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Treatment method of bromamine acid wastewater

A technology for bromamic acid and waste water, which is applied in the field of bromine acid neutralization wastewater treatment, can solve the problems of difficult comprehensive treatment of bromine acid dye wastewater, difficult automatic control, etc., and achieves mild conditions, simple process and simple operation. Effect

Active Publication Date: 2017-01-11
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods are difficult to comprehensively treat bromoacidic dye wastewater, and introduce hetero ions, which are difficult to automatically control

Method used

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  • Treatment method of bromamine acid wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the neutralized wastewater produced by the production of bromic acid, sodium sulfate was measured: 5.3% (mass fraction), ammonia nitrogen 43.9 mg / L, COD=4214mg / L, pH=11.33.

[0034] (1) Flocculation: add 0.03%wt aluminum chloride PAC to the bromic acid neutralization wastewater, stir for 0.5h at 25°C, let stand for 1h, filter to obtain the filtrate. The filter cake is red, and the filtrate is light red transparent clear liquid. Filtrate COD=2670 mg / L, sodium sulfate 5.3%wt, ammonia nitrogen 112.7 mg / L.

[0035] (2) Electrocatalytic reduction: pass the filtrate after flocculation filtration into the electrocatalytic reaction cell, pass in oxygen, and use Ti / RuO 2As the anode and the graphite electrode as the cathode, the catalyst was catalyzed for 25 min. Solution COD=2550 mg / L.

[0036] (3) Low-temperature wet oxidation (hereinafter referred to as LCWO): use 1 mol / L sulfuric acid to adjust the pH to 7.3, add dropwise H 2 o 2 Catalytic oxidation at 40°C, effluent...

Embodiment 2

[0044] In the neutralized waste water from the production of bromic acid, sodium sulfate was measured: 5.2% (mass fraction), ammonia nitrogen 42.7 mg / L, COD=1998mg / L, pH=11.88.

[0045] (1) Flocculation: add 0.05% wt of polyferric sulfate PFS to the bromic acid neutralization wastewater, stir at 45°C for 1 hour, let stand for 0.5 hours, and filter to obtain the filtrate. The filter cake is red, and the filtrate is light red transparent clear liquid. Filtrate COD=670 mg / L, sodium sulfate 5.3%wt, ammonia nitrogen 3 mg / L.

[0046] (2) Electrocatalytic reduction: The filtrate after flocculation and filtration was passed into the electrocatalytic reaction cell, and oxygen was introduced, and the Pt / Ti electrode was used as the anode, and the metal Cu electrode was used as the cathode, and the catalyst was catalyzed for 10 min. Solution COD=530 mg / L.

[0047] (3) LCWO: Use 1 mol / L sulfuric acid to adjust the pH to 7.5, add H 2 o 2 Catalytic oxidation at 60°C, effluent COD<10 mg / ...

Embodiment 3

[0053] In the neutralized waste water from the production of bromic acid, sodium sulfate was measured: 5.4% (mass fraction), ammonia nitrogen 44.9 mg / L, COD=2274mg / L, pH=10.73.

[0054] (1) Flocculation: add 0.03%wt aluminum chloride PAC and 0.01%wt polyacrylamide PAM to bromic acid neutralization wastewater, stir for 2h at 35°C, let stand for 1.5h, filter to obtain filtrate. The filter cake is red, and the filtrate is light red transparent clear liquid. Filtrate COD=490 mg / L, sodium sulfate 5.4%wt, ammonia nitrogen 2.5 mg / L.

[0055] (2) Electrocatalytic reduction: pass the filtrate after flocculation filtration into the electrocatalytic reaction cell, pass in oxygen, and use Ti / SnO 2 -Sb electrode as anode, graphite electrode as cathode, catalysis for 15 min. Solution COD=450 mg / L.

[0056] (3) LCWO: Use 1 mol / L sulfuric acid to adjust the pH to 7.1, add ClO dropwise 2 Catalytic oxidation at 60°C, effluent COD<10 mg / L.

[0057] (4) Electrodialysis: Electrodialysis is pe...

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Abstract

The invention discloses a treatment process of bromamine acid neutralizing wastewater. The treatment process mainly includes flocculation, electroreduction, low-temperature wet oxidation, electrodialysis and bipolar membrane dialysis. The treatment process using 'flocculation-electroreduction-LCWO-electrodialysis and bipolar membrane dialysis' as the main line has the advantages that the treatment process specially aims at the alkaline wastewater generated during the production of bromamine acid dye, the residual organic matter in the wastewater is gradually separated in a targeted manner, the COD and color in the wastewater are removed, acid and alkali of certain concentration are produced, and the treatment process is continuous and automatic in process flow, mild in reaction condition, simple to operate and evident in effect and has certain economic benefits.

Description

technical field [0001] The invention relates to the technical field of industrial waste water, in particular to a treatment method for bromic acid neutralized 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 charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/44C02F1/4676C02F1/4693C02F1/52C02F1/5236C02F1/722C02F1/725C02F9/00
Inventor 陈磊王慧吴勇前
Owner ZHEJIANG QICAI ECO TECH CO LTD
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