Method for degrading dyeing wastewater by using metal-free catalytic system

Abstract

The invention discloses a method for degrading dyeing wastewater by using a metal-free catalytic system. According to the method, a metal-free catalyst activation oxidizer is utilized to generate reactive species (hydroxy free radicals -OH which have higher oxidation-reduction potential 1.8-2.7V) at normal temperature, thereby degrading dyeing wastewater efficiently. The method disclosed by the invention overcomes the defects of secondary pollution, low oxydol utilization ratio, narrow pH application range and the like in the traditional Fenton process, has the advantages of mild reaction conditions, obvious removal effect, no metal pollution, small environmental hazard, low catalyst consumption and low cost, and is simple to operate.

Description

technical field [0001] The invention belongs to the field of printing and dyeing wastewater treatment methods, in particular to a method for degrading printing and dyeing wastewater with a metal-free catalytic system. Background technique [0002] my country is a big textile country. According to the "National Environmental Statistical Bulletin", the discharge of textile wastewater in my country has reached more than two billion tons, of which printing and dyeing wastewater accounts for about 80%, which has caused serious pollution to the environment. Therefore, how to efficiently treat printing and dyeing wastewater has always been an urgent problem to be solved. [0003] At present, the more commonly used and effective method for treating printing and dyeing wastewater is the Fenton method. The Fenton method is a kind of advanced oxidation technology, and its reaction reagent is composed of ferrous ion and hydrogen peroxide (H 2 o 2 ) composition, the hydroxyl radical (...

AI Technical Summary

Problems solved by technology

Although the Fenton method has the advantages of easy operation, no need to consume external energy, and complete oxidation, there are still some inherent defects in the traditional Fenton reaction: (1) The pH value of the Fenton reaction is narrow, and it can only be carried out in a strongly acidic medium of 2-4 (2) A large amount of iron ions that exist in the reaction system are difficult to remove, and easily form sludge, causing secondary pollution

Although the above catalytic system can efficiently degrade printing and dyeing wastewater, the catalysts used all contain metal ions, and there will inevitably be a certain degree of metal loss during use, which greatly limits the practical application of the catalytic system.

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