Method for treating organic wastewater

Abstract

The invention relates to a method for treating organic wastewater, which comprises the following steps: (I) adjusting the pH value of organic wastewater; (II) performing a Fenton reaction on the organic wastewater; (III) performing a coagulating sedimentation reaction; (IV) filtering the organic wastewater treated by step (III); and (V) adsorbing the organic wastewater treated by step (IV) by use of activated carbon, wherein in the process of step (II), ozone is supplied to the organic wastewater for the Fenton reaction. In the method provided by the invention, the hydrogen peroxide in the original Fenton reaction is replaced by ozone; under the catalysis of ferrous ions, the number of hydroxyls generated by ozone is about 3 times that of the hydroxyl generated by the same amount of hydrogen peroxide, thus the oxidation capacity of ozone is stronger, and the efficiency of the method is higher; after the treatment by the method, the removal rate of COD in the organic wastewater can reach 93%; and the treated organic wastewater can reach corresponding discharge standard.

Description

technical field [0001] The invention relates to a method for treating organic wastewater, which is especially suitable for treating high-concentration salt-containing organic wastewater. Background technique [0002] For a long time, high-concentration refractory organic wastewater has been a difficult problem in sewage treatment. This kind of water is mainly the wastewater produced in the production process of dyes, pesticides, biomedicine, and chemical industry. The pollutants in this kind of wastewater have complex composition, many types, high pollution concentration, high toxicity, and high salinity, which are difficult to biodegrade. If these substances are not treated and discharged into the environment, they will seriously pollute the ecological environment and threaten human health. It's handled properly. [0003] At present, the methods for treating organic wastewater are roughly divided into two categories: biological treatment methods and Fenton reaction treatm...

AI Technical Summary

Problems solved by technology

The pollutants in this kind of wastewater have complex composition, many types, high pollution concentration, high toxicity, and high salinity, which are difficult to biodegrade. If these substances are not treated and discharged into the environment, they will seriously pollute the ecological environment and threaten human health. its proper handling

[0003] At present, the methods for treating organic wastewater are roughly divided into two categories: biological treatment methods and Fenton reaction treatment. Because organic wastewater contains a large amount of salt and toxic substances, it is difficult for biological treatment methods to achieve better treatment effects; Fenton reaction treatment It mainly uses hydrogen peroxide and ferrous ions to react to generate hydroxyl radicals, which can quickly remove refractory organic substances that cannot be removed by traditional techniques

The advantage of the Fenton reaction is that the decomposition rate of hydrogen peroxide is fast and the oxidation rate is high. However, due to the presence of a large amount of ferrous ions, the utilization rate of hydrogen peroxide is not high, which makes the degradation of organic matter incomplete.

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