Rare earth mine wastewater treatment via modified constructed rapid infiltration system: Nitrogen removal performance and microbial community

2021 ◽  
Vol 150 ◽  
pp. 223-232
Author(s):  
Jiacheng Sun ◽  
Chengyuan Su ◽  
Ying Xie ◽  
Zhi Huang ◽  
Jiayi Bao ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Rare Earth ◽  
Microbial Community ◽  
Nitrogen Removal ◽  
Mine Wastewater ◽  
Rare Earth Mine

scholarly journals Low-Temperature Adapted Nitrifying Microbial Communities of Finnish Wastewater Treatment Systems

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2450
Author(s):  
Antonina Kruglova ◽  
Jenni Kesulahti ◽  
Khoi Minh Le ◽  
Alejandro Gonzalez-Martinez ◽  
Anna Mikola ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Microbial Community ◽  
Low Temperature ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Full Scale ◽  
Cold Climate ◽  
Microbial Community Analysis ◽  
Operational Parameter ◽  
Climate Conditions

In this study, the microbial community of nitrifying activated sludge adapted to Finnish climate conditions was studied to clarify the microbial populations involved in low-temperature nitrification. Microbial community analysis of five full-scale wastewater treatment plants (WWTPs) showed several differences compared to WWTPs from other countries with a similar climate. In particular, very low abundance of ammonium oxidizing bacteria (AOBs) (altogether ˂ 0.25% of total community) as well as typical NOBs (˂0.35%) and a high abundance of orders Cytophagales and Micrococcales was observed in all Finnish WWTPs. To shed light on the importance of autotrophic and heterotrophic nitrifying processes, laboratory studies of activated sludge were carried out with a presence of and a lack of organic carbon in wastewater at 10 ± 1 °C. Two different sludge retention times (SRTs) were compared to determine the effect of this operational parameter on low-temperature nitrogen removal. The important role of previously reported Candidatus Nitrotogaarctica for nitrite oxidizing in cold climate conditions was confirmed in both full-scale and laboratory scale results. Additionally, potential participation of Dokdonella sp. and Flexibacter sp. in nitrogen removal at low-temperatures is proposed. Operation at SRT of 100 days demonstrated more stable and efficient nitrogen removal after a sharp temperature decrease compared to 14 days SRT.

Sign in / Sign up

Export Citation Format

Share Document