Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore; Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Water Res. 2018 Jul 1;138:1-6. doi: 10.1016/j.watres.2018.02.051. Epub 2018 Feb 21.
The conventional biological processes for municipal wastewater are facing the challenges of high energy consumption and production of excessive sludge. To address these two emerging issues, this study demonstrated the feasibility to integrate mainstream anammox into an A-2B process for municipal wastewater treatment towards energy-efficient operation with reduced sludge production. In the proposed A-2B process, an anaerobic fixed bed reactor (AFBR) served as A-stage for COD capture, an anammox moving bed biofilm reactor (MBBR) was employed as B2-stage, which received effluent containing nitrite from a sequencing batch reactor (SBR) at B1-stage. The results showed that under the operation conditions studied, 58% of influent COD was converted methane gas at A-stage, and 87% total inorganic nitrogen (TIN) removal was achieved with the effluent TIN concentration of 6.5 mg/L. Moreover, it was shown that at least 75% of sludge reduction was obtained due to the COD capture at A-stage. The high-throughput sequencing analysis further revealed that Candidatus Kuenenia was the dominant genus responsible for the observed anammox at B2-stage MBBR. This study clearly demonstrated a novel process configuration for sustaining mainstream anammox for municipal wastewater reclamation towards energy-efficient operation with minimized sludge production.
传统的城市污水生物处理工艺面临着高能耗和产生过多剩余污泥的挑战。为了解决这两个新出现的问题，本研究展示了将主流厌氧氨氧化集成到 A-2B 工艺中处理城市污水的可行性，以实现节能运行和减少剩余污泥产量。在提出的 A-2B 工艺中，厌氧固定床反应器（AFBR）作为 A 阶段用于 COD 捕集，厌氧氨氧化移动床生物膜反应器（MBBR）作为 B2 阶段，接收来自 SBR 的 B1 阶段含有亚硝酸盐的出水。结果表明，在研究的操作条件下，58%的进水 COD 在 A 阶段转化为甲烷气体，87%的总无机氮（TIN）去除率，出水 TIN 浓度为 6.5mg/L。此外，由于 A 阶段的 COD 捕集，至少获得了 75%的污泥减少。高通量测序分析进一步表明，Candidatus Kuenenia 是 B2 阶段 MBBR 中观察到的厌氧氨氧化的主要属。本研究清楚地展示了一种新型的工艺配置，用于维持城市污水再生的主流厌氧氨氧化，以实现节能运行和最小化剩余污泥产量。
