Gas-water circulation ozone catalytic oxidation sewage treatment device

Abstract

The invention discloses a gas-water circulation ozone catalytic oxidation sewage treatment device which comprises a reaction tower and a water inlet pipe entering the reaction tower through the lower part of the reaction tower, a water inlet jet pump and an ozone adding jet device are sequentially arranged on the water inlet pipe outside the reaction tower along the sewage inlet direction, the ozone adding jet device is also communicated with an ozone adding pipe, and an ozone mixing aeration head is arranged at the end part of the water inlet pipe; the ozone mixing aeration head is arranged in the reaction tower, an ozone catalytic bed layer is arranged at the upper part of the ozone mixing aeration head in the reaction tower, a plurality of water vapor circulating aeration heads are arranged in the ozone catalytic bed layer, the plurality of water vapor circulating aeration heads are simultaneously connected with a sewage circulating pipe extending to the outside of the reaction tower, the sewage circulating pipe extends upwards and is communicated with sewage in the upper part of the catalytic bed layer, and the sewage circulating pipe is also provided with an ozone circulating jet device. The gas-water circulation ozone catalytic oxidation sewage treatment device can reduce dead zones of a catalytic bed layer, increase contact between a catalyst and ozone and improve the utilization rate of the ozone.

Description

technical field [0001] The invention relates to the field of water pollution purification, in particular to an ozone catalytic oxidation sewage treatment device with air-water circulation. Background technique [0002] Ozone is a common oxidant, which will be converted into non-toxic oxygen after reacting with reducing substances, and has no secondary pollution. Therefore, the ozone oxidation process is widely used in the fields of organic wastewater treatment and tap water pretreatment. Among them, the ozone catalytic oxidation process has the highest efficiency. [0003] At present, the reaction pools used in ozone catalytic oxidation engineering are generally in the form of fixed beds, and the catalysts used are mainly high-density metal oxide pellets or carrier catalysts. The sewage is easy to form channels and dead zones in the fixed bed. A small amount of catalyst can be in contact with sewage and ozone, so that the catalytic effect of the fixed bed is not significan...

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Problems solved by technology

[0003] At present, the reaction pools used in ozone catalytic oxidation projects are generally in the form of fixed beds, and the catalysts used are mainly high-density metal oxide pellets or carrier catalysts. Channels and dead zones are easy to form in the fixed beds, and only A small amount of catalyst can contact with sewage and ozone, so that the catalytic effect of the fixed bed is not significant

On the other hand, the rising speed of ozone gas in water is relatively high, and a considerable part of ozone is discharged to the ozone destroyer without being utilized, resulting in low ozone utilization rate and increased operating costs

In addition, fixed bed catalysts are easily covered by hardness ions in water, resulting in scaling and affecting catalytic activity. Therefore, it is necessary to add a backwash device, and the installation of the backwash device increases the investment cost. At the same time, the shutdown of the backwash process will affect the quality of the effluent

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