Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Bioresour Technol. 2018 May;255:58-66. doi: 10.1016/j.biortech.2018.01.080. Epub 2018 Jan 31.
A Coupled Aerobic-anoxic Nitrous Decomposition Operation (CANDO) was performed over five months to investigate the performance and dynamics of nitrogen elimination and nitrous oxide production from digester reject water under real feed-stream conditions. A 93% conversion of ammonium to nitrite could be maintained for adapted seed sludge in the first stage (nitritation). The second stage (nitrous denitritation), inoculated with conventional activated sludge, achieved a conversion of 70% of nitrite to nitrous oxide after only 12 cycles of operation. The development of an alternative feeding strategy and the addition of a coagulant (FeCl) facilitated stable operation and process intensification. Under steady-state conditions, nitrite was reliably eliminated and different nitrous oxide harvesting strategies were assessed. Applying continuous removal increased NO yields by 16% compared to the application of a dedicated stripping phase. These results demonstrate the feasible application of the CANDO process for nitrogen removal and energy recovery from ammonia rich wastewater.
采用好氧-缺氧亚硝氮反硝化耦合（CANDO）运行五个月，以考察在实际进水条件下，从消化 reject water 中去除氮和产生氧化亚氮的性能和动力学。适应后的种子污泥在第一阶段（硝化）中可将铵盐 93%转化为亚硝酸盐。接种传统活性污泥的第二阶段（亚硝氮反硝化）在仅运行 12 个周期后，将 70%的亚硝酸盐转化为氧化亚氮。开发替代进料策略和添加混凝剂（FeCl）有助于稳定运行和强化过程。在稳定状态下，可靠地去除了亚硝酸盐，并评估了不同的氧化亚氮收获策略。与专用吹脱阶段相比，连续去除可将 NO 产量提高 16%。这些结果表明，CANDO 工艺可从富氨废水中去除氮并回收能源。
