Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (2): 227-236.doi: 10.13560/j.cnki.biotech.bull.1985.2021-0470

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Research Progress of the Toxic Effects and Detoxification Measures of Engineered Nanoparticles in Biological Nitrogen-removing Process

ZHANG Man-man(), HE Teng-xia(), DING Chen-yu, CHEN Meng-ping, WU Qi-feng   

  1. Key laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education),Collaborative Innovation Center for Mountain Ecology & Agro-Bioengineering(CICMEAB),College of Life Sciences/Institute of Agro-bioengineering,Guizhou University,Guiyang 550025
  • Received:2021-04-11 Online:2022-02-26 Published:2022-03-09
  • Contact: HE Teng-xia E-mail:zhangmm815@163.com;txhe@gzu.edu.cn

Abstract:

Nitrogen compounds play an important role in the metabolism of life. However,excessive inorganic nitrogen may cause water deterioration and affect human health. Biological nitrogen-removing technology can efficiently remove inorganic nitrogen from the environment without causing secondary pollution. With the wide application of engineered nanoparticles in life,a large number of them have been released into the soil and water bodies,which greatly hinder the biological nitrogen-removing process in wastewater treatment process. Therefore,the toxic effect of engineered nanoparticles and the detoxification measures during microbial nitrogen-removing process have become the research hotspots in recent years. In this paper,the way of engineered nanoparticles entering water environment is described carefully. Thereafter,the impact of engineered nanoparticles on wastewater treatment systems and biological denitrification are systematically analyzed. Additionally,the toxic effects of engineered nanoparticles on denitrifying microorganisms and the detoxification mechanism of denitrifying microorganisms are carefully analyzed. The prospects for future research trends are proposed. It is aimed to have a theoretical significance for improving the biological nitrogen-removing efficiency in the presence of engineered nanoparticles. Meanwhile,it may promote the exploration of the toxicity and stress mechanism of nanoparticles to heterotrophic nitrification and aerobic denitrification bacteria.

Key words: engineered nanoparticles, biological denitrification, toxic effect, detoxification measures