Research on the preparation of special ozone catalysts and treatment of coal chemical biochemical effluent with it

Abstract

In order to efficiently remove organic compounds from the biochemical effluent of coal chemical industry，a heterogeneous ozone catalyst was prepared by impregnation method for catalytic ozonation treatment of biochemical effluent of coal chemical industry. Firstly，taking simulated wastewater as the treatment object，the effect factors such as catalyst carrier type，active component type and ratio，impregnation time，calcination temperature，and calcination time on the catalytic ozonation effect of the catalyst were analyzed. The optimal ozone catalyst component and preparation process were determined. Then，the physical properties of the catalyst prepared under optimized conditions，including the apparent morphology，microstructure，and composition of the catalyst were analyzed. Finally，the stability evaluation of the catalyst was carried out using actual biochemical effluent. The results showed that using the impregnation method，under the conditions of impregnation time of 24 hours，calcination temperature of 550 ℃，and calcination time of 5 hours，the γ-Al2O3 as the carrier and n（Mn）∶n（Fe）∶n（Cu）=2∶1∶1 as the active component distribution ratio could get the catalyst，which had better catalytic ozonation performance. Under experimental conditions，it was used to catalyze the ozonation treatment of refractory organic compounds in simulated wastewater，with a COD removal rate of up to 64.6%. The prepared catalyst had a high specific surface area and mesopores. When used in pilot scale treatment of actual coal chemical biochemical effluent，the catalyst structure and the application effect were stable. The operating cost per ton of water was 4.57 yuan.

Keywords

• biochemical effluent
• ozone catalyst
• preparation process
• characterization of physical properties
• stability
• metal dissolution rate