Stable nitritation for low-strength ammonium wastewater was the key obstacle for cost-effective and low-carbon biological nitrogen removal. A zeolite biological fixed bed (ZBFB) and an anoxic sequencing batch reactor (ASBR) were successfully applied for achieving nitritation-denitrification of low-strength ammonium wastewater by adsorption, biological desorption and denitrification. Based on free ammonia inhibition on biofilm, stable nitrite accumulation could be realized with suitable operational time and aeration in biological desorption. During cycle operation, adsorption effluent NH₄⁺-N kept at 3.0–4.0 mg/L, biological desorption effluent NO₂⁻-N maintained at 226.8–243.2 mg/L with average nitrite accumulation ratio of 97.18%, and nitrite removal rate was about 0.628–0.672 kg NO₂⁻-N·m⁻³·day⁻¹, revealing obvious feasibility of ZBFB and ASBR for low-strength ammonium wastewater treatment. High-throughput sequencing analysis results further presented significant microbial community variations happened after cycle operation, with ammonia oxidizing bacteria enrichment and nitrite oxidizing bacteria inhibition in ZBFB and dominance of denitrifiers in ASBR.

低强度铵废水的稳定硝化是经济高效的低碳生物脱氮的主要障碍。沸石生物固定床（ZBFB）和缺氧顺序分批反应器（ASBR）成功地用于吸附，生物解吸和反硝化作用实现低强度铵废水的硝化-硝化。基于游离氨对生物膜的抑制作用，可以在适当的操作时间和曝气条件下实现稳定的亚硝酸盐积累。在周期操作中，吸附流出物NH ₄ ⁺ -N保持在3.0-4.0毫克/升，生物解吸流出物NO ₂ ^--N维持在226.8–243.2 mg / L，平均亚硝酸盐积累率为97.18％，亚硝酸盐去除率约为0.628–0.672 kg NO ₂ ^-- N·m ^-3 ·day ^-1，显示ZBFB和ASBR的明显可行性用于低强度铵废水的处理。高通量测序分析结果进一步表明，循环操作后微生物群落发生了显着变化，ZBFB中氨氧化细菌的富集和亚硝酸盐氧化细菌的抑制以及ASBR中反硝化剂的优势。