Ozone/hydrogen peroxide synergistic oxidation high-salinity wastewater treatment method

Abstract

The invention discloses an ozone / hydrogen peroxide synergistic oxidation high-salinity wastewater treatment method. The method comprises the following steps: 1) putting high-salinity wastewater into an oxidation reactor; and 2) performing catalytic oxidation reaction on the high-salinity wastewater through ozone / hydrogen peroxide activation treatment, and applying a radio frequency electric field to the oxidation reactor. Compared with the prior art, the ozone / hydrogen peroxide synergistic oxidation high-salinity wastewater treatment method has the following advantages that radio frequency electric field coupling ozone / hydrogen peroxide catalytic oxidation is adopted, the agent dosage can be reduced by 50% or above, the method is not sensitive to the pH value, the pH does not need to be adjusted in the treatment process, impurity ions such as Fe are not introduced, and the method is suitable for the industry with salt recovery requirements.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and more specifically, the invention relates to a high-salt waste water treatment method based on the coordinated oxidation of ozone / hydrogen peroxide. Background technique [0002] In coking, printing and dyeing, pharmaceutical, petrochemical and other industrial production processes, a large amount of high-salt wastewater containing toxic organic substances will be produced. High-salt wastewater cannot be directly removed by biochemical treatment. It is usually necessary to crystallize and separate the industrial salt in the wastewater before processing. Biochemical treatment leads to the generation of toxic industrial waste salt, which cannot be recycled as a resource. In addition, because organic matter in high-salt wastewater contains formaldehyde, alcohols, and refractory, high-boiling phenolic substances, conventional catalytic oxidation cannot be processed. [0003] As a ne...

AI Technical Summary

Problems solved by technology

The Fenton process is generally applicable to the situation where the COD concentration is around 10,000 mg / L. If the COD of the wastewater is too high, multi-stage oxidation purification treatment is required, and the Fenton process has no advantage

[0004] However, in the process of treating high-salt wastewater by the Fenton process, the cost of electric energy and chemical reagents is high, and there are problems such as high requirements for reaction conditions (pH, temperature, etc.), and difficult recovery of catalysts.

Fenton advanced oxidation technology is greatly affected by pH in the wastewater treatment process. When the acidity is strong, the H in the solution + Concentration is too high, hydrogen peroxide as H 3 o 2+ The form is stable, and the organic matter is not easy to decompose in the strong acidic environment, Fe 3+ Cannot be successfully reduced to Fe 2+ , the catalytic reaction is hindered, more iron-containing sludge is produced, and the effluent is colored

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