The study demonstrated a novel anammox-like process to remove high-concentration ammonium using nitrate as terminal electron acceptor under Fe(III)/Fe(II) cycle. Compared with NO₂⁻ in common anammox, NO₃⁻ used here is more available in practice, suitable for in-situ removal of high-concentration NH₄⁺ in a single anaerobic system. The NO_x⁻ and Fe(II) produced from Feammox [Fe(III) reduction coupled to anaerobic ammonium oxidation] subsequently react together via NO_x⁻-dependent Fe(II) oxidation to regenerate Fe(III) that potentially stimulates next round of Feammox. However, these processes couldn't be lasting due to inadequate Fe(III) regeneration because NO_x⁻ is non-dominant product during Feammox. In this study NO₃⁻ was added to supplement the insufficient NO_x⁻ to enhance Fe(III) regeneration and remove nitrogen successively. Results showed that periodically adding nitrate caused oscillations between Fe(III) and Fe(II) in the sludge, implying Fe(III) regeneration and consumption. Consequently, nitrogen removal of the digester with an initial total nitrogen of 1036.7 mg/L reached 90.1% after 98-day operation, much higher than that of control (41.6%) without NO₃⁻ addition. Adding NO₃⁻ in the digester to trigger Fe(III)/Fe(II) cycle for removing ammonium is just equivalent to an anammox-like process using NO₃⁻ as terminal electron acceptor to oxidize NH₄⁺.

这项研究证明了在Fe（III）/ Fe（II）循环下，使用硝酸盐作为末端电子受体的新型厌氧菌样工艺可以去除高浓度铵。与NO相比₂ ^-在共同厌氧氨氧化，NO ₃ ^-这里使用在实践中是多个可用，适合用于原位除去高浓度的NH ₄ ⁺中的单个的厌氧系统。使NO _X ^-和从Feammox的[Fe（III）还原耦合到厌氧性氨氧化]制备的Fe（II）随后一起反应通过NO _X ^-依赖的Fe（II）氧化来再生Fe（III），这可能刺激下一轮Feammox。然而，这些方法不能持久由于铁（III）再生不够的，因为NO _X ^-是Feammox在非主导产品。在这项研究中NO ₃ ^-的溶液中加入以补充不足NO _X ^-依次以提高的Fe（III）再生和去除氮气。结果表明，定期添加硝酸盐会导致污泥中的Fe（III）和Fe（II）之间发生振荡，这意味着Fe（III）的再生​​和消耗。因此，在运行98天后，最初的总氮为1036.7 mg / L的消化池的氮去除率达到90.1％，远高于没有NO ₃的对照（41.6％）。⁻加法。加入NO ₃ ^-在蒸煮至触发器的Fe（III）/ Fe的（II）循环用于除去铵使用NO只是相当于一个厌氧氨氧化类似过程₃ ^-作为末端电子受体氧化NH ₄ ⁺。