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Method for removing bromine from disperse dye wastewater

A technology for disperse dyes and wastewater, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of no treatment plan, etc., and achieve the effects of small solid waste output, corrosion avoidance, and safe operation

Inactive Publication Date: 2015-05-06
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no simple and effective treatment plan for disperse dye wastewater containing high bromine, high acid content and high COD

Method used

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  • Method for removing bromine from disperse dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The color of disperse red 60 hydrolysis mother liquor wastewater is reddish black, containing bromide ion=3089mg / L, sulfuric acid about 35%, COD=12025mg / L.

[0039] Adjust wastewater pH=4 with liquid ammonia; add 0.5% FeSO 4 ·7H 2 O and 1.0% hydrogen peroxide (based on the mass of the disperse red 60 hydrolyzed mother liquor wastewater), the temperature is controlled between 40-50°C, and the reaction is stirred for 1 hour; after the reaction, add 0.26% PAM (polyacrylamide) solution to the wastewater , and then adjust the pH to 8 with ammonia water, first stir quickly for 0.5 min, then slowly stir for 20 min, and filter. Then add 0.2% activated carbon, stir for 0.5h, and filter. The filtrate is colorless and transparent, COD in the filtrate=5982mg / L, Br - = 8mg / L. The filtrate was adjusted to pH 5.5 with concentrated sulfuric acid and concentrated under reduced pressure. Concentrated 1.7 times, COD in the concentrate=9705mg / L, COD in the condensate=1053.4mg / L, NH 3...

Embodiment 2

[0060] The color of the disperse red 3B hydrolysis mother liquor wastewater is dark purple, containing bromide ions=2480mg / L, sulfuric acid about 41%, COD=16025mg / L. Add ammonia water (mass concentration: 25-28%) to the wastewater, and adjust the pH of the wastewater to about 2; add 0.3% activated carbon, 2% iron powder, and 0.2% copper to the neutralized wastewater, and stir at room temperature for reaction 4h; add 0.8% hydrogen peroxide to the wastewater after micro-electrolysis, control the temperature between 40-50°C, and stir for 1h; add 0.11% PAM solution to the wastewater after Fenton oxidation, and then use ammonia water (mass concentration of 28%) to adjust pH=9, stir and flocculate for 0.3h and then filter. The filtrate was light yellow, and 0.2% activated carbon was added for adsorption for 0.5h, and then suction filtered. The filtrate is colorless and transparent, the filtrate COD=5868mg / L, Br - =34mg / L; the wastewater after flocculation and decolorization was ad...

Embodiment 3

[0069] The hydrolyzed bromination wastewater of Disperse Blue 56 contains bromine 3588mg / L, acid 45%, COD=56433mg / L. Add ammoniacal liquor (mass concentration is 25~28%) in waste water, the pH of waste water is adjusted to about 4; Add iron-carbon reagent and 0.2% copper in the waste water after neutralization, normal temperature stirring reaction 4h; 1.5% hydrogen peroxide was added to the waste water, the temperature was controlled between 40-50° C., and the reaction was stirred for 1 hour. Add 0.25% PAM solution to the wastewater after Fenton oxidation, adjust pH to 9 with ammonia water (mass concentration: 25-28%), slowly stir and flocculate for 0.5 h, and filter. The filtrate was light yellow, and 0.5% activated carbon was added for adsorption for 0.5h, and then suction filtered. The filtrate is colorless and transparent, the filtrate COD=10468mg / L, Br - = 34 mg / L. Finally, pass ozone for 2 hours, COD drops to 1214mg / L, Br-=5mg / L. The wastewater after flocculation and...

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Abstract

The invention discloses a method for removing bromine from disperse dye wastewater. The method comprises the following steps: firstly, adjusting the pH value of the disperse dye wastewater to be 2-5, adding a fenton reagent, and reacting at 40-60 DEG C for 0.5-2 hours; adding a flocculant to the wastewater, adjusting into alkalinity, standing and filtering to obtain filtrate I; adding an absorbent to the filtrate I, standing again and filtering to obtain filtrate II; and concentrating the filtrate II and recovering sulphate. According to the method, organic matters and bromine in the disperse dye wastewater can be effectively removed; the removal rate on high-concentration bromine and chromaticity can be up to over 99%; the removal rate of the organic matters can be up to over 75%; excellent sulphate is recovered; and the method is simple and easy to operate, and high in removal rate.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater, in particular to a bromine removal method for disperse dye wastewater. Background technique [0002] Disperse Red 3B is a very important anthraquinone series dye and one of the three primary colors of E-type disperse dyes. Disperse Red 3B and FB Red (Disperse Red FB) belong to the same species, and the chemical names are both 1-amino-2-phenoxy-4-hydroxyanthraquinone, but the shades are different. They are all produced by 1-aminoanthraquinone through "bromination-hydrolysis-condensation". The patent with application number 201210069746.9 discloses a method for simultaneously producing Disperse Red 3B and Disperse Red 60. The preparation method described in the patent shows that the biggest difference between the preparation of Disperse Red 3B and Disperse Red 60 lies in the treatment method after condensation. [0003] Both Disperse Red 3B and Disperse Red 60 are produced by the br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F9/00C02F1/281C02F1/46176C02F1/5236C02F1/56C02F1/66C02F1/72C02F1/722C02F1/725C02F1/78C02F2101/308C02F2305/026
Inventor 龙江张静陈磊张云保杨莹莹周小龙
Owner ZHEJIANG QICAI ECO TECH CO LTD
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