Study on the Pretreatment of COD in Brewing Wastewater Based on the Ozone Oxidation Technology

Abstract

The high content of COD has always been a difficult problem for the efficient treatment of brewing wastewater. Pretreatment of brewing wastewater to reduce the content of COD was considered as a better solution. In this paper, ozone oxidation technology was used to pretreat brewing wastewater to preliminarily reduce the COD content, so as to provide beneficial conditions for further efficient treatment. The results showed that the reaction temperature (A), ozone intake (B), pH value of reaction solution (C) and reaction time (D) were the main factors affecting the removal of COD from brewing wastewater by ozone oxidation. Combined with the orthogonal test method, the optimum process conditions were A2B3C2D2. It was that the reaction temperature was 50 °C, the ozone intake flow was 7 L/min, the pH value of reaction solution was 7 and the reaction time was 1 h, which made the removal rate of COD reach 40.5%, and realized the goal of pre-removal of COD in brewing wastewater.