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Method for treating disperse blue 56 reducing mother-liquor wastewater

A treatment method and technology for dispersing blue, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as waste of resources and failure to realize the recovery of inorganic sodium salts

Active Publication Date: 2015-05-13
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although this invention has realized the resource utilization of phenol, it has not realized the recovery of inorganic sodium salt, resulting in a waste of resources

Method used

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  • Method for treating disperse blue 56 reducing mother-liquor wastewater
  • Method for treating disperse blue 56 reducing mother-liquor wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Disperse Blue 56 reduced mother liquor wastewater was initially filtered, and the measured pH was 13.6, COD was about 28440mg / L, containing 2.2% sodium sulfide (based on wastewater quality), and 0.4% sodium hydroxide (based on wastewater quality), Wastewater is dark blue suspension.

[0078] (1) Reduction: Add 9g of sulfur to 400mL of waste water, heat to 100°C, keep stirring for 1.5h.

[0079] In the reduction reaction, the hydroxide ions in the system participate in the reaction, and the pH value of the system decreases continuously during the reaction process, and it is necessary to ensure that the pH value is not lower than 8.

[0080] (2) Oxidation: Oxygen is introduced into the waste water after reduction, the temperature is lowered to 50° C. after the heat preservation reaction is continued for 4 hours, filtrate I is obtained by filtration, and sulfur is recovered.

[0081] The pH and temperature were monitored online throughout the reaction, and the pH was adju...

Embodiment 2

[0104] Disperse blue 56 reduced mother liquor wastewater was pre-filtered, pH > 14, COD about 38575mg / L, sodium sulfide 3.2%, sodium hydroxide 0.49%, overall dark blue suspension.

[0105] (1) Reduction: Add 9g of sulfur to 400mL of wastewater, and keep it warm at 80°C for 2.5 hours under stirring conditions. The hydroxide ions in the system will participate in the reaction during the reduction reaction. Its pH value is not lower than 8.

[0106] (2) Oxidation: Feed oxygen into the waste water after reduction, continue to insulate for 4 hours, cool down and filter, obtain filtrate I, reclaim sulfur. After the reaction, the waste water had no obvious color change.

[0107] During the whole reaction, the pH of the reaction system was controlled to be 8 with an aqueous solution of sodium carbonate with a mass fraction of 30%.

[0108] (3) Flocculation: Add a mixed flocculant to the filtrate I {preparation method: add PAC (polyaluminum chloride) 0.03 g, BWD-01 (dicyandiamide for...

Embodiment 3

[0122] Disperse blue 56 reduction mother liquor wastewater was pre-filtered, and the measured pH was 13.6, COD was about 28440mg / L, containing 2.2% sodium sulfide and 0.4% sodium hydroxide, and the wastewater was dark blue suspension.

[0123] (1) Reduction: Add 11g of sulfur to 400mL of waste water, and keep it warm at 100°C for 1.5 hours under stirring conditions. During the reduction reaction, the hydroxide ions in the system will participate in the reaction. Its pH value is not lower than 8.

[0124] (2) Oxidation: Feed oxygen into the waste water after the reduction, continue the heat preservation reaction for 3 hours and then cool down and filter to obtain filtrate I and reclaim sulfur. After the reaction, the waste water had no obvious color change.

[0125] During the whole reaction process, the pH of the reaction system was controlled to be 9 with a mixed aqueous solution of sodium hydroxide and sodium carbonate with a mass fraction of 30%.

[0126] (3) Flocculation...

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Abstract

The invention discloses a method for treating disperse blue 56 reducing mother-liquor wastewater. The method is characterized by comprising the following steps: (1) reduction: adding sulfur into disperse blue 56 reducing mother-liquor wastewater, and heating and stirring for reaction; (2) oxidation: pumping oxygen into the reduced wastewater for oxidation, and filtering to obtain a filtrate I and unreacted sulfur; (3) flocculation: adding a flocculant into the filtrate I, stirring for flocculation, and filtering to obtain a filtrate II; (4) reductive decoloration: adding a reductive decolorizer into the pickled filtrate II, and concentrating and separating to obtain a filtrate V and a filter cake I; (5) crystallization: adding a sodium thiosulfate seed crystal into the cooled filtrate V for crystallization, and separating to obtain solid sodium thiosulfate pentahydrate and a centrifugate. The method is concise in technological process, simple to operate, and mild in conditions, can treat wastewater through additional cheap raw materials to produce high-value products, makes the best of resources in wastewater and improves the added value of wastewater treatment.

Description

technical field [0001] The invention relates to a waste water treatment method, in particular to a treatment method for disperse blue 56 reduction mother liquid waste water. Background technique [0002] Disperse blue 56, also known as disperse blue 2BLN or a mixture of 1,5-dihydroxy-4,8-diaminoanthraquinone bromide and 1,8-dihydroxy-4,8-diaminoanthraquinone bromide, is a Important disperse dyes. It is mainly used for dyeing polyester and its blended fabrics, nylon, polyester fiber, etc., and can also be used for dyeing superfine fibers. It is one of the three primary colors. [0003] The production process of Disperse Blue 56 mainly includes mercury method and non-mercury method. Among them, the mercury method has been discontinued due to serious pollution. After several improvements, the currently widely used process is the non-mercury phenoxy method. The common process is nitration-phenoxylation-secondary nitration-hydrolysis-reduction-bromination. There are about 14 ...

Claims

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Application Information

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IPC IPC(8): C02F9/08C01B17/64
Inventor 钱枞诚郑鑫钟芳华陈磊张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
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