Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt; Civil Engineering Department, Faculty of Engineering, Delta University for Science and Technology, Gamasa, Egypt.
Public Works Engineering Department, Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt.
Sci Total Environ. 2022 Aug 10;833:155247. doi: 10.1016/j.scitotenv.2022.155247. Epub 2022 Apr 13.
A novel aerobic-anoxic baffled reactor is designed for the effective denitrification of real domestic wastewater without an external carbon source. The flow is divided between two inlets at the beginning of each zone to provide a carbon source for the denitrifying bacteria. The effects of operating parameters such as the ratio of chemical oxygen demand to nitrogen (COD/N), flow division ratio, and hydraulic retention time (HRT) on the nitrogen removal were investigated. The optimum values of COD/N and HRT were estimated using response surface methodology (RSM) coupled with a central composite experimental design. The addition of porous biomass support media considerably improved the denitrification and removal of COD. Furthermore, the aerobic-anoxic system showed high stability against sudden HRT and COD/N ratio changes. The microbial analysis showed that Alcaligenes, Achromobacter, and Bordetella were the dominant denitrifying bacteria in the anoxic zone, whereas other species coexisted in the aerobic zone.
一种新型的好氧-缺氧折流板反应器被设计用于在没有外加碳源的情况下有效去除实际生活污水中的硝酸盐。在每个区域的起始处将水流分为两个入口，为反硝化细菌提供碳源。考察了操作参数（化学需氧量与氮的比值（COD/N）、流量分配比和水力停留时间（HRT））对脱氮效果的影响。采用响应面法（RSM）结合中心复合实验设计对 COD/N 和 HRT 的最佳值进行了估算。添加多孔生物载体显著提高了反硝化和 COD 的去除率。此外，好氧-缺氧系统对 HRT 和 COD/N 比的突然变化表现出较高的稳定性。微生物分析表明，在缺氧区，产碱杆菌属、无色杆菌属和博德特氏菌属是主要的反硝化细菌，而其他物种则在好氧区共存。
