S2, discharging the mixture into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the concentration of 6%, adjusting the pH value of the treated water to 10.5, and carrying out an alkali precipitation reaction for 1.5 h;
s3, discharging the mixture into a Polyacrylamide (PAM) flocculation tank after the reaction is finished, adding a PAM solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring; the concentration of the polyacrylamide PAM solution is 0.1 percent, and the adding amount is 5 mL/L. The slow stirring rate was 60 r/min.
S4, after mixing, discharging into a sedimentation tank, standing for sedimentation for 1h, and feeding into a security filter;
and S5, enabling the supernatant to enter a CAFE combination, and directly discharging produced water. The CAFE combination is that firstly, an advanced oxidation technical reagent ISO-10 and CA are mixed for catalytic oxidation, and then KC catalytic adsorption is carried out. The chemical oxygen demand COD of the discharged wastewater is less than or equal to 100 mg/L.
Example 2
A method for treating COD in dye intermediate wastewater comprises the following steps:
s1, adding dilute sulfuric acid to adjust the pH value of the wastewater to 3; oxidizing agent (DO) and reaction Catalyst (CT) are mixed according to the mass ratio of 1: 3 preparing a DOCT aqueous solution, pumping the regulated DOCT into an advanced oxidation reaction tank, continuously stirring and reacting for 1 hour to generate enough hydroxyl free radicals, oxygen radicals and DO free radicals, and destroying a chromophoric group or a dye molecular structure; the rate of stirring the reaction was 120 r/min. The chemical oxygen demand COD of the input wastewater is more than 4000 mg/L.
S2, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the concentration of 6%, adjusting the pH value of the treated water to 11, and carrying out an alkali precipitation reaction for 1.5 h;
s3, discharging the mixture into a Polyacrylamide (PAM) flocculation tank after the reaction is finished, adding a PAM solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring; the concentration of the polyacrylamide PAM solution is 0.1 percent, and the adding amount is 5.5 mL/L. The slow stirring rate was 60 r/min.
S4, after mixing, discharging into a sedimentation tank, standing for 2h for sedimentation, and feeding into a security filter;
and S5, enabling the supernatant to enter a CAFE combination, and directly discharging produced water. The CAFE combination is that firstly, an advanced oxidation technical reagent ISO-10 and CA are mixed for catalytic oxidation, and then KC catalytic adsorption is carried out. The chemical oxygen demand COD of the discharged wastewater is less than or equal to 100 mg/L.
Example 3
A method for treating COD in dye intermediate wastewater comprises the following steps:
s1, adding dilute sulfuric acid to adjust the pH value of the wastewater to 4; oxidizing agent (DO) and reaction Catalyst (CT) are mixed according to the mass ratio of 1: 3 preparing a DOCT aqueous solution, pumping the regulated DOCT into an advanced oxidation reaction tank, continuously stirring and reacting for 1.5 hours to generate enough hydroxyl free radicals, oxy radicals and DO free radicals, and destroying a chromophoric group or a dye molecular structure; the rate of stirring the reaction was 120 r/min. The chemical oxygen demand COD of the input wastewater is more than 4000 mg/L.
S2, discharging the mixture into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the concentration of 6%, adjusting the pH value of the treated water to 11.5, and carrying out an alkali precipitation reaction for 1.5 h;
s3, discharging the mixture into a Polyacrylamide (PAM) flocculation tank after the reaction is finished, adding a PAM solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring; the concentration of the polyacrylamide PAM solution is 0.1 percent, and the adding amount is 6 mL/L. The slow stirring rate was 60 r/min.
S4, after mixing, discharging into a sedimentation tank, standing for 3 hours for sedimentation, and feeding into a security filter;
and S5, enabling the supernatant to enter a CAFE combination, and directly discharging produced water. The CAFE combination is that firstly, an advanced oxidation technical reagent ISO-10 and CA are mixed for catalytic oxidation, and then KC catalytic adsorption is carried out. COD of the discharged wastewater is less than or equal to 100 mg/L.
The invention treats the waste water by stages, and adds the carrier containing the advanced oxidation medicament when the waste water with low COD value is treated by adopting the advanced oxidation technology, and the carrier is CA and KC, thereby reducing the time for treating the waste water and the dosage of the catalyst used for treating the waste water, improving the efficiency of treating the waste water by the advanced oxidation technology and reducing the cost.
The two characteristics make up the defects of the outdoor fabric fully, the cost has great competitiveness, and the market space is very large. While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The method for treating COD in the dye intermediate wastewater is characterized by comprising the following steps of:
s1, adding dilute sulfuric acid to adjust the pH value of the wastewater to 2-4; mixing an oxidant and a reaction catalyst according to a mass ratio of 1: 3 preparing a DOCT aqueous solution, pumping the regulated DOCT into a high-grade oxidation reaction tank, and reacting for 0.5-1.5h under continuous stirring, wherein the Chemical Oxygen Demand (COD) of the input wastewater is more than 4000 mg/L;
s2, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution, adjusting the pH value of the treated water to 10.5-11.5, and carrying out an alkali precipitation reaction for 1.5 h;
s3, discharging the mixture into a polyacrylamide flocculation tank after the reaction is finished, adding a polyacrylamide solution, and uniformly mixing the mixture for 1 hour under slow stirring;
s4, after mixing, discharging into a sedimentation tank, standing for sedimentation for 1-3h, and feeding into a security filter;
s5, enabling the supernatant to enter a CAFE combination, directly discharging produced water, wherein the CAFE combination is to firstly perform mixed catalytic oxidation by using an advanced oxidation technical reagent ISO-10 and CA, and then perform KC catalytic adsorption; the chemical oxygen demand COD of the discharged wastewater is less than or equal to 100 mg/L.
2. The method for treating COD in dye intermediate wastewater according to claim 1, wherein: the stirring rate in S2 was 120 r/min.
3. The method for treating COD in dye intermediate wastewater according to claim 1, wherein: the concentration of the S3 polyacrylamide PAM solution is 0.1 percent, and the adding amount is 5-6 mL/L.
4. The method for treating COD in dye intermediate wastewater according to claim 1, wherein: the concentration of the sodium hydroxide solution in the S2 is 6%.
5. The method for treating COD in dye intermediate wastewater according to claim 1, wherein: the slow stirring rate in S3 was 60 r/min.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745961A (en) * | 2016-11-25 | 2017-05-31 | 中冶赛迪工程技术股份有限公司 | A kind of method and system of coking wastewater deep treatment decarburization decolouring decyanation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745961A (en) * | 2016-11-25 | 2017-05-31 | 中冶赛迪工程技术股份有限公司 | A kind of method and system of coking wastewater deep treatment decarburization decolouring decyanation |
Non-Patent Citations (1)
| Title |
|---|
| LLBYONGER : "DOCT-intro", 《道客巴巴》 * |
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Application publication date: 20200612 |