Printing and dyeing wastewater treatment method

Abstract

The invention provides a printing and dyeing wastewater treatment method. An iron-base alloy raw material being capable of forming an amorphous alloy strip is employed in the method and is processed to form an iron-base amorphous alloy strip. The iron-base amorphous alloy strip then is embrittled and smashed to obtain iron-base amorphous alloy powder. The iron-base amorphous alloy powder is used in printing and dyeing wastewater treatment. Compared with the prior art, the iron-base amorphous alloy powder has a high specific surface area and can form a nano porous structure on surface when being reacted with printing and dyeing wastewater. The nano porous structure can not only increase the specific surface area of the iron-base amorphous alloy further but also has the effects of adsorb azo dyes and reaction products during a reaction process, thereby increasing efficiency of the iron-base amorphous alloy powder in printing and dyeing wastewater treatment.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing sewage treatment, in particular to a treatment method for printing and dyeing sewage. Background technique [0002] Water treatment is an eternal subject for human beings. With the development of my country's economy, the national water consumption is increasing year by year, and the total amount of wastewater discharge is increasing. The increasing total amount of wastewater discharge increases the pressure on water treatment. The textile industry is a traditional pillar industry in my country. The "three wastes" discharged during the production process of the printing and dyeing industry, especially wastewater, will cause serious pollution to the environment if not properly treated. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in my country is 4 to 6 million cubic meters. Printing and dyeing wastewater has the characteristics of large wa...

AI Technical Summary

Problems solved by technology

[0005] However, in the process of treating printing and dyeing wastewater with reduced iron powder, there are the following problems: (1) Iron powder is often a commercial and standard brick; compared with reduced iron powder, the purity and activity of cast iron waste are poor, resulting in the need for Long treatment time can reach the standard of follow-up treatment; (2) this method has certain requirements on the pH value of printing and dyeing wastewater, which requires pH adjustment of large quantities of printing and dyeing wastewater, resulting in inconvenient practical application; (3) iron There is a serious compaction problem in water micro-electrolysis; although the use of nano-iron powder can prevent compaction to a certain extent, it also has a larger specific surface area, but the manufacture of nano-iron powder is very difficult, it is difficult to realize industrial production, and the cost is high; ( 4) Due to the serious oxidation of reduced iron powder and cast iron scraps in the actual printing and dyeing wastewater treatment process, the rust and consumption of iron are caused, and because iron is very easy to react with acid, the recovery of its surface reduction ability can be realized by pickling Poor operability brings difficulties to the reuse of reduced iron powder or cast iron waste, and often only one wastewater treatment can be performed, resulting in an increase in the cost of this method and limiting its wide application

However, the efficiency of Fe-based amorphous strips in treating printing and dyeing wastewater is still low, which cannot meet the actual needs of printing and dyeing wastewater treatment.

Images