丁二烯法尼龙66盐生产废水深度处理工程实例

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

针对某企业丁二烯法尼龙66盐生产废水生化出水,研发特定的臭氧催化剂,采用高效沉淀+前臭氧催化氧化+两级前置反硝化+后臭氧催化氧化处理工艺进行深度处理。运行结果表明,系统处理效果稳定,出水COD≤40 mg/L、氨氮≤2 mg/L、总氮≤5 mg/L,远优于《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A排放标准。生化池细菌培养期间,后臭氧催化氧化池对于氨氮、总氮平均去除率分别为81.1%、63.7%,表现出优异的同步去除氨氮、总氮性能,前臭氧催化氧化池对COD去除效果较好,平均臭氧消耗量与COD去除量的质量比为1.64∶1。高效沉淀+前臭氧催化氧化+两级前置反硝化+后臭氧催化氧化处理工艺处理丁二烯法尼龙66盐生产废水吨水运行成本4.86元,具有较好的经济性,为类似行业废水处理提供参考。

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 oxida⁃tion+two-stage pre-denitrification+post-ozone catalytic oxidation was introduced.The results showed that the treat⁃ment effect of the whole process was in a relatively stable condition.The effluent with COD≤40 mg/L,NH_(3)-N≤2 mg/L,and TN≤5 mg/L was better than first class A effluent index of Pollutant Emission Standards for Urban Sewage Treat⁃ment Plants(GB 18918-2002).In the process of bacterial culture,post-ozone catalytic oxidation had NH_(3)-N removal rate of 81.1%and TN removal rate of 63.7%,showing great performance in NH_(3)-N and TN removal.Meanwhile,preozone 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 pro⁃ducted 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.