炼油催化剂废水短程硝化反硝化脱氮技术研究

随着国家对环境保护的重视,炼化行业废水排放标准也在逐步升级,《石油炼制工业污染物排放标准》(GB 31570-2015)首次对石化行业总氮排放限值提出了要求,并于2017年7月1日起正式实施。对于炼油催化剂废水,由于其低C/N比,低成本总氮(TN)脱除是其难题。本文以催化剂生产废水为研究对象,结合该废水高含盐、低C/N比的特点,在SBR反应器内采用实时控制的方式,采用短程硝化反硝化脱氮技术对模拟催化剂废水进行实验研究。实验结果表明:在实时控制条件下,低C/N比的含盐催化剂废水稳定运行时NH4+-N和TNN(TNN为亚硝酸盐和硝酸盐之和)去除率分别达到96.9%和99.8%,硝化出水亚硝酸盐积累率NAR平均为98.1%,同时反硝化阶段对碳源需求:醋酸钠(Na Ac)/TNN为3.1∶1,节省了大量碳源。

Research on Short-cut Nitrification and Denitrification Nitrogen Removal Technology for Treating Wastewater From Refinery Catalyst Production

With the country's emphasis on environmental protection, wastewater discharge standards of refining industry are gradually being upgraded.Emission standard of pollutants for petroleum refining industry(GB 31570-2015)first put forward higher demands on total nitrogen emission limit to petrochemical industry, which has been implemented since July 1, 2017. For wastewater from refinery catalyst production, the removal of total nitrogen (TN) with lower cost is a difficult problem we are facing today because of its low C/N. In this paper, taking wastewater from refinery catalyst production as a research object, based on high salinity and low C/N characteristics of the wastewater, SBR reactor was used to carry out short range nitrification denitrification technology experiment on the wastewater under real-time control. The result showed that NH4+-N and TNN removal rates respectively reached 96.9% and 99.8% under the real-time control, while the nitrite accumulation rate (NAR) was 98.1%. At the same time, the demand for carbon source in the denitrification stage,NaAc/TNN was 3.1:1.