Enhancement on the ammonia oxidation capacity of ammonia-oxidizing archaeon originated from wastewater:Utilizing low-density static magnetic field  

作　　者：Zeshen Tian Bo Wang Yuyang Li Bo Shen Fengjuan Li Xianghua Wen 

机构地区：[1]State Key Joint Laboratory of Environmental Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing,100084,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第5期67-74,共8页环境科学与工程前沿（英文）

基　　金：the National Natural Science Foundation of China(Grant No.51678335);the China Postdoctoral Science Foundation(No.2015M57105).

摘　　要：Ammonia-oxidizing archaeon(AOA)could play important roles for nitrogen removal in the bioreactors under conditions such as low pH and low dissolved oxygen.Therefore,enhancing ammonia oxidation capability of AOA has great significance for water and wastewater treatment,especially under conditions like low dissolved oxygen concentration.Utilizing a novel AOA strain SAT1,which was enriched from a wastewater treatment plant by our group,the effect of magnetic field on AOA’s ammonia oxidation capability,its magnetotaxis and heredity were investigated in this study.Compared with control experiment,AOA’s maximum nitrite-N formation rate during the cultivation increased by 56.8%(0.65 mgN/(L·d))with 20 mT magnetic field.Also,it was testified that AOA possessed a certain magnetotaxis.However,results manifested that the enhancement of AOA’s ammonia oxidation capability was not heritable,that is,lost once the magnetic field was removed.Additionally,the possible mechanism of improving AOA’s ammonia oxidation capability by magnetic field was owing to the promotion of AOA single cells’growth and fission,rather than the enhancement of their ammonia oxidation rates.The results shed light on the application of AOA and methods to enhance AOA’s ammonia oxidation capability,especially in wastewater treatment processes under certain conditions.

关 键 词：Ammonia-oxidizing archaeon Ammonia oxidation Magnetic field Magnetotaxis HEREDITY 

分 类 号：X703[环境科学与工程—环境工程]