PN/A工艺快速实现老龄垃圾渗滤液脱氮中试研究

Rapid Start-up of a Pilot-scale PN-Anammox Process for Nitrogen Removal from Aged Landfill Leachate

以某垃圾填埋场老龄垃圾渗滤液为处理对象,构建了一套前置亚硝化反硝化-部分亚硝化(PN)/厌氧氨氧化(A)工艺的中试系统,探究其对该老龄垃圾渗滤液低碳脱氮处理的快速启动与适用性。结果表明,在已有培养成熟的厌氧氨氧化菌种基础上,该中试系统仅用23 d就达到了15 kg/d的氨氮去除量;通过前置反硝化去除渗滤液中的大部分可生化有机物后,系统对老龄垃圾渗滤液中氨氮、总氮和COD的平均去除率分别可达到95.1%、94.3%、67.9%;经济核算结果表明,该工艺的处理成本(以去除NH_(4)^(+)-N计)仅为9.3元/kg,远低于硝化-反硝化工艺。

This paper constructed a pilot-scale system consisting of pre-nitritation/denitrification,partial nitritation(PN) and Anammox(A),and investigated its rapid start-up and applicability for removing nitrogen in the aged landfill leachate with low organic pollutants concentration from a landfill.Seeded with existing mature Anammox bacteria,the pilot system achieved a removal of 15 kg/d ammonia nitrogen in just 23 days.After pre-denitrification to remove most of the biodegradable organic pollutants in the leachate,the average removal rates of ammonia nitrogen,total nitrogen,and COD from the aged landfill leachate reached 95.1%,94.3% and 67.9% respectively.The economic calculations showed that the treatment cost of this process was only 9.3 yuan/kg,which was significantly lower than that of the nitrification-denitrification process.