National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China.
SDIC Xinkai Water Environment Investment Co., Ltd, China Water Environment Group Ltd, Beijing, China.
Sci Total Environ. 2022 Apr 1;815:152835. doi: 10.1016/j.scitotenv.2021.152835. Epub 2022 Jan 5.
Anammox process is a cost-effective solution for nitrogen removal, whereas unsatisfactory effluent with nitrate accumulation is usually achieved in treating domestic sewage, owning to the unwanted prevalence of nitrite-oxidizing bacteria (NOB) and the intrinsic nitrate production by anammox bacteria. Herein, a pilot-scale system integrating Partial Nitritation and simultaneous Anammox, Denitrification and Sludge Fermentation (PN + ADSF) process was developed to treat real municipal wastewater. In this process, PN was accomplished in a sequencing batch reactor (SBR) using the strategy of intermittent hydroxylamine addition, while ADSF coupling anammox and heterotrophic denitrification was conducted in an up-flow anaerobic sludge blanket reactor (UASB) to further remove nitrogen. The pilot-scale system achieved total inorganic nitrogen (TIN) concentrations of 10.0 mg N/L in effluent and sludge reduction efficiency of 42.3% simultaneously. The characterization on microbial communities revealed that Candidatus Kuenenia and Thauera were the dominant functional bacteria for anammox and denitrification, respectively. Supported by the slow-release carbon sources from sludge fermentation, heterotrophic denitrification contributed to about 28% of nitrogen removed from the UASB, while anammox played a more important role in nitrogen removal. The pilot-scale demonstration confirmed that the PN + ADSF process is technically feasible for enhanced nitrogen removal and sludge reduction.
厌氧氨氧化工艺是一种经济有效的脱氮解决方案，但在处理生活污水时，由于亚硝酸盐氧化菌（NOB）的不受欢迎的流行和厌氧氨氧化菌的内在硝酸盐生产，通常会得到硝酸盐积累的不理想出水。在此，开发了一种集成部分亚硝化和同时厌氧氨氧化、反硝化和污泥发酵（PN + ADSF）工艺的中试系统，以处理实际城市污水。在该工艺中，PN 在序批式反应器（SBR）中完成，使用间歇添加羟胺的策略，而 ADSF 将厌氧氨氧化和异养反硝化耦合在升流式厌氧污泥床反应器（UASB）中进行，以进一步去除氮。中试系统同时实现了出水总无机氮（TIN）浓度为 10.0mgN/L 和污泥减少效率为 42.3%。微生物群落的特征表明，Candidatus Kuenenia 和 Thauera 分别是厌氧氨氧化和反硝化的主要功能细菌。在污泥发酵提供的缓慢释放碳源的支持下，异养反硝化对 UASB 中去除的氮约贡献了 28%，而厌氧氨氧化在氮去除中起着更重要的作用。中试示范证实，PN + ADSF 工艺在强化脱氮和减少污泥方面具有技术可行性。
