Enzyme electric coupling catalyzation for treating waste water containing phenol, aromatic amine and azo-dye

Abstract

An enzyme electric couple catalyzing method for treating waste water containing phenol, aromatic amine and azo-dye is carried out by fixing horse-radish peroxidase or analog enzyme with enzyme activity on grinded pyrolyzed graphite electrode surface by surface activator and carboxy-carbon nano-pipe, making into solid-carried enzyme or analog enzyme electrode, taking solid-carried enzyme or analog enzyme electrode as cathode, taking graphite electrode as anode, pumping waste water containing phenol, aromatic amine and azo-dye into cathode chamber, inducing oxygen and air into cathode chamber to saturate, controlling cathode electric potential at -1.00--0.500V vs.SCE by constant potentiometer and constant-potential electrolyzing. It has fast degradation speed and high current efficiency.

Description

field of invention [0001] The invention relates to the treatment of wastewater containing phenols, aromatic amines and azo dyes, in particular to a method for decomposing wastewater containing phenols, aromatic amines and azo dyes through catalytic oxidation with enzyme electrical coupling. Background technique [0002] Phenols, aromatic amines and azo dyes are important chemicals widely used in industrial and agricultural production, with large emissions and serious pollution. They have high stability and high biological toxicity, which seriously threaten human health. These pollutants are generally difficult to biodegrade, and traditional biological treatment is difficult to be effective. The use of enzymes instead of microorganisms does not require the growth conditions required by microorganisms, and the drug resistance is also greatly improved. The enzymatic method mainly uses horseradish catalase to catalyze the oxidation of phenols, aromatic amines and azo dyes with...

AI Technical Summary

Problems solved by technology

Coagulation treatment is difficult to meet the standard, and it is often used as pretreatment. At the same time, the treatment effect on water-soluble phenols and hydrophilic dyes is very poor

Although adsorption, extraction and membrane separation have the advantage of being able to recover materials, the treatment costs are relatively high due to the desorption regeneration of the adsorbent, the recovery of the extractant and membrane pollution, and are more suitable for the recovery of some high-value organic matter.

When organics have little recycling value or complex composition, their economic viability is greatly reduced

For example, Chinese patent CN1403382A has reported a method of utilizing macroporous resin to adsorb and treat 2-methyl-4-chlorophenoxyacetic acid production wastewater, which can recycle o-cresol, but this method is aimed at specific 2-methyl-4-chlorobenzene Oxyacetic acid production wastewater is feasible, but it will be difficult to extend to other wastewater containing phenols, aromatic amines and azo dyes due to cost reasons

Chinese patent CN1450006A uses extractive distillation to treat phenol-containing wastewater. The wastewater only meets the national third-level discharge standard, and the cost is very high.

These methods are often costly and poor in economic feasibility. For example, the low utilization rate of hydrogen peroxide in the Fenton method makes the cost high, the low current efficiency of the electrolysis method makes the energy consumption high, and catalytic wet oxidation requires high temperature and high pressure, etc.

People have developed a so-called "electricity-Fenton" method based on the high cost of hydrogen peroxide in the Fenton method, which utilizes oxygen to be reduced to hydrogen peroxide at the cathode, and the anodic iron oxide electrode produces iron ions, thereby forming the Fenton process (such as the Chinese patent CN1600700A)

However, the oxygen reduction potential overpotential is high, so that the current efficiency is still not high, and iron sludge pollution still exists

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