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WR | Jufeng group of West Lake University revealed the impact of microplastics pollution on the flora and denitrification function of constructed wetlands
2022-07-05 17:12:00 【Liu Yongxin Adam】
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edit : Yang Xiangyu proofreading : Zhang Lu
tiny ( Na ) plastic , It refers to plastic particles with particle sizes ranging from tens of nanometers to a few millimeters 、 Thin film 、 debris 、 Pellets and textile fibers , It is dispersed in the environmental medium , It is often difficult to distinguish with the naked eye .2004 year , Published in Science Journal articles “Lost at Sea:Where Is All the Plastic?” The concept of microplastics was put forward for the first time .2014 year , The first United Nations Environment Conference pointed out that , To be sensitive to the environment ( Na ) Special attention is paid to plastics . stay 2015 At the second United Nations Environment Conference , tiny ( Na ) Plastic pollution has been listed as the second major scientific problem in the field of environmental and ecological science , Become associated with global climate change 、 Ozone depletion and other major global environmental problems .
Constructed wetlands (Constructed Wetlands) It is a sewage treatment system that simulates the water purification process of natural wetland , It has the function of landscape beautification . Microorganism is an important part of constructed wetland , The degradation and transformation of pollutants are mainly completed by microorganisms . Wetland systems are considered to intercept micro ( Na ) The ideal barrier for plastics to enter water —— tiny ( Na ) Plastics can be intercepted when they enter the constructed wetland with sewage , Reduce the pollution of downstream water ecosystem . But the long-term accumulated micro ( Na ) How will plastics affect microorganisms in constructed wetlands ? In micro ( Na ) Under the continuous influence of plastics , Whether the sewage treatment function of the constructed wetland will change ?
recently , Jufeng research group of West Lake University School of technology and Chen Yi research group of Chongqing University School of environment carried out cooperative research , The water purification system of the constructed wetland is simulated by a small-scale test device , focusing Denitrification process of wetland microbiome and system , The molecular ecology and bioinformatics methods, such as high-throughput sequencing and network analysis, were used to analyze In the wetland system , Different particle sizes and different concentrations of microcapsules ( Na ) The dynamic change of microbial community structure and the response of microbial nitrogen metabolism function during the accumulation of plastics . The result of this research was 5 month 19 It was published in the world's top journals in the field of environment 《Water Research》, The first author is a visiting student of West Lake University 、 Yangxiangyu, a doctoral student of the school of environment, Chongqing University, and Zhanglu, a doctoral student of West Lake University , The corresponding authors are professor Ju Feng from the school of engineering, West Lake University and Professor Chen Yi from the school of environment, Chongqing University .
Wetland system is an ideal barrier to intercept micro nano plastics from entering water
Constructed wetland is used as sewage treatment system or bank buffer zone , It is considered to be an important barrier to prevent pollutants from entering open waters . There are a large number of micro devices that actually exist in various environmental media ( Na ) plastic , It is continuously collected into the sewage system and surface runoff through sewage discharge and rainwater scouring , Finally, it will flow through the wetland system and enter the downstream water body after being intercepted and purified . The team of Professor Chen Yi of Chongqing University confirmed through preliminary research , The constructed wetland has good microplastics (96.7%-99.6%,DOI: 10.1016/j.watres.2022.118430) And nanoparticles (83.8%-86.6%,DOI: 10.1016/j.jhazmat.2019.121376) Intercept capability .
chart 1 Physical object and schematic diagram of constructed wetland experimental device
Ju Feng's scientific research team and Professor Chen Yi's team are at the time of setting up the inter school cooperation framework , We have jointly carried out a micro survey of the constructed wetland system ( Na ) During plastic accumulation , Nitrogen conversion 、 Research on response mechanism of microbial community dynamic succession and construction model , In order to improve the application of constructed wetland in water body ( Na ) Application potential of plastic pollution control .
Effect of micro nano plastic accumulation on nitrogen removal efficiency of wetland system
Nitrogen removal is an important water purification process in constructed wetlands , The nitrogen in sewage is mainly removed by functional microorganisms such as nitrification and denitrification , To prevent eutrophication of water body . The research team found that , In the short run / The accumulation of micron sized plastic particles can promote the nitrification process in the wetland system , But the long-term accumulation will have a negative impact , And the influence degree increases with the decrease of plastic particle size ; The accumulation of nano - sized plastics always inhibits the nitrification process in the wetland system . and For denitrification process , Milli / The accumulation of micron sized plastic particles is promoted , But nano plastics will inhibit the denitrification process , cause ( the ) Nitrate accumulation , However, it is interesting that this negative impact will gradually disappear after the wetland system adapts . In view of the above observed changes in wetland nitrogen removal efficiency , The research team further explored the response mechanism of wetland microbial community .
chart 2 Changes in nitrogen removal efficiency of constructed wetlands
Effect of micro nano plastic accumulation on wetland microbiome
Through to 300 During the days of experiment, it was found that , The microbial community structure changes with the increase of micro ( Na ) The accumulation of plastics . Overall , tiny ( Na ) The long-term accumulation of plastics in wetland system can lead to the decline of microbial richness and diversity . The size and concentration of plastic particles will affect the degree of interference to the biofilm microbial community , The influence of particle size factor is greater than that of concentration factor .
