Electrochemical-multiphase ozone catalysis system and method for gas-water co-treatment

Abstract

The invention provides an electrochemical-heterogeneous ozone catalysis system and method for gas-water co-treatment. The system is composed of an oxygen generator, an ozone generator, a gas-water co-processing device and an oxygen recycling device. And the gas-water co-treatment device is formed by sequentially connecting three stages of electrochemical-ozone catalytic reactors in series. The oxygen recycling device is composed of an electrochemical system filled with hydrophobic carbon particle filler. By constructing the gas-water cooperative treatment device, efficient treatment of refractory organics can be achieved, meanwhile, all ozone tail gas is cooperatively utilized and treated, final oxygen tail gas is efficiently converted into H2O2 to be recycled to the water inlet end through the oxygen recovery device, ozone / H2O2 efficient homogeneous catalysis at the water inlet end is achieved, the water inlet load is reduced, and the decontamination performance of the system is improved. Finally, the problems of ozone tail gas emission, secondary pollution, oxygen waste and unbalanced wastewater-ozone supply and demand in the traditional ozone catalysis process are efficiently solved.

Description

technical field [0001] The invention relates to the fields of sewage treatment and waste gas treatment, in particular to an electrochemical-heterogeneous ozone catalysis system and method for co-processing gas and water. Background technique [0002] Ozone is widely used in industrial wastewater and other fields due to its high-efficiency oxidation characteristics and no drug residues. However, the existing ozone water treatment methods all have key problems such as low utilization rate of ozone gas and a large amount of ozone tail gas in the actual application process. On the one hand, the oxidation potential of ozone is wasted, and the sustainability of ozone water treatment technology is reduced. develop ability. For the ozone tail gas generated in the process of ozone water treatment, the existing treatment method is mainly to install an ozone quenching device, and convert ozone into oxygen through a catalytic filler supported by metal oxides and finally discharge it in...

AI Technical Summary

Problems solved by technology

However, in the previous methods, on the one hand, the ozone quenching wasted its oxidation potential, and the ozone tail gas treatment did not cooperate efficiently with the wastewater treatment.

Although the CN106335998B patent previously authorized by the applicant proposed an electrochemical-multiphase ozone catalytic system based on porous titanium aeration electrodes, it did not effectively solve the problem of ozone tail gas discharged from the system, the problem of advanced wastewater treatment and the balance between supply and demand of ozone

More importantly, although the proposed electrochemical-ozone catalytic reactor can utilize the carbon-coated cathode to in situ reduce the oxygen in the ozone / oxygen mixture to generate H 2 o 2 , used to catalyze ozone in situ to generate reactive oxygen species, but the large amount of oxygen in the tail gas is not fully recycled, resulting in a waste of oxygen resources

Images