Method for treating organic pollutants in water

Abstract

The invention provides a method for treating organic pollutants in water. Pollutant treatment is conducted by strengthening the Fe<0> air oxidation reaction with a weak magnetic field; the method comprises the steps as follows: a, the weak magnetic field is arranged at the bottom of a reactor exposed to the air, and the pH value of the water containing the organic pollutants is kept in the neutral range of 6.5-7.5; b, zero-valent iron is directly added to the reactor, the organic pollutants are subjected to oxidative degradation by the aid of hydroxyl and free radicals produced in the Fe<0> air oxidation reaction, and the water containing the organic pollutants is purified. Compared with an original Fe<0> air oxidation system, the scheme has the advantages as follows: the reaction rate for degradation of the organic pollutants is greatly increased, and the sewage treatment efficiency is greatly improved; and compared with existing other methods for strengthening the Fe<0> air oxidation system, the method has the advantages that all that is required is to arrange the weak magnetic field, the reaction process is easy to control, no chemical agents are required to be added additionally, and no toxic metals are left after the reaction.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a method for treating organic pollutants in water by utilizing a weak magnetic field to strengthen air oxidation FeO reaction. Background technique [0002] With the rapid development of modern industry, the types and quantities of organic pollutants in water continue to increase, and many organic substances are listed as priority pollutants in water. The structure of organic pollutants in water is complex and difficult to deal with, which poses a serious threat to the environment and human health. [0003] Zero-valent iron has the advantages of being cheap, safe and easy to obtain, will not cause secondary pollution to the environment, and can treat a variety of toxic and harmful pollutants, so it is widely used in the removal of environmental pollutants. In the early 1970s, a patent for the reduction and removal of chlorides by zero-valent iron appeared. In t...

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Problems solved by technology

However, the particle size of nano-zero-valent iron is small, the specific surface area is large, and the reactivity is extremely strong. However, the price of nano-zero-valent iron is more than 50 times higher than that of ordinary iron powder, and it is easy to agglomerate, and it is inconvenient to transport and operate when it is burned in air. It reacts quickly with water and only a small part of nano-iron can play a characteristic role in degrading pollutants, and the toxicity of nano-zero-valent iron is also a hot spot of concern at present.

According to literature reports, adding a complexing agent can enhance the performance of the air oxidation Fe0 system to degrade organic pollutants, but complexing agents such as EDTA are also organic pollutants, which cannot solve the problem of degradation of organic pollutants in water

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