Biological nitrogen removal of wastewater with low COD/N ratio could be enhanced by the addition of wasted sludge fermentation liquid (SFL), but the performance is usually limited by the introducing ammonium. In this study, the process of using SFL was successfully improved by involving anammox process. Real municipal wastewater with a low C/N ratio of 2.8–3.4 was treated in a sequencing batch reactor (SBR). The SBR was operated under anaerobic-aerobic-anoxic (AOA) mode and excess SFL was added into the anoxic phase. Stable short-cut nitrification was achieved after 46d and then anammox sludge was inoculated. In the stable period, effluent total inorganic nitrogen (TIN) was less than 4.3 mg/L with removal efficiency of 92.3%. Further analysis suggests that anammox bacteria, mainly affiliated with Candidatus_Kuenenia, successfully reduced the external ammonia from the SFL and contributed approximately 28%–43% to TIN removal. Overall, this study suggests anammox could be combined with SFL addition, resulting in a stable enhanced nitrogen biological removal.

通过添加废污泥发酵液（SFL）可以提高低COD / N比废水的生物脱氮能力，但是其性能通常受到引入铵的限制。在这项研究中，通过涉及厌氧氨氧化工艺成功地改善了SFL的使用过程。在顺序批处理反应器（SBR）中处理了具有低C / N比2.8-3.4的实际市政废水。SBR在厌氧-好氧-缺氧（AOA）模式下运行，并将过量的SFL添加到缺氧相中。46d后达到稳定的短程硝化，然后接种厌氧氨氧化污泥。在稳定期，出水总无机氮（TIN）小于4.3 mg / L，去除率为92.3％。进一步分析表明，厌氧氨氧化菌，主要隶属于Candidatus_Kuenenia，成功地减少了SFL中的外部氨，对TIN的去除贡献了大约28％–43％。总的来说，这项研究表明厌氧氨氮可以与SFL的添加结合使用，从而稳定地提高氮的生物去除率。