Attention: Aniline Compounds In Printing And Dyeing Wastewater Are Potentially Harmful

The lipophilicity of disperse azo dyes may increase their migration from fabric to skin. When absorbed, they are metabolized by the cleavage of azo bonds and thus release amines. It is also proved that azo dyes can be metabolized into aromatic amines by human skin bacteria.

Several compounds belonging to these compounds have been shown to show an increased risk of bladder cancer. Quinoline is considered to be carcinogenic to human and toxic to aquatic environment. It is also widely used in textile industry to make dyes. The presence of these compounds has been reported in textile materials and wastewater and sludge from dye processing plants.

The 13 kinds of dyes of aniline are nonstructural, but the dyes synthesized from aniline are difficult to check and mainly depend on dye factories Dye enterprises and dyeing and finishing enterprises were originally a community of destiny Hope that Dyestuff Factory will not produce aniline as raw material dyestuff to enter the market

This kind of organic matter has great potential harm and is difficult to degrade. Therefore, it is urgent to strengthen the supervision of wastewater containing aniline and study effective treatment methods.

The concentration limit of aniline in textile dyeing and finishing industry (gb4287-2012) issued by the Ministry of environmental protection and implemented on January 1, 2013 is 1mg / L.

1、 Physical treatment of aniline compounds in printing and dyeing wastewater

Aniline compounds belong to organic compounds. Many treatment methods of organic compounds in wastewater are also suitable for the removal of aniline compounds in wastewater. The physical treatment methods of aniline compounds in wastewater can be divided into adsorption method, extraction method, membrane separation method and distillation method.

In recent years, chemically modified polymer adsorbents with phenolic radical, acetyl group, benzoyl group, light methyl group, o-terminal benzoyl group and other functional groups have been synthesized and applied in poison control.

2、 Chemical treatment of aniline compounds in printing and dyeing wastewater

Supercritical water oxidation (SCWO) is considered to be a promising technology for the treatment of toxic and biologically refractory wastes. It is well known that supercritical water is completely miscible with oxygen and air, and highly soluble for organic compounds, which leads to SCW acting as an intermediate between gaseous and liquid state. In the SCWO process, aniline compounds are rapidly mineralized into CO2, H2O, N2 and a small amount of inorganic salts.

3、 Biological treatment of aniline compounds in printing and dyeing wastewater

Biological process, especially microbial process, is widely used in the treatment of printing and dyeing wastewater containing a lot of organic matter. This method can degrade organic pollutants step by step, and finally form stable simple compounds. It is characterized by low application cost, no secondary pollution and good ecological adaptability.

The removal mechanism of aniline compounds in printing and dyeing wastewater should be studied in a deeper and multi angle way; Supercritical water oxidation can effectively remove the pollutants in printing and dyeing wastewater, but the cost is high, it needs a lot of investment, and the corrosion of equipment should be paid attention to. Therefore, for different properties and characteristics of wastewater, reasonable analysis and research should be carried out to select the appropriate treatment process and method.

The government departments in charge should take the responsibility of management, strengthen the propaganda of environmental protection. The printing and dyeing process should achieve clean production at the source, choose green and pollution-free dyes, accelerate the research and development and use of environmental protection materials, and reduce the loss of dyes, so as to control the formation or potential formation mechanism of Phenylamine compounds at the source.