Due to highly recalcitrant nature of 1H-1,2,4-triazole (TZ), the conventional biological process is quite ineffective for TZ removal from wastewater. In this study, co-metabolic enhancement of TZ biodegradation through nitrification was investigated in an activated sludge reactor. The link between enhanced TZ degradation and nitrification was established through highly efficient removal of TZ, TOC as well as dissolved organic matter with the supplement of NH₄⁺. A new co-metabolic degradation pathway of TZ was proposed based on the identification of five co-metabolic intermediates, including 2,4-dihydro-[1,2,4]triazol-3-one and [1,2,4]triazolidine-3,5-dione. High-throughput sequencing analysis suggested the significant improvement of microbial community in the co-metabolic system in terms of richness, abundance and uniformity. Functional species related to nitrification and biodegradation was enriched with the supplement of NH₄⁺, confirming the key role of nitrification. This study demonstrated that nitrification-assisted co-metabolism had a promising potential for the removal of recalcitrant contaminants such as TZ from wastewater.

由于1H-1,2,4-三唑（TZ）的顽强抗性，常规生物工艺对于去除废水中的TZ效果不佳。在这项研究中，在活性污泥反应器中研究了通过硝化作用协同代谢促进TZ生物降解的过程。通过高效去除TZ，TOC以及添加NH ₄ ^+的溶解有机物，可以建立增强的TZ降解与硝化之间的联系。。在鉴定5种共代谢中间体的基础上，提出了一种新的TZ共代谢降解途径，包括2,4-二氢-[1,2,4]三唑-3-酮和[1,2,4]三唑烷-3,5-二酮 高通量测序分析表明，共代谢系统中微生物群落的丰富度，丰度和均匀性均得到显着改善。硝化和生物降解相关的功能性物种丰富了NH ₄ ⁺的补充，证实了硝化的关键作用。这项研究表明，硝化辅助的协同代谢具有从废水中去除顽固污染物（例如TZ）的潜力。