Catalytic ozonation fluidized bed reactor for efficiently removing CODcr in wastewater

Abstract

The invention discloses a catalytic ozonation fluidized bed reactor for efficiently removing CODcr in wastewater and belongs to the field of sewage treatment equipment. The reactor comprises a fluidized bed reactor body, a solid-liquid separation system, an ozone oxidation system, a powdered catalytic oxidant addition system and a powdered catalytic oxidant recycling system. The reactor has the outstanding capacity of removing difficultly biodegraded organic pollutants in wastewater in the industries such as coal chemical industry, steel, biological pharmacy and printing and dyeing, can serve as a pretreatment system of a membrane filtration system and can also be used for industries and regions executing the high COD emission standard. The COFR technology has the advantages of low investment cost, simple structure and simplicity and convenience in operation, the COD removal rate is high, secondary pollution is avoided, the modular combination mode is convenient to design and implement, the COFR reactor can be combined with other water treatment methods, the problems that the sewage treatment in the coal chemical industry, pharmacy, printing and dyeing and other related industries does not reach the standard and the concentrated water in nanofiltration reverse osmosis and other processes cannot be treated can be effectively solved, and the reactor is an effective and practical novel technology and is widely applied and popularized.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for efficiently removing COD in wastewater cr Catalytic Ozonation Fluidized Bed Reactor. Background technique [0002] In the ozonation system, the catalyst (solid) and the reaction solution are in different phases, and the oxidation method that reacts at the solid-liquid phase interface is called heterogeneous catalytic ozonation. [0003] In recent years, heterogeneous catalytic ozonation technology has become one of the key technologies for removing highly stable and refractory organic pollutants in water. The use of solid catalysts to cooperate with ozone oxidation can reduce the activation energy of the reaction or change the reaction process, so as to achieve the purpose of deep oxidation and maximum removal of organic pollutants. [0004] The researchers found that under acidic conditions, O 3 / TiO 2 The system can effectively degrade oxalic acid, and the cataly...

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Problems solved by technology

[0006] According to the research of the above researchers, the mode of heterogeneous catalytic ozonation can effectively improve the removal efficiency of organic matter, thereby reducing the concentration of organic matter in water and achieving the purpose of water treatment. However, the catalysts used in existing reactors are mostly Granular carrier and honeycomb ceramic carrier have to be in the form of a filter tank, the reaction contact area is greatly affected, and the contact catalysis between the organic matter and the catalyst directly affects the limiting step of the reaction, so the reaction efficiency is not good. At the same time, there are also problems such as the catalyst filter tank is easy to block, and needs to be backwashed and replaced regularly. These problems have affected the promotion and use of the catalytic oxidation reaction process.

Therefore, how to provide a high-efficiency catalytic ozone oxidation reactor that is not limited by the contact between the catalyst and pollutants has become a research topic for many researchers. Most researchers have thought of using a powder catalyst for ozone catalytic oxidation, but the powder It is difficult to effectively separate catalysts in the shape of water from water. For example, if the traditional filtration method is used, not only the flux is large, but also the clogging is serious. Uneconomical, so it cannot be applied to engineering practice on a large scale

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