Interlock-control modular Fenton reagent wastewater treatment method and device

Abstract

The invention discloses an interlock-control modular Fenton reagent wastewater treatment method and device. The wastewater sequentially goes through a first adjusting tank, a second adjusting tank, a strong oxidation reaction tank, a pH value back-adjusting tank and a flocculating tank, wherein the pH value of the wastewater is adjusted to 3.0-5.0 in the first adjusting tank; H2O2 is added after the wastewater enters the second adjusting tank so as to control the redox potential of the wastewater in the strong-oxidation reaction tank to 1.8-2.8V; the wastewater reacts in the strong-oxidation reaction tank; sodium hydroxide is added into the pH value back-adjusting tank so that the pH value of the wastewater is adjusted back to 6-9; finally, the wastewater enters the flocculating tank, and a flocculating agent is added into the flocculating tank. In the method and device disclosed by the invention, with multiple reaction tanks, the reaction is more sufficient, the generation of intermediate products is reduced, the oxidant utilization rate is improved, continuous water supply and continuous reaction are realized, the automation degree and accuracy of the drug adding amount are improved, quantization control on drug adding can be realized, and the operation error and operation difficulty are reduced.

Description

technical field [0001] The invention relates to a Fenton reagent reaction method and device for wastewater treatment, belonging to the technical field of sewage treatment. Background technique [0002] Fenton's reagent method is a commonly used advanced oxidation technology for wastewater treatment, which has a high ability to remove refractory organic pollutants. The principle of the Fenton reagent method catalytic oxidation treatment process is to use H 2 o 2 Catalytic oxidation reaction mechanism with iron salts, etc., produces extremely strong oxidizing hydroxyl radicals (OH), with the help of hydroxyl radicals, which have the characteristics of "attacking" the high electron cloud density parts in organic molecules, destroying the molecular chain structure, making large Part of the refractory organic matter is quickly and completely mineralized by OH radicals to CO 2 and H 2 O. The strong oxidation reaction is mainly carried out in a stirred reaction tank. [0003]...

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Problems solved by technology

[0003] The Fenton reagent method is an effective wastewater treatment method, but at present the main reaction method is carried out in a stirred reaction tank, which is generally a discontinuous reaction, and there are the following problems: (1) The reaction conditions are not easy to grasp, the adjustment range of pH value, The optimal dosage of chemicals needs manual control, which is easy to cause errors and difficult to work; (2) the organic matter cannot be fully mineralized, and the initial material is partially converted into some intermediate products, which may be combined with Fe 3+ Form complexes, or compete with the generation route of hydroxyl radical OH, and may be more harmful to the environment; (3) The reaction parameters cannot be precisely controlled, resulting in inaccurate dosage of chemicals, such as H 2 o 2 The utilization rate is not high

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