Enrichment and characteristics of ammonia-oxidizing archaea in wastewater treatment process

HongyiChen, YangyangYue, WenbiaoJin, XuZhou, QilinWang, Shu-hongGao, Guo-junXie, SongDu, RenjieTu, SongfangHan, KexinGuo

Harbin Institute of Technology Shenzhen Graduate School, 518055 Shenzhen, China.

Abstract

High purity ammonia-oxidizing archaea (AOA) culture containing a single AOA strain was enriched from the filtering materials of biological aerated filter. The concentration of AOA reached 3.27 × 10⁷ copies/mL, while its proportion was 91.40%. The AOA amoA gene sequence belonged to Nitrososphaera cluster. Ammonia concentration significantly influenced the growth of AOA in culture, while total organic carbon (TOC) concentration had no obvious effect. The optimum ammonia concentration, temperature, pH and DO concentration for growth of AOA were 1 mM, 30 °C, 7.5 and 2.65 mg/L, respectively. Under the optimum growth conditions, the AOA abundance and ammonia oxidation rate were 3.53 × 10⁷  copies/mL and 2.54 × 10^-10  mg/(copies·d).

Graphical abstract

Keywords: Ammonia-oxidizing archaea (AOA),Biological aerated filter (BAF),EnrichmentGrowth conditions, Ammonia oxidation rate.