chart 3 Changes of microbial community diversity in wetland system
Based on the co-occurrence network analysis of microbial communities, it is found that , Under the conditions of plastic treatment from micron to nanometer , Microbial symbiosis model ( Especially species separation ) Not random , It is It is controlled by the particle size and concentration of plastic particles . tiny ( Na ) Plastics make the microbial co-occurrence network model of wetland system show “ Little world ” attribute ; At the same time, the co-occurrence degree of denitrifying microorganisms and other microorganisms increased , That is, they may interact more closely , It shows that the denitrification microorganisms in the wetland system are in micro ( Na ) Under the interference of plastic , It may adapt to its niche change through the change of interaction relationship .
chart 4 The co-occurrence network of denitrification microorganisms and other microorganisms in wetland system
By analyzing the dynamic succession law of bacterial community in wetland system , The research team found that nano plastics are effective against most nitrifying bacteria ( Such as Nitrospira and Nitrosomonas) Both showed significant inhibition , But it has no obvious effect on most denitrifying bacteria ; Most nitrifying bacteria in mm and micron plastic treatment groups ( Such as Nitrospira and Nitrosomonas) And denitrifying bacteria ( Such as Dechloromonas、Thauera and Zoogloea) The abundance showed an upward trend at the later stage of plastic accumulation .
chart 5 Dynamic succession of microorganisms in wetland system
Last , The research team is based on the microbial community 16S Ribosome RNA Gene composition predicts the function of nitrogen metabolism , Discovery of denitrifying enzyme gene (EC 1.7.2.1, EC1.7.2.5, EC1.7.2.4) It is significantly enriched in the treatment of micron sized plastics , this Again, it shows that the plastic with larger particle size may promote the denitrification process . Besides , The abundance of key enzyme genes in the process of nitrogen fixation and nitrite dissimilatory reduction to ammonia is reduced under the long-term accumulation of nano plastics .
chart 6 Prediction of microbial nitrogen metabolism function
The study lasted 300 God , Through a long time scale study, the efficiency and microbial community response of the simulated sewage treatment engineering system were analyzed comprehensively . The results It provides important evidence that plastic particles can change the sewage treatment efficiency of constructed wetlands , The response mechanism of microbial community behind it is deeply revealed , To manage and optimize micro ( Na ) The artificial wetland and other water treatment engineering systems under the influence of plastics provide important ideas .
Introduction to the research group and Recruitment Information
Environmental microbiomics studies all microorganisms in the environment and their genetic information , Its methodological basis and theoretical expansion and application are the international academic frontier and hotspot , Key scientific issues include :1) How to comprehensively, efficiently and quantitatively identify microbial communities ?2) How communities are constructed and determine function ? 3) How to accurately design and target control functions ? Laboratory of environmental microbiome and biotechnology, West Lake University (Environmental Microbiome and Biotechnology Laboratory, EMBLab) Research interests include :1) Environmental biotechnology and synthetic microbiomics ;2) Construction mechanism and functional principle of microbial community ;3) Formation mechanism and risk control of antibiotic resistance group ;4) New pollutants ( Plastics and drugs ) The mechanism of degradation and transformation and its health effects .
The laboratory is currently recruiting postdoctoral students 3 name : Plastic degradation 、 Waste water recycling 、 Microbiome 、 Virus group 、 Drug resistant group in either direction . Scientific research assistant : Microalgae water treatment 、 microbiology 、 Bioinformatics 、 New pollutants 、 Environmental Science DNA Direction , Welcome to contact us .
Contact email :
Introduction to the person in charge of the research group
Professor Ju Feng
Ju Feng , Researcher of West Lake University 、 Doctoral supervisor , Head of environmental microbiome and biotechnology laboratory , Deputy director of Zhejiang Key Laboratory of coastal zone environment and resources . At present, he is the Journal of Chinese Academy of engineering Engineering、Front Microbiol、Eng Life Sci etc. SCI Editorial board , as well as Crit Rev Environ Sci Technol、J Environ Sci、Environ Sci Ecotechnol、The Innovation、iMeta And so on . He served as the natural science and Engineering Council of Canada (NSERC) International review expert .2015 He received a doctorate in engineering from the University of Hong Kong ,2015-2018 At the Swiss Federal Institute of water science and Technology (EAWAG) Engaged in post doctoral research on microbial ecology and antibiotic resistance ,2018 Since, he has served as a distinguished researcher at West Lake University . It has won the Journal of Chinese Academy of engineering Engineering“ Editorial Board annual contribution award ”(2021)、 Chinese ecological society “ Shuiyuntian microbial ecology Youth Science and Technology Innovation Award - The grand prize ”(2018)、 Hong Kong Science Society “ Young Scientist Award ”(2016)、 The university of Hong Kong “ Outstanding graduate award ”(2015). In recent three years, he has presided over or participated in national or provincial scientific research projects 4 term ; At present, he is involved in compiling Chinese and English Monographs 4 Ben , stay ISME J、Adv Sci、Microbiome 、Environ Sci & Technol、Water Res And other well-known academic journals 50 Yu Wen , quote 3800 Remaining times .
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