Enhancement on the ammonia oxidation capacity of ammonia-oxidizing archaeon originated from wastewater: Utilizing low-de
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RESEARCH ARTICLE
Enhancement on the ammonia oxidation capacity of ammonia-oxidizing archaeon originated from wastewater: Utilizing low-density static magnetic field Zeshen Tian, Bo Wang, Yuyang Li, Bo Shen, Fengjuan Li, Xianghua Wen (✉) State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
HIGHLIGHTS
GRAPHIC ABSTRACT
• AOA’s ammonia oxidizing capacity was enhanced under moderate magnetic field. • AOA possessed a certain magnetotaxis under uneven magnetic field. • Enhanced ammonia oxidizing capacity was lost once magnetic field was removed.
ARTICLE INFO Article history:
Received 18 August 2020 Revised 22 October 2020 Accepted 22 October 2020 Available online 25 November 2020 Keywords: Ammonia-oxidizing archaeon Ammonia oxidation Magnetic field Magnetotaxis Heredity
ABSTRACT 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. © Higher Education Press 2020
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Introduction
Ammonia oxidation, considered as a rate-limiting step
✉ Corresponding author E-mail: [email protected]
during nitrification, plays an important role in the processes of global nitrogen cycle. For a long time, ammonia-oxidizing bacteria (AOB) had always been regarded as the unique ammonia oxidizing microflora until the first ammonia-oxidizing archaeon (AOA) (Nitrosopumilus maritimus SCM1) was isolated from an
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Front. Environ. Sci. Eng. 2021, 15(5): 81
oceanarium in 2005, followed by an increasing amount of attention from academic circles (Francis et al., 2005; Könneke et al., 2005). With the further research, some species of AOA have been discovered from various habitats of the earth, such as ocean (Beman et al., 2012), wetland (Sims et al., 2012; Chen et al., 2019)
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