Adaptation, restoration and collapse of anammox process to La(III) stress: Performance, microbial community, metabolic function and network analysis. (April 2021) - Su, Hao
Graphical abstract: Highlights: La(III) in 1 mg/L significantly changes the composition of Anammox bacteria. La(III) has a significant inhibitory effect on Kuenenia . The blocking of key nitrogen metabolism pathways caused the breakdown of anammox. Lack of cooperation bacteria limits the activity of Anammoxoglobus . Denitrifying bacteria are promoted in 5–10 mg/L La(III) via the utilization of EPS. Abstract: During the mining of rare earth mineral, the use of lanthanum-containing fertilizers, and the disposal of lanthanum-containing electronic products, the content of lanthanum (La(III)) in typical ammonia wastewater with low carbon to nitrogen ratio is increasing day by day. Here, effects of La(III) on anammox process in performance, microbial community structure, metabolic function, and microbial co-occurrence network were investigated. The results shown that the nitrogen removal efficiency was declines briefly and then gradually recovers after low dosage (1–5 mg/L) La(III) treatment and the decrease to low level (24.25 ± 1.74%) under high La(III) dosage (10 mg/L). La(III) in the range of 1–5 mg/L significantly promoted the relative abundance of Anammoxoglobus (0.024% to 9.762%). The blocking of key metabolic pathways was confirmed to cause the breakdown of anammox by PICRUSt. Furthermore, network analysis revealed that lack of cooperation bacteria limits the activity of Anammoxoglobus .