Treatment process of acid-containing wastewater

A technology for treating process and wastewater, applied in the treatment field of acid-containing wastewater from bromo-acid, can solve the problems of high cost, extremely high equipment requirements and high risk, and achieve the effects of mild conditions, reduced production cost and simple process.

Active Publication Date: 2016-08-17
ZHEJIANG QICAI ECO TECH CO LTD
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  • Description
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Problems solved by technology

[0008] The Chinese patent document with the publication number CN 103373711A discloses a method of high-temperature concentration and adding nitric acid or potassium permanganate to oxidize and decompose organic matter, and finally obtain 96% concentrated sulfuric acid. However, this method requires a high temperature of 310°C and requires extremely high equipment High, high cost, high risk

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  • Treatment process of acid-containing wastewater

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Experimental program
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Effect test

Embodiment 1

[0039] The acid-containing wastewater produced by the production of bromic acid has a sulfuric acid content of 15%, COD=6000mg / L, and ammonia nitrogen 29mg / L.

[0040] (1) Activated carbon adsorption: add 0.2% activated carbon by mass volume fraction to bromic acid-containing wastewater, stir at 55° C. for 1 hour, and filter to obtain a red filtrate. After testing, the o-dichlorobenzene content in the filtrate was 0.01%wt, COD=4500mg / L, ammonia nitrogen was 27mg / L, and the bromide ion concentration was 500ppm.

[0041] (2) Acidic resin adsorption: the filtrate after activated carbon adsorption is adsorbed by acidic resin, and the water outlet speed is 3 times of the resin volume per hour. After testing, the adsorption outlet water shows that COD=30mg / L, ammonia nitrogen is not detected, and the bromide ion concentration is 500ppm.

[0042] (3) Chelating resin adsorption: after the acidic resin is adsorbed, the waste acid water is adsorbed by the chelating resin, and the water ...

Embodiment 2

[0049] The acid-containing wastewater produced by the production of bromic acid has a sulfuric acid content of 10%, COD=6050mg / L, and ammonia nitrogen 27mg / L.

[0050] (1) Activated carbon adsorption: add 0.4% mass volume activated carbon to the acid-containing waste water of bromic acid, stir at 40° C. for 1.5 h, and filter to obtain a red filtrate. After testing, the o-dichlorobenzene content in the filtrate was 0.013%wt, COD=4230mg / L, ammonia nitrogen was 24mg / L, and the bromide ion concentration was 480ppm.

[0051] (2) Acidic resin adsorption: the filtrate after activated carbon adsorption is adsorbed by acidic resin, and the water outlet speed is 2.5 times of the resin volume per hour, and the adsorption water is detected, COD=25mg / L, ammonia nitrogen is not detected, and the bromide ion concentration is 480ppm.

[0052] (3) Chelating resin adsorption: After the acidic resin is adsorbed, the waste acid water is adsorbed by the chelating resin, and the water outlet speed ...

Embodiment 3

[0055] The acid-containing wastewater produced by the production of bromic acid has a sulfuric acid content of 20%, COD=6130mg / L, and ammonia nitrogen 33mg / L.

[0056] (1) Activated carbon adsorption: add 0.2% mass volume activated carbon to the acid-containing wastewater of bromic acid, stir at 70° C. for 0.5 h, and filter to obtain a red filtrate. After testing, the o-dichlorobenzene content in the filtrate was 0.01%wt, COD=4800mg / L, ammonia nitrogen was 31mg / L, and the bromide ion concentration was 510ppm.

[0057] (2) Acidic resin adsorption: the filtrate after activated carbon adsorption is adsorbed by acidic resin, and the water outlet speed is 2 times of the resin volume per hour, and the adsorption water is detected, COD=40mg / L, ammonia nitrogen is not detected, and the bromide ion concentration is 510ppm.

[0058] (3) Chelating resin adsorption: After the acidic resin is adsorbed, the waste acid water is adsorbed by the chelating resin, and the water outlet speed is 4...

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Abstract

The invention discloses a treatment process of acid-containing wastewater. Organic matter and bromine in wastewater are removed through two steps of resin adsorption, and clean concentrated sulfuric acid with concentration of about 50% and condensate water basically containing no impurities are obtained after obtained output water is distilled through a film. The process is simple in procedure, mild in reaction condition, easy to operate, remarkable in effect and good in economic benefit.

Description

technical field [0001] The invention relates to the technical field of industrial waste water, in particular to a treatment method for bromic acid-containing waste water. Background technique [0002] Bromic acid is an important dye intermediate, used in the manufacture of acidic anthraquinone dyes in industrial production, such as weakly acidic brilliant blue GAW; weakly acidic brilliant blue R; reactive brilliant blue M-BR; brilliant blue KN-R ; Brilliant blue K3R; Brilliant blue KGR and so on. At present, there are two domestic processes for synthesizing bromonic acid, the solvent method and the oleum method, both of which are prepared from 1-aminoanthraquinone through sulfonation-acid extraction-bromination-neutralization-isolation. Regardless of the solvent method or the fuming sulfuric acid method, a large amount of waste water is generated during the neutralization process of the acidic filter cake of bromic acid. Among them, the wastewater produced has the characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/281C02F1/283C02F1/447C02F9/00
Inventor 陈磊王慧吕伏建
Owner ZHEJIANG QICAI ECO TECH CO LTD
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