School of Urban Construction, Changzhou University, Changzhou 213164, China.
College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China.
Bioresour Technol. 2024 Dec;414:131660. doi: 10.1016/j.biortech.2024.131660. Epub 2024 Oct 17.
Conventional advanced nitrogen removal in municipal wastewater is hindered by the limited availability of carbon sources in the secondary effluent. However, refractory organics present in it had the potential to serve as intrinsic carbon sources after hydrolysis for nitrogen removal via simultaneous denitrification and partial-denitrification anammox (PDA) processes. To assess this potential, a denitrification filter was set up in this study to evaluate its feasibility of concurrent processes. Results showed that increasing influent ammonium (NH-N) from 1.0 to 7.0 mg/L increased total nitrogen (TN) removal from 52.4 % to 89.9 %. Simultaneous occurrence of PDA and denitrification process were confirmed by the actual chemical oxygen demand (COD) consumption (0.8-1.2 mg/mg TN removal) from non-fluorescent organics. The presence of the anammox, hydrolytic and denitrifying bacteria further supported the achievement of nitrogen removal through PDA and denitrification processes by utilizing hydrolytic products biodegraded from refractory organics.
传统的城市污水高级脱氮受到二级出水中有限碳源可用性的限制。然而，其中存在的难生物降解有机物在水解后可能作为内在碳源，通过同步反硝化和部分反硝化厌氧氨氧化（PDA）工艺进行脱氮。为了评估这种潜力，本研究中设置了一个反硝化滤池来评估其同时进行这些过程的可行性。结果表明，将进水氨氮（NH-N）从 1.0 增加到 7.0mg/L 时，总氮（TN）去除率从 52.4%提高到 89.9%。通过非荧光有机物的实际化学需氧量（COD）消耗（0.8-1.2mg/mg TN 去除）证实了 PDA 和反硝化过程的同时发生。厌氧氨氧化菌、水解菌和反硝化菌的存在进一步支持了通过利用难生物降解有机物生物降解产生的水解产物来实现 PDA 和反硝化过程中的氮去除。
