Environ Technol. 2014 May-Jun;35(9-12):1110-20. doi: 10.1080/09593330.2013.861872.
This paper presents the operational strategy for nitrogen removal in a two-stage, partial nitrification (PN) process coupled with anaerobic ammonium oxidation (Anammox) process. The process was used to remove ammonium from centrate obtained from a full-scale, wastewater treatment plant in British Columbia, Canada. The PN, which was carried out in a sequencing batch reactor (SBR), successfully converted approximately 49.5 +/- 1.0% of ammonium to nitrite. The operation of SBR under higher dissolved oxygen in combination with slow feeding resulted in significant reduced HRT without nitrate accumulation. Partially nitrified centrate was further treated in Anammox reactors, where the mixture of ammonium and nitrite was converted mainly to nitrogen gas. Anammox treatment was carried out in two different types of Anammox reactors: a moving bed hybrid reactor and an up-flow fixed-bed biofilm reactor. The hybrid Anammox reactor removed an average of 55.8% of NH4-N, versus the 48.3% NH4-N removed in the up-flow fixed-bed reactor. Nitrite removal in the hybrid and up-flow fixed-bed Anammox reactors averaged 80.8% and 62.5%, respectively. This study also illustrated that in both Anammox reactors, better ammonium removal was achieved when the nitrite to ammonium ratio is between 1.35 and 1.45. As such, alkalinity was found to neither control nor limit the Anammox reaction.
本文提出了两段式部分硝化（PN）工艺与厌氧氨氧化（Anammox）工艺耦合的脱氮运行策略。该工艺用于去除加拿大不列颠哥伦比亚省一个全规模污水处理厂的浓缩液中的氨氮。PN 在序批式反应器（SBR）中进行，成功地将约 49.5±1.0%的氨氮转化为亚硝酸盐。SBR 在高溶解氧条件下运行并采用缓慢进料，可在不积累硝酸盐的情况下显著缩短 HRT。部分硝化的浓缩液进一步在 Anammox 反应器中处理，其中氨氮和亚硝酸盐混合物主要转化为氮气。Anammox 处理在两种不同类型的 Anammox 反应器中进行：移动床混合反应器和上流式固定床生物膜反应器。混合 Anammox 反应器平均去除了 55.8%的 NH4-N，而在上流式固定床反应器中则去除了 48.3%的 NH4-N。混合和上流式固定床 Anammox 反应器中亚硝酸盐的去除率分别平均为 80.8%和 62.5%。本研究还表明，在两种 Anammox 反应器中，当亚硝酸盐与氨氮的比值在 1.35 到 1.45 之间时，氨氮的去除效果更好。因此，碱度既不控制也不限制 Anammox 反应。
