铁氨氧化污泥的驯化及其同步脱氮除磷效果

Acclimation of Feammox Sludge and Its Simultaneous Removal of Nitrogen and Phosphorus

铁氨氧化是一种铁依赖型厌氧氨氧化技术,同时铁也是一种常规的除磷材料,有望基于铁氨氧化开发一种厌氧同步脱氮除磷的新技术。基于此,开展了铁氨氧化污泥的驯化及其同步脱氮除磷效果研究。与厌氧污泥相比,厌氧氨氧化污泥更适合作为接种污泥,以厌氧氨氧化污泥接种,在连续流反应器中成功实现低碳氮比污水的同步脱氮除磷。在稳定运行阶段,氨氮去除率在40%~60%之间,且去除的氨氮中72%转化为N2;磷去除率约为40%。亚铁生成和氨氮的氧化证实了铁氨氧化作用,同时生成的亚铁促进了蓝铁矿的形成。这表明除了铁盐除磷外,蓝铁矿结晶也是除磷的重要途径。

Feammox,an iron‑dependent anaerobic ammonium oxidation(Anammox),might be developed as a novel anaerobic technology for simultaneous removal of nitrogen and phosphorus because ferric salts are commonly used chemicals for phosphate removal.Based on this hypothesis,the acclimation of Feammox sludge and its simultaneous removal of nitrogen and phosphorus were investigated.Compared with anaerobic digestion sludge,Anammox sludge was more suitable being used as the inoculated sludge.Simultaneous removal of nitrogen and phosphorus from low C/N ratio wastewater was successfully achieved in a continuous flow reactor inoculated with Anammox sludge.In the stable operation stage,the removal rate of ammonium was approximately 40%-60%,of which 72%of the removed ammonium was converted to N2,and the removal rate of phosphate was about 40%.The formation of ferrous and the oxidation of ammonium indicated the existence of Feammox.Ferrous formed in Feammox induced the crystallization of vivianite,which indicated that vivianite crystallization was also a pathway for phosphate removal in addition to phosphate removal via ferric salts.