Method for degrading azoic dye waste water

Abstract

The invention relates to a method for degrading azo dye wastewater. In the invention, firstly the liquid-phase electroless plating method is used for loading Fe-Ni double metallics on the surface of hollow glass microballoon so as to modify the hollow glass microballoon; then the hollow glass microballoon after modification is taken as a sorbent for degrading azo dye wastewater. In one aspect, the loading problem of catalyzer (Fe-Ni) is solved, and the catalyzer can exist in solid state and also separate from the wastewater easily; in the other aspect, the absorption ability of the carrier (hollow glass microballoon) also provides concentration environment for catalytic reaction, and the rate of reaction is improved; additionally, the surface area of catalyzer is increased, thus facilitating the active center to increase. The operation of the method is simple, a secondary pollution can not be aroused, the cost is relatively low, the treatment efficiency is relatively high, and the method is a better method for disposing azo dye wastewater.

Description

technical field [0001] The invention relates to a method for degrading waste water containing azo dyes. Background technique [0002] In the molecular structure of dyes, all dyes containing azo groups (-N=N-) are collectively referred to as azo dyes. Among them, the azo group is often connected with one or more aromatic ring systems to form a conjugated system as the color body of the dye. There are more than 3,000 kinds of azo dyes currently in use, which are widely used in dyeing and printing processes such as textiles and leather products. After azo dyes are in long-term contact with human skin, they mix with the components released during the metabolic process, resulting in a reduction reaction to form carcinogenic aromatic amine compounds. This compound will be absorbed by the body, causing dermatitis symptoms such as erythema, blisters, and papules. Improper handling may also cause bacterial infections, and stimulate pustules, suppuration, etc. Through a series of b...

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Problems solved by technology

Among them, the biochemical method is difficult to adapt to the characteristics of dye wastewater with large fluctuations in water quality and strong biological toxicity, and the treatment efficiency is low; the coagulation method will generate a large amount of sludge, which is likely to cause secondary pollution; the treatment cost of activated carbon adsorption, membrane separation and advanced oxidation method Higher, especially the advanced oxidation method is currently mostly in the laboratory research stage and has not been practically applied

Although the zero-valent iron reduction method has always been an important method to treat dye wastewater, the reduction speed of ordinary zero-valent iron is slow and the efficiency is low.

In terms of the treatment of azo dye wastewater, the deficiencies of the above-mentioned methods are even more obvious.

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