Catalytic ozonation and Fenton-like coupling reactor and method for treating toxic refractory wastewater

Abstract

The invention provides a catalytic ozonation and Fenton-like coupling reactor which comprises a reaction tank, an ozone generator, a residual ozone removal device, a jet device, a water inlet pump, a backflow pump, wastewater backflow pipes, a water outlet pipe, ozone gas supply pipes, an ozone delivery pipe, ozone backflow pipes, a residual ozone exhaust pipe and gas flow meters.The invention further provides a method for treating toxic refractory wastewater.The method is implemented by the aid of the reactor, and includes continuously filling the jet device with the to-be-treated wastewater and ozone; mixing the to-be-treated wastewater and the ozone with each other in the jet device to obtain a mixture and feeding the mixture into the reaction tank; starting the backflow pump to allow micron-grade iron-based catalytic materials in the reaction tank to be in fluidization states; continuously draining treated wastewater out of the reaction tank; delivering the ozone in a gas collecting hood into the ozone delivery pipe to be recycled and delivering the ozone into the residual ozone removal device to be treated.The catalytic ozonation and Fenton-like coupling reactor and the method have the advantages that the wastewater treatment efficiency can be effectively improved under the synergistic effects of catalytic ozonation and Fenton-like reaction, and the wastewater treatment cost can be effectively reduced under the synergistic effects of catalytic ozonation and Fenton-like reaction.

Description

technical field [0001] The invention belongs to the field of toxic and refractory wastewater treatment, in particular to a catalytic ozonation-Fenton-like coupled reactor and a treatment method for toxic and refractory wastewater. Background technique [0002] Fenton-like method and catalytic ozonation method are common methods for pretreatment or advanced treatment of toxic and refractory wastewater. The Fenton-like method refers to the transformation of zero-valent iron and iron-based multimetallic materials into O 2 reduced to H 2 o 2 , then at Fe 2+ Under the catalytic action of catalysis, strong oxidative OH is generated in situ, and OH can non-selectively and quickly mineralize toxic and refractory pollutants, or decompose and transform toxic and refractory pollutants into small molecules that are easy to biochemically treat, improving Biodegradability of wastewater. Catalytic ozonation mainly utilizes transition metal ions or oxides, such as MnO 2 、TiO 2 、Al 2...

AI Technical Summary

Problems solved by technology

But this type of device still has the following disadvantages: (1) the energy consumption of rotating the reactor or the packing drum is high, resulting in high operating costs; (2) although the rotating can make the packing turn over, it cannot make the packing in the whole reactor. In a fully fluidized state, the mass transfer efficiency is limited, which is not conducive to the improvement of wastewater treatment efficiency

In addition, the usual Fenton-like reactor needs to add a large amount of acid to maintain a high pollutant removal efficiency, which will also increase the operating cost of the Fenton-like reactor

[0004] Existing catalytic ozonation reactors mainly use the aeration head to introduce ozone into the wastewater, such as the ozone catalytic oxidation water treatment device disclosed in CN104150578A, the bubbles produced by aeration are usually large, and the excessive diameter of the bubbles directly causes The gas-liquid contact area is too small, resulting in a very low utilization rate of ozone in the reactor, and the existing catalytic ozonation reactor does not have the function of ozone recycling. In order to avoid ozone pollution to the environment, a large amount of unused ozone After coming out of the reactor, it needs to be treated with ozone removal

The low utilization rate of ozone not only affects the effect and efficiency of wastewater treatment, but also causes a large consumption of total ozone, increases the cost of wastewater treatment, and causes the cost of ozone removal to be too high

In addition, ozone will corrode and destroy the commonly used rubber-type microporous aerator heads, requiring the use of more expensive titanium alloy aerator heads, which will increase the cost of equipment and is not conducive to the reduction of wastewater treatment costs

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