An advanced treatment project of wastewater from PA66 salt producted by butadiene process

Abstract

To make advanced treatment of wastewater from butadiene-based PA66 salt production, the research of ozone catalyst was conducted, and a combined process of high-efficiency sedimentation+pre-ozone catalytic oxidation+two-stage pre-denitrification+post-ozone catalytic oxidation was introduced. The results showed that the treatment effect of the whole process was in a relatively stable condition. The effluent with COD≤40 mg/L, NH3-N≤2 mg/L, and TN≤5 mg/L was better than first class A effluent index of Pollutant Emission Standards for Urban Sewage Treatment Plants(GB 18918-2002). In the process of bacterial culture, post-ozone catalytic oxidation had NH3-N removal rate of 81.1% and TN removal rate of 63.7%, showing great performance in NH3-N and TN removal. Meanwhile, pre-ozone catalytic oxidation had a better performance in COD removal, and the mass ratio between ozone consumption and COD removal was 1.64∶1. The operating cost of the whole process for treating wastewater from PA66 salt producted by butadiene was 4.86 yuan/t. The whole process was cost-effective compared to deep treatment project. It provides reference for similar wastewater treatment.

Keywords

• butadiene
• pa66
• advanced treatment
• ozone catalytic oxidation