The advanced nitrogen removal of mature landfill leachate (MLL) with low carbon to nitrogen ratio (C/N) is a topic worthy of further research. A two-stage partial nitrification/anammox (PN/A) system for integrated MLL and kitchen waste digestion liquid (KWDL) treatment was established in this study. The nitrogen removal efficiency (NRE) of this process was 98.1 ± 1.3 %, with an effluent TIN concentration of 15.2 ± 1.8 mg/L. In the partial nitrification-sequencing batch reactor (PN-SBR), aerobic hydraulic retention time (HRT) accounted for just 36.4 % of the whole process with dissolved oxygen (DO) < 0.3 mg/L, which significantly reduced energy consumption. Furthermore, the introduction of KWDL heightened anoxic denitrification and aerobic simultaneous nitrification and denitrification (SND) processes, contributing to 74.2 ± 4.3 % and 25.8 ± 4.3 % of the total NRE, respectively. This greatly strengthened the nitrogen removal capacity of PN-SBR. Batch tests indicated that the capacity of KWDL as a carbon source to drive the process of partial denitrification coupled with anammox (PDA) was equal to that of sodium acetate. Adding KWDL in the later phase of each cycle in the anammox-sequencing batch reactor (A-SBR) facilitated achieving stable PDA and advanced nitrogen removal. The nitrate accumulation problem in the traditional two-stage PN/A process has been resolved without the addition of carbon sources. Nitrosomonas (3.7 %→7.9 %), Thauera (0.04 %→40.7 %) and a salt-tolerant AnAOB microbe, unclassified_f_Brocadiaceae (0 %→5.3 %) were dominant in the combined system. This study revealed a pioneering avenue for efficient high-strength wastewater treatment.

中文翻译：

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通过两阶段部分硝化/厌氧氨氧化 (PN/A) 工艺，从集成的成熟垃圾渗滤液和厨余垃圾消化液中实现卓越的脱氮效果


低碳氮比（C/N）的成熟垃圾渗滤液（MLL）的高级脱氮是一个值得进一步研究的课题。本研究建立了一套用于MLL和餐厨垃圾消化液（KWDL）综合处理的两级部分硝化/厌氧氨氧化（PN/A）系统。该工艺的脱氮效率（NRE）为98.1±1.3%，出水TIN浓度为15.2±1.8mg/L。在部分硝化-序批式反应器（PN-SBR）中，好氧水力停留时间（HRT）仅占整个过程的36.4%，溶解氧（DO）< 0.3 mg/L，显着降低了能耗。此外，KWDL 的引入增强了缺氧反硝化和好氧同步硝化反硝化 (SND) 工艺，分别占总 NRE 的 74.2 ± 4.3 % 和 25.8 ± 4.3 %。这大大增强了PN-SBR的脱氮能力。批量试验表明，KWDL作为碳源驱动厌氧氨氧化耦合部分反硝化（PDA）过程的能力与乙酸钠相当。在厌氧氨氧化序批式反应器 (A-SBR) 的每个循环的后期添加 KWDL 有助于实现稳定的 PDA 和先进的脱氮。在不添加碳源的情况下，解决了传统两级PN/A工艺中硝酸盐积累问题。亚硝化单胞菌 (3.7 %→7.9 %)、Thauera (0.04 %→40.7 %) 和耐盐 AnAOB 微生物、unclassified_f_Brocadiaceae (0 %→5.3 %) 在组合系统中占主导地位。这项研究揭示了高效高浓度废水处理的开创性途径。