Method for removing diclofenac contained in sewage by utilizing copper-iron heterogeneous fenton technology

Abstract

The invention relates to a method for removing diclofenac contained in sewage by utilizing a copper-iron heterogeneous fenton technology. The method comprises the following steps: adding bivalent copper salt, nanometer zero-valent iron and hydrogen peroxide to the sewage which contains the diclofenac under the condition that a pH value is 3-5, reacting for 3-12 minutes, oxygenizing to remove the diclofenac contained in the sewage, wherein the mass concentration of the diclofenac contained in the sewage is 1-50 milligrams / litre, the addition amount of the bivalent copper salt added to every litre of the sewage is 50-1000 milligrams, the addition amount of the nanometer zero-valent iron added to every litre of the sewage is 0.5-3.0 grams, and the addition amount of the hydrogen peroxide added to every litre of the sewage is 400-1000 milligrams. Compared with the prior art, the method disclosed by the invention has the advantages that the bivalent copper salt, the nanometer zero-valent iron and the hydrogen peroxide are added to waste water which contains the diclofenac and a bimetal system can promote the velocity of Fenton reaction because the electron affinity of Cu is relatively higher, thereby accelerating the reaction velocity; the method disclosed by the invention can achieve very good removal effect at normal temperature and pressure because the reaction temperature is unlimited and achieve high removal rate on the diclofenac without secondary pollution and is favorable to the recycling of the sewage.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for removing diclofenac in sewage by using copper-iron heterogeneous Fenton technology. Background technique [0002] The pharmaceutical industry has many types of products and complex production processes. The pharmaceutical wastewater produced has the characteristics of complex components, high organic content, high toxicity, dark color, and poor biodegradability. Biological treatment is difficult. If the pharmaceutical wastewater is not effectively treated in the sewage treatment station of the pharmaceutical factory and discharged into the urban sewage plant, the concentration of pharmaceutical pollutants in the urban sewage will increase, thereby increasing the sewage treatment load and difficulty of the urban sewage plant. Studies have shown that pharmaceuticals and personal hygiene products are common trace organic pollutants found in water and sewage after pesticides,...

AI Technical Summary

Problems solved by technology

However, there are defects in the traditional Fenton system. For example, the acidic nature of Fe(II) requires the pH of the system to be maintained at about 3-4, otherwise the iron salt will be precipitated as iron hydroxide, which will reduce the catalytic effect of hydrogen peroxide.

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