National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
Bioresour Technol. 2024 Jan;391(Pt A):129968. doi: 10.1016/j.biortech.2023.129968. Epub 2023 Nov 3.
Introducing carbon sources to achieve nitrogen removal from mature landfill leachate not only increases the costs and carbon emissions but also inhibits the activity of autotrophic bacteria. Thus, this study constructed a double anammox system that combines partial nitrification-anammox (PNA) and endogenous partial denitrification-anammox (EPDA) within an integrated fixed-film activated sludge (IFAS) reactor. In this system, PNA primarily contributes to nitrogen removal pathways, achieving a nitrite accumulation rate of 98.23%. The production of extracellular polymer substances (EPS) in the IFAS reactor is stimulated by introducing co-fermentation liquid. Through the utilization of EPS, the system effectively achieves EPDA with the nitrite transformation rate of 97.20%. Under the intermittent aeration operation strategy, EPDA combined with PNA and anammox in the oxic and anoxic stages enhanced the nitrogen removal efficiency of the system to 99.70 ± 0.12%. The functional genus Candidatus kuenenia became enriched in biofilm sludge, while Thauera and Nitrosomonas predominated in floc sludge.
向成熟垃圾渗滤液中引入碳源不仅会增加成本和碳排放，还会抑制自养细菌的活性，从而实现脱氮。因此，本研究构建了一种双厌氧氨氧化系统，该系统将部分硝化-厌氧氨氧化（PNA）和内源性部分反硝化-厌氧氨氧化（EPDA）结合在一个集成固定膜活性污泥（IFAS）反应器中。在该系统中，PNA 主要贡献于脱氮途径，实现了 98.23%的亚硝酸盐积累率。通过引入共发酵液，IFAS 反应器中的胞外聚合物物质（EPS）的产生受到刺激。通过利用 EPS，该系统有效地实现了 EPDA，其亚硝酸盐转化率为 97.20%。在间歇曝气操作策略下，EPDA 与好氧和缺氧阶段的 PNA 和厌氧氨氧化相结合，提高了系统的脱氮效率，达到 99.70±0.12%。生物膜污泥中优势属为 Candidatus kuenenia，絮体污泥中优势属为 Thauera 和 Nitrosomonas。
