高硬度高氨氮煤制氢污水处理技术的工业应用

COMMERCIAL APPLICATION OF HIGH HARDNESS AND AMMONIA NITROGEN WASTEWATER TREATMENT TECHNOLOGY FOR COAL GASIFICATION

解决煤制氢产生的高硬度高氨氮污水达标处理对煤化工发展具有重要意义。针对煤制氢工艺产生的高硬度、高氨氮污水特性,采用化学除硬+生物脱碳除氮组合工艺建设的工程装置,成功实现了工业化运行,经过优化调试后的结果表明:化学需氧量(COD)、氨氮和总氮的平均去除率分别达到90.8%,98.5%,95.1%,水质全部达到国家标准GB 31570—2015《石油炼制工业污染物排放标准》中特别排放限值要求,并实现了设计水量140%负荷长周期稳定运行,为同类污水处理提供了借鉴经验。

It is of great significance for the development of coal chemical industry to solve the standard treatment of high hardness and high ammonia nitrogen wastewater produced from coal gasification for hydrogen production.According to the characteristics of sewage,the combined process of chemical hardness reduction with biological decarbonization and nitrogen removal was adopted in a refinery.The results of unit running indicated that the average removal rates of COD,ammonia nitrogen,total nitrogen were stable over 90.8%,98.5%,92.9%,respectively,which could meet the requirement of special discharge limit in the national standard“Emission standard of pollutants for petroleum refining industry(GB 31570—2015)”.The long-term stable operation of the designed water load of 140%has been realized.