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Method for degrading azo dye gold orange G in wastewater

A technology for azo dyes and waste water, applied in water pollutants, chemical instruments and methods, textile industry waste water treatment, etc., can solve the problem of deep dependence on microbial physiological properties, poor removal effect of azo dyes, and poor activation of peracetic acid and other problems, to achieve the effects of shortening the processing time, having practicability and operability, and being easy to prepare

Inactive Publication Date: 2018-07-20
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is mainly based on the biodegradation of azo dyes, and activated carbon plays the role of domesticating microorganisms, which is highly dependent on the physiological properties of microorganisms, and the operation method is complicated and the efficiency is not high.
[0005] The application number is that the patent literature of CN101450827 discloses the technique of wet catalytic oxidation treatment high-concentration organic wastewater; It also used activated carbon and peracetic acid respectively in the water treatment process, but the activated carbon activated peracetic acid effect that it uses is relatively poor, only Can treat COD and BOD in wastewater 5 , the removal effect of azo dyes such as golden orange G is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Firstly, phenol-modified straw activated carbon is prepared, and the preparation process is as follows:

[0024] (1) Pretreatment of stalks: cut the stalks to 5cm, place them in 2wt% NaOH impregnating solution for 48 hours, wash until neutral, dry in an oven at 105°C, and place them in 30wt% (NH 4 ) 2 HPO 4 In the dipping solution for 24h, then dry in an oven at 105°C;

[0025] (2) The stalks treated in step (1) were pre-oxidized in a constant temperature blast oven at 200°C for 2 hours, then activated in a box-type atmosphere furnace at 700°C for 60 minutes, nitrogen gas was introduced during activation, and ground for 100 minutes after completion mesh sieve to obtain straw activated carbon;

[0026] (3) Place the straw activated carbon prepared in step (2) in a phenol impregnation solution with a concentration of 1.0mmol / L for 24h, then centrifuge for 20min, put the solid activated carbon into an oven for drying at 80°C, and then place it in an atmosphere furnace a...

Embodiment 2

[0029] The preparation method of phenol-modified straw activated carbon is shown in Example 1.

[0030] Get 0.75ml of the prepared golden orange G solution (2g / L) and add it to 99.05ml of printing and dyeing wastewater with pH=7, place a magnetic stirrer under the condition of 860-880rpm, add the prepared peracetic acid solution (10g / L) 0.3ml, quickly adjust the pH to 7, then add 10mg of phenol-modified straw activated carbon AC prepared by the above method, and react at room temperature for 180min.

Embodiment 3

[0032] The preparation method of phenol-modified straw activated carbon is shown in Example 1.

[0033] Get 1ml of the prepared golden orange G solution (2g / L) and add it to 99.3ml of printing and dyeing wastewater with pH=7, place a magnetic stirrer under the condition of 860-880rpm, add the prepared peracetic acid solution (10g / L L) 0.2ml, quickly adjust the pH to 7, then add 20mg of phenol-modified straw activated carbon AC prepared by the above method, and react at room temperature for 180min.

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PUM

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Abstract

The invention relates to a method for treating printing and dyeing wastewater. The method includes the steps of adding a certain amount of peracetic acid (PAA) and modified straw activated carbon (AC)to wastewater containing azo dye gold orange G under normal temperature and normal pressure; stirring evenly, and reacting for 3 h under the initial neutral pH condition to oxidize and degrade pollutants. By adding peracetic acid and modified straw activated carbon into the printing and dyeing wastewater, the modified straw activated carbon has a certain absorption effect and activates peraceticacid to generate hydroxyl radical oxidation pollutants, thereby degrading the printing and dyeing wastewater. According to the method, rapid, efficient and long-lasting removal of azo dyes in wastewater can be achieved, the reaction conditions are mild, the treatment time is greatly shortened, the process cost is reduced, AC can also be reused to reduce the cost, and the method has broad application prospects in the degradation and removal of azo dyes.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for activating peracetic acid with modified straw activated carbon (AC) to remove azo dye golden orange G in wastewater. Background technique [0002] Azo dyes have the characteristics of color fastness, many types, and stable properties, and are widely used in textile, printing and dyeing industries; however, their wastewater has the characteristics of high toxicity, high chroma, and refractory degradation. If it is not treated, it will be directly discharged into the water body It will cause serious environmental problems, so it has received extensive attention in the field of environmental protection. Existing traditional treatment processes such as flocculation, adsorption and membrane filtration only remove azo dyes from water without degrading them; although biological treatment can destroy the azo bond of its decolorizing group, it is time-consuming a...

Claims

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Application Information

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IPC IPC(8): C02F1/72C01B32/324C01B32/348C02F101/38
CPCC02F1/722C02F2101/308C02F2101/38C02F2103/30
Inventor 黄天寅陈家斌沈芷璇田丹
Owner SUZHOU UNIV OF SCI & TECH
